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Analytic perturbation solutions to the Venusian orbiter due to the nonspherical gravitational potential

Science China Mathematics 2000年第5期43卷 552-560页

作者：刘林 C.K.Shum Department of Astronomy Nanjing University Nanjing 210093 China The Texas University at Austin Center for Space Research

The analytic perturbation solutions to the motions of a planetary orbiter given in this paper are effective for 0e1, where e is the orbital eccentricity of the orbiter. In the solution, it is assumed that the rotation of the central body is slow, and its astronomical background is clear. Examples for such planets in the solar system are Venus and Mercury. The perturbation solution is tested numerically on two Venusian orbiters with eccentric orbits, PVO and Magellan, and found to be effective.

关键词： slow rotation central body Venusian orbiter nonspherical gravitational potential analytic per- turbation solutions.

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Synergistic effects of cellobiose dehydrogenase and manganese-dependent peroxidases during lignin degradation

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Chinese Science Bulletin 2001年第23期46卷 1956-1962页

作者： HUANG Feng FANG Jing LU Xuemei GAO Peiji CHEN Jiaxiang State Key Laboratory of Microbial Technology Shandong UniversityJinan 250100China State Key Lab of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510641China

The synergistic effects of cellobiose dehydro-genase (CDH) and manganese-dependent peroxidases (MnP) on the degradation of kraft pulp cellulolytic enzyme lignin (CEL) were investigated. Addition of CDH significantly increased the amount of water-soluble products reduced from CEL by MnP. CDH facilitated the reduction of the contents of methoxyl, carboxyl, phenolic hydroxyl and total hydroxyl groups of CEL by MnP. 1H-NMR analysis showed that addition of CDH also decreased further the amount of protons of CEL degraded by MnP. The results proved for the first time that CDH could promote degradation of lignin by MnP and suggest that CDH could not only promote degradation of cellulose but also is an important part of the lignin biodeg-radation system.

关键词： cellobiose dehydrogenase manganese-dependent per- oxidase lignin degradation.

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