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  • 11
    Electronic Resource
    Electronic Resource
    Freemartins in Sheep (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 1754-1755 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Owen3 and Owen et al.4 have reported that most dizygotic twin calves are red blood-cell chimaeras. They are born with, and often retain throughout life, red cells of dual origin. The same authors argued that since the life of red cells is short, red-cell precursors must be exchanged between the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1821754b0
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  • 12
    Electronic Resource
    Electronic Resource
    Ignition of Methane-Air Mixtures by Rapid Compression (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 543-544 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In recent experiments we have improved our original method in which the compression ratio of the motored engine was increased to approach the ignition boundary. A machine of fixed compression ratio of 14-7 : 1 is now used with an accurately controlled preheat charge temperature. The charge ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173543a0
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  • 13
    Electronic Resource
    Electronic Resource
    Ignition of Methane–Air Mixtures by Rapid Compression (1951)
    [s.l.] : Nature Publishing Group
    Nature 167 (1951), S. 191-192 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The earlier experiments of Prettre1, using a flow technique in a heated tube, indicated that, unlike the higher hydrocarbons, methane exhibited no distinct 'cool flame' region ; but he recorded that there was luminescence 30-40 C. below the temperature of final ignition. The experiments of Townend ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/167191a0
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  • 14
    Electronic Resource
    Electronic Resource
    Population Density and Atypical Behaviour in Male Odonata (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 503-504 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] (1) The upper limit of population density (the highest steady density) of males by water is determined by the behaviour of the insects themselves. The number of insects per unit area of water edge differs from species to species, but each has a characteristic highest steady density. (2) Male ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/194503a0
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  • 15
    Electronic Resource
    Electronic Resource
    Œstrous and Ovarian Response of the Ewe to a Horse Anterior Pituitary Extract (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 1283-1284 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In recent work2, carried out in the autumns of 1960 and 1961, in which large numbers of fertilized eggs were required, merino ewes were treated with a horse anterior pituitary extract prepared from frozen anterior pituitaries. The frozen pituitaries were finely ground and then homogenized in a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1941283a0
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  • 16
    Electronic Resource
    Electronic Resource
    Editorial
    Amsterdam : Elsevier
    International Information & Library Review 24 (1992), S. 1 
    Details
    ISSN: 1057-2317
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Information Science and Librarianship
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S1057-2317(05)80020-7
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  • 17
    Electronic Resource
    Electronic Resource
    Ultrahigh efficiency microwave signal transmission using tandem-contact single quantum well GaAlAs lasers (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 936-938 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show theoretically and experimentally that enhancements of up to 40 dB in the efficiency of optical transmission of microwave signals can be obtained by using a single quantum well laser transmitter whose contact is segmented into two sections, and modulation is applied to one of the sections. The improvement is dependent fundamentally on the relaxation oscillation frequency of the device, with the improvement factor dropping to around 15 dB at relaxation oscillation frequencies approaching 10 GHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101729
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  • 18
    Electronic Resource
    Electronic Resource
    Organic Chlorine Insecticide Residues in Wild Birds (1964)
    [s.l.] : Nature Publishing Group
    Nature 201 (1964), S. 1072-1073 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DECLINES in reproductive success and population numbers of certain predatory birds have coincided in space and time with the use of organic chlorine insecticides1,2. Accordingly, a nation-wide survey of residues of these substances in wild birds was undertaken. 85 bird corpses and 72 eggs were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2011072a0
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  • 19
    Electronic Resource
    Electronic Resource
    Organochlorine Insecticide Residues in the Eggs of Sea Birds (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 42-43 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN 1963, organochlorine insecticide residues were found in the eggs of terns and other species feeding in British waters1'2. In 1964, the survey was extended to include specimens from 13 species collected at four sites. A preliminary examination of residues in the food of the birds at one site was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/207042a0
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  • 20
    Electronic Resource
    Electronic Resource
    Homogeneous repair of nuclear genes after experimental stroke (2002)
    Oxford, UK : Blackwell Science, Ltd
    Journal of neurochemistry 80 (2002), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The repair of oxidative DNA lesions (ODLs) in the nucleus of ischemic cortical brain cells was examined following experimentally induced stroke by occluding the right middle cerebral artery and both common carotid arteries for 60–90 min followed by reperfusion in male long-Evans hooded rats. The control group consisted of sham-operated animals undergoing the same surgery without vessel occlusion. Using a gene-specific assay based upon the presence of Escherichia coli Fpg protein-sensitive sites, we noted that animals with stroke exhibited six and four ODLs per gene in the actin and DNA polymerase-β genes, respectively. This was increased from one per four copies of each gene in the sham-operated control (p 〈 0.01). One half of the initial ODLs was repaired within 30 min, and 83% of them were repaired as early as 45 min of reperfusion. There was no further increase when gene repair was measured again at 2 h of reperfusion. The rates of active repair within 45 min of reperfusion were the same in these two genes (p = 0.103, anova). BrdU (10 mg/kg) was administered via intraperitoneal injection at least one day before surgery. We observed that there was no significant incorporation of BrdU triphosphates into genomic DNA during active repair, but there were significant amounts of BrdU triphosphate in nuclear DNA after active repair. The result indicates that genomic repair of ODLs in the brain did not significantly incorporate BrdU, and the initiation of neurogenesis probably starts after the completion of repair in the brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0022-3042.2001.00680.x
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