This work describes the growth of filamentous fungi in biofilters for the degradation of hydrophobic VOCs. The study system was n-hexane and Fusarium solani B1. The system is mathematically described and the main physical, kinetic data and morphological parameters were obtained by independent experiments and validated with data from laboratory experiments. The model describes the increase in th...

In this work the aerobic degradation of phenol (PH), catechol (CA), resorcinol (RE), hydroquinone (HY) and of the binary mixtures PH+CA, PH+RE, PH+HY by phenol-acclimated activated sludge was studied. Single substrate experiments show a Haldane-type dependence of the respiration rate on PH, RE and HY, while CA corresponded to the Monod model. Binary substrate experiments demonstrated that the p...

Abstract Biological reactors are employed in industrial applications to break down organic waste. We view the cascade of two open loop continuously stirred tank with Haldane growth function as chemostats bacterial inputs. A some reactor parameters is derived, sign which determines maximum number critical points a can have. This allows us determine parameter combinations ensure has only single p...

Microbial conversion of crude and purified glycerol obtained in the process of biorefining Crotalaria juncea is carried out to produce succinic acid using Escherichia coli. Batch tests are performed for nine different substrate concentrations of commercial, purified and crude glycerol, in order to observe cell growth and substrate utilization rate. Inhibitory (Halden-Andrew, Aiba-Edward, Tessie...

This paper is devoted to the existence of periodic solutions for a semi-ratio-dependent predatorprey system with time delays on time scales. With the help of a continuation theorem based on coincidence degree theory, we establish necessary and sufficient conditions for the existence of periodic solutions. Our results show that for the most monotonic prey growth such as the logistic, the Gilpin,...

This paper deals with a model of a biochemical reactor system with distributed parameters and with a time delay in the growth response. Time delay has been introduced in microbial growth systems to explain the time lapse between the consumption of (liquid) substrate and its conversion to (solid) biomass. We study here the properties of the resulting system of partial functional differential equ...

Explanation: Monod sign indicates the presence of a mycetoma within a lung cavity. This radiographic appearance of a “uniform, rounded opacity which isytopped by a clear crescent” was described in 1954 by Pesle and Monod.1 Free movement of the mass helps distinguish Monod sign from similar-appearing radiographic signs in which the lesion is fixed, and supports the presence of a mycetoma. Howeve...

The kinetics of induction of the galactozymase of certain yeasts (Spiegelman, 1951) and the permease-3-galactosidase system of Escherichia coli (Monod, 1956) can, under certain conditions, be described as autocatalytic. Essentially two hypotheses have been proposed to account for such findings: (a) that the enzyme-forming system itself is autocatalytically activated (Campbell and Spiegelman, 19...

References 1 E Mayr. Animal species and evolution. Cambridge, Mass.: Harvard University Press, 1963. 2 Mayr E. Sympos. Quant. Biol., 24:I, 1959 3 J.B.S. Haldane. Trans. Cambridge Phil. Soc., 23:19, 1924 4 J.B.S. Haldane and S. D. Jayakar. J. Genet., 58:291, 1963 5 R.C. Punnett. J. Hered., 8:464, 1917 6 L.T. Hogben. In: M.P Banton (ed). Darwinism and the study of society. London: Travistock Publ...