中国灵猫科的支序系统学分析

选取分布于中国境内的8属9种灵猫科动物的88个骨骼性状、31个外部形态性状和1个行为性状,运用替代外群法分别以赤狐(犬科狐属)和青鼬(鼬科貂属)共同或单独作为外群进行支序分析,得出10个支序图(其步长(TL)为106--136,一致性指数(CI)为0.581--0.660,保留指数(RI)为0.610--0.714。经合意分析得到4个相似的支序图,其TL为41--136,CI为0.581--0.732,RI为0.610--0.818,结果支持:(1)斑灵狸、大灵猫、小灵猫构成一个单系群,与传统分类一致(均属灵猫亚科);(2)椰子狸、花面狸、熊狸构成一个单系群,与传统分类一致(均属长尾狸亚科);(3)红颊meng、食蟹meng与灵猫科其他种为姐妹关系(Bootstrap检验支持率100%),建议meng类为一亚科;(4)长颌带狸拥有较多自近裔性状如三个门齿孔,是一个高度特化的种类,其系统地位有待进一步研究。

Immunolocalization and expression of vascular endothelial growth factor receptors (VEGFRs) and neuropilins (NRPs) on Keratinocytes in human epidermis

Vascular endothelial growth factor (VEGF) plays an important role in normal and pathological angiogenesis. VEGF receptors (VEGFRs, including VEGFR-1, VEGFR-2, and VEGFR-3) and neuropilins (NRPs, including NRP-1 and NRF-2) are high-affinity receptors for V

Adaptive modally addressed liquid crystal lenses

An adaptive lens, which has variable focus and is rapidly controllable with simple low-power electronics, has numerous applications in optical telecommunications devices, 3D display systems, miniature cameras and adaptive optics. The University of Durham is developing a range of adaptive liquid crystal lenses, and here we describe work on construction of modal liquid crystal lenses. This type of lens was first described by Naumov [1] and further developed by others [24]. In this system, a spatially varying and circularly symmetric voltage profile can be generated across a liquid-crystal cell, generating a lens-like refractive index profile. Such devices are simple in design, and do not require a pixellated structure. The shape and focussing power of the lens can be controlled by the variation of applied electric field and frequency. Results show adaptive lenses operating at optical wavelengths with continuously variable focal lengths from infinity to 70 cm. Switching speeds are of the order of 1 second between focal positions. Manufacturing methods of our adaptive lenses are presented, together with the latest results to the performance of these devices.

广西岜盆白头叶猴的种群动态

岜盆保护区现有白头叶猴136只,分属19个两性群、5个独雄群和1个双雄群,平均群大小5.44只/群,群密度0.26群/km~(2),种群密度1.44只/km~(2),白头叶猴的年龄组成为:成年猴80只,占58.82%,青年猴36只,占26.47%,幼猴20只,占14.71%。

真核生物TATA框的折叠结构特征

通过对真核生物142个基因的部分启动子序列的折叠模型进行分析研究,结果表明,这些基因的TATA框在折叠结构模型中所表现的茎环结构特征有利于与反式作用因子和RNA聚合酶的识别及其相互作用。

A comparison of the value of viscosity for several water models using Poiseuille flow in a nano-channel.

The viscosity-temperature relation is determined for the water models SPC/E, TIP4P, TIP4P/Ew, and TIP4P/2005 by considering Poiseuille flow inside a nano-channel using molecular dynamics. The viscosity is determined by fitting the resulting velocity profile (away from the walls) to the continuum solution for a Newtonian fluid and then compared to experimental values. The results show that the TIP4P/2005 model gives the best prediction of the viscosity for the complete range of temperatures for liquid water, and thus it is the preferred water model of these considered here for simulations where the magnitude of viscosity is crucial. On the other hand, with the TIP4P model, the viscosity is severely underpredicted, and overall the model performed worst, whereas the SPC/E and TIP4P/Ew models perform moderately.

Machine vision based concrete surface quality assessment

Manually inspecting concrete surface defects (e.g., cracks and air pockets) is not always reliable. Also, it is labor-intensive. In order to overcome these limitations, automated inspection using image processing techniques was proposed. However, the current work can only detect defects in an image without the ability of evaluating them. This paper presents a novel approach for automatically assessing the impact of two common surface defects (i.e., air pockets and discoloration). These two defects are first located using the developed detection methods. Their attributes, such as the number of air pockets and the area of discoloration regions, are then retrieved to calculate defects’ visual impact ratios (VIRs). The appropriate threshold values for these VIRs are selected through a manual rating survey. This way, for a given concrete surface image, its quality in terms of air pockets and discoloration can be automatically measured by judging whether their VIRs are below the threshold values or not. The method presented in this paper was implemented in C++ and a database of concrete surface images was tested to validate its performance. Read More: http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29CO.1943-7862.0000126?journalCode=jcemd4