ENZYMATIC ACTIVITY OF NITROSOMONAS EXTRACTS
نویسندگان
چکیده
منابع مشابه
Enzymatic activity of Nitrosomonas extracts.
The sole energy-yielding reaction of the autotrophic nitrifying bacterium Nitrosomonas europaea involves the conversion of ammonium to nmtrite. As early as 1926, Kluyver and Donker postulated that the six electron oxidation proceeds with the intermediary formation of hydroxylamine and hyponitrous acid. Only recently have there been any studies of the biochemical mechanism of chemoautotrophic am...
متن کاملPhosphorylation by extracts of Nitrosomonas europaea.
Burge, W. D. (University of California, Berkeley), E. Malavolta, and C. C. Delwiche. Phosphorylation by extracts of Nitrosomonas europaea. J. Bacteriol. 85:106-110. 1963.-Cellfree preparations of Nitrosomonas europaea are capable of oxidizing hydroxylamine, but not ammonium ion, to nitrite. The quantity of nitrite formed by our preparations was, at most, equivalent to only 70% of the hydroxylam...
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Saccharomyces cerevisiae (S. cerevisiae) (commonly known as baker's yeast) is a model organism that has a similar upstream base excision repair (BER) pathway for the repair of methylated bases as that in mammalian cells, and it is very easy to maintain in the laboratory environment. Here, we described a method to prepare cell extracts from yeast to investigate their enzymatic activities. This p...
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in this work, a novel and fast method for direct analysis of volatile compounds (davc) of medicinal plants has been developed by holding a filament from different parts of a plant in the gc injection port. the extraction and analysis of volatile components of a small amount of plant were carried out in one-step without any sample preparation. after optimization of temperature, extraction time a...
Optimized enzymatic colorimetric assay for determination of hydrogen peroxide (H2O2) scavenging activity of plant extracts
The classical method to determine hydrogen peroxide (H2O2) scavenging activity of plant extracts is evaluated by measuring the disappearance of H2O2 at a wavelength of 230 nm. Since this method suffers from the interference of phenolics having strong absorption in the UV region, a simple and rapid colorimetric assay was developed where plant extracts are introduced to H2O2, phenol and 4-aminoan...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1959
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.78.6.796-799.1959