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  • 1
    Electronic Resource
    Electronic Resource
    Mass spectrometric measurements of steady-state kinetics of cyanobacterial nitrogen fixation by monitoring dissolved N2 in an open system (1981)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 12 (1981), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1981.tb07607.x
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of Changes of Blood Volume on the Concentration of Aldosterone in Peripheral Plasma of Intact Unanæsthetized Dogs (1961)
    [s.l.] : Nature Publishing Group
    Nature 190 (1961), S. 352-353 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The double-isotope derivative method for determ ination of cortisol described by Bojesen2 has been refined to the low level of aldosterone in peripheral plasma8. Using this method, we have examined the effect of bleeding, blood transfusion, infusion of a dog Ringer's solution, and infusion of dog ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/190352a0
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  • 3
    Electronic Resource
    Electronic Resource
    Steady-State Oxvgen Kinetics of Terminal Oxidases in Trypanosoma mega (1977)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 24 (1977), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Steady-state oxygen kinetics of Trypanosoma mega reveal the presence of 3 oxidases. These include an oxidase which is sensitive to salicylhydroxamic acid (SHAM) but insensitive to sodium azide. This oxidase could be the L-α glycerophosphate oxidase present in bloodstream trypanosomes. In addition, an oxidase is present which is azide-sensitive but SHAM-insensitive. This oxidase is inhibited by CO and is probably cytochrome aa3. A 3rd oxidase is insensitive to both azide and SHAM but is inhibited by CO and is possibly cytochrome o. Reciprocal plots of T. mega reveal the presence of 2 oxidases that are inhibited by CO. These results are discussed in the light of previous evidence suggesting the presence of several oxidases and a branched electron transport system in T. mega.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1977.tb01015.x
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  • 4
    Electronic Resource
    Electronic Resource
    Mass spectrometric measurements of methane and oxygen utilization by methanotrophic bacteria (1983)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 20 (1983), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract A mass spectrometer with membrane inlet was used to measure methane and oxygen utilization rates at various methane concentrations in Methylosinus trichosporium and a locally isolated strain of a methane-oxidizing coccus (OU-4-1). The apparent Km for methane was found to be 2 μM for M. trichosporium and 0.8 μM for strain OU-4-1. These Km-values are 10–30 times lower than most previously reported values. The ratio of oxygen to methane utilization rates was 1.7 for M. trichosporium and 1.5 for strain OU-4-1 corresponding to a growth yield of 0.38 and 0.63 g dry weight/g methane, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1983.tb00142.x
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  • 5
    Electronic Resource
    Electronic Resource
    BISTABILITY, OSCILLATION, AND CHAOS IN AN ENZYME REACTION (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 316 (1979), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1979.tb29503.x
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  • 6
    Electronic Resource
    Electronic Resource
    The acoustic behavior of four species of vespertilionid bats studied in the field (1981)
    Springer
    Journal of comparative physiology 142 (1981), S. 67-74 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The acoustic behavior of four species of Vespertilionid bats flying in the field was studied using high speed tape recorders and ultrasonic detectors. The bats can be identified solely on the basis of their cries when using a ‘divide-by-ten’ detector. Three species (Eptesicus serotinus, Nyctalus noctula, andPipistrellus pipistrellus) show considerable flexibility in their acoustic behavior, whileMyotis daubentoni has a stereotyped acoustic behavior under our study conditions. Several aspects of the cry repertoire can be correlated with the bats' activities and acoustic environment. During aerial chases and when circling the roost,E. serotinus, N. noctula andP. pipistrellus emit ultrasound that is distinctly different from their orientational cries. Such ultrasound may have a social function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00605477
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  • 7
    Electronic Resource
    Electronic Resource
    Chaos in an enzyme reaction (1977)
    [s.l.] : Nature Publishing Group
    Nature 267 (1977), S. 177-178 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Oscillations in oxygen concentration in peroxidase catalysed oxidation of NADH in system open to O2. A stirred 5 ml sample containing horseradish peroxidase, 10 uM 2,4-dichlorophenol and 0.2 jaM methylene blue in a 0.1 M Na-acetate buffer p.H 5.1 was in contact with an O2/N2 gas mixture at ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/267177a0
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  • 8
    Electronic Resource
    Electronic Resource
    Bistability caused by Substrate Inhibition of Peroxidase in an Open Reaction System (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 1047-1050 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The reaction used in the experiment is the oxidation of NADH by O2 catalysed by horseradish peroxidase. This reaction was studied in an open system by Yamazaki etal.7〉s* who found the reaction to be autocatalytic and that damped oscillations in the oxygen concentration of the solution may ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2171047b0
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  • 9
    Electronic Resource
    Electronic Resource
    Inhibition by ammonia of methane utilization in Methylococcus capsulatus (Bath) (1991)
    Springer
    Applied microbiology and biotechnology 35 (1991), S. 124-127 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The kinetics of methane uptake by Methylococcus capsulatus (Bath) and its inhibition by ammonia were studied by stopped-flow membrane-inlet mass spectrometry. Measurements were done on suspensions of cells grown in high- and low-copper media. With both types of cells the kinetics of methane uptake are hyperbolic when oxygen is in excess. The apparent K m and K max for methane uptake are both higher in low-copper cells than in high-copper cells. Ammonia is a simple competitive inhibitor of methane uptake in high-copper cells when the oxygen concentration is above a few μM. The findings agree with the assumption that ammonia is a week alternative substrate for particulate methane monooxygenase. In low-copper cells the effect of ammonia is complicated and cannot be explained in terms of current assumptions on the mechanism of soluble methane monooxygenase. Our data indicate that ammonia inhibition is likely to be a more serious problem in connection with cultivation in low-copper medium than in high-copper medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00180649
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  • 10
    Electronic Resource
    Electronic Resource
    Growth rate and methane affinity of a turbidostatic and oxystatic continuous culture ofMethylococcus capsulatus (Bath) (1987)
    Springer
    Biotechnology letters 9 (1987), S. 71-76 
    Details
    ISSN: 1573-6776
    Keywords: Methanotrophic bacteria ; copper deficient medium ; methane saturation constant ; methane affinity ; specific growth rate ; membrane inlet mass spectrometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A turbidostatic and oxystatic fermentation system was used to study the growth kinetic ofMethylococcus capsulatus (Bath). Dissolved oxygen and methane concentrations were measured continuously with membrane inlet mass spectrometry. The specific growth rate was found to increase from 0.25 h−1 to 0.37 h−1 and the saturation constant for methane was found to decrease from 71 μM to 1.3 μM as the copper content of the medium was varied from a very low to a high value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01043398
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