Humans ; Occupational Diseases/epidemiology* ; Occupational Health ; China/epidemiology* ; Occupational Exposure

Objective To prepare centromere-associated protein E(CENP-E)polyclonal antibody with specificity by using New Zealand white rabbits.Methods Prokaryotic expression plasmid of pHis-CENPEC410 was constructed by molecular cloning technique and then transformed into competent cells of E.coli BL-21 (DE3).HisCENPEC410 fusion protein was induced by isopropyl β-D-thiogalactoside (IPTG) and purified by affinity chromatography using Ni-NTA beads.The purified protein was used as antigen to immune New Zealand white rabbits to produce spccific polyclonal antibody of CENP-E.The antibodies serum was detected by immunoblotting and co-immunoprecipitation,and the purified antibodies were detected by immunofluorescene staining.Results The results of immunoblotting and co-immunoprecipitation demonstrated that the antibody serum was effective and the purified antibody could be applied to immunofluorescene test.Conclusions CENP-E polyclonal antibody with high specificity and sensitivity was obtained,which lay the foundation for the follow-up study of CENP-E.

In this article we report the results on the synthesis and accumulation of PHAs by Rhodocista pekingensis (strain 3-p), a phototroph that was isolated from wastewater treatment plant. Our results showed that the optimal conditions for PHAs accumulation with strain 3-p were as following: 0.01% Yeast Extract, 0.01% NH 4Cl, Acetate 5 g/L, and medium pH of 7.0～7.2.Under optimized conditions, strain 3-p accumulated PHAs up to 60% of its cellular dry weight. Enzymatic activities of ?-ketothiolase, acetoacetyl-CoA reductase, and PHA polymerase were detected and their activities increased as PHA synthesis initialized. Based on these study, we proposed the metabolic pathway of this strain should be:Acetate (or other fatty acids) - Acetyl-CoA --- thiolase Acetoacetyl-CoA --- reductase D (-)-?-Hydroxybutyryl-CoA ----- PHA polymerase PHAs.

Objective To explore the function and significance of caudal type homeobox transcription factor-2 (CDX)-2,heparin-binding epidermal growth factor-like growth factor (HB-EGF) and bone morphogenetic protein 4 (BMP-4) of esophageal stromal tissues in the pathogenesis of Barrett's esophagus (BE).Methods A total of 116 patients were divided into groups according to gastroscopic finds and hematoxylin-eosin (H &E) staining of biopsy samples.They were divided into control group (n=29),RE group (n=32),BE group (n=35),RE treatment group (n=10) and BE treatment group (n=10).The expression of CDX 2,HB-EGF and BMP-4 in different esophageal mucosal lesions was detected by immunohistochemical staining and the changes of positive expression levels of CDX-2,HBEGF and BMP 4 were compared among groups.Variance analysis and chi-square analysis were performed to analyze the correlation among the three factors.Results The CDX-2 positive cell number of control group ((0.0±0.0)/high power field(HPF)),RE group ((43.1±10.6)/HPF),and BE group ((67.8±11.3)/HPF) increased in turn,and the differences among three groups were statistically significant (F=67.664,P＜0.01).The HBEGF positive ((6.4±1.4)/HPF,(39.4±13.5)/HPF,(55.8±13.9)/HPF) and BMP 4 positive ((0.0±0.0)/HPF,(22.6±6.4)/HPF and ((25.1± 10.3)/HPF) cell number of three groups had the same trend and the differences among three groups were statistically significant (F HB-EGF =22.925,FBMP-4 =10.463,both P＜0.01).Except the expression of BMP-4 between RE group and BE group,there were significant differences between every other two groups (LSD test,all P＜ 0.01).The expression of CDX 2,HB EGF,BMP-4 in RE treatment group ((21.7±1.7)/HPF,(16.6±5.0)/HPF and (9.2±1.0)/HPF) and BE treatment group ((51.4±8.7)/HPF,(31.0± 10.4)/HPF and (12.7±3.9)/HPF) were lower than those in RE group and BE group respectively,the differences were also statistically significant (LSD test,all P＜0.05).In RE group,the positive rate of CDX-2 (31.2％ (10/32)) was significantly lower than that of HBEGF and BMP4 (62.5％ (20/32) and 56.2％(18/32)),and the differences were statistically significant (x2=6.275 and 4.063,both P＜0.05).However in BE group,there was no statistically significant difference in the positive rate among CDX-2(85.7％(30/35)),HB-EGF (88.6％(31/35)) and BMP-4 (74.3％(26/35),all P＞0.05).Conclusions CDX-2,HB-EGF and BMP-4 may play an important role in the pathogenesis of RE and BE.HB-EGF and BMP-4 may be involved in the early episodes of BE genesis and have promotion effects on CDX-2 expression.HB-EGF and BMP-4 may be the new target in the research and treatment of BE.

Objective To compare the blood-saving effect when acute hypervolemic hemodilution (AHH) was performed with hydroxyethyl starch (HES) 130/0.4 dissolved in electrolyte injection (HES-E) and HES 130/0.4 in sodium chloride injection (HES-NaCl).Methods Thirty patients of both sexes,aged 18-60 yr,of American Society of Anesthesiologists physical status Ⅰ or Ⅱ,with body mass index of 18-25 kg/m2,hemoglobin (Hb) ＞100 g/L,hematocrit (Hct) ＞ 35％,scheduled for elective abdominal operations under general anesthesia,were randomly divided into HES-E group and HES-NaCl group using a random number table,with 15 patients in each group.AHH was performed after induction of anesthesia.In HES-E and HES-NaCl groups,HES-E and HES-NaCl 15 ml/kg were intravenously infused over 30 min,respectively,and the infusion was conpleted before skin incision.Immediately after onset of AHH (T1),at 2 h after the end of AHH (T2),and at the end of operation (T3),arterial blood samples were collected for blood gas analysis and blood routine test,and pH value,base excess,HCO3-,K+,Na+,Cl-,Ca2+,Hb and Hct were recorded.Venous blood samples were collected at T1 and T2 for measurement of blood coagulation parameters including prothrombin time,activated partial thromboplastin time and fibrinogen and thrombelastography parameters.The volume of liquid intake and output and requirement for allogeneic blood transfusion were recorded,and the blood volume expansion rate was calculated.Results Compared with group HES-NaCl,no significant changes were found in the total volume of liquid infused,requirement for allogeneic blood transfusion,blood volume expansion rate,blood coagulation parameters at each time point,Hb and Hct (P＞0.05),pH value,base excess,HCO3 and K+ were significantly increased,and Na+ and Cl-were significantly decreased in group HES-E (P＜0.01).Conclusion There is no significant difference in the blood-saving effect between AHH with HES-E and HES-NaCl clinically,but HES-E can maintain homeostasis better.

To enhance the capacity for extending and applying appropriate health technologies in rural areas in China,this paper proposes a supportive policy system that incoperates macro,average and microlevels. Thepolicysystemfocusesonorientation, incentives, regulationsand standardization,and its objectives and measures of each level are described.The policy system will contribute to the sustainable development rural health work.

ObjectiveByreportinga fatalcaseof severelupusnephritis(LN) complicated with invasive aspergilluspneumonia and meningitis and reviewing the associated literatures,to provide a way of early diagnosis andproper management for the patients suffering from systemic lupus erythematosus(SLE) and invasive fungus infection(IFI).MethodsThe onset,diagnosis and treatment course of the disease were described and associated literatures werereviewed to analyze and summary the diagnostic methods,common pathogenic bacteria and predisposing factors of SLE patients with IFI.ResultsApplication of IFI guideline for cancer patients and those undergoing hematopoietic stem cell transplantation could be helpful in the early diagnosis and treatment of SLE patients complicated with IFI.The most common pathogen of SLE patient suffering from IFI was cryptococcus neoformans and aspergillus,not candida albicans.The mainpredisposingfactorswerehighlupusactivityandimmunosuppressant.Conclusions Guideline of IFI for cancer patients and those undergoing hematopoietic stem cell transplantation is also helpful for the SLE patients complicated with IFI.The most common pathogens of IFI in SLE patients are cryptococcusneoformansand aspergillus.The predisposing factors are high lupus activity and immunosuppressant.

Animals ; Cell Survival ; Cells, Cultured ; GTP-Binding Proteins ; metabolism ; Isoproterenol ; adverse effects ; Myocytes, Cardiac ; cytology ; drug effects ; metabolism ; Rats ; Rats, Sprague-Dawley ; Receptors, Adrenergic, beta-2 ; metabolism

Dust ; analysis ; Laboratories ; standards ; Quality Control ; Reference Standards

Pesticides ; classification ; toxicity