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J7<br />
nported lllat lhc f€mentation widr Prttplir was stronSly dcpcnd€nt on o(ygen<br />
lra sfer mle (OTR). On $e basis ofotR values the relationship betwen optimum<br />
spcrific oxysen lptakc ruLc (qot and m!:(imun specific cthanol production (q!-<br />
md) w6 evaluated. Tlte oplimum qo, for ctheol prcduclion was 14.3 and 66.7 mg<br />
G ccllr,A'r) when xyloce md glu@se *rs us.d $ t'e qfton souM 6psriv.ly.<br />
Whe! a oixturc ofaluc@ ud x/@ wa usld d lhe clrbon su@ in a culturc of<br />
erriptir alone, fi. yicld 8nd prcduclivity of eltool wse significetly enhdced ai<br />
qo: adjBt€d to an optinm level dep.ndcnt on the typ. ofsugaf @nsmed. Tley<br />
obseN.d that thc co{ulturc oflhese lwo organisms r€sulted in mar-yield ed ftc<br />
highert Foductivily of ethaDol, from a mixture of xylo6. and 8luco6€, because qoz<br />
for xylose fem.ntation by Prr;Dtit ws$ suGsfiily mlinbincd due lo the loq<br />
oxygen consmption by th€ mulart y€ast stnin.<br />
Taniguchi dl di. (1997-b) develop.d a novel co,culture system consisling of<br />
lwo fementeB and two mimfi[eEtion moduls for effici.nt etharcl p.oducrion<br />
from a mixturc of 8l'|me and xylosc by c{)o[DE of Pi.hia stipits a d<br />
Socchuodrces .enbia.. Thay h@ulat d th. two dgdisru in a singl€ f.mcntcr<br />
whcre i1 was imposible io naintain the specific oxygen uptak. (qor) for elhanol<br />
prcduction from xylos. by Crtipirlr due to O, conlumption by AcdryiJrb.. Th.<br />
.lhanol produclion by conventiodl co.cul(w slstm ws lowd lhd a singlc<br />
culturc ofPJtlr,?ir .lon. in which qo, w3! ldjusled to e oplimum ldel depcndinS<br />
on tbo kind of suSu @nsumcd. Thc proposed cr-culture systcrh !l'o*€d re$lalion<br />
of dissolved oxyg.r concetrlralion at a level suitable for an individual y€61 in esch<br />
fcrmenler as well as successful exchang. of culture media b.lwc€n two fermenters.<br />
'Irrcy obbincd higher yields ud prcdocrivity of elhmol from a mixture of glu(rF<br />
dd xyl@ in a ncw cGcult@ s,,rt€m the h singl€ cultw ot P.ttipitis al6.-
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