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  • Artikel  (33)
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  • American Association for the Advancement of Science (AAAS)  (26)
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  • 1
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    Fetal hemoglobin genes turned on in adults (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-12-24
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kolata, G -- New York, N.Y. -- Science. 1982 Dec 24;218(4579):1295-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6183747" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Anemia, Sickle Cell/therapy ; Azacitidine/therapeutic use ; Fetal Hemoglobin/biosynthesis/*genetics ; Hemoglobin, Sickle/biosynthesis ; Humans ; Male ; Thalassemia/therapy
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 2
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    Autocidal control of screwworms in North America (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-01-22
    Beschreibung: The larva of the blowfly Cochliomyia hominivorax, also known as the screwworm, eats the living flesh of cattle and sheep and other warm-blooded animals. A program to eradicate the screwworm in the United States was initiated in the 1950's. The program was very effective until 1968, but severe screwworm outbreaks occurred in 1972 to 1976 and in 1978. Although the program has again been effective since 1979, the possibility of outbreaks recurring in the future has highlighted the need for a broader understanding of the pest. Studies of screwworm populations in the United Stated and Mexico indicate that much of the genetic diversity of this insect is distributed among sympatric non-interbreeding populations. A new approach may be required to retain the effectiveness of the control program and to prevent a serious outbreak from threatening the economic viability of the U.S. livestock industry.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Richardson, R H -- Ellison, J R -- Averhoff, W W -- New York, N.Y. -- Science. 1982 Jan 22;215(4531):361-70.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7199204" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cattle ; Cattle Diseases/*prevention & control ; Diptera/classification/*physiology ; Ecology ; Infertility, Male ; Insect Control/methods ; Karyotyping ; Male ; Myiasis/*prevention & control ; North America ; Pest Control, Biological/*methods ; Reproduction ; Screw Worm Infection/*prevention & control
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 3
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    Agricultural research and Third World food production (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-07-16
    Beschreibung: By the close of this century the world may have to feed as many as 2 billion additional people. Most of them will be born in developing countries, especially in marginal lands ill-suited for food production. This article focuses on efforts by the International Agricultural Research Centers to increase food production in the Third World and addresses the social and ecological issues raised by the introduction of high-yielding varieties into fertile Third World lands and describe how varieties are being tailored for introduction into marginal areas.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Plucknett, D L -- Smith, N J -- New York, N.Y. -- Science. 1982 Jul 16;217(4556):215-20.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089555" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Agriculture ; *Developing Countries ; Ecology ; *Food Supply ; Humans ; *Research
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 4
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    Manipulation of event-related potential manifestations of information processing stages (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-11-26
    Beschreibung: The timing of two event-related potential components was differentially affected by two experimental variables. The earlier component (NA) was affected by degradation of the stimuli and the later component (N2) by the nature of a classification task. The results support the hypothesis that NA and N2 reflect sequential stages of information processing, namely, pattern recognition and stimulus classification.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ritter, W -- Simson, R -- Vaughan, H G Jr -- Macht, M -- HD 10804/HD/NICHD NIH HHS/ -- IF32 AGO-5193/AG/NIA NIH HHS/ -- MH 06723/MH/NIMH NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1982 Nov 26;218(4575):909-11.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7134983" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Action Potentials ; Adult ; Brain/*physiology ; Brain Mapping ; Cognition/*physiology ; Discrimination (Psychology)/physiology ; Evoked Potentials ; Humans ; Information Theory ; Perception/*physiology ; Time Factors
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 5
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    Subperiosteal expansion and cortical remodeling of the human femur and tibia with aging (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-09-03
    Beschreibung: Increases with aging in subperiosteal dimensions and second moments of area (measures of bending and torsional rigidity) in femoral and tibial cross sections are documented in an archeological sample from the American Southwest. Significant differences between cross-sectional sites and between sexes in the pattern of cortical remodeling with age are also present. These differences appear to be related to variations in the stress or strain levels in different regions of the femur and tibia which result from in vivo mechanical loadings of the lower limb.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ruff, C B -- Hayes, W C -- AM00749/AM/NIADDK NIH HHS/ -- AM26740/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1982 Sep 3;217(4563):945-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7112107" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; *Aging ; Bone Development ; Female ; Femur/*physiology ; Fractures, Bone/etiology ; Growth ; Humans ; Male ; Middle Aged ; Periosteum/*physiology ; Physical Exertion ; Sex Characteristics ; Stress, Mechanical ; Tibia/*physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 6
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    Wound tissue can utilize a polymeric template to synthesize a functional extension of skin (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-01-08
    Beschreibung: Prompt and long-term closure of full-thickness skin wounds is guinea pigs and humans is achieved by applying a bilayer polymeric membrane. The membrane comprises a top layer of a silicone elastomer and a bottom layer of a porous cross-linked network of collagen and glycosaminoglycan. The bottom layer can be seeded with a small number of autologous basal cells before grafting. No immunosuppression is used and infection, exudation, and rejection are absent. Host tissue utilizes the sterile membrane as a culture medium to synthesize neoepidermal and neodermal tissue. A functional extension of skin over the entire wound area is formed in about 4 weeks.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yannas, I V -- Burke, J F -- Orgill, D P -- Skrabut, E M -- GM 21700/GM/NIGMS NIH HHS/ -- GM 23946/GM/NIGMS NIH HHS/ -- HL 14322/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1982 Jan 8;215(4529):174-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7031899" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adolescent ; Adult ; Animals ; Burns/*therapy ; Cells, Cultured ; Child ; Child, Preschool ; Collagen/therapeutic use ; Female ; Glycosaminoglycans/therapeutic use ; Guinea Pigs ; Humans ; Male ; Middle Aged ; Silicone Elastomers/therapeutic use ; *Skin Transplantation ; *Wound Healing
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 7
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    Rotating shift work schedules that disrupt sleep are improved by applying circadian principles (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-07-30
    Beschreibung: Workers on rotating shifts dislike those aspects of their work schedules that violate circadian sleep-wake cycle physiology. Work schedule satisfaction, subjective health estimates, personnel turnover, and worker productivity improve when schedules are introduced that are designed to incorporate circadian principles.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Czeisler, C A -- Moore-Ede, M C -- Coleman, R H -- New York, N.Y. -- Science. 1982 Jul 30;217(4558):460-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089576" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Activity Cycles ; Adult ; Aged ; *Circadian Rhythm ; Health ; Humans ; Job Satisfaction ; Male ; Middle Aged ; *Sleep ; *Work
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 8
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    Decreased insulin receptors but normal glucose metabolism in Duchenne muscular dystrophy (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-04-16
    Beschreibung: Compared to matched controls, 17 patients with Duchenne muscular dystrophy showed decreased insulin binding to monocytes due to decreased receptor concentration. These patients showed no signs of altered glucose metabolism and retrospective analysis of the clinical records of a further 56 such patients revealed no modification in carbohydrate metabolism. These data suggest that reduced insulin receptor number does not produce overt modifications of glucose metabolism in Duchenne muscular dystrophy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉DePirro, R -- Lauro, R -- Testa, I -- Ferretti, I -- De Martinis, C -- Dellatonio, R -- New York, N.Y. -- Science. 1982 Apr 16;216(4543):311-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7063889" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adolescent ; Adult ; Cell Membrane/metabolism ; Child ; Glucose/*metabolism ; Humans ; Monocytes/metabolism ; Muscular Dystrophies/*metabolism ; Receptor, Insulin/*metabolism
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 9
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    Lipofuscin: resolution of discrepant fluorescence data (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-05-14
    Beschreibung: Lipofuscin granules (age pigments) emit yellow light under ultraviolet excitation in the fluorescence microscope. The reported blue emission maximum of extracts of lipofuscin-laden cells may result from instrumental bias. The major fluorescent components that accumulate with age in these lysosomal residual bodies of human retinal pigment epithelium are yellow-emitting fluorophores. Different age-related fluorophores, which do emit blue light, are derived from other intracellular sources. A reevaluation of the connection between blue-emitting lipid peroxidation products and the age-related lipofuscin granules of classical pathology is necessary.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eldred, G E -- Miller, G V -- Stark, W S -- Feeney-Burns, L -- EY 03274/EY/NEI NIH HHS/ -- EY 03408/EY/NEI NIH HHS/ -- EY 05456/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1982 May 14;216(4547):757-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7079738" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Age Factors ; Cytoplasmic Granules ; Humans ; *Lipofuscin ; Lysosomes/analysis ; Pigment Epithelium of Eye/analysis/ultrastructure ; *Pigments, Biological ; Spectrometry, Fluorescence ; Spectrum Analysis
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 10
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    A new treatment for burn victims (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-08-06
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Maugh, T H 2nd -- New York, N.Y. -- Science. 1982 Aug 6;217(4559):522.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089578" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adolescent ; Adult ; *Bandages ; *Biological Dressings ; Burns/*therapy ; Cells, Cultured ; Child ; Child, Preschool ; Epidermis/cytology ; Humans ; Surgical Flaps ; Wound Healing
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 11
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    A new marker for diabetes (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-02-05
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Maugh, T H 2nd -- New York, N.Y. -- Science. 1982 Feb 5;215(4533):651.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7058330" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adipose Tissue/pathology ; Adult ; Diabetes Mellitus/*pathology ; Female ; Humans ; Male ; *Obesity ; Sex Factors
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 12
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    Calcium and age in fibroblasts from control subjects and patients with cystic fibrosis (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-04-23
    Beschreibung: Intracellular calcium increases significantly as human fibroblasts age in culture. The calcium increase occurs 5 to 6 weeks (passages) earlier and is significantly greater in fibroblasts from subjects with cystic fibrosis in comparison with cells from control subjects. Intracellular calcium, which is thought to be a pathogenetic factor in cystic fibrosis, may also be a meaningful marker in cell aging.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shapiro, B L -- Lam, L F -- AG-02114/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 1982 Apr 23;216(4544):417-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7071590" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adolescent ; Adult ; Calcium/*metabolism ; *Cell Survival ; Cells, Cultured ; Child ; Cystic Fibrosis/*metabolism/pathology ; Female ; Fibroblasts ; Humans ; Infant ; Male
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 13
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    Luteal phase defects induced by an agonist of luteinizing hormone-releasing factor: a model for fertility control (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-01-08
    Beschreibung: Subcutaneous injection of 50 micrograms of a luteinizing hormone-releasing factor agonist (LRF agonist) for three successive days at the time of menstruation in normal cycling women induces a shortened luteal phase with suboptimal concentrations of circulating estradiol and progesterone. This luteal phase defect follows a reduced concentration of follicle-stimulating hormone during the follicular phase and a resulting inadequate follicular maturation. Since a short luteal phase is associated with an endometrium not conductive to implantation, administration of the LRF agonist at the onset of menstrual cycle may prove to be a practical and novel approach to fertility control.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sheehan, K L -- Casper, R F -- Yen, S S -- HD-12303/HD/NICHD NIH HHS/ -- N01HD-92842/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1982 Jan 8;215(4529):170-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6797068" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; *Contraception ; Estradiol/blood ; Female ; Follicle Stimulating Hormone/blood/metabolism ; Gonadotropin-Releasing Hormone/*analogs & derivatives/pharmacology ; Humans ; Luteinizing Hormone/blood ; Menstruation/drug effects ; Progesterone/blood ; *Triptorelin Pamoate/*analogs & derivatives
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 14
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    Diazepam impairs lateral position control in highway driving (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-07-02
    Beschreibung: Nine expert drivers operated an instrumented vehicle in tests over a highway at night after being treated with diazepam (5 and 10 milligrams), a placebo, and nothing. They reacted to 10 milligrams of diazepam with increased lateral position variability. Potentially dangerous impairment was inferred from the reactions of some subjects.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉O'Hanlon, J F -- Haak, T W -- Blaauw, G J -- Riemersma, J B -- New York, N.Y. -- Science. 1982 Jul 2;217(4554):79-81.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089544" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; *Automobile Driving ; Diazepam/*pharmacology ; Dose-Response Relationship, Drug ; Double-Blind Method ; Functional Laterality ; Humans ; Male ; Motor Activity/*drug effects ; Placebos
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 15
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    Familial renal cell carcinoma with a 3;11 chromosome translocation limited to tumor cells (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-09-03
    Beschreibung: Cytogenic studies were performed on the direct chromosome preparations of the renal cell carcinoma cells and the cultured peripheral blood lymphocytes of a patient with familial renal cell carcinoma. The results revealed a specific, acquired translocations (3p;11p) present in the majority of metaphases of the tumor, indicating that the development of renal cell carcinoma is associated with a deletion in the proximal end of 3p. Renal cell carcinoma is thus the third example--the first two being retinoblastoma and Wilms' tumor--of a chromosomal deletion occurring germinally or somatically in association with a specific tumor. This finding adds further support to the existence of specific human cancer genes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pathak, S -- Strong, L C -- Ferrell, R E -- Trindade, A -- CA 27925/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1982 Sep 3;217(4563):939-41.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7112106" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adenocarcinoma/*genetics ; Adult ; Chromosome Banding ; Chromosomes, Human, 1-3/*ultrastructure ; Chromosomes, Human, 6-12 and X/*ultrastructure ; Female ; Humans ; Karyotyping ; Kidney Neoplasms/*genetics ; Lymphocytes/ultrastructure ; Male ; Pedigree ; *Translocation, Genetic
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 16
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    Use of "Super-plus" tampons discouraged (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-06-18
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sun, M -- New York, N.Y. -- Science. 1982 Jun 18;216(4552):1300.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6281894" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Centers for Disease Control and Prevention (U.S.) ; Female ; Humans ; *Menstruation ; Shock, Septic/*etiology ; Tampons, Surgical/*adverse effects ; United States
    Print ISSN: 0036-8075
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 17
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    Bronchoconstrictor effects of leukotriene C in humans (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-04-09
    Beschreibung: Maximum expiratory flow rate at 30 percent of vital capacity above residual volume served as an index of airway obstruction in comparing the effects of leukotriene C and histamine administered by aerosol to five normal persons. Leukotriene C was 600 to 9500 times more potent than histamine on a molar basis in producing an equivalent decrement in the residual volume. The leukotriene C response was slow in onset and prolonged, reminiscent of the effects of aerosol allergen challenge in asthmatic allergic subjects.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weiss, J W -- Drazen, J M -- Coles, N -- McFadden, E R Jr -- Weller, P F -- Corey, E J -- Lewis, R A -- Austen, K F -- AI-00399/AI/NIAID NIH HHS/ -- AI-07722/AI/NIAID NIH HHS/ -- AI-10356/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1982 Apr 9;216(4542):196-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7063880" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Airway Resistance/*drug effects ; Bronchi/*drug effects ; Dose-Response Relationship, Drug ; Female ; Histamine/pharmacology ; Humans ; Male ; Middle Aged ; Prostaglandins F/pharmacology ; SRS-A/*pharmacology ; Time Factors
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 18
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    Simulating amnesic symptoms in normal subjects (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-12-17
    Beschreibung: Patients with organic brain damage resulting in anterograde amnesia cannot recall a list of words, but when given the first three letters of each word, they complete these word stems with words from the list. We simulated this phenomenon in normal subjects who examined the list words for vowels while ignoring their semantic component. The subjects produced the list words when completing the word stems although they could not recall the words.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Graf, P -- Mandler, G -- Haden, P E -- New York, N.Y. -- Science. 1982 Dec 17;218(4578):1243-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7146909" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Amnesia/*physiopathology ; Humans ; Memory/*physiology ; Mental Recall/physiology ; Models, Biological
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 19
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    Depo-Provera debate revs up at FDA (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-07-30
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sun, M -- New York, N.Y. -- Science. 1982 Jul 30;217(4558):424-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6211767" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Animals ; Carcinogens ; Contraceptive Agents, Female ; Dogs ; Drug Evaluation ; Drug Evaluation, Preclinical ; Female ; Humans ; International Agencies ; Medroxyprogesterone/adverse effects/*analogs & derivatives/pharmacology ; Medroxyprogesterone Acetate ; Risk ; United States ; United States Food and Drug Administration
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 20
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    Excretion of beta-phenethylamine is elevated in humans after profound stress (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-02-26
    Beschreibung: The urinary excretion rate of the endogenous, amphetamine-like substance beta-phenethylamine was markedly elevated in human subjects in association with an initial parachuting experience. The increases were delayed in most subjects and were not correlated with changes in urinary pH or creatinine excretion. The data suggest a stress-related role for beta-phenethylamine.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Paulos, M A -- Tessel, R E -- DA-01614/DA/NIDA NIH HHS/ -- GM-27430/GM/NIGMS NIH HHS/ -- RR-05606/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1982 Feb 26;215(4536):1127-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7063846" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adolescent ; Adult ; *Aerospace Medicine ; Creatinine/urine ; Female ; Humans ; Male ; Phenethylamines/*urine ; Stress, Physiological/*urine ; Time Factors
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 21
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    The cholinergic hypothesis of geriatric memory dysfunction (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-07-30
    Beschreibung: Biochemical, electrophysiological, and pharmacological evidence supporting a role for cholinergic dysfunction in age-related memory disturbances is critically reviewed. An attempt has been made to identify pseudoissues, resolve certain controversies, and clarify misconceptions that have occurred in the literature. Significant cholinergic dysfunctions occur in the aged and demented central nervous system, relationships between these changes and loss of memory exist, similar memory deficits can be artificially induced by blocking cholinergic mechanisms in young subjects, and under certain tightly controlled conditions reliable memory improvements in aged subjects can be achieved after cholinergic stimulation. Conventional attempts to reduce memory impairments in clinical trials hav not been therapeutically successful, however. Possible explanations for these disappointments are given and directions for future laboratory and clinical studies are suggested.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bartus, R T -- Dean, R L 3rd -- Beer, B -- Lippa, A S -- New York, N.Y. -- Science. 1982 Jul 30;217(4558):408-14.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7046051" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acetylcholine/metabolism ; Adult ; Aged ; Aging ; Alzheimer Disease/physiopathology ; Animals ; Brain Chemistry ; Choline/metabolism ; Choline O-Acetyltransferase/metabolism ; Cognition ; Forecasting ; Humans ; Memory/drug effects ; Memory Disorders/*physiopathology ; Mice ; *Models, Neurological ; Parasympathetic Nervous System/*physiopathology ; Parasympathomimetics/pharmacology ; Phosphatidylcholines/metabolism ; Rats ; Receptors, Muscarinic/metabolism
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 22
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    Sex and handedness differences in cerebral blood flow during rest and cognitive activity (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-08-13
    Beschreibung: Cognitive activity resulted in increased flow of blood to the cerebral hemispheres. The increase was greater to the left hemisphere for a verbal task and greater to the right hemisphere for a spatial task. The direction and degree of hemispheric flow asymmetry were influenced by sex and handedness, females having a higher rate of blood flow per unit weight of brain, and females and left-handers having a greater percentage of fast-clearing tissue, presumably gray matter.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gur, R C -- Gur, R E -- Obrist, W D -- Hungerbuhler, J P -- Younkin, D -- Rosen, A D -- Skolnick, B E -- Reivich, M -- MH 30456/MH/NIMH NIH HHS/ -- NS-10939-09/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1982 Aug 13;217(4560):659-61.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089587" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adolescent ; Adult ; Brain/metabolism/*physiology ; *Cerebrovascular Circulation ; *Cognition ; Female ; *Functional Laterality ; Humans ; Male ; Metabolic Clearance Rate ; Rest ; *Sex Characteristics
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 23
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    Reduced sympathetic nervous system responsivity associated with the relaxation response (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-01-08
    Beschreibung: Sympathetic nervous system activity was assessed in experimental and control subjects who were exposed to graded orthostatic and isometric stress during monthly hospital visits. After the first session, the experimental subjects practiced a technique that elicited the relaxation response. Their concentrations of plasma norepinephrine during subsequent graded stresses were significantly higher. No such changes were noted in the control group. These results were than replicated in the control group in a crossover experiment. The groups did not differ in their heart rate and blood pressure responses. These observations are consistent with reduced norepinephrine end-organ responsivity after regular elicitation of the relaxation response.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hoffman, J W -- Benson, H -- Arns, P A -- Stainbrook, G L -- Landsberg, G L -- Young, J B -- Gill, A -- HL-07374/HL/NHLBI NIH HHS/ -- HL-22727/HL/NHLBI NIH HHS/ -- HL-24084/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1982 Jan 8;215(4529):190-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7031901" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Blood Pressure ; Female ; Heart Rate ; Humans ; Male ; *Muscle Contraction ; *Muscle Relaxation ; Norepinephrine/blood ; *Relaxation Therapy ; Stress, Physiological/physiopathology ; Sympathetic Nervous System/*physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 24
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    Monkey and human pictorial memory scanning (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-06-18
    Beschreibung: A rhesus monkey accurately recognized pictures in a Sternberg memory scanning experiment. When the monkey was tested with pictures that were reused during the same session, the monkey's performance was nearly identical to that of a human subject; this result demonstrates the monkeys are capable of some of the short-term retrieval mechanisms of humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sands, S F -- Wright, A A -- EY-01256/EY/NEI NIH HHS/ -- MH35202/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1982 Jun 18;216(4552):1333-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7079768" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Animals ; Female ; Humans ; Macaca mulatta ; Male ; Memory/*physiology ; Species Specificity ; Time Factors ; *Visual Perception
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 25
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    Tritiated imipramine binding sites are decreased in the frontal cortex of suicides (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-06-18
    Beschreibung: Binding characteristics of tritiated imipramine were determined in the frontal cortex of suicides and well-matched controls. Maximal binding was significantly lower in brains from the suicides. This finding is consistent with reports of decreased tritiated imipramine binding in the platelets of patients diagnosed as having a major affective disorder.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stanley, M -- Virgilio, J -- Gershon, S -- New York, N.Y. -- Science. 1982 Jun 18;216(4552):1337-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7079769" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adolescent ; Adult ; *Carrier Proteins ; Cerebral Cortex/*metabolism ; Humans ; Imipramine/*metabolism ; Kinetics ; Middle Aged ; Receptors, Drug/*metabolism ; Reference Values ; *Suicide ; Tritium
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 26
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    Decreased nocturnal plasma melatonin peak in patients with estrogen receptor positive breast cancer (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-05-28
    Beschreibung: Plasma melatonin concentrations were determined over a period of 24 hours in 20 women with clinical stage I or II breast cancer. In ten of the patients, whose tumors were estrogen receptor positive, the nocturnal increase in plasma melatonin was much lower than that observed in eight control subjects. Women with the lowest peak concentration of melatonin had tumors with the highest concentrations of estrogen receptors. A significant correlation was found between the peak plasma melatonin concentration and the tumor estrogen receptor concentration in 19 of the patients. These data suggest that low nocturnal melatonin concentrations may indicate the presence of estrogen receptor positive breast cancer and could conceivably have etiologic significance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tamarkin, L -- Danforth, D -- Lichter, A -- DeMoss, E -- Cohen, M -- Chabner, B -- Lippman, M -- New York, N.Y. -- Science. 1982 May 28;216(4549):1003-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7079745" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Aged ; Breast Neoplasms/*blood/metabolism/physiopathology ; *Circadian Rhythm ; Humans ; Melatonin/*blood ; Middle Aged ; Pineal Gland/*physiopathology ; Receptors, Estrogen/*metabolism
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 27
    Digitale Medien
    Digitale Medien
    Photosynthetic metabolism in the cyanophytaOscillatoria rubescens D.C. (1982)
    Springer
    Archives of microbiology 131 (1982), S. 107-111 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Cyanophyta ; Cyanobacteria ; Oscillatoria rubescens ; Photosynthetic pathways ; Photosynthetic enzymes ; Ecology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Short term14C labelling experiments and enzymatic activities related to primary pathways of photosynthesis have been studied in the cyanophytaOscillatoria rubescens D.C. from axenic cyclostat cultures. Responses of samples from cultures with different amounts of nitrogen are presented and compared. Variations in photosynthetic pigments are used to quantify the degree of nitrogen starvation at different levels. PEPcarboxylase activity remains low and is not affected by nitrogen starvation. RuBPcarboxylase activity is lowered to nearly two thirds of its normal metabolic rate by starvation but PEPcarboxykinase and aspartate aminotransferase activities are significantly higher in this case. Malate dehydrogenase is slightly altered and malic enzyme is never active. Starved algae replaced in fresh complete media fix rapidly14C in nitrogen compounds such as amino acids. Results are discussed in regard to both physiological and ecological characteristics ofO. rubescens. PEPcarboxykinase can play a role in making efficient use of HCO 3 - .
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01053990
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  • 28
    Digitale Medien
    Digitale Medien
    Dynamics ofOstrya carpinifolia woods in the Southern Alps (N-Italy) (1982)
    Springer
    Plant ecology 48 (1982), S. 123-131 
    Details
    ISSN: 1573-5052
    Schlagwort(e): Ecology ; Fringe communities ; Numerical classification ; Ostrya carpinifolia woods ; Phytogeographic elements ; Phytosociology ; Southern Alps (N-Italy) ; Vegetation dynamics ; Wood edge communities
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Forest regeneration in the vegetation complex of the submontane belt in the Southern Alps involves the active participation ofOstrya carpinifolia woods and their wood edge communities. The corresponding syndynamical processes are described by employing phytosociological, phytogeographical and ecological methods. It is concluded that: (i) The communities of the grassland-wood transition are of major importance in the successional developments in this man-made vegetation complex. (ii) Many species occurring in the region of the deciduous forests of Eurasia find their refuge in such transitional communities and are supposed to play an important part in the succession. (iii) Ostrya carpinifolia is considered as an early successional tree species.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00726880
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  • 29
    Digitale Medien
    Digitale Medien
    Frankia growth and activity as influenced by water potential (1982)
    Springer
    Plant and soil 69 (1982), S. 293-297 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Ecology ; Frankia ; Nitrogen fixation ; Water potential
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Growth responses of Frankia isolates to decreasing water potential were monitored in systems where potentials were controlled by KCl, NaCl and Polyethylene glycol. The highest potential tested was −2 bar (basal medium). The general pattern emerging was that isolates fromAlnus glutinosa, A. viridis andComptonia peregrina showed declining growth at potentials below −2 to −5 bar. AMyrica gale isolate showed declining growth with decreasing potential. All isolates were more sensitive to decreases in potential in a matric controlled than an osmotic controlled system. They all showed approximately 50 percent growth reduction at −5 to −8 bar, and meagre growth at −16 bar after 35 days. The Comptonia isolate was the most vigorous at low potentials. Nitrogen fixation ability was monitored for two isolates. Highest specific activities were observed between −3 and −5 bar for the Myrica isolate and between −5 and −7.5 bar for theA. glutinosa isolate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02374525
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  • 30
    Digitale Medien
    Digitale Medien
    Effects of crop rotation and fertilization on catalase activity in a soil of the southeastern United States (1982)
    Springer
    Plant and soil 69 (1982), S. 97-104 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Catalase ; Ecology ; Fertilizers ; H2O2∶H2O2 oxidoreductase ; Rhizosphere effects ; Soil enzymes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Catalase activity of a loamy sand under a 3-year crop rotation in the southeastern U.S.A. was monitored. Corn (Zea mays L.), cotton (Gossypium hirsutum L.), and soybean [Glycine max (L.) Merr.] were the summer crops in the rotation. Winter wheat (Triticum aestivum L.) was planted after corn, and soybean was followed by a winter fallow period. Cotton was followed by a mixture of common vetch (Vicia sativa L.) and crimson clover (Trifolium incarnatum Gibelli & Belli) which was eventually plow-incorporated as a green manure. Highest mean catalase activities were recorded in soil under the wheat, soybean, and winter legume crops; lowest activities were found in soil bearing corn and cotton, and during the winter fallow period. The fertilization regime influenced soil catalase activity independently of the crop. Soil deficient in any of the major elements showed low enzyme activity. Highest activity was found in soil fertilized with P and K, and with N supplied by a winter legume crop. Addition of supplementary mineral nitrogen to this regime reduced catalase activity. Elimination of the winter legume crop from an otherwise complete fertilization regime resulted in a drastic reduction in enzyme activity. In soil receiving a complete fertilization regime there was a close correlation between soil catalase and xylanase activities. A similar correlation between these two enzymes was not found in soil receiving incomplete fertilization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02185708
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  • 31
    Digitale Medien
    Digitale Medien
    Thermoregulatory behavior and diel activity of yearling winter flounder, Pseudopleuronectes americanus (Walbaum) (1982)
    Springer
    Environmental biology of fishes 7 (1982), S. 177-180 
    Details
    ISSN: 1573-5133
    Schlagwort(e): Temperature ; Behavior ; Ecology ; Fisheries ; Fish ; Marine juveniles
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Synopsis Sixteen yearling winter flounder, tested individually for 3-day periods in electronic shuttleboxes, voluntarily occupied an 8–27°C range of temperature, with a modal final thermal preferendum of 18.5°C (mean 18.7°C, median 19°C, midpoint 17.5°C, s.d. 1.9°C, S k + 0.33). The locomotor activity pattern of the yearling fish in the laboratory was markedly nocturnal, with mean hourly nocturnal activity exceeding mean hourly diurnal activity by a factor of 3.4. Maximum activity occurred at 0300 EST, minimum activity at 1400 EST. While activity generally increased with temperature, a local activity minimum occurred at 18.7°C, coinciding with the 24-hour mean final thermal preferendum. Comparison of these laboratory data with previously published field data suggest that behavioral responses to temperature and light play significant roles in determining age- and size-specific differences in seasonal depth stratification and onshore-offshore distributions in this species.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00001789
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  • 32
    Digitale Medien
    Digitale Medien
    Patterns of abundance variation in reef fishes near an artificial reef at Guam (1982)
    Springer
    Environmental biology of fishes 7 (1982), S. 121-136 
    Details
    ISSN: 1573-5133
    Schlagwort(e): Seasonality ; Predator-prey ; Predator interference ; Turnoverrate ; Diversity ; Ecology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Synopsis Development of the fish community on a submerged 16 m barge and variation in fish abundance on nearby transects were surveyed twice monthly for twenty months. A steady increase in abundance was observed for certain fishes on the barge, whereas a few species exhibited distinct seasonal variation on both the barge and transects. Most of the seasonal species settled between March and May. Some seasonal species appeared to be site selective in their settlement and consequently settled juveniles were clumped in their distribution. An abundance of preferred topographical features may be why settlement was relatively high at the study site and indirectly why predators became significantly (r3 = 7.67***, N = 37) more abundant at the study area during the months of maximum prey settlement. Concurrent settlement of several species during the same few months may be important because juveniles become an abundant food source to predators during those few months only. Periodic swamping of predators by abundant juvenile prey may improve the chances for individuals of rarer prey species to be overlooked and therefore be succesfully recruited.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00001782
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  • 33
    Digitale Medien
    Digitale Medien
    Biology of the southern brook lamprey,Ichthyomyzon gagei (1982)
    Springer
    Environmental biology of fishes 7 (1982), S. 305-320 
    Details
    ISSN: 1573-5133
    Schlagwort(e): Adult ; Ammocoetes ; Fecundity ; Growth ; Metamorphosis ; Morphometrics ; Spawning ; Temperature ; Cyclostomata ; Petromyzoniformes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Synopsis Larval, metamorphosing and adult representatives of the southern brook lamprey,Ichthyomyzon gagei, were collected from Choclafaula Creek in Alabama to provide information on aspects of its life cycle. The proportional length of the prebranchial, branchial, trunk and tail regions changed throughout larval life in a pattern similar to that demonstrated in other lampreys. Body depth changed also throughout much of larval life. Oral disc, dorsal fin height, and eye diameter increased through all or most of metamorphosis and the adult interval. Length-frequency curves for larvae indicate a larval life of 3 1/4–4 1/4 years. Growth rate, reflected by change in total length, was constant throughout the year for each age group. Sex ratio of larvalI. gagei was 1♂: 1.02♀. Metamorphosis is initiated in early September and is completed between early February and mid March. Adult 1. gagei spawn between mid April and early May. The number of oocytes ranged from 820–2485 between 95–150 mm total length. The maximum gonadosomic ratio in males was 17.1 and 26.3% in females.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00005566
    Standort Signatur Erwartet Verfügbarkeit
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