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Critical behavior and correlations on scale-free small-world networks: Applicat...

We analyze critical phenomena on networks generated as the union of hidden variable models (networks with any desired degree sequence) with arbitrary graphs. The resulting networks are general small worlds similar to those a la Watts and Strogatz, but with a heterogeneous degree distribution. We prove that the critical behavior (thermal or percolative) remains completely unchanged by the presence of finite loop...

Método para determinação da atividade de tanase em derivados imobilizados.

Relatar um método para a determinação da atividade de tanase imobilizada covaletemente a suportes inertes insolúveis, adaptado a partir do equivalente para enzima livre. ; 2005

Imobilização de tanase em suportes vítreos utilizando y-aminopropiltrietoxilano...

Imobilização de tanase em suportes vítreos utilizando y-aminopropiltrietoxilano (ATPS). ; 2005

Improving selectivity and productivity of the enzymatic synthesis of ampicillin...

An experimental design was applied to improve the reaction conditions for enzymatic synthesis of ampicillin from phenylglycine methyl ester (PGME) and 6-aminopenicillanic acid (6-APA), catalyzed by penicillin G acylase from E. coli immobilized on an agarose-glyoxyl derivative. The presence and magnitude of interactions between reaction variables were estimated using a 2(5) factorial design. A batch reactor was ...

Saline stress and cell toxicity evaluation using suspended plant cell cultures ...

Crop salt damage consists, usually, of leaf burn and defoliation, and it is associated with accumulation of toxic levels of sodium and/or chloride in leaf cells (Storey and Walker, 1999). The cell and tissue culture are simple biological systems that offer a direct approach to the metabolic changes. The plant cell growth in a controlled environment, as a bioreactor, is a unique tool for cell ion transport studi...

A simplified kinetic model for the side reactions occurring during the enzymati...

This work presents a kinetic study of the side reactions of the ampicillin enzymatic synthesis, from phenylglycine methyl ester and 6-aminopenicillanic acid using penicillin G acylase immobilized on agarose. A Michaelis-Menten model with competitive inhibition was fitted to initial rates of ester and antibiotic hydrolysis, at pH 6.5 and 25ºC. Inherent kinetic parameters were estimated for low enzymatic loads, t...

Lipid peroxidation, antioxidant enzymes and glutathione levels in human erythro...

The free form of the iron ion is one of the strongest oxidizing agents in the cellular environment. The effect of iron at different concentrations (0, 1, 5, 10, 50, and 100 µM Fe3+) on the normal human red blood cell (RBC) antioxidant system was evaluated in vitro by measuring total (GSH) and oxidized (GSSG) glutathione levels, and superoxide dismutase (SOD), catalase, glutathione peroxidase (GSH-Px) and reduct...

Radicais livres: conceitos, doenças relacionadas, sistema de defesa e estresse ...

Simulation Of Domain-Wall Dynamics In The 2d Anisotropic Ising-Model

The authors first show that the movement of a domain wall in a highly anisotropic Ising model of spins in two dimensions can be mapped to a random walk movement of labelled walkers in one dimension. This movement is correlated in the sense that the transition probability of a given walker, labelled i, depends upon the current positions of its labelled neighbours (i-1 and i+1). A Monte Carlo simulation of the wa...