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Search Results: 1 - 10 of 124270 matches for " ZHANG Yong-pu "
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Ultrastructure of Spermatozoa of Eumeces elegans

LIU Yong-zhang,ZHANG Yong-pu,

动物学研究 , 2004,
Abstract: We studied the ultrastructure of epididymal spermatozoa of Eumeces elegans.After epididymal tissues of E.elegans were double fixed with 2.5% glutaric dialdehyde and 1% osmic acid,the ultrathin section were observed under H-600 transmission electron microscopy.The spermatozoa contain two major components,a head and a tail.The head contains an acrosomal complex and a nucleus,and the tail a neck,a midpiece,a principal piece and an endpiece.The mature spermatozoa are characterized by:a depressed acrosome at the anterior portion;an acrosomal vescile divided into cortex and medulla;a subacrosomal cone filled with paracrystalline subacrosomal material;a pointed prenuclear perforatorium;a stopper-like perforatorium base plate;an elongated nucleus;an epinuclear lucent zone;rounded nuclear shoulders;a coned nuclear fossa;a bilateral stratified laminar structure within neck region;absence of a endonuclear canal;a long axis of the proximal centriole almost vertical to that of the distal centriole;nine peripheral dense fibres connecting inward with the corresponding 9 triplets of the distal centriole,and backward with the doublets of the axoneme;central fibres connecting with the two central singlets;a short midpiece;columnar mitochondria with linear cristae;each intermitochondrial ring structure consisting of the complete ring of small regularly ovoid or small trapezoid dense bodies;a fibrous sheath into the midpiece;an annulus closely attached to the inner surface of the plasma membrane;the arrangement pattern of the ring structure and mitochondria in rs1/mi1,rs2/mi2,rs3/mi3,and rs4/mi4;mitochondria in order of 10 in transverse section;a thin zone of cytoplasm at the anterior portion of the principal piece;the enlarged fiber 3 and fiber 8 disappearing at the anterior portion of the principal piece;the axoneme complex having an usual 9 2 pattern.The sperm ultrastructure of E.elegans is similar to that of the species within the Sphenomorphus and the Egernia groups,but evidence of spermatozoal autapomorphies is not found in E.elegans.
Inter-population Differences in Reproductive Life-history Traits of Blue-tailed Skinks (Eumeces elegans) from Hangzhou and Ningde, Eastern China

ZHANG Yong-pu,DU Wei-guo,SHOU Lu,

动物学研究 , 2006,
Abstract: We measured body size and reproductive traits of blue-tailed skinks (Eumeces elegans) from two localities at different latitudes in Eastern China to reveal their inter-population differences in reproductive life-history strategies sp. Females from Ningde, the locality at a lower latitude, produced their eggs from 27th May to 22nd June; whereas females from Hangzhou, the locality at a higher latitude, produced eggs from 4th June to 12th July. Snout-vent lengths of the minimum reproductive female and adult skinks in Ningde population were smaller than that in Hangzhou population. Females from the two populations did not show significant difference in relative clutch mass. After the effect of maternal snout-vent length was statistically removed, clutch size and clutch mass did not differ between the two populations, but mean egg mass still showed considerable inter-population difference, with larger eggs in Hangzhou skinks. This study revealed negative correlation between clutch size and egg mass, and inter-population difference in trade-offs between clutch size and egg size. For a given clutch size, females from Hangzhou laid larger eggs than did those from Ningde. Therefore, in E. elegans, reproductive life histories differ significantly between the two populations, and maternal body size accounts for a large quantity of such inter-population differences. These results suggest that the reproductive strategies for this species change from a high-latitudinal population to a low-latitudinal population.
Ultrastructure of the Spermatozoon of the Northern Grass Lizard (Takydromus septentrionalis) with Comments on the Variability of Sperm Morphology Among Lizard Taxa

ZHANG Yong-pu,YING Xue-ping,JI Xiang,

动物学研究 , 2005,
Abstract: We studied the ultrastructure of the spermatozoon of northern grass lizards ( Takydromus septentrionalis , n = 5) collected in April 2003 from a population in Wenzhou, Zhejiang, eastern China. The mature spermatozoa are characterized by: A circular acrosome; an acrosomal vesicle divided into cortex and medulla; the unilateral ridge of the acrosome vesicle divided into cortex and medulla, the electron-lucent zone between them; a prenuclear perforatorium, absence of the perforatorium base plate; presence of the subacrosomal space; an elongated nucleus, absence of a endonuclear canal; absence of epinuclear lucent zone; rounded nuclear shoulders. A bilateral stratified laminar structure within the neck region. A short midpiece; absence of multilaminar membranes; in longitudinal section, two tiers of mitochondria, in transverse section, six mitochondria with linear cristae; the presence of two dense body groups, the ring structure consisting of the complete ring; the arrangement pattern of the ring structure and mitochondria in rsl/mil and rs2/mi2; a fibrous sheath in the midpiece; presence of an annulus. A thin granular zone of cytoplasm at the anterior portion of the principal piece; the enlarged fiber 3 and fiber 8 disappearing at the anterior portion of the principal piece; the axoneme complex having an usual 9 + 2 pattern. Within lacertid lizards, sperms differ among species in the number of mitochondria, but in all species studied so far, there are two groups of dense bodies. However, lizards of different taxa differ, in various degrees, in such sperm morphological traits as acrosome vesicle, subacrosomal space, epinuclear lucent zone, perforatorium base plate, nuclear shoulder and number and arrangement of mitochondria and dense bodies. These differences suggest that sperm morphology provides additional information which one may use to study the phylogeny of lizards.
Morphological variation in three geographical populations of Estellarca olivacea

ZHANG Yong-pu,YING Xue-ping,WANG Tie-gan,CHAI Xue-liang,

海洋科学 , 2009,
Abstract: Based on nine morphological characters of populations of Estellarca olivacea from Zhejiang Lingkun, Zhejiang Sanmen and Jiangsu Tongzhou, the morphological variations of three geographical populations were studied by means of multivariate morphometrics. The results of cluster analysis and principal component analysis revealed that the morphological characters of E. olivacea from Zhejiang Sanmen population and Zhejiang Lingkun population were similar to each other but were much more different from the character of Jiangsu Tongzhou population. In the principal component analysis, two principal components were constructed. The contributory ratios of the two principal components were 47.73% and 13.56% respectively and the cumulative contributory ratio was 61.29%. The shell protrusion or flat, shell thick and fore-and-aft shape determined the morphological variations of different geographical populations of E. olivacea, which were related with the water temperature and substrate.
Comparison of different Gekko japonicus populations reproductive traits

ZHU Ling-jun,HU Ling-jun,ZHANG Yong-pu,SHEN Jian-wei,DU Wei-guo,

生态学杂志 , 2009,
Abstract: 对浙江地区3个多疣壁虎(Gekko japonicus)种群的个体大小、繁殖生活史特征进行了测定。在24 ℃、28 ℃和31 ℃条件下,孵化多疣壁虎卵,并测定其孵化期和幼体特征。结果表明:多疣壁虎成体存在显著种群间变异和两性差异,即衢州和温州个体大于杭州个体,雌体大于雄体;卵平均质量和窝卵重无显著种群间差异,但杭州壁虎的相对窝卵重显著大于衢州和温州个体;孵化温度能显著影响孵化期及幼体的尾长和头宽,但不影响幼体体长、体质量及运动能力;孵化温度效应不存在种群间差异。本研究揭示了疣壁虎个体大小、繁殖输出以及卵孵化特征的微地理变异。
Towards Cooperation by Carrier Aggregation in Heterogeneous Networks: A Hierarchical Game Approach
Pu Yuan,Yong Xiao,Guoan Bi,Liren Zhang
Computer Science , 2015,
Abstract: This paper studies the resource allocation problem for a heterogeneous network (HetNet) in which the spectrum owned by a macro-cell operator (MCO) can be shared by both unlicensed users (UUs) and licensed users (LUs). We formulate a novel hierarchical game theoretic framework to jointly optimize the transmit powers and sub-band allocations of the UUs as well as the pricing strategies of the MCO. In our framework, an overlapping coalition formation (OCF) game has been introduced to model the cooperative behaviors of the UUs. We then integrate this OCF game into a Stackelberg game-based hierarchical framework. We prove that the core of our proposed OCF game is non-empty and introduce an optimal sub-band allocation scheme for UUs. A simple distributed algorithm is proposed for UUs to autonomously form optimal coalition formation structure. The Stackelberg Equilibrium (SE) of the proposed hierarchical game is derived and its uniqueness and optimality have been proved. A distributed joint optimization algorithm is also proposed to approach the SE of the game with limited information exchanges between the MCO and the UU.
Dynamic Variation of Water Adaptability of Wheat in Gansu

PU Jin-yong,ZHANG Cun-jie,

资源科学 , 2008,
Abstract: 运用甘肃省西峰、天水农业气象试验站及环县等8个农业气象观测站1981年~2006年冬小麦生育期观测资料及西峰等14个气象站.1971年~2006年气象资料,建立了估算水分适宜性的水分适宜度模式.计算分析表明,甘肃省冬小麦种植区水分适宜度地域分布差异较大,其中以陇东南的徽成盆地、天水南部适宜性最好,陇东北部适宜性最差,陇东南地区平均比陇东偏高0.14.其年代际变化为:20世纪70年代偏高,80年代偏低,90年代偏高,21世纪初又开始偏低.冬小麦各生长发育阶段适宜性随时间变化较大,冬前生长期的水分适宜度以每10年0.02~0.03的速度上升,越冬期的水分适宜度以每10年0.01~0.02的速度下降.在冬小麦全生育期中,越冬期及拔节阶段的水分适宜性最好,旺盛生长阶段的水分适宜性最差,初夏阶段冬小麦的水分供需矛盾,是冬小麦生长发育的主要胁迫因子.
Bis(1,3,4-thiadiazol-2-yl) disulfide
Pu-Zhou Hu,Yong-Hua Zhang,Jian-Ge Wang,Jian-Hua Qin
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809036782
Abstract: The title compound, C4H2N4S4, lies about a twofold rotation axis situated at the mid-point of the central S—S bond. Each of two thiadiazole rings is essentially planar, with an rms deviation for the unique thiadiazole ring plane of 0.0019 (7) . C—H...N hydrogen bonds link adjacent molecules, forming zigzag chains along the c axis. In addition, these chains are connected by intermolecular S...S interactions [S...S = 3.5153 (11) ] , forming corrugated sheets, and further fabricate a three-dimensional supramolecular structure by intermolecular N...S contacts [S...N = 3.1941 (17) ].
Stable Solitons in Three Dimensional Free Space: Self-Trapped Bose-Einstein Condensates with Spin-Orbit Coupling
Yong-Chang Zhang,Zheng-Wei Zhou,Boris A. Malomed,Han Pu
Physics , 2015,
Abstract: By means of variational methods and systematic numerical analysis, we demonstrate the existence of stable solitons in three-dimensional (3D) free space, in the context of binary atomic condensates combining contact self-attraction and spin-orbit coupling, which can be engineered by available experimental techniques. Depending on the relative strength of the intra- and inter-component attraction, the stable solitons feature a semi-vortex or mixed-mode structure. In spite of the fact that the local cubic self-attraction gives rise to the supercritical collapse in 3D, the solitons are stable against random perturbations, motion, and collisions.
Single-photon scattering on a strongly dressed atom
Z. H. Wang,Yong Li,D. L. Zhou,Chang-pu Sun,Peng Zhang
Physics , 2011, DOI: 10.1103/PhysRevA.86.023824
Abstract: We develop the generalized rotating-wave approximation (GRWA) approach (Phys. Rev. Lett. 99, 173601 (2007)) to study the single-photon scattering on a two-level system (TLS) with arbitrarily strong coupling to a local mode in a one-dimensional (1D) coupled resonator array. We calculate the scattering amplitudes analytically, and the independent numerical results show that our approach works well in a broad parameter region. Especially, when the resonator mode is faroff resonance with the TLS, we obtain more reasonable results than the ones from the standard adiabatic approximation. Our approach is further extended to the cases with a 1D resonator array strongly coupled to more than one TLSs.
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