Pingyangmycin was produced by Pingyangnesin sp No. 74 which was isolated from mud at Pingyang, Zhejiang China. The structure and properties of Pingyangmycin are the same as those of bleomycin A-g. Pingyangtnycin-induced cellular DNA breakage was observed in this experiment. DNA breakage in vitro was found by agarose gel electrophoresis and UV fluoresene photography after ethidium bromide staining 0. 5ug cellular DNA incubated with a series of drug concentrations for 2h and with a series of drug exposure times at a dose of 200 ug/ml. The mininal concentration and exposure time of DNA breakage is 5 ug/ml and 10 min. DNA molecule was observed under electron microscope with basic protein mounting technique. The natural spiral DNA long strand (X =5.95 um+1.95)was cut down into short DNA fragments ("X =0.75 n.m+0.24)by 10 ug/ml drug for 2h_ The length of untreated DNA is significantly longer than that of the drug treated one(P

ObjectiveTo investigate the relationship of HLA-DRB1 allele polymorphism and antineutropil cytoplasmic antibody ( ANCA ) with the susceptibility to antithyroid drug ( ATD ) -induced leucocytopenia in the patients with Graves' disease (GD) in Anhui Han Chinese.MethodsThe HLA-DRB1 * 08032,DRB1 * 1501,and DRB1 * 0901 allele frequencies were determined by the polymerase chain reaction-based sequence-specific primer (PCR-SSP) method in 76 patients with Graves' disease who had ATD-induced leucocytopenia and 98 patients with Graves' disease treated with ATD,who were free from leucocytopenia.The other230 healthy subjects served as controls.Indirect immunofluorescence assay (IIF) was used to detect ANCA positive rate.Result( 1 ) Compared with the controls and the GD patients without leucocytopenia,the allele frequencies ofDRB1 * 08032 and DRB1 * 1501 in patients with ATD-induced leucocytopenia were significantly increased ( OR were 3.06,1.77,4.03,and 2.28,all P＜0.05),while that of HLA-DRB1 * 0901 was decreased ( OR were 0.33 and 0.43,both P＜0.05 ).(2)The ANCA frequencies were significantly increased in the GD patients with methimazole-induced leucocytopenia compared with those without leucocytopenia (x2 =4.878,P＜0.05 ).( 3 ) Compared with the GD patients not carrying DRB1 * 08032,DRB1 * 1501,and DRB1 * 0901 alleles,the ANCA positive rates were significantly increased in the GD patients carrying these alleles(x2 were 5.682,5.429,4.009,and 4.549,all P＜0.05).ConclusionsThe DRB1 * 08032 and HLA-DRB1 * 1501 alleles may be susceptible to ATD-induced leucocytopenia in Anhui Hans,while HLA-DRB1 * 0901 alleles may be protective or resistant gene.Immune response may be involved in the development of leucocytopenia.The occurrence of immune response is based on the genetic susceptibility.

Objective To analyze the consistency of transcutaneous perianal ultrasonography (TPUS) and pelvic magnetic resonance imaging (MRI) in diagnosing perianal lesions of Crohn's disease (CD), and to evaluate the value of transcutaneous perianal ultrasonography in detecting perianal lesions of CD. Methods A cohort of 102 patients diagnosed as Corhn's disease were enrolled from August 2008 to August 2010. Perianal abscess and fistula of these CD patients was diagnosed by ultrasonography and MRI system. Statistics was performed with SPSS 11.5 software for X2 test. The consistency was analyzed with Kappa test. Results The mean onset time of perianal lesions in CD was -0.443 year (95％CI:-1.659～0.773 year) before typical symptoms showed up. There was no significant difference in detecting perianal lesions of CD between transcutaneous perianal ultrasonography and pelvic magnetic resonance imaging (P ＝ 0.706, Kappa ＝ 0.541). If pelvic magnetic resonance imaging was considered as the golden standard in detecting perianal lesions of CD,the sensitivity (Sen), specificity (Spe), Youden's index, positive predictive value (PPV) and negative predictive value (NPV) of TPUS were 72.73％, 82.61％, 0.55, 66.67％ and 86.36％ respectively.Furthermore, there was no significant difference between transcutaneous perianal ultrasonography and pelvic magnetic resonance imaging in detecting perianal abscess ( P ＝ 0.706, Kappa ＝ 0.496) and fistula (P＝0.655, Kappa＝0.546) of CD. Conclusions Perianal lesions occur in the entire course of CD. There was favorable consistency between transcutaneous perianal ultrasonography and pelvic magnetic resonance imaging in detecting perianal abscess and fistula of CD. Transcutaneous perianal ultrasonography can be used as an additional method in detecting and evaluting perianal lesions of CD.

Objective To compare the effect of treating hyperglycemia on insulin pump therapy in newly diagnosed type 2 diabetes mellitus(T2DM) and the patients with failure to oral antidiabetic therapy. Methods Selecting 32 patients with newly diagnosed T2DM(NDM group)and 64 T2DM patients with failure to oral antidiabetic therapy(ODM group),which were treated by insulin pump,having no significant difference of the level of blood glucose,body mass index(BMI),age,proportion of sex between NDM group and ODM group. Results (1)The mean time and the maximal dosage of insulin for blood glucose to be targeted in NDM group were all lower than those in ODM group(P all

Objective To investigate the oxidative stress status and cardiac myocyte apoptosis in rats with propylthiouracil-induced hypothyroidism and to examine the effect of levothyroxine ( LT4 ),vitamin E ( VitE ),and both supplementation on this experimental model.Methods Male Sprague Dawley rats were divided into normal control group( NC),propylthiouracil group( PTU ),LT4 treatment group( PTU + LT4 ),VitE treatment group ( PTU +VitE),LT4 and VitE combination therapy group (PTU + LT4 + VitE).Serum T3,T4,TSH levels,serum and myocardial superoxide dismutase ( SOD ) activity and malondialdehyde ( MDA ) content were determined.Cardiac myocyte apoptotic index was made with TUNEL.Results ( 1 ) Compared with NC group,T3 and T4 levels were significantly lower and TSH level was significantly higher in PTU group and PTU+VitE groups( P＜0.05 ).Compared with PTU group,T3 and T4 levels were significantly higher and TSH level was significantly lower in PTU + LT4 group and PTU + LT4 + VitE group( P＜0.05 ).There were no statistical differences in T3,T4,and TSH levels between PTU group and PTU + VitE group( P＞0.05 ).( 2 ) Compared to NC group,serum and myocardial MDA levels in PTU group increased significantly( P＜0.05 ),serum SOD activity decreased significantly ( P＜0.05 ),while myocardial SOD activity showed no significant difference( P＞0.05 ).( 3 ) Compared with NC group,myocardial apoptosis index was significantly higher in PTU and PTU + VitE groups( P＜0.05 ).Compared with PTU group,myocardial apoptosis index was significantly lower in PTU + LT4 group and PTU + LT4 + VitE group( P＜0.05 ).Conclusion LT4,VitE,and their combined treatment of hypothyroidism in rats reduce the myocardial cells apoptosis,which may be related to the improvement of thyroid function and amelioration of oxidative stress.

Assessment mode is a bottleneck in medical education reform nowadays.Although traditional assessment tools,such as written examination,are still widely used in medical education assessments,they have obvious limitations.With the enhancement of requirements in physicians' abilities,assessments on some basic abilities of physicians are still insufficient.The United States and Europe not only focus on the curriculum reform but also the development of appropriate assessment tools,therefore,some new assessment tools are invented.These assessment tools are applicable to the formative assessment and are student-centered,being able to promote the development of education and provide new options for medical education assessments.

Objective To investigate the expression of CD40-CD154 co-stimulatory pathway in peripheral circulation and intestinal mucosa in patients with inflammatory bowel disease (IBD),the difference between the expression of CD40-CD154 in patients with IBD and that in healthy controls,and the correlation between CD40-CD154 levels and disease activity. Methods A total of 62 patients with Crohn's disease (CD),64 patients with ulcerative colitis (UC) and 56 healthy controls were enrolled. Enzyme-Linked Immuno Sorbent Assay (ELISA),SYBR-green real time PCR and immunohistochemical assay were respectively applied to evaluate expression of CD40-CD154 in plasma,mononuclear cells of peripheral blood and intestinal mucosa. Results Levels of CD40 (P=0. 000) and CD154 (P=0. 001) in plasma,mononuclear cells of peripheral blood and intestinal mucosa were significantly higher in patients with CD and UC than in healthy controls. However,no correlation between disease activity and CD40-CD154 expression in peripheral circulation or intestinal mucosa was detected (P ＞ 0. 05 ). Conclusion CD40-CD154 pathway activation is found in plasma,peripheral blood mononuclear cells and intestinal mucosa in patients with IBD,but is not correlated with disease activity.

Objective To detect the expression of inducible nitric oxide synthase (iNOS) and heme oxygenase-1(HO-1) in human colon of irritable bowel syndrome(IBS), aim at finding out the role of gas messenger molecule such as nitric oxide(NO) and carbon monoxide(CO) in the pathogenesis of IBS. Methods The expression of iNOS and HO-1 in human colonic tissue specimen of enteroscope was detected by En vision and SABC immunohistochemistry each in 34 cases of IBS and 16 cases of normal control group. Results The expression of iNOS and HO-1 expressed mainly in the colonic mucous membrane epithelia, and the expression in IBS group was higher than that in normal control group(P

Objective To develop a questionnaire suitable for China's cultural background on nurses' attitudes towards the causes of aggressive behavior in patients with schizophrenia,and to test its reliability and validity.Methods By literature review,semi-structured interview and combining with the China's conditions,the draft of the questionnaire item pool was formed,which was evaluated by the experts.Then the reliability and validity of the questionnaire were tested by investigating 340 nurses.Results The effective questionnaires were 312 copies.The questionnaire included 4 dimensions and 29 items.Exploratory factor analysis extracted 4 factors,the total explained variance was 56.175％.The Cronbach alpha coefficient of the questionnaire was 0.909,and the dimensions' Cronbach alpha coefficient was 0.812-0.896.The testretest reliability of the questionnaire was 0.897,and the dimensions' test-retest reliability was 0.742-0.886.The average of total questionnaire's content validity index was 0.968 and the average of the dimensions'content validity index was 0.943-0.978.Conclusions The questionnaire has good reliability and validity,which can be used to investigate nurses' attitudes towards the reasons of the aggressive behavior in patients with schizophrenia.

Objective:To evaluate the relationship between the phthalate ester exposure and the population obesity with Meta-analysis, and to provide a new idea for prevention and control of obesity. Methods:A comprehensive search was performed in English databases (Pubmed, Web of Science, The Cochrane Library, Elsevier Science Direct and OVID) and Chinese databases (Sinomed database, CNKI database, VIP database, Wanfang database).The studies about the relationship between phthalate ester exposure and the population obesity were retriveded.The Chinese and English studies were selected according to the inclusion criteria and exclusion criteria.Meta-analysis was performed using RevMan 5.3 software.Results:Six studies were finally obtained, involving 1259 samples.The Meta-analysis results showed that the monobutyl phthalate (MBP) level in urine of the obesity population was increased 4.1 times compared with the normal population (95%CI:1.43-6.76);while the combined effect values of dibutyl phthalate (DBP), di-2-ethylhexyl phthalate (DEHP) and diethyl phthalate (DEP) level in serum of the population in two groups were 1.17 (95%CI:0.64-1.69), 0.80 (95%CI:0.13-1.48), and 0.72 (95%CI:-0.19-1.63);the combined effect values of monoethylhexyl phthalate (MEHP) and monoethyl phthalate (MEP) levels in urine were 1.75 (95%CI:-0.45-3.96) and 2.75 (95%CI: 0.36-5.15);there were no significant differences (P>0.05).Conclusion:The elevated MBP levels in the urine may be a risk factor for obesity in the population, suggesting that MBP may contribute to obesity.