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  • Articles  (35)
  • Medicine  (31)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (4)
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  • Articles  (35)
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  • 1
    Electronic Resource
    Electronic Resource
    Degradation of Cellulosic Fibres in Contact with Rusting Iron (1957)
    [s.l.] : Nature Publishing Group
    Nature 180 (1957), S. 1065-1065 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] An explanation of the cause of this degradation follows from consideration of the generally accepted electrochemical mechanism for the corrosion of iron wetted with a neutral salt solution. According to this mechanism, a flow of current occurs between separate regions of differing potential on the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1801065a0
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  • 2
    Electronic Resource
    Electronic Resource
    A Brain Extract as a Substitute for Platelet Suspensions in the Thromboplastin Generation Test (1954)
    [s.l.] : Nature Publishing Group
    Nature 174 (1954), S. 880-881 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A standard human brain thromboplastin, prepared by acetone drying, is further washed with acetone until free of cholesterol, as judged by a negative Liebermann-Burchardt reaction. When 1 gm. of the dried powder is extracted at room temperature with approximately 50 ml. of chloroform, more than 300 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/174880a0
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  • 3
    Electronic Resource
    Electronic Resource
    Coagulation Mechanism of the Horse (1955)
    [s.l.] : Nature Publishing Group
    Nature 175 (1955), S. 596-597 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Using the thromboplastin generation test1, the prolonged clotting time was found to be due to a deficiency of antihsemophilic globulin, and this defect was present in both sexes. The deficiency was corrected by normal human plasma. This finding may well prove a most useful tool for those ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/175596a0
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  • 4
    Electronic Resource
    Electronic Resource
    Catalytic Effects in the Alkaline Oxidation of Cellulose (1960)
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 963-964 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A more direct demonstration of a large catalytic effect at fairly high alkali concentration is provided by the results in Fig. 1, which shows the variation of the initial rate of oxygen consumption of jute fibre at 60 C. with the iron content of the fibre. The natural iron, content of jute fibre is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/186963b0
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  • 5
    Electronic Resource
    Electronic Resource
    Action of Hydroxyurea on Multiplication of Influenza Virus in Mammalian Cells (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 646-647 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In 1961 Wong and Kilbourne9 described a clone of a morphological variant of Chang's conjunctival cell which supported the complete growth of influenza virus. These cells (clone l-5c-4), grown in 60 15 mm Petri dishes10, were used throughout our investigations. Influenza A /NWS adapted to this cell ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/217646a0
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  • 6
    Electronic Resource
    Electronic Resource
    Haemoglobin Variants in a Species of Wild Mice— Peromyscus maniculatus (1966)
    [s.l.] : Nature Publishing Group
    Nature 210 (1966), S. 1063-1064 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In a sub-species of the white-footed deer mouse, Peromyscus maniculatus rufinus, three highly significant morphological differences were found in haematological studies. These mice were trapped alive from two distinct ecological and geographical locations, one from an area at Gothic, Colorado, at ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2101063a0
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  • 7
    Electronic Resource
    Electronic Resource
    Biotin chemoresponse in Paramecium (1998)
    Springer
    Journal of comparative physiology 183 (1998), S. 361-366 
    Details
    ISSN: 1432-1351
    Keywords: Key wordsParamecium ; Chemoattractant ; Biotin ; Chemoreceptor ; Chemokinesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Paramecium tetraurelia locate their␣foodsource by detecting bacterial metabolites and altering swimming behavior to congregate near bacterial populations on which they feed. Several attractants, such as folate, glutamate, cAMP and acetate have been identified and various aspects of chemoreception, signal transduction and effector mechanisms have been described. Here we characterize the Paramecium chemoresponse to biotin. An essential enzymatic cofactor in all cells, biotin is secreted by a large number of bacterial species during growth phase. P. tetraurelia are strongly attracted to biotin with a half-maximal behavioral response at 0.3 mmol · 1−1 in T-maze assays. Physiological recordings from whole cells show that cells hyperpolarize in a concentration-dependent manner in biotin. Whole-cell binding assays utilizing 3H-biotin identify a saturable and specific binding site with an apparent dissociation constant of 0.4 mmol · l−1. The biotin analogs desthiobiotin and biotin methyl ester are also strong attractants. Diaminobiotin fails to attract P. tetraurelia at 1 mmol · l−1, but does interfere with the biotin chemoresponse and displaces 3H-biotin from whole cells. We hypothesize that the keto group and/or fidelity of the ureido ring of biotin are necessary for biotin chemoresponse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050262
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  • 8
    Electronic Resource
    Electronic Resource
    Failure of ascorbic acid to influence brain catecholamines in the guinea-pig (1979)
    Springer
    Cellular and molecular life sciences 35 (1979), S. 515-515 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Lack of dietary ascorbic acid lowered plasma levels of ascorbic acid but failed to change levels of brain norepinephrine or dopamine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01922740
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  • 9
    Electronic Resource
    Electronic Resource
    Seed coat structure and dormancy (1992)
    Springer
    Plant growth regulation 11 (1992), S. 201-209 
    Details
    ISSN: 1573-5087
    Keywords: Seed coat structure ; dormancy ; permeability ; Dichrostachys cinerea ; natural dormancy-breaking factors ; inhibitors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract An understanding of dormancy mechanisms is of ecological and economic importance. Identification of the level at which dormancy is imposed appears to be species specific. The variation brought about by this therefore requires that developmental studies be included in seed coat dormancy experiments. In most cases, a site of permeability can be identified during the developmental process, and this information can be utilized later to remove dormancy. Under natural conditions, the removal of seed coat dormancy requires the interaction of a number of ecological and physiological dormancy-breaking cues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024559
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  • 10
    Electronic Resource
    Electronic Resource
    The role of natural agents in the removal of coat-imposed dormancy in Dichrostachys cinerea (L.) Wight et Arn. seeds (1994)
    Springer
    Plant growth regulation 14 (1994), S. 51-59 
    Details
    ISSN: 1573-5087
    Keywords: bush encroachment ; Dichrostachys cinerea ; dormancy ; germination ; impermeability ; natural factors ; seed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstracts Dichrostachys cinerea seeds are impermeable to water and do not germinate readily. The plant, however, contributes to a bush encroachment problem, minimising visibility in wildlife reserves and reducing the area available for grazing. Natural dormancy-breaking conditions must therefore exist, promoting the germinability of these normally dormant seeds. Diurnal temperature fluctuations (50°C/15°C), especially when combined with moisture were found to break dormancy. High temperatures, such as those generated by fire, destroyed seeds. Seeds ingested by herbivorous browsers such as nyala, became permeable. Seed burial for 48 weeks, was a more effective treatment than storage in promoting permeability. Distribution of D. cinerea will therefore be restricted to areas in which these conditions or factors occur. Seeds germinated optimally at 30δC in the laboratory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024141
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