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  • 1
    Digitale Medien
    Digitale Medien
    Mutagenesis and epistatic grouping of the Neurospora meiotic mutants, mei-2 and mei-3, which are sensitive to mutagens
    Amsterdam : Elsevier
    Mutation Research/DNA Repair 315 (1994), S. 249-259 
    Details
    ISSN: 0921-8777
    Schlagwort(e): DNA repair ; Meiotic mutant ; Mutator ; Neurospora crassa ; Recombination repair
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-8777(94)90036-1
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  • 2
    Digitale Medien
    Digitale Medien
    Epistasis, photoreactivation and mutagen sensitivity of DNA repair mutants upr-1 and mus-26 in Neurospora crassa
    Amsterdam : Elsevier
    Mutation Research/DNA Repair 218 (1989), S. 95-103 
    Details
    ISSN: 0921-8777
    Schlagwort(e): DNA repair ; Neurospora crassa ; Photoreactivation ; Reversion ; UV sensitivity
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-8777(89)90015-3
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  • 3
    Digitale Medien
    Digitale Medien
    Characterization and expression of a Neurospora crassa ribosomal protein gene, crp-7 (2000)
    Springer
    Current genetics 37 (2000), S. 119-124 
    Details
    ISSN: 1432-0983
    Schlagwort(e): Key words Ribosomal protein gene crp-7 ; RFLP mapping ; Super induction ; Neurospora crassa
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract We have isolated and characterized a Neurospora crassa cytoplasmic ribosomal protein gene, named crp-7, which is found upstream of the photolyase gene. The deduced amino-acid sequence of this gene is highly homologous to the YS25 ribosomal protein of Saccharomyces cerevisiae. The crp-7 ORF consists of two exons which are separated by a short intron. The deduced polypeptide contains 87 amino acid residues and has a calculated molecular weight of 9.7 kDa. RFLP mapping showed that the crp-7 gene is located on the right arm of linkage group I. Southern blot hybridization analyses indicated that there is only one copy of the crp-7 gene in the N. crassa genome. Transcriptional elements, the Dde box, the Taq box and the CG element, that have been identified in other N. crassa ribosomal protein genes are observed in the promoter region of the crp-7 gene. The crp-7 mRNA levels were low in conidia and highest in young mycelia during vegetative growth. The mRNA levels of four r-protein genes, including the crp-7 gene, as well as the tef-1 gene encoding translational elongation factor 1α, were raised following the treatment of mycelia with a low concentration of cycloheximide. This indicates that the expression of r-protein genes is under the control of so-called super-induction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002940050018
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  • 4
    Digitale Medien
    Digitale Medien
    Pleiotropic deficiencies of the laccase-derepressed mutant lah-1 are caused by constitutively increased expression of the cross-pathway control gene cpc-1 in Neurospora crassa (1998)
    Springer
    Molecular genetics and genomics 258 (1998), S. 619-627 
    Details
    ISSN: 1617-4623
    Schlagwort(e): Key wordslah-1 ; cpc-1 ; Laccase ; Cycloheximide-inducible genes ; Neurospora crassa
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract In Neurospora crassa, expression of the laccase gene is induced by treatment with the protein synthesis inhibitor cycloheximide (CHX). This expression is mediated by CPC1, which acts as a general transcriptional activator when mycelia are treated with CHX or starved for any one of the amino acids. A laccase-derepressed mutant, lah-1, shows pleiotropic deficiencies in growth, hyphal morphology, CHX sensitivity, and production of protoperithecia. Moreover, in the lah-1 mutant, transcript levels of CHX-inducible genes, including lacc, tub-2, tef-1, and amino acid biosynthetic genes such as cpc-1, trp-3, and arg-12, are increased without exposure to CHX. All of the defects exhibited in the lah-1 mutant are suppressed by a mutation in the cpc-1 locus. These findings suggest that the cpc-1 mutation is epistatic to the lah-1 mutation and that the pleiotropic defects in the lah-1 mutant are attributable to constitutive expression of CPC1. These conclusions are supported by a developmental Northern blot analysis of the CHX-inducible genes. Based on these results, the lah-1 gene product appears to regulate expression of the cpc-1 gene negatively. Expression of the CHX-inducible genes was induced by CHX treatment in the lah-1 cpc-1 mutant, as well as in the cpc-1 mutant. This observation indicates that LAH1 is not a component of CHX-responsive pathway itself.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004380050775
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  • 5
    Digitale Medien
    Digitale Medien
    Effect of organic solvents on the activity of glucoamylase (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 1172-1177 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Hydrolyses of maltose, maltotriose, and soluble starch catalyzed by glucoamylase (Asp. Niger) were carried out in the aqueous solutions of methanol, ethanol, ethylene glycol, and 1,4-dioxane at 40°C and at the optimum pH in the respective solutions. By the kinetic analysis based on the subsite model, it was shown that the intrinsic rate constant, Kint, was electrostatically affected by the dielectric constant of the hydroorganic solutions. The affinity of the third subsite, A3, which affects the apparent rate constant, K0, was correlated with the ×Gtr's of maltose and amino acid side chains.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260280807
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  • 6
    Digitale Medien
    Digitale Medien
    Polymerization in submonolayers of styrene monomer adsorbed from its vapor phase (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 1519-1527 
    Details
    ISSN: 0887-6266
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The surface coverage of porous glass (PD = 500 Å) by styrene adsorbed from its vapor (0.1-6 torr) was studied in a vacuum electrobalance. The adsorption isotherm of the monomer was analyzed by the BET method, and a full monolayer coverage was found to form at a relative pressure of 0.11, weighing 6 mg per gram of glass. Polymerization in submonolayers of adsorbed styrene was initiated by thermal decomposition of predeposited BPO and found to continue until all initiator decomposed, sample cooled, or vapor removed, hence allowing a controlled film thickness. The films were extracted in THF and analyzed by computerized GPC. Molecular weights were in the range 18000-69000. These were related to the rates of polymerization by the usual statistical correlations.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/polb.1988.090260713
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  • 7
    Digitale Medien
    Digitale Medien
    Transport of a gas through asymmetric polysulfone membranes with deposited plasma-polymerized thin layer (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 41 (1990), S. 2427-2436 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A plasma-polymerized thin layer was deposited on the top surface of the skin layer of the asymmetric polysulfone (PSF) membrane to plug ultrafine pores passing through it. Trifluoromethane was used as the monomer gas of plasma polymerization. The steady-state permeation rates for oxygen and nitrogen through the asymmetric PSF membranes with the plasma modification were measured to evaluate the permselectivity and permeability. If ultrafine pores passing through the asymmetric membrane can be plugged by the plasma-polymerized thin layer, the separation factor of oxygen relative to nitrogen can be increased with the permeation rate coefficient of oxygen still kept large. This condition was met when the vaporization time of the cast solution during the preparation of an asymmetric membrane ranged from 10 to 120 s and the plasma polymerization time ranged from 15 to 30 min.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1990.070410942
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  • 8
    Digitale Medien
    Digitale Medien
    Viscosity of concentrated styrene solutions of polystyrene (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 12 (1968), S. 9-11 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Viscosities of concentrated solutions of polystyrene of different intrinsic viscosities were measured at varying polymer concentration and temperature. By modifying Martin's equation, an empirical equation correlating the viscosity of the solution as a function of the polymer concentration, the intrinsic viscosity of the polymer, and temperature was obtained.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1968.070120102
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  • 9
    Digitale Medien
    Digitale Medien
    Korrelation zwischen Mössbauer-Isomerieverschiebungen und ESCA-Bindungsenergien (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 483 (1981), S. 75-85 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Correlation between Mössbauer Isomer Shifts and ESCA Binding EnergiesThe correlation between core-electron binding energies and Mössbauer isomer shifts is investigated and discussed for low-spin pentacyanoferrates(II), high-spin iron(III) compounds and high-spin iron(II) halides. The Fe2p3/2 binding energies of the investigated pentacyano ferrates(II) increase with decreasing isomer shifts as a consequence of the increasing π acid strengths of the sixth ligands. In contrast, the electron binding energies in high spin iron(III) compounds and iron(II) halides increase with increasing isomer shifts. This correlation is caused by the σ donor properties and the electronegativity of the ligands.
    Notizen: Der Zusammenhang zwischen core-Elektronen-Bindungsenergien und Mössbauer-Isomerieverschiebungen wird für low-spin-Pentacyanoferrate(II), high-spin-Eisen(III)-Verbindungen und high-spin-Eisen(II)-halogenide untersucht und diskutiert. Die Fe2p3/2-Bindungsenergien der untersuchten Pentacyanoferrate(II) nehmen mit Kleiner werdenden Isomerieverschiebungen als Folge zunehmender π-Säurestärken der sechsten Liganden zu. Im Gegensatz dazu wachsen die Bindungsenergien der high-spin-Eisen(III)-Verbindungen und Eisen(II)-Halogenide mit zunehmender Isomerieverschiebung. Ursache sind die σ-Donoreigenschaften und die Elektronegativität der Liganden.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19814831210
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  • 10
    Digitale Medien
    Digitale Medien
    Mössbauer and X-ray photoelectron spectroscopic studies of prussian blue and its related compounds (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 430 (1977), S. 241-249 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Mössbauer- und Röntgen-Photoelektronenspektroskopische Untersuchungen an Berlinerblau und verwandten VerbindungenDie 57Fe-Mössbauer-Spektren der drei isomorphen Verbindungen des Typs Fe4[MB(CN)6]3 · xH2O (MB = Fe, Ru bzw. Os) wurden im Temperaturbereich von -178 bis 25°C gemessen. Die Spektren der Ruthenium- und Osmium-Verbindungen sind sehr ähnlich dem des angereicherten 57Fe4[Fe(CN)6]3 · xH2O. Die Temperaturabhängigkeit der Isomerieverschiebung und der Quadrupolaufspaltung wird interpretiert als Ausdruck der Gitterdynamik. Die Röntgen-Photoelektronenspektren unterstützen die Schlußfolgerungen aus den Mössbauer-Untersuchungen.
    Notizen: The 57Fe Mössbauer spectra of three isomorphous compounds of the type Fe4[MB(CN)6]3 · xH2O, where MB is Fe, Ru or Os, have been measured in the temperature range between -178 and 25°C. The spectral pattern of the ruthenium and osmium compounds is very similar to that of selectively enriched 57Fe4[Fe(CN)6]3 · xH2O. The temperature dependence of the isomer shift and quadrupole splitting is interpreted in terms of lattice dynamics. The X-ray photoelectron spectra also support the conclusions drawn from the Mössbauer study.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19774300123
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