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Digitale Medien

Treatment with allyl alcohol selects specifically for mutants of Clostridium acetobutylicum defective in butanol synthesis (1986)

Dürre, P. ; Kuhn, A. ; Gottschalk, G.

Oxford, UK : Blackwell Publishing Ltd

FEMS microbiology letters 36 (1986), S. 0

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ISSN: 1574-6968

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: Abstract Treatment of Clostridium acetobutylicum with allyl alcohol allowed the selection of mutants which were unable to produce n-butanol, whereas the synthesis of acetone and ethanol was unaffected. Enzymatic investigations revealed that all mutant strains were devoid of butyraldehyde dehydrogenase or showed a very low activity of this enzyme as compared to the wild type.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1574-6968.1986.tb01670.x

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Digitale Medien

Genetic variation of an acid phosphatase (Acp-2) in the laboratory rat: Possible homology with mouse AP-1 and human ACP2 (1986)

Bender, K. ; Bissbort, S. ; Kuhn, A. ; [weitere]

Springer

Biochemical genetics 24 (1986), S. 1-11

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ISSN: 1573-4927

Schlagwort(e): Rattus norvegicus ; acid phosphatases ; genetic variation ; linkage studies

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Chemie und Pharmazie

Notizen: Abstract A genetic locus controlling the electrophoretic mobility of an acid phosphatase in the rat (Rattus norvegicus) is described. The locus, designed Acp-2, is not expressed in erythrocytes but is expressed in all other tissues studied. The product of Acp-2 hydrolyzes a wide variety of phosphate monoesters and is inhibited by l(+)-tartaric acid. Inbred rat strains have fixed either allele Acp-2a or allele Acp-2b. Codominant expression is observed in the respective F1 hybrids. Backcross progenies revealed the expected 1:1 segregation ratio. Possible loose linkage was found between the Acp-2 and the Pep-3 gene loci at a recombination frequency of 0.36±0.06.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00502974

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Digitale Medien

Electrical resistivity of the Ti $\mathsf{_4}$ O $\mathsf{_7}$ Magneli phase under high pressure (2003)

Acha, C. ; Monteverde, M. ; Núñez-Regueiro, M. ; [weitere]

Springer

The European physical journal 34 (2003), S. 421-428

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ISSN: 1434-6036

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract. We have measured resistivity as a function of temperature and pressure of Ti4O7 twinned crystals using different contact configurations. Pressures over 4 kbar depress the localization of bipolarons and allow the study of the electrical conduction of the bipolaronic phase down to low temperatures. For pressures P 〉 40 kbar the bipolaron formation transition is suppressed and a nearly pressure independent behavior is obtained for the resistivity. We observed an anisotropic conduction. When current is injected parallel to the principal axis, a metallic conduction with interacting carrier effects is predominant. A superconducting state was not obtained down to 1.2 K, although evidences of the proximity of a quantum critical point were noticed. While when current is injected non-parallel to the crystal’s principal axis, we obtained a logarithmic divergence of the resistivity at low temperatures. For this case, our results for the high pressure regime can be interpreted in the framework of interacting carriers (polarons or bipolarons) scattered by Two Level Systems.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1140/epjb/e2003-00240-2

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