检索结果-南通市图书馆

Characterization of Mediterranean Magnetotactic Bacteria

Journal of Ocean University of China 2007年第4期6卷 355-359页

作者： Lefevre Christopher Bemadac Alain Pradel Nathalie WU Longfei Yu-Zhang Kui XIAO Tian yonnet jean-paul Lebouc Afef SONG Tao Fukumori Yoshihiro Laboratoire de Chimie Bactkrienne UPR 9043 CNRS Marseille France Service de Microscopic Electronique lnstitut de Biologic Structurale et Microbiologie CNRS Marseille France Laboratoire de Microscopies et d＇Etude de Nanostructures （LMEN） Universite de Reims Champagne-Ardenne 51687 Reims cedex 2 France Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 P. R. China Laboratoire d＇Electrotechnique de Grenoble Institut National Polytechniques de Grenoble F-38402 Saint Martin d＇eres Cedex France Institute of Electrical Engineering Chinese Academy of Science Beijing 100080 P. R. China Department of Life Science Graduate School of Nataral Science and Technology Kanazawa University Kanazawa Japan

Magnetotactic bacteria are a diverse group of motile prokaryotes that are ubiquitous in aquatic habitats and cosmopolitan in distribution. In this study, we collected magnetotactic bacteria from the Mediterranean Sea. A remarkable diversity of morphotypes was observed, including multicellular types that seemed to differ from those previously found in North and South America. Another interesting organism was one with magnetosomes arranged in a six-stranded bundle which occupied one third of the cell width. The magnetosome bundle was evident even under optic microscopy. These cells were connected together and swam as a linear entire unit. Magnetosomes did not always align up to form a straight linear chain. A chain composed of rectangle magnetosomes bent at a posi- tion with an oval crystal. High resolution transmission electron microscopy analysis of the crystal at the pivotal position suggested uncompleted formation of the crystal. This is the first report of Mediterranean magnetotactic bacteria, which should be useful for studies of biogeochemical cycling and geohistory of the Mediterranean Sea.

关键词： Magnetotactic bacteria Mediterranean Sea geomagnetism biogeochemical cycling ecology magnetosome crystals

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

On the Contribution of Wu Wen-Tsün to Algebraic Topology

引用

Journal of Systems Science & Complexity 2019年第1期32卷 3-36页

作者： BRASSELET jean-paul I2M (CNRS)-Aix-Marseille University

The aim of this article is to present the contribution of Wu Wen-Tsün to Algebraic Topology and more precisely to the theory of characteristic classes. Several papers provide complete and welldocumented biography and academic career of Wu Wen-Tsün, in particular, Hudecek, 2014; O'Connor and Robertson, 2006; Wen-Tsün Wu's Academic Career, 2006; Selected works of Wen-Tsun Wu, *** author does not repeat the details provided in these papers concerning the Wu Wen-Tsün's bibliography, we will just mention people involved in the Wu Wen-Tsün's period in *** addition to Wu Wen-Tsün's papers, the Dieudonné's book(Dieudonné, 1960) provides an excellent presentation of main results of Wu Wen-Tsün in Algebraic and Differential Topology. The author will use and abuse of this book(and refer to) when *** the introduction, the author recalls mainly historical facts concerning the contribution of Wu Wen-Tsün to Algebraic Topology. The second section shows speci?cally the contribution of Wu WenTsün to the Stiefel-Whitney classes and introduces the third section, dealing with the(real) Wu *** author provides de?nition, properties as well as further developments and generalizations of the Wu classes. The fourth and ?fth sections are devoted to recent applications: In Cobordism theory and in Mathematical Physics. The author notices that Wu classes have been used as well in other domains,in particular surgery theory(Madsen and Milgram, 1979). The last section concerns the complex Wu classes and shows that the more recent Mather classes coincide with the previously de?ned complex Wu classes, that is a result from Zhou(1994)(see also Liu, 1996).This article is devoted to the contribution of Wu Wen-Tsün to the theory of Characteristic Classes,which coincides with his "French period"(1947–1951). However, speaking of Algebraic Topology, it is worthwhile to mention the important contribution of Wu Wen-Tsün to the Theory of realization of complexes or manifolds in Eucl

关键词： Algebraic topology characteristic class cobordism theory mathematical physics Wu Class

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A High Dynamic Range GMI Current Sensor

引用

Journal of Sensor Technology 2012年第4期2卷 165-171页

作者： Aktham Asfour jean-paul yonnet Manel Zidi Laboratoire de Génie Electrique de Grenoble (G2E-Lab) Institut Polytechnique de Grenoble ENSE3 Saint Martin d’Hères France

The design and performances of a high dynamic range DC-AC current sensor utilizing Giant Magneto-Impedance (GMI) are presented. The sensor is based on a GMI element with negative feedback. The sensing element is a 30 μm diameter GMI Co-based amorphous wire. It is curled to a toroidal core of 2 cm diameter. A bias magnetic field of about 650 A/m is applied to the GMI element to obtain an asymmetric GMI effect. A strong negative feedback is introduced to ensure linearity in a wide dynamic range. Analog conditioning electronics was fully developed. This includes a square wave oscillator based on an inverter trigger;a peak detector and a high gain amplifier with zero adjust. The GMI element is driven at a 3 MHz frequency and 5 mA peak-to-peak current. The closed-loop operations are investigated and the performances of the sensor are presented. DC current measurements are performed. The sensor exhibits good sensitivity and very good linearity, free from hysteresis, in a wide dynamic range of ±40 A. The sensitivity is about 0.24 V/A and the linearity error is about 0.02% of the full scale (FS). The hysteresis error is smaller than the measurement accuracy. AC current measurements using the developed sensor have also been successfully achieved. The sensor bandwidth in closed-loop was about 1.7 kHz.

关键词： GMI Current Sensor Negative Feedback DC-AC Current Measurements

来源：

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

Analytical Calculation of the Energy in a Permanent Magnet

引用

Journal of Modern Physics 2016年第16期7卷 2281-2287页

作者： jean-paul yonnet Christian Chillet Hicham Allag Lotfi Chouikhi Laboratoire de Génie Electrique de Grenoble G2E Lab Université Grenoble Alpes Grenoble France Laboratoire de Génie Electrique de Grenoble G2E Lab CNRS Grenoble France Laboratoire d’Electronique et d’Electrotechnique Industrielle Jijel University Jijel Algeria

The energy in permanent magnet is not a trivial problem because it exist two types of energy: the field energy and the demagnetizing energy. For parallelepiped shape, the magnet energy has been calculated by fully analytical expressions in 3D. The result has been obtained after four successive integrations of Arctangent and Logarithm functions. The analytically calculated energy corresponds to the demagnetization energy in the magnet. The analytical results have been compared with different terms of energy obtained by computation.

关键词： Analytical Calculation Energy Permanent Magnet

来源：

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

Microbiota-host interplay at the gut epithelial level,health and nutrition

引用

Journal of Animal Science and Biotechnology 2017年第2期8卷 327-334页

作者： jean-paul Lallès Division of Human Nutrition Division INRA Clermont-Ferrand France Human Nutrition Research Center-West Nantes France

Growing evidence suggests the implication of the gut microbiota in various facets of health and disease. In this review, the focus is put on microbiota-host molecular cross-talk at the gut epithelial level with special emphasis on two defense systems： intestinal alkaline phosphatase（IAP） and inducible heat shock proteins（iHSPs）. Both IAP and iHSPs are induced by various microbial structural components（e.g. lipopolysaccharide, flagellin, CpG DNA motifs）,metabolites（e.g. n-butyrate） or secreted signal molecules（e.g., toxins, various peptides, polyphosphate）. IAP is produced in the small intestine and secreted into the lumen and in the interior milieu. It detoxifies microbial components by dephosphorylation and, therefore, down-regulates microbe-induced inflammation mainly by inhibiting NF-κB pro-inflammatory pathway in enterocytes. IAP gene expression and enzyme activity are influenced by the gut microbiota. Conversely, IAP controls gut microbiota composition both directly, and indirectly though the detoxification of pro-inflammatory free luminal adenosine triphosphate and inflammation inhibition. Inducible HSPs are expressed by gut epithelial cells in proportion to the microbial load along the gastro-intestinal tract. They are also induced by various microbial components, metabolites and secreted molecules. Whether iHSPs contribute to shape the gut microbiota is presently unknown. Both systems display strong anti-inflammatory and anti-oxidant properties that are protective to the gut and the host. Importantly, epithelial gene expressions and protein concentrations of IAP and iHSPs can be stimulated by probiotics, prebiotics and a large variety of dietary components, including macronutrients（protein and amino acids, especially L-glutamine, fat, fiber）, and specific minerals（e.g. calcium）and vitamins（e.g. vitamins K1 and K2）. Some food components（e.g. lectins, soybean proteins, various polyphenols） may inhibit or disturb these systems. The general cel ular and molecula

关键词： Diet Gut Inducible heat shock protein Inflammation Intestinal alkaline phosphatase Microbiota

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Single-particle cryo-EM: beyond the resolution

引用

National Science Review 2019年第5期6卷 864-866页

作者： jean-paul Armache Yifan Cheng Department of Biochemistry and Molecular Biology and the Huck Institutes of the Life Sciences Pennsylvania State University Howard Hughes Medical Institute University of California San Francisco Department of Biochemistry and Biophysics University of California San Francisco

Structural biology aims to provide structural insights into our understandings of biological processes at the atomic *** structures of biological macromolecules are often determinedby one of the three major methods:Xr... 详细信息

关键词： Single-particle cryo-EM beyond the resolution

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

G~n filling orbicular N-sided holes using periodic B-spline surfaces

引用

Science China(Information Sciences) 2011年第7期54卷 1383-1394页

作者： paul jean-Claude School of Software Tsinghua University Key Laboratory for Information System Security Ministry of Education of China Tsinghua National Laboratory for Information Science and Technology Institute National de Recherche en Informatique et en Automatique

The orbicular N -sided hole filling problem is usually introduced by filleting an end-point of a part with large *** existing methods based on quadrilateral partition or constrained-optimization can rarely generate high-order continuous blending surfaces under these *** paper first reparameterizes the boundary of the specified orbicular N -sided hole to ensure the compatibility of neighboring cross-boundary derivatives on the connecting points,preserving their G n *** we compute the control points of the periodic B-spline surface using the sufficient G n continuity condition on the pole and the algorithm of extending parametric *** method generates single blending surface,which can be converted into standard Bspline surface by adding knots without introducing *** only elevates the degree of the boundary by *** construction method is simple and efficient,without iteration nor large-scale matrix *** achieves G n continuity under compatible *** blending examples underline its feasibility and practicability.

关键词： CAD periodic B-spline surface polar coordinates N -sided hole filling G n continuity

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Subdifferentials of Distance Functions,Approximations and Enlargements

引用

Acta Mathematica Sinica,English Series 2007年第3期23卷 507-520页

作者： jean-paul PENOT Robert RATSIMAHALO Department of Mathematics Faculty of Sciencesav.de l'Université BP 115564013 PA U CédexFrance Business Unit:Bank and Financials SODIFRANCE104 rue Castagnary75015 ParisFrance

In this work, we study some subdifferentials of the distance function to a nonempty nonconvex closed subset of a general Banach space. We relate them to the normal cone of the enlargements of the set which can be cons... 详细信息

关键词： Distance function Normal cone Regularization Subdifferential

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Genome Editing with CRISPR-Cas9:Can It Get Any Better?

引用

Journal of Genetics and Genomics 2016年第5期43卷 239-250页

作者： Maximilian Haeussler jean-paul Concordet Santa Cruz Genomics Institute MS CBSE1156 High StreetUniversity of California Laboratoire Structure et Instabilite des Genomes Inserm U1154CNRS UMR7196Museum national d'Histoire naturelle

The CRISPR-Cas revolution is taking place in virtually all fields of life *** DNA cleavage with the CRISPR-Cas9 system of Streptococcus pyogenes has proven to be extraordinarily simple and efficient,relying only on the design of a synthetic single guide RNA（sgRNA） and its co-expression with ***,we review the progress in the design of sgRNA from the original dual RNA guide for *** and Staphylococcus aureus Cas9（SpCas9 and SaCas9）.New assays for genome-wide identification of offtargets have provided important insights into the issue of cleavage specificity in *** the same time,the on-target activity of thousands of guides has been *** data have led to numerous online tools that facilitate the selection of guide RNAs in target *** appears that for most basic research applications,cleavage activity can be maximized and off-targets minimized by carefully choosing guide RNAs based on computational ***,recent studies of Cas proteins have further improved the flexibility and precision of the CRISPR-Cas toolkit for genome *** by the crystal structure of the complex of sgRNA-SpCas9 bound to target DNA,several variants of SpCas9 have recently been engineered,either with novel protospacer adjacent motifs（PAMs） or with drastically reduced *** Cas9 and Cas9-like proteins called Cpf 1 have also been characterized from other bacteria and will benefit from die insights obtained from *** editing with CRISPR-Cas9 may also progress with better understanding and control of cellular DNA repair pathways activated after Cas9-induced DNA cleavage.

关键词： Genome editing CRISPR-Cas9 system Guide RNA

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of stocking density on performances of juvenile turbot (Scophthalmus maximus) in recirculating aquaculture systems

引用

Chinese Journal of Oceanology and Limnology 2013年第3期31卷 514-522页

作者：李贤刘鹰 jean-paul BLANCHETON Key Laboratory of Marine Biotechnology Institute of OceanologyChinese Academy of Sciences Graduate University of Chinese Academy of Sciences IFREMER UMR Ecosym USTL

Limited information has been available about the influence of loading density on the performances of Scophthalmus maximus, especially in recirculating aquaculture systems （RAS）. In this study, turbot （13.84±2.74 g; average weigh±SD） were reared at four different initial densities （low 0.66, medium 1.26, sub-high 2.56, high 4.00 kg/m^2） for 10 weeks in RAS at 23±1℃ Final densities were 4.67, 7.25, 14.16, and 17.47 kg/m^2, respectively, which translate to 82, 108, 214, and 282 percent coverage of the tank bottom. Density had both negative and independent impacts on growth. The final mean weight, specific growth rate （SGR）, and voluntary feed intake significantly decreased and the coefficient of variation （CV） of final body weight increased with increase in stocking density. The medium and sub-high density groups did not differ significantly in SGR, mean weight, CV, food conversion rate （FCR）, feed intake, blood parameters, and digestive enzymes. The protease activities of the digestive tract at pH 7, 8.5, 9, and 10 were significantly higher for the highest density group, but tended to be lower （not significantly） at pH 4 and 8.5 for the lowest density group. The intensity of protease activity was inversely related to feed intake at the different densities. Catalase activity was higher （but not significantly） at the highest density, perhaps because high density started to induce an oxidative effect in turbot. In conclusion, turbot can be cultured in RAS at a density of less than 17.47 kg/m^2. With good water quality and no feed limitation, initial density between 1.26 and 2.56 kg/m^2 （final： 7.25 and 14.16 kg/m^2） would not negatively affect the turbot cultured in RAS. For culture at higher density, multi-level feeding devices are suggested to ease feeding competition.

关键词： turbot stocking density growth protease activity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：