Motivated by investigating multistationarity in biochemical systems, we address saddle-node bifurcations for chemical reaction networks endowed with general kinetics. At positive equilibria, identify structural network conditions that guarantee the bifurcation behavior, and develop a method to proper parameters. As relevant example, explicitly provide such parameters Michaelis–Menten Hill Examp...

Phenyldiazene reacted with lymphoblast-expressed CYP3A4 to give a stable phenyl-iron complex that could be induced to rearrange in situ producing approximately equal amounts of four N-phenyl-protoporphyrin IX isomers (N(B):N(A):N(C):N(D), 01:01:02:02). In the presence of 10 mM MgCl(2), the formation profile of the protoporphyrin isomers was markedly altered compared with control, favoring the N...

In this paper, we generalize the models used by MacKay [1] in his analysis of evolutionary strategies that are based on sexual, rather than asexual, reproduction methods. This analysis can contribute to the understanding of the relative power of genetic algorithms over search methods based upon stochastic hill-climbing, e.g. [2], [3].

Inulosucrases catalyze transfer of a fructose moiety from sucrose to a water molecule (hydrolysis) or to an acceptor molecule (transferase), yielding inulin. Bacterial inulin production is rare and a biochemical analysis of inulosucrase enzymes has not been reported. Here we report biochemical characteristics of a purified recombinant inulosucrase enzyme from Lactobacillus reuteri. It displayed...

A thermokinetic model of hydrogen diffusion across a metallic tube is established. It includes the enthalpy change of the metal– hydrogen reaction, heat losses, dependences of reaction rate and hydrogen diffusion coefficient on temperature, and self-stress effects, etc. A phenomenon, the super fast diffusion of hydrogen before the up-hill diffusion and Fickian diffusion during hydrogen gas char...

introduction: spatial variation of soil properties is significantly influenced by numerous environmental factors such as landscape features, including position, topography, slope gradient and aspect, parent material, climate and vegetation. soil properties vary spatially in south- and north-facing hill slopes. this factor (different slope aspects) can affect the distribution of soil organic mat...