effect of heavy metals on microbial activity insome ecosystems /
Mohamed Nasr Leithy
effect of heavy metals on microbial activity insome ecosystems / تاثير المعادن الثقيلة على النشاط الميكروبى فى بعض الاوساط البيئية Mohamed Nasr Leithy ; Supervised Mohamed Zakaria Sedik , Zahira Said Tawfik - Cairo : Mohamed Nasr Leithy , 2006 - 133p : ill ; 25cm
Thesis (PH.D.) - Cairo University - Faculty Of Agriculture - Department Of Microbiology
The effect of four metal concentrations , as well as , six Gamma - irradiation doses on the activity of cellulase , urease and dehydrogenase was determinedApplication of heavy metals at any rate caused noticeable reduction in their activity depending upon the metal type and concentrationEven at the low concentration , Cr6+followed by Hg2+had the most harmful effect on the enzymatic activities , while Pb2+showed the least toxicitySoil exposure to Gamma - irradiation differently affected the enzymatic activitiesThis varied from stimulating effect on urease to suppressive one on dehydrogenaseGenerally , the high doses of - rays inhibited the activity of the three enzymes and dehydrogenase proved to be the most susceptible enzyme toward radiation
Heavymetals Organic motter soil pollution
effect of heavy metals on microbial activity insome ecosystems / تاثير المعادن الثقيلة على النشاط الميكروبى فى بعض الاوساط البيئية Mohamed Nasr Leithy ; Supervised Mohamed Zakaria Sedik , Zahira Said Tawfik - Cairo : Mohamed Nasr Leithy , 2006 - 133p : ill ; 25cm
Thesis (PH.D.) - Cairo University - Faculty Of Agriculture - Department Of Microbiology
The effect of four metal concentrations , as well as , six Gamma - irradiation doses on the activity of cellulase , urease and dehydrogenase was determinedApplication of heavy metals at any rate caused noticeable reduction in their activity depending upon the metal type and concentrationEven at the low concentration , Cr6+followed by Hg2+had the most harmful effect on the enzymatic activities , while Pb2+showed the least toxicitySoil exposure to Gamma - irradiation differently affected the enzymatic activitiesThis varied from stimulating effect on urease to suppressive one on dehydrogenaseGenerally , the high doses of - rays inhibited the activity of the three enzymes and dehydrogenase proved to be the most susceptible enzyme toward radiation
Heavymetals Organic motter soil pollution