181 resultados para 343.0146


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Antigen-specific circulating immunoglobulin-secreting cells (ISC) migrate to various secondary and tertiary lymphoid tissues. To understand the migration of the cells into the genital tract and its regulation by sex hormones, spleen-derived SG2 hybridoma cells secreting immunoglobulin G2b (IgG2b) and Peyer's patch-derived PA4 hybridoma cells secreting polymer IgA were labelled with (3) H-TdR, and intravenously injected into syngeneic mice of both sexes. Using flow cytometry, surface molecular markers of plasma cells, CD38 and CD138, and adhesion molecules, CD49d, CD162, and CD11a were found to be positive in SG2 and PA4 cells, but CD62L, alpha4beta7 and CD44 were not expressed on these cells. The relative distribution indexes (RDIs) of the cells in genital tract and other tissues were measured. The means of RDIs of SG2 and PA4 cells in female genital tissues were 6.5 and 4.5 times as many as the means in male genital tissues, respectively. The treatment of ovariectomized mice with beta-oestradiol significantly increased the RDIs of PA4 cells in cervix and vagina, but decreased the RDIs of SG2 cells in vagina, horn of uterus, uterus and rectum (P <0.05). Progesterone treatment increased the RDIs of PA4 cells in vagina and rectum (P <0.05). The treatment with testosterone significantly increased the RDIs of SG2 and PA4 cells in epididymis and accessory sex glands (P <0.05). These results demonstrate that the female genital tract is the preferable site for the migration of circulating hybridoma cells to the male genital tract, and sex hormones play an important role in regulation of the migration of circulating ISC to genital tracts.

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报道了寄生于黄颡鱼(Pelteobagrus fulvidraco)胃、肠中的黄颡前驼形线虫(Procamallanus fulvidraconis)的成熟和感染丰度的季节动态。从2001年2月到2002年7月的18个月中,对来自于湖北省梁子湖的900尾黄颡鱼进行了调查,结果表明:该线虫的感染率除在2002年1月比较低(32%)外,其他月份都在90%以上,且没有显著的季节性变化(G=16.96F0.01[17,882]=1.98)。在对黄颡前驼形线虫雌虫成虫的三个阶段(成熟期、怀卵期和怀幼期)和雄虫成虫的

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采用RT-PCR方法,从稀有鮈鲫肌肉组织中分离和克隆出β-肌动蛋白基因cDNA部分序列,长度为1 029 bp,编码343个氨基酸残基.序列分析表明,该cDNA序列与其他物种β-肌动蛋白基因同源性非常高.RT-PCR能够检出该基因在稀有鮈鲫肌肉、眼、脑、心脏、肝、肠、鳃、睥、卵巢等组织中广普表达,在胚胎不同发育时期持续恒量表达.并基于已知的鱼类β-肌动蛋白基因序列构建了进化树.

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实验比较了丰鲤与奥尼罗非鱼摄食低质和高质两种等能饲料时的氮收支和能量收支。低质饲料的蛋白质含量为 34.2 5 %、蛋白质主要来源为豆粕 ,高质饲料的蛋白质含量为 4 5 .4 4 %、蛋白质主要来源为鱼粉。 5 3d的生长结果显示 :摄食低质饲料时 ,奥尼罗非鱼通过降低排泄氮、排泄能和代谢能的比例 ,使生长氮和生长能的比例显著高于丰鲤 ,摄食高质饲料时 ,则通过降低粪氮和粪能的比例取得快速生长的效果 ;丰鲤生长氮和生长能比例不受饲料质量的显著影响 ,但高质饲料使排泄氮和代谢能比例显著降低 ;奥尼罗非鱼的

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将野生和人工繁殖的草鱼仔鱼的耳石取出并置于显微镜下观察微结构特征。结果表明 :草鱼耳石一般有一个圆形或卵圆形的原基和中心核 ,但有 0 4 1%~ 4 6 7%的样本具有双原基或双中心核。343尾野生仔鱼中 ,6 71%的个体在矢耳石和微耳石上具有营养转换标记 ,而 187尾人工繁殖的仔鱼中 ,在矢耳石和微耳石上出现营养转换标记的比例分别是 6 4 17%和 5 0 80 % ;在营养转换标记处 ,矢耳石和微耳石的直径分别为 5 4 12±9 4 9μm和 4 0 4 8± 7 0 2 μm (n =5

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用抑制性差减杂交结合SMART cDNA合成和RACE-PCR技术的综合方法,从鱼类卵母细胞卵黄形成后期差减文库中克隆到一个新的含WD结构域蛋白的基因.该基因CDNA全长为1870 bp,可读框长990 bp,编码的蛋白质由329个氨基酸组成,含有6个WD结构域;5’非编码区长 210 bp,3’非编码区长 670 bp,有脊椎动物典型的ANNATG起始序列和polyA加尾信号AATAAA.由于其编码的蛋白质与STRAP蛋白(serine-threonine kinase receptor-associa

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运用经典血清学方法首次在红鯽中证明了一种与金枪鱼中的A-B-O血型及人类的ABO血型模式相似的红细胞抗原系统,命名为S血型系统。该系统有四种血型表型:S~1,S~2,S~2S~2和S~0,推测它由S~1、S~2和S~0三个复等位基因决定。

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于1981年,以经过γ射线或紫外线处理的近类精子作为激活源,成功地诱发兴国红鲤(cyprinus carpio)卵子的雌核发育。经两代连续雌核发育的部分后代个体进行人工转性,使之成为“生理雄性”,并以“生理雄性”个体与其同胞姐妹交配所产后代为遗传特性纯一的个体——红鲤8305。检查了LDH,EST,MDH,SOD,IDH及运铁蛋白(transferrin)的座位,发现同一个系的不同个体之间等位基因没有差别,而且各座位的等位基因都是纯合的。血清学试验表明,控制红鲤8305雌核发育系的红细胞表面抗原的基因纯合

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以草鱼(Ctenopharyngodon idellus)为母本、鲤(Cyprinus carpio)为父本进行人工杂交,杂种胚胎发育至孵化期全部死亡;同时获得了少数雌核发育草鱼和雄核发育的鲤。分析比较了草鲤杂种胚胎染色体变化及胚胎发育情况。发现杂种胚胎染色体数目变化较大,一般在24—73之间,绝大部分细胞染色体在发育过程中不断丢失而出现非整倍体;极少数细胞在受精后雌性原核和雄性原核不结合而引起雌核发育和雄核发育;草鱼和鲤胚胎发育时序有较大差别;因此细胞分裂不能同步。可能是杂种胚胎染色体不断丢失的主要原因

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本项研究工作表明,塔式生物滤池在处理模拟洗涤剂工业废水时,能够适应和克服一般好氧生化法所不能解决的泡沫问题,并对废水中的LAS和COD具有一定的去除效果。根据实验结果,初步认为塔滤可应用于洗涤剂工业废水的生化处理,并向洗涤剂行业首次推荐这种废水生物学净化方法。从塔滤的生物膜中分离出了优势菌,经鉴定为一种气单胞菌(Aeromonas sp.D-4)。