Objective To develop a whole-genome DNA microarray based on the genomic sequences of Y. pestis CO92 and 91001 and its use in comparative genomic analysis. Methods A total number of 4 005 genes of Y. pestis were amplified by PCR and printed onto glass slides in duplicate. Fluorescently labeled probes were prepared by marking genomic DNAs with random hexamers and Klenow. Labeled DNAs were hybridized with the microarrays by the method of two-fluorescence comparative hybridization. Three sets of two-fluorescence hybridizations were performed to examine the absence/presence of each gene. Results The results agreed with those derived from the in silico genomic comparison. Conclusion The results demonstrate that the microarry can be a useful tool for comparative genomic analysis of Y. pestis.

Objective To identify and compare the genome differences among live plague vaccines prepared with different strains of the bacillus. Methods The whole-genome DNA microarray of Yersinia pestis was used as a tool to perform genomic comparison among live plague vaccines prepared with 19 different strains. Results Dozens of deletions and/or increased copies of the genomic fragments were identified in the studied vaccines of different strains. Conclusion The revealed genomic differences among the vaccines from different origins account for the variability of the immunogenic and protective potency of live plague vaccines. The whole-genome DNA microarray was also provesd to be an ideal tool for the pre-evaluation of a vaccine strain.

AIM:Xilei Powder,a traditional Chinese prescription,has been used to treat wounds for hundreds of years,but the mechanism has not been fully understood.METHODS:The effects of Xilei Powder on fibroblast proliferation,collagen accumulation,matrix metalloproteinases-2,9(MMP-2,9)activities and tissue inhibitor of metalloproteinase 1(TIMP-1)production were investigated by MTT,chloramine T method,gelatin zymography and enzyme-linked immunosorbent assays(ELISA),respectively.RESULTS:The aqueous extract of Xilei Powder significantly promoted fibroblasts proliferation in a time and concentration manner,the population doubling time(125 ?g/mL)was 33.8 h,it also significantly(P

AIM:Xilei Powder,a traditional Chinese prescription,has been used to treat wounds for hundreds of years,but the mechanism has not been fully understood.METHODS:The effects of Xilei Powder on fibroblast proliferation,collagen accumulation,matrix metalloproteinases-2,9 ( MMP-2,9 ) activities and tissue inhibitor of metalloproteinase 1 (TIMP-1) production were investigated by MTT,chloramine T method,gelatin zymography and enzyme-linked immunosorbent assays ( ELISA),respectively.RESULTS: The aqueous extract of Xilei Powder significantly promoted fibroblasts proliferation in a time and concentration manner,the population doubling time (125 μg/mL) was 33.8 h,it also significantly (P ＜0.05 ) promoted collagen production.Both of the aqueous and alcoholic extracts could significantly ( P ＜ 0.05 ) increase MMPo2 activity,and also very significantly ( P ＜ 0.01 )promote TIMP-1 production.CONCLUSION: Xilei Powder could promote fibroblasts proliferation,collagen and TIMP-1 production,this might be parts of mechanism to promote wound healing.

Objective To explore the relevance between lymphatic metastasis and CT findings in colorectal cancer,and to estab-lish the logistic regression model to realize CT prediction for N staging in colorectal cancer.Methods Take 53 patients with complete data and colorectal cancer confirmed by pathology,and conduct correlation and regression analysis on pathological results based on the size,shape,density,edge and distribution characteristics of the regional lymph nodes that were expressed on CT images.Results It was predicted that patients with colorectal cancer showed lymph node metastasis,a number of lymph nodes with the minor axis≥ 8 mm and the irregular margin were selected in Logistic stepwise regression,the sensitivity of probabilistic model was predicted to be 85.7 %,specificity was 91.7 % and accuracy was 88.9 %;predict whether it had N2 stage,a number of lymph nodes with the heterogeneous density and the fuzzy margin were selected in Logistic stepwise regression,the sensitivity of probabilistic model was predicted to be 60.0 %,specificity 94.3 % and accuracy 86.7 %.Conclusion Lymph nodes with minor axis ≥ 8 mm,irregular margin,and heterogeneous density were the most important indicators for N staging in colorectal cancer,the combination and weigh-ting of these indicators can improve the accuracy of N staging in colorectal cancer.

Objective To invesigate the reproducibility of automated breast volume scanner ( ABVS) in detection of breast lesions . Methods Thirty‐five patients with breast lesions diagnosed by conventional hand‐hold ultrasound were involved in the study . Every patient underwent ABVS twice by two different doctors . The number ,location and size of findings were documented and analyzed . Intra‐class correlation coefficients were used to evaluate the reproducibility . Results The number of findings was 67 and 68 respectively ,and the cronbach′s ɑwas 0 .997 . The ɑ of distance from nipple ,distance from skin ,and clock face location were 0 .343 ,0 .883 ,and 0 .949 . The ɑ of length superior‐inferior ,medial‐lateral ,and anterior‐posterior were 0 .938 ,0 .936 ,and 0 .948 . Conclusions The reproducibility of ABVS in detection of breast lesions is perfectly high . ABVS may be a good modality in monitoring benign lesions and evaluating neoadjuvant chemotherapy in the future .

Purpose To observe the curative effect of combined acupuncture and medicine on anxiety. Method An acupuncture plus medicine group and a medicine group were established for a comparison of their curative effects on anxiety. Results The total effective rate was 96% in the acupuncture plus medicine group and 64% in the medicine group, and there was a significant difference between the two groups (P<0.001). Conclusion The curative effect of combined acupuncture and medicine on anxiety is better than that of simple medicine.

Objective To observe the effects of seawater immersion at different temperatures on survival time and mortality and physiological state of non-anesthetized rats.Methods Totally 100 SD male rats(The abdominal cavity was implanted with a temperature sensor in advance)were randomly divided into five groups which were immersed in 20 ℃,17 ℃,15 ℃,13 ℃ and 10 ℃ seawater,respectively.Each group contains 20 rats.The changes of respiration,heart rate and muscle fibrillation within 2 hours were observed and the survival time and mortality of each group were counted in 24 hours.The decrease trend of intraperitoneal temperature in rats was analyzed retrospectively within 2 hours.Results Soaking for 10 minutes,the respiratory and heart rate of each group were significantly increased,but there was no significant difference among groups(P>0.05).The respiratory and heart rate decreased rapidly between 10 and 40 minutes,and the decline was slower relatively between 40 and 80 minutes.Soaking for 80 minutes,the respiration rate of rats among groups had significant difference(P<0.05).Immersing for 100 minutes,the heart rates of rats in each group were significantly different(P<0.05).Soaking for 20 minutes,the muscle fibrillation of 15 ℃,13 ℃ and 10 ℃ group reached the peak,and there were significant differences among groups(P<0.05),then disappeared.However the rats in 20 ℃ and 17 ℃ group reached the peak at 30 minutes,but there was no significant difference between two groups(P>0.05),hereafter the muscle fibrillation was maintained at a certain level.The mean survival time of 20 ℃ group,17 ℃ group,15 ℃ group,13 ℃ group and 10 ℃ group in 24 hours were(23.6±1.23)hours,(15.0±4.16)hours,(7.7±3.21)hours,(2.4±0.91)hours and (1.1±0.39)hours,respectively,and the survival curve of each group was statistically significant(P<0.05).The intraperitoneal temperature of rats showed a decline in the cliff,the lower the water temperature,the faster the descending.Soaking for 40 minutes,the difference of intraperitoneal temperature of each group was statistically significant(P<0.05).Conclusion The effects of seawater immersion at different temperatures on the physiological state and survival time and mortality of rats are significantly different.With the decrease of water temperature,the physiological state changes more obviously,the survival time is shorter and the mortality rate is higher.

Objective To construct an eukaryotic expression vector of human telomerase reverso transcriptase (hTERT) gene specific shRNA, and investigate the effect of pshRNA-hTERT combined with γ-irradiation on telomerase activity and DNA damage. Methods The recombinant expression plasmid pshRNA-hTERT was constructed and transfected into Hep-2 cells. The telomerase activity was examined by the PCR-hased telomeric repeat amplification protocol (TRAP). DNA single-stranded break (SSB) and the DNA double-stranded break (DSB) were detected by Comet assay. The xenograft model of human laryngeal carcinoma with the same genetic background and different radiosensitivity (Hep-2 and Hep-2R) was established in nude mice. The mixture of pshRNA-hTERT and liposome was injected to the transplanted tumor to observe the inhibition of the tumor growth. The cell apoptosis was detected by TUNEL. The hTERT protein expression was determined by streptavidin-peroxidase conjugated method (AP). Results Recombinant expression plasmid pshRNA-hTERT was successfully constructed and transfected into Hep-2 cells. The hTERT expression inhibition rate reached 60.78 %. pshRNA-hTERT not only inhibited telomerase activity of Hep-2 inehiding the increase of telomerase activity induced by γ-irradiation, but also inhibited the repair of the SSB and DSB induced by irradiation in the human laryngeal carcinoma xenograft in nude mice with the same genetic background and different radiosensitivity. The pshRNA-hTERT combined with γ-irradiation could inhibit the growth of transplanted tumor (Hep-2: EPO = 1.79; Hep-2R: EPO = 2.01) with reduced telomerase activity and hTERT protein expression. Conclusions The eukaryotic expression vector pshRNA-hTERT could enhance the radiosensitivity of Hep-2 cells in vitro and the human laryngeal carcinoma xenograft in nude mice which had the same genetic background with different radiosensitivity.

OBJECTIVESTo improve the diagnosis of patients with neurogenic lower urinary tract dysfunction and to provide a basis for proper selection of rehabilitation methods.

METHODSThe urodynamics was tested with Assend Urodynamic Instrument in 220 patients with spinal cord injury. Of these patients, 100 received regular cystometrograrhy (CMG) and urethal pressure profile (UPP) test, and the remaining patients were measured by bladder/ external sphincter pressure profile. The detrusor pressure, maximum detrusor voiding pressure, and maximum urethral pressure were recorded. The date from the tests were processed with SPSS 8.0 (independent samples T test).

RESULTSThe maximum urethal pressure (83 +/- 39) cm H(2)O (1 cm H(2)O = 0.098 kPa) and maximum voiding detrusor pressure (12 +/- 10) cm H(2)O were lower in coda-equina group than in other groups (t = 2.096,P < 0.05). The group with different spinal cord injury had almost an equal ratio of low bladder compliance (51.2%, 52.4% and 50% separately). Statistical differences were found between complete injury and incomplete injury in each group(t = 1.023, P > 0.05). In bladder/external sphincter cystometry, urethral pressure profile could be classified into four types.

CONCLUSIONSThe maximum urethral pressure and maximum pressure of detrusor contractile were lower in the cauda-equina injury group than in other groups. The cauda-equina injury group showed a lower incidence of detrusor sphincter because most of these patients were incompletely injured. The features of urethral pressure profile in bladder/external sphincter cystometry resulted from the abnormal contraction of external sphincter and periurethral striated muscles.

Adolescent ; Adult ; Aged ; Child ; Child, Preschool ; Female ; Humans ; Male ; Middle Aged ; Spinal Cord Injuries ; complications ; physiopathology ; Urinary Bladder ; physiopathology ; Urodynamics ; Urologic Diseases ; physiopathology