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  • Candida maltosa  (2)
  • Organic Chemistry  (2)
  • 68-04  (1)
  • 79.20.N
  • LUNAR AND PLANETARY EXPLORATION
  • 1985-1989  (4)
  • 1870-1879  (1)
Collection
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Computing 35 (1985), S. 231-246 
    ISSN: 1436-5057
    Keywords: 51N20 ; 68-04 ; 68C05 ; 68C25 ; Visible surface algorithms ; computational geometry ; computer graphics ; computational complexity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Das Visible-Surface-Problem besteht darin, die Teilpolygone einer 3-D-Szene aus beliebigen einfachen planaren Polygonen zu bestimmen, die von einem gegebenen Augenpunkt aus sichtbar sind. Der Algorithmus der hier vorgestellt wird, und der für umfangreiche Szenen ausgelegt ist, löst dieses Problem durch implizites Zerlegen bezüglich eines Zellrasters. Die Komplexitätsabschätzung führt zu Aussagen über die günstige Wahl des Gitters und zu der Charakterisierung von Szenenklassen, welche bei praktischen Anwendungen auftreten, und für die der Algorithmus ein lineares Zeit- und Speicherplatzverhalten zeigt.
    Notes: Abstract The visible surface problem is to determine those subpolygons of a 3-D scence of arbitrary simple planar polygons which are visible from a given viewpoint. The algorithm which is presented here, and which is designed for complex scenes solves this problem by an implicit partitioning w.r.t. a raster of cells. The estimation of complexity leads to propositions on the favorable choice of the grid, and to the characterization of classes of scenes, which are relevant for practical applications, and for which the algorithm shows a linear time and space behavior.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 147 (1987), S. 240-244 
    ISSN: 1432-072X
    Keywords: Cytochrome P-450 ; Alkane hydroxylation ; Candida maltosa ; Carbon monoxide inhibition ; Oxygen limitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A method for selective and reversible inhibition of the alkane hydroxylating cytochrome P-450 in growing yeast cells was developed. Using low concentrations of carbon monoxide in a specially adapted small-scale fermentor system a complete inhibition of the first step of alkane degradation was obtained, obviously without influencing further metabolic steps. Thus, fatty alcohols which were shown to be the immediate products of the cytochrome P-450 catalyzed reaction were utilized with unchanged rates by yeast cultures blocked with carbon monoxide in alkane degradation. Moreover, significant differences were found in the pO2-dependencies of utilization of n-alkanes, fatty alcohols and further intermediates. It was concluded, that the alkane hydroxylating cytochrome P-450 system is distinguished by the lowest oxygen affinity among the oxygen-activating enzyme systems involved in alkane assimilation.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 147 (1987), S. 245-248 
    ISSN: 1432-072X
    Keywords: Candida maltosa ; Cytochrome P-450 ; Alkane hydroxylation ; Oxygen-limitation ; Carbon monoxide-inhibition ; Enzyme regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Transition of n-hexadecane utilizing cultures of Candida maltosa to oxygen-limited growth caused an up to 6-fold increase of the cellular cytochrome P-450 content. Enhanced cytochrome P-450 formation required protein de novo synthesis and was not due to a change of the apo/holo-enzyme ratio as demonstrated by cycloheximide inhibition and immunological quantitation. The effect of low oxygen concentration (pO2=3–5%) was simulated by selective inhibition of alkane hydroxylation with carbon monoxide (at a pO2 of 70–75%). Enhanced cytochrome P-450 formation occurred even when a constant growth rate was maintained through utilization of a second non-repressive growth substrate. However, the presence of n-alkanes was an essential precondition. It was concluded, that the cytochrome P-450 formation was mainly regulated by the intracellular inducer concentration which depends on the relative rates of alkane transport into the cell and the actual alkane hydroxylating activity of the enzyme system.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 173 (1874), S. 303-317 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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