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  • 1990-1994  (2)
  • 1990  (2)
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  • 1990-1994  (2)
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  • 1990  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    The starvation-survival state of microorganisms in nature and its relationship to the bioavailable energy (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 813-817 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Starvation-survival ; energy ; ultramicrocells
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Although one can measure the organic matter in various ecosystems in terms of organic carbon, this measurement does not indicate what portion of the organic carbon is bioavailable to the microorganisms. Most organic matter is recalcitrant and, therefore, most microorganisms do not have sufficient energy to carry on their metabolism for growth and reproduction. As a result, many species of bacteria will form ultramicrocells and enter a physiological state known as starvation-survival. This physiological state results in metabolic arrest which permits the organisms to survive for long periods of time without sufficient energy for growth and reproduction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01935530
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Long-term starvation-induced loss of antibiotic resistance in bacteria (1990)
    Springer
    Microbial ecology 19 (1990), S. 251-257 
    Details
    ISSN: 1432-184X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Escherichia coli, Pseudomonas fluorescens, and aPseudomonas sp. strain 133B containing the pSa plasmid were starved in well water for up to 523 days. There were two patterns of apparent antibiotic resistance loss observed. InPseudomonas sp. strain 133B, there was no apparent loss of antibiotic resistance even after starvation for 340 days. InE. coli, by day 49 there was a ten-fold difference between the number of cells that would grow on antibiotic- and nonantibiotic-containing plates. However, over 76% of the cells that apparently lost their antibiotic resistance were able to express antibiotic resistance after first being resuscitated on non-selective media. By day 523, only 12% of these cells were able to express their antibiotic resistance after being resuscitated. After starvation for 49 days, cells that could not grow on antibiotic medium even after resuscitation, showed a permanent loss of chloramphenicol (Cm) resistance but retained resistance to kanamycin (Km) and streptomycin (Sm). Restriction enzyme digests show that a 2.5 to 3.0 Kb region from map location 12.5 to 15.5 Kb was deleted. This coincides with the 2.5 Kb reduction in plasmid size observed in 3 isolates that had lost antibiotic resistance after starvation for 49 days.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02017169
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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