Starch-g-polyacrylonitrile (starch-g-PAN) copolymers were prepared by ceric ammonium nitrate initiation, and the major portion of the starch in these graft copolymers was then removed by acid hydrolysis to yield PAN with oligosaccharide end groups. Although these PAN-oligosaccharide samples reacted with methyl methacrylate in the presence of eerie ammonium nitrate, the resulting products were l...

A sequential injection system was proposed to accomplish the potentiometric determination of urea. This procedure used an ammonium tubular selective electrode to assess ammonium concentration produced by enzymatic hydrolysis of urea from Jack bean meal (Canavalia ensiformis DC) crude extract. A gaseous diffusion device was coupled to the flow set-up allowing on-line sampling and suitable select...

Microbial phytases were applied mainly to animal and human foodstuffs in order to improvemineral bioavailability and food processing. In addition, phytases have potentialbiotechnological application in various other fields, such as environmental protection,aquaculture and agriculture. Bacillus sp. DM12, an isolate from a hot spring, produces phytase,which catalyzes the hydrolysis of phytic acid...

Alkali-assisted acid pretreated rice straw was saccharified using cellulase from Aspergillus niger BK01. The cellulase production by the fungus was enhanced by parametric optimization using solid-state fermentation conditions. Maximum cellulase production (12.0 U/gds of carboxymethyl cellulase, CMCase) was achieved in 96 h, using 6.0% substrate concentration, 7.5% inoculum concentration, 1:2 so...

An enzyme which catalyzes the hydrolytic cleavage of various ribonucleosides to free base and ribose components has been obtained from cells of Pseudomonas fluorescens and purified about 300-fold by fractionation with protamine sulfate, ammonium sulfate, alumina Cy, and diethylaminoethyl cellulose. The preparation thus purEed catalyzes the hydrolysis of about 50 moles of uridine per min per mg ...

An enzyme which catalyzes the hydrolytic cleavage of various ribonucleosides to free base and ribose components has been obtained from cells of Pseudomonas fluorescens and purified about 300-fold by fractionation with protamine sulfate, ammonium sulfate, alumina Cy, and diethylaminoethyl cellulose. The preparation thus purEed catalyzes the hydrolysis of about 50 moles of uridine per min per mg ...

An enzyme hydrolyzing diadenosine 5',5"'P1, P4-tetraphosphate (Ap4A) to AMP and ATP has been purified to apparent homogeneity from mouse liver cell extracts. The isolation procedure comprised ammonium sulfate precipitation, chromatography on Sephadex G-75. DEAE-cellulose, blue Sepharose and AMP-Sepharose. The enzyme is a single polypeptide chain with a native Mr = 64,000 with a Km of 1.66 micro...

An enzyme hydrolyzing diadenosine 5’,5”’-P1,P4-tetraphosphate (Ap4A) to AMP and ATP has been purified to apparent homogeneity from mouse liver cell extracts. The isolation procedure comprised ammonium sulfate precipitation, chromatography on Sephadex G75, DEAEhellulose, blue Sepharose and AMP-Sepharose. The enzyme is a single polypeptide chain with a native M, = 64,000 with a K,,, of 1.66 PM an...

protein recovery under sonication treatment and autolysis, also protein hydrolysis progress during enzymatic hydrolysis (using trypsin and chymotrypsin) and autolysis (using endogenous enzymes) were investigated in saccharomyces cerevisiae and kluyveromyces marxianus. crude protein content of dried yeast cells were 53.22% and 45.6% for s.cerevisiae and k.marxianus, respectively. after 96 hrs of...