Objective To screen the high-efficiency predominant bacteria which can decompound 2-mercaptobenzothiazole, the accelerant for producing latex, in the organic wastewater. Methods Sampling from manufacturing environment, we got the predominant bacteria by primary screening, isolating and functional tests, and performed simulated test ground decompounding tests by using all bacteria. The enrichment of the predominant bacteria was followed by screen and identification to select the high-efficiency bacteria. Results 75 strains of predominant bacteria were obtained by primary screening. The simulated decompounding tests were performed after the mixed bacteria were tamed. The ratio of elimination for chemical oxygen demand (COD) was about 60.8%-97.7%, and the average was 77.2%. The predominant bacteria adhered to the surface of the active carbon, the carrier, and formed the biological film. Through screening and identification the Bacillus cereus showed to be predominant (90%). Conclusion The technology of high-efficiency predominant bacteria can be used for decompounding 2-mercaptobenzothiazole in the organic wastewater.

Objective:To investigate the clinical effects of health and safety management in elderly patients receiving gastroenteroscopy under sedation.Methods:From February 2018 to November 2019, 126 elderly patients admitted to the cadre medicine and gerontology department of our hospital to undergo gastroenteroscopy under sedation were included as research subjects.According to the digital random number method, they were divided into the control group and the test group(n=63, each group). The control group was given routine management, while the test group was given routine management plus health and safety management.Clinical effects and safety were analyzed and compared between the two groups.Results:There was no significant difference in scores of the Hamilton anxiety scale(HAMA)and the Hamilton depression scale(HAMD)between the two groups before intervention.After intervention, the scores of HAMA and HAMD were lower in the test group than in the control group[(39.2±3.1)scores vs.(48.6±2.1)scores, (40.1±4.1)scores vs.(52.6±5.5)scores, t=19.926 and 14.463, both P=0.000]. The incidence of postoperative complications was lower in the test group than in the control group(7.94% or 5/63 vs.19.05% or 12/65, χ2=14.209, P=0.002). The differences between maximum and minimum values of heart rate(HR), diastolic blood pressure(DBP), respiratory rate(RR)and systolic blood pressure(SBP)were lower in the test group than in the control group(all P<0.05). The length of the procedure was shorter and the anesthetic dose was lower in the test group than in the control group(9.11±2.56 min vs.13.56±3.05 min, 15.35±2.66 ml vs.21.67±6.15 ml, t=8.870 and 7.486, both P=0.000). Patient satisfaction was higher in the test group than in the control group( χ2=16.383, P=0.014). Conclusions:Health and safety management can improve emotional health, stabilize vital signs and enhance satisfaction in elderly patients undergoing gastroenteroscopy under sedation.

ObjectiveTo study the effect of a recombinant plasmid encoding mouse interleukin 2 (mlL-2) on the immunogenicity of DNA vaccine against Chlamydia trachomatis(Ct) serovar E.Methods BALB/c mice were divided into 4 groups to be intramuscularly inoculated with blank plasmid(negative control group),DNA vaccine against Ct serovar E(DNA vaccine group),DNA vaccine against Ct serovar E and a recombinant plasmid containing mIL-2(combination group),and inactivated Ct serovar E elementary bodies (positive control group),respectively.The immunological effects were evaluated by posterior foot pad thickness,proliferation level of spleen lymphocytes,serum level of IL-4 and interferon (IFN)-γ in mice,and the capability to clear Ct genital tract infection.ResultsThe proliferation index of spleen lymphocytes in the combination group and positive control group was similar(3.64 ± 0.41 vs.3.77 ± 0.34),but was significantly different from that in the blank control group and DNA vaccine group (1.37 ± 0.21 and 2.52 ± 0.30).The serum level of IL-4 was(38.49 ± 12.24) pg/ml in the positive control group,significantly higher than in the negative control group,DNA vaccine group and combination group ((25.37 ± 18.93),(24.75 ± 8.49),(21.74 ± 6.43) pg/ml,respectively).With respect to the serum level of IFN-γ,the combination group and positive control group were similar ((1923.3 ± 518.1) pg/ml vs.(2712.5 ± 887.2) pg/ml),but were significantly different from the negative control group and vaccine group((310.8 ± 160.7) pg/ml and(601.3 ± 357.9) pg/ml).Six days after Ct challenge,the exfoliated cells from genital tract were positive for Ct culture in the negative control group,but negative in the other 3 groups.ConclusionIL-2 genetic adjuvant can enhance the immune response,especially Th1 type response,induced by the DNA vaccine against Ct serovar E.

Objective To study cellular immune responses induced by DNA vaccine against Chlamydia trachomatis (Ct) serotype E. Methods BALB/c mice were divided into three groups to be intramuscularly immunized by blank plasmid (negative control group), DNA vaccine against Ct serotype E (vaccine group), and inactivated Ct elementary body (positive control group), respectively. Two weeks after the last immunization,delayed-type hypersensitivity (DTH) response was evaluated; MTT assay was performed to detect the proliferation of spleen lymphocytes, ELISA to measure the serum level of interferon-γin mice. Some immunized mice underwent a genital challenge with Ct elementary body followed by isolation of Ct from exfoliated epithelial cells in genital tract and pathological examination of cervical tissue from the challenged mice. Results Compared to negative control group, vaccine group and positive control group experienced a stronger DTH response.The lymphocyte stimulating index and serum level of IFN-γwere highest in the positive control group (3.81 ±0.30, 2891.7 ± 1048.8 μg/L), followed by vaccine group (2.35 ± 0.25, 593.3 ± 342.6 μg/L) and negative control group (1.48 ± 0.15, 309.2 ± 157.9 μg/L), and significant difference was observed between the three groups (P ＜ 0.05 or 0.01 ). After Ct challenge, Ct was isolated from exfoliated epithelial cells and cervical tissue was damaged in the negative control group, while in the other two groups, Ct was undetected and genital tract tissue was intact. Conclusions The DNA vaccine against Ct serotype E could induce Ct-specific cellular immune responses to some extent, and offer a protection against vaginal challenge with Ct.