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  • Life and Medical Sciences
  • 1980-1984
  • 1970-1974  (38)
  • 1950-1954
  • 1940-1944  (6)
  • 1973  (22)
  • 1970  (16)
  • 1941  (6)
Collection
Keywords
Publisher
Years
  • 1980-1984
  • 1970-1974  (38)
  • 1950-1954
  • 1940-1944  (6)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Stereotaxic map of the muscle fibers in the indirect flight muscles of Drosophila melanogaster (1973)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 140 (1973), S. 153-158 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: It is possible to monitor the electrical activity of the motor neurons of Drosophila by recording the electrical activity of the muscle fibers. We have found that it is possible to specify the location of the subcuticular terminations and to describe the orientation within the thorax for the individual muscle fibers, because of the large size of the fibers and because the surface anatomy of Drosophila is known in detail. A map has been made to indicate the location of the muscle fibers with respect to superficial landmarks. The importance of the stereotaxic map for physiological studies is discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051400203
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  • 2
    Electronic Resource
    Electronic Resource
    The structure and polysaccharide cytochemistry of the jelly envelopes of the egg of the frog, Rana pipiensSubmitted in partial fulfillment of the requirements for the Master of Science degree at Louisiana State University at Baton Rouge by J. H. Steinke. (1970)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 130 (1970), S. 57-65 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The structure and polysaccharide constitution of the jelly capsule of the egg of Rana pipiens is described. Microscopic examination of the jelly capsule revealed the presence of five discrete jelly layers that differed clearly in their response to selected cytochemical tests. These layers were classified as M1-through M5 from the inner to the outermost layer. A sixth layer occasionally could be observed between M3 and M4.All layers contain neutral mucopolysaccharides. In addition layers M1 and M3 contain sulphated mucopolysaccharides, M2 and M4 contain non-sulphated acid mucopolysaccharides, and layer M5 contains both sulphated and non-sulphated acid mucopolysaccharides. M2 may also contain a small quantity of sulphated mucopolysaccharides. The layer that occasionally appears between M3 and M4 is probably an area in which free acidic groups are in higher concentration than in adjacent areas rather than being a discrete jelly layer. Neither hyaluronic acid nor sialic acid was localized by the methods employed.The possible significance of some of these constituents is discussed.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051300107
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  • 3
    Electronic Resource
    Electronic Resource
    Reproduction, reproductive organs, and meiosis in the bisexual non-parthenogenetic mite Caloglyphus mycophagus, with reference to oocyte degeneration in virgins (Sarcoptiformes: Acaridae)This paper formed one part of a thesis presented to the Graduate School of the Medical College of Virginia in partial fulfillment of the requirements for the degree of Doctor of Philosophy. (1970)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 130 (1970), S. 93-102 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Meiosis is described in virgin females, inseminated females and males of the acarid mite Caloglyphus mycophagus (Megnin). The observed sex determining mechanism is an XO-type with the male having a diploid chromosome number of 15. Oogenesis in mated females is regular. Pachytene is the earliest meiotic stage which is readily identifiable. At metaphase I eight bivalents are observed. Both products of the first maturation division divide at the second maturation division. After the fusion of the pronuclei either 15 or 16 chromosomes are observed in cleaving eggs.Nurse cells are not observed during the growth period of the oocyte. Such oocytes are attached to a central structure of the ovary by a cone-shaped organelle. At this stage the nucleus appears as a germinal vesicle; a nucleolus is present and the diffuse chromatin appears to extend from the nucleolus to the nuclear membrane. Nuclear extrusion bodies can be seen adjacent to the nuclear membrane both within and outside of the nucleus.Virgin females do not oviposit. The aberrant morphology and behavior of bivalents in post diakinetic oocytes which have not been penetrated by a sperm are described. Neither chromatin nor a chorion could be demonstrated in aberrant oocytes situated in the oviduct. It is suggested that oocyte degeneration in virgins is an adaptive feature in an animal order in which parthenogenesis is the more common mode of reproduction.
    Additional Material: 30 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051300109
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  • 4
    Electronic Resource
    Electronic Resource
    A light and electron microscopic study of the heart of a crayfish, Procambarus clarkii (giraud). I. histology and histochemistrySupported by N.I.H. grant 5T1-GM-793 and by research grants HE-6100 and HE-2490 from the United States Public Health Service. (1970)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 131 (1970), S. 237-252 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The adventitia of the crayfish heart consists of about five layers of uninucleated cells that often contain large amounts of glycogen. The outer and inner boundaries of the adventitia are represented by amorphous, homogeneous layers that are rich in neutral and acidic carbohydrates.The myocardium has a trabeculated appearance, due to the branching and anastomosing of the muscle cells. Studies on the localization of various oxidative enzymes show that the mitochondria are contained principally in the cell periphery and the myofibrils in the cell core. Intercalated discs appear as dark, irregular lines that traverse the muscle cell at a level that corresponds to that of a Z band. The myocardial cells branch and radiate from loci that are formed either by a single stellate cell or by the common end-to-end junctions (intercalated discs) of several cells. The function of these loci is discussed.The local cardiac nervous system consists of a Y-shaped ganglionic trunk that contains eight large anterior and eight small posterior nerve cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051310302
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  • 5
    Electronic Resource
    Electronic Resource
    The ultrastructure of the pygidial defence glands of the carabid Pterostichus madidus F (1970)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 131 (1970), S. 397-415 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Pygidial defence glands, which are universal in Caraboidea, are paired, cuticular invaginations of the body wall.In Pterostichus madidus F. the glands contain a nauseous, corrosive secretion that can be discharged forcibly to deter attack by predators. The cells producing the secretion are of one type only. Electronmicroscopy shows that the ducts which drain these cells are not intracellular but are separated from the cell contents by a plasma membrane. The cuticular walls of the duct appear to effectively screen the cell from the disruptive effect of its final products of secretion. The duct-carrying epidermal cells which are modifications of the epidermis covering the rest of the gland support the ducts from the secretory vesicles to their entry into the central lumen of each secretory lobe. There is a single duct-carrying cell around each duct.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051310404
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  • 6
    Electronic Resource
    Electronic Resource
    An electron microscopic study of the spermathecal complex of virgin aedes Aegypti mosquitoesThe opinions or assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the Department of the Army or the Department of Defense. (1970)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 132 (1970), S. 293-311 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Virgin mosquitoes were studied with the electron microscope. Spermathecal duct walls contain cuticle, epithelium, and a richly innervated spiral muscle; myocytes are linked by desmosome-like attachment plaques to the underlying epithelium. Periductal cells along upper portions of the ducts have a large secretory droplet within a highly irregular extracellular lacuna and are attached to a long secretory ductule through which finely granular material is delivered to the duct lumen and this enters the spermathecae. Basal gland cells of spermathecae have short ductules containing secretion in virgins. Secretory material in spermathecae of virgins does not form a complete internal membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051320305
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  • 7
    Electronic Resource
    Electronic Resource
    Gross and microscopic morphology of the Glandula proctodealis (foam gland) of Coturnix c. japonica (Aves)Michigan Agricultural Experiment Station Journal Article 5948. (1973)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 141 (1973), S. 171-184 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The dorsal proctodeal wall of the Coturnix contains a gland which is especially well-developed in the sexually active male and which secretes a foamy exudate. This gland has not been recorded in any other genus of birds and appears to be unique to members of the genus Coturnix. On the basis of its location in the adult we have named this gland the proctodeal gland (glandula proctodealis). Structure of the gland does not conform to any curently defined category of glands because it is an aggregate of individual glandular units each of which opens independently into the proctodeal cavity but with the entire structure enclosed by a connective tissue capsule. We have thus characterized it as an aggregate gland. Observations on the arrangement and composition of the fibrous capsule and its intimate relationship to the perimysium of M. sphincter cloacae indicate that release of the secretion probably results from contraction of the cloacal musculature. Preliminary data suggest that development of glandular tissue in the female may be a function of age rather than of androgen sensitivity which characterizes the male gland. It is concluded that the chemical nature of the glandular secretion and its function in the sexually active bird, as based on presently available information, remains unknown.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051410205
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  • 8
    Electronic Resource
    Electronic Resource
    The fine structure of the trout blastoderm, Salvelinus fontinalis (Mitchill) (1970)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 130 (1970), S. 367-383 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The Speckled Trout blastoderm at the late high blastula stage is characterized by two different cell populations. The “light” blastomeres comprise one cell type while the “dark” and “medium” blastomeres appear to differ from one another only in degree and thus may be considered as the second type.“Dark” and “medium” blastomeres are irregular in shape, are located centrally and deep in the blastoderm, have an abundance of smooth endoplasmic reticulum with associated 520 Å glycogen particles and a single mitochondrial profile. The “light” blastomeres have randomly arranged glycogen particles in minimal quantities in contrast to the “medium” and “dark” blastomeres and in addition exhibit three mitochondrial profiles, which could however represent artifacts.It is postulated that in the Speckled Trout cellular differentiation has commenced by the third day of incubation at 10°C and that this is manifested visually by the appearance of two different cell populations; the more differentiated “dark” and “medium” blastomeres possibly destined to give rise to the hypoblast and the less differentiated “light” blastomeres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051300308
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  • 9
    Electronic Resource
    Electronic Resource
    Studies on hereditary congenital baldness in the domestic fowl. I. Embryological and physiological bases of the character (1941)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 69 (1941), S. 517-535 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1050690307
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  • 10
    Electronic Resource
    Electronic Resource
    Ultrastructure of human labial salivary glands. III. Myoepithelium and ducts (1970)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 130 (1970), S. 227-245 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Myoepithelial cells were present between the basal lamina and the acinar secretory cells of human labial salivary glands. In form and disposition, they resembled myoepithelial cells in the major salivary glands. Many of these cells possessed single cilia on their upper surfaces. Such cilia occasionally extended into invaginations of the overlying secretory cell.The intercalated ducts were variable in occurrence. Their epithelium ranged from columnar to squamous, and showed few signs of secretory activity.Few intralobular ducts possessed basal striations. While mitochondria were abundant in non-striated cells, they were randomly disposed in both basal and apical cytoplasm, and the basal plasmalemma showed only occasional infoldings. The paucity of true striated ducts in labial salivary glands may be responsible for the high concentration of sodium and chloride in unstimulated labial gland salivary secretions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051300208
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