The Influence of Roentgen Rays upon the Nitrogen Fixation by Azotobacter
نویسندگان
چکیده
The influence of graded x-ray doses upon nitrogen fixation and respiration by Azotobacter was studied by means of the Warburg method. It was found that nitrogen fixation decreases approximately linearly with increasing x-ray doses. Respiration in contrast is affected only indirectly through some inhibition of cell multiplication. Small doses of x-ray often produce a slight and transient increase in the rate of oxygen uptake.
منابع مشابه
Utilization of Fixed Nitrogen by Azotobacter and Influence on Nitrogen Fixation.
The influence of fixed nitrogen on Azotobacter both with respect to utilization and inhibition of nitrogen fixation has been studied by a number of investigators. The results have not always been conclusive because of the relatively poor growths of cultures obtained in culture media now known to have been deficient in one or more of the elements essential for nitrogen fixation or growth, partic...
متن کاملاثر پتانسیل‌های محرک رشد سویه‌های بومی ازتوباکتر کروکوکوم روی رشد، عملکرد و جذب عناصر غذایی در گندم
Azotobacter chroococcum is an important PGPR (Plant Growth Promoting Rhizobacteria) producing compounds needed for plant growth. The aim of this research was to study the effects of different native strains of Azotobacter chroococcum on growth and yield of wheat under greenhouse counditions. Seeds of spring wheat (Triticum aestivum L. var. Pishtaz) were inoculated with some Azotobacter chroococ...
متن کاملاثر پتانسیل‌های محرک رشد سویه‌های بومی ازتوباکتر کروکوکوم روی رشد، عملکرد و جذب عناصر غذایی در گندم
Azotobacter chroococcum is an important PGPR (Plant Growth Promoting Rhizobacteria) producing compounds needed for plant growth. The aim of this research was to study the effects of different native strains of Azotobacter chroococcum on growth and yield of wheat under greenhouse counditions. Seeds of spring wheat (Triticum aestivum L. var. Pishtaz) were inoculated with some Azotobacter chroococ...
متن کاملIsolation and characterization of a second nitrogenase Fe-protein from Azotobacter vinelandii.
Wild-type Azotobacter vinelandii strain UW was transformed with plasmid pDB12 to produce a species (LS10) unable to synthesize the structural proteins of component 1 and component 2 of native nitrogenase. A spontaneous mutant of this strain was isolated (LS15) which can grow by nitrogen fixation in the presence or absence of either Mo or W. It is proposed that LS15 fixes nitrogen solely by an a...
متن کاملAzotobacter : A Plant Growth - Promoting Rhizobacteria Used as Biofertilizer
Nitrogen fixation is mainly responsible for improvement of crop yield. In this regard, diazotrophs like Rhizobium, Azotobacter and Azospirillum are important as they enrich nitrogen nutrition in N-deficient soils. Of these, Azotobacter promotes plant growth as well as nitrogen fixation. Thus technology has been developed for making use of Azotobacter biofertilizer for nitrogen and non-nitrogen ...
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ورودعنوان ژورنال:
- The Journal of General Physiology
دوره 24 شماره
صفحات -
تاریخ انتشار 1941