检索结果-南通市图书馆

Life-history macroevolution in lizards:what can an unknown Phrynocephalus lizard tell us?

在线全文

cnki会议

学校读者我要写书评

暂无评论

Life-history macroevolution in lizards:what can an unknown P...

野生动物生态与资源保护第三届全国学术研讨会

作者： LI Xiang~(1,2) QU Yanfu~1 SUN Yanyan~2 (1 Jiangsu Key Laboratory for Biodiversity and Biotechnology,college of Life sciences,Nanjing Normal university,Nanjing 210097,Jiangsu,china 2 Hangzhou Key Laboratory for Animal sciences and Technology,Hangzhou Normal college,Hangzhou 310036,Zhejiang,china)

＜正＞We found an unknown toad-headed lizard in 2004,when studying space use and thermal requirements of Phrynocephalus vlangalii in *** two lizards differ in use of *** that unknown toad-headed lizards are more likel...

关键词：

在线全文

cnki会议

学校读者我要写书评

暂无评论

绿洲旅游文化景观资源场域生成机制探析

干旱区资源与环境 2012年第3期26卷 188-193页

作者：黄佛君段汉明金海龙西北大学城市与环境学院西安710127 新疆师范大学地理科学与旅游学院乌鲁木齐830054

绿洲是干旱区特有的一种景观,绿洲的封闭性、分散性,惟水性,使得每一绿洲都是一个完整的文化景观场域,文中以布尔迪厄的场域理论为基础,以绿洲自然景观为基底,以绿洲为元场,以清真-巴扎-社会空间文化景观为子场,诠释、演绎了绿洲旅游文... 详细信息

绿洲是干旱区特有的一种景观,绿洲的封闭性、分散性,惟水性,使得每一绿洲都是一个完整的文化景观场域,文中以布尔迪厄的场域理论为基础,以绿洲自然景观为基底,以绿洲为元场,以清真-巴扎-社会空间文化景观为子场,诠释、演绎了绿洲旅游文化景观的生成机理、结构模式、演变机制,以期为绿洲民族文化旅游资源的深度开发利用与保护提供理论参考。

关键词：旅游资源文化景观新疆绿洲巴扎精神文化社会空间

维普期刊数据库

Conodonts from the Upper Cambrian Sesong and Hwajeol Formations in the Sabuk Area, South Korea

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2002年第2期76卷 155-165页

作者： LEE Byung-SuDepartment of earth Science Education, Chonbuk National university,Jeonju, 561-756, Korea Zhu Xiling Chonbuk Natl Univ Dept Earth Sci Educ Jeonju 561756 South Korea

This paper presents a conodont biostratigraphic study on the Upper CambrianSesong and Hwajeol Formations in the Sabuk area, Korea. Two samples near the base of the SesongSlate at the Pukil section contain lower Upper Cambrian conodonts, comprising Furnishina furnishi,F. kranzae, F. pernica?, F. triangulata, Hertzina elongata, Laiwugnathus doidyxus?, Phakeloduselongatus, Muellerodus? obliquus, Westergaardodina matsushitai and W. moessebergensis. This is thefirst conodont record of the Upper Cambrian formations recovered yet in the northern limb of thePaekunsan syncline. The faunal assemblage is correlatable with the lower Upper Cambrian *** Zone of North china. Four local biozones are recognized in the Hwajeol Formation, *** Proconodontus, Eoconodontus notchpeakensis, cambrooistodus minutus and Cordylodus proavus Zonesin ascending order. This zonal scheme is essentially equivalent to that of the southern limb of thePaekunsan syncline and they are correlatable with zones in other parts of the world, including NorthAmerica, Australia, Iran and china.

关键词： Upper Cambrian conodonts biostratigraphy Korea

维普期刊数据库

β-hydroxybutyrate,glucose,calcium,phosphorus,and vitamin C concentrations in blood of dairy cows with subclinical ketosis during the early lactation

在线全文

学校读者我要写书评

暂无评论

β-hydroxybutyrate,glucose,calcium,phosphorus,and vitamin C ...

中国畜牧兽医学会家畜内科学分会2009年学术研讨会

作者： Zhigang Zhang~(1,2),Guowen Liu~1,Xiaobing Li~1,Zhe Wang~(1*) 1 college of Animal Science and Veterinary Medicine,jilin university,changchun 130062 2.college of Veterinary Medicine,Northeast Agriculture university,Harbin,150030

The objective of this study was to examine the association betweenβ-hydroxybutyrate(BHBA) and glucose,Calcium(Ca),phosphorus(P),and vitamin C concentrations in dairy healthy and with subclinical ketosis cows during an early lactation *** blood from 99 healthy cows and 26 subclinically ketotic cows within the first two months of lactation was *** concentration of BHBA was measured by enzymatic-rate method,glucose by oxidase method,and P by colorimetric method. These tests were performed in a biochemical *** Ca concentration was measured by atomic absorption spectrometer followed by acid *** C was measured by *** results showed that serum BHBA was significantly increased(P0.05).The serum BHBA concentration was negatively correlated with the serum glucose and Ca concentrations(P<0.01).Vitamin C and P status of cows with subclinical ketosis was not affected by *** Ca concentration can be used as a reference index for the diagnosis of subclinical ketosis.

关键词： dairy cows subclinical ketosis β-hydroxybutyrate calcium glucose vitamin C.

Statistical analysis on adaptive evolution of SQUA genes in angiosperms

在线全文

cnki会议

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2005年第1期 94-97页

作者： CHEN Yongyan 1,2, ZHONG Yang 3*, TIAN Bo 1, YANG Ji 4 and LI Dezhu 1*(1. Laboratory of Plant Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of sciences, Kunming 650204, china 2. college of Bioengineering, Dalian university, Dalian 116622, china 3. Ministry of Education Key Laboratory for Biodiversity and Ecological Engineering, School of Life Science, Fudan university, Shanghai 200433, china 4. college of Life sciences, Peking university, Beijing 100871, china) Laboratory of Plant Biodiversity and Biogeography，Kunming Institute of Botany，Chinese Academy of sciences，Kunming 650204 China college of Bioengineering，Dalian university，Dalian 116622，china Ministry of Education Key Laboratory for Biodiversity and Ecological Engineering，School of Life Science，Fudan university，Shanghai 200433，china Laboratory of Plant Biodiversity and Biogeography，Kunming Institute of Botany，Chinese Academy of sciences，Kunming 650204 China college of Life sciences，Peking university，Beijing 100871，china

SQUAMOSA (SQUA) subfamily includes important perianth identity genes of MADS-box gene family. SQUA genes of Dendrocalamus latiflorus were sequenced, and phylogenetic form on SQUA genes in angiosperms was analyzed. Relative rate and adaptive evolution after SQUA gene duplication in recent common ancestor of monocots and eudicots were analyzed using the methods of relative rate test, statistic on synonymous and non-synonymous coden substitution sites and likelihood rate test. The results show that both of relative rate and synonymous and non-synonymous coden substitution in eudicot clade are significantly higher than those in monocot clade, and the value of d N/d S uncovered possible positive selective pressure in eudicot clade.

关键词： angiosperms Dendrocalamus latiflorus SQUA gene relative rate test likelihood rate test adaptive evolution.

用作人体植入物的含铈钛合金的生物安全性评价

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国稀土学报 2004年第2期22卷 261-265页

作者：张新平于思荣张学军劳凤学刘耀辉柳忠辉何镇明吉林大学材料科学与工程学院吉林长春130025 吉林大学基础医学院吉林长春130021

采用体内急性全身性毒性实验、溶血实验、MTT实验(Tetrazolium basedcolorimetricassay)和材料浸渍液培养细胞的形态学观察法实验对含铈钛合金的生物安全性进行了初步的评价。用X射线光电子能谱仪XPS分析了合金表面氧化膜成分,并用原子... 详细信息

采用体内急性全身性毒性实验、溶血实验、MTT实验(Tetrazolium basedcolorimetricassay)和材料浸渍液培养细胞的形态学观察法实验对含铈钛合金的生物安全性进行了初步的评价。用X射线光电子能谱仪XPS分析了合金表面氧化膜成分,并用原子发射光谱仪ICP检测了浸渍液中合金元素的种类和浓度。结果显示:含铈和不含铈的Ti Fe Mo Mn Nb Zr系合金表面均形成了以TiO2为主的致密氧化膜,浸渍液中均存在浓度为0.2～0.27mg·L-1的Fe和0.16～0.87mg·L-1的Mn,这种义齿材料有利于补充人体所需的Fe和Mn;两者均未见任何急性毒性反应;溶血程度为0.558%～0.67%,有良好的血液相容性;细胞毒性实验评价级别为0和1级,无明显的细胞毒性作用;倒置相差显微镜观察细胞形态,未发现异常。由以上结果可以初步认为在实验浓度范围内的铈生物安全性是能够保证的。

关键词：病毒学铈 Ti-Fe-Mo-Mn-Nb-zr合金生物安全性牙科材料稀土

维普期刊数据库

Specific dynamic action and growth performance in fish

在线全文

学校读者我要写书评

暂无评论

Specific dynamic action and growth performance in fish

2008北京国际生理科学学术大会

作者： FU Shi-Jian college of Life sciences,Chongqing Normal university,Chongqing,400047,china

The increase in oxygen consumption rate(V

关键词： specific dynamic action locomotion

Input-to-State Stability of Recurrent Neural Networks with Time-Varying Delays and Markovian Switching

在线全文

cnki会议

学校读者我要写书评

暂无评论

Input-to-State Stability of Recurrent Neural Networks with T...

第24届中国控制与决策会议

作者： Yong Xu,School of Mathematical sciences and Computing Technology, Central South university Song Zhu college of sciences, china university of Mining and Technology

This paper presents an algebraic criterion for the input-to-state stability （ISS） of recurrent neural networks with Markovian switching. The criterion is easy to be verified with the connection weights. A numerical ... 详细信息

关键词： Input-to-State stability Recurrent Neural Network Time-Varying Delay Markov Chain

Study on estimate method of wave velocity and quality fac-tor to fault seals

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science Bulletin 2005年第19期 125-130页

作者： LI Zhensheng1, LIU Deliang1, LIU Bo1, YANG Qiang1 & LI Jingming2 1. The School of earth and Space sciences, university of Science and Technology of china, Hefei 230026, china 2. Research Institute of Petroleum Exploration and Development, Petro-china, Langfang 065007, china

Based on ultrasonic test of fault rocks, the re-sponses for wave velocity and quality factor (Q value) to lithology, porosity and permeability of fault rocks and me-chanical property of faults are studied. In this paper, a new quantitative estimate method of fault seals is originally of-fered. The conclusions are as follows: (1) Wave velocity and Q value increase and porosity decreases with the increase in stress perpendicular to joint; (2) In compressive and com-presso-shear fault rocks that are obviously anisotropic com-pared with their original rocks, the wave velocity and Q value are greater in the direction parallel with foliation, and usually less perpendicular to it. In tensile and tenso-shear fault rocks that are not obviously anisotropic, the wave ve-locity and Q value are under that of original rocks; (3) In foliated fault rocks, the direction with minimal wave velocity and Q value is the best direction for sealing; on the contrary it is the best for flowing; (4) Structural factures develop mainly along foliation, the minimal wave velocity and Q value reflect the flowing capacity in parallel direction to fo-liation, and the maximal wave velocity as well as Q value reflect the sealing capacity in normal direction to foliation. The new estimate method is based upon contrast of wave velocity and Q value between fault rocks and their original rocks, and is divided into three parts that are respectively to identify rock’s lithology, to judge mechanic property of faults and to Judge sealing capacity of faults. Although there is vast scale effect between ultrasonic wave and seismic wave, they have similar regularity of response to fabric and porosity of faults. This research offers new application for seismic data and petrophysical basis for seismological estimation of fault seals. The estimate precision will be improved with the en-hancement of three-dimensional seismic prospecting work.

关键词： wave velocity quality factor fault seals anisotropy folia-tion.