الفهرس 
Trace Elelment
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Abstract
hnc Ls an essenttal trace element in man, it
is estimated that the total body content is 2-3 qm.
UIl9 ~.~ llrr9’i’Uny ’9’ 9Y’r[ ~QQ ;;~R~ m~~~J,loen::yme$
incbdirV:J cQrb<mic a.nhydn~e, b,ctil.te dehyd:;Qgenue,
alkaline phosph,atase, carboxypeptidase and many others.
It also plays an impoJ:tant role in non-enzymatic
fre,e radical reactions. The most crItical rol’e of
zinc in biochemical process is its involvement in
the metabolism of polynucleotides in ribonu’cleic
acid and deoxyribonucleio acid synthesis, and deficienoy
of zinc has been demOnstrated ’to inhibit the forma.tion
of these nucreac acids r Halsted et al. I 19141.
Zinc is widely distributed in human tissues,
being present in higb. concentration in the retina,
musoles, liver, kidney and hair. Studies have revealed
zinc concentration in the plasma in the range of
76 to 222 ”,go/dl il’ladull;.!; (liq:lsted et <l:J.., 1974 I.
’the major di’etary sources of zinc are food of
animal origin such as meat, fish, shellfish. poultry.
e99sand dairy products (Murphy et a1., 197:S). The
National Acadamy of Sciences has recommended the