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  • Chemistry  (4)
  • Cecum  (1)
  • 1985-1989  (5)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 250 (1987), S. 475-477 
    ISSN: 1432-0878
    Schlagwort(e): Intercellular junctions ; Brush border ; Cecum ; Freeze-fracture ; Prokaryotic cells ; Guinea pig
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Scanning electron microscopy demonstrated that the cecum of the guinea-pig is colonized by numerous spiral-shaped bacteria; these microorganisms, which adhere to mucosa at one end, were found exclusively on the brush border of the surface epithelium. The membranes of sectioned bacteria have a set of electron-dense bands girdling the tip adhered to epithelium. Freeze-fracture replicas of the bacteria revealed the prokaryote-eukaryote junction as a set of ridges on the P-face of outer membrane; the numerous particles of E-face were arranged in parallel rows; on the other hand, the apical plasma membrane and subjacent cytoplasm of epithelium occupied by the spiral-shaped bacteria did not show a structural counterpart. Observations suggest that one end of the spiral-shaped bacteria possesses specialized membrane components that permit specific attachment to the apical surface of epithelial cells.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Die Resultate von Untersuchungen über die chemische Wechselwirkung zwischen einigen monofunktionellen Modellverbindungen, die die Struktur und Reaktivität von wärmehärtbaren Phenol- und Harnstoff-Formaldehyd-Harzen simulieren, mit Holzkomponenten (Hemicellulosen, Cellulose und Lignin) werden dargelegt. Während Hemicellulosen deutlich dazu neigen, Kondensationsprodukte mit diesen Modellverbindungen zu ergeben, reagieren Lignine in manchen Fällen weniger leicht und abhängig davon, durch welchen Prozeß sie gewonnen worden sind, und abhängig von der Art der Modellverbindung. Cellulose reagierte wegen ihrer Kristallinität nicht unter den gegebenen Bedingungen.
    Notizen: Results are presented on the chemical interactions occurring when some monofunctional model compounds simulating the structure and reactivity of thermosetting phenol- and urea-formaldehyde resins are mixed with wood components (hemicelluloses, cellulose, and lignins). Whereas hemicelluloses clearly show a propensity to give condensation products with these model compounds, lignins can react less readily in some instances depending on the delignification procedure used to isolate them and on the type of model compound. Cellulose did not react under the conditions chosen, mostly because of its crystalline character.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: A low-molecular-weight disulfide derivative of the antileukemic agent 6-purinethiol (2) was used for coupling with a macromolecular carrier, poly(1-vinyl-2-pyrrolidone-co-maleic acid) via spacer groups. The in vitro hydrolytic stabilities of the polymeric prodrugs were examined at pH 7,2 and 8,8. An enhanced cleavage of the disulfide bridge yielding 6-purinethiol was observed. Enzymatic hydrolysis of the prodrug containing an enzyme-sensitive spacer was also done in the presence of elastase.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 33 (1989), S. 377-385 
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The design of a sliding controller for a continuous fermentation process is presented. The results obtained by simulation have proved the control scheme to be very robust. Regulation of substrate concentration at its optimal value has been achieved even though process parameters change their nominal values. Chattering effects are decreased by introducing a minor modification of the control variable around the sliding surface.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 239-249 
    ISSN: 0887-6266
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Previous investigations have given evidence of the existence of specific chemical interactions between poly(bisphenol-A carbonate) (PC) and a number of linear aliphatic polyesters, with the consequent formation of compatible polymer alloys. Here we address the particular kind of specific interaction that takes place in these systems by performing a quantum-mechanical study of the apparently most reasonable types of molecular interactions occurring in model compounds of the above polymers. Complete neglect of diffential overlap, (CNDO), in its CNDMEX version, and perturbative configuration using localized orbitals (PCILO) were the calculation schemes used on diphenyl carbonate (DPC) and dimethyl succinate (DMS), selected as models. It was found that, on a one-to-one basis, the DPC-DMS system is energetically more stable than the individual separate molecules; on examination of the possible interaction sites for the two chemical species, the interaction between the ester group oxygen in one DMS molecule with one of the phenyl rings in DPC appears to be the most favorable type of molecular interrelation, even though hydrogen bond formation is also possible between the oxygen atoms in DPC and the methylene hydrogens in DMS. (The former interaction decreases the total energy of the system by 0.12 kcal/mol, more than the latter.)
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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