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  • 1
    Electronic Resource
    Electronic Resource
    Regulation of methanol metabolism in the yeast Hansenula polymorpha (1987)
    Springer
    Archives of microbiology 147 (1987), S. 375-382 
    Details
    ISSN: 1432-072X
    Keywords: Hansenula polymorpha ; Regulation ; Methanol ; Methylotrophy ; Dihydroxyacetone ; Glycerol ; Xylose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study of enzyme profiles in Hansenula polymorpha grown on various carbon substrates revealed that the synthesis of the methanol dissimilatory and assimilatory enzymes is regulated in the same way, namely by catabolite repression and induction by methanol. Mutants of H. polymorpha blocked in dihydroxyacetone (DHA) synthase (strain 70 M) or DHA kinase (strain 17 B) were unable to grow on methanol which confirmed the important role attributed to these enzymes in the biosynthetic xylulose monophosphate (XuMP) cycle. Both mutant strains were still able to metabolize methanol. In the DNA kinase-negative strain 17 B this resulted in accumulation of DHA. Although DHA kinase is thought to be involved in DHA and glycerol metabolism in methylotrophic yeasts, strain 17 B was still able to grow on glycerol at a rate similar to that of the wild type. DHA on the other hand only supported slow growth of this mutant when relatively high concentrations of this compound were provided in the medium. This slow but definite growth of strain 17 B on DHA was not based on the reversible DHA synthase reaction but on conversion of DHA into glycerol, a reaction catalyzed by DNA reductase. The subsequent metabolism of glycerol in strain 17 B and in wild type H. polymorpha, however, remains to be elucidated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406136
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  • 2
    Electronic Resource
    Electronic Resource
    Photoreactions of water and carbon at 90 K (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 9477-9483 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ultraviolet (UV) irradiation (λ〈400 nm) of H2O co-adsorbed with alkali metal atoms (AM=K, Cs) on the graphite (0001) surface at 90 K leads to the formation of a range of desorbing products (H2, CH4, CO, and CO2); and to the formation of oxygen-rich AM–O–C complexes on the surface. The reaction proceeds via hydrated AM complexes [AM–(H2O)n], which represent the main photo-reactive center in the co-adsorption systems. The proposed mechanism is initiated by the formation of hot electron–hole pairs in the substrate under UV irradiation. Attachment of a hot electron to an AM–(H2O)n complex can lead to selective dissociation of the associated water molecules. The resultant release of reactive species (e.g., excited H; OH) initiates a range of branched/chain reactions yielding the observed desorbing species. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1414375
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  • 3
    Electronic Resource
    Electronic Resource
    Negative ion formation in the scattering of CF3+ from graphite (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 1096-1098 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The scattering of CF3+ from highly oriented pyrolytic graphite results in the formation of CF3−. Comparison is made with CF3+ scattering from a metal and from an insulator surface, which do not yield negative molecular ions. The outcome of the charge transfer processes that occur as CF3+ approaches a surface is critically dependent on the electronic properties of that surface. The ability to produce a stable negative ion close to a surface may be an important factor in the etching efficiency of the CF3 molecule. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289808
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  • 4
    Electronic Resource
    Electronic Resource
    Inelastic scattering of molecules from a liquid polymer surface (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 11080-11087 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The (dissociative) scattering of CF+ and CF2+ ions from a perfluoropolyether is analyzed on the basis of the conservation laws of energy and momentum. The ion–surface collisions are treated as binary collisions between the primary ions and a representative group of the perfluoropolyether molecule. The energy partition between the two particles is analyzed on the basis of a statistical distribution between harmonic oscillators. The energy transfer between the individual atoms is treated as inelastic rovibrational excitation. This method not only allows us to draw some general conclusions concerning the dynamics of this type of molecule–surface collision, but also to estimate the dissociation probability of the scattered molecules as a function of the scattering angle and the energy loss. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480466
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  • 5
    Electronic Resource
    Electronic Resource
    The methylotrophic yeasts (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 4 (1988), S. 1-15 
    Details
    ISSN: 0749-503X
    Keywords: Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320040102
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