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nitrogen control of nitrogen assimilationn2-fixer like klebsiella pneumoniae and nostoc can grow with n2 no-3 or nh4 as nitrogen source you would
regulation of ammonia assimilationheterotrophic bacteria like escherichia coli and klebsiella aerogenes induce the operation of gs-glutamate synthase
characteristics of ammonium transport systemthe following are the characteristics of ammonium transport system ammonium transport system is ammonia
uptake of ammoniaammonia nh3 diffuses freely across biological membranes according to its concentration gradient however ammonium nh4 ion requires a
ammonia assimilation - inorganic nitrogen and sulphur metabolismnitrogen n2 gas and no3 are the most common available forms of inorganic nitrogen
inhibitor proteins - enzyme-activity controlone kind of inhibitor protein found in higher plants is an endopeptidase which degrades nitrate reductase
cyanide - enzyme-activity controlplants generate cyanide from cyanogenic glucides and histidines ethylene biosynthesis is also accompanied by cyanide
enzyme synthesisnitrate assimilating system in general is known to show increase in nitrate uptake system and nitrate reductase system in the
modes of no-3 reductionaccordingly there are the following three basic modes of no-3 reduction directly dependent upon photosynthesis as in
distribution of nitrate reductase and nitrite reductaselet us see whether nitrate assimilation depends upon the reductants produced in photosynthesis
nitrate uptakenitrate must enter the cells before undergoing assimilatory reduction by the joint action of nitrate reductase and nitrite reductase
measurement of nitrogenase activitythere are various methods to find out whether an organism is a n2-fixer or not if an organism can grow in normal
genetics of nitrogen-fixationthe genetics of nitrogen-fixation is known in detail in klebsiella pneumoniae there are twenty genes required in
leghaemoglobin - factors influencing functions of nitrogenaseleghaemoglobin is a joint product of rhizobium and the host it is produced during the
conformational protection - azotobacterin conformational protection a fe-s redox protein provides protection to the enzyme the protein gets oxidised
respiratory protection - azotobacterin respiratory protection n2-fixing cells adjust the rate of aerobic respiration according to prevailing oxygen
azotobacterazotobacter is known to possess the following two mechanisms to protect its nitrogenase from oxygen inhibition respiratory protection and
oxygen - factors influencing functions of nitrogenaseoxygen is a strong inhibitor of n2-fixation because it blocks both the synthesis as well as the
molecular hydrogenn2-fixing organisms also produce a membrane bound enzyme called uptake-hydrogenase under n2-fixing condition the physiological
molybdenum and vanadium - inorganic nitrogen and sulphur metabolismmolybdenum must be available in nature in order to meet the demand of mo for the
categories of gifted speciesthis group of nitrogen fixers has been divided into three categoriesrhizobium which includes fast growing
biological nitrogen-fixationthe process by which molecular nitrogen n2 is reduced to ammonia nh3 is called nitrogen-fixation n2-fixation this is the
inorganic nitrogen and sulphur metabolismproductivity in agriculture forestry and other ecosystems is basically limited by the availability of
protoplasmic streaming and tubular peristaltic flow modelthe first of the above two models involves the well known phenomenon of cytoplasmic
advantage and disadvantages of fensom and ner electroosmotic flow hypothesisthe model has several advantages over munchs model the presence of p-