适于蚁蚕的基因组DNA提取方法

昆虫基因组DNA提取是对昆虫在分子水平上进行研究的关键,提取的DNA的纯度、浓度及完整性是进行基因工程各项研究所必须的条件。本研究主要对应用4种方法,以柞蚕蚁蚕时期组织材料为样品提取DNA后进行比较分析。结果发现,利用BIOMIGA试剂盒,置于36℃条件,经50μL蛋白酶K 70℃消化6h后,5μLRNase A酶37℃消化10min,提取的DNA质量较好。且样品易于保存,保存时间长,提取时间短的优点,对提高柞蚕研究效率具有实用价值。     

绿蝇基因组DNA提取方法比较研究

通过3种基因组DNA提取方法的试验比较,寻找一种提取效果最好的绿蝇基因组DNA提取方法.经DNA浓度检测与电泳结果分析表明,Collines法的提取效果最好,可应用于绿蝇的基因组DNA提取.     

从猪血中提取高质量基因组DNA的研究

经研究改进 ,建立了一种从猪血中提取高纯度全基因组DNA的有效方法。经 2 %琼脂糖凝胶电泳检测 ,DNA带型整齐集中 ,无拖尾现象 ,证明DNA分子片段完整 ,没有降解。紫外分光光度计检测 ,DNA的OD2 60 /OD2 80 达 1.75± 0 .0 5 ,证明所提DNA质量较好 ,用于PCR扩增 ,可以得到满意的扩增效果 ,且避免了用苯酚等剧毒试剂 ,是一种理想的DNA提取法     

番鸭全血基因组DNA的提取与克隆

以柠檬酸葡萄糖溶液(ACD)抗凝的番鸭全血为材料,采用酚/氯仿抽提法和试剂盒法提取基因组DNA,并对基因组DNA进行PCR扩增、克隆并测序。结果表明,提取的基因组DNA纯度高,用琼脂糖凝胶电泳检测基因组DNA,主带清晰、无拖尾现象,无污染;通过PCR扩增有特异性条带出现,测序结果显示番鸭基因组DNA片段大小为868bp,与预期结果大小一致。     

六种试剂盒提取血液基因组DNA效果比较

为筛选一种高效、快捷的血液基因组DNA提取试剂盒,采集24份新鲜西藏绵羊血液样本,选用6种市售商业化试剂盒（LifeFeng柱式试剂盒DK601和非柱式试剂盒DK602,康为世纪非柱式试剂盒CW0544和柱式试剂盒CW0546,上海生工非柱式试剂盒SK8224和柱式试剂盒SK8254）,比较所提DNA的浓度、纯度、得率以及对嗜吞噬细胞无形体16S rRNA进行巢式PCR扩增,综合评价不同试剂盒DNA提取效果.结果表明,应用LifeFeng柱式试剂盒DK601提取的DNA浓度和纯度均最高,得率较高,分别达到75.63 ng/μL、1.894（OD260/OD280）、18.91 ng/μL;且嗜吞噬细胞无形体16S rRNA基因的PCR扩增条带清晰度最优.因此,LifeFeng DK601可作为提取绵羊血液基因组DNA及嗜吞噬细胞无形体（Anaplasma phagocytophilum）病原鉴定的首选试剂盒.     

牛血凝块基因组DNA提取方法的建立

建立了一种牛血凝块基因组DNA提取方法，其过程为机械性粉碎，高盐EDTA处理后用含蛋白酶K和SDS的细胞裂解液消化，苯酚-氯仿抽提，再以本方法抽提的DNA为模板进行PCR扩增，对PCR产物测序，测序结果与抗凝血DNA的PCR产物测序结果比较。结果表明：本方法提取的DNA成功地应用于PCR扩增。     

两种桑树基因组DNA提取方法的比较研究

以8份广西桑树种质资源为材料,比较了改良的CTAB法和植物基因组DNA试剂盒法(离心柱)提取桑树基因组DNA的效果.结果表明:两种方法都能得到桑树样品清晰的DNA电泳条带,DNA纯度高,改良的CTAB法提取的DNA浓度在308.70μg/mL～384.30μg/mL之间,平均值是331.45μg/mL;植物基因组DNA...     

斑马鱼基因组DNA提取方法在蜜蜂上的尝试

基因组DNA的提取是分子生物学研究中不可缺少的一项内容.随着蜜蜂分子生物学的发展,快速高效地提取适合于实验操作的蜜蜂基因组DNA成为各项研究的基础.介绍了一种简便快速提取蜜蜂基因组DNA的方法,可满足基本的分子生物学实验要求.     

绵羊瘤胃微生物基因组DNA提取方法的探讨

本研究针对瘤胃内容物成分复杂、微生物种类繁多,且难于培养和分离这一特点,本着为采用免培养技术研究瘤胃微生物提供前期样本这一目的,对现在常用的五种基因组DNA提取方法进行了比较。试验结果得出应用珠磨-SDS/CTAB/PVP法所提瘤胃微生物基因组DNA质量及纯度较好,总DNA长度大于20kb,OD260/OD280在1.7以上。同时对所提的DNA应用PCR方法进行了检测,可以成功扩增出瘤胃中的古细菌、真细菌和真菌16/18SrDNA片断,进一步证明了此方法的优越性及可行性,为后续一些分子生物学试验提供质量较高的DNA模板。     

玉米基因组DNA的快速高效提取(简报)

采用改良的十六烷基三乙基溴化铵(CTAB)法,以玉米Zea mays的黄化苗叶片为材料提取玉米基因组DNA,提取的DNA经0．8％的琼脂糖凝胶电泳检测,结果表明,此法具有快速、高效和DNA质量好、纯度高等优点。     

Isolation and culture of parenchymal and nonparenchymal cells from neonatal swine liver

Procedures for the isolation and monolayer culture of hepatocytes and nonparenchymal (Kupffer and endothelial) cells from livers of neonatal pigs (1 to 15 d of age) are described. Cell suspensions were obtained by a modification of the two-step collagenase perfusion technique. Hepatocytes were collected by low-speed centrifugation and nonparenchymal cell populations were purified by centrifugal elutriation. Hepatocytes were readily maintained in arginine-free medium fortified with either fetal calf serum or bovine serum albumin and oleate for periods as long as 6 d. The ability of cultured hepatocytes to incorporate 3H-leucine and 3H-thymidine into protein and DNA, respectively, demonstrated that cells were metabolically active for at least 3 d in culture. The 3H-leucine incorporation into total cell protein was constant regardless of animal age at the time of cell isolation, while incorporation of 3H-thymidine was influenced by animal age. Incorporation of both precursors was dependent upon duration of culture period in vitro and the type of medium (serum-free vs serum-containing) in which the cells were maintained. Morphological observation and analysis of the DNA and protein levels of hepatocyte monolayers suggest that cells did not replicate during the 3-d incubation period. The ability to isolate and culture metabolically active, nonreplicating hepatocytes from neonatal pigs in a serum-free medium affords opportunities for investigation of the influence of specific hormones and specific growth factors on the uptake and metabolism of nutrients by the liver. Similarly, the neonatal pig will serve as a useful model for the characterization of hepatic nonparenchymal cell metabolism during the neonatal period.     

猪链球菌的分离与鉴定

文章对分离的4株猪源链球菌进行了鉴定，其形态，染色、培养及生化特性均符合链球菌的特点。用链球菌乳胶分型诊断液检潮上述分离株，均不在其检测范围，即不属于链球菌兰氏分群的A-G群，但它们凝集猪链球菌2型抗血清。分离株对小鼠不致病，而对家兔则可致病。     

Expression and purification of recombinant swine interleukin-4

The swine interleukin-4 (SwIL-4) cDNA was cloned by RT-PCR. It was expressed using an expression vector pQE30 in E. coli, a baculovirus AcNPV vector pVL1392 in insect cells, and a pCAGGS vector in mammalian cells. The rSwIL-4 proteins expressed from bacteria and insect cells were purified using a chelating affinity column and a mAb-coupled immunoaffinity column. The amount of the products and their bioactivities were compared. All recombinant cytokines were efficiently reacted with the specific antibodies and the molecular weight of rSwIL-4 was approximately 16 kDa in E. coli, 15 and 18 kDa in insect cells, and 15 and 20 kDa in mammalian cells. Variations of molecular weight observed in insect and mammalian cells were probably due to different modification ways of glycosylation. All these recombinant proteins retained their antigenicity and were biologically active in inducing human TF-1 cell proliferation in vitro. The simple purification method will make it possible to evaluate the in vitro and in vivo effects of IL-4 in pigs.     

猪流感病毒的分离鉴定及特性测定

猪流感(SI)是由猪流感病毒(SIV)引起的猪的一种呼吸道传染病,目前我国主要流行H 1和H 3亚型[2],H 9N 2等亚型也见报道[3]。该病是一种免疫抑制病[1],感染后会抑制其他疫苗的免疫效果,易导致其他病原体混合感染,给养殖业造成巨大的经济损失。由于流感病毒基因组易发生变异,猪又是产生重组病毒的“混合器”,如20世纪90年代在意大利猪体内就发现了禽与人流感病毒重组体[4],如果产生一种可以在人群中传播的新型流感病毒,将造成极大危害,故及时掌握猪流感流行情况及进行有效的防制,具有重要的兽医流行病学和公共卫生学意义。本试验旨在对河北…     

Isolation of Mycoplasma salivarium from swine

Mycoplasma salivarium, a common human oropharyngeal mycoplasma, was isolated from nasal and pharyngeal secretions of 14 of 284 swine in a barrier-maintained, disease-free herd. M. salivarium was recovered from one boar 6 times over a 26-month period and one time only from 13 other swine. Human isolates of M. salivarium were compared with the swine isolates by DNA-DNA hybridization and SDS-PAGE of the cell proteins and the strains were shown to be closely related. One of eight of the swine from which M. salivarium was isolated had complement-fixing antibodies and another culture-positive animal had metabolic-inhibiting antibodies to M. salivarium. Overt disease was not associated with the organism. These results support previous findings that mycoplasmas closely related to M. salivarium may be isolated from the nasopharynges of swine and they further indicate that the organism can establish persistently in swine without evidence of overt disease.     

猪伪狂犬病病毒的分离与鉴定

猪伪狂犬病是由疱疹病毒科的猪疱疹病毒1型病毒引起的一种急性传染病，多数动物均可感染，猪是本病的主要宿主和带毒者。本病主要以成年妊娠母猪流产、死产、木乃伊胎、新生仔猪急性死亡及3周龄以内的仔猪表现神经症状为主要特征。近年来我国也相继有本病发生的报道。1997年10月黑龙江省牡丹江地区某养猪场从外地引进种母猪，回来后直接放入后备猪舍与其他后备母猪混养，5日后同舍母猪出现厌食、发热、精神沉郁，有的呕吐、咳嗽。     

鸡精原细胞分离与纯化初探

采用二酶三步消化法处理鸡睾丸组织,获得的细胞悬液以Percoll作为介质并结合细胞选择性贴壁培养纯化精原细胞。结果发现：1mg/mL胶原酶 0．25％胰蛋白酶 0．25％胰蛋白酶处理鸡睾丸组织,获得的细胞总数多达5．8×10~6个；Percoll离心后精原细胞主要位于19％～35％梯度层中,纯度平均达到66．4％；贴壁纯化后精原细胞纯度则达到82％,比未经贴壁纯化的精原细胞纯度高15．6％。