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  • 4-hydroxy-1,2-dithiolane  (1)
  • Chemistry  (1)
  • Electron and hole centers  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Phytochemistry 15 (1976), S. 220-221 
    ISSN: 0031-9422
    Keywords: 4-hydroxy-1,2-dithiolane ; Bruguiera cylindrica ; Rhizophoraceae ; phenylaminocarbonyl ester.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0827
    Keywords: ESR ; Tricalcium phosphates ; Electron and hole centers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary After X-ray irradiation, new paramagnetic centers were observed in electron spin resonance (ESR) spectra of amorphous calcium phosphate (ACP) and Mg-containing tricalcium phosphate (Mg-TCP) when they were heated at 900°C for 1 h before irradiation. Heated ACP shows a single resonance signal atg=2.0005 in place of the hyperfine doublet of the PO 4 2− ion radical, which is the dominant species in the ESR spectrum of unheated ACP. A similar signal is observed in the heated Mg-TCP. Treatment with electron scavengers (Pb2+ and Cd2+) and hole scavengers (Ce3+) suggests that the single resonance signal can be ascribed to a trapped electron. Comparison between the ESR spectra before and after annealing indicates that in the case of the heated ACP such a signal is most likely connected with a localized unpaired electron close to the calcium; on the other hand, in the case of the heated Mg-TCP the signal is connected with the localized electron close to the magnesium. In addition, new sets of signals are observed in those heated samples. Their hyperfine splittings are 612 and 713 gauss for the heated ACP, and 589 and 683 gauss for the heated Mg-TCP. Those new sets of signals are found to be ascribed to the trapped holes close to two magnetically distinct sites of phosphorus nuclei in the crystal lattice ofβ-tricalcium phosphate. Treatment with deuterium oxide strongly indicates that hydrogen atoms originate from adsorbed water molecules, although their half-life is a matter of months even at room temperature.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 9 (1967), S. 45-54 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The production of L-glutamic acid from hydrocarbons by a newly isolated bacterium, which was identified as Corynebacterium, was investigated. The outstanding characteristic of this bacterium was found to be an accessory requirement of thiamine for growth. The optimum concentration of thiamine for growth was 50 μg./liter, while that for L-glutamic acid production was 3-5 μg./liter. n-Paraffins ranging from dodecane to heptadecane were best for L-glutamic acid production, and about 5 g. of L-glutamic acid were obtained from 30 g. of these individual n-paraffins. On the other hand, a tracer experiment using oxygen-18 revealed that molecular oxygen was incorporated into L-glutamic acid produced from dodecane. Based on the incorporation value of molecular oxygen in L-glutamic acid, a hypothetical pathway for the biosynthesis of L-glutamic acid from dodecane was discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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