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101.
102.
用荧光探剂DPH研究家蝇线粒体膜脂流动性 总被引:1,自引:0,他引:1
曾晓Peng 《中国媒介生物学及控制杂志》1996,7(2):89-94
本文探讨了用DPH作为荧光探剂,研究家蝇飞翔肌线粒体膜脂流动性的方法。实验表明:DPH确是用来研究家蝇生物膜流动性的有效探剂。同时,初步观察了不同杀虫剂对DPH与线粒体膜结合后荧光强度的影响。其中氯菊酯和倍硫磷、马拉硫磷、敌百虫、氧化乐果,可使DPH探剂与线粒体膜结合后的荧光相对强度增加;而氰戊菊酯、氯氰菊酯,溴氰菊酯及辛硫磷、乙酰甲胺磷,则可使荧光强度减弱。 相似文献
103.
链置换式扩增检测羊水中巨细胞病毒DNA 总被引:2,自引:1,他引:1
目的:介绍一种简便快速准确检测羊水中CMV-DNA的改良PCR-链置换式扩增用于诊断胎儿先天感染CMV。方法,将组成套式PCR的外内两对引物按照一定比例(外:内=1:50-100)加在同一试管中一次扩增羊水和胎儿组织中CMV-DNA。结果:90例异常孕产史的孕妇羊水检测CMV-DNA,阳性率为38.9%(35/90),其中合并染色数目异常2例(47,XYY和47,XX,+21)(已引产)核型及染色 相似文献
104.
105.
目的:了解单核细胞流变特性异常在动脉粥样硬化进程的作用。方法:大耳白兔60只随机分为实验组(AG)40只及对照组(CG)20只,AG给予胆固醇lg.d^-1只^-1在喟养的第2,4,8和12周分别抽血检测单核细胞变形性,膜脂流动性及单核细胞(Ca^2+0i。结果:在兔AS阶段性进程中,单核细胞变形性,膜脂流动性下降趋势,细胞内(Ca^2+)i呈上升趋势,膜流动性与细胞内(Ca^2+)i呈负相关,变 相似文献
106.
Jeffrey H. Ware Angela J. Dibenedetto Randall N. Pittman 《Brain research bulletin》1995,37(3):275-281
The distribution of tissue plasminogen activator (tPA) messenger RNA in rat brain was studied using in situ hybridization with 35S UTP-labeled RNA probes derived from a fulllength tPA cDNA. Sense strand controls produced low, even backgrounds, with small elevations in the hippocampus. Full-length antisense probes produced strong signals over cerebral ventricular ependyma (including ependyma of the subcommissural organ), meninges, blood vessels, and Purkinje cell layer of the cerebellum, as well as strong signals over scattered cells throughout the brain. Some of these scattered labeled cells were large with lightly stained nuclei, while others were small with darkly stained nuclei. The large labeled cells, which were probably neurons, constituted 8% and 8% of cells in the brain stem and neocortex, respectively, and 100% of Purkinje cells. The small cells, which were present in all areas of the brain, constituted 3–11 % of cells in individual brain areas. 相似文献
107.
聚合酶链反应诊断单纯疱疹病毒性脑炎 总被引:5,自引:0,他引:5
用聚合酶链反应(PCR)扩增患者脑脊液(ChF)中病毒特异性DNA可早期快速诊断单纯疱疹病毒性脑炎(HSE)。19例临床确诊的病毒性脑炎患者,经PCR在CSF中检出单纯疱疹病毒(HSV)13例,全部阳性标本均经分子杂交证实为HSV-DNA,而14例其他神经疾病(OND)对照组均为阴性,显示了这一方法的特异性。其中7例病毒性脑炎CSF标本分别用PCR分子杂交和病毒分离等三种方法检测HSV;显示PCR最为敏感。表明PCR技术的广泛应用将提高HSE的早期诊断水平,指导临床正确治疗。 相似文献
108.
P. Apostoli L. Romeo M. C. De Matteis M. Menegazzi G. Faggionato L. Vettore 《International archives of occupational and environmental health》1988,61(1-2):71-75
Summary The effects of lead on red blood cell (RBC) membrane proteins were studied in two groups of workers with different lead exposure levels: Group 1 (6 subjects employed in a battery plant) with a mean blood lead of 40.1 (SD = 3.7) g/100 ml; Group II(5 workers employed in different industries) with a mean blood lead of 60.6 (SD = 8.0) g/100 ml, compared with a control group with mean blood lead of 15.6 (SD = 9.3) g/100 ml. The analysis of RBC membrane polypeptides was carried out by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), and by using a densitometer for percentage measurement of the bands corresponding to protein fractions. The results show a very significant decrease in Band 3 (anion channel) and 4.1 in more exposed workers (Group II) only. The effects of lead on RBC membrane proteins seem to be evident at blood-lead levels higher (> 50 g/100 ml) than those previously reported in literature. These results confirm the effects of lead on membrane proteins, even if the exact mechanism, particularly the influence of proteolysis and the meaning of the interference, still needs to be investigated thoroughly. 相似文献
109.
A "reverse" hybridization method is described, in which whole chromosomal DNA was extracted from 10-20 colonies of "unknown" strains in pure culture and labelled with digoxigenin by a random primer technique. DNA probes were prepared from a total of 23 strains and hybridized with targets containing 100 ng purified, denatured DNA from 38 reference strains fixed to nitrocellulose. 21/23 digoxigenin-labelled DNA probes successfully detected all members of the homologous species present on filters. Probes to Fusobacterium nucleatum strains 364 and MG detected 3/4 and 1/4 members of this species, respectively; 13/23 probes were 100% specific, but cross reactions between 10 probes and DNA targets from closely related, heterologous species occurred in 15/834 possible instances. False-positive reactions that occurred between closely related species were, however, easily distinguished and did not prevent the accurate identification of probe strains. Digoxigenin-labelled probes were capable of detecting 100 pg of homologous DNA. The reverse hybridization procedure allows identification or grouping of a large number of isolates within 3 days and provides a more economical means of characterizing subgingival isolates than predominant cultivable techniques and conventional phenotypic testing. This method could be adapted for the direct identification of microorganisms in subgingival plaque samples. 相似文献
110.
Michael?N.?Romanov Laura?M.?Daniels Jerry?B.?Dodgson Mary?E.?DelanyEmail author 《Chromosome research》2005,13(2):215-222
The chicken genome, like those of most avian species, contains numerous microchromosomes that cannot be distinguished by size
alone. Unique properties attributed to the microchromosomes include high GC content and gene density, and an enhanced recombination
rate. Previously, microchromosome GGA 17 was shown to align with the consensus genetic linkage group E41W17, and bacterial
artificial chromosome (BAC) clones containing E41W17 markers were isolated and assigned on the physical BAC map as well as
the recently assembled draft chicken genome sequence. For this study, these same BACS were utilized as probes for fluorescence
in-situ hybridization (FISH) to develop the GGA 17 cytogenetic map. Here we detail the chromosome order of ten BAC DNAs, thereby
deriving a cytogenetic map of GGA 17 that is simultaneously integrated with both the linkage map and genome sequence. The
location of the FISH probes together with the morphological appearance of the chromosome suggested that GGA 17 is an acrocentric
chromosome whose cytogenetic map orientation is reversed from that currently indicated by the linkage map and draft genome
sequence. The reversed orientation and the centromere location of GGA 17 were confirmed experimentally by dual-colour FISH
hybridization using terminal BACs and the centromere-specific CNM oligonucleotide as probes. An advantage of this cyto-genomic
approach is the improved alignment of the sequence and linkage maps with cytogenetic features such as the centromere, telomeres,
p and q arms, and staining patterns indicating GC versus AT content. 相似文献