检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

核酸内切酶在细胞凋亡中的作用

生物化学与生物物理进展 1997年第1期24卷 26-31页

作者：邓友平肖培根中国医学科学院中国协和医科大学药用植物研究所北京100094

核酸内切酶在形成细胞凋亡的典型特征———DNA片段化中 ,发挥着直接的重要作用 .介绍了已知的参与细胞凋亡的二价金属离子依赖性和非依赖性核酸内切酶种类 ,其中二价金属离子依赖性主要有nuc1 8、DNaseⅠ、Ca2 +/Mg2 +核酸内切酶、Ca2 ... 详细信息

核酸内切酶在形成细胞凋亡的典型特征———DNA片段化中 ,发挥着直接的重要作用 .介绍了已知的参与细胞凋亡的二价金属离子依赖性和非依赖性核酸内切酶种类 ,其中二价金属离子依赖性主要有nuc1 8、DNaseⅠ、Ca2 +/Mg2 +核酸内切酶、Ca2 +/Mn2 +核酸内切酶、DNaseγ、nuc58和nuc4 0 ;二价金属离子非依赖型主要有DNaseⅡ及类似核酸内切酶 .此外。

关键词：核酸内切酶细胞凋亡

Three dimensional diagnostic,semidiagnostic and prognostic calculations of current in the East China Sea in April of 1994

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2001年第1期20卷 15-28页

作者： Wang Huiqun 1,2 ,Yuan Yaochu 1,21 .KeyLaboratoryofOceanDynamicProcessesandSatelliteOceanography ,StateOceanicAdministration ,China　2 .SecondInstituteofOceanography ,StateOceanicAdministration ,POBox .12 0 7,Hangzhou 310 0 12 ,China Key Lab. Ocean Dynamic Processes S. State Oceanic Administration China Second Institute of Oceanography State Oceanic Administration Hangzhou 310012 PO Box. 1207 China

Three dimensional diagnostic,semidiagnostic and prognostic models in the σ coordinate are used to compute the current in the East China Sea with wind and hydrographic data obtained from the investigation of ocean fluxes in the East China Sea during the cruise of April *** computed results show that:the density and velocity fields and so on have been adjusted when time t ≈ 23 d, i.e.,the solution of semidiagnostic calculation has been *** quasi steady state solution also has been reached after about 60 *** the results of diagnostic calculation with those of semidiagnostic and prognostic calculations,it is found that they agree *** example,they all show that:(1)The Kuroshio flows along the shelf break of 200～1 000 m isobaths;(2)In the southeastern part of the computational region there is a stronger counter current with an anticyclonic eddy;(3)The volume transport through Section PN is about 30×10 6m 3/s and so *** there are some quantitative differences between *** example,(1)For the semidiagnostic results the Kuroshio current is stronger and clearer than that for diagnostic results and the Kuroshio width is more narrow than that for diagnostic *** shows that the semidiagnostic calculation can better reflect the topography effect;(2)In most computed region the vertical component of velocity intensifies for semidiagnostic result,especially on the shelf *** the results of semidiagnostic calculation with those of prognostic calculation,they agree qualitatively,and also agree quantitatively in the middle of computed region.

关键词： Circulation in the East China Sea diagnostic calculation semidiagnostic calculation prognostic calculation

在线全文

学校读者我要写书评

暂无评论

氨酰-tRNA合成酶对tRNA的识别

生物化学与生物物理进展 1997年第1期24卷 2-7页

作者：李勇李彤王恩多中国科学院上海生物化学研究所

氨酰 tRNA合成酶 (aaRS)与tRNA的相互作用保证了蛋白质生物合成的忠实性 .氨酰 tRNA合成酶对tRNA识别的专一性依赖于aaRS特定的催化结构域和tRNA分子特异的三级结构构象 .反密码子和接受茎 (包括 73位 )在大多数aaRS对tRNA分子的识别过... 详细信息

氨酰 tRNA合成酶 (aaRS)与tRNA的相互作用保证了蛋白质生物合成的忠实性 .氨酰 tRNA合成酶对tRNA识别的专一性依赖于aaRS特定的催化结构域和tRNA分子特异的三级结构构象 .反密码子和接受茎 (包括 73位 )在大多数aaRS对tRNA分子的识别过程中起着关键作用 ,其他部位如可变口袋、可变 (茎 )环等。

关键词：氨酰-tRNA 合成酶 tRNA 识别

新疆西南天山木扎尔特河一带低压泥质麻粒岩岩石学特征、独居石U-Th-Pb定年及其地质意义

在线全文

学校读者我要写书评

暂无评论

岩石学报 2009年第9期25卷 2271-2280页

作者：苟龙龙张立飞 G0U Peking Univ Key Lab Orogen Belts & Crustal Evolut Minist Educ Sch Earth & Space Sci Beijing 100871 Peoples R China

古南天山洋闭合过程中,由于洋壳俯冲产生的岛弧岩浆作用加热大陆地壳,在新疆西南天山木扎尔特一带形成了一套低压高温泥质麻粒岩相变质岩石。本文用Theriak-Domino热力学软件对该套岩石中的堇青石榴夕线石黑云母片麻岩和含夕线石堇青石... 详细信息

古南天山洋闭合过程中,由于洋壳俯冲产生的岛弧岩浆作用加热大陆地壳,在新疆西南天山木扎尔特一带形成了一套低压高温泥质麻粒岩相变质岩石。本文用Theriak-Domino热力学软件对该套岩石中的堇青石榴夕线石黑云母片麻岩和含夕线石堇青石榴黑云母片麻岩进行了岩石学相平衡计算研究,得到它们峰期变质的温压条件分别是:T=630～674℃,P=5.2～5.5kbar和T=645～684℃,P=5.4～5.7kbar。并采用独居石Th-U-Pb电子探针定年方法,对样品WQ006中的3颗独居石进行了原位年龄测定(38个分析点),得到2组等时线年龄,分别是376±8Ma和280±8Ma(2σ)。结合独居石的岩相学特征,提出了新疆西南天山低压高温麻粒岩相峰期变质作用的时代为280±8Ma,而376±8Ma(2σ)可能为原沉积岩的原岩/成岩年龄。表明西南天山洋壳开始俯冲发生在晚古生代,进一步证明了西南天山造山带俯冲碰撞发生在晚二叠纪之后的观点。

关键词：新疆西南天山木扎尔特低压泥质麻粒岩相岩石学特征独居石定年地质意义 southwestern Tianshan region monazite dating China South Tianshan 黑云母片麻岩 electron microprobe 南天山洋峰期变质 phase equilibria

ILLUMINATION AND EXPOSITION OF A CONVEX n-DIMENSIONAL BODY DEPENDING ON ITS SHARPNESS

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2002年第2期22卷 189-198页

作者： Boris V. Dekster Mathematics, Mount Allison University, Sackville, N.B. EOA 3C0, Canada Mt Allison Univ Sackville NB E0A 3C0 Canada

A convex n-body C is said to be exposable to a set D of a few directions if there is a linear transformation L : En → En such that L(C) arid each body isometric to L(C) is illuminated by D. Denote by En the minimum integer such that each C is exposable to a (fixed) set D of cardinality En. An upper bound for En is established here.

关键词： Covering illumination Hadwiger conjecture

Convective heat transfer

在线全文

学校读者我要写书评

暂无评论

Convective heat transfer

The Study of Excitation of the Earthquake to Earth's Rotation

2002年

作者： Cebeci Tuncer. CAL n2005038899# ba0yba0y

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

天文研究与技术 1999年第S1期 481-484页

作者： GuZhennian (ShanghaiAstronomicalObservatory ,TheChineseAcademyofSciences,Shanghai 2 0 0 0 30 ,China)

Usingthefaultplaneparameters,thelocationofepicenterandtheexpressiongivenby Dahlenaswellasthestepfuction ,theaccumulativechangeoftheaxialandequatorialmomentof inertiaoftheearthfor 1 977～ 1 994dataisestimatedinthispaper .Resultshaveshownthat changeofpolemotiondirectioninducedbysingleearthquakeisindependentofthesizeofearth quake .Theearthquaketendstomaketherotationalpoledrifttowardsthedirectionof 1 2 5～ 1 5 0 E .T*** changesofthetwoequatorialprincipalmomentsandaxialmomentofinertiaoftheearthexhibit *** ment.

关键词： earthrotation earthquake excitation .

Genetic Variants in EGFR/PLCE1 Pathway Are Associated with Prognosis of Esophageal Squamous Cell Carcinoma after Radical Resection

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2019年第3期39卷 385-390页

作者： Yu-li WANG Ye YUAN Xiao-xiao LUO Guang-yuan HU Ping G0NG Department of Oncology the First Affiliated Hospital of the Medical College Shihezi University Shihezi 832008China Department of Clinical Medicine School of Medicine Shihezi University Shihezi 832008China Department of Oncology Tongji HospitalTongji Medical College Huazhong University of Science and TechnologyWuhan 430030 China

Esophageal cancer (EC) is one of the most deadly malignant diseases. Several studies revealed that variations of the phospholipase C epsilon 1 (PLCE1) gene were associated with EC susceptibility. PLCE1 is located downstream of the epidermal growth factor receptor (EGFR) pathway. Presently, the single nucleotide polymorphisms (SNPs) of EGFR/PLCE1 genes and their associations with EC survival remain unclea匚 In this study, the associations between genetic variants in the EGFR/PLCE1 pathway and prognosis in 124 esophageal squamous cell carcinoma (ESCC) patients with radical resection were explored. The results showed that CC genotype of both PLCE1 rsl7109671 and EGFR rs2072454 was associated with ESCC prognosis. Multivariate analysis revealed that patients with the two unfavorable genotypes had the worst overall survival (OS) or disease-free survival (DFS)(HR=6.099, 95%CI=1.903-19.552;HR=3.994, 95%CI=1.49-10.702, respectively). Additionally, combination of SNPs and tumor stage could better predict OS (for AUC, 0.774 vs. 0.709) and PFS (for AUC, 0.773 vs. 0.704) than tumor stage *** conclusion, genetic variants of the EGFR/PLCE1 may be predictors of the prognosis of ESCC after surgery. The individuals with the CC genotype of PLCE1 rsl7109671 and EGFR rs2072454 should receive more aggressive treatments.

关键词： esophageal squamous cell carcinoma prognosis single nucleotide polymorphism survival epidermal growth factor receptor

Some Aspects of Ecology of Chrysichthys nigrodigitatus (Lacepede) in River Niger, Nigeria

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Northeast Agricultural University(English Edition) 2016年第3期23卷 47-53页

作者： Nwachi 0 F Department of Fisheries and Aquaculture Faculty of Agriculture Delta State University Abraka Asaba Campus Nigeria Department of Aquaculture and Marine Biotechnology Universiti Putra Malaysia

A study on the food and feeding habit of Chrysichthys nigrodigitatus （Lacepede） was conducted in River Niger within the region of Oshimili local government area of Delta State Nigeria. A total of 90 specimens were collected with the help of fishermen using gill net, cast net and traps. The fish samples were immediately taken to the laboratory for analysis. Morphometric characteristics such as weight, length, condition factor, egg weight, Gonado Somatic Index （GSI） and sex ratio were determined. The stomach content was analyzed using numerical method to determine the food content. The total length of the fish sampled ranged from 14.40-44.60 cm, while the standard length varied from 11.00 cm to 47.00 cm and the fish body weight ranged between 19.00 g to 503.20 g. Sex ratio 1 female to 1 male was observed. The mean condition factor for both male and female obtained was 1.67. Of all the 90 fishes sampled, none had empty gut representing 100%. The major food items were phytoplankton, plant part and Detritus. Out of 41 females sampled, only 17 had eggs and the eggs were matured at stage IV.

关键词： morphometric numerical method phytoplankton sampling and condition factor