真空辐射加热基片的温度分布

真空辐射加热下基片表面温度分布的均匀性是薄膜制备中的关键问题之一。采用数值计算和比色红外测温两种方法，研究了作者自行研制的真空辐射加热器（IMCAS-VRH）的性能。利用IMCAS-VRH加热直径6in的单晶硅基片,当电功率为3860W时，基片表面平均温度为1093K,整个基片上的温度变化的测量值约为6 K。基片表面温度分布的计算结果与测量数据符合得很好，进一步的计算分析表明钼丝对辐射的遮挡效应、隔热屏和基片热传导等对基片温度分布均匀性有重要影响。

Magnetohydrodynamic equilibrium of plasma ball lightning

Thin foil observations using transmission electron microscopy reveal that the density of dislocations within the band is extremely high and the tangled arrangement of dislocations tends to align along the length of the shear band. The grains in the band were also elongated along the shear band and clearly exhibited a crystallographic nature.

等离子体效应对碳的类氢离子能级的影响

通过在狄拉克方程中考虑德拜-休克尔（Debye-Hückel）屏蔽势，研究了类氢离子C^5＋低能级能量1s（^2S1／2），2s（^2S1／2），2p（^2P1／2和^2P3／2）随等离子体电子温度及电子密度的变化规律，计算得到类氢离子C^5＋能级能量及能级电离势随等离子体环境的变化关系。同时，拟合得到了基于德拜-休克尔屏蔽势下相当好的束缚态能级能量随等离子体环境变化的解析公式，利用该公式得到了类氢离子C^5＋相应各能级发生压致电离的临界电子密度，其结果与其它文献比有很好的可比性。结果表明：束缚态能级能量

中国野青茅属的分类学修订

　　通过野外观察和标本研究，本文分析了中国野青茅属植物主要形态性状的变异式样，对其叶片表皮进行了光镜和电镜观察，对外稃表皮进行了电镜观察，分析了该属植物的生态和地理分布。在此基础上，对中国野青茅属植物进行了分类修订。 1．形态性状分析 分析结果显示：野青茅属植物形态变异极其复杂，性状之间大多缺少相关性，属内有分类价值的性状较为贫乏。一般来说，颖片表面特征、基盘毛与外稃的相对长度、外稃的质地及表皮结构、外稃背部具芒与否、芒的伸出位置等性状在种内较为稳定，是本属首要的分类性状。植株疏丛型或密丛型、花序宽大开展或短小紧缩、小穗的大小等性状在分类上具有第二位的重要性。而叶鞘、叶舌、叶片的长宽、颖片边缘是否具睫毛等性状往往在种内没有稳定性，在分类中应该审慎对待。但是，应该特别指出，即便是通常比较稳定可靠的性状， 在少数类群中也可能存在较为复杂的变异，而那些通常没有稳定性的性状，在个别类群中又可能表现出稳定性，在分类上具有重要的价值。 2．叶表皮 在光镜和扫描电镜下观察了叶表皮结构，结果表明：上表皮结构无规律性可循，难以用来分类;下表皮结构为典型的狐茅型，脉间长细胞、刺毛、硅细胞的形态具有一定的分类学意义。 3．外稃表皮 在扫描电镜下观察了外稃表皮结构，结果表明：所有类群的外稃表皮均由长细胞和刺毛组成，偶见硅细胞而无气孔。根据外稃表皮的结构特征可将本属植物分为4类，第1类：长细胞厚壁，边缘显著波状弯曲，刺毛基部浅表型;第2类：长细胞厚壁，边缘微波状或波状弯曲，刺毛基部浅表型;第3类：长细胞薄壁，边缘波状弯曲，刺毛基部下陷;第4类：长细胞厚壁，边缘微波状或波状弯曲，刺毛基部下陷。 4．生态与地理分布 野青茅属植物分布于南北半球的温带地区以及热带的山区，主要生于较潮湿的环境，如林缘、灌丛、低海拔的湿草甸、高山和亚高山草甸、山坡草地等。该属植物在中国主要分布在西南山区和青藏高原，分布种类在海拔3000-4000米最为丰富。 5．区系地理成分分析 中国野青茅属植物的区系地理成分以中国一喜马拉雅成分、中国特有成分为主体，包括环北极成分、旧世界温带成分、中国一日本成分等共5种。认为中国的西南山区至喜马拉雅一带为野青茅属植物的多样性中心之一。 6．根据标本资料，绘制了每一种在中国的地理分布图，以及大部分种的垂直分布柱状图。并首次提供丁8个种的标本绘图。 在．上述工作的基础上，本文对中国野青茅属进行了分类学修订，归并12种，12变种，其中包括新异名16个;作出新组合2个，其中包括1个改级新组合。本文确认了产于中国的该属植物3 1种，3变种（不包括原变种）;另有8种1变种暂存疑。经本文修订后，原中国植物志记载的43种14变种，目前被确认27种2变种。

酸性抗菌肽及其基因和在制药中的应用

本发明涉及一种酸性抗菌肽及其基因和在制药中的应用，属于生物医学领域。酸性抗菌肽，是中国两栖类动物大蹼铃蟾基因编码的一种单链多肽，分子量2021.4，等电点4.8，多肽氨基酸全序列一级结构为：Ile Leu Gly Pro Val LeuGly Leu Val Ser Asp Thr Leu Asp Asp Val Leu Gly Ile Leu-AMIDATION。编码酸性抗菌肽的基因由632个核苷酸组成，其中编码成熟酸性抗菌肽为第418-477位核苷酸。人工化学合成的酸性抗菌肽具有显著的抑制细菌生长的作用，可以作为制备抗微生物感染疾病药物的应用。

Antimicrobial activity-specific to Gram-negative bacteria and immune modulation-mediated NF-kappa B and Sp1 of a medaka beta-defensin

Defensins are a group of cationic antimicrobial peptides which play an important role in the innate immune system by exerting their antimicrobial activity against pathogens. In this study, we cloned a novel beta-defensin cDNA from medaka (Oryzias latipes) by rapid amplification of cDNA ends (RACE) technique. The full-length cDNA consists of 480 bp, and the open reading frame (CRF) of 189 bp encodes a polypeptide of 63 amino acids (aa) with a predicted molecular weight of 7.44 kDa. Its genomic organization was analyzed, and Southern blot detection confirmed that only one copy of beta-defensin exists in the medaka HNI strain. RT-PCR, Western blot and immunohistochemistry detections showed that the beta-defensin transcript and protein could be detected in eyes, liver, kidney, blood, spleen and gill, and obviously prevalent expression was found in eyes. Antimicrobial activity of the medaka beta-defensin was evaluated, and the antibacterial activity-specific to Gram-negative bacteria was revealed. Furthermore, the lipopolysaccharide (LPS), a major component of the outer membrane of Gram-negative bacteria, was demonstrated to be able to induce about 13-fol up-regulation of the beta-defensin within first 12 h. In addition, promoter and promoter mutagenesis analysis were performed in the medaka beta-defensin. A proximal 100 base pair(bp) sequence (+26 to -73)and the next 1700 bp sequence (-73 to -1755) were demonstrated to be responsible for the basal promoter activity and for the transcription regulation. Three nuclear factor kappa B (NF-kappa B) cis-elements and a Sp1 cis-element were revealed by mutagenesis analysis to exist in the 5' flanking sequence, and they were confirmed to be responsible for the up-regulation of medaka beta-defensin stimulated by LPS. And, the Sp1 cis-element was further revealed to be related to the basal promoter activity, and transcriptional factor II D (TFIID) was found to be in charge of the gene transcription initiation. All the obtained data suggested that the novel medaka beta-defensin should have antimicrobial activity-specific to Gram-negative bacteria, and the antibacterial immune function should be modulated by NF-kappa B and Sp1. (C) 2008 Elsevier Ltd. All rights reserved.

Growth of a novel periodic structure of SiC/AlN multilayers by low pressure chemical vapour deposition

A novel 10-period SiC/AlN multilayered structure with a SiC cap layer is prepared by low pressure chemical vapour deposition (LPCVD). The structure with total film thickness of about 1.45 mu m is deposited on a Si (111) substrate and shows good surface morphology with a smaller rms surface roughness of 5.3 nm. According to the secondary ion mass spectroscopy results, good interface of the 10 period SiC/AlN structure and periodic changes of depth profiles of C, Si, Al, N components are obtained by controlling the growth procedure. The structure exhibits the peak reflectivity close to 30% near the wavelength of 322 nm. To the best of our knowledge, this is the first report of growth of the SiC/AlN periodic structure using the home-made LPCVD system.

P-选择素Lectin结构域变构的模拟预测

<正>粘附分子选择素(selectin)家族成员与其配体间相互作用介导的细胞粘附在炎症级联反应、肿瘤转移和淋巴细胞归巢等病理、生理过程中起重要作用(Bevilacqua and Nelson,1993)。其结构组成从远离细胞表面