渗析用半透膜的制作

在中学渗析化学实验教学中,既可以采用鱼鳔、鸡蛋膜、猪小肠等自然材料制作半透膜,也可以采用胶棉制作半透膜,一方面具有制作简单、操作方便的优点,另一方面有助于实现化学与生活的结合,并为优化化学实验等提供有益的借鉴。

钴60-γ射线辐照对动物源性膜材指示病毒灭活效果的验证

目的验证钴60-γ射线辐照对动物源性膜材中模拟感染指示病毒的灭活效果。方法将3个连续批次的动物源性膜材中间品,按1∶10(m/V)加入预先测定滴度的CVB3、PRV、BVDV和PPV病毒。设立未经辐照的病毒为对照组,试验组经25 k Gy钴60-γ射线辐照后,提取浸提液,采用96孔板细胞病变(CPE)法观察各梯度稀释液的细胞病变情况,按照Reed-Muench法计算对照组和试验组中4种指示病毒的lg TCID50/0.1 ml,并对比辐照前后病毒滴度的变化情况。结果经25 k Gy钴60-γ射线辐照预先感染病毒的动物源性膜材后,实验结果显示4种指示病毒均不能使宿主细胞出现病变,各病毒滴度对数值变化均>4 logs,符合国家相关法规对动物源性材料病毒灭活效果的要求。结论25 k Gy钴60-γ射线辐照可以作为灭活动物源性膜材中潜在病毒的有效方法。

Protective Action of Acupuncture and Moxibustion on Gastric Mucosa in Model Rats with Chronic Atrophic Gastritis

Objective: To probe the mechanism of acupuncture and moxibustion in atrophic gastritis so as to provide a basis for clinical treatment. Method: Observe the effects of acupuncture and moxibustion at the points of Zusanli, Zhongwan and Tianshu on gastric mucosa in model rats with chronic atrophic gastritis. Results:Acupuncture and moxibustion can increase the contents of PGE2α, PGF2α and cAMP, and decrease the content of cGMP in the tissue of gastric mucosa. Conclusion: Acupuncture and moxibustion shows cytoprotection on gastric mucosa, so it is an effective method for treating chronic atrophic gastritis.

VARIATION IN MEMBRANE PROPERTIES FROM THE ACTION OF LAMININ ON MEMBRANE RECEPTORS

Biophysical studies were conducted on the action of laminin through membrane receptors of cancer cells. The results showed that variations occurred in the thermodynamic properties of membrane proteins,the mobility of hydrocarbon chains of membrane lipids, and the permeability and transportation pathways of the membrane.

制备医用生物补片材料装置的改进

目的 :对制备医用生物补片装置进行改进,使该类材料的制备可以实现规模化、自动化。方法 :通过综合分析原材料特点及各制备工艺流程步骤,对该装置的摇床进行改进,加装筒状处理系统。筒内设计动物膜材料的铺平固定装置,顶部和底部设计进液口和出液口,整个系统固定在摇床底座上。结果:使用该装置后,制备效率显著提升,原料利用率提高了20%,产品合格率提升了35%,制备周期缩短了33%,总体成本节约了40%。结论:该装置能够满足多种动物源材料的制备需求,制备工艺简单、批间差异小,原料利用率和产品合格率均有大幅度提升,降低了医用生物补片的生产成本,促进了医用生物补片在临床上的应用。

Expression and immunoactivity of chimeric particulate antigens of receptor binding site-core antigen of hepatitis B virus

AIM: To improve the immunogenicity of receptor binding site of hepatitis B virus (HBV) on preS1 antigen using HBV core antigen as an immuno-carrier. METHODS: One to 6 tandem copies of HBV preS1 (21-47) fragment were inserted into HBcAg at the sites of aa 78 and 82, and expressed in E.coli. ELISA, Western blot and animal immunization were used to analyze the antigenicity and immmunogenicity of purified particulate antigens. The ability to capture HBV by antibodies elicited by chimeric particles was detected with immuno-capture PCR. RESULTS: Recombinant antigens CI, CII, CIII carrying 1-3 copies of HBV preSl (21-47) individually could form virus-like particles (VLPs), similar to HBcAg in morphology. But recombinant antigens carrying 4-6 copies of HBV preSl (21-47) were poorly expressed in E.coli. Chimeric antigens were lacking of immunoreactivity with anti-HBc monoclonal antibodies (McAbs), but still reserved good immunoreactivity with anti-HBe McAbs. CI, CII, CIII could strongly react with anti-preS1 McAb, suggesting that preS1 (21-47) fragment was well exposed on the surface of chimeric VLPs. Three chimeric VLP antigens (CI, CII and CIII) could stimulate mice to produce high-level antibody responses, and their immunogenicity was stronger than non-particulate antigen 21-47*6, containing 6 copies of preS1 (21-47). Mouse antibodies to CI, CII and CIII were able to capture HBV virions in immuno-capture PCR assay in vitro. CONCLUSION: Chimeric particulate antigens of receptor binding site-core antigen of HBV can elicit strong antibody responses to preS1. They have a potential to be developed into prophylactic or therapeutic vaccines against HBV infection.

Rolling thin film oven test investigation for polymer modified asphalt

Rolling Thin Film Oven Test （RTFOT） is the AASHTO T240 standard method to simulate asphalt plant mix aging. But it has proven inadequate in aging polymer-modified asphalts （PMA）. NCHRP 9-10 offered a modified RTFOT （MRTFOT） by adding a steel rod in each bottle. Since construction temperature of PMA mixture is 10 ℃ -20 ℃ higher than that of conventional asphalt mixtures in the field, elevating RTFOT temperature for PMA is necessary for adequate aging and proper simulation. Six PMAs with various PG grades and sources were aged with RTFO at elevated temperatures. Some were also treated with MRTFOT for comparison. SHRP performance grade and phase angle were used as indicators to analyze the effects of RTFOT under different conditions. The results show that elevating the temperature is more effective than using rods. And PMA RTFOT temperature could be determined by equiviscous principle. From limited data, O. 25 Pa ~ s is tentatively proposed as critical viscosity for PMA, but still more work is necessary to validate this. Given the fact that equiviscous principle is seldom used in field practice, a simple approach was proposed： 173 ℃ is used for RTFOT of PG70 PMAs （grading herein from un-aged asphalts） , while 178 ℃ is for PMAs of PG76 or PG82 and 20 ℃ higher than standard 163 ℃ is necessary for PG 88 or stiffer PMAs.

Primary choriocarcinoma of uterine cervix treated by uterine artery drug pouring and embolism: one case report

Primary choriocarcinoma of the uterine cervix (PCC) is an extremely rare disease. The conventional treatment of PCC is a combination of hysterectomy and chemotherapy. We present one rare case proved by cervical biopsy. The patient was an 36-year-old Chinese woman with irregular vaginal bleeding for 60 days. A cervical tumoral mass was seen in the pelvic examination and biopsy revealed active hyperplasia of trophoblastic cell. Because of massive vaginal haemorrhage, the patient accepted uterine artery drug pouring and embolism emergently. This management had gained a satisfactory effect. Thus, Uterine artery drug pouring and embolism is one new and effective weapon for PCC, which can preserve the patient’s productive ability.