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Mostrando ítems 51-60 de 192
Artículo
Regulation of glutamine synthetase activity in the unicellular cyanobacterium Synechocystis sp. strain PCC 6803 by the nitrogen source: Effect of ammonium
(American Society for Microbiology, 1991)
Glutamine synthetase activity from Synechocystis sp. strain PCC 6803 is regulated as a function of the nitrogen source available in the medium. Addition of 0.25 mM NH4Cl to nitrate-grown cells promotes a clear short-term ...
Artículo
Continuous cooling of a one-dimensional bonded fluid: A Monte Carlo simulation study
(American Institute of Physics Publising LLC, 1991)
A kinetic one-dimensional bonded fluid model is formulated by extending a model for water due to Bell. The behavior of the system under continuous cooling is analyzed by use of a Monte Carlo simulation method. It shows a ...
Artículo
Changes of ploidy during the Azotobacter vinelandii growth cycle
(American Society for Microbiology, 1994)
The size of the Azotobacter vinelandii chromosome is ~4,700 kb, as calculated by pulsed-field electrophoretic separation of fragments digested with the rarely cutting endonucleases SpeI and SwaI. Surveys of DNA content per ...
Artículo
Thermally driven escape over a barrier of arbitrary shape
(AIP Publishing, 1999)
The Kramers theory for the thermally activated rate of escape of a Brownian particle from a potential well is extended to a barrier of arbitrary shape. The extension is based on an approximate solution of the underlying ...
Artículo
Study of lanthanum local structure in montmorillonite
(Japan Society of Applied Physics, 1993)
The local structure of the interlamellar lanthanide ions in montmorillonite upon heating is studied. The analysis of the EXAFS data has been carried out using two model environments, that of La3+ aquocomplex and that of ...
Artículo
Suppression of the pleiotropic effects of HisH and HisF overproduction identifies four novel loci on the Salmonella typhimurium chromosome: osmH, sfiW, sfiX, and sfiY
(American Society for Microbiology, 1995)
Insertion mutations that suppress some or all the pleiotropic effects of HisH and HisF overproduction were obtained by using transposons Tn10dTet and Tn10dCam. All suppressor mutations proved to be recessive, indicating ...
Artículo
Postprocessing the Galerkin method: the finite-element case
(Society for Industrial and Applied Mathematics, 2006)
A postprocessing technique, developed earlier for spectral methods, is extended here to Galerkin nite-element methods for dissipative evolution partial di erential equations. The postprocessing amounts to solving a ...
Artículo
Steady uniform shear flow in a low density granular gas
(American Physical Society, 1997)
The steady uniform shear flow of a low density granular sytem is studied by means of a kinetic model equation and also by direct Monte Carlo simulation of the Boltzmann equation. The former can be exactly solved for arbitrary ...
Artículo
Resonant activation in a simple kinetic model
(American Physical Society, 1994)
We present a very simple Markovian kinetic model displaying a stochastic resonant behavior which is similar to the one found in the escape of a particle over a fluctuating potential barrier. The basic mechanism that is ...
Artículo
A geometrical coefficient implying the fixed point property and stability results
(University of Houston, 1996)
In this paper we define a new geometric constant M(X) in Banach spaces such that X has the fixed point property for nonexpansive mappings if M(X) > 1. We prove that M(X) •_ WCS(X), the inequality being strict in many ...