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  • 1
    ISSN: 1432-072X
    Keywords: Methanobacterium thermoautotrophicum ; Coenzyme F420 ; Deazaflavin ; 7,8-didemethyl-8-hydroxy-5-deazariboflavin ; Biosynthesis ; Fragment FO
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A fluorescent pigment was isolated from the culture fluid of Methanobacterium thermoautotrophicum strain ΔH. This pigment was shown to be 7,8-didemethyl-8-hydroxy-5-deazariboflavin by various spectroscopic and chromatographic techniques. This compound was previously described as the “FO” acid hydrolysis fragment of coenzyme F420. On the basis of the time of appearance of the pigment in the course of fermentation, it is suggested that this substance may be an over-produced biosynthetic precursor of F420.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of pest science 57 (1984), S. 41-45 
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Zusammenfassung Unter Verwendung eines standardisierten Sandsubstrats wurde der Einfluß von Sublimat auf die Entwicklung von drei Feldheuschreckenarten (Acrotylus patruelis [H.-S.],Aiolopus thalassinus [F.] undOedipoda coerulescens [L.]) geprüft. In Konzentrationen von mehr als 0.01 ‰ Hg im Substrat wurde die Embryonalentwicklung bei allen drei Arten gestört, so daß die Schlupfrate der Larven deutlich absank. Bei Arten mit Eidiapause wurde die Postembryonalentwicklung noch stärker beeinflußt. In diesen Fällen reichten bereits, 0,001 ‰ Hg im Trockensand aus, um die Population um 50% zu reduzieren. Als derzeitige Toleranzgrenze für Quecksilber im Boden ist maximal 0,1 mg/kg anzugeben.
    Notes: Abstract Using a standarized sandy substrate as soil the influence of HgCl2 has been proved on the development of three grasshopper species ((Acrotylus patruelis [H.-S.],Aiolopus thalassinus [F.] andOedipoda coerulescens [L.]). The embryonic development of all the three species was significantly reduced in concentrations of more than 0.01 ‰ Hg in the substrate. In species with egg diapause ten times lower amounts were sufficient to get a reduction of the postembryonic development, only 0.001 ‰ Hg in the soil were necessary to reduce the population to 50%. At present the tolerance limit of mercury in the soil has to pretend with 0.1 mg/kg at maximum.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Determination of safety characteristics for explosive gas mixtures. This paper presents equipment for determining safety characteristics such as explosion limits, flame temperatures, and laminar flame velocities. Contactless methods of measurement such as infrared thermography, interferometry, and Laser-Doppler anemometry are of particular importance. By means of selected gas mixtures it is shown that the composition of the gas mixture, the initial temperature and, as far as explosion limits are concerned, also the type of ignition source are important parameters. Finally, the influence of additives is reported which even in relatively small quantities strongly modify the whole combustion process and are therefore also relevant in safety problems.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
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