云南鳅属一矮小型新种(鲤形目: 鳅科)

记述了采自云南的云南鳅属1新种: 异色云南鳅Y. discoloris sp. nov., 与Y. pleurotaenia及Y. nigromaculatus比较, 新种体矮小, 裸露无鳞片, 侧线不完全, 背鳍起于体中点, 口下位, 尾鳍分叉, 背鳍分枝鳍条8—9, 尾鳍分枝鳍条14, 腹鳍分枝鳍条7。图1表1参3

猕猴输精管注射高分子聚合物HFMC的抗生育试验初报

利用一种高分子聚合物HFMC注入输精管, 遇体液即合成有孔隙的固态聚合物 , 附着管壁并缓慢释放适度的H~(+), 以改变精子存活环境, 从而达到猕猴 非阻断性的输精管避孕。实验结果还表明: HFMC对精子具有致死、致畸率高及使 精子活力显著下降的作用, 这些作用随HFMC剂量的增大而加强, 随时间的后移 而逐渐减弱; HFMC对输精管具有可通性及可复性。HFMC有可能成为男性节育较为 理想的一种新型避孕剂。表2参6

墨江蜈蚣与少棘蜈蚣的比较研究. I.化学组成

对墨江蜈蚣(Scolopendra mojiangica) Zhang et Chi)与少棘蜈蚣(S. subspinipes mutilansL. Koch)的化学组成进行了比较分析。它们的蛋白质灼、烧残渣、水分含量基本相同。游离氨基酸挥发性脂肪酸和微量元素的相对含量也很接近, 但脂类和总糖的含量差异较大。

Expression, purification and characterization of recombinant Jerdonitin, a P-II class snake venom metalloproteinase comprising metalloproteinase and disintegrin domains

Jerdonitin is a P-II class snake venom metalloproteinase comprising metalloproteinase and disintegrin domains. In this study, we established a high-level expression system in Pichia pastoris and developed a purification strategy for the recombinant Jerdonitin. This recombinant Jerdonitin degraded fibrinogen at a level of activity comparable with its wild type. The effects of recombinant Jerdonitin on inhibiting ADP-induced human platelet aggregation were in a dose-dependent manner with an IC50 of 248 nM. In addition, we reported here that Jerdonitin can significantly inhibit the growth of several cell lines, including human liver cancer cells (Bel7402), human leukemia cells (K562) and human gastric carcinoma cells (BGC823). This study offers recombinant Jerdonitin that will be valuable for further functional and structural studies of Jerdonitin. (C) 2009 Elsevier Ltd. All rights reserved.

Effects of growth temperature of AlGaN buffer layer on the properties of A1(0.58)Ga(0.42)N epilayer by NH3-MBE

Al0.58Ga0.42N epilayers are grown by ammonia gas source molecular beam epitaxy (NH3-MBE) on (0001) sapphire substrate using AlGaN buffer layer. The effects of the buffer layer growth temperature on the properties of Al0.58Ga0.42N epilayer are especially investigated. In-situ high-energy electron diffraction (RHEED), double-crystal X-ray diffraction (DCXRD), atomic force microscopy (AFM), photoconductivity measurement and cathodoluminescence (CL) are used to characterize the samples. It is found that high growth temperature of AlGaN buffer layer would improve the crystalline quality, surface smoothness, optical quality and uniformity of the Al0.58Ga0.42N epilayer. The likely reason for such improvements is also suggested. (C) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

1.3 mu m high indium content (42.5%) GaInNAs/GaAs quantum wells grown by molecular beam epitaxy

High structural and optical quality 1.3 mu m GaInNAs/GaAs quantum well (QW) samples with 42.5% indium content were successfully grown by molecular beam epitaxy. The growth of well layers was monitored by reflection high-energy electron diffraction (RHEED). Room temperature photoluminescence (PL) peak intensity of the GaIn0.425NAs/GaAs (6 nm / 20 nm) 3QW is higher than, and the full width at half maximum (FWHM) is comparable to, that of In0.425GaAs/GaAs 3QW, indicating improved optical quality due to strain compensation effects by introducing N to the high indium content InGaAs epilayer. The measured (004) X-ray rocking curve shows clear satellite peaks and Pendellosung fringes, suggesting high film uniformity and smooth interfaces. The cross sectional TEM measurements further reveal that there are no structural defects in such high indium content QWs. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

生育年限对紫花苜蓿地上部生长的影响

2006年2-5月对杨凌区3年生和5年生紫花苜蓿(Medicago sativa L.)的株高、单株重量、产草量、生长速率、茎叶比、鲜干比和群落结构进行测定分析。结果表明5年生紫花苜蓿株高为132 cm,大于3年生紫花苜蓿109 cm(P<0.01);5年生紫花苜蓿单株重量152 g/株,大于3年生紫花苜蓿102 g/株(P<0.01);5年生紫花苜蓿的茎叶比0.43-1.67,小于3年生紫花苜蓿0.58-2.42。5年生紫花苜蓿产草量高于3年生紫花苜蓿(P<0.01),盛花期刈割时,鲜草产量分别达到6.17 kg/m2和4.10 kg/m2;5年生紫花苜蓿的鲜干比4.01-6.69,小于3年生紫花苜蓿4.12-7.26(P<0.01)。紫花苜蓿叶的最高密度位于地上80-100 cm层内;花序的最高密度位于120-140 cm层内;40 cm以下的生物量以茎为主,茎重由下层至上层递减;紫花苜蓿的茎叶比随植株高度的增加在不断的增大,60-140 cm之间各个层次3年生紫花苜蓿的茎叶比均大于5年生紫花苜蓿(P<0.01)。

Testing a single-aliquot protocol for recuperated OSL dating

IEECAS SKLLQG

42 MeV/u~(12)C与~(115)In反应的靶余核

本实验使用放射化学方法测定了42 MeV/u (12)C与~(115)In相互作用靶余核的生成截面。借助高斯电荷分布的假设得到了靶余核的质量分布。将实验得到的质量分布与熔合碎裂模型和级联的两体衰变模型进行了比较。特别值得注意的是，使用统计的两体衰变模型Monte Carlo GEMINI程序计算第一次与实验结果符合得非常满意。同时计算结果也表明：在42MeV/u的轰击能量下，完全熔合对靶余核的产物仍然有很大的贡献。在同样的假设下，得到了靶余核的同位素分布。可以看到，同位素分布的宽度随靶余核原子序数的增加而增加，在此对利用中能重离子反应生成新的远离β稳定线的缺中子核素进行了讨论

长白山地表藓类分布格局与环境因子的关系(英文)

对长白山自然保护区 41个样地中的 42种主要地表藓类分布与 6种重要环境因子间的关系进行了定量研究。应用双向指示种分析法 (TWINSPAN)发现调查的 41个样地可分成 4个样地组 ,42种地面藓类可分成 4种藓类群。应用除趋势典范对应分析 (DCCA)的研究结果表明 ,海拨高度、土壤含砂量、土壤酸度、林冠层郁闭度、土壤含水量是 5个影响 42种地表藓类分布格局的主要环境因子 ,在DCCA排序图上 ,显示出藓类群与样地类型良好的对应性 ,藓类群 1～ 4分别在落叶松 (Larixolgensis)沼泽地、高山苔原、暗针叶林、亚高山岳桦 (Betulaermanni)林和岳桦 落叶松林中占优势。