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  • Analytical Chemistry and Spectroscopy  (1)
  • Genetics  (1)
  • 1
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thirty seven of the thirty eight isomers of tetrachlorodibenzofuran (TCDF) have been synthesized by unambiguous routes, and purified. The 1,2,8,9-TCDF isomer could not be thus prepared, and attempts to make it by pyrolysis of appropriate precursors also failed. Retention characteristics of TCDFs under gas chromatographic conditions were determined, and found to agree well with those predicted by an existing mathematical model derived from data obtained for TCDF isomers prepared by more ambiguous procedures. Mass spectral characteristics were also obtained, particularly relative response factors for the molecular ions of the TCDF isomers under electron ionization (EI) conditions. A discussion of the likely transferability of these relative response factors between mass spectrometers of different types is included. Chemical ionization (CI) mass spectra were also obtained, for both positive and negative ions. These CI spectra yielded little structural information not available from the EI data, and problems of lack of sensitivity and of reproducibility render them less suitable for trace analysis of TCDFs. Some unusual ion chemistry was observed under CI conditions, which can be rationalized in terms of pre-ionization attack on the TCDF molecule by free radicals in the source.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Developmental Genetics 9 (1988), S. 673-681 
    ISSN: 0192-253X
    Keywords: cytokinesis ; phagocytosis ; adhesion ; cytoskeleton ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Cellular slime mold amoebae have become a model system for the study of cell motility and the cytoskeleton. A basic problem which all cells face that involves the cytoskeleton is how to control their size. The varied ways in which cellular slime mold amoebae change their cell size-by changing the size at which division occurs, by cell fusion, and by control over cytokinesis-are reviewed. A model is presented which attempts to explain how the mechanisms affected in certain cytokinesis mutants in Dictyostelium discideum known as phg mutants could be involved in control of cell size in the predatory slime mold Dictyostelium caveatum.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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