effect of heavy metals on microbial activity insome ecosystems / Mohamed Nasr Leithy ; Supervised Mohamed Zakaria Sedik , Zahira Said Tawfik

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Mohamed Nasr Leithy

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Language: Eng Publication details: Cairo : Mohamed Nasr Leithy , 2006Description: 133p : ill ; 25cmOther title:

تاثير المعادن الثقيلة على النشاط الميكروبى فى بعض الاوساط البيئية [Added title page title]

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Dissertation note: Thesis (PH.D.) - Cairo University - Faculty Of Agriculture - Department Of Microbiology Summary: 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

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Holdings
Item type	Current library	Home library	Call number	Copy number	Status	Barcode
Thesis	قاعة الرسائل الجامعية - الدور الاول	المكتبة المركزبة الجديدة - جامعة القاهرة	Cai01.07.06.Ph.D.2006.Mo.E. (Browse shelf(Opens below))		Not for loan	01010110045786000
CD - Rom	مخـــزن الرســائل الجـــامعية - البدروم	المكتبة المركزبة الجديدة - جامعة القاهرة	Cai01.07.06.Ph.D.2006.Mo.E. (Browse shelf(Opens below))	45786.CD	Not for loan	01020110045786000

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

Issued also as CD

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