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  • 1990-1994  (4)
  • 1994  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Milbemycin production byStreptomyces sp.: the effect of carbohydrates (1994)
    Springer
    Journal of industrial microbiology and biotechnology 13 (1994), S. 43-48 
    Details
    ISSN: 1476-5535
    Keywords: Milbemycin ; Fructose ; Starch ; Carbon:nitrogen ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Milbemycin production byStreptomyces hygroscopicus RB4569D was examined in media containing different carbohydrates. Total milbemycin titer could be increased by substitution of fructose for glucose and by selection of the appropriate starch type. Total titer could be further enhanced by increasing the concentration of fructose and/or starch in the medium. Rates of carbohydrate utilization were shown to be independent of their initial concentration and increased titers in high carbohydrate media were shown to be due to a prolonged production phase rather than an increased accretion rate. The pattern of individual milbemycin components was governed by the carbon:nitrogen ratio of the medium rather than carbohydrate concentration and there was a critical C:N ratio below which no milbemycin was produced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01569661
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Raman spectra of human keratotic biopolymers: Skin, callus, hair and nail (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 95-98 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Fourier transform Raman spectra of human keratotic biopolymers were obtained. The spectra from skin stratum corneum, callus, nail and hair were fluorescence free and the samples did not degrade during analysis. Assignments consistent with the vibrational wavenumbers were made to characterize the molecular and conformational nature of the samples. The principal structural dissimilarities were in the sulphur content of tissues containing hard keratin (hair and nail) and soft keratin (stratum corneum and callus).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250250113
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    An approach to stone and fresco lichen biodeterioration through Fourier transform Raman microscopic investigation of thallus - substratum encrustations (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 99-103 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Fourier transform Raman spectra of thallus-substratum interfaces of Xanthoria parietina growing in situ on sandstone and gypsum were obtained for the first time. The presence of small amounts of calcium oxalate in thallus-substratum interfaces was confirmed spectroscopically and evidence for biodeterioration via lichen metabolic by-products was also noted. Although the oxalate determined spectroscopically was in good agreement with the results from thermogravimetric measurements there was also spectroscopic evidence for incorporation of stone particles into the lichen encrustation. Comparisons are made with Raman spectroscopic studies of the thalli of the high oxalate-producing lichen Dirina massiliensis forma sorediata. The Raman spectra Ochrolechia parella growing in association with Xanthoria parietina on maritime sandstone were also recorded and the spatial discrimination of the techniques for these high and low oxalate-producing lichens was demonstrated.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250250114
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Fourier transform Raman spectroscopy of bacterial cell walls (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 673-677 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Fourier transform Raman spectra were obtained from viable colonies of bacteria. Despite the highly coloured nature of the samples, the spectra were of sufficient quality to allow comprehensive assignments consistent with the vibrational modes. The spectra showed no clear evidence for the presence of phospholipids, indicating that penetration of the exciting infrared radiation was limited to the outermost components of the bacterial cell walls. The data describing the molecular and conformational state of the bacterial cell wall may aid in probing the modes of action of a wide range of antimicrobial agent.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250250730
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    Paper (German National Licenses)
    Fulltext
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