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  • 1
    Digitale Medien
    Digitale Medien
    Leaching of Pseudomonas aeruginosa, and transconjugants containing pR68.45 through unsaturated, intact soil columns (1993)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 13 (1993), S. 0 
    Details
    ISSN: 1574-6941
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract Leaching of genetically engineered microbes (GEMs) through soil is a significant concern related to groundwater quality. The objective of this study was to examine the leaching, survival and gene transfer of a genetically engineered microbe and indigenous recipients of pR68.45 in nonsterile, undisturbed soil columns. Pseudomonas aeruginosa PAO25, containing the plasmid R68.45, was added to the surface of undisturbed soil columns (10 cm diameter × 80 cm length). Unsaturated flow conditions were maintained by 100 ml daily additions of 2 mM CaCl2 for a period of 70 days. The population of the GEM exhibited a significant (P = 0.05) linear decline with time. The GEM leached only to a depth of 30–40 cm in 70 days. Transfer of pR68.45 was shown to occur from P. aeruginosa into the indigenous bacterial population although relatively low numbers of transconjugants were observed (log 2 cfu g−1 dry soil). The number of transconjugants also decreased with depth and time. Leaching of transconjugants, however, occured more readily than that of the GEM, probably as a result of plasmid transfer into smaller, more mobile bacteria. At 70 days incubation, no GEMs were detected in the columns, while transconjugants were observed at several depths. These results demonstrate the importance of examining both the survival and movement of GEMs and transconjugants in soil.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1574-6941.1993.tb00056.x
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  • 2
    Digitale Medien
    Digitale Medien
    Quantitative Approach to the Sequential Degradation of Proteins and Peptides (1969)
    [s.l.] : Nature Publishing Group
    Nature 221 (1969), S. 1241-1244 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Fig. 1. Mass spectra of phenylalanine methyl thiohydantoin at (A) 70 eV, (B) 10 eV. Fig. 2. mass spectra of a mixture of amino-acid methyl thiohydantoin derivatives at (I) probe temperature 90?, (II) 140?, (III) 160?, (IV) 200?. Ionizing voltage 10 e V. A, Glycine; B, alanine; C, valine; D, ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/2211241a0
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    CHOICES IN DEVELOPING ENERGY POLICIES: DISCUSSION PAPER (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 324 (1979), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1979.tb35141.x
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  • 4
    Digitale Medien
    Digitale Medien
    Energy strategy (1974)
    [s.l.] : Nature Publishing Group
    Nature 247 (1974), S. 332-332 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SIR,-I am sorry that travel has kept me from responding earlier to your provocative leader 'A Broader Debate on Energy' (Nature, 246, 179; 1973). In kindly discussing my monograph, 'World Energy Strategies: Facts, Issues, and Options', you attempt what I did not dare-a brief summary of an ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/247332a0
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Nuclear weapons and power-reactor plutonium (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 817-823 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] With modest design sophistication, high-burn-up plutonium from power reactors can produce powerful and predictable nuclear explosions. There is no way to ‘denature’ plutonium. Power reactors are not implausible but rather attractive as military production reactors. Current promotion of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/283817a0
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  • 6
    Digitale Medien
    Digitale Medien
    Plutonium and other actinides (1977)
    [s.l.] : Nature Publishing Group
    Nature 265 (1977), S. 390-390 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] THESE 41 technical papers form an indispensable basis for assessing the "growing concern about man's ignorance of the bio geochemistry of [plutonium and other actinides] ... in relation to ... long-term buildup, availability, and transport in the environment" (Noshkin). Nowhere is this concern more ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/265390b0
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  • 7
    Digitale Medien
    Digitale Medien
    Nitrogen fixation (1975)
    [s.l.] : Nature Publishing Group
    Nature 255 (1975), S. 8-8 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SIR,-Current 'biochemical and geneJtic attempts to develoip nitrogen-fixing bacteria symbiotic with plants now lacking them (some described by John Postgate, Nature, January 31, p. 305) raise a significant question. Sir Peter Medawar has said that when developing a new technology, one should try ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/255008c0
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Soft energy paths (1978)
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 107-108 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SIR,-Peter Chapman is right to say (10 November, page 128) that my US calculations in Soft Energy Paths: Toward a Durable Peace should be redone for the UK-as several colleagues are now attempting. But in suggesting how my US numbers "fail on a number of technical issues" he may mislead UK readers ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/271107b0
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