Objective:To construct the recombinant nonstructural P_2C plasmid in coxsackie B4 virus.Methods:Using the RT-PCR,we fishing the nonstructural protein P_2C cDNA fraction from Coxsackie B4 virus(CVB4) and cloning into the PUCm-T vector, then transfer it into E.coli to construct the recombinant plasmid.Results:Using the total RNA of Coxsackie B4 virus as model, we amplied 987 bp fraction and cloned into PUCm-T vector identifying with BamH Ⅰ and Hind Ⅲ double enzyme.Its products were consistent with nonstructural protein P_2C PCR productions.Conclusion:The recombinant nonstructural P_2C plasmid was constructed succesfully in coxsackie B4 virus.

Objective To evaluate the quality of BAC clones for CGH microarrays in the detection of tumors.(Methods Chromosome) preparations were made from peripheral blood of the healthy volunteers in the conventional manner.The locations of BAC(RPCI-11 library and CTC library) within the region of interest were compiled from information archived by the UCSC and the NCBI.Probes were labeled by nick-translation with biotin-16-dUTP or digoxigenin-11-dUTP.Precise localization of each BAC was confirmed using normal metaphase chromosomes by FISH technique.The copy number and molecular organization of the region of 223 BAC clones which were crucial in the development and progression of human cancers were investigated.Results The FISH analysis indicated the normal BAC clones accounted for 81.62% of the total(186/223);the abnormal clones with additional FISH noises accounted for 13.45%(30/223);those with wrong localization pattern was 3.58%(8/223),and those with no bacterial growth was 1.35%(3/223),respectively.Conclusion FISH technique is effective and useful in the identification of BAC clones for array CGH.

0. 05) while UDS was induced by Polygala tenyi folia willd with various doses comparing with normal control. Nevertheless, Polygala tenyi folia willd in doses ranged from 1. 0 to 4. 0 g ? kg-1 inhibited strikingly UDS induced by Pb (CH3COO)2 (P

Objective To study the effects of formaldehyde on the level of microelements in mouse liver and blood and explore the microelements as biomarker in injury induced by formaldehyde.Methods The mice were randomly divided into control,low(1/40LD50),moderate(1/20LD50) and high(1/10LD50) dose groups exposed to formaldehyde by inhalation(n=20),two hours per day for three and six weeks,and than the contents of Cu,Fe,Zn and Mn in mouse liver and blood were measured.Results The contents of Fe,Zn and Mn in liver in high dose group three weeks after exposure and the contents of Fe and Zn in liver in high dose group six weeks after exposure were significantly lower than those in control group(P

OBJECTIVETo study the effect of Percoll selection technique on normal morphology and acrosin activity of human spermatoza.

METHODSThe sperm morphology and sperm acrosin activity were analyzed by automated sperm morphology analyzer(ASMA) and spectrocolorimetry.

RESULTSThe normal morphology sperm rate and acrosin activity were significantly increased after Percoll selection technique (P < 0.001).

CONCLUSIONPercoll selection technique could affect normal morphology sperm ratio and acrosin activity.

Acrosin ; metabolism ; Adult ; Centrifugation, Density Gradient ; Fertilization in Vitro ; Humans ; Male ; Spermatozoa ; cytology ; enzymology