Research progress of Coxsackievirus A21 / 公共卫生与预防医学

Enteroviruses are currently divided into groups A to J, among which groups A to D can infect human body. People infected with enterovirus can present invisible infection, which can lead to different clinical symptoms when the immunity is weakened. Among the diseases caused by enteroviruses, hand-foot-mouth disease, herpetic angina, and encephalitis have attracted much attention. Coxsackie virus A21 (CV-A21) belongs to enterovirus C group, which mainly causes acute respiratory tract infection. According to research reports, CV-A21 infection has been found in many countries and regions, and the infection scope is gradually expanding. In the past two years, it has been found that CV-A21 infection has a significant association with the outbreak of acute respiratory tract infection. This indicates that acute respiratory tract infection caused by CV-A21 infection may have potential public health problems. However, there are few studies on the epidemiology and pathogenic mechanism of this virus, and most of the studies are on the mechanism of its oncolytic action on specific malignant tumors. Therefore, in this paper, the structural characteristics, epidemiological characteristics, infection mechanism and oncolytic effects of CV-A21 are reviewed to provide relevant clues for the understanding and exploration of CV-A21.

Protective effects of total flavonoids extraction from ficus lacor leaves on A549 cells / 重庆医学

Objective To investigate the extraction method of total flavonoids from the leaves of ficus lacor and the protec tive effects of extraction on the cellular damage to provide a basis for the research on the phamaceutical value of ficus lacor leaves.Methods The ethanol extraction method was adopted to extract the total flavonoids in the leaves of ficus lacor and the extraction efficiency was calculated with rutin as the standard.The rotenone induced human lung adenocarcinoma cellular damage served as the model,then the influencesof the extraction on the cellular viability,cellular morphology,production of reactive oxygen species (ROS) and apoptosis were researched.Results The extraction efficiency of total flavonoids in the leaves of ficus lacor by 60％ ethanol was 5.02％;the extraction at the concentration of 32 mg/L could significantly inhibit the decrease of cell viability,cellular shape change,ROS production and apoptosis of A549 cells induced by 100μg/L rotenone.Conclusion The ethanol extraction method can be used to extract the total flavonoids in the leaves of ficus lacor and the extraction has the protective effects on the A549 cellular dam age induced by rotenone,the leaves of ficus lacor have the potential for further researching its pharmaceutical value.

Study of molecular mechanism of Rheum offcinale against Yersinia pestis / 中国中药杂志

To investigate molecular mechanism of traditional Chinese medicine Rheum offcinale against Yersinia pestis, whole genome DNA microarray that contains 4005 annotated genes of Y. pestis was used. The minimal inhibition concentration (MIC) of R. offcinale extract against Y. pestis was determined by liquid dilution method. The gene expression profile of Y. pestis was performed after exposured to R. offcinale extract at a concentration of 10 X MIC for 30 and 60 minutes. The total RNA extracted and purified from Y. pestis were reverse-transcribed to cDNA and labeled by Cy3-Cy5 dye. The labeled probes were hybridized to the microarray and the results were obtained by a laser scanner and analyzed by the SAM software. The microarray data was confirmed by RT-PCR. The platform of the DNA microarray-based bacteria transcriptional profiling was eshtablished. The results revealed general gene expression changes of Y. pestis were a global phenomenon. Down-regulation of genes encoding proteins involved in ribosome protein synthesis was a remarkable change. Genes encoding cell envelope and transport/binding proteins were the major changed genes of the Y. pestis in response to R. offcinale.

Exploration of introducing conditional-opening experiment in experiment teaching of hygiene analysis / 中华医学教育探索杂志

The article explored the feasibility,implementation procedure,effects evaluation,existing problems and future improvements on introducing conditional-opening-experiment(COE) in experiment teaching of hygiene analysis.The results indicated that COE could culture the practical operation ability,cooperation ability,overall situation consciousness and responsibility of students in many ways,although it still needed improvements.It promoted students'study enthusiasm,initiative consciousness and their participation and strengthened the harmony relationships between students and teachers.

Characteristics about tolerance and reduction of bacteria CQMUXH-1 to Hexavalent Chromium / 重庆医科大学学报

Objective:Toresearch the characteristics about resistance and reduction on Cr(Ⅵ)ofCQMUXH-1. Methods:Simulating the environment of C(rⅥ)in the lab. Cultivating bacteria under different condition(reaction time,pH,temperature,C(rⅥ)concentration, other pollutants)and determining the growth quantity of bacteria and(or)concentration of residual Cr(Ⅵ)to evaluate the ability for tolerating and reducing C(rⅥ)of CQMUXH-1. Results:5~20 h is the logarithmic growth phase of CQMUXH-1 when cultured in 30℃ and vibration conditions. The resistant ability to Cr(Ⅵ)of CQMUXH-1 is better than the E. coli DH5? control bacteria. The reduction rate of CQMUXH-1 to 100 mg/L Cr(Ⅵ)is 73% when cultured in 37℃,200 r/min after 84 h. The weak base environment has bad effects to the growth of CQMUXH-1 and 37℃ can speed up its growth. Hg2+,As3+ can obviously restrain the growth of CQMUXH-1 and Cu2+ can promote its growth. Conclusion:CQMUXH-1 has strong ability to resist and reduce Cr (Ⅵ),which can be effectively used in the bioremediation of waste water with Cr(Ⅵ)pollution.