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  • Electronic Resource  (4)
  • 1995-1999  (4)
  • 1970-1974
  • 1935-1939
  • Polymer and Materials Science  (2)
  • Cell & Developmental Biology  (1)
  • Co-existence  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Immunohistochemical evidence for the presence, localization and partial coexistence of insulin, insulin-like growth factor I and relaxin in the protochordate Ciona intestinalis (1999)
    Springer
    Cell & tissue research 295 (1999), S. 331-338 
    Details
    ISSN: 1432-0878
    Keywords: Key words Insulin ; Insulin-like growth factor I ; Relaxin ; Co-existence ; Ovary ; Digestive tract ; Protochordate ; Ciona intestinalis (Tunicata)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The occurrence and coexistence of peptides of the insulin-like growth factor (IGF)/insulin superfamily were investigated in the ovary and gastro-intestinal tract of the protochordate Ciona intestinalis. Antisera specific for mammalian IGF-I, insulin and relaxin were used in a double-immunofluorescence method on paraffin sections and with an immunogold technique on consecutive semi-thin sections. IGF-I and relaxin immunoreactions but no insulin immunoreactions occurred in the ovary and were confined to medium-sized and mature follicle cells. Two subpopulations of reacting follicular cells were present: those containing only IGF-I immunoreactivity (5%) and those containing IGF-I and relaxin immunoreactivities (95%). In the gastro-intestinal tract, IGF-I and insulin immunoreactions coexisted, whereas no relaxin immunoreactions were obtained. Gel chromatography and radioimmunoassay in Ciona ovary revealed IGF-I immunoreactivity in two peaks with apparent molecular masses of approximately 16 kDa and 3 kDa. The present results indicate that (1) the same IGF-I-related peptide probably occurs in gastro-intestinal tract and ovary, (2) three different members of the insulin/IGF family of peptides are probably present in protochordates, (3) different types of coexistence of these peptides seem to exist in protochordates, i.e. an IGF-I-related peptide and an insulin-related peptide in the digestive tract and, as shown previously, in central nervous system, and the IGF-I-related peptide and relaxin in the ovary, (4) an IGF-I-related peptide and relaxin may be involved in oocyte maturation in the protochordate ovary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410051239
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  • 2
    Electronic Resource
    Electronic Resource
    Transfer constants from complete molecular weight distributions (1997)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 198 (1997), S. 663-663 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1997.021980237
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  • 3
    Electronic Resource
    Electronic Resource
    Transfer constants from complete molecular weight distributions (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 197 (1996), S. 403-412 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Transfer constants to chain-transfer agent (CTA) and to monomer can be obtained by consideration of the complete molecular weight distribution, using the slope of a plot of the natural logarithm of number-molecular weight distribution against molecular weight, in the limit of high molecular weight and low radical flux (P. A. Clay, R. G. Gilbert, Macromolecules 28, 552 (1995)). This method is applied to the bulk polymerisations of methyl methacrylate (MMA) with added triethylamine (TEA) and with added tert-dodecylmercaptan (mixture of 2,4,4,6,6-pentamethylheptane-2-thiol and 2,2,4,6,6-pentamethylheptane-4-thiol, TDM). The transfer rate coefficients are found to be 74 (±20) dm3 · mol- · s-l at 60°C for TEA, and 56 (±13) dm3 · mol-1 · s-1 at 25°C for TDM.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1996.021970131
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  • 4
    Electronic Resource
    Electronic Resource
    The vagaries of variegating transgenes (1996)
    New York, NY : Wiley-Blackwell
    BioEssays 18 (1996), S. 919-923 
    Details
    ISSN: 0265-9247
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Expression of transgenes in mice, when examined with assays that can distinguish individual cells, is often found to be heterocellular, or variegated. Line-to-line variations in expression of a transgene may be due largely to differences in the proportion of cells in which it is expressed. Variegated silencing by centromeric heterochromatin is well described, but other factors may also affect transgene silencing in mice. Tandem arrays of transgenes themselves form heterochromatin, and some cell lineages may tend to silence transgenes because of extensive facultative heterochromatin in their nuclei. The cis-acting transcriptional control elements within a transgene inhibit silencing, and strainspecific differences in chromatin proteins may strongly influence the extent of variegation. The accessibility of multiple differentiated cell lineages in mice suggests that they may provide a tool for dissecting the role of chromatin-mediated silencing in cell differentiation and tissue-specific gene expression.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bies.950181111
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