Chromosome Banding ; Colorectal Neoplasms ; genetics ; Comparative Genomic Hybridization ; methods ; standards ; DNA Probes ; DNA, Neoplasm ; genetics ; Humans ; Karyotyping ; Quality Control ; Reproducibility of Results

Animals ; Central Nervous System ; radiation effects ; Humans ; Mice ; Microwaves ; Rats

Acute Disease ; Adolescent ; Adult ; Aged ; Child ; Child, Preschool ; China ; Humans ; Infant ; Inpatients ; Insecticides ; poisoning ; Middle Aged ; Organophosphorus Compounds ; Pesticides ; poisoning ; Poisoning ; etiology ; mortality ; therapy ; Risk Factors ; Survival Rate

Objective To analyse the causes of perinatal death and explore the preventive measures to reduce the perinatal mortality.Methods The cases with perinatal death in this hospital from January 2005 to December 2006 were reviewed to analyse the causes of death by categorization and sum-up.Results There were 166 cases with perinatal death and the mortality rate was 27.08‰,including 126 cases with fatal death,which accounted for 75.90%.In the analysis of dead causes,the first one was birth defects,which suffered 69 cases,41.57% of all,and mostly were with fetus edema syndrome.The cord factors had been elevated to the second cause,which suffered 51 cases,30.72% of all.Conclusion Improving the consciousness of gestational monitoring and self-care,strengthening the prenatal diagnosis and genetic counseling,controlling the perinatal birth defects,monitoring mother and fetus by poly-parameter and stopping the pregnancy in time can reduce perinatal death effectively.

Objective To evaluate a new system,Vitek 2 Compact,for identification of bacteria and yeasts.Methods 185 clinical isolates of Peking Union Medical College Hospital,including 69 gram- positive strains,66 gram-negative strains and 50 yeasts,and 50 reference strains in our laboratory,including 25 gram-positive and gram-negative strains respectively,were studied.All the strains were identified by Vitek 2 Compact with GP,GN or YST identification cards.The API method was used as the reference method.Results Among the 93 gram-positive strains,85 strains(91.40%)were correctly identified, including 5 low discrimination identified strains,and 8 strains(8.60%)were correctly identified to the genus level,but misidentified to the species level.About 90% of gram-positive strains were identified within 7 h.Out of 91 gram-negative strains,90 strains(98.90%)were correctly identified,with 5 low discrimination identified strains,only 1 strain(1.1%)was correctly identified to the genus level,but misidentified to the species level.Above 90% of Enterobacteriaceae were identified within 5 h,and over 90% of nonfermenting bacteria were identified within 10 h.In the 50 strains of yeasts,46 strains(92%) were correctly identified,including 8 low discrimination identified strains,and 4 strains(8%)were correctly identified to the genus level,but misidentified to the species level.In all the yeasts,45 strains (90%)were identified in 18.25 h,and another 5 strains(10%)were identified in 18.50 h.Conclusions As Vitek 2 Compact system can give us reliable identification results of clinically relevant bacteria and yeasts,together with its significant reduction of handling time,it will definitely become a powerful tool in clinical microbiology laboratory.

Objective To evaluate a new system,Vitek 2 Compact,for antimicrobial susceptibility testing(AST)of gram-negative and gram-positive bacteria.Methods Eighty-nine clinical isolates of Peking Union Medical College Hospital,including 48 gram-negative strains and 41 gram-positive strains,and 66 reference strains kept in our laboratory,including 41 gram-negative strains and 25 gram-positive strains, were studied.The antimicrobial susceptibility of these strains were tested by Vitek 2 Compact with AST- GN09(for gram-negative bacteria),AST-P536(for Staphylococci),AST-P534(for Enterococci and S.agalactiae),and AST-P533(for S.pneumoniae)susceptibility cards.The Etest was used as the reference method for comparision.Thirty-two ESBL-producing strains assessed with the confirmatory tests for ESBLs of CLSI(16 strains of them had been confirmed by PCR amplified and sequencing)were detected for ESBLs by Vitek 2 Compact.Results According to the breakpoints of Clinical and Laboratory Standards Institute (CLSI),for the 1 626 microorganism-antibiotic combinations,Vitek 2 Compact gave 90.83% strains with category agreement(CA),4.91% strains with very major errors(VME),2.09% strains with major errors (ME),6.40% minor errors(MIE).The AST for more than 90% of Enterobacteriaceae,nonfermenting bacteria,micrococci and streptococci were completed within 11h,13h,11h and 12h,respectively.The ESBLs tests for thirty-two strains by V-itek 2 Compact are all positive.Conclusions Vitek 2 Compact system can give rapid,reliable and reproducible result with high sensitivity and specificity in assessment of antimicrobial susceptibility testing for clinically relevant gram-negative and gram-positive bacteria,and would become a powerful tool in clinical microbiology laboratory.

Objective:To express and purify the TRIM5? chimaera[TRIM5? H(R328-332)] protein and to explore the interaction between the TRIM5? H(R328-332)and HIV-1gag. Methods:The plasmid pET28aTRIM5? H(R328-332) was transformed to E.coli BL21 (DE3) strain ,and the expression of TRIM5? H(R328-332) protein was induced by IPTG,purified with Ni2+ chromatography.The expression and purification of TRIM5? H(R328-332) were analyzed by SDS-PAGE and Western blot,and the interaction between TRIM5? H(R328-332) and HIV-1gag was detected by co-immunoprecipitation,His pull-down and ELISA. Results:The recombinant plasmid pET28aTRIM5? H(R328-332) was successfully expressed in E.coli. The results showed that the purified full length TRIM5? H(R328-332) interacted with HIV-1gag protein. Conclusion:The human TRIM5? chimaera was expressed successfully in vitro,and the study demonstrates that the human TRIM5? chimaera interacts with HIV-1 gag in vitro.

Objective To study the characteristics of articles,citations and authors in Chinese Critical Care Medicine (Chin Crit Care Med).Methods The date about articles,citations and authors of Chin Crit Care Med from 2005 to 2006 were collected and analyzed in terms of bibliomertic parameters.Results There were 612 papers published in Chin Crit Care Med during 2 years and the papers with funded projects were accounted for 63.1%.The authors came from 30 provinces,autonomous regions and municipalities directly under the central government in China.The average number of articles per issue was 26;the paper density was 0.40 and the average period from the date of submission to publication was 5.2 months.Among these papers,87.6% were shared with co-authors,with cooperation rate of 4.40.The papers with citation were accounted for 85.1% and 95.9% of the citations in English came from journals.The Price's index was 58.2%.Conclusion The articles published in Chin Crit Care Med have high quality.It is one of the most important resources of information for researches in this field,and it is also a primary kernel journal in Chinese medicine field.

OBJECTIVETo study the relationship between fumonisin biosynthesis gene and toxicity of Fusarium moniliforme isolated in China.

METHODSThe toxigenic gene of 29 Fusarium moniliforme isolated from different provinces and varied food samples were determined. Eighteen fum5-positive strains were selected for biosyhesizing fumonisin and determined by high performance liquid chromatography (HPLC).

RESULTSTwenty-six isolates were identified as fum5 gene positive strains. And all of these strains produced FB(1), FB(2) and FB(3). The amount of FB(1), FB(2) and FB(3) was ranging from 0.41-140.20 mg/kg, 0.06-14.30 mg/kg to 0.30-58.00 mg/kg, except one strain produced a lower level of FB(1) only. It wight be the first report showing a high level fumonisin-producing strain isolated from the sesame sample and identified in the world. The amount of FB(1), FB(2) and FB(3) produced by the isolate was 128.84 mg/kg, 11.80 mg/kg and 14.88 mg/kg.

CONCLUSIONSIt should have a close relationship between fumonisins biosynthesis gene and toxicity of Fusarium moniliforme isolated in China. The study demonstrated that strain of Fusarium moniliforme might contaminate the sesame sample and produce a high level of fumonisins.

China ; Chromatography, High Pressure Liquid ; Food Contamination ; analysis ; prevention & control ; Fumonisins ; analysis ; metabolism ; Fungal Proteins ; genetics ; metabolism ; Fusarium ; genetics ; isolation & purification ; metabolism ; Sesamum ; microbiology

BACKGROUND:The traditional two-dimensional culture system has been widely used in the in vitro culture of human tissue stem cells,but it cannot really simulate the three-dimensional physiological microenvironment in the body, which is not conducive to the study of the biological behavior of human stem cells. OBJECTIVE: To detect the effect of the bioactivity of Col-Tgel in human hematopoietic stem cells (HSCs) and mesenchymal stem cells (MSCs)in vitro and in vivo,by constructing a three-dimensional culture system stimulating the physiological microenvironment of the body. METHODS:(1)In vitro co-culture:Green fluorescent protein labeled MSCs(MSCs-GFP)and human umbilical cord blood CD34+cells were co-cultured in Col-Tgel for 3 days (three-dimensional culture group). Human umbilical cord blood CD34+cells were cultured in Col-Tgel for 3 days as single culture group. MSCs-GFP and human umbilical cord blood CD34+cells were co-cultured in Transwell chamber for 3 days as two-dimensional culture group. Human umbilical cord blood CD34+cells were cultured routinely as control group. The percentage of CD34+CD38-CD45RA-CD90+cells in each group was measured by flow cytometry. In situ immunofluorescence staining was used to detect the activity of cells that were co-cultured in Col-Tgel.(2)In vivo transplantation:NOD/SCID mice subjected to 24-hour X-ray irradiation were divided into two groups: in experimental group, MSC-GFP cells were resuspended in Col-Tgel and transplanted into the tibia of NOD/SCID mice; in control group, MSCs-GFP were resuspended in PBS and transplanted into the tibia of NOD/SCID mice. The MSC-GFP growth in the bone marrow was detected by two-photon/confocal microscopy at 3 days post transplantation. RESULTS AND CONCLUSION: (1) After co-culture in Col-Tgel for 3 days, the percentage of CD34+CD38-CD45RA-CD90+cells in the three-dimensional culture group was 2.8 times that of the two-dimensional culture group, indicating that the MSCs significantly promoted the expansion of CD34+CD38-CD45RA-CD90+cells in the Col-Tgel. The percentage of CD34+CD38-CD45RA-CD90+cells in the three-dimensional culture group was increased by 4.5 times compared with the single culture group and increased by 1.5 times compared with the control group. Immunofluorescence staining showed that the cell viability of human MSCs and human umbilical cord blood CD34+cells was not affected after co-cultured in Col-Tgel for 3 days.In the in vivo transplantation experiment,MSC-GFP cells could survive in the medullary cavity.In summary, Col-Tgel provides a new strategy for stem cell culture and in vivo growth by forming a three-dimensional system similar to the physiological environment in vivo.