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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 207 (1987), S. 114-119 
    ISSN: 1617-4623
    Keywords: RNA polymerase ; Promoters ; Bacillus subtilis ; Sigma ; Transcription termination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sequencing data indicated that the RNA polymerase (σ43) operon of Bacillus subtilis consisted of three genes, P23 (function unknown), dnaE (DNA primase), and rpoD (σ43) (Wang and Doi 1986a). S1 nuclease mapping experiments with RNA from various stages of growth demonstrated the presence of two overlapping σ43 promoters that controlled the expression of the operon during growth and a σ37 promoter that regulated the expression of the operon during the sporulation phase. This promoter switching mechanism ensured that this important operon would be expressed during different nutritional states of the cell and also illustrated a function for the minor RNA polymerase σ37 holoenzyme in the expression of genes which are normally expressed during the logarithmic phase of growth. The location of the transcription termination signal confirmed that the σ43 operon consists of three genes.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric surgery international 5 (1990), S. 110-113 
    ISSN: 1437-9813
    Keywords: Infantile hypertrophic pyloric stenosis ; Enkephalin ; Substance P ; Vasoactive intestinal polypeptide ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the recent literature it has been noted that peptidergic nerves may play an important role in infantile hypertrophic pyloric stenosis (HPS). Specimens from 20 patients with HPS were examined by immunohistochemistry with regard to the distribution of nerve cells and nerve fibers containing enkephalin (ENK), substance P (SP), and vasoactive intestinal polypeptide (VIP). Three subpopulations of peptides containing nerve cells and fibers were fairly numerous in the control specimens, but in the patients with HPS the density of the nerve fibers was markedly reduced and occasionally absent, especially the ENK- and VIP-containing fibers. In the myenteric plexus there was neither a reduction of nerve cell bodies nor of fibers. Our findings suggest that abnormalities of peptide-containing nerve fibers or impairment of neuronal function might results in HPS.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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