title: [Conditions for forming ethanol during bioconversion of cellulose-containing raw material].
abstract: Several natural associations composed by thermophilic anaerobic bacteria capable of utilizing various cellulose materials at 60 +/- 2 degrees C and pH 6.0-7.0 were isolated from the sludge of Kamchatka geothermal springs. The rate of ethanol production (up to 1.7 g/l per day) and the concentration of ethanol in the medium (up to 1.2%), as well as the fermentation period (10-15 days) were determined under anaerobic conditions in the presence of cellulose, coniferous sawdust, newsprint, or paper pulp as a carbon source. Microorganisms were found that inhibited the production of ethanol. The initial pH value was found to influence both the ethanol production rate and ethanol/acetate ratio. A pH decrease from 7.0 to 5.0 led to 6.7-fold increased the ethanol production and caused a 23.8-fold increase in the ethanol/acetate ratio.
authors.affiliation: State Research Institute of Protein Biosynthesis, Moscow, 109004 Russia.
authors.forename: N V
authors.initials: NV
authors.lastname: Ziabreva
authors.forename: E P
authors.initials: EP
authors.lastname: Isakova
authors.forename: V V
authors.initials: VV
authors.lastname: Biriukov
mesh_terms: D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D002482:Cellulose / Q000378:metabolism*; D000431:Ethanol / Q000378:metabolism*
chemical_list: D000431:Ethanol; D002482:Cellulose
vernacular_title: Usloviia obrazovaniia tanola pri biokonversii tselliulozosoderzhashchego syr'ia.