检索结果-南通市图书馆

favorable and unfavorable amino acid residues in water-soluble and transmembrane proteins

在线全文

学校读者我要写书评

暂无评论

Journal of Biomedical Science and Engineering 2013年第1期6卷 36-44页

作者： Hiroshi Nakashima Ayano Yoshihara Kei-ichiro Kitamura Department of Clinical Laboratory Science Graduate Course of Medical Science and Technology School of Health Science Kanazawa University Kanazawa Japan

We analyzed the amino acid residues present in the water-soluble and transmembrane proteins of 6 thermophilic and 6 mesophilic species of the domains Archaea and Eubacteria, and characterized them as favorable or unfavorable. The characterization was performed by comparing the observed number of each amino acid residue to the expected number calculated from the percentage of nucleotides present in each gene. Amino acids that were more or less abundant than expected were considered as favorable or unfavorable, respectively. Comparisons of amino acid compositions indicated that the water-soluble proteins were rich in charged residues such as Glu, Asp, Lys, and His, whereas hydrophobic residues such as Trp, Phe, and Leu were abundant in transmembrane proteins. Interestingly, our results found that although the Trp residue was abundant in transmembrane proteins, it was not defined as favorable by our calculations, indicating that increased numbers of a particular amino acid does not necessary indicate it is a favorable residue. Amino acids with high G + C content such as Ala, Gly, and Pro were frequently observed as favorable in species with low G + C content. Comparatively, amino acids with low G + C content such as Phe, Tyr, Lys, Ile, and Met were frequently observed as favorable in species with high G + C content. These are the examples to increase the supply of amino acids than expected. Amino acids with neutral G + C content, i.e., Glu and Asp were favorable in water-soluble proteins from all species analyzed, and Cys was unfavorable both in water-soluble and transmembrane proteins. These results indicate that amino acid compositions are essentially determined by the nucleotide sequence of the genes, and the amino acid content is altered by a deviation from expectation.

关键词： Amino Acid Composition Nucleotide Composition favorable and Unfavorable Residues Water-Soluble and Transmembrane Proteins Thermophilic and Mesophilic Species

Aerodynamic Optimization of the Expansion Section in a Hypersonic Quiet Nozzle Based on favorable Pressure Effect

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 Applied Mathematics and Physics 2014年第6期2卷 443-448页

作者： Jian Gong Dapeng Yao Xunhua Liu China Academy of Aerospace Aerodynamics Beijing 100074 China

Maximum expansion angle is the primary parameter for the design of expansion section of hypersonic quiet nozzle. According to the quantity of maximum expansion angle, expansion section could be classified as fast expansion and slow expansion. In order to diminish the effect of instability of Görtler vortex, gradually, slow expansion was employed for quiet nozzle design. Based on the favorable pressure effect, the maximum expansion angle is optimized in this paper, and a considerable selective session of maximum expansion angle is obtained. The trend that slow expansion is employed instead of fast expansion is explained, and a new method is established for aerodynamic optimization of expansion section contour in a quiet nozzle.

关键词： Quiet Nozzle Maximum Expansion Angle favorable Pressure Effect

New delineation of two favorable zones for gas hydrate in southem Qinghai and northern Tibet,China

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

China Geology 2018年第2期1卷 304-305页

作者： Shuai Zhang Ping-kang Wang You-hai Zhu Rui Xiao Shou-ji Pang Oil and Gas Survey China Geological SurveyBeijing 100029China

*** Qinghai-northem Tibet permafrost region is a place having the most widespread and most developed permafrost in China with good mineralization conditions and prospecting potentials for gas hydrate (Zhu YH et al.,2011). In 2011,China Geological Survey initiated a special national program entitled "Gas hydrate resource exploration and trial mining",which signaled a prelude to a comprehensive gas hydrate survey in southern Qinghai-northern Tibet permafrost *** far,appreciable progress has been made in the geological,geophysical,geochemical and drilling survey across a number of key *** paper is intended to examine the fundamental conditions for gas hydrate mineralization based on previous findings,delineate favorable zones for gas hydrate mineralization,and to make contributions to the onshore gas hydrate resource exploration in China.

关键词： New delineation two favorable zones gas hydrate

Newly　Amended　Payment　of　Royalties　favorable　for　Sino－foreign　Cooperative　Exploitation　of　Petroleum　Resources　on　Land

在线全文

学校读者我要写书评

暂无评论

China Oil & Gas 1995年第4期2卷 52-52页

作者： $$$$

ＮｅｗｌｙＡｍｅｎｄｅｄＰａｙｍｅｎｔｏｆＲｏｙａｌｔｉｅｓＦａｖｏｒａｂｌｅｆｏｒＳｉｎｏ－ｆｏｒｅｉｇｎＣｏｏｐｅｒａｔｉｖｅＥｘｐｌｏｉｔａｔｉｏｎｏｆＰｅｔｒｏｌｅｕｍＲｅｓｏｕｒｃｅｓｏｎＬａｎｄＡｓＣｈｉ... 详细信息

ＮｅｗｌｙＡｍｅｎｄｅｄＰａｙｍｅｎｔｏｆＲｏｙａｌｔｉｅｓＦａｖｏｒａｂｌｅｆｏｒＳｉｎｏ－ｆｏｒｅｉｇｎＣｏｏｐｅｒａｔｉｖｅＥｘｐｌｏｉｔａｔｉｏｎｏｆＰｅｔｒｏｌｅｕｍＲｅｓｏｕｒｃｅｓｏｎＬａｎｄＡｓＣｈｉｎａ＇ｓｔｈｉｒｄｒｏｕｎｄｏｆｉ...

关键词： foreign Cooperative Sino favorable Payment Royalties Exploitation

Biomimetic Alveolus-on-a-Chip for SARS-CoV-2 Infection Recapitulation

在线全文

学校读者我要写书评

暂无评论

Research 2022年第2期2022卷 29-40页

作者： Ting Cao Changmin Shao Xiaoyu Yu Ruipei Xie Chen Yang Yulong Sun Shaohua Yang Wangjian He Ye Xu Qihui Fan Fangfu Ye Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)WenzhouZhejiang 325001China Rejing National Laboratory for Condensed Matter Plysics Institute of PhysicsChinese Academy of SciencesBijjing 100190China Wenzhou Institute Universily of Chinese Academy of SciencesWenzhouZhejiang 325001China School of Mechanical Engineering Automation Beihang UniversityBeijing00191China

SARS-CoV-2 has caused asevere pneumoniapandemic worldwide with high morbidity and *** developa preclinical model for recapitulating SARS-CoV-2 pathogenesis is stil urgent and essential for the control of the ***,we have established a 3D biomimetic alveolus-on-a-chip with mechanical strain and extracellular matrix taken into *** have validated that the alveolus-on-a-chip is capable of recapitulating key physiological characteristics of human alveolar units,which lays a fundamental basis for viral infection studies at the organ *** virus-analogous chemicals and pseudovirus,we have explored virus pathogenesis and blocking ability of antibodies during viral *** work provides a favorable platform for SARS-Cov-2-related researches and has a great potential for physiology and pathophysiology studies of the human lung at the organ level in vitro.

关键词： urgent favorable chemicals

Evaluation Methods of Profitable Tight Oil Reservoir of Lacustrine Coquina: A Case Study of Da'anzhai Member of Jurassic in the Sichuan Basin

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

Acta Geologica Sinica(English Edition) 2020年第2期94卷 418-429页

作者： PANG Zhenglian TAO Shizhen ZHANG Qin ZHANG Bin ZHANG Tianshu YANG Xiaoping WU Yinye FAN Jianwei YUAN Miao Research Institute of Petroleum Exploration&Development PetrochinaBeijing 100083China

Based on core observation,cast and fluorescent thin sections,FESEM and ESEM,coquina in Da'anzhai Member of Jurassic in Sichuan Basin were examined *** with production data and logging evaluation,a method for lacustrine coquina evaluation based on geological theory was established *** the article,two aspects of the study were elaborated,characteristics of favorable reservoirs,and a"five-step"evaluation method for favorable coquina *** to the correlation between porosity and production data,porosity is not effective in finding high quality coquina reservoir of this *** micro research of reservoir samples from a high productivity well revealed that sparry coquina is the best lithofacies,with the most developed micro storage space of various *** the favorable reservoir was sorted out,a five-step method evaluating the coquina reservoir was worked *** ofGR value and rock types suggests that GRfavorable reservoir zones,and 7 first class and 9 second class favorable zones of coquina were picked out.

关键词： coquina lithofacies logging evaluation favorable areas Sichuan Basin

STATISTICAL ANALYSIS OF THE MATERIAL SOURCE AND THE MODERN SEDIMENTARY ENVIRONMENT OF THE FERROMANGANESE NODULES ENRICHED AREA OF THE NORTH PACIFIC REGION

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 1990年第3期8卷 249-256页

作者：鲍根德杨谦宏 The Second Institute of Oceanography. SOA Hangzhou

The source of elements and the modem sedimentary environment of the ferromanganese nodules enriched area of the North Pacific region were analysed statistically and discussed in detail - Cluster analysis shows the area ’ s surface sediments are mainly brown clay and biogenic calcareous , calcsiliceous and siliceous ooze. Factor (principal component) analysis shows that the area’s trace elements (Fe . ***> *** > Zn , Cr . etc ) mainly come through adsorption of clay minerals and secondarily from authigenic sediments related to biochemical processes -

关键词： sedimentary enriched nodules modem minerals biochemical analysed carbonate brown favorable

A FISHERIES STUDY ON THE SECTIONAL CIRCULATION IN THE EAST CHINA SEA

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 1989年第3期7卷 196-210页

作者：郑建元 East China Sea Fisheries Research Institute Chinese Academy of Fisheries Science

Surveys since 1959 showed that the dynamic basis of the East China Sea sectional circulation is the nearshore seawater horizontal divergence caused by wind on the surface compensated by Kuroshio subsurface water convergence caused by meridional current in the lower *** always tend to migrate along certain routes or stay in certain areas favorable for development of eggs, survival of larvae and living of adults. The movement of water masses supplies a very important driving force for marine animals migrating long *** lower part of the sectional circulation formed by the subsurface water of Kuroshio is not suitable for the aggregation offish because of its lack of oxygen, and has therefore a driving influence on demersal *** study of the sectional circulation influence on the distributions of some commercially important species in the East China Sea reveals a close relationship between the circulation and the movement of fish *** principal factors influencing zonal

关键词： subsurface favorable sectional migrate compensated divergence commercially aggregation meridional dissolved

Experimental Study of the Physico-chemical Conditions of Skarn Formation

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 1985年第2期4卷 114-126页

作者：赵斌李通锦李昭平 Institute of Geochemistry Academia Sinica Institute of Geochemistry Academia Sinica

Experimental results show that skarns can--800℃ and 500--1,000 bars. Starting materialsinclude intermediate-acidic igneous rocks, volcanic rocks, metamorphic rocks, carbonates of va-rious purities and chemical reagents of analytical purity-grade. Experimental media are: NaCI,NaCl + CaCl;, NaCl + CaCl;+ MgCl;, Na;CO;and Na;SiO;solutions. Experimental results show that skarns can be formed under wide physico-chemical condi-tions: T=400°--800℃, P=500--1,000 bars, pH=4--11, and fo;=10;--10;bar. The mineralogyof skarns and the chemical compositions of skarn minerals are generally controlled by the com-bined factors: the chemical composition of the original rocks, pH values, redox conditions,temperatures and pressures. Isomotphous substitution may have agreat effect on the temperatu-re of formation and fo;of some major skarn minerals. It is found that skarnization occurs pre-ferentially in NaCl and NaCl+CaCl;solutions and subortinately in MaCO;and Na;SiO;soiu-tions.

关键词： metamorphic volcanic minerals garnet favorable substitution probably purity acidic limestone