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  • 1
    ISSN: 1432-0983
    Keywords: Recombination ; Yeast ; radmutants ; Endo/exonuclease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Extracts of S. cerevisiae cells can catalyze homologous recombination between plasmids in vitro. Extracts prepared from rad50, rad52 or rad54 disruption mutants all have reduced recombinational activity compared to wild-type. The rad52 and rad54 extracts are more impaired in the recombination of plasmids containing double-strand breaks than of intact plasmids, whereas rad50 extracts are deficient equally for both types of substrate. The nuclease RhoNuc (previously designated yNucR), encoded by the RNC1 (previously designated NUC2) gene and regulated by the RAD52 gene, is not required for recombination when one substrate is single-stranded but is essential for the majority of recombination events when both substrates are double-stranded. Furthermore, elimination of this nuclease restores recombination in rad52 extracts to levels comparable to those in wild-type extracts.
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 440 (2006), S. 613-614 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Why is the world green? Why have grazing animals with their insatiable appetites not consumed all vegetation and reduced the land to dust? There have been hypotheses, of course, but as with many large-scale ecological problems, it has not proved easy to test any proposal with controlled ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 436 (2005), S. 35-36 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Large mammalian grazers are allies of the conservation biologist. Sharp incisors, grinding molars and selectiveness in their choice of vegetation have made sheep, cattle and horses invaluable for grassland managers concerned with enhancing diversity or encouraging particular plant species. But ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 433 (2005), S. 588-589 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The past may be a foreign country, and a pretty inaccessible one at that. But it does not deter people from exploring it. One of the objects of conservation is to retain or recreate primeval habitats, but this can only be achieved with sound knowledge of the structure and composition of past ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 427 (2004), S. 594-594 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Concern about the rising levels of carbon dioxide in the atmosphere centres on global warming. But CO2 is of course also the raw material of photosynthesis, and the growth of some plants is often limited by its relatively low ambient concentration (less than 0.04% by volume in the ...
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 374 (1995), S. 117-118 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ONE of the most insidious forms of pollution is eutrophication of natural habitats by airborne nitrogenous materials. This is an all-pervasive process; and the upshot of such aerial deposition of fixed nitrogen in the form of nitrates and ammonia may be serious ...
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 369 (1994), S. 708-709 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SAYING it with flowers is not a modern idea. Quite apart from the extensive use of flowers as symbolic items in art over many centuries, there is also evidence of floral tributes being used in graves since prehistoric times. The detective work involved is by no means straightforward. But it can ...
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 367 (1994), S. 322-323 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE so-called C4 photosynthetic mechanism equips plants with valuable competitive advantages under conditions of high light intensity, high temperature and low water availability. Their greater efficiency in trapping carbon dioxide means that they can exert a tighter control over ...
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 366 (1993), S. 515-515 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Is size a matter of importance among seeds? Maranon and Grubb1 have looked into the question as it concerns Mediterra-nean annuals and have come up with an answer-their conclusion is that big seeds equip a plant for growth in rich environ-ments. Seed size is normally a remarkably consistent ...
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 362 (1993), S. 217-218 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE renaissance of interest in global biodiversity makes a number of demands on biologists. They are required to produce much more exhaustive studies of plant and animal taxonomy, especially in the rich but understudied tropics; they must document the geographical ranges of organisms to identify ...
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