Chinese researchers contributes to complete Bivalvia Treatise

A research team from Nanging Institute of Geology and Paleontology, Chinese Academy of Sciences, recently published their research ＂Supraspecific Taxa of the Bivalvia first named, described, and published in China＂ （1927--2007） in the University of Kansas Paleontological Contributions New Series 17.     

Editor''''s note

Robert (Bob) J. Stern is a Professor of Geosciences at the University of Texas at Dallas. He received a BSc in Geology with honors from the University of California at Davis in 1974, and a PhD in Earth Sciences from the University of California at San Diego (Scripps Institution of Oceanography) in 1979. He held a postdoctoral fellowship in the Department of Terrestrial Magnetism at the Carnegie Institution of Washington     

Science in China Series D:Earth Sciences

EDITOR-IN-CHIEF SUN Shu Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029, China AIMS AND SCOPE Science in China Series D: Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science in China Press and Springer, is committed to publishing high-quality, original results in both basic and applied research.     

SPECIAL TOPICS:Editor's note

Euan Nisbet is Foundation Professor of Geology in the Department of Earth Sciences at Royal Holloway, University of London, UK.He studied first at the University     

Graptolite fauna indicates the beginning of the Kwangsian Orogeny

A research at the State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,has shown,based on a refined division and correlation of the graptolite-bearing strata in southern Jiangxi,China,that the Kwangsian Orogeny commenced in the early Katian Age of the Late Ordovician. Because of its significant research value,this study is published in Volume 53,Issue 11 of SCIENCE CHINA Earth Sciences.     

Science in China Series D:Earth Sciences

EDITOR SUN Shu Institute of Geology and Geophysics Chinese Academy of Sciences Beijing100029,China AIMS AND SCOPE Science in China Series D:Earth Sciences,an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science …     

Science in China Series D: Earth Sciences

EDITOR-IN-CHIEF SUN Shu Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029, China AIMS AND SCOPE Science in China Series D: Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the Nationa     

Science in China Series D:Earth Sciences

EDITOR SUN Shu Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029, China AIMS AND SCOPE Science in China Series D: Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National     

Science in China Series D:Earth Sciences

EDITOR SUN Shu Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029, China AIMS AND SCOPE Science in China Series D: Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Scie…     

Editor＇s Note

P. R. Castillo is a Professor of Geology at Scripps Institution of Oceanography （SIO）, University of California at San Diego. He received a BSc from University of the Philippines in 1977, an MSc from University of Akron （USA） in 1983, and a PhD from Washington University （USA） in 1987. He held positions at Carnegie Institution of Washington and University of Miami before he joined SIO in 1990.     

冠状病毒主蛋白酶及其化学抑制剂研究进展

一个新的冠状病毒已经被鉴定为急性呼吸道综合症(SARS)的病原体,控制该病毒复制复合体活性的主蛋白酶(Mpro或3CLpro)将很可能成为开发针对SARS特效治疗药物的靶位点.综述了人冠状病毒株229E(HCoV 229E)和一种在猪体内引发传染性胃肠炎的病毒(TGEV)的Mpro的晶体结构以及以此为基础构建的SARS冠状病毒(SARS-CoV)同源蛋白酶的空间结构模型.通过对这些同源蛋白酶的结构及其与已知的蛋白酶化学抑制剂的结合特征进行分析后发现Mpro的底物结合位点具有惊人的保守性,这种保守性也被重组SARS-CoV Mpro能介导的TGEV Mpro的底物剪切实验所进一步证实.分子模型表明已有的鼻病毒3Cpro抑制剂经过改进后或许能用于SARS的治疗.     

蒙古族的蒙古褶,上眼睑褶皱的分析研究

作者于1985年1月至5月调查了内蒙古自治区蒙古族人649例(男315例,女334例)蒙古褶,上眼睑褶皱。调查为随机取样,被调查者年龄在9—25岁之间。蒙古族人蒙古褶平均级(x±S.D.)为1.94±0.883,出现率为93.91％与我国其它民族相比,蒙古族人的蒙古褶出现率较高。蒙古族人上眼睑褶皱平均级为(x±S.D)1.21±1.032,出现率为71.10％,与我国其它民族相比,蒙古族人上眼睑褶皱平均级与出现率均较低。     

血液透析膜的应用及其改性研究进展

 急慢性肾功能衰竭是致命重症.临床治疗上述疾病的方法只有两种：血液透析或换肾.目前血液透析是治疗广大急慢性肾功能衰竭患者的主要手段.在血液透析设备中,透析膜至关重要.近年来,血液透析对其用膜的要求不断提高.本文综述了透析用膜的种类及其制备工艺、改性原理及方法,详细介绍了纤维素(cellulose)、醋酸纤维素(cellulose acetate,CA)、壳聚糖(chitosan,CS)、聚砜(polysulfone,PS)、聚醚砜(poly(ether sulfone),PES)、聚丙烯腈(polyacrylonitrile)、乙烯-乙烯醇共聚物(ethylene-vinyl alcohol copolymer, EVOH)、聚甲基丙烯酸酯(poly(methyl methacrylate),PMMA)、聚乙烯醇(Poly(vinyl alcohol),PVA)等血液透析膜的优缺点.针对血液透析对其用膜要求的不断提高,提出了针对血液透析膜改性处理,提升其生物相容性、改善其透析性能及开发新型透性膜的一些措施,对新型血液透析膜的研究和开发有一定的参考价值.     

剩余活性污泥胞外聚合物对水中Cd2+和Zn2+的吸附效能

以占剩余活性污泥质量80%的胞外聚合物(extracelluar polymeric substances,EPS)作为新型吸附剂,考察了pH、EPS投加量和吸附时间对其在水中吸附Cd2 与Zn2 的性能的影响,以达到剩余活性污泥的资源化利用.结果表明:Cd2 和Zn2 的最佳吸附条件为:pH=6,EPS的最佳投加量分别为375mg/L和250 mg/L,Cd2 和Zn2 的吸附率分别达到36%和51%.EPS对Cd2 和Zn2 的吸附过程均可分为两个阶段,分别在90 min和60 min时达到吸附平衡.离子共存实验发现,EPS对Cd2 的选择吸附性强于Zn2 ;Freundlich和Langmuir方程均可描述EPS在常温下吸附Cd2 的热力学过程;而Zn2 的吸附等温线与Langmuir方程拟合更好.拟合系数显示,EPS对Zn2 的吸附稳定性、吸附能力和亲和力均比对Cd2 的吸附强.表明剩余活性污泥EPS作为吸附剂前景广阔,具有更深的研究价值.     

一维波动方程Dirichlet问题的唯一性

本文给出波动方程u_(tt)-U_(xx)=0在矩形区域上的Dirichlet问题唯一性的新证明。并且证明了一维双曲方程au_(tt)+2bu_(xt)+cu_(xx)=0(b~2>ac)在矩形区域上的Dirichlet问题唯一的一个充分条件。     

广义逆A_(T,S)~((2))的表示、行列式公式及其应用

本文给出了任一复矩阵 A 的广义逆 A_(T,S)~(2)的多种表示及其分量的多种行列式公式,从而得到许多重要的广义逆 A~+,A_(MN)~+,A~(d),A~#,A_(L)~(-1),A_(L)~(+)的多种表示和行列式公式,特别是 A_(MN)~+和 A~(d)的两个更简单的表示式。     

四边形4变量联系的核素稳定区边界

在参量S=2Z-N,H=N-Z核素图中的Z43~50与K15~20四边形区,以4量SKRHX之三或四联系稳定区边界线,再延伸到四边形附近区域,导出的稳定区边界新折线可以显示出核素区边界间的深层联系.具体是,以4量联系,核素3240Cd164类联系偶Z36~24上界;坐标3105Rh105类联系至Z60~82上界;核素3241Ag183类联系偶Z80~52下界.以3量联系,核素3126Cd106类联系下界坐标S轴;坐标3250Sn155类导出偶Z40~24下界;3129Rh163类导出偶Z42~50界,使得稳定区的各局部边界折线联系在一起.这里新坐标系不是直角系,能发现核素系统分布的新联系与规律.     

火焰原子吸收分光光度法测定三聚磷酸钠中钙镁含量

在硝酸介质中，利用LaCl     

Parallel computing of Ocean General Circulation Model

This paper discusses the parallel computing of the third generation Ocean General Circulation Model (OGCM) from the State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics (LASG), Institute of Atmosphere Physics (IAP). Meanwhile, several optimization strategies for parallel computing of OGCM (POGCM) on Scalable Shared Memory Multiprocessor (S2MP) are presented. Using Message Passing Interface (MPI), we obtain super linear speedup on SGI Origin 2000 for parallel OGCM (POGCM) after optimization.     

细菌对铅和铬在多孔介质中迁移行为的影响

选用石英砂和载铁石英砂两种介质模拟环境介质, 以大肠杆菌C3000 为代表细菌, 考察细菌对Pb(Ⅱ) 和Cr(Ⅵ)迁移行为的影响。研究发现, Pb(Ⅱ)和Cr(Ⅵ)在载铁石英砂中迁移的阻滞系数(分别为4.793 和 1.212)分别大于在石英砂中的阻滞系数(1.145 和0.427), 表明Pb(Ⅱ)和Cr(Ⅵ)在载铁石英砂中的迁移能力低于其在石英砂中的迁移。在石英砂中, Pb(Ⅱ)和Cr(Ⅵ)在无细菌时迁移的阻滞系数(分别为1.145 和0.427)与有细菌时迁移的阻滞系数(1.230 和0.369)相近, 表明Pb(Ⅱ)和Cr(Ⅵ)的迁移不受共存细菌的影响。在载铁石英砂中, Pb(Ⅱ)在有细菌时迁移的阻滞系数(6.360)明显大于其在无细菌时的阻滞系数(4.793), 而Cr(Ⅵ)在有细菌时迁移的阻滞系数(1.212)与其在无细菌时的阻滞系数(1.037)相近, 表明细菌的存在会抑制Pb(Ⅱ)的迁移, 而对Cr(Ⅵ)的迁移不产生影响。研究结果可为预测重金属在土壤地下水中的迁移行为提供理论依据。