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Search Results: 1 - 10 of 81372 matches for " XU Cai-Guo "
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作物数量性状基因研究进展 Advance in Crop Quantitative Trait Loci
邢永忠,徐才国XING Yong-zhong,XU Cai-guo
遗传 , 2001,
Abstract: 分子生物技术的发展对作物数量性状基因(QTL)研究提供了条件,不同的定位群体各有其特点,相继出现的QTL定位方法也逐步完善.大量的研究揭示了QTL的基本特征,剖析了重要农艺性状的遗传基础,给作物遗传改良带来了新的策略,不断深入的研究已经完成了特定QTL的精细定位和克隆.本文从QTL的定位群体,定位方法,研究现状,精细定位与克隆,以及QTL利用等方面对作物数量性状基因的研究进行了综述。 Abstract:With the rapid development of molecular biotechnology,QTL analyses were executed for a lot of important agronomic traits in many crops.Different experimental populations and mapping methods had their own advantages in QTL analysis.Amounts of studies paid attention to locate the QTLs for important traits,and others tried to disect the genetic bases using molecular markers.Near isogenic lines were the best populations for QTL fine mapping and positional cloning,A few studies had been reported their results on materials with improvement traits using marker-assisted selection.This paper summarizes the recent progress on QTL mapping populations and methods,the status of QTL locating,QTL fine mapping and positional cloning,and QTL.application in breeding.
The Gene Mapping and Interaction on the Fertility Reversibility in Photoperiod_sensitive Genic Male Sterile Rice (Oryza sativa L)
籼型光敏核不育水稻育性可转换性的基因定位和基因互作研究

HE Yu-Qing,XU Cai-Guo,
何予卿
,徐才国

植物学报 , 2001,
Abstract: 本研究以来源于农垦58S的籼型光敏核不育系培矮64S(短日条件下育性难转换)和8902S(短日条件下育性易转换)及其F1、F2群体为材料,通过短日不同光温和不同生态条件4种处理,利用RFLP分子标记研究了影响光敏核不育水稻在短日条件下的育性可转换性的遗传、基因定位和基因互作,主要结果表明:影响光敏核不育水稻的育性可转换性表现为微效基因的作用,定位了7个控制光敏核不育水稻的育性可转换性QTL,即S2、S3a、S3b、S5、S8和S10。揭示了基因互作真实存在于光敏核不育水稻中,基因互作形式和互作类型对光敏核不育水稻的育性可转换性的影响表现多种多样,不同类型的基因互作所解释的遗传变异处于2.15%~10.07%之间。
Design of Omni-Directional Tilt Sensor Based on Machine Vision  [PDF]
Yi-Ping Tang, Cai-Guo Chen
Journal of Sensor Technology (JST) , 2011, DOI: 10.4236/jst.2011.14015
Abstract: This paper presents a new Omni-Directional Tilt Sensor (ODTS), which consists of the LED light, transparent cone-shaped closed container, mercury, camera, embedded systems and so on. The volume of the mercury in the container is equal to half of the container’s. When the detected surface is horizontal, the shape of mercury in the image captured by the camera is a black disc since the mercury is lightproof. When the detected surface tilts, the mercury flows and the mercury surface always maintains horizontally due to the gravity force of the earth. At this time, some area of the transparent cone-shaped closed container is not shaded by mercury and the border of the mercury’s shape in the captured image is a half circle and a half ellipse. Thus there is a translucent crescent-shaped area in the image. With analyzing this area by the specific algorithm based on machine vision, the tilt angle and directional angle can be obtained. The experimental results show that the ODTS proposed has some advantages, such as simple maintenance, high precision, wide range, low cost, real-time, reliability and high visualization.
Two pleiotropic intervals of rice were assessed using NILs constructed by two methods
利用两种方法构建的近等基因系对水稻两个多效区段遗传效应进行评价

ZHANG Yu-Shan,WU Wei,XU Cai-Guo,
张玉山
,吴薇,徐才国

遗传 , 2008,
Abstract: Spikeletes per panicle (SPP) is one of the important yield components in rice (Oryza sativa L.). Appropriate heading date (HD) and plant height (PH) are prerequisites for desired yield. In this study, the near isogenic lines (NILs) of chromosome 7, which harbored QTLs controlling HD, PH and SPP were constructed based on the primary QTLs results of the recombinant inbred lines (RILs) derived from Zhenshan 97 and HR5. The near isogenic lines (RILs) of chromosome 8, which harbored QTLs of HD, PH, and SPP, were constructed using heterogeneous inbred family based on RILs. The genetic effects of two pleiotropic intervals were assessed accurately in these two NILs. The QTLs identified by the two near isogenic lines indicated that the three traits were controlled by the same QTL or tightly linked QTL. The QTLs controlling the three traits had the same direction on additive effects and dominant effects. And these traits showed bimodal or discontinuous distributions in respective NILs. These results imply that the same gene might control the three traits simultaneously (i.e., the gene pleiotropism). Along with this, the relationships between HD and PH and yield, the application of significantly positive correlation for the three traits in breeding program, and the advantage and disadvantage of the two constructing NILs methods were also discussed in this study.
Biological characters of rice on P-deficient soils with different pH value
不同pH低磷土壤上的水稻生物学性状

GUO Zai-hua,HE Li-yuan,WU Zhao-hui,XU Cai-guo,
郭再华
,贺立源,吴照辉,徐才国

应用生态学报 , 2007,
Abstract: With pot culture, this paper studied the biological characters of four low-P tolerant rice genotypes 99011,580,508 and 99112 and two low-P sensitive rice genotypes 99012 and 99056 on three P-deficient soils with different pH. The results indicated that on test soils, 580, 508 and 99112 had similar low-P tolerant ability. 99011 had poor low-P tolerant ability on alkaline soil, with its relative grain yield being 11.9% and 10. 4% less than that on acid and neutral soil, respectively. 99012 showed a relatively stronger low-P tolerant ability on alkaline soil, and its relative grain yield was 19.6% higher than that on acid soil and 22. 2% higher than that on neutral soil. 99056 showed a stronger low-P tolerant ability on acid soil, and its relative grain yield was 25.0% and 19.6% higher than that on alkaline and neutral soil, respectively. The effects of soil P level and soil type on rice grain yield mainly manifestied on the number of available spike. The P concentration and its relative value in flag leaves of 99011, 580, 508 and 99112 were significantly higher than those of 99012 and 99056, which might be another factor resulting in the stronger low-P tolerant ability of 99011,580, 508 and 99112 than 99012 and 99056.
A New Triterpenoid Saponin from Abrus precatorius Linn
Zhi-Hui Xiao,Fa-Zuo Wang,Ai-Jun Sun,Chuan-Rong Li,Cai-Guo Huang,Si Zhang
Molecules , 2012, DOI: 10.3390/molecules17010295
Abstract: A new triterpenoid saponin, 3-O-β-D-glucopyranosyl-(1→2)-β-D-glucopyranosyl subprogenin D (1), together with six known triterpenoids: subprogenin D (2), abrusgenic acid (3), triptotriterpenic acid B (4), abruslactone A (5), abrusogenin (6) and abrusoside C (7) were isolated from the leaves and stems of Abrus precatorius. Their structures were elucidated on the basis of physical and NMR analysis, respectively. Compounds 5 and 6 showed moderate cytotoxicity against MCF-7, SW1990, Hela, and Du-145 cell lines. Compounds 1, 2 and 4 were isolated from this plant for the first time.
The Fractal Dimensions of Complex Networks

GUO Long,CAI Xu,

中国物理快报 , 2009,
Abstract:
The macro-behavior of agents' opinion under the influence of an external field
YunFeng Chang,Long Guo,Xu Cai
Physics , 2006, DOI: 10.1088/0256-307X/24/8/075
Abstract: In this paper, a model about the evolution of opinion on small world networks is proposed. We studied the macro-behavior of the agents' opinion and the relative change rate as time elapses. The external field was found to play an important role in making the opinion $s(t)$ balance or increase, and without the influence of the external field, the relative change rate $\gamma(t)$ shows a nonlinear increasing behavior as time runs. What's more, this nonlinear increasing behavior is independent of the initial condition, the strength of the external field and the time that we cancel the external field. Maybe the results can reflect some phenomenon in our society, such as the function of the macro-control in China or the Mass Media in our society.
A self-organized particle moving model on scale free network with $1/f^{2}$ behavior
YunFeng Chang,Long Guo,Xu Cai
Physics , 2006,
Abstract: In this paper we propose a self-organized particle moving model on scale free network with the algorithm of the shortest path and preferential walk. The over-capacity property of the vertices in this particle moving system on complex network is studied from the holistic point of view. Simulation results show that the number of over-capacity vertices forms punctuated equilibrium processes as time elapsing, that the average number of over-capacity vertices under each local punctuated equilibrium process has power law relationship with the local punctuated equilibrium value. What's more, the number of over-capacity vertices has the bell-shaped temporal correlation and $1/f^{2}$ behavior. Finally, the average lifetime $L(t)$ of particles accumulated before time $t$ is analyzed to find the different roles of the shortest path algorithm and the preferential walk algorithm in our model.
The spin and orbital moment contributions of each element to macroscopic magnetization in Co0.9Fe0.1 films
Yuxian Guo,Jie Wang,Honghong Li,Pengshou Xu,Jianwang Cai
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2082-4
Abstract: Co-Fe alloy films have such properties as high saturation magnetization, high Curie temperature and low coercive force. It is of importance to study the origin of high saturation magnetization in these alloys. In this paper, we study the spin (m s) and orbital moments (m o) of Fe and Co in the Co0.9Fe0.1 film by using X-ray magnetic circular dichroism (XMCD) and SQUID magnetometry. The m s and m o for Co are 1.58 and 0.31 μB, and for Fe are 1.63 and 0.36 μB respectively. The average magnetic moment (1.90 μB) determined by XMCD is in agreement with that obtained from SQUID measurements. The total magnetic moment ratio of Fe to Co is 10.5:89.5, while the ratio of the spin to orbital moment is 83.4:16.6. Considering the separation of the spin and orbital moment, an outcome of m Fe-spin: m Fe-orbit: m Co-spin: m Co-orbit = 8.6:1.9:74.8:14.7 is obtained.
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