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Effects of Different Preservation Methods on Activity of Recombinant E. coli 被引量:3
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作者 ZHOU Zhi-hui GAO Bo WANG Sheng-zhi CEN Ning 《Animal Husbandry and Feed Science》 CAS 2009年第6期16-18,共3页
[ Objective] To explore different preservation methods of recombinant E. coli and find out the optimal conditions for preservation. [ Method] The recombinant E. coli DH5cx transformed pcDNA.3 were respectively preserv... [ Objective] To explore different preservation methods of recombinant E. coli and find out the optimal conditions for preservation. [ Method] The recombinant E. coli DH5cx transformed pcDNA.3 were respectively preserved at 4℃ and -70 ℃, and the activity was determined after dif- ferent time. [ Result] The number of living E. coll with high dilutions preserved at 4 ℃ was gradually increased within the first 7 d, peaked on Day 7, and then gradually decreased. The number of living E. coli, which were preserved in 8% glycerol at -70℃ when OD800 at 0.8, were significantly higher than that of other groups after different preservation time. [ Conclusion] The optimal storage time was 7 d for recombinant E. coli at 4 ℃. For preservation at -70 ℃, the bacteria should be in logarithmic growth phase and preserved in 8% glycerol. 展开更多
关键词 Recombinant E. coli preservation methods Living bacteria
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VOLUME PRESERVING RK METHODS FOR LINEAR SYSTEMS
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作者 秦孟兆 李洪伟 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 2000年第4期430-434,共5页
In this article, we analyze and study under what conditions a source-free system has volumepreserving RK schemes. For linear systems, we give a comparatively thorough discussion about RK methods to be phase volume pr... In this article, we analyze and study under what conditions a source-free system has volumepreserving RK schemes. For linear systems, we give a comparatively thorough discussion about RK methods to be phase volume preserving integrators. We also analyze the relationship between volume-preserving integrators and symplectic integrators. 展开更多
关键词 Runge-Kutta method volume preserving method symplectic method
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A SIXTH ORDER AVERAGED VECTOR FIELD METHOD 被引量:2
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作者 Haochen Li Yushun Wang Mengzhao Qin 《Journal of Computational Mathematics》 SCIE CSCD 2016年第5期479-498,共20页
In this paper, based on the theory of rooted trees and B-series, we propose the concrete formulas of the substitution law for the trees of order = 5. With the help of the new substitution law, we derive a B-series int... In this paper, based on the theory of rooted trees and B-series, we propose the concrete formulas of the substitution law for the trees of order = 5. With the help of the new substitution law, we derive a B-series integrator extending the averaged vector field (AVF) methods for general Hamiltonian system to higher order. The new integrator turns out to be order of six and exactly preserves energy for Hamiltonian systems. Numerical exper- iments are presented to demonstrate the accuracy and the energy-preserving property of the sixth order AVF method. 展开更多
关键词 Hamiltonian systems B-SERIES Energy=preserving method Sixth order AVFmethod Substitution law.
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CALCULATION OF NAMBU MECHANICS
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作者 Shuang-hu Wang 《Journal of Computational Mathematics》 SCIE EI CSCD 2006年第3期444-450,共7页
In this paper, a fundamental fact that Nambu mechanics is source free was proved. Based on this property, and via the idea of prolongation, finite dimensional Nambu system was prolonged to difference jet bundle. Struc... In this paper, a fundamental fact that Nambu mechanics is source free was proved. Based on this property, and via the idea of prolongation, finite dimensional Nambu system was prolonged to difference jet bundle. Structure preserving numerical methods of Nambu equations were established. Numerical experiments were presented at last to demonstrate advantages of the structure preserving schemes. 展开更多
关键词 Nambu equations Differential forms Difference schemes Structure preserving methods.
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Derivation of a Non-Local Model for Diffusion Asymptotics--Application to Radiative Transfer Problems
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作者 C.Besse T.Goudon 《Communications in Computational Physics》 SCIE 2010年第10期1139-1182,共44页
In this paper,we introduce a moment closure which is intended to provide a macroscopic approximation of the evolution of a particle distribution function,solution of a kinetic equation.This closure is of non local typ... In this paper,we introduce a moment closure which is intended to provide a macroscopic approximation of the evolution of a particle distribution function,solution of a kinetic equation.This closure is of non local type in the sense that it involves convolution or pseudo-differential operators.We show it is consistent with the diffusion limit and we propose numerical approximations to treat the non local terms.We illustrate how this approach can be incorporated in complex models involving a coupling with hydrodynamic equations,by treating examples arising in radiative transfer.We pay a specific attention to the conservation of the total energy by the numerical scheme. 展开更多
关键词 Diffusion approximation nonlocal transport asymptotic preserving methods radiative hydrodynamics
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Implicit-Explicit Runge-Kutta Schemes for the Boltzmann-Poisson System for Semiconductors
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作者 Giacomo Dimarco Lorenzo Pareschi Vittorio Rispoli 《Communications in Computational Physics》 SCIE 2014年第5期1291-1319,共29页
In this paper we develop a class of Implicit-Explicit Runge-Kutta schemes for solving the multi-scale semiconductor Boltzmann equation.The relevant scale which characterizes this kind of problems is the diffusive scal... In this paper we develop a class of Implicit-Explicit Runge-Kutta schemes for solving the multi-scale semiconductor Boltzmann equation.The relevant scale which characterizes this kind of problems is the diffusive scaling.This means that,in the limit of zero mean free path,the system is governed by a drift-diffusion equation.Our aim is to develop a method which accurately works for the different regimes encountered in general semiconductor simulations:the kinetic,the intermediate and the diffusive one.Moreover,we want to overcome the restrictive time step conditions of standard time integration techniques when applied to the solution of this kind of phenomena without any deterioration in the accuracy.As a result,we obtain high order time and space discretization schemes which do not suffer from the usual parabolic stiffness in the diffusive limit.We show different numerical results which permit to appreciate the performances of the proposed schemes. 展开更多
关键词 IMEX-RK methods asymptotic preserving methods semiconductor Boltzmann equation drift-diffusion limit
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