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  • Biology
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  • 2020-2022
  • 1980-1984  (6)
  • 1975-1979
  • 1981  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Versuche zum periodischen Verhalten vonBiomphalaria glabrata (1981)
    Springer
    Parasitology research 64 (1981), S. 217-231 
    Details
    ISSN: 1432-1955
    Keywords: Biomphalaria glabrata ; Biology ; Periodic Phenomena ; Laboratory Technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Es wurde eine Methode zur Langzeitmessung der lokomotorischen Aktivität vonBiomphalaria glabrata entwickelt. Eine mit einer Co57-Quelle markierte Schnecke bewegt sich in einer Kreisbahn. Unter dem Versuchsbehälter rotiert eine Bleischeibe mit Schlitz (1 Umdrehung/min) über einem Großflächenzählrohr. Einmal pro Minute fällt die emittierte Radioaktivität durch den Schlitz auf das Zählrohr. Über die Impulsabstände wird die Position und daraus die lokomotorische Aktivität der Schnecke bestimmt. Unter konstanten Bedingungen ergibt sich in den anschließenden Versuchen sowohl bei mitSchistosoma mansoni infizierten als auch bei nicht infizierten Versuchstieren eine periodische Verteilung der Laufaktivität über den Tag. Die Schnecken zeigen tagsüber mehr lokomotorische Aktivität als nachts — mit einem deutlichen Maximum in der zweiten Stunde nach Lichtbeginn. Fütterungsexperimente mit J125-Fibrinogen-markiertem Futter ergeben nachts dreimal höhere Freßaktivität als am Tage. Durch eigene Versuche kann bestätigt werden, daß auch die Eiablage beiB. glabrata bevorzugt nachts stattfindet. Die Ergebnisse werden mit anderen bereits bekannten periodischen Phänomenen beiB. glabrata in einer Phasenkarte zusammengefaßt.
    Notes: Abstract A method was developed to measure the locomotive activity ofBiomphalaria glabrata over long periods of time. A snail, radioactively marked with a Co57-source, moves on a circular path. Beneath the experimental vessel a lead disc with a slit revolves (one revolution per minute) over a counter tube. Once every minute the amount of radioactivity emitted falls through the slit onto the counter tube. The position and thence the locomotive activity of the snail is determined from the intervals between the impulses. Under constant conditions the experiments show a distribution of crawling activity over the whole day that is the same for animals infected withSchistosoma mansoni and non-infected molluscs. The snails have more locomotive activity by day than by night, with a distinct maximum in the second hour after exposure to light. Experiments using food marked with I125-labelled fibrinogen revealed that feeding activity is three times as high at night as by day. The experiments also show thatBiomphalaria glabrata tends to prefer night-time for egg laying. The results are compared with other known periodic phenomena inB. glabrata in a phase-chart.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00930499
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  • 2
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    Chemical triggering of reproduction in Microtus montanus (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-10-02
    Description: In a replicated experiment, nonbreeding winter populations of Microtus montanus were given supplements of rolled oats coated with 6-methoxybenzoxazolinone, a naturally occurring plant derivative. After 3 weeks of this feeding regime, samples from the populations demonstrated a high incidence of pregnancy in females and testicular hypertrophy in males. Control populations receiving rolled oats coated only with the solvent showed no reproductive activity. These results demonstrate that the presence of 6-methoxybenzoxazolinone in the plant food resource acts as the ultimate cue to trigger reproductive effort in Microtus montanus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Berger, P J -- Negus, N C -- Sanders, E H -- Gardner, P D -- RR-07092/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1981 Oct 2;214(4516):69-70.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7025210" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arvicolinae/*physiology ; Benzoxazoles/*pharmacology ; Diet ; Environment ; Female ; Male ; Plants ; Reproduction/*drug effects ; Seasons
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    6-methoxybenzoxazolinone: a plant derivative that stimulates reproduction in Microtus montanus (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-10-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sanders, E H -- Gardner, P D -- Berger, P J -- Negus, N C -- New York, N.Y. -- Science. 1981 Oct 2;214(4516):67-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7025209" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arvicolinae/*physiology ; Benzoxazoles/*pharmacology ; Diet ; Environment ; Gas Chromatography-Mass Spectrometry ; Plants ; Reproduction/*drug effects ; Seasons ; Stimulation, Chemical
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Research in EPA: A congressional point of view (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-03-27
    Description: From lessons learned in several years of overseeing the research programs of the Environmental Protection Agency, the authors conclude that the agency should give more support to the accumulation of the scientific "intellectual capital" needed for managing the environment in the long term.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brown, G E Jr -- Byerly, R Jr -- New York, N.Y. -- Science. 1981 Mar 27;211(4489):1385-90.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7466395" target="_blank"〉PubMed〈/a〉
    Keywords: Environment ; *Government Agencies ; *Research ; Research Support as Topic ; United States
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Microbial competition (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-08-28
    Description: Populations of microorganisms inhabiting a common environment complete for nutrients and other resources of the environment. In some cases, the populations even excrete into the environment chemicals that are toxic or inhibitory to their competitors. Competition between two populations tends to eliminate one of the populations from their common habitat, especially when competition is focused on a single resource and when the populations do not otherwise interact. However, a number of factors mitigate the severity of competition and thus competitors often coexist.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fredrickson, A G -- Stephanopoulos, G -- New York, N.Y. -- Science. 1981 Aug 28;213(4511):972-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7268409" target="_blank"〉PubMed〈/a〉
    Keywords: *Bacterial Physiological Phenomena ; Ecology ; Energy Metabolism ; Environment ; Eukaryota/*physiology ; Growth ; Population Dynamics ; Yeasts/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Regulation of cutaneous previtamin D3 photosynthesis in man: skin pigment is not an essential regulator (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-02-06
    Description: When human skin was exposed to simulated solar ultraviolet radiation, epidermal 7-dehydrocholesterol was converted to previtamin D3. During prolonged exposure to simulated solar ultraviolet radiation, the synthesis of previtamin D3 reached a plateau at about 10 to 15 percent of the original 7-dehydrocholesterol content, and previtamin D3 was photoisomerized to two biologically inert isomers, lumisterol3 and tachysterol3. Increases either in skin melanin concentration or in latitude necessitated increases in the exposure time to simulated solar ultraviolet radiation required to maximize the formation, but not the total content, of previtamin D3. In order of importance, the significant determinants limiting the cutaneous production of previtamin D3 are (i) photochemical regulation, (ii) pigmentation, and (iii) latitude.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Holick, M F -- MacLaughlin, J A -- Doppelt, S H -- AM25395-01/AM/NIADDK NIH HHS/ -- R01-AM27334-01/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1981 Feb 6;211(4482):590-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6256855" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/metabolism ; Cholecalciferol/*biosynthesis/metabolism ; Dehydrocholesterols/metabolism ; Dose-Response Relationship, Radiation ; Environment ; Ergosterol/metabolism ; Humans ; In Vitro Techniques ; Photochemistry ; Rats ; Skin/*radiation effects ; Skin Pigmentation ; Sunlight ; Ultraviolet Rays
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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