The global asymptotic behavior of solutions of the variable yield model is determined. The model generalizes the classical Monod model and it assumes that the yield is an increasing function of the nutrient concentration. In contrast to the Monod model, it is demonstrated that the variable yield model exhibits sustained oscillations. Moreover, it is shown that the variable yield model may under...

Jacques Monod and Francois Jacob, our heroes, described a gene-regulatory world run exclusively by repressors. The activities of repressors, their abilities to bind DNA as we later learned, would be controlled — helped or hindered — by small molecules that bind these proteins. They showed [1] that networks of considerable complexity could be created with such a regulatory system. There was no n...

Some of these studies have been reported in a preliminary communication, Hoffee, P., and E. Englesberg, Bacteriol. Proc., 1962, p. 120. Abbreviations: ATP, adenosine triphosphate; aMG, alpha methyl D-glucopyranoside. t Predoctoral Research Fellow, U.S. Public Health Service. l Rickenberg, H. V., G. N. Cohen, G. Buttin, and J. Monod, Ann. Inst. Pasteur, 91, 829 (1956). 2 Cohen, G. N., and J. Mon...

The direct discharge of palm oil mill effluent (POME) wastewater causes serious environmental pollution due to its high chemical oxygen demand (COD) and biochemical oxygen demand (BOD). Traditional ways for POME treatment have both economical and environmental disadvantages. In this study, a membrane anaerobic system (MAS) was used as an alternative, cost effective method for treating POME. Six...

This work aims to study the production of the biomass of S. cerevisiae on an optimized medium using date extract as the only carbon source in order to obtain a good yield of the biomass. The biomass production was carried out according to the central composite experimental design (CCD) as a response surface methodology using Minitab 16 software. Indeed, under optimal biomass production conditio...