t-,/rrr',r47c

EI
I1*as obs€Ned tat !t l% levcl of molasss, biomess prorein yield
increaed from 16.037010 17.E60lo aft€r setting carbon to ritrogen ralio. However
lhis yield wd not sigiificandy higher than thal of contfol, t7.5% (wilhout
'nol8cs). This ag.in indicated rhat rhe subsrnre (rie polishirgs) @nlained
suflicient soluble c€rbohyd6t6 and pmbably suppleme ing $. growth medium
wilh nolasea, is no( nccded. An incrss€ in prclcin contenr of yeest from 2E.l ro
51.0% wa5 rcporled by Osman and Voino (1976) when the sugar level was kepr
constant and CrN ratio decr$sed frcm 17 to 8. Howev€r, lie bionass prorein yi€td
likqis. dropped frcm 18 to 12 glilrc. Cebon !o nitrog€n ario of tort ws found
10 b€ the optmum for diffcrent ki.ds of subsrare undq differcnl fcrmentation
coditions (ldnmenl ?r al., I9?8-a fld Abduttah e, dl 1985)_ the vsriations in
oprimum ca$on to nirrogen ratios could be due b $e kind of subsr.ares fern€nled
(Kiani .r a/. 1989 md B6hir. 1990) s the subsrare wa! defarled dce polishjngs in
fi61case and whcat bran in second casc. Thc oprimum carbon to nikoSen mrio was
Iotnd to be 12.5:l wirh Can lad dilir.
Lower crrbon ro nitroscn mri6 12.1, 4.46tt, 7:l and 5:t) werc
feporrcd lor opimum biomoss protein production (She arr, t9j5 i Crmat et al.,
1985 i Alram, 1992 sd Malmood-ut,Hassd, 1992) whcr€js Hajhmj (1987),
Hashmi .r d/. (t989), {jhanem et at. (1991) and Athar €/ a/. (t995) reDon€d
.cspectively higficr C:N dios of tJ:1, 25:1, 2j:l ed l5rl for oDrimum biomass
protein yield. Thc va.idions in rll€s Etios e.E due 0o eirhcr dilTcr€ncc in kind of
inicerganism used fo. fenhenraftn or diffcMc. in kind of substtarc femdted.
These lindings suppon $e fact that diffcr€nr kinds of microorganisms hav.
direrent requireDents fo. niliogcn for dsiDitaling €$on for prorein synthesh.
Howev.r rcpod! cisls whcrc different C:N ratio (15:l) for the 3ame or8&nism nd
$ne subscale (Mrl'm@d d al, 1990),nd @bon 10 nirrogo mrio of25:t fo.
s4ne o€oism bur fo. differe subsrlle (Bajwa €l dr, 199 | ) werc obseded.