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  • 1
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 253-279 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Technique. This work is based not only on the fixed preparations, but also on fresh cover-slip preparations treated with neutral red or 2 per cent osmic acid for a short time.Golgi elements and fatty yolk. The Golgi elements are hollow vesicular bodies with a distinct osmiophilic rim and a central osmiophobic substance. In the youngest oocyte they form a circumnuclear ring. Gradually the vesicles spread out, grow in size, store up fat in their interior, and give rise to the fatty yolk. On account of their higher refractive index, due to the presence of fat, the Golgi vesicles can be occasionally seen even in the young oocytes without any treatment.Mitochondria. The mitochondrial granules also form a circumnuclear ring and are later distributed uniformly.Albuminous yolk. The albuminous yolk is nucleolar in origin. Early in oogenesis, the nucleous buds off small, homogeneous, and highly chromatic particles in the cytoplasm, which sooner or later disappear. Subsequently, the nucleolus becomes less chromatic and develops vacuolar bodies in its interior, which, becoming vacuolated exactly like the parent nucleolus, migrate into the the cytoplasm. These bodies become more and more chromatic and travel toward the periphery of the egg, where they grow in size. Ultimately they break down into small, homogeneous, and highly chromatic bodies which are the definitive albuminous yolk spheres and which subsequently grow enormously in size.
    Zusätzliches Material: 25 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Maturation of the male germ cells in the rat shows some slight modifications of the typical procedure in sex cells, a distinct and rather prolonged synapsis occurring before synizesis and a confused stage immediately after it. The clumping in synizesis is not extreme. In the mixed strain of rats both twenty-one and thirty-one tetrads appear in the late diakinesis. This procedure in the male resembles the maturation of the oocytes in only two points, the beginning of the process, the deutobroch nuclei, and the end of it when the haploid number of chromosomes take their places on the spindle.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 493-541 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The cells of the blastoderm which are to form the serosa are two- to four-nucleate; the smaller cells of the embryonic rudiment, uninucleate. The band-like embryonic rudiment encircles the yolk at the equator of the egg. The amnion does not begin to form until after the serosa completely covers embryo and yolk. The epithelium of the midgut arises from cells situated at the tips of stomodaeum and proctodaeum. These cells, though not differentiated from adjacent ectoderm at the time of the invagination, are nevertheless interpreted as part of the preprimordium of the endoderm. In the eighty-four-hour stage a fold of amnion grows over the dorsal side of the embryo, entirely covering it in the course of the next few hours. A portion of the amnion thus forms the dorsal wall of the embryo. At the completion of the amnion the embryo rotates so that its ventral side is directed toward the egg center. The amnion raptures just before the larva begins to feed on the yolk which still remains around it. The serosa is consumed before hatching, which takes place about five and one-half days after deposition.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 585-609 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The caeca of fourteen bantam fowls have been studied. These fowls ranged in age from six days' incubation to three years after hatching. Between the fifth and sixth days of incubation rectal caeca arise as evaginations from the intestine at the junction of the ileum with the colon. The develoing caeca closely resemble histologically the intestine to which they are attached.The caeca are essentially devoid of content until about the nineteenth day of incubation, but during the remaining days of incubation are gorged with a bluish-gray material similar to that found in the colon. Thus, an early defecatory function is indicated.In general, the proximal third of the caeca remains histologically similar to the intestine, but the distal two-thirds undergoes regression. The latter involves the atrophy of the epithelium and glands, accompanied by the appearance of lymphoid tissue. Much of the lymphoid tissue eventually disappears, to a large extent by atrophy and dissolution of the leukocytes. However, to some extent, lymphocytes develop into granulocytes which escape with other leukocytes into the lumina of the caeca and there disintegrate.Lymph nodules begin to appear in the caeca about one week after the chick hatches. The leukocytes, at least in part, arise in situ from the reticular stroma. Eosinophils arise in certain areas of the tunica propria, and in the earlier stages of their development resemble large lymphocytes, in the cytoplasm of which basophilic, amphophilic, and acidophilic granules are intermingled.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: In the ovary of the rat the ova arise by proliferations from the germinal epithelium, all cells of which are potential ova. This proliferation begins with the differentiation of the gonad, and may last as long as 369 days postpartum. The embryonic ovary is filled with ova which pass through the typical maturation phases. This continues until five days after parturition. These ova degenerate, none being found in the ovary of the twenty-day rat. After the fifth day postpartum, nuclear development in the ova changes until, by the twentieth day, no typical maturation phases are present. With the degeneration of the embryonic ova the ovary takes on the adult structure.The ovary of the adult female rat shows a modified type of meiosis in the germ cells, while that of the embryo shows the typical phases, indicating that this is the primitive type, with the modified form an acquired characteristic.Ova in a single rat may show both twenty-one and thirty-one chromosomes.Follicle cells are formed from the cells of the germinal epithelium and, like the sex cells, may have both forty-two and sixty-two chromosomes in a single follicle. The lutein cells also show both forty-two and sixty-two chromosomes in a single corpus luteum. The chromosomes of the lutein cells enlarge with the expansion of the cell to a size greatly in excess of the chromosomes of the somatic cells. The theca interna is derived from the tunica albuginea.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 89-133 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: During the telophases each chromosome becomes inclosed in an individual sac or vesicle which, together with its contents, is called a chromosomal vesicle. The vesicular membrane is of cytoplasmic origin, but is formed under the influence of the chromosome and a droplet of karyolymph. A precise numerical correspondence between chromosomes and chromosomal vesicles has not been established, but it is evidence that most, if not all, of the chromosomal vesicles retain their individuality during the resting stage and until after the new chromosomes have been fully formed.The transformation of the telophase chromosome into the reticulum of the resting stage and the manner in which a new chromosome is formed from a portion of this reticulum are described in detail. In the early prophases each developing chromosome is embedded in a sheath or matrix of less deeply basophilic material, which disappears before the middle prophase is reached.The formation of chromosomal vesicles is interpreted as a device for doing more rapidly and effectively, under stress of special circumstances, the work that the nucleus must accomplish during the so-called resting stage.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929) 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 283-333 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The significance of the ultimobranchial body has been the object of a comparative study of the structure in twenty-four species of urodeles. In nineteen of these it has not hitherto been described.Caudal to the last branchial arch, it develops as a thickening and later as an outpushing from the ventral wall of the pharynx. Due to the growth mechanics of the region, it comes to lie obliquely to the pharynx, ventral to it, and dorsal or dorsolateral to the pericardial cavity in its anterior region. It persists throughout life as an epithelioid or epithelial structure, usually of irregular shape, frequently containing vesicles; in some cases it exhibits a considerable amount of secretory activity of variable quality. Except in Amphiuma and Necturus, where it is regularly paired, and in occasional instances in individuals of other species, where it occurs on both sides, it is usually present on the left side only. Its occurrence is constant in all of the species of urodeles for which it has been examined.It is variable in size, form, and position. This, together with the quite inconstant indication of secretory activity, marks it as a structure of little or no physiological significance. ‘Colloid’ is, however, present in some instances, and hence a comparison with the thyroid was considered.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 435-478 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The perivisceral fluid of Pheretima indica (Horst) contains five types of leucocytes: lymphocytes, monocytes, granulocytes, lamprocytes, and linocytes. The granulocytes differentiate either from free lymphocytes, from peritoneal epithelial cells lining the leucocytopoietic organs, or from lymphocytes (hemocytoblasts) embedded in these organs. The lymphocyte is a hemocytoblast. The eosinophilic granulocyte is the most numerous of the several types of granulocytes. Morphologically and tinctorially, it resembles the eosinophil of fishes. The eosinophil granule is thought to arise either by a ripening of a basophil granule and to pass through a metachromatic phase during this process, or by being formed immediately without such a ripening process in small hemocytoblasts. The stimulus for the excessive production of eosinophils is thought to be the degree of infection of the leucocytopoietic organs by a species of the gregarine, Monocystis.A series of segmentally arranged leucocytopoietic organs is described for the first time in the oligochaetes. These organs are essentially foldings of the septa and offer sacculations in which leucocytopoiesis may take place.A discussion of the possible phylogeny of the hemocytopoietic organs of the invertebrates and vertebrates is given.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 555-587 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The germ cells of Lebistes are found in cysts; the younger cysts are toward the cortex. Mitochondria and Golgi apparatus are present. During maturation leptotene, bouquet, pachytene, and diakinesis figures are seen. The spermatocyte chromosomes number twenty-three; an X-Y pair is probably present, though the evidence is not conclusive. In spermatid formation the centriole divides to form a rodlet and an axial filament; the nucleus segregates into two materials, one of which is extruded; the remainder first contracts to a cup, comes in contact with the rodlet, then again forms a sphere. The mitochondria are arranged along the proximal part of the axial filament; the sphere flattens and elongates; the rodlet sinks into the head substance and is enfolded by it. The Golgi remnant is sloughed off with the residual cytoplasm, which disappears at the same time the Sertoli cells show an increase in size, suggesting their ingestion of the spermatid remnants. The mature sperm form spermatozeugmen, which are stored in the testicular canal; they are transferred to the female by aid of the modified anal fin.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 11
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 81-103 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: A comparative study of the embryology of the rabbit in races of large and small adult size shows a consistently more rapid rate of cell multiplication and of increase in mass in large-race embryos than in those of small race.This more rapid rate of growth is transm tted by and influenced equally by sperm and egg cell, as is shown by the results of reciprocal crosses.Rate of differentiation is independent of rate of growth and unaffected by it. Consequently, embryos of the large race have attained greater size than those of the small race at corresponding stage of differentiation.The fundamental difference in rate of growth is already in evidence in forty-eight-hour embryos and becomes increasingly clear at later stages. Embryos produced by the large race have undergone about one more cell division at forty-eight hours after mating and so are approximately in the thirty-two-cell stage when embryos of the small race are in the sixteen-cell stage.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 12
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 135-199 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Definite information concerning the time of development and location of the different imaginal discs of Drosophila melanogaster was needed in order to interpret especially the gynandromorphs, mosaics, and intersexes that have been extensively reported in cultures of this fly. This information was also desirable for many of the mutant types. It was not known, for example, when an organ was reduced or absent, whether its imaginal disc showed a corresponding reduction, or whether it was full size in the larvae and pupae, and failed to carry through to the later stages.Three mutant types with eyes smaller than those of the wild type, namely, lozenge, bar, and eyeless, were examined. It was found that there is a corresponding difference in size as far back as the imaginal disc could be detected. Similarly for the two mutants, vestigial and no-wing. Conversely for the mutant, bithorax, in which the metathorax is larger than the normal and has assumed many of the characters of the normal mesothorax, the imaginal disc was correspondingly enlarged.It follows that the effects of the mutant genes for these characters can be observed in the very earliest condition of the imaginal disc.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 13
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 45-79 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: It was found that thyroid deficiency in the albino rat (Mus norvegicus albinus) is followed by a trend to increased concentration of epinephrin in the suprarenals. The basis of this lies in the relatively greater retrogression of the cortex as contrasted with the medulla which becomes a relatively greater proportion of the organ as a whole. Confirmatory evidence is found in cell counts per unit area and the part of the disappearance of lipoid from the cortical cells of the suprarenals of thyroidless animals.
    Zusätzliches Material: 5 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 14
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 123-151 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: From a study of over 1000 mothers, the female chromosome number appears to be 2N = 22; N = 11. The male number has not been exactly determined, but is presumably not haploid. Only one maturation division occurs in the parthenogenetic egg, and the authors have seen only one in the sexual egg. During the growth stages of the eggs, the chromatin is totally obscured by a large amount of deeply staining nucleolar material which exhibits several phases. Ultimately, this material is apparently absorbed into the ooplasm. Just before the egg is laid, the ovoid chromosomes, in late prophase or in metaphase, are seen in a germinal vesicle situated always at one side of the egg. The maturation division occurs immediately after egg laying. A degenerate body, hitherto undescribed, is noted in the ripe parthenogenetic egg, situated at the pole opposite the germinal vesicle. It is believed to arise by reorganization of nucleolar substance. The body in the sexual egg desribed by Weismann and Ishikawa ('91) as the Paracopulationzelle is noted and its interpretation by these authors questioned, but, for lack of sufficient evidence, no counter-explanation is offered. The possible relation between experimental sex control and the time of maturation division in the parathenogenetic egg is discussed.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 15
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 37-87 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The vesicular nucleus of this amoeboflagellate is similar in structure in both phases of its life-cycle. It has a fairly large caryosome surrounded by a pericaryosomal area in which there are small oxyphilic pericaryosomal granules on a fine reticulum. On the inner surface of the definite caryotheca is a layer of epithecal chromatic granules.Nuclear division is similar in both amoeba and flagellate phases. During the prophase the nucleus enlarges, and the expanded caryosome becomes resolved into basophilic and oxyphilic components and assumes either an oblong, dumb-bell, or spindle shape. The pericaryosomal granules enlarge, shift about, and eventually become arranged in an equatorial band around the elongated caryosome. In the metaphase the equatorial plate of chromosomes appears after the inward migration of the pericaryosomal granules, accompanied by the formation of a definite intranuclear spindle, usually with polar masses, polar granules, and a centrodesmose. After the poleward migration of the daughter plates of chromosomes in the anaphase, the telophase constriction of the nuclear membrane produces two daughter nuclei with a portion of the spindle remaining outside. The epithecal layer of granules remains in place on the nuclear membrane during the entire process of mitosis. Plasmotomy normally follows mitosis, but may be delayed, giving rise to multinucleate individuals. In the flagellate the blepharoplast usually divides simultaneously with, but independently of, the nucleus. There are many divergences in the details of mitosis, but these are thought to be variations of one type of division rather than examples of different processes.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 16
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 261-281 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: In sections the protoplasm of the spinning gland of Platyphylax designatus Walker appears to be a syncytium with large, branching nuclei, which contain both nucleoli and chromatin granules embedded in a delicate linin reticulum.In the normal gland the nucleus is sharply marked off by a nuclear membrane from the granular, homogeneous cytoplasm. The Golgi apparatus appears as rings, loops, or comma-like structures, evenly distributed and without orientation to the nucleus or lumen of the gland.The nucleoli first increase both in number and size within the nucleus, then migrate out into the cytoplasm, where they undergo further growth, and finally are dissolved and passed out into the lumen of the gland as liquid secretion.Small vacuoles appear near the periphery of the gland in early periods of activity.In glands active for forty-eight hours all stages of the secretory process may be seen.In glands active for longer periods only vacuoles are present which we interpret as the remains of the secretory inclusions. There is a progressive decrease in the nuclear content of the nucleus.Throughout the activity of the gland the Golgi apparatus changes little from the normal condition, both in form and distribution. As activity progresses, the bodies become smaller and slightly more dispersed. No relation of Golgi apparatus to the secretory phenomenon is apparent.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 17
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 415-433 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The diploid number of twenty-six chromosomes was found in the mature parthenogenetic female-producing eggs and also in the somatic cells of the female embryos developing from such eggs. In the maturation stages of a few of these eggs the chromosomes were markedly larger than in the corresponding stages of the majority of the eggs. Whether this size difference of the chromosomes is correlated with male- and female-producing individuals has not been determined. The mature parthenogenetic male-producing eggs contain the haploid number of thirteen chromosomes, and this number was found also in the somatic cells of the young male embryos. The mature sexual eggs contain thirteen chromosomes.In spermatogenesis the secondary spermatocyte divisions are usually omitted and the secondary spermatocytes develop directly into the motile spermatozoa containing thirteen chromosomes. A few, however, of the secondary spermatocytes divide, forming spermatids containing fewer than thirteen chromosomes. These cells develop into the non-motile and rudimentary spermatozoa.The motile spermatozoa containing thirteen chromosomes unite with the parthenogenetic male-producing eggs containing thirteen chromosomes, thus producing the fertilized eggs with the diploid number of twenty-six chromosomes. These fertilized eggs develop into female-producing females which reproduce parthenogenetically.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 18
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 519-529 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The liver has a rhythmic function with alternating assimilatory and secretory stages. The height of the assimilatory stage in rabbit's liver is characterized by the following qualities: All the cells are usually expanded and contain much glycogen and few bile components. The bile capillaries are narrow and generally empty. The glycogen content is high (about 13 per cent); the total glycogen weight is also high (about 17 grams). The liver has a relatively heavy weight (about 140 grams), a large volume, notably firm consistency, and a light brown color.The secretory stage at its height has the following characteristics: All cells are shrunken and are rich in bile components, but contain little glycogen. The bile capillaries are expanded and filled with secretion (fixation with barium chloride). The glycogen content is low (about 1 per cent), and the total glycogen weight is also low (about 1/2 gram). Weight of liver low (about 50 grams). Volume small and consistency fairly flaccid. Color dark reddish brown.Between these two extremes are various intermediary stages. Such variations as these probably occur during the normal functioning of the liver in man and also in other animals.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 19
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 1-43 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The parenchymal cells in the parathyroids of Rana catesbeiana (Shaw) are found to undergo a very curious cyclic change. The cytoplasm is broken down by a process of cytolysis. The nuclei are decomposed by chromatolysis and pycnosis. The entire parenchyma is finally liquefied, except for a layer of cells lining the capsule.The parathyroid body is reconstructed by young cells which are produced from rather definite growth centers. The process of regeneration begins some time before cytolysis is completed and continues until the entire organ is restored.The cytolytic and regenerative processes transpire in such sequence that the amount of apparently healthy tissue present at any one time is a rather large portion of the total mass normally present.The relationship between the parenchymal tissue and the stroma of the parathyroid is described.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 20
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 153-171 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: A description of the gross embryology of the sex apparatus of a common diplopod, the corn millipede. The life-cycle of this animal involves eleven instars extending over a period of three years.In the male the true first legs are shed at the ninth ecdysis and the large clasping appendages are substituted through the last three instars. In the region of the second body somite the fused coxal plate and the penes are developed at the final molt; the second appendages are reduced at this time. The greatest changes occur in the region of the seventh somite, where the legs are shed about the eighth ecdysis and the gonopods developed through the remaining instars. It is evident that these gonopods arise as a modification of the sternites of the seventh somite.In the female the second legs are reduced to vestiges at the final molt. The structures at the mouth of the oviducts are developed from the surrounding tissues and the modified sternites of the reduced second legs. These changes are in progress as early as the seventh instar, but the greatest changes occur at the final ecdysis.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 21
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 281-316 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The arterial system of Uromastix hardwickii retains many primitive features and shows great resemblance and relationship to that of Sphenodon. The heart is typically reptilian. Two systemics and a pulmonary arch arise from the ventricle. The conus arteriosus is absent. The carotids arise together from the right systemic by means of a small common carotis primaria. A very well-developed ductus caroticus connects each carotid with the systemic arch of its side. The ductus arteriosus (ductus Botalli) is absent.The dorsal aorta is formed by the union of both the systemic arches. The left systemic joins entire while the right one, which is termed systemicocarotid trunk, gives off the carotids, the vertebral, a single subclavian, and two pairs of parietal arteries, before the union. Anterior epigastric arteries are altogether absent. The dorsal aorta gives off fifteen pairs of parietal arteries which are segmentally arranged. All the main branches supplying the alimentary canal and other viscerala organs arise independently of one another, there being no such combination as is found in Varanus.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 22
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 371-383 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The rate of locomotion in Amoeba proteus is dependent upon the nature of the substratum, the nature of the different divalent and monovalent cations present, and the ratio of the amount of the monovalent cations to the amount of calcium or strontium. Calcium is more efficient than strontium in antagonizing potassium. Magnesium and barium do not antagonize potassium. The four monovalent cations studied in antagonizing calcium are efficient in the following order: Na〉K〉Li〉Rb. Calcium and potassium are more effective against antagonistic cations when combined with chlorine than when combined with phosphate.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 23
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 543-561 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The parietal fossa or pit is situated in the middorsal line between the ear capsules. From its floor four (sometimes only two) apertures lead into the ear capsules. The anterior apertures are the foramina of the endolymphatic ducts; the posterior ones are the fenestrae. Through the fossa each endolymphatic duct passes from its formen to its external aperture in the dorsal integument, describing in its course a loop with the convexity directed anteriorly. The part of the duct involving the loop is enlarged into an endolymphatic pouch. Into the angle of this loop a small muscle is inserted which is a continuation of the anterior trunk muscles, or one taking a more lateral origin from the edge of the fossa. The fenestra may or may not be closed by a definite fenestral membrane. The posterior semicircular canal (posterior utriculus) bears a peculiar relation to the fenestra. The endolymphatic pouch, like the sacculus, contains otoconia, and sometimes siliceous sand grains. Various functions have been assigned to the endolymphatic organ. There is no convincing experimental evidence as to its significance.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 24
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 611-625 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: By the use of a new technique it was possible to demonstrate the Golgi granules about the idiosome of spermatids and in the so-called Golgi bead of the mature spermatozoon. Other osmiophile granules in the cytoplasm, assumed to be Golgi granules, aggregate during metamorphosis into groups which formed neutral fat spheres, giving stains with both sudan III and scharlach R. Evidence is adduced supporting the view that the Golgi apparatus is a lipin and probably a phospholipin. The fat spheres produced are probably a result of fatty degeneration in the residual body of the spermatid. They may also serve as the source of lipin in Popa's ‘Lipo-gel’ phenomenon.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 25
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929) 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 26
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 345-369 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The specimen described presents a typical intersexual condition, in which not only the primary sex characters, but also the accessory sex organs and the secondary sex characters are of a mixed type. Both gonads are ovotestes, in which the ovarian as well as the testicular tissues are morphologically normal, but functionally underdeveloped. Stromal hyperplasia is distinct, especially so in the left gonad; it is probably a functional factor in the generative process of the spermatic tissue.Sex transformation in the intersexual frogs may probably be initiated by an abnormality in sex differentiation or in the genetical constitution of sex, and is only subsequently influenced and modified by environmental action. Absolute dominancy of male sex in the process of sex transformation is questionable. There are indications that in frogs sex transformation may possibly occur in a female direction.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 27
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Following the isolation of sperm in the epididymides of male guinea-pigs by the separation of this organ from the testis, the animals were found to remain fertile for periods varying from twenty to thirty-five days, whether they were allowed to mate but once during this period, or five times during the period, or twenty times during the period. Motile sperm were found as long as fifty-nine days after the operation. It was concluded, on the basis of these data, that an aging process which sperm isolated in the epididymis undergo is more important than the number of matings (up to at least nine or ten) in the determination of the period during which sperm motility is retained and in the determination of the period during which fertilizing capacity is retained.If the behavior of sperm isolated in the epididymides can be taken as an indication of the processes of sperm development which occur normally, the epididymis would seem to be an organ in which sperm may at one time be attaining an optimal functional state and may at another time be aging and becoming incapable of functioning. The possible significance of this suggestion for the rǒle of the epididymis in sperm development and for the history of sperm after they leave the testis is discussed.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 28
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 563-584 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: From the structure of statocysts, in the so-called phylogenetic tree of the Cephalopoda, the genus Scaeurgus is to be placed on the same branch as Polypus.Meleagroteuthis has the same number of processes as Watasenia, Enoploteuthis, Abralia, Illex, and Stigmatoteuthis, which have ten processes, but in this genus the structure of statocysts seems to be tolerably well developed. For this reason, the author places this genus as a branch between Abralia and Illex.Those three genera - Gonatus, Sthenoteuthis, and Onychoteuthis - which have eleven processes in a statocyst are to be placed in the same branch as Berryteuthis, Gonatopsis, Ommastrephes, Eucleoteuthis, Moroteuthis, and Symplectoteuthis, which have the same number of processes; of these, Gonatus, which has the most primitive structure of the statocyst, is to be put in the lowest position on that branch; but Sthenoteuthis, which has the same structure of the organ as Ommastrephes, is to be placed on the twig near Ommastrephes; and, lastly, Onychoteuthis has the same organ as that of Moroteuthis, which fact induces the author to set this genus in the position nearest to Moroteuthis.The statocyst of Lolliguncula corresponds exactly to that of Loligo, which has twelve processes; this condition puts this genus on the same twig as Loligo.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 29
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 201-225 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: There are eleven pairs of chromosomes in the somatic cells of the opossum.The sex chromosomes are of the x-x type in the female and the x-y type in the male.The number and type of the chromosomes are constant in the wide variety of tissues and organs studied, except that one dividing giant cell of the spleen showed an 8n number of chromosomes.The arrangement of the chromosomes in equatorial plates is that of an autosomal ring surrounding the centrally located sex chromosomes.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 30
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 497-517 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: This study concerns the voice box or syrinx of the fowl in its possible relation to sex. Although neither hens nor capons crow, ovariotomized hens have been known to do so. It appears that a slight sexual dimporphism exists in the syrinx of certain fowls, and it was thought that a particular form might be essential to the act of crowing. However, no sexual dimorphism is apparent in the syrinx of the Brown Leghorn fowl.The syringeal structures of crowing birds (cocks and ovariotomized females) contain no features which cannot be demonstrated in normal females. Variations were found in the syrinx in this breed and in other breeds, but they had nothing to do with sex. There is a gradual ossification with increasing age and size. It may be concluded that there is no apparent reason why the female fowl should not crow, provided it had the instinct to do so properly developed. The sex hormones, if they act in voice production, must act entirely through the conditioning of the central nervous system.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 31
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 531-553 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The external genitalia and the internal reproductive organs are described. Compound gonads, with a normal development of testicular and ovarian tissues, are found in the positions of the gonads of normal individuals. The genital ducts arise in both types of tissue and serve as common ducts.It is demonstrated microscopically that the male tissue has one and the female tissue two sex chromosomes. The diploid number (or nearly so) is present in both tissues. This is the constitution of the normal sexes.The origin of the gynandromorphs is accounted for by assuming either the theory of dispermy in the binucleated egg or chromosomal elimination.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 32
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929) 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 33
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 1-36 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The first spermatocytes of Circotettix verruculatus have eleven chromosomes. Five of these are regularly atelomitic and three are telomitic. The other three are variable and may have both diads telomitic, both atelomitic, or one diad telomitic while the other is atelomitic. The locus of fiber attachment and, consequently, the form of the chromosome are constant for the individual. The point of fiber insertion is known to be inherited according to mendelian principles, and is, therefore, a measure of the frequencies of the telomitic and atelomitic diads in a group of individuals.Samples of five geographically different populations were studied with respect to the proportion of atelomitic to telomitic diads in the three variable tetrads. The proportion for each of the three chromosomes was compared with that for the corresponding tetrads from the other localities. The data were subjected to statistical analysis, and significant differences between some of the groups were found in the proportion of atelomitic to telomitic diads in corresponding chromosomes.A possible correlation between these cytological differences among the various localities and the formation of geographical races or subspecies are discussed. An inversion of the portion of a chromosome, which causes an apparent, although not a real, change in the locus of fiber attachment, is suggested as the origin of atelomitic chromosomes. The effect which heteromorphism of synaptic mates may have on crossing-over is considered.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 34
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 227-259 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: A histological study was made in the guinea-pig of the distribution of melanin pigment in the normal dark-eye and in various mutant types, such as the brown type of dark-eye (b), light and dark salmon-eye (sm), dark red-eye (crB), brown red-eye (crb), albino (ca), pink-eye (p), and pseudopink-eye (P sm b). The genes which affect pigmentation in the eye have definite qualitative or quantitative effects on the production of melanin. Eyes of the genetic constitution ca, p, or sm possess very little pigment. But eyes which have the dominant allelomorphs of these genes, C, P, or Sm, have a large amount of pigment. The non-yellow gene, cr, and the brown gene, b, cause the deeper retinal layer, which is normally intensely pigmented throughout its entirety, to become less pigmented. There is a corresponding reduction in the melanin in the pigmented areas of the iris and choroid. In all types of eyes with reduced pigment, such as the albino, pink-eye, and pseudopink-eye, pigment persists in the deeper retinal layer even when it is almost absent from other regions. Moreover, in all eyes which have less pigment than the normal type there is a decided tendency for chromatophores to be located adjacent to blood vessels. This tendency is outstanding in the iris and quite noticeable in the choroid.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 35
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 47 (1929), S. 335-413 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: An attempt is made to define lips, and on Danforth's interpretation of homology, homologous lips are found at certain stages of development in some representatives of all classes of vertebrates. The primary lips characteristic of selachians, after the maxillary and premaxillary bones have developed within the territory of the upper lip (toadfish, cod), may disappear (trout, Spelerpes), accompanied by a forward migration of the lower jaw. The secondary lips of higher forms are first indicated in certain teleosts and amphibians. Lips vary in structure to accord with their physiological functions, whether sensory, prehensile, or adhesive. Lips of the cod are highly sensory; those of the tadpole and of grazing animals, in different ways, are notably prehensile; the lips of petromyzon and the vampire, having abundant villi, are most effectively adhesive. Therefore, the smaller villi of the lips of suckling animals are presumably for tight adhesion to the nipple. The opossum and rat, however, nurse before their lips have developed. No free macroscopic villi are found on human lips, but there is a zone of thick epithelium tending to form villi. Such a zone is shown to be a widespread feature of vertebrate lips.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 36
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: During the past few years many functions have been assigned to the epididymis which have been supplementary to its rǒle in sperm storage and to its secretory activity. One of these, the suggestion that sperm attain full maturity and are strengthened in consequence of some action of its secretion, has been reinvestigated as the first part of a study which is intended to include other aspects of the problem.No evidence in support of the theory was obtained from a series of experiments on various mammals representing a repetition and extension of earlier work. On the contrary, the strengthening and attainment of full spermatozoon maturity would seem to be the outcome of changes which are inherent in the sperm themselves. It is suggested, therefore, until other aspects of the subject can be reinvestigated, that the epididymis is simply a reservoir for sperm in which the processes of sperm development which start while they are still contained in the testis are free to continue because of the favorable environment present in the epididymis.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 37
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929) 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 38
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 105-121 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Two types of cytoplasmic inclusions, differing in reactions to vital dyes and to osmic fixation and impregnation have been demonstrated in Peranema trichophorum. The mitochondria are rod-like and lie in more or less spiral rows, forming a single layer beneath the periplast. They are stained supravitally with Janus green, but not with neutral red. They may be demonstrated by staining in iron hematoxylin after Mann-Kopsch fixation. They are also blackened in prolonged osmic impregnation, but are bleached readily with hydrogen peroxide.The small spherical osmiophilic inclusions are scattered in distribution, although sometimes more numerous in the anterior third of the organism. These bodies are stainable supravitally with neutral red, neutral violet, and brilliant cresyl blue. They are densely blackened in osmic impregnation, and are not bleached in the usual treatment with hydrogen peroxide. They are not however, demonstrated by Mann-Kopsch fixation and iron hematoxylin. After being stained supravitally with neutral red, these inclusions may be blackened under direct observation by exposure to osmic vapor in hanging-drop preparations.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 39
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 173-251 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The purpose of this study was to determine whether structural elements of the cytoplasm can be demonstrated to be specifically concerned with certain physiological processes that are experimentally induced in tissue at the time of fixation. The methods for bringing into view variations in cell structure correlated with cell activity were as follows: the increase of the process of secretion by subcutaneous injection into the living animal of phenol red and of urea; the increase of the process of reabsorption by injection of glucose: the inhibition of reabsorption of sugar by injection of phlorhizin.Variations of the same magnitude in the form, position, quantity, and interrelationships of granules, globules, chondriosomes, and Golgi substance were found to occur in normal untreated animals and in those treated experimentally. Some evidence was found that in cells of the proximal tubule a characteristic form of Golgi body appears which seems to be correlated with increased reabsorption of sugar.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 40
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: A histological study has been made of a series of Phrynosoma testes taken at frequent intervals throughout the year. As it was important to differentiate between the amount of interstitial tissue and the number of cells, it was necessary to take into account the percentage of tissue, total testis volume and the number of cells per unit volume.The results show a definite interstitial-cell cycle. Volume of interstitial tissue and size of individual cells are greatest during the breeding season, but the interstitial-cell number is then minimal. The maximal number of interstitial cells occurs after the close of the breeding season. There is, apparently, no reversion of interstitial cells to a connective-tissue-cell type.The above changes are correlated with the spermatogenetic cycle and with increases in total tubule length, in tubule diameter, and in testis volume. The time in which important changes in ovarian volume occur and at which ovulation takes place is coincident with the testicular changes.Interstitial cells have been stated to have no endocrine function for the reason that their number is at a minimum during the breeding season. If, however, interstitial tissue is responsible for sex characters and activity, the present work would indicate that it is the volume of tissue, and not the number of cells, that is important.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 41
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 48 (1929), S. 385-431 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Direction of peristalsis of the dorsal vessel in prepupa, chrysalis, and adult of Lepidoptera is not constantly forward; phases of forward peristalsis alternate with phases either of backward peristalsis throughout the whole dorsal vessel or of diverging waves originating in the third to fourth abdominal segments, proceeding backward and forward. Periodic reversal in the silkworm begins twenty-four hours after spinning, forty-eight before pupation. Pupation occurs during a vigorous backward phase. Soon after pupation, and sometimes during pupation, backward phases consist of diverging waves. Later, and in the adult, complete reversal intermittently occurs. Backward phases in the pupa are long (e.g., fifteen minutes), the average rate slow and variable, quickening at eight to ten days to that of the adult. Any long backward phase shows a gradual slowing down, except approaching pupation when the pulse quickens to equal that of forward beating. Average rate of forward beating is constant at constant temperature, but absolute rate in a long phase gradually slackens. Pauses (sometimes one and one-half hours long in older pupae) often follow forward phases. Alternating phases in the adult, compared with the pupa, are short, about one minute and usually less than one hundred beats. In old moths the phases become still shorter, often being reduced to single beats. Opposing waves occasionally conflict. Periodic reversal occurs for hours after excision of the dorsal wall with the pericardium and heart. As in ascidians, back pressure cannot explain reversal.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 42
    facet.materialart.
    Unbekannt
    In:  Natur und Museum, Milano, Gustav Fischer, vol. 59, no. 3, pp. 477-487, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publikationsdatum: 1929
    Schlagwort(e): Tectonics ; Earth model, also for more shallow analyses !
    Standort Signatur Erwartet Verfügbarkeit
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  • 43
    Publikationsdatum: 1929
    Beschreibung: vgl. Neustädt KATASTER-BESCHREIBUNG: Zusammenhang Witterungsfaktoren in wachstumsrelevanten Zeitspannen mit dem Ertrag verschiedener Kulturen KATASTER-DETAIL: Delta Nied (Oktober bis März) -, dann Erträge (Roggen) +; Delta Nied (Januar) -, dann Erträge (Roggen) ++; Delta Nied (Februar) +, dann Erträge (Roggen) +; Delta Nied (Mai) +, dann Erträge (Roggen) +; Delta Nied (Mai) 〉 1,5x Mittel, dann Erträge -; Delta Sonn (Mai, im Bezirk Köthen) +, dann Erträge (Roggen) -; Delta Nied (Januar, März, April) -, dann Erträge (Sommergerste) +; Delta Nied (Februar, Mai bis Ernte) +, dann Erträge (Sommergerste) +; Delta Nied (Mai) +, dann Erträge (Sommergerste) ++; (Informationen zu den weiteren landwirtschaftlicher Kulturpflanzen: siehe Artikel)
    Schlagwort(e): Mitteldeutschland ; 1900-1926 ; Kartoffeln ; Ertrag ; Niederschlag ; Roggen ; Temperatur ; Witterung ; Hackfrüchte
    Standort Signatur Erwartet Verfügbarkeit
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  • 44
    facet.materialart.
    Unbekannt
    In:  Global Change Biology (2013) 19, 1736–1747
    Publikationsdatum: 2013
    Beschreibung: Abschätzungen über zukünfige Bedeutung ökonomisch relevanter pilzerkrankungen in Raps, (Verticillium longisporum, Sclerotinia sclerotiorum und Leptosphaeria maculans) KATASTER-BESCHREIBUNG: Ableitung des Auftretens von pilzlichen Pathogenen aus Klimakammerversuchen , Berechnung von Temperatursummenmethoden KATASTER-DETAIL: Delta T (+ 2°K), dann Keimung von Sclerotinia etwa 1 Woche früher, Auftreten der Sporen von Verticillium etwa 7-9 Tage früher
    Schlagwort(e): Klimakammerversuche, Niedersachen ; 2011-12 ; 2051-2100 ; Infektionskrankheiten ; Pflanzenkrankheit ; Raps
    Standort Signatur Erwartet Verfügbarkeit
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  • 45
    facet.materialart.
    Unbekannt
    In:  Arb. der Biol. Reichsanstalt Land. und Forstwissenschaft 17:423-434.
    Publikationsdatum: 1929
    Beschreibung: Zusammenhang zwischen Temperatur, Sonnenscheindauer und Niederschlag und die Auswirkungen auf Parasiten im Obstbau KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Schlagwort(e): Niederelbe ; 1896-1928 ; Niederschlag ; Pflanzenkrankheit ; Pflanzenschädling ; Temperatur ; Obst ; Parasit
    Standort Signatur Erwartet Verfügbarkeit
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  • 46
    facet.materialart.
    Unbekannt
    In:  Deutsche Landwirtschaftliche Presse, 56. Jahrgang, Nr. 37, p. 528-529
    Publikationsdatum: 1929
    Beschreibung: Allgemeine Beobachtungen zum Verlauf der Krankheit sowie Beschreibung des Schadbildes KATASTER-BESCHREIBUNG: - KATASTER-DETAIL: -
    Schlagwort(e): Kempen, Nordrhein-Westfalen ; 1929 ; Ertrag ; Hafer ; Pflanzenkrankheit
    Standort Signatur Erwartet Verfügbarkeit
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  • 47
    Publikationsdatum: 2013-12-10
    Beschreibung: Evolution drives, and is driven by, demography. A genotype moulds its phenotype's age patterns of mortality and fertility in an environment; these two patterns in turn determine the genotype's fitness in that environment. Hence, to understand the evolution of ageing, age patterns of mortality and reproduction need to be compared for species across the tree of life. However, few studies have done so and only for a limited range of taxa. Here we contrast standardized patterns over age for 11 mammals, 12 other vertebrates, 10 invertebrates, 12 vascular plants and a green alga. Although it has been predicted that evolution should inevitably lead to increasing mortality and declining fertility with age after maturity, there is great variation among these species, including increasing, constant, decreasing, humped and bowed trajectories for both long- and short-lived species. This diversity challenges theoreticians to develop broader perspectives on the evolution of ageing and empiricists to study the demography of more species.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4157354/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4157354/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jones, Owen R -- Scheuerlein, Alexander -- Salguero-Gomez, Roberto -- Camarda, Carlo Giovanni -- Schaible, Ralf -- Casper, Brenda B -- Dahlgren, Johan P -- Ehrlen, Johan -- Garcia, Maria B -- Menges, Eric S -- Quintana-Ascencio, Pedro F -- Caswell, Hal -- Baudisch, Annette -- Vaupel, James W -- P01 AG-031719/AG/NIA NIH HHS/ -- P01 AG031719/AG/NIA NIH HHS/ -- England -- Nature. 2014 Jan 9;505(7482):169-73. doi: 10.1038/nature12789. Epub 2013 Dec 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Max-Planck Odense Center on the Biodemography of Aging, Campusvej 55, 5230 Odense M, Denmark [2] Department of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark [3]. ; 1] Max Planck Institute for Demographic Research, Konrad-Zuse-Strasse 1, 18057 Rostock, Germany [2]. ; 1] Max Planck Institute for Demographic Research, Konrad-Zuse-Strasse 1, 18057 Rostock, Germany [2] School of Biological Sciences, Centre for Biodiversity and Conservation Science, University of Queensland, Brisbane QLD 4072, Australia. ; Institut National d'Etudes Demographiques, 133 Boulevard Davout, 75980 Paris Cedex 20, France. ; Max Planck Institute for Demographic Research, Konrad-Zuse-Strasse 1, 18057 Rostock, Germany. ; Department of Biology, University of Pennsylvania, 433 South University Avenue, Philadelphia, Pennsylvania 19104-6018, USA. ; 1] Max-Planck Odense Center on the Biodemography of Aging, Campusvej 55, 5230 Odense M, Denmark [2] Department of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark. ; Department of Ecology, Environment and Plant Sciences, Stockholm University, Lilla Frescativagen 5, 10691 Stockholm, Sweden. ; Pyrenean Institute of Ecology (CSIC), Avenida Montanana 1005, 50059 Zaragoza, Spain. ; Archbold Biological Station, 123 Main Drive, Venus, Florida 33960, USA. ; Department of Biology, University of Central Florida, 4110 Libra Drive, Orlando, Florida 32816-2368, USA. ; 1] Department of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark [2] Max Planck Institute for Demographic Research, Konrad-Zuse-Strasse 1, 18057 Rostock, Germany [3] Woods Hole Oceanographic Institution, Biology Department MS-34, Woods Hole, Massachusetts 02543 USA [4] Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, PO Box 94248, 1090GE Amsterdam, The Netherlands. ; 1] Max-Planck Odense Center on the Biodemography of Aging, Campusvej 55, 5230 Odense M, Denmark [2] Max Planck Institute for Demographic Research, Konrad-Zuse-Strasse 1, 18057 Rostock, Germany [3] Duke Population Research Institute, Duke University, Durham, North Carolina 27705, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24317695" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Aging/*physiology ; Animals ; Biological Evolution ; Chlorophyta ; Fertility/*physiology ; Longevity/*physiology ; *Phylogeny ; Plants ; Reproduction/physiology
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 48
    Publikationsdatum: 2013-11-23
    Beschreibung: Oxamniquine resistance evolved in the human blood fluke (Schistosoma mansoni) in Brazil in the 1970s. We crossed parental parasites differing ~500-fold in drug response, determined drug sensitivity and marker segregation in clonally derived second-generation progeny, and identified a single quantitative trait locus (logarithm of odds = 31) on chromosome 6. A sulfotransferase was identified as the causative gene by using RNA interference knockdown and biochemical complementation assays, and we subsequently demonstrated independent origins of loss-of-function mutations in field-derived and laboratory-selected resistant parasites. These results demonstrate the utility of linkage mapping in a human helminth parasite, while crystallographic analyses of protein-drug interactions illuminate the mode of drug action and provide a framework for rational design of oxamniquine derivatives that kill both S. mansoni and S. haematobium, the two species responsible for 〉99% of schistosomiasis cases worldwide.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4136436/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4136436/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Valentim, Claudia L L -- Cioli, Donato -- Chevalier, Frederic D -- Cao, Xiaohang -- Taylor, Alexander B -- Holloway, Stephen P -- Pica-Mattoccia, Livia -- Guidi, Alessandra -- Basso, Annalisa -- Tsai, Isheng J -- Berriman, Matthew -- Carvalho-Queiroz, Claudia -- Almeida, Marcio -- Aguilar, Hector -- Frantz, Doug E -- Hart, P John -- LoVerde, Philip T -- Anderson, Timothy J C -- 098051/Wellcome Trust/United Kingdom -- 5R21-AI072704/AI/NIAID NIH HHS/ -- 5R21-AI096277/AI/NIAID NIH HHS/ -- C06 RR013556/RR/NCRR NIH HHS/ -- HHSN272201000005I/PHS HHS/ -- R01 AI097576/AI/NIAID NIH HHS/ -- R01-AI097576/AI/NIAID NIH HHS/ -- R21 AI072704/AI/NIAID NIH HHS/ -- R21 AI096277/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2013 Dec 13;342(6164):1385-9. doi: 10.1126/science.1243106. Epub 2013 Nov 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departments of Biochemistry and Pathology, University of Texas Health Science Center, San Antonio, TX 78229, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24263136" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Sequence ; Animals ; Drug Resistance/*genetics ; Gene Knockdown Techniques ; Genetic Linkage ; Helminth Proteins/*genetics ; Humans ; Molecular Sequence Data ; Mutation ; Oxamniquine/*pharmacology ; Phylogeny ; Protein Conformation ; Quantitative Trait Loci ; RNA Interference ; Schistosoma mansoni/*drug effects/*genetics ; Schistosomicides/*pharmacology ; Sulfotransferases/chemistry/classification/*genetics
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 49
    Publikationsdatum: 2013-06-08
    Beschreibung: Evolutionarily young genes that serve essential functions represent a paradox; they must perform a function that either was not required until after their birth or was redundant with another gene. How young genes rapidly acquire essential function is largely unknown. We traced the evolutionary steps by which the Drosophila gene Umbrea acquired an essential role in chromosome segregation in D. melanogaster since the gene's origin less than 15 million years ago. Umbrea neofunctionalization occurred via loss of an ancestral heterochromatin-localizing domain, followed by alterations that rewired its protein interaction network and led to species-specific centromere localization. Our evolutionary cell biology approach provides temporal and mechanistic detail about how young genes gain essential function. Such innovations may constantly alter the repertoire of centromeric proteins in eukaryotes.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4119826/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4119826/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ross, Benjamin D -- Rosin, Leah -- Thomae, Andreas W -- Hiatt, Mary Alice -- Vermaak, Danielle -- de la Cruz, Aida Flor A -- Imhof, Axel -- Mellone, Barbara G -- Malik, Harmit S -- R01 GM074108/GM/NIGMS NIH HHS/ -- R01GM074108/GM/NIGMS NIH HHS/ -- T32HG000035/HG/NHGRI NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2013 Jun 7;340(6137):1211-4. doi: 10.1126/science.1234393.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular and Cellular Biology Program, University of Washington, Seattle, WA 98195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23744945" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Sequence ; Animals ; Centromere/genetics/*physiology ; Chromosomal Proteins, Non-Histone/*genetics ; Drosophila/*genetics ; Drosophila Proteins/*genetics ; *Evolution, Molecular ; Gene Duplication ; Genes, Insect/*physiology ; Molecular Sequence Data
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 50
    Publikationsdatum: 2013-08-31
    Beschreibung: Invasion of microbial DNA into the cytoplasm of animal cells triggers a cascade of host immune reactions that help clear the infection; however, self DNA in the cytoplasm can cause autoimmune diseases. Biochemical approaches led to the identification of cyclic guanosine monophosphate-adenosine monophosphate (cGAMP) synthase (cGAS) as a cytosolic DNA sensor that triggers innate immune responses. Here, we show that cells from cGAS-deficient (cGas(-/-)) mice, including fibroblasts, macrophages, and dendritic cells, failed to produce type I interferons and other cytokines in response to DNA transfection or DNA virus infection. cGas(-/-) mice were more susceptible to lethal infection with herpes simplex virus 1 (HSV1) than wild-type mice. We also show that cGAMP is an adjuvant that boosts antigen-specific T cell activation and antibody production in mice.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3863637/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3863637/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Xiao-Dong -- Wu, Jiaxi -- Gao, Daxing -- Wang, Hua -- Sun, Lijun -- Chen, Zhijian J -- 5T32AI070116/AI/NIAID NIH HHS/ -- AI-093967/AI/NIAID NIH HHS/ -- R01 AI093967/AI/NIAID NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2013 Sep 20;341(6152):1390-4. doi: 10.1126/science.1244040. Epub 2013 Aug 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9148, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23989956" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Antibodies, Viral/biosynthesis ; DNA, Viral/genetics/immunology ; Dendritic Cells/immunology ; Fibroblasts/immunology ; Herpes Simplex/*immunology ; *Herpesvirus 1, Human ; Interferon Regulatory Factor-3/genetics ; Interferon-beta/*biosynthesis/genetics ; Lymphocyte Activation ; Macrophages/immunology ; Mice ; Mice, Knockout ; Nucleotidyltransferases/genetics/*immunology ; Signal Transduction ; T-Lymphocytes/immunology ; Transfection
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 51
    Publikationsdatum: 2013-08-10
    Beschreibung: Chromosome translocations are a hallmark of cancer cells. We have developed an experimental system to visualize the formation of translocations in living cells and apply it to characterize the spatial and dynamic properties of translocation formation. We demonstrate that translocations form within hours of the occurrence of double-strand breaks (DSBs) and that their formation is cell cycle-independent. Translocations form preferentially between prepositioned genome elements, and perturbation of key factors of the DNA repair machinery uncouples DSB pairing from translocation formation. These observations generate a spatiotemporal framework for the formation of translocations in living cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roukos, Vassilis -- Voss, Ty C -- Schmidt, Christine K -- Lee, Seungtaek -- Wangsa, Darawalee -- Misteli, Tom -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2013 Aug 9;341(6146):660-4. doi: 10.1126/science.1237150.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Cancer Institute, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23929981" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Bacterial Proteins/genetics ; Carrier Proteins/genetics ; Cell Cycle ; *DNA Breaks, Double-Stranded ; DNA Repair ; DNA-Activated Protein Kinase/antagonists & inhibitors ; DNA-Binding Proteins/antagonists & inhibitors ; Green Fluorescent Proteins/genetics ; High-Throughput Screening Assays ; Lac Operon ; Lac Repressors/genetics ; Mice ; Microscopy/methods ; NIH 3T3 Cells ; Neoplasms/genetics ; Nuclear Proteins/antagonists & inhibitors ; *Time-Lapse Imaging ; *Translocation, Genetic
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 52
    Publikationsdatum: 2013-10-26
    Beschreibung: Painful venoms are used to deter predators. Pain itself, however, can signal damage and thus serves an important adaptive function. Evolution to reduce general pain responses, although valuable for preying on venomous species, is rare, likely because it comes with the risk of reduced response to tissue damage. Bark scorpions capitalize on the protective pain pathway of predators by inflicting intensely painful stings. However, grasshopper mice regularly attack and consume bark scorpions, grooming only briefly when stung. Bark scorpion venom induces pain in many mammals (house mice, rats, humans) by activating the voltage-gated Na(+) channel Nav1.7, but has no effect on Nav1.8. Grasshopper mice Nav1.8 has amino acid variants that bind bark scorpion toxins and inhibit Na(+) currents, blocking action potential propagation and inducing analgesia. Thus, grasshopper mice have solved the predator-pain problem by using a toxin bound to a nontarget channel to block transmission of the pain signals the venom itself is initiating.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172297/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172297/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rowe, Ashlee H -- Xiao, Yucheng -- Rowe, Matthew P -- Cummins, Theodore R -- Zakon, Harold H -- NS 053422/NS/NINDS NIH HHS/ -- R01 NS053422/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2013 Oct 25;342(6157):441-6. doi: 10.1126/science.1236451.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section of Neurobiology, The University of Texas at Austin, Austin, TX 78712, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24159039" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Action Potentials/drug effects/physiology ; Amino Acid Sequence ; Animals ; Arvicolinae/*metabolism ; *Food Chain ; Formaldehyde/pharmacology ; Mice ; Molecular Sequence Data ; NAV1.7 Voltage-Gated Sodium Channel/chemistry/genetics/*metabolism ; NAV1.8 Voltage-Gated Sodium Channel/chemistry/genetics/*metabolism ; Pain/chemically induced/*metabolism ; *Predatory Behavior ; Protein Structure, Tertiary ; Scorpion Venoms
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 53
    Publikationsdatum: 2013-10-12
    Beschreibung: Diverse eukaryotic hosts produce virus-derived small interfering RNAs (siRNAs) to direct antiviral immunity by RNA interference (RNAi). However, it remains unknown whether the mammalian RNAi pathway has a natural antiviral function. Here, we show that infection of hamster cells and suckling mice by Nodamura virus (NoV), a mosquito-transmissible RNA virus, requires RNAi suppression by its B2 protein. Loss of B2 expression or its suppressor activity leads to abundant production of viral siRNAs and rapid clearance of the mutant viruses in mice. However, viral small RNAs detected during virulent infection by NoV do not have the properties of canonical siRNAs. These findings have parallels with the induction and suppression of antiviral RNAi by the related Flock house virus in fruit flies and nematodes and reveal a mammalian antiviral immunity mechanism mediated by RNAi.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3875315/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3875315/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Yang -- Lu, Jinfeng -- Han, Yanhong -- Fan, Xiaoxu -- Ding, Shou-Wei -- AI52447/AI/NIAID NIH HHS/ -- GM94396/GM/NIGMS NIH HHS/ -- R01 AI052447/AI/NIAID NIH HHS/ -- R01 GM094396/GM/NIGMS NIH HHS/ -- RC1 GM091896/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2013 Oct 11;342(6155):231-4. doi: 10.1126/science.1241911.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24115437" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Line ; Cricetinae ; Mice ; Nodaviridae/genetics/*pathogenicity ; RNA Interference/*immunology ; RNA Virus Infections/*immunology ; RNA, Small Interfering/*immunology ; RNA, Viral/genetics/*immunology ; Viral Nonstructural Proteins/genetics/*immunology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 54
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-02-16
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉van der Oost, John -- New York, N.Y. -- Science. 2013 Feb 15;339(6121):768-70. doi: 10.1126/science.1234726.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Microbiology, Wageningen University, Wageningen, Netherlands. john.vanderoost@wur.nl〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23413345" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Caspase 9/*chemistry ; *DNA Cleavage ; Gene Targeting/*methods ; Genetic Engineering/*methods ; Genome/*genetics ; Genome, Human/*genetics ; Humans ; Inverted Repeat Sequences/*genetics ; Microarray Analysis/*methods ; RNA/*chemistry
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 55
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-11-23
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carboneras, C -- Walton, P -- Vila, M -- New York, N.Y. -- Science. 2013 Nov 22;342(6161):930-1. doi: 10.1126/science.342.6161.930-b.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Royal Society for the Protection of Birds, The Lodge, Sandy, Bedfordshire, SG19 2DL, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24264976" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Europe ; European Union ; Introduced Species/economics/*legislation & jurisprudence/statistics & numerical ; data ; Social Control, Formal
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 56
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-12-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 2013 Dec 20;342(6165):1435-41. doi: 10.1126/science.342.6165.1444.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24357296" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Biological Science Disciplines/history/*trends ; History, 21st Century ; Humans
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 57
    Publikationsdatum: 2013-03-30
    Beschreibung: Based on nuclear and mitochondrial DNA, Hailer et al. (Reports, 20 April 2012, p. 344) suggested early divergence of polar bears from a common ancestor with brown bears and subsequent introgression. Our population genetic analysis that traces each of the genealogies in the independent nuclear loci does not support the evolutionary model proposed by the authors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nakagome, Shigeki -- Mano, Shuhei -- Hasegawa, Masami -- New York, N.Y. -- Science. 2013 Mar 29;339(6127):1522. doi: 10.1126/science.1227339.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Statistical Mathematics, Tachikawa, Tokyo, Japan. nakagome@ism.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23539580" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Biological Evolution ; *Genome ; *Multilocus Sequence Typing ; Ursidae/*genetics
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  • 58
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-12-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 2013 Dec 20;342(6165):1442. doi: 10.1126/science.342.6165.1442-b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24357294" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Behavior ; Brain/physiology/*ultrastructure ; Electrical Synapses/physiology/ultrastructure ; Humans ; Immunotherapy/*methods ; Mice ; Neoplasms/*therapy ; Sequence Analysis, DNA/*trends ; Single-Cell Analysis/*trends
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    Standort Signatur Erwartet Verfügbarkeit
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  • 59
    Publikationsdatum: 2013-06-15
    Beschreibung: The Root effect is a pH-dependent reduction in hemoglobin-O2 carrying capacity. Specific to ray-finned fishes, the Root effect has been ascribed specialized roles in retinal oxygenation and swimbladder inflation. We report that when rainbow trout are exposed to elevated water carbon dioxide (CO2), red muscle partial pressure of oxygen (PO2) increases by 65%--evidence that Root hemoglobins enhance general tissue O2 delivery during acidotic stress. Inhibiting carbonic anhydrase (CA) in the plasma abolished this effect. We argue that CA activity in muscle capillaries short-circuits red blood cell (RBC) pH regulation. This acidifies RBCs, unloads O2 from hemoglobin, and elevates tissue PO2, which could double O2 delivery with no change in perfusion. This previously undescribed mechanism to enhance O2 delivery during stress may represent the incipient function of Root hemoglobins in fishes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rummer, Jodie L -- McKenzie, David J -- Innocenti, Alessio -- Supuran, Claudiu T -- Brauner, Colin J -- New York, N.Y. -- Science. 2013 Jun 14;340(6138):1327-9. doi: 10.1126/science.1233692.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, British Columbia V6T 1Z4, Canada. jodie.rummer@jcu.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23766325" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Carbon Dioxide/metabolism ; Erythrocytes/metabolism ; Hemoglobins/*metabolism ; Hydrogen-Ion Concentration ; Muscle, Skeletal/metabolism ; Oncorhynchus mykiss/*blood/*metabolism ; Oxygen/*blood/*metabolism ; Partial Pressure ; Stress, Physiological
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  • 60
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-05-21
    Beschreibung: Evidence for transcriptional feedback in circadian timekeeping is abundant, yet little is known about the mechanisms underlying translational control. We found that ATAXIN-2 (ATX2), an RNA-associated protein involved in neurodegenerative disease, is a translational activator of the rate-limiting clock component PERIOD (PER) in Drosophila. ATX2 specifically interacted with TWENTY-FOUR (TYF), an activator of PER translation. RNA interference-mediated depletion of Atx2 or the expression of a mutant ATX2 protein that does not associate with polyadenylate-binding protein (PABP) suppressed behavioral rhythms and decreased abundance of PER. Although ATX2 can repress translation, depletion of Atx2 from Drosophila S2 cells inhibited translational activation by RNA-tethered TYF and disrupted the association between TYF and PABP. Thus, ATX2 coordinates an active translation complex important for PER expression and circadian rhythms.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lim, Chunghun -- Allada, Ravi -- R01NS059042/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2013 May 17;340(6134):875-9. doi: 10.1126/science.1234785.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Northwestern University, Evanston, IL 60208, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23687047" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Ataxins ; Cell Line ; *Circadian Rhythm ; Drosophila Proteins/*biosynthesis/genetics/metabolism ; Drosophila melanogaster/metabolism/*physiology ; Mutation ; Nerve Tissue Proteins/genetics/*metabolism ; Period Circadian Proteins/*biosynthesis ; Poly(A)-Binding Proteins/metabolism ; Protein Biosynthesis ; RNA Interference
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  • 61
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-08-09
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jaffe, Harold -- Patterson, Amy P -- Lurie, Nicole -- New York, N.Y. -- Science. 2013 Aug 16;341(6147):713-4. doi: 10.1126/science.1244158. Epub 2013 Aug 7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23926189" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Biomedical Research ; Containment of Biohazards ; *Government Regulation ; *Influenza A virus/genetics/pathogenicity/physiology ; Mammals ; Orthomyxoviridae Infections/transmission/*virology ; Risk Assessment ; Safety Management ; United States ; *United States Dept. of Health and Human Services
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 62
    Publikationsdatum: 2013-05-25
    Beschreibung: Cramer et al. (Reports, 23 March 2012, p. 1503; published online 9 February 2012) reported that bexarotene rapidly reduces beta-amyloid (Abeta) levels and plaque burden in two mouse models of Abeta deposition in Alzheimer's disease (AD). We now report that, although bexarotene reduces soluble Abeta40 levels in one of the mouse models, the drug has no impact on plaque burden in three strains that exhibit Abeta amyloidosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Veeraraghavalu, Karthikeyan -- Zhang, Can -- Miller, Sean -- Hefendehl, Jasmin K -- Rajapaksha, Tharinda W -- Ulrich, Jason -- Jucker, Mathias -- Holtzman, David M -- Tanzi, Rudolph E -- Vassar, Robert -- Sisodia, Sangram S -- New York, N.Y. -- Science. 2013 May 24;340(6135):924-f. doi: 10.1126/science.1235505.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, University of Chicago, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23704555" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Alzheimer Disease/*drug therapy/*metabolism ; Amyloid beta-Peptides/*metabolism ; Animals ; Apolipoproteins E/*metabolism ; Brain/*metabolism ; Male ; Tetrahydronaphthalenes/*pharmacology/*therapeutic use
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  • 63
    Publikationsdatum: 2013-12-07
    Beschreibung: The skin is a classical example of a tissue maintained by stem cells. However, the identity of the stem cells that maintain the interfollicular epidermis and the source of the signals that control their activity remain unclear. Using mouse lineage tracing and quantitative clonal analyses, we showed that the Wnt target gene Axin2 marks interfollicular epidermal stem cells. These Axin2-expressing cells constitute the majority of the basal epidermal layer, compete neutrally, and require Wnt/beta-catenin signaling to proliferate. The same cells contribute robustly to wound healing, with no requirement for a quiescent stem cell subpopulation. By means of double-labeling RNA in situ hybridization in mice, we showed that the Axin2-expressing cells themselves produce Wnt signals as well as long-range secreted Wnt inhibitors, suggesting an autocrine mechanism of stem cell self-renewal.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4081860/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4081860/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lim, Xinhong -- Tan, Si Hui -- Koh, Winston Lian Chye -- Chau, Rosanna Man Wah -- Yan, Kelley S -- Kuo, Calvin J -- van Amerongen, Renee -- Klein, Allon Moshe -- Nusse, Roel -- 1R01DK085720/DK/NIDDK NIH HHS/ -- 1U01DK085527/DK/NIDDK NIH HHS/ -- 5K08DK096048/DK/NIDDK NIH HHS/ -- K08 DK096048/DK/NIDDK NIH HHS/ -- P30 DK026743/DK/NIDDK NIH HHS/ -- R01 DK085720/DK/NIDDK NIH HHS/ -- U01 DK085527/DK/NIDDK NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2013 Dec 6;342(6163):1226-30. doi: 10.1126/science.1239730.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Developmental Biology, Howard Hughes Medical Institute (HHMI), Institute for Stem Cell Biology and Regenerative Medicine, School of Medicine, Stanford University, Stanford, CA, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24311688" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Autocrine Communication ; Axin Protein/genetics/metabolism ; Cell Differentiation ; Cell Lineage ; Cell Proliferation ; Cells, Cultured ; Epidermis/*cytology/injuries/metabolism ; Epithelial Cells/cytology/metabolism ; Gene Expression ; Homeostasis ; Humans ; Intercellular Signaling Peptides and Proteins/metabolism ; Keratinocytes/cytology/metabolism ; Mice ; Regeneration ; Skin/injuries ; Stem Cell Niche ; Stem Cells/cytology/*physiology ; Wnt Proteins/metabolism ; *Wnt Signaling Pathway ; Wound Healing ; beta Catenin/genetics/metabolism
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  • 64
    Publikationsdatum: 2013-03-16
    Beschreibung: Silicatein-alpha is responsible for the biomineralization of silicates in sponges. We used silicatein-alpha to guide the self-assembly of calcite "spicules" similar to the spicules of the calcareous sponge Sycon sp. The self-assembled spicules, 10 to 300 micrometers (mum) in length and 5 to 10 mum in diameter, are composed of aligned calcite nanocrystals. The spicules are initially amorphous but transform into calcite within months, exhibiting unusual growth along [100]. They scatter x-rays like twinned calcite crystals. Whereas natural spicules evidence brittle failure, the synthetic spicules show an elastic response, which greatly enhances bending strength. This remarkable feature is linked to a high protein content. With nano-thermogravimetric analysis, we measured the organic content of a single spicule to be 10 to 16%. In addition, the spicules exhibit waveguiding properties even when they are bent.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Natalio, Filipe -- Corrales, Tomas P -- Panthofer, Martin -- Schollmeyer, Dieter -- Lieberwirth, Ingo -- Muller, Werner E G -- Kappl, Michael -- Butt, Hans-Jurgen -- Tremel, Wolfgang -- New York, N.Y. -- Science. 2013 Mar 15;339(6125):1298-302. doi: 10.1126/science.1216260.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut fur Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universitat, Mainz, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23493708" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Calcium Carbonate/*chemistry ; Cathepsins/*chemistry ; Microscopy, Electron, Transmission ; Nanoparticles/chemistry ; Porifera ; Spectroscopy, Fourier Transform Infrared ; *Stress, Mechanical
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  • 65
    Publikationsdatum: 2013-08-03
    Beschreibung: An inducible program of inflammatory gene expression is central to antimicrobial defenses. This response is controlled by a collaboration involving signal-dependent activation of transcription factors, transcriptional co-regulators, and chromatin-modifying factors. We have identified a long noncoding RNA (lncRNA) that acts as a key regulator of this inflammatory response. Pattern recognition receptors such as the Toll-like receptors induce the expression of numerous lncRNAs. One of these, lincRNA-Cox2, mediates both the activation and repression of distinct classes of immune genes. Transcriptional repression of target genes is dependent on interactions of lincRNA-Cox2 with heterogeneous nuclear ribonucleoprotein A/B and A2/B1. Collectively, these studies unveil a central role of lincRNA-Cox2 as a broad-acting regulatory component of the circuit that controls the inflammatory response.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4376668/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4376668/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carpenter, Susan -- Aiello, Daniel -- Atianand, Maninjay K -- Ricci, Emiliano P -- Gandhi, Pallavi -- Hall, Lisa L -- Byron, Meg -- Monks, Brian -- Henry-Bezy, Meabh -- Lawrence, Jeanne B -- O'Neill, Luke A J -- Moore, Melissa J -- Caffrey, Daniel R -- Fitzgerald, Katherine A -- AI067497/AI/NIAID NIH HHS/ -- GM053234/GM/NIGMS NIH HHS/ -- R01 AI067497/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2013 Aug 16;341(6147):789-92. doi: 10.1126/science.1240925. Epub 2013 Aug 1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Infectious Diseases and Immunology, Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23907535" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Line ; Cell Nucleus/metabolism ; Cyclooxygenase 2/genetics ; Cytokines/genetics/metabolism ; Cytosol/metabolism ; *Gene Expression Regulation ; Heterogeneous-Nuclear Ribonucleoproteins/metabolism ; Immunity, Innate/*genetics ; Inflammation/*genetics ; Macrophage Activation ; Macrophages/*immunology/*metabolism ; Mice ; Models, Immunological ; RNA Interference ; RNA, Long Noncoding/*genetics/metabolism ; Toll-Like Receptors/genetics/metabolism ; Transcription Factors/genetics/metabolism ; Transcription, Genetic ; Transcriptional Activation
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 66
    Publikationsdatum: 2013-06-15
    Beschreibung: Epistatic interactions between mutant sites in the same protein can exert a strong influence on pathways of molecular evolution. We performed protein engineering experiments that revealed pervasive epistasis among segregating amino acid variants that contribute to adaptive functional variation in deer mouse hemoglobin (Hb). Amino acid mutations increased or decreased Hb-O2 affinity depending on the allelic state of other sites. Structural analysis revealed that epistasis for Hb-O2 affinity and allosteric regulatory control is attributable to indirect interactions between structurally remote sites. The prevalence of sign epistasis for fitness-related biochemical phenotypes has important implications for the evolutionary dynamics of protein polymorphism in natural populations.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4409680/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4409680/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Natarajan, Chandrasekhar -- Inoguchi, Noriko -- Weber, Roy E -- Fago, Angela -- Moriyama, Hideaki -- Storz, Jay F -- HL087216-S1/HL/NHLBI NIH HHS/ -- R01 HL087216/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2013 Jun 14;340(6138):1324-7. doi: 10.1126/science.1236862.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Biological Sciences, University of Nebraska, Lincoln, NE 68588, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23766324" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adaptation, Biological/*genetics ; Alleles ; Animals ; *Epistasis, Genetic ; *Evolution, Molecular ; Exons ; Genetic Variation ; Hemoglobins/*chemistry/*genetics ; Hydrogen Bonding ; Mutation ; Oxygen/chemistry ; Peromyscus/genetics/*physiology ; Polymorphism, Genetic ; Protein Structure, Secondary ; alpha-Globins/chemistry/genetics ; beta-Globins/genetics
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  • 67
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-12-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 2013 Dec 20;342(6165):1440-1. doi: 10.1126/science.342.6165.1440-b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24357292" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Anti-Bacterial Agents/administration & dosage ; Fusobacterium/physiology ; Gastrointestinal Tract/*microbiology ; *Health ; Humans ; Infant ; Infant Formula/chemistry ; Kidney/metabolism ; Kidney Calculi/chemically induced/etiology ; Klebsiella/drug effects/metabolism ; Malnutrition/microbiology ; Neoplasms/microbiology ; Rats ; Triazines/metabolism/toxicity
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 68
    facet.materialart.
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-12-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 2013 Dec 20;342(6165):1440. doi: 10.1126/science.342.6165.1440-a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24357291" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amyloid beta-Peptides/metabolism ; Animals ; Biological Transport ; Brain/*metabolism ; Coloring Agents/analysis/pharmacokinetics ; Mice ; Sleep/*physiology
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  • 69
    facet.materialart.
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-08-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Verger, Philippe J P -- Boobis, Alan R -- New York, N.Y. -- Science. 2013 Aug 16;341(6147):717-8. doi: 10.1126/science.1241572.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉World Health Organization, Geneva, Switzerland. vergerp@who.int〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23950515" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Crops, Agricultural/*chemistry ; Developing Countries ; *Food Safety ; *Food Supply ; Humans ; International Cooperation ; *Pesticide Residues/analysis/toxicity ; *Pesticides/analysis/metabolism/toxicity ; Risk Assessment ; Toxicity Tests
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  • 70
    Publikationsdatum: 2013-05-21
    Beschreibung: The generation of high-affinity antibodies depends on the ability of B cells to extract antigens from the surfaces of antigen-presenting cells. B cells that express high-affinity B cell receptors (BCRs) acquire more antigen and obtain better T cell help. However, the mechanisms by which B cells extract antigen remain unclear. Using fluid and flexible membrane substrates to mimic antigen-presenting cells, we showed that B cells acquire antigen by dynamic myosin IIa-mediated contractions that pull out and invaginate the presenting membranes. The forces generated by myosin IIa contractions ruptured most individual BCR-antigen bonds and promoted internalization of only high-affinity, multivalent BCR microclusters. Thus, B cell contractility contributes to affinity discrimination by mechanically testing the strength of antigen binding.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3713314/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3713314/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Natkanski, Elizabeth -- Lee, Wing-Yiu -- Mistry, Bhakti -- Casal, Antonio -- Molloy, Justin E -- Tolar, Pavel -- MC_U117570592/Medical Research Council/United Kingdom -- MC_U117597138/Medical Research Council/United Kingdom -- U117570592/Medical Research Council/United Kingdom -- U117597138/Medical Research Council/United Kingdom -- New York, N.Y. -- Science. 2013 Jun 28;340(6140):1587-90. doi: 10.1126/science.1237572. Epub 2013 May 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Immune Cell Biology, MRC National Institute for Medical Research, Mill Hill, London NW7 1AA, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23686338" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Antibody Affinity ; *Antigen Presentation ; Antigens/*immunology ; B-Lymphocytes/*immunology ; Cells, Cultured ; Mechanical Processes ; Mice ; Mice, Inbred C57BL ; Microscopy, Atomic Force ; Nonmuscle Myosin Type IIA/*physiology ; Receptors, Antigen, B-Cell/immunology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 71
    Publikationsdatum: 2013-06-15
    Beschreibung: Different stimulus intensities elicit distinct perceptions, implying that input signals are either conveyed through an overlapping but distinct subpopulation of sensory neurons or channeled into divergent brain circuits according to intensity. In Drosophila, carbon dioxide (CO2) is detected by a single type of olfactory sensory neuron, but information is conveyed to higher brain centers through second-order projection neurons (PNs). Two distinct pathways, PN(v)-1 and PN(v)-2, are necessary and sufficient for avoidance responses to low and high CO2 concentrations, respectively. Whereas low concentrations activate PN(v)-1, high concentrations activate both PN(v)s and GABAergic PN(v)-3, which may inhibit PN(v)-1 pathway-mediated avoidance behavior. Channeling a sensory input into distinct neural pathways allows the perception of an odor to be further modulated by both stimulus intensity and context.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, Hui-Hao -- Chu, Li-An -- Fu, Tsai-Feng -- Dickson, Barry J -- Chiang, Ann-Shyn -- New York, N.Y. -- Science. 2013 Jun 14;340(6138):1338-41. doi: 10.1126/science.1236693.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Biotechnology, National Tsing Hua University, Hsinchu 30013, Taiwan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23766327" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Carbon Dioxide ; Drosophila melanogaster/*physiology ; Escape Reaction/*physiology ; Olfactory Pathways/*physiology ; Olfactory Receptor Neurons/cytology/*physiology
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  • 72
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-02-23
    Beschreibung: 〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4240228/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4240228/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ryan, Karen K -- Seeley, Randy J -- DK093848/DK/NIDDK NIH HHS/ -- HL111319/HL/NHLBI NIH HHS/ -- K99 HL111319/HL/NHLBI NIH HHS/ -- R01 DK093848/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2013 Feb 22;339(6122):918-9. doi: 10.1126/science.1234062.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Metabolic Diseases Institute, University of Cincinnati, Cincinnati, OH 45237, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23430646" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acids, Branched-Chain/metabolism ; Animals ; Bacteria/metabolism ; Diet ; Dietary Carbohydrates/*metabolism ; Dietary Fats/*metabolism ; Digestive System/microbiology ; Fatty Acids/metabolism ; *Food ; *Hormones ; Humans ; Nutritional Physiological Phenomena ; *Signal Transduction
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 73
    Publikationsdatum: 2013-04-27
    Beschreibung: Secondary bacterial pneumonia leads to increased morbidity and mortality from influenza virus infections. What causes this increased susceptibility, however, is not well defined. Host defense from infection relies not only on immune resistance mechanisms but also on the ability to tolerate a given level of pathogen burden. Failure of either resistance or tolerance can contribute to disease severity, making it hard to distinguish their relative contribution. We employ a coinfection mouse model of influenza virus and Legionella pneumophila in which we can separate resistance and tolerance. We demonstrate that influenza virus can promote susceptibility to lethal bacterial coinfection, even when bacterial infection is controlled by the immune system. We propose that this failure of host defense is due to impaired ability to tolerate tissue damage.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3933032/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3933032/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jamieson, Amanda M -- Pasman, Lesley -- Yu, Shuang -- Gamradt, Pia -- Homer, Robert J -- Decker, Thomas -- Medzhitov, Ruslan -- AI R01 055502/AI/NIAID NIH HHS/ -- R01 046688/PHS HHS/ -- R01 AI046688/AI/NIAID NIH HHS/ -- R01 AI055502/AI/NIAID NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2013 Jun 7;340(6137):1230-4. doi: 10.1126/science.1233632. Epub 2013 Apr 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06520, USA. amanda_jamieson@brown.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23618765" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Caspase 1 ; Coinfection/*immunology/pathology ; Disease Models, Animal ; Host-Pathogen Interactions/immunology ; Interleukin-1beta/metabolism ; *Legionella pneumophila ; Legionnaires' Disease/*immunology/pathology ; Lung/microbiology/pathology/virology ; Mice ; Mice, Inbred C57BL ; *Orthomyxoviridae ; Orthomyxoviridae Infections/*immunology/pathology ; Pneumonia, Bacterial/*immunology/pathology ; Toll-Like Receptor 2/metabolism ; Toll-Like Receptor 3/metabolism ; Toll-Like Receptor 4/metabolism ; Tumor Necrosis Factor-alpha/metabolism
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 74
    Publikationsdatum: 2013-12-18
    Beschreibung: An understanding of ctenophore biology is critical for reconstructing events that occurred early in animal evolution. Toward this goal, we have sequenced, assembled, and annotated the genome of the ctenophore Mnemiopsis leidyi. Our phylogenomic analyses of both amino acid positions and gene content suggest that ctenophores rather than sponges are the sister lineage to all other animals. Mnemiopsis lacks many of the genes found in bilaterian mesodermal cell types, suggesting that these cell types evolved independently. The set of neural genes in Mnemiopsis is similar to that of sponges, indicating that sponges may have lost a nervous system. These results present a newly supported view of early animal evolution that accounts for major losses and/or gains of sophisticated cell types, including nerve and muscle cells.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3920664/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3920664/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ryan, Joseph F -- Pang, Kevin -- Schnitzler, Christine E -- Nguyen, Anh-Dao -- Moreland, R Travis -- Simmons, David K -- Koch, Bernard J -- Francis, Warren R -- Havlak, Paul -- NISC Comparative Sequencing Program -- Smith, Stephen A -- Putnam, Nicholas H -- Haddock, Steven H D -- Dunn, Casey W -- Wolfsberg, Tyra G -- Mullikin, James C -- Martindale, Mark Q -- Baxevanis, Andreas D -- ZIA HG000140-13/Intramural NIH HHS/ -- ZIA HG000140-14/Intramural NIH HHS/ -- ZIA HG000140-15/Intramural NIH HHS/ -- New York, N.Y. -- Science. 2013 Dec 13;342(6164):1242592. doi: 10.1126/science.1242592.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Genome Technology Branch, Division of Intramural Research, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24337300" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Base Sequence ; *Biological Evolution ; Cell Lineage/*genetics ; Ctenophora/classification/*cytology/*genetics ; *Genome ; Mesoderm/cytology ; Molecular Sequence Data ; Muscle Development/genetics ; Neurogenesis/genetics ; Phylogeny
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 75
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-11-16
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Verissimo, Diogo -- New York, N.Y. -- Science. 2013 Nov 15;342(6160):798-9. doi: 10.1126/science.342.6160.798-b.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Durrell Institute of Conservation and Ecology, University of Kent, Canterbury, CT2 7NZ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24233705" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Crops, Agricultural ; Insect Control/*methods ; *Insecticides ; *Oryza
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 76
    Publikationsdatum: 2013-11-23
    Beschreibung: Cancer is a disease in which cells accumulate genetic aberrations that are believed to confer a clonal advantage over cells in the surrounding tissue. However, the quantitative benefit of frequently occurring mutations during tumor development remains unknown. We quantified the competitive advantage of Apc loss, Kras activation, and P53 mutations in the mouse intestine. Our findings indicate that the fate conferred by these mutations is not deterministic, and many mutated stem cells are replaced by wild-type stem cells after biased, but still stochastic events. Furthermore, P53 mutations display a condition-dependent advantage, and especially in colitis-affected intestines, clones harboring mutations in this gene are favored. Our work confirms the previously theoretical notion that the tissue architecture of the intestine suppresses the accumulation of mutated lineages.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vermeulen, Louis -- Morrissey, Edward -- van der Heijden, Maartje -- Nicholson, Anna M -- Sottoriva, Andrea -- Buczacki, Simon -- Kemp, Richard -- Tavare, Simon -- Winton, Douglas J -- Cancer Research UK/United Kingdom -- New York, N.Y. -- Science. 2013 Nov 22;342(6161):995-8. doi: 10.1126/science.1243148.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cancer Research UK, Cambridge Institute, University of Cambridge, Robinson Way, Cambridge CB2 0RE, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24264992" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adenomatous Polyposis Coli Protein/genetics ; Animals ; Cell Transformation, Neoplastic/*genetics/*pathology ; *Gene Expression Regulation, Neoplastic ; Intestinal Neoplasms/*genetics/*pathology ; Mice ; Mice, Mutant Strains ; Models, Biological ; Mutation ; Neoplastic Stem Cells/metabolism/*pathology ; Proto-Oncogene Proteins p21(ras)/genetics ; Transcriptional Activation ; Tumor Suppressor Protein p53/genetics
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 77
    Publikationsdatum: 2013-09-28
    Beschreibung: The growing prevalence of overeating disorders is a key contributor to the worldwide obesity epidemic. Dysfunction of particular neural circuits may trigger deviations from adaptive feeding behaviors. The lateral hypothalamus (LH) is a crucial neural substrate for motivated behavior, including feeding, but the precise functional neurocircuitry that controls LH neuronal activity to engage feeding has not been defined. We observed that inhibitory synaptic inputs from the extended amygdala preferentially innervate and suppress the activity of LH glutamatergic neurons to control food intake. These findings help explain how dysregulated activity at a number of unique nodes can result in a cascading failure within a defined brain network to produce maladaptive feeding.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4131546/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4131546/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jennings, Joshua H -- Rizzi, Giorgio -- Stamatakis, Alice M -- Ung, Randall L -- Stuber, Garret D -- AA011605/AA/NIAAA NIH HHS/ -- AA022234/AA/NIAAA NIH HHS/ -- DA032750/DA/NIDA NIH HHS/ -- DA034472/DA/NIDA NIH HHS/ -- F31 DA034472/DA/NIDA NIH HHS/ -- NS007431/NS/NINDS NIH HHS/ -- P30 NS045892/NS/NINDS NIH HHS/ -- P50 AA011605/AA/NIAAA NIH HHS/ -- R01 DA032750/DA/NIDA NIH HHS/ -- New York, N.Y. -- Science. 2013 Sep 27;341(6153):1517-21. doi: 10.1126/science.1241812.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24072922" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adaptation, Physiological ; Amygdala/physiology ; Animals ; Bacterial Proteins/genetics/metabolism ; Eating/*physiology ; Feeding Behavior/*physiology ; GABAergic Neurons/*physiology ; Hypothalamus/*physiology ; Luminescent Proteins/genetics/metabolism ; Male ; Mice ; Mice, Mutant Strains ; Obesity/physiopathology ; Rhodopsin/genetics/metabolism ; Septal Nuclei/physiology ; Synapses/physiology ; gamma-Aminobutyric Acid/metabolism/physiology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 78
    Publikationsdatum: 2013-04-27
    Beschreibung: Color patterns of bird plumage affect animal behavior and speciation. Diverse patterns are present in different species and within the individual. Here, we study the cellular and molecular basis of feather pigment pattern formation. Melanocyte progenitors are distributed as a horizontal ring in the proximal follicle, sending melanocytes vertically up into the epithelial cylinder, which gradually emerges as feathers grow. Different pigment patterns form by modulating the presence, arrangement, or differentiation of melanocytes. A layer of peripheral pulp further regulates pigmentation via patterned agouti expression. Lifetime feather cyclic regeneration resets pigment patterns for physiological needs. Thus, the evolution of stem cell niche topology allows complex pigment patterning through combinatorial co-option of simple regulatory mechanisms.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4144997/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4144997/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, S J -- Foley, J -- Jiang, T X -- Yeh, C Y -- Wu, P -- Foley, A -- Yen, C M -- Huang, Y C -- Cheng, H C -- Chen, C F -- Reeder, B -- Jee, S H -- Widelitz, R B -- Chuong, C M -- AR060306/AR/NIAMS NIH HHS/ -- AR42177/AR/NIAMS NIH HHS/ -- AR47364/AR/NIAMS NIH HHS/ -- R01 AR042177/AR/NIAMS NIH HHS/ -- R01 AR047364/AR/NIAMS NIH HHS/ -- New York, N.Y. -- Science. 2013 Jun 21;340(6139):1442-5. doi: 10.1126/science.1230374. Epub 2013 Apr 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23618762" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Agouti Signaling Protein/metabolism ; Animals ; Birds/*anatomy & histology/physiology ; Cell Differentiation ; Cell Lineage ; Cell Proliferation ; Chickens/anatomy & histology/physiology ; Columbidae/anatomy & histology/physiology ; Feathers/*cytology/growth & development ; Female ; Galliformes/anatomy & histology/physiology ; Male ; Melanocytes/*cytology/physiology ; Models, Biological ; *Pigmentation ; Regeneration ; *Stem Cell Niche ; Stem Cells/*cytology/physiology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 79
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-12-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 2013 Dec 20;342(6165):1436-7. doi: 10.1126/science.342.6165.1436-b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24357288" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Brain/anatomy & histology/blood supply/*growth & development ; Humans ; Induced Pluripotent Stem Cells/*cytology ; Neural Stem Cells/*cytology ; *Neurogenesis ; *Organ Culture Techniques
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 80
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-12-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 2013 Dec 20;342(6165):1436. doi: 10.1126/science.342.6165.1436-a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24357287" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Line ; Cell Separation ; Cloning, Organism/*methods ; Female ; Humans ; *Induced Pluripotent Stem Cells ; Nuclear Transfer Techniques ; Pregnancy ; *Research Embryo Creation ; Surrogate Mothers
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 81
    Publikationsdatum: 2013-11-02
    Beschreibung: Central nervous system injuries are accompanied by scar formation. It has been difficult to delineate the precise role of the scar, as it is made by several different cell types, which may limit the damage but also inhibit axonal regrowth. We show that scarring by neural stem cell-derived astrocytes is required to restrict secondary enlargement of the lesion and further axonal loss after spinal cord injury. Moreover, neural stem cell progeny exerts a neurotrophic effect required for survival of neurons adjacent to the lesion. One distinct component of the glial scar, deriving from resident neural stem cells, is required for maintaining the integrity of the injured spinal cord.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sabelstrom, Hanna -- Stenudd, Moa -- Reu, Pedro -- Dias, David O -- Elfineh, Marta -- Zdunek, Sofia -- Damberg, Peter -- Goritz, Christian -- Frisen, Jonas -- New York, N.Y. -- Science. 2013 Nov 1;342(6158):637-40. doi: 10.1126/science.1242576.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell and Molecular Biology, Karolinska Institute, SE-171 77 Stockholm, Sweden.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24179227" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Apoptosis ; Astrocytes/physiology ; Axons/*physiology ; Cell Survival ; Cicatrix/*pathology ; Forkhead Transcription Factors/genetics ; Genes, ras ; Mice ; Mice, Mutant Strains ; Neural Stem Cells/*physiology ; Spinal Cord Injuries/*pathology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 82
    Publikationsdatum: 2013-11-30
    Beschreibung: Hypercholesterolemia is a risk factor for estrogen receptor (ER)-positive breast cancers and is associated with a decreased response of tumors to endocrine therapies. Here, we show that 27-hydroxycholesterol (27HC), a primary metabolite of cholesterol and an ER and liver X receptor (LXR) ligand, increases ER-dependent growth and LXR-dependent metastasis in mouse models of breast cancer. The effects of cholesterol on tumor pathology required its conversion to 27HC by the cytochrome P450 oxidase CYP27A1 and were attenuated by treatment with CYP27A1 inhibitors. In human breast cancer specimens, CYP27A1 expression levels correlated with tumor grade. In high-grade tumors, both tumor cells and tumor-associated macrophages exhibited high expression levels of the enzyme. Thus, lowering circulating cholesterol levels or interfering with its conversion to 27HC may be a useful strategy to prevent and/or treat breast cancer.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3899689/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3899689/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nelson, Erik R -- Wardell, Suzanne E -- Jasper, Jeff S -- Park, Sunghee -- Suchindran, Sunil -- Howe, Matthew K -- Carver, Nicole J -- Pillai, Ruchita V -- Sullivan, Patrick M -- Sondhi, Varun -- Umetani, Michihisa -- Geradts, Joseph -- McDonnell, Donald P -- K99CA172357/CA/NCI NIH HHS/ -- R37 DK048807/DK/NIDDK NIH HHS/ -- R37DK048807/DK/NIDDK NIH HHS/ -- T32 CA059365/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2013 Nov 29;342(6162):1094-8. doi: 10.1126/science.1241908.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC 27710, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24288332" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Breast Neoplasms/blood/*metabolism/*pathology ; Cell Line, Tumor ; Cholestanetriol 26-Monooxygenase/antagonists & inhibitors/metabolism ; Disease Models, Animal ; Female ; Humans ; Hydroxycholesterols/antagonists & inhibitors/blood/*metabolism ; Hypercholesterolemia/blood/*metabolism ; Lung Neoplasms/secondary ; Mice ; Tumor Cells, Cultured
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 83
    Publikationsdatum: 2013-08-03
    Beschreibung: Insects often undergo regular outbreaks in population density but identifying the causal mechanism for such outbreaks in any particular species has proven difficult. Here, we show that outbreak cycles in the tea tortrix Adoxophyes honmai can be explained by temperature-driven changes in system stability. Wavelet analysis of a 51-year time series spanning more than 200 outbreaks reveals a threshold in outbreak amplitude each spring when temperature exceeds 15 degrees C and a secession of outbreaks each fall as temperature decreases. This is in close agreement with our independently parameterized mathematical model that predicts the system crosses a Hopf bifurcation from stability to sustained cycles as temperature increases. These results suggest that temperature can alter system stability and provide an explanation for generation cycles in multivoltine insects.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nelson, William A -- Bjornstad, Ottar N -- Yamanaka, Takehiko -- New York, N.Y. -- Science. 2013 Aug 16;341(6147):796-9. doi: 10.1126/science.1238477. Epub 2013 Aug 1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Queen's University, Kingston, Ontario, Canada. nelsonw@queensu.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23907532" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Life Cycle Stages ; Models, Biological ; Moths/growth & development/*physiology ; Population Density ; Population Dynamics ; *Seasons ; *Temperature ; Wavelet Analysis
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  • 84
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-08-03
    Beschreibung: Whereas reward (appetitiveness) and aversiveness (punishment) have been distinguished as two discrete dimensions within psychology and behavior, physiological and computational models of their neural representation have treated them as opposite sides of a single continuous dimension of "value." Here, I show that although dopamine neurons of the primate ventral midbrain are activated by evidence for reward and suppressed by evidence against reward, they are insensitive to aversiveness. This indicates that reward and aversiveness are represented independently as two dimensions, even by neurons that are closely related to motor function. Because theory and experiment support the existence of opponent neural representations for value, the present results imply four types of value-sensitive neurons corresponding to reward-ON (dopamine), reward-OFF, aversive-ON, and aversive-OFF.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fiorillo, Christopher D -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2013 Aug 2;341(6145):546-9. doi: 10.1126/science.1238699.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Bio and Brain Engineering, KAIST (Korea Advanced Institute of Science and Technology), Yuseong-gu, Daejeon, Republic of Korea. fiorillo@kaist.ac.kr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23908236" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Appetitive Behavior/*physiology ; Conditioning, Classical/physiology ; Dopaminergic Neurons/*physiology ; Female ; Macaca mulatta ; Male ; Mesencephalon/cytology/*physiology ; Punishment/*psychology ; *Reward
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  • 85
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-12-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 2013 Dec 20;342(6165):1434-5. doi: 10.1126/science.342.6165.1434-b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24357286" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Brain/*ultrastructure ; Cell Count/methods ; Cell Membrane/chemistry ; Humans ; Imaging, Three-Dimensional/*methods ; Membrane Lipids/*chemistry ; Mice ; Neurons/chemistry/*ultrastructure ; Staining and Labeling/*methods
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  • 86
    Publikationsdatum: 2013-04-20
    Beschreibung: Recovery of overexploited marine populations has been slow, and most remain below target biomass levels. A key question is whether this is due to insufficient reductions in harvest rates or the erosion of population resilience. Using a global meta-analysis of overfished stocks, we find that resilience of those stocks subjected to moderate levels of overfishing is enhanced, not compromised, offering the possibility of swift recovery. However, prolonged intense overexploitation, especially for collapsed stocks, not only delays rebuilding but also substantially increases the uncertainty in recovery times, despite predictable influences of fishing and life history. Timely and decisive reductions in harvest rates could mitigate this uncertainty. Instead, current harvest and low biomass levels render recovery improbable for the majority of the world's depleted stocks.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Neubauer, Philipp -- Jensen, Olaf P -- Hutchings, Jeffrey A -- Baum, Julia K -- New York, N.Y. -- Science. 2013 Apr 19;340(6130):347-9. doi: 10.1126/science.1230441.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ 08901, USA. neubauer.phil@gmail.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23599493" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Biomass ; *Conservation of Natural Resources ; *Fisheries ; Fishes/*growth & development/physiology ; Population Density
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  • 87
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-12-07
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Victora, Gabriel D -- New York, N.Y. -- Science. 2013 Dec 6;342(6163):1186. doi: 10.1126/science.1247567.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24311676" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Antibodies/genetics/*immunology ; Antibody Affinity ; Antibody Formation ; Awards and Prizes ; B-Lymphocytes/*immunology ; Cell Movement ; Cell Proliferation ; *Evolution, Molecular ; Germinal Center/cytology/*immunology ; History, 21st Century ; Mice ; Mice, Transgenic ; Somatic Hypermutation, Immunoglobulin ; T-Lymphocytes, Helper-Inducer/immunology ; United States
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 88
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-12-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 2013 Dec 20;342(6165):1434-5. doi: 10.1126/science.342.6165.1434-a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24357285" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Bacterial Proteins/genetics/metabolism ; Clustered Regularly Interspaced Short Palindromic Repeats/*genetics ; DNA/genetics ; Genetic Diseases, Inborn/*surgery ; Genetic Therapy/*methods ; Humans ; Mice ; Microsurgery/*methods ; *RNA Editing ; RNA, Guide/genetics/metabolism ; Rats
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 89
    Publikationsdatum: 2013-11-23
    Beschreibung: Cyclophosphamide is one of several clinically important cancer drugs whose therapeutic efficacy is due in part to their ability to stimulate antitumor immune responses. Studying mouse models, we demonstrate that cyclophosphamide alters the composition of microbiota in the small intestine and induces the translocation of selected species of Gram-positive bacteria into secondary lymphoid organs. There, these bacteria stimulate the generation of a specific subset of "pathogenic" T helper 17 (pT(H)17) cells and memory T(H)1 immune responses. Tumor-bearing mice that were germ-free or that had been treated with antibiotics to kill Gram-positive bacteria showed a reduction in pT(H)17 responses, and their tumors were resistant to cyclophosphamide. Adoptive transfer of pT(H)17 cells partially restored the antitumor efficacy of cyclophosphamide. These results suggest that the gut microbiota help shape the anticancer immune response.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4048947/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4048947/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Viaud, Sophie -- Saccheri, Fabiana -- Mignot, Gregoire -- Yamazaki, Takahiro -- Daillere, Romain -- Hannani, Dalil -- Enot, David P -- Pfirschke, Christina -- Engblom, Camilla -- Pittet, Mikael J -- Schlitzer, Andreas -- Ginhoux, Florent -- Apetoh, Lionel -- Chachaty, Elisabeth -- Woerther, Paul-Louis -- Eberl, Gerard -- Berard, Marion -- Ecobichon, Chantal -- Clermont, Dominique -- Bizet, Chantal -- Gaboriau-Routhiau, Valerie -- Cerf-Bensussan, Nadine -- Opolon, Paule -- Yessaad, Nadia -- Vivier, Eric -- Ryffel, Bernhard -- Elson, Charles O -- Dore, Joel -- Kroemer, Guido -- Lepage, Patricia -- Boneca, Ivo Gomperts -- Ghiringhelli, Francois -- Zitvogel, Laurence -- P01 DK071176/DK/NIDDK NIH HHS/ -- P01DK071176/DK/NIDDK NIH HHS/ -- P50 CA086355/CA/NCI NIH HHS/ -- R01 AI084880/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2013 Nov 22;342(6161):971-6. doi: 10.1126/science.1240537.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut National de la Sante et de la Recherche Medicale, U1015, Equipe labellisee Ligue Nationale Contre le Cancer, Institut Gustave Roussy, Villejuif, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24264990" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adoptive Transfer ; Animals ; Anti-Bacterial Agents/administration & dosage ; Antineoplastic Agents/*therapeutic use ; Bacterial Translocation/*drug effects ; Cyclophosphamide/*therapeutic use ; Germ-Free Life ; Gram-Positive Bacteria/drug effects/physiology ; Immunologic Memory ; Immunosuppressive Agents/*therapeutic use ; Intestine, Small/*microbiology ; Lymphoid Tissue/immunology/microbiology ; Mice ; Microbiota/drug effects/*physiology ; Neoplasms/*drug therapy/*immunology ; Th17 Cells/immunology/transplantation
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  • 90
    Publikationsdatum: 2013-10-19
    Beschreibung: The chytrid fungus, Batrachochytrium dendrobatidis, causes chytridiomycosis and is a major contributor to global amphibian declines. Although amphibians have robust immune defenses, clearance of this pathogen is impaired. Because inhibition of host immunity is a common survival strategy of pathogenic fungi, we hypothesized that B. dendrobatidis evades clearance by inhibiting immune functions. We found that B. dendrobatidis cells and supernatants impaired lymphocyte proliferation and induced apoptosis; however, fungal recognition and phagocytosis by macrophages and neutrophils was not impaired. Fungal inhibitory factors were resistant to heat, acid, and protease. Their production was absent in zoospores and reduced by nikkomycin Z, suggesting that they may be components of the cell wall. Evasion of host immunity may explain why this pathogen has devastated amphibian populations worldwide.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3956111/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3956111/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fites, J Scott -- Ramsey, Jeremy P -- Holden, Whitney M -- Collier, Sarah P -- Sutherland, Danica M -- Reinert, Laura K -- Gayek, A Sophia -- Dermody, Terence S -- Aune, Thomas M -- Oswald-Richter, Kyra -- Rollins-Smith, Louise A -- 1K01HL103179-01/HL/NHLBI NIH HHS/ -- AI007281/AI/NIAID NIH HHS/ -- AI038296/AI/NIAID NIH HHS/ -- AI044924/AI/NIAID NIH HHS/ -- K01 HL103179/HL/NHLBI NIH HHS/ -- R01 AI038296/AI/NIAID NIH HHS/ -- R37 AI038296/AI/NIAID NIH HHS/ -- R56 AI044924/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2013 Oct 18;342(6156):366-9. doi: 10.1126/science.1243316.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Vanderbilt University, Nashville, TN 37235, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24136969" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Aminoglycosides/pharmacology ; Amphibians/*immunology/*microbiology ; Animals ; Apoptosis/immunology ; Cell Proliferation ; Chytridiomycota/*pathogenicity ; Host-Pathogen Interactions/*immunology ; Lymphocytes/drug effects/*immunology/*microbiology ; Mycoses/immunology/*veterinary ; Spores, Fungal/pathogenicity ; Xenopus laevis
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 91
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-12-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vafai, Scott B -- Mootha, Vamsi K -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2013 Dec 20;342(6165):1453-4. doi: 10.1126/science.1248449.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Departments of Molecular Biology and Medicine, Massachusetts General Hospital, Boston, MA 02114, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24357304" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Leigh Disease/*drug therapy ; Mitochondrial Diseases/*drug therapy ; *Molecular Targeted Therapy ; Multiprotein Complexes/*antagonists & inhibitors ; Neuroprotective Agents/*therapeutic use ; Sirolimus/*therapeutic use ; TOR Serine-Threonine Kinases/*antagonists & inhibitors
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 92
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-05-11
    Beschreibung: The possibility that market interaction may erode moral values is a long-standing, but controversial, hypothesis in the social sciences, ethics, and philosophy. To date, empirical evidence on decay of moral values through market interaction has been scarce. We present controlled experimental evidence on how market interaction changes how human subjects value harm and damage done to third parties. In the experiment, subjects decide between either saving the life of a mouse or receiving money. We compare individual decisions to those made in a bilateral and a multilateral market. In both markets, the willingness to kill the mouse is substantially higher than in individual decisions. Furthermore, in the multilateral market, prices for life deteriorate tremendously. In contrast, for morally neutral consumption choices, differences between institutions are small.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Falk, Armin -- Szech, Nora -- New York, N.Y. -- Science. 2013 May 10;340(6133):707-11. doi: 10.1126/science.1231566.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Economics and Neuroscience, University of Bonn, Bonn, Germany. armin.falk@uni-bonn.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23661753" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Commerce/*ethics ; Decision Making ; Humans ; Mice ; *Morals
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 93
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-03-23
    Beschreibung: The theories of aero- and hydrodynamics predict animal movement and device design in air and water through the computation of lift, drag, and thrust forces. Although models of terrestrial legged locomotion have focused on interactions with solid ground, many animals move on substrates that flow in response to intrusion. However, locomotor-ground interaction models on such flowable ground are often unavailable. We developed a force model for arbitrarily-shaped legs and bodies moving freely in granular media, and used this "terradynamics" to predict a small legged robot's locomotion on granular media using various leg shapes and stride frequencies. Our study reveals a complex but generic dependence of stresses in granular media on intruder depth, orientation, and movement direction and gives insight into the effects of leg morphology and kinematics on movement.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Chen -- Zhang, Tingnan -- Goldman, Daniel I -- New York, N.Y. -- Science. 2013 Mar 22;339(6126):1408-12. doi: 10.1126/science.1229163.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Physics, Georgia Institute of Technology, Atlanta, GA 30332, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23520106" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Biomechanical Phenomena ; Extremities/*physiology ; *Locomotion ; *Models, Biological ; Robotics ; Stress, Mechanical
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 94
    Publikationsdatum: 2013-05-25
    Beschreibung: Cramer et al. (Reports, 23 March 2012, p. 1503; published online 9 February 2012) demonstrated in a mouse model for Alzheimer's disease (AD) that treatment of APP/PS1DeltaE9 mice with bexarotene decreased Abeta pathology and ameliorated memory deficits. We confirm the reversal of memory deficits in APP/PS1DeltaE9 mice expressing human APOE3 or APOE4 to the levels of their nontransgenic controls and the significant decrease of interstitial fluid Abeta, but not the effects on amyloid deposition.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4086452/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4086452/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fitz, Nicholas F -- Cronican, Andrea A -- Lefterov, Iliya -- Koldamova, Radosveta -- F32AG034031/AG/NIA NIH HHS/ -- R01 AG037481/AG/NIA NIH HHS/ -- R01 AG037919/AG/NIA NIH HHS/ -- R01AG037481/AG/NIA NIH HHS/ -- R01AG037919/AG/NIA NIH HHS/ -- R21 ES021243/ES/NIEHS NIH HHS/ -- R21ES021243/ES/NIEHS NIH HHS/ -- New York, N.Y. -- Science. 2013 May 24;340(6135):924-c. doi: 10.1126/science.1235809.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Environmental and Occupational Health, University of Pittsburgh, 100 Technology Drive, Pittsburgh, PA 15219, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23704552" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Alzheimer Disease/*drug therapy/*metabolism ; Amyloid beta-Peptides/*metabolism ; Animals ; Apolipoproteins E/*metabolism ; Brain/*metabolism ; Male ; Tetrahydronaphthalenes/*pharmacology/*therapeutic use
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  • 95
    Publikationsdatum: 2013-10-05
    Beschreibung: Dominant mutations in sarcomere proteins such as the myosin heavy chains (MHC) are the leading genetic causes of human hypertrophic cardiomyopathy (HCM) and dilated cardiomyopathy. We found that expression of the HCM-causing cardiac MHC gene (Myh6) R403Q mutation in mice can be selectively silenced by an RNA interference (RNAi) cassette delivered by an adeno-associated virus vector. RNAi-transduced MHC(403/+) mice developed neither hypertrophy nor myocardial fibrosis, the pathologic manifestations of HCM, for at least 6 months. Because inhibition of HCM was achieved by only a 25% reduction in the levels of the mutant transcripts, we suggest that the variable clinical phenotype in HCM patients reflects allele-specific expression and that partial silencing of mutant transcripts may have therapeutic benefit.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4100553/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4100553/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jiang, Jianming -- Wakimoto, Hiroko -- Seidman, J G -- Seidman, Christine E -- R01 HL084553/HL/NHLBI NIH HHS/ -- R01HL084553/HL/NHLBI NIH HHS/ -- U01 HL066582/HL/NHLBI NIH HHS/ -- U01 HL098166/HL/NHLBI NIH HHS/ -- U01HL098166/HL/NHLBI NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2013 Oct 4;342(6154):111-4. doi: 10.1126/science.1236921.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24092743" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Alleles ; Animals ; Cardiomyopathy, Hypertrophic/*diagnosis/genetics/pathology ; Dependovirus ; Fibrosis ; Gene Silencing ; *Genetic Therapy ; HEK293 Cells ; Humans ; Mice ; Mutation ; Myosin Heavy Chains/*genetics ; *RNA Interference
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 96
    Publikationsdatum: 2013-04-27
    Beschreibung: Leathers and Olson (Reports, 5 October 2012, p. 132) draw the strong conclusion that neurons in the monkey lateral intraparietal (LIP) cortical area encode only cue salience, and not action value, during value-based decision-making. Although their findings regarding cue salience are interesting, their broader conclusions are problematic because (i) their primary conclusion is based on responses observed during a brief interval at the beginning of behavioral trials but is extended to all subsequent temporal epochs and (ii) the authors failed to replicate basic hallmarks of LIP physiology observed in those subsequent temporal epochs by many laboratories.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4045496/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4045496/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Newsome, William T -- Glimcher, Paul W -- Gottlieb, Jacqueline -- Lee, Daeyeol -- Platt, Michael L -- R01 MH096875/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2013 Apr 26;340(6131):430. doi: 10.1126/science.1233214.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology and Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23620037" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Cues ; Decision Making/*physiology ; Male ; Motivation/*physiology ; Neurons/*physiology ; Saccades/*physiology ; *Social Values
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 97
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-02-23
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cemma, Marija -- Brumell, John H -- New York, N.Y. -- Science. 2013 Feb 22;339(6122):912-3. doi: 10.1126/science.1235639.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cell Biology Program, Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23430642" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Caspases/*metabolism ; *Cell Death ; Cytosol/*microbiology ; Gram-Negative Bacterial Infections/*immunology ; Macrophages/*microbiology ; Vacuoles/*microbiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 98
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2013-08-21
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 2013 Aug 16;341(6147):730-1. doi: 10.1126/science.341.6147.730.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23950524" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Crops, Agricultural ; Developing Countries ; Humans ; Malaria/prevention & control ; *Pest Control/methods/statistics & numerical data ; *Pesticides/poisoning/toxicity ; Plant Weeds
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 99
    Publikationsdatum: 2013-05-21
    Beschreibung: Invasive species that proliferate after colonizing new habitats have a negative environmental and economic impact. The reason why some species become successful invaders, whereas others, even closely related species, remain noninvasive is often unclear. The harlequin ladybird Harmonia axyridis, introduced for biological pest control, has become an invader that is outcompeting indigenous ladybird species in many countries. Here, we show that Harmonia carries abundant spores of obligate parasitic microsporidia closely related to Nosema thompsoni. These microsporidia, while not harming the carrier Harmonia, are lethal pathogens for the native ladybird Coccinella septempunctata. We propose that intraguild predation, representing a major selective force among competing ladybird species, causes the infection and ultimate death of native ladybirds when they feed on microsporidia-contaminated Harmonia eggs or larvae.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vilcinskas, Andreas -- Stoecker, Kilian -- Schmidtberg, Henrike -- Rohrich, Christian R -- Vogel, Heiko -- New York, N.Y. -- Science. 2013 May 17;340(6134):862-3. doi: 10.1126/science.1234032.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Phytopathology and Applied Zoology, Heinrich-Buff-Ring 26-32, Justus-Liebig-University of Giessen, D-35392 Giessen, Germany. andreas.vilcinskas@agrar.uni-giessen.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23687046" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Beetles/*parasitology/*physiology ; *Food Chain ; Hemocytes/parasitology ; Hemolymph/parasitology ; *Introduced Species ; Nosema/*physiology/ultrastructure
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 100
    Publikationsdatum: 2013-03-16
    Beschreibung: The identification of precise mutations is required for a complete understanding of the underlying molecular and evolutionary mechanisms driving adaptive phenotypic change. Using plasticine models in the field, we show that the light coat color of deer mice that recently colonized the light-colored soil of the Nebraska Sand Hills provides a strong selective advantage against visually hunting predators. Color variation in an admixed population suggests that this light Sand Hills phenotype is composed of multiple traits. We identified distinct regions within the Agouti locus associated with each color trait and found that only haplotypes associated with light trait values have evidence of selection. Thus, local adaptation is the result of independent selection on many mutations within a single locus, each with a specific effect on an adaptive phenotype, thereby minimizing pleiotropic consequences.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3836219/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3836219/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Linnen, Catherine R -- Poh, Yu-Ping -- Peterson, Brant K -- Barrett, Rowan D H -- Larson, Joanna G -- Jensen, Jeffrey D -- Hoekstra, Hopi E -- 308796/European Research Council/International -- New York, N.Y. -- Science. 2013 Mar 15;339(6125):1312-6. doi: 10.1126/science.1233213.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, University of Kentucky, Lexington, KY 40506, USA. catherine.linnen@uky.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23493712" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adaptation, Physiological/*genetics ; Agouti Signaling Protein/genetics ; Animals ; *Biological Evolution ; Color ; Food Chain ; *Multifactorial Inheritance ; Mutation ; Organic Chemicals ; Peromyscus/genetics/*physiology ; Pigmentation/*genetics ; Selection, Genetic
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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