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  • Articles  (4,532)
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  • Oxford University Press  (345)
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  • 1960-1964
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  • 1950-1954  (4,532)
  • 1954  (4,532)
  • Biology  (4,532)
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  • Articles  (4,532)
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  • 2020-2024
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  • 1960-1964
  • 1955-1959
  • 1950-1954  (4,532)
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  • 1
    Electronic Resource
    Electronic Resource
    Der Verlauf der endogenen Tagesrhythmik bei photo-periodisehen Storlieht-Versuchen mit Soja (1954)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 7 (1954), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Es wird bei Soja mit Hilfe der tagesperiodischen Blattbewegungen der Verlauf der endogenen Tagesrbytbmik unter Licht-Dunkel-Zyklen untersucht, die denen In Wareings Experimenten entsprechen.Bei den langen Dunkel-Periodeu zwischen 39–51 Stunden Dauer, die mit Haupt-Lichtperioden von 6 oder 9 Stunden alternieren, tritt etwa 20 Stunden nach deren Beginn eine Dunkelstarre ein. Die nächste Lichtperiode induziert erneut eine nicht mehr als etwa 30 Stunden andauenide Rhythmik, der dann wieder eine Dunkelstarre folgt.Störlicht von 30 Minuten Dauer hat während der Zeit, in der die Rhythmik läuft, einen relativ geringen Einfluß auf den Zeitpunkt von Hebung und Senkung. Wirkt es aber wäbrend der Dunkelstarre, so bedingl es ebenso wie eine Haupt-Lichtperiode einen neuen Start der endogenen Tagesrhythmik.Aus diesen Befunden lassen sich die Ergebnisse Wareings über die Wirkung des zu verschiedenen Zeiten der Duukelperiode gebotenen Störlichts erklären.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1954.tb07599.x
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  • 2
    Electronic Resource
    Electronic Resource
    Steady State versus Equilibrium Thermodynamics in the Concept of “Active” Water Absorption (1954)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 7 (1954), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1954.tb07603.x
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  • 3
    Electronic Resource
    Electronic Resource
    Indoleacetic Acid Induced Change B in Uronide Fractions and Growth of Excised Tobacco Pith Tissue (1954)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 7 (1954), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1954.tb07570.x
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  • 4
    Electronic Resource
    Electronic Resource
    The Effect of 6-Aminoundecane and Di-n-Amylacetic Acid on the Water Absorption, Suction Potential and Permeability of Plant Parenchymes (1954)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 7 (1954), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1954.tb07572.x
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  • 5
    Electronic Resource
    Electronic Resource
    Studies in Carotenogenesis. Some Observations on Carotenoid Synthesis in Two Varieties of Euglena gracilis. (1954)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 1 (1954), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Euglena gracilis v. bacillaris and E. gracilis v. fuscopunctata produce the same three carotenoids, β-carotene, lutein and neoxanthin in approximately the same relative amounts. Lutein is the major pigment and β-carotene represents about 10–15% of the total. The concentration of carotenoids in E. gracilis v. bacillaris is very high, reaching 700 mg./100 g. dry weight.Streptomycin (0.02%, w/v) and darkness reduced growth of E. gracilis v. bacillaris by about 50% and carotenoid synthesis by about twenty times. Diphenylamine (1/70,000) reduced growth and carotenoid synthesis equally (about 50%). In no case was the synthesis of more saturated polyenes (the phytofluene series) stimulated.The nature of the eye spot pigment is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1954.tb00820.x
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  • 6
    Electronic Resource
    Electronic Resource
    The Infection of Duck and Goose Erythrocytes by the Mammalian Malaria Parasite, Plasmodium berghei (1954)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 1 (1954), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The infection of mice and baby rats by both Plasmodium lophurae, an avian parasite, and Plasmodium berghei, a mammalian malaria parasite, prompted investigation of the likelihood of P. berghei infecting avian erythrocytes. Though erythrocytes of chick embryos were not infected, those of the goose and duck embryos were. In both these cells the morphology of the parasite was markedly different from that seen in mammalian erythrocytes. Infections were transitory and it was impossible to find parasites after 4 days. Examination of the hosts of both species of parasites showed a rather wide range and examination of the susceptibility of the duck erythrocyte indicated that this cell was peculiarly receptive to infection by a variety of plasmodia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1954.tb00807.x
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  • 7
    Electronic Resource
    Electronic Resource
    Transfaunation Studies on the Host Specificity of the Enteric Protozoa of Rodents (1954)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 1 (1954), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Breeding colonies of protozoa-free laboratory rats (Rattus norvegicus) and golden hamsters (Mesocricetus auratus) were established by early weaning or by drug treatment. Attempts were made to transfaunate the enteric protozoa of various rodents to protozoa-free progeny of these colonies. Efforts to transfer the fauna of guinea pigs (Cavia porcellus) to rats and hamsters have failed and indicate that this fauna is physiologically isolated as well as morphologically distinct from that of other laboratory rodents. The faunas of rats and hamsters appear to be morphologically identical and freely interchangeable. That certain of the species found in rats and hamsters also occur in the mouse (Mus musculus) is indicated by successful transfaunations: mouse to rat and hamster. The suggestion is made that the fauna of the mouse and rat is indigenous but that the fauna of laboratory hamsters may have been acquired since domestication. Hexamastix muris from Neotoma fuscipes and Trichomonas microti from Microtus pennsylvanicus have been transfaunated to rats. Other enteric protozoa from these hosts and also from Marmota monax and Dipodomys merriami have not established themselves in rats and, if morphological differences cannot be found, should be considered biological races of their counterparts in the fauna of laboratory rodents.Species of lumen-dwelling enteric protozoa should be based upon morphological distinctions and not upon host specificity. The latter, as demonstrated by these experiments, is not rigidly determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1954.tb00821.x
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  • 8
    Electronic Resource
    Electronic Resource
    Mutations in Astasia longa Induced by Radiation (1954)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 1 (1954), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: About 3,000 clones of Astasia longa J, a colorless protozoan flagellate, were available for testing for biochemical mutations. Each clone was derived from a single flagellate which had been exposed to either ultraviolet or X-radiation and which had been cultured subsequent to irradiation in a complete medium. To test for biochemical mutations, an attempt was made to grow each clone in the minimal medium that suffices for the parent strain. Some clones were incapable of continuous growth in complete medium, others failed to grow or grew slowly in minimal medium, and still others grew abnormally in minimal medium when first tested but later reverted back to normal. These results are compared with those reported for various fungi and certain tentative conclusions made regarding gene mutations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1954.tb00810.x
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  • 9
    Electronic Resource
    Electronic Resource
    Trichodina myicola n. sp., a Peritrichous Ciliate from the Marine Bivalve Mya arenaria L. (1954)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 1 (1954), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A new ciliate from the marine clam Mya arenaria is described and figured. The form is designated Trichodina myicola with specific characters as follows: Bell-shaped to discoidal; length 31–86 microns; diam. 62–103 microns; diam. denticulate ring 29–46 microns; 26–36 denticles; diam. of basal disk 42–79 microns; adoral ciliary spiral performs slightly more than one turn; posterior ciliature in three closely applied, concentric tiers: an anterior circlet of marginal cilia, a middle circlet of overlapping membranelles, and a posterior circlet of inner cilia; macronucleus C-shaped; micronucleus small, round, lying near outer curvature of left arm of macronucleus; large contractile vacuole present near end of left arm of macronucleus.Taxonomy in the genus Trichodina is discussed and outlined. Special attention is given to details of the oral ciliature. T. myicola is compared with other members of the genus. A checklist of Trichodina species is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1954.tb00808.x
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  • 10
    Electronic Resource
    Electronic Resource
    Feeding Processes in Solenophrya micraster Penard 1914 (1954)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 1 (1954), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The feeding processes of Salenophrya micraster were studied and described in relation to the apparent selection of acceptable live prey ciliates, the feeding time in relation to the number of tentacles operative, and the contractile vacuole rate during feeding and subsequent reproduction. On the basis of these observations, the fundamental mechanisms involved in the suctorian feeding process are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1954.tb00812.x
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