In this paper,we present and analyze a simple model for a chemostat with two microorganisms and periodically pulsed substrate. We obtain an exact periodic solution with positive concentrations of substrate and one of the microorganism. Further,we prove that the periodic solution is stable if the impulsive period is less than some critical value.

We obtain the exact periodic solutions with positive concentrations of substrate and one of the microorganisms,and meanwhile we obtain also the two microorganisms extinction periodic solution,further,we establish sufficient conditions for the periodic solution is stable.

Two patterns of ATP regeneration system were discussed in this paper, that is self coupling reaction system and coupling reaction system between two microorganisms. Based on the discussion of the application of this two systems in the production of GMP, ATP, IMP, GSH and CDP choline, the essential conditions for establishment of ATP regeneration were developed and the problems of such a coupling system were analyzed in order to provide reference to studies of this field in our country.

An ATP regeneration system between two microorganisms,in which recombinant E. coli Ⅱ 1 and \%S. cerevisiae\% WSH\|J702 were used as the biosynthesis enzymes source of glutathione and ATP,respectively,was constructed by using glucose as an energy substrate.

In this paper, by using the center manifold theorem we obtain the conditions of the existence of the Hopf bifurcation, and the limit cycles in a 3-D continuous culture vessel model of two microorganisms competing for a single reproductive nutrient organism. It is proved that the nonlinear oscillatory phenomenon also exists in this kind of bio-reactor model.

Higher racemic oligomers were slowly assimilated by the two microorganisms, whereas higher L-oligomers appeared biostable probably because of their crystallinity.

Under the selected conditions,DL- andL-lactic acids were totally used by the two microorganisms regardless of the enantiomeric composition.

A dual inoculum made of calcium alginate beads containing the two microorganisms appears to be a valuable technique for increasing the efficiency of ectomycorrhizal inoculation of planting stocks in forest nurseries.

A three dimensional chemostat with two microorganisms which are both with quadratic yields is studied.

A three-dimensional chemostat with two microorganisms which are both with quadratic yields is studied.

The construction of ATP regeneration system is an effective approach for improving an economical biosynthesis enzyme reaction. Two patterns of ATP regeneration system were discussed in this paper, that is self coupling reaction system and coupling reaction system between two microorganisms. Based on the discussion of the application of this two systems in the production of GMP, ATP, IMP, GSH and CDP choline, the essential conditions for establishment of ATP regeneration were developed and the problems...

The construction of ATP regeneration system is an effective approach for improving an economical biosynthesis enzyme reaction. Two patterns of ATP regeneration system were discussed in this paper, that is self coupling reaction system and coupling reaction system between two microorganisms. Based on the discussion of the application of this two systems in the production of GMP, ATP, IMP, GSH and CDP choline, the essential conditions for establishment of ATP regeneration were developed and the problems of such a coupling system were analyzed in order to provide reference to studies of this field in our country.

An ATP regeneration system between two microorganisms,in which recombinant E.coli Ⅱ 1 and \%S.cerevisiae\% WSH\|J702 were used as the biosynthesis enzymes source of glutathione and ATP,respectively,was constructed by using glucose as an energy substrate.Yeast cells after permeable treatment could hardly consume glucose.The glycolysis pathway of yeast was started by adding 1.0mmol/L AMP and 0 05mmol/L NADH simultaneously.GSH biosynthesis in the coupling system was improved with increasing glucose concentration...

An ATP regeneration system between two microorganisms,in which recombinant E.coli Ⅱ 1 and \%S.cerevisiae\% WSH\|J702 were used as the biosynthesis enzymes source of glutathione and ATP,respectively,was constructed by using glucose as an energy substrate.Yeast cells after permeable treatment could hardly consume glucose.The glycolysis pathway of yeast was started by adding 1.0mmol/L AMP and 0 05mmol/L NADH simultaneously.GSH biosynthesis in the coupling system was improved with increasing glucose concentration to 400mmol/L,where the concentration of GSH reached 10 4mmol/L (3 2g/L).Both the coupling system and the non\|coupling system with ATP added could hardly produce GSH under the absence of magnesium.The low efficiency of ATP regeneration system constructed was probably caused by the chelation between magnesium and ATP.By adding magnesium to the coupling system,a final concentration of GSH,14 3mmol/L (4 4g/L),was achieved at 6h of reaction.