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  • Escherichia coli  (2)
  • Libya  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 22 (1983), S. 1-5 
    ISSN: 1436-6215
    Keywords: zinc ; hair ; malnutrition ; Libya
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Der Haarzinkgehalt wurde in Haaren von Kindern aus Nord- und Südlibyen bestimmt. Der Zinkgehalt betrug 213±36 μg/g bei libyschen Neugeborenen. Es bestand kein Unterschied zwischen den Werten von Neugeborenen aus Nord- und Südlibyen. Der Zinkgehalt fällt während der Säuglingszeit ab. Bei Klein- und Schulkindern lag der Zinkgehalt bei 88±35 μg/g bzw. 89±25 μg/g. Diese Werte sind so niedrig wie die bei amerikanischen kleinwüchsigen Kindern oder fast so niedrig wie bei den ägyptischen und persischen Zwergen mit vermindertem Zincstatus.
    Notes: Summary Hair zinc has been investigated in children of North and South Libya. The hair zinc content amounts to 213±36 μg/g in newborns. There is no difference between the values of newborns from North Libya and newborns from South Libya. The hair zinc values decrease during infancy. In toddlers and school-children the hair zinc content is 88±35 μg/g, 89±25 μg/g resp. These values are as low as those reported in American children with low height percentiles or nearly as low as those found in dwarfs with poor zinc status from Egypt and Iran.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 211 (1988), S. 138-142 
    ISSN: 1617-4623
    Keywords: Escherichia coli ; DnaA ; Replication initiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Overexpression of DnaA protein from a multicopy plasmid accompanied by a shift to 42°C causes initiation of one extra round of replication in a dnaA + strain grown in glycerol minimal medium. This extra round of replication does not lead to an extra cell division, such that cells contain twice the normal number of chromosomes.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 213 (1988), S. 379-387 
    ISSN: 1617-4623
    Keywords: Stringent control ; RNA polymerase ; Escherichia coli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Previous studies on two Escherichia coli rpoB mutants, carrying single amino acid substitutions at approximate amino acid positions 736 and 906 in the β subunit, showed that these alterations in the RNA polymerase resulted in an apparent reduced response to valine-induced amino acid starvation in vivo and prevented ppGpp-mediated inhibition of transcriptional initiation at stable RNA promoters in vitro. These observations suggested that the mutations had altered either the ppGpp binding site or the promoter selectivity of the enzyme. The in vivo analysis presented here indicates that these mutants encode an RNA polymerase that responds normally to changes in the level of ppGpp; their apparent relaxedness is due to a reduced accumulation of ppGpp during isoleucine starvation. Thus, there is no indication that the mutations have altered ppGpp binding sites. These observations and the difference between in vitro and in vivo results can be explained by the assumption that the mutations produce an extended ppGpp-dependent pausing of RNA polymerase during the transcription of unstable RNA. Comparison of the vivo and in vitro effects of ppGpp on rrn transcription further suggests that these reflect different phenomena, although in both cases ppGpp inhibits rrn transcription.
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