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  • 1
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/General Subjects 716 (1982), S. 358-365 
    ISSN: 0304-4165
    Schlagwort(e): (A. cylindrica heterocysts) ; Nitrogen fixation ; Pyruvate: ferredoxin oxidoreductase
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie , Medizin , Physik
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    FEBS Letters 158 (1983), S. 79-83 
    ISSN: 0014-5793
    Schlagwort(e): Anabaena cylindrica ; Anaplerotic reaction ; Glycolysis ; Heterocyst ; Tricarboxylic acid cycle ; Vegetative cell
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Thermochimica Acta 133 (1988), S. 299-304 
    ISSN: 0040-6031
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Thermochimica Acta 85 (1985), S. 299-302 
    ISSN: 0040-6031
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Thermochimica Acta 218 (1993), S. 211-219 
    ISSN: 0040-6031
    Schlagwort(e): emittance measurement ; refractory materials
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Thermochimica Acta 218 (1993), S. 305-315 
    ISSN: 0040-6031
    Schlagwort(e): Spectral- and total emittance ; high temperature fiber reinforced materials ; multiwavelength pyrometry ; radiation temperature measurement
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 36 (1986), S. 0 
    ISSN: 1574-6968
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract Glyceraldehyde-3-P dehydrogenase (GAPDH) in heterocysts and vegetative cells of 3 N2-fixing cyanobacteria was found to utilize both NAD+ and NADP+. The enzyme activity was enhanced by thiols (glutathione, reduced lipoic acid and dithiothreitol). GAPDH of the 3 cyanobacterial species was not activated by thioredoxin. Heterocysts have now been shown to possess all the enzymes of glycolysis and the tricarboxylic acid cycle to convert glyceraldehyde-3-phosphate (GAP) to oxoglutarate and glutamate. The GAPDH reaction is a major source for the generation of NADH, which is oxidized by a thylakoid-bound NADH:plastoquinone oxidoreductase in heterocysts.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Archives of microbiology 141 (1985), S. 364-370 
    ISSN: 1432-072X
    Schlagwort(e): Nitrogen fixation ; Denitrification ; Associative symbiosis ; Acetylene reduction ; Nitrous oxide formation ; Azospirillum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A model system is described where Azospirillum and germinated wheat seeds were grown in association for a week and then assayed for nitrogen fixation (C2H2-reduction) and denitrification (N2O-formation) activities. The association performed C2H2-reduction and N2O-formation under microaerobic conditions. Both activities were measurable after already 3–5 h of incubation with substantial rates and were strictly dependent on the presence of both plants and bacteria. During the week of the growth of the association, the bacteria had lived exclusively from the carbon compounds supplied by the roots of the plants. C2H2-reduction activity by the association was more or less the same with all the Azospirillum brasilense strains, but lower with A. lipoferum and with the A. amazonense strains tested. Two nitrogenase negative mutants of Azospirillum brasilense showed virtually no activity in the association. C2H2-reduction activity was strongly dependent on the growth temperature of the association. Denitrification (N2O-formation) was high also at higher temperatures and at pH-values in the medium around 7.8 but not at neutrality and was strictly dependent on nitrate. The Azospirillum strain used strongly determined the rate of the N2O-formation in the association. It is suggested that Azospirillum may be beneficial to crops particularly under tropical conditions.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Heat and mass transfer 4 (1971), S. 133-141 
    ISSN: 1432-1181
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Beschreibung / Inhaltsverzeichnis: Abstract A description is given of an equipment for measuring the total normal emittance and the angular dependence of the emittance of solids in the temperature range from 1000 K to 3000 K. The emittance is determined by comparing the radiation emitted from the surface of the sample to the radiation emitted from a blackbody. The samples are small disks and are heated in vacuum by an electron gun. The temperature measurement is by a photoelectric special pyrometer in a hole drilled radially in the sample. The measured data are digitally recorded and evaluated by means of a computer program. So it is possible to make systematic measurements in a short time. The error is in the region of 3%. — Experimental results for graphite, molybdenum, tantalum and tungsten are presented.
    Notizen: Zusammenfassung Es wird eine Anlage beschrieben, mit der die Temperatur- und Winkelabhängigkeit des Gesamtemissionsgrades fester Stoffe bei Temperaturen zwischen 1000 K und 3000 K gemessen werden kann. Die Anlage arbeitet nach der Methode des Strahlungsvergleiches. Dabei wird der Strahlungsfluß von der Oberfläche einer scheibenförmigen Probe mit einem Gesamtstrahlungsempfänger gemessen, der an einem schwarzen Körper kalibriert wird. Die Probe wird im Vakuum mit einer Elektronenkanone beheizt und die Temperatur in einer radialen Bohrung pyrometrisch gemessen. Digitale Datenerfassung ermöglicht Serienmessungen mit verhältnismäßig geringem Zeitaufwand, da die Meßdaten maschinell ausgewertet werden. Der maximale Fehler liegt bei 3%. — Es wird über Messungen an Graphit, Molybdän, Tantal und Wolfram berichtet.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    International journal of thermophysics 16 (1995), S. 257-265 
    ISSN: 1572-9567
    Schlagwort(e): composites ; emissivity ; graphite ; high temperatures ; silicon carbide ; solicon nitride
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Carbon, carbides, and nitrides are materials having a relatively high emissivity over the entire spectral range. They are important both as a material and as material components of composites for high-temperature applications, e.g.. in space technology (reusable space transport systems) or energy systems (hot gas turbines). The normal total and spectral emissivities of these three materials have been investigated in the temperature range 1000 to 2000 K and at wavelengths between 0.6 and 6.8 μm. The results have been used to interpret emissivity results of fiber-matrix composites. They are also discussed with regard to potential application as reference materials for high-temperature emissivity measurements.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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