2W Yb-doped double-clad fiber superfluorescent source with 42 nm 3 dB bandwidth

The output spectrum of Yb-doped double-clad fiber superfluorescent source (SFS) is tailored by placing a broadband dichroic mirror in the pump end of conventional single-pass forward configuration, which constitutes double-pass forward configuration. The 3 dB bandwidth is increased from I I to 42 nm. A maximum output SFS power of 2.12 W and a slope efficiency of 43.2% are obtained. The double-clad fiber is 25 in and the pump power is adequate to saturate the fiber as far as the feedback-induced lasing appears. (c) 2004 Elsevier Ltd. All rights reserved.

精神分裂症易感基因GULP1与中国人群大脑容量的相关性研究

精神分裂症是一种复杂的精神疾病,全世界约有1%的人患有这种疾病.以往的研究发现精神分裂症患者的脑容量比正常人小,且一些精神分裂症易感的DNA序列多态性也同时与脑的结构异常有关,这与精神分裂症的神经发育假说是吻合的.最近研究发现人的GULP1基因的两个SNP(rs2004888和rs4522565)与精神分裂症显著相关.为了研究这两个精神分裂症易感的SNP是否也符合神绎发育假说,我们检测了791个正常人的这两个SNP的基因型并测量它们的脑容量,相关性分析发现这两个SNP和脑容量无关,说明GULP1的精神分裂症易感性存在更加复杂的机制.

Vespid chemotactic peptide precursor from the wasp, Vespa magnifica (Smith)

Despite the evolutional distance between wasp and amphibian, vespid chemotactic peptide (VCP), an important component of wasp venom, are found sharing remarkable similarities with the temporin antimicrobial peptides (AMPs) from Ranid frog, Amolops loloens

一个先天性小眼球家系致病基因的排除性定位

先天性小眼球是一种先天发育异常性眼科疾病.通过基因扫描和连锁分析对一个6代常染色体显性遗传先天性小眼球中国家系的疾病相关基因进行研究.根据已报道的与小眼球相关的5个基因座位(MITF,SOX2,PAX6,MCOP和NNO2),在3,11,14和15号染色体上选取了14个微卫星标记,以荧光标记引物的聚合酶链反应(PCR)扩增目的片段,用ABI 377 DNA遗传分析仪对该家系成员进行基因扫描和基因分型,并采用Linkage软件包对基因分型结果进行连锁分析.结果显示,该家系致病基因与这些已报道的座位均不连锁,即该家系致病基因不是已报道的座位,可能是一个尚未报道的对眼球发育至关重要的新基因座位.

Evidence of gene conversion in the evolutionary process of the codon 41/42 (-CTTT) mutation causing beta-thalassemia in southern China

The 4-bp deletion (-CTTT) at codon 41/42 (CD41/42) of the human beta-globin gene represents one of the most common beta-thalassemia mutations in East Asia and Southeast Asia, which is historically afflicted with endemic malaria, thus hypothetically evolvi

Secondary structural analysis of the mRNA regions encoding the hemagglutinin cleavage site basic amino acids of the avian influenza virus H5N1 subtype samples

Here we report the codon bias and the mRNA secondary structural features of the hemagglutinin (HA) cleavage site basic amino acid regions of avian influenza virus H5N1 subtypes. We have developed a dynamic extended folding strategy to predict RNA secondar

SEROLOGICAL SURVEY OF A CAPTIVE MACAQUE COLONY IN CHINA FOR ANTIBODIES TO SIMIAN TYPE-D RETROVIRUSES

Sera from 510 macaques consisting of Macaca mulatta, Macaca assamensis, Macaca fascicularis, Macaca nemestrina, and Macaca arctoides were investigated for antibodies to simian AIDS type D retrovirus (SRV) by ELISA and Western blot with viral antigens purified from supernatants of SRV-1 infected cell cultures. Of these monkeys, 104 were seropositive by ELISA; only 23 were confirmed by Western blot. The true positive reaction to SRV was found in 15 of 463 (3.2%) M. mulatta and eight of eleven (72.7%) M. assamensis.

Phylogeny of Muntiacus (Cervidae) based on mitochondrial DNA restriction maps

Mitochondrial DNA restriction maps for 12 restriction enzymes of four species of muntjacs-Indian muntjac (M. muntjak), Gongshan muntjac (M. gongshanensis), black muntjac (M. crinifrons), and Chinese muntjac (M. reevesi)-were compared to estimate the phylogenetic relationships among them. Phylogenetic trees were constructed by both distance and parsimony methods. The two resulting trees share a similar topology, which indicates that the black muntjac and the Gongshan muntjac are closely related, followed by the Chinese muntjac; the Indian muntjac is the sister taxon to all the other muntjacs.

Phylogenetic and systematic study of the genus Bombina (Amphibia : Anura : Bombinatoridae): New insights from molecular data

Phylogenetic relationships and systematics of the eight currently recognized species of the genus Bombina were investigated using four mitochondrial gene fragments (16S rRNA, 12S rRNA, ND4-tRNA(LEU), and cytochrome b). We prepared two different concatenat

南盘江水系三种高原鳅的分化(鲤形目:鳅科)

南盘江是高原鳅属鱼分布的南缘地带,目前发现有3种,其中有2个是新种:抚 仙高原鳅T. fuxianensis sp. nov.和湖高原鳅T. lacustris sp. nov.。它们分 别生活于河道或湖泊中。生活环境的差异导致了它们的分化。形态的分化主要 表现在臀鳍和尾鳍分枝鳍条的数目以及体高、头长、尾柄等 与有关部分的比值, 须的发达程度,骨质鳔囊的形态构造,肛 门的位置和身体斑级纹方面。对2新种 与各自的近似种作了比较。附种的检索表。图4表1参7

中国“四须ba”类的系统整理

四须ba属是一个“大口袋”类群。中国的四须ba实际上分属于至少4个不同的属。通过与Rainboth的分类系统比对之后,对中国四须ba属鱼类的分类系统重新进行了以下的修订:(1)保山四须ba、软鳍四须ba和异口四须ba归入新光唇鱼属;(2)小四须ba归入盘齿ba属;(3)分布于云南的高体四须ba实为大鳞四须ba,大鳞四须ba应归入高须鱼属;(4)其余四须ba属鱼类,抚仙四须ba、常氏四须ba、太平四须#[183]ba、云南四须ba、颌突四须ba(=洱海四须ba)、鲂形四须ba、棱四须ba、后鳍四须ba和油四须ba均归入吻孔ba属。