云南黑颈长尾雉(Syrmaticus humiae)分布及栖息地类型调查

黑颈长尾雉是鸡形目鸟类中的濒危物种,分布局限于印度东北部、缅甸北部、泰国西北部和中国西南部。在中国,该雉仅栖息于广西西部和云南中部、西部及南部地区。1992年至1995年在云南对黑颈长尾雉的分布及栖息生境进行了专门的调查,共有13县18个地点记录到黑颈长尾雉分布。通过访问还获得一些可能有黑颈长尾雉分布但需进一步证实的地点。黑颈长尾雉在云南的栖息生境主要有热带季雨林、亚热带常绿阔叶林、暖温性针叶林、暖热性针叶林和落叶阔叶林等5种类型。栖息地丧失和高强度狩猎是导致黑颈长尾雉濒危的主要原因。

基于聚类和多重评价法的河流质量评价研究

采用多重评价方法与聚类分析法对研究很少的大型江河——沅江下游的水质情况开展了调查、分析和质量评价。主成分分析法评价该江段的水质均属于Ⅰ类~Ⅱ类;加权的Topsis法、综合指数评价法、模糊识别评价法和判别分析法计算也均属于Ⅰ类~Ⅱ类,且方法间重复性较高,相互补充。UPGMA聚类分析发现,沅江桃源江段的水质可分为三个亚区;从修正TSI来看,所调查样点多为中营养水体;Ross法评判发现江段下游水质有变差趋势,除下游靠近县城水体外,多数仅为轻度污染水。总之,采用多重评价法综合对比才能弥补单一方法存在的漏洞,采用主

Mode-locking by nanotubes of a Raman laser based on a highly doped GeO 2 fiber

A mode-locked Raman laser, using 25 m of a GeO2 doped fiber as the gain medium, is reported employing carbon nanotubes. The oscillator generates 850 ps chirped pulses, which are externally compressed to 185 ps. © 2012 OSA.

福尔马林灭活柱状黄杆菌对草鱼免疫相关基因表达的影响

在本研究中,将福尔马林灭活的柱状黄杆菌菌苗(FKG4)经腹腔注射免疫草鱼,以注射灭菌PBS作对照,分别在免疫后1、7、15和28d,提取受免鱼和对照鱼肝脏、脾脏和头肾3种组织中的总RNA并反转录成cDNA,利用Real-time PCR方法对不同组织中C-反应蛋白(CRP)、主要组织相容性复合体I(MHCⅠ)、肿瘤坏死因子(TNFα)、白介素1(IL-1β)、白介素8(IL-8)、Ⅰ型干扰素(IFNⅠ)等6种免疫相关基因的表达进行定量分析。结果发现CRP在受免鱼肝脏中的表达于免疫后1、7d显著高于对照鱼,

Flame interactions in turbulent premixed twin V-flames

Multiple flame-flame interactions in premixed combustion are investigated using direct numerical simulations of twin turbulent V-flames for a range of turbulence intensities and length scales. Interactions are identified using a novel automatic feature extraction (AFE) technique, based on data registration using the dual-tree complex wavelet transform. Information on the time, position, and type of interactions, and their influence on the flame area is extracted using AFE. Characteristic length and time scales for the interactions are identified. The effect of interactions on the flame brush is quantified through a global stretch rate, defined as the sum of flamelet stretch and interaction stretch contributions. The effects of each interaction type are discussed. It is found that the magnitude of the fluctuations in flamelet and interaction stretch are comparable, and a qualitative sensitivity to turbulence length scale is found for one interaction type. Implications for modeling are discussed. © 2013 Copyright Taylor and Francis Group, LLC.

根足类原生动物半圆表壳虫壳体生物矿化特征

以有壳阿米巴类原生动物 (肉鞭门 ,叶足纲 )半圆表壳虫 (Arcellahemisphaerica)为研究对象 ,利用光镜和扫描电镜研究了其壳体生物矿化的特征。结果显示 :矿化前期 ,壳体为无色透明且柔软易变形 ;中期 ,为黄色较坚硬 ;后期 ,为褐色坚硬。通过X 射线显微分析术鉴定不同矿化时期壳体的无机元素 ,结果表明 ,与矿化前期相比矿化中期和后期壳体中Si、Mn和Fe的比例增加 ,Cl、K、S和Na的比例减少。由此推测 ,⑴半圆表壳虫矿化过程中壳体坚硬的原因是Si、Mn和Fe的比例增加导致 ,黄色

中国淡水与土壤有壳肉足虫最新分类名录及其区系分析

在回顾中国淡水与土壤有壳肉足虫研究历史的基础上 ,根据最新分类系统修订了已报道淡水与土壤有壳肉足虫的分类 ,共计 3纲 3目 2 0科 38属 2 4 4种 (包括 5 2亚种 )。其中淡水种类 37属 2 33种及亚种 ,土壤种类 18属 6 4种及亚种 ,淡水与土壤共有 17属 5 3种及亚种。首次对中国淡水有壳肉足虫进行区系分析 ,用Jaccard共同系数分析西藏、贵州梵净山、湖南索溪峪、湖北东湖、江苏南京等 5个地区的淡水有壳肉足虫区系相似性 ,区系相似性系数在 0— 0 2 5或 0 2 5—

瘤棘砂壳虫(肉足亚门:根足总纲)壳体元素组成(英文)

利用X射线能谱仪对采自中国湖北省木兰湖的瘤棘砂壳虫 (Difflugiatuberspinifera)壳体元素组成进行分析 ,结果发现 :构成壳体的化学元素主要为Si,其次是Ca和Al ,还有微量K、Na、Cl、Fe、Mg、S和P。分析表明瘤棘砂壳虫壳体化学元素的构成介于海洋和土壤有壳肉足虫之间。

Composite electrospun gelatin fiber-alginate gel scaffolds for mechanically robust tissue engineered cornea.

A severe shortage of good quality donor cornea is now an international crisis in public health. Alternatives for donor tissue need to be urgently developed to meet the increasing demand for corneal transplantation. Hydrogels have been widely used as scaffolds for corneal tissue regeneration due to their large water content, similar to that of native tissue. However, these hydrogel scaffolds lack the fibrous structure that functions as a load-bearing component in the native tissue, resulting in poor mechanical performance. This work shows that mechanical properties of compliant hydrogels can be substantially enhanced with electrospun nanofiber reinforcement. Electrospun gelatin nanofibers were infiltrated with alginate hydrogels, yielding transparent fiber-reinforced hydrogels. Without prior crosslinking, electrospun gelatin nanofibers improved the tensile elastic modulus of the hydrogels from 78±19 kPa to 450±100 kPa. Stiffer hydrogels, with elastic modulus of 820±210 kPa, were obtained by crosslinking the gelatin fibers with carbodiimide hydrochloride in ethanol before the infiltration process, but at the expense of transparency. The developed fiber-reinforced hydrogels show great promise as mechanically robust scaffolds for corneal tissue engineering applications.

微卫星DNA遗传分析在原生动物学中的研究进展

国家自然科学基金资助项目 ( 39730 0 70 ); 中国科学院创新基金资助项目 ( 2 2 0 2 0 7)资助