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  • 1
    Electronic Resource
    Electronic Resource
    Gene Duplication and the Evolution of Enzymes (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 1125-1130 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The relationship between structure and function of proteins makes it unlikely that a new enzyme activity can evolve unless the genome contains extra DNA with suitable coding properties such as is provided by the duplication of a gene for a functionally related enzyme. Evidence from the Annelida ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2171125a0
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  • 2
    Electronic Resource
    Electronic Resource
    A Factor in the Serum of Tumour-bearing Rats which is Deleterious to Cells in Tissue Culture (1963)
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 196-197 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] S.C.K.I is a squamous cell kidney carcinoma which arose spontaneously in 'John's' isogenic strain of rats. The tumour is regularly transplanted subcutaneously in these rats and up to the time of writing has been through 23 transfers. Primary cultures of the tumour were grown in a lactalbumin ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/197196a0
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  • 3
    Electronic Resource
    Electronic Resource
    Time of Feeding in Relation to the Toxicity of a Stomach Poison to the Desert Locust (1960)
    [s.l.] : Nature Publishing Group
    Nature 185 (1960), S. 335-336 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] When insects are fed with poisons applied by methods (for example, the poisoned sandwich method) other than those utilizing a poisoned medium there are usually time intervals between removal of the insects from their normal food, consumption of the poison, and resumption of normal feeding. In ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/185335b0
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  • 4
    Electronic Resource
    Electronic Resource
    Seasonal and Tidal Fluctuations in the Trawl Catches from the Sierra Leone River Estuary (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 1748-1749 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] An analysis of the results of the catch shows that over the whole period of the experiments, from March 1958 until January 1959, an average of 51 per cent of the catch per haul was marked, 33 per cent of the markable fish died during the trawling operation and 16 per cent were unmarkable fish such ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1831748a0
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  • 5
    Electronic Resource
    Electronic Resource
    The Saw-Fish of Sierra Leone (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 961-962 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] According to Copley1, Pristis pectinatus and Pristis peroteti regularly ascend quite a long way up the Sherbro River when the river is in flood, and return to the sea on the falling of the waters. Whether this is a spawning migration has not yet been confirmed. The same species have also been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/182961a0
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  • 6
    Electronic Resource
    Electronic Resource
    Thermocline off the Coast of Tropical West Africa (1958)
    [s.l.] : Nature Publishing Group
    Nature 181 (1958), S. 863-864 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During the course of the hydrographic survey, a number of bathythermograph recordings were made at stations distributed in transects at various intervals along the West African shelf. Salinity samples were also taken using a Nansen Peterssen insulated water-bottle. The results of the survey were in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/181863b0
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  • 7
    Electronic Resource
    Electronic Resource
    Natural Cross-Pollination in Lettuce, Lactuca sativa L. (1958)
    [s.l.] : Nature Publishing Group
    Nature 181 (1958), S. 1084-1084 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Two varieties were planted in each of four plots, these consisting of 15 rows of 11 plants, the odd rows and alternate plants in the even rows being of a pig-mented variety, while the remaining plants were of an unpigmented variety. Each unpigmented plant was thus surrounded by 8 pigmented ones. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1811084a0
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  • 8
    Electronic Resource
    Electronic Resource
    Etch Pits on Calcite Cleavage Faces (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 314-314 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Rhombohedral crystals, freshly cleaved from a large block of natural calcite, were etched and examined on each face in turn. Etching was carried out in 1 per cent nitric acid, after which the crystals were washed with distilled water, ethanol and carbon tetrachloride, and dried. Etching times ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/183314a0
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  • 9
    Electronic Resource
    Electronic Resource
    Estimation of Zinc in Biological Specimens: Determination of Zinc-65 (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 348-349 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THERE is evidence that zinc is necessary for animals and plants; but information about the physiological role of this metal is scant. The enzyme csCrbonic anhydrase, present in red blood cells and certain other tissues, contains zinc as an integral part of the protein molecule1; but little is known ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173348a0
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  • 10
    Electronic Resource
    Electronic Resource
    Estimation of Zinc in Biological Specimens: Separation of Radioactive Zinc from Cyclotron-irradiated Copper (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 349-349 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE chemieal separation of radioactive zinc of very high specific activity from cyclotron-irradiated copper usually presents considerable practical difficulties on account of the minute amounts of total zinc which have to be separated from relatively large amounts of copper. In the method ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173349a0
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