基于紫外光谱-惩罚岭型线性判别对STR基因座分型研究

目的:结合紫外光谱(UV-s)和惩罚岭型线性判别(PRLDA)模式识别方法建立短串联重复序列(STR)的基因分型方法。方法:以D16S539基因座的9-9,12-13两种基因型为研究对象,研究包含该多态性位点的DNA片段的聚合酶链反应(PCR)扩增条件和紫外检测条件,建立标准化扩增条件和检测条件,以此获得基因分型的标准物及其标准UV-s。以标准光谱为识别变量,建立了9-9与12-13基因型的PRLDA判别模型。结果:所建立的PRLDA模型有较大的类间距和较小的类内距,表明模型具有良好的稳健性,且预测样本均分布在校正样本集的范围之内,对预测样本也表现出了极强的判别能力。结论:该方法不需任何检测前处理,而只需一步PCR扩增和UV-s检测即可实现STR的基因分型,具有简单、快速、低成本等优点。     

论高等教育价值观的构建

随着全球化浪潮的推进与知识经济时代的到来,高等教育面临着越来越多的挑战。在这一新时代,我国高等教育应如何保持自身的健康发展。通过对高等教育价值观的分析与构建,明确高等教育的发展方向,稳步推进社会主义现代化建设进程。     

Tetrazolium violet induces apoptosis via caspases-8, -9 activation and Fas/FasL up-regulation in Rat C6 glioma cells

Tetrazolium violet (TV), a tetrazolium salt, was synthesized as a novel and potent anticancer agent with a broad spectrum of anticancer activity against many cancer cells. A previous study showed that tetrazolium violet inhibited cell growth, and induced cell cycle arrest and apoptosis in C6 Rat glioma cells. It also showed that treatment of cells with TV for 24 h resulted in a dramatic up-regulation of p53, and an increase in the activity of caspase-3, accompanied with a significant increase of Bax/Bcl-2 ratio. In this study, we further investigated which Fas/FasL and caspase were activated by TV during the apoptosis. Annexin-V-propidium iodide (PI) binding assay and nucleosome ELISA assay further indicated that TV induced a typical apoptosis, in a time-dose-dependent manner. The data showed that the activity of Fas/FasL and caspase-8 and -9 were significantly enhanced by the compound, which suggested that TV might be used as a Fas/FasL and caspases promoter to initiate brain cancer cell apoptosis.     

Broken bioceramic used in a computer-assisted reconstruction of the frontal skull bone

We report a complication occurring after the use of a bioceramic material for a three-dimensional reconstructive cranioplasty. A patient who had a satisfactory aesthetic result after frontal skull bone reconstruction with bioceramic injured his head after falling out of bed. The bioceramic material fragmented and the three fragments migrated over each other to form a lump. The bioceramic material had to be surgically removed. Care must be taken when using the fragile bioceramic material for reconstructive purposes, especially when patients are at risk of frequent falls.     

巫山淫羊藿悬浮培养细胞的生长特性研究

目的考察巫山淫羊藿悬浮培养细胞的生长特性,为巫山淫羊藿资源利用提供参考。方法选用悬浮培养所获得的均匀悬浮培养细胞为研究对象,在光照条件下进行悬浮培养,每隔3 d取样,测定相关的生理生化指标。结果巫山淫羊藿悬浮细胞的生长曲线呈"S"型,培养基中蔗糖、磷酸盐、硝酸盐、铵盐量均呈急剧下降趋势,最后变化趋于平缓,细胞合成黄酮最佳光照时间为每天12 h,黄酮合成量为27.854 82 mg/L。结论巫山淫羊藿细胞生长特性的研究为其大规模悬浮培养生产天然活性成分奠定了基础。     

DNA修复酶MGMT的研究进展

O^6-甲基鸟嘌呤-DNA-甲基转移酶（O^6-methylguanine-DNA methyltransferase,MGMT）是一种高效的DNA直接修复酶,能修复烷化剂所致的DNA损伤。该酶的结构、功能的异常与肿瘤的发生及特征都有密切关系。本文就近几年对DNA修复酶MGMT的研究和它在肿瘤诊断与治疗中的应用作一综述。     

Habitual intakes of sugar-sweetened beverages associated with gut microbiota-related metabolites and metabolic health outcomes in young Chinese adults

Background and aimsReducing consumption of sugar-sweetened beverages (SSBs) is a global public health priority because of their limited nutritional value and associations with increased risk of obesity and metabolic diseases. Gut microbiota-related metabolites emerged as quintessential effectors that may mediate impacts of dietary exposures on the modulation of host commensal microbiome and physiological status.Methods and resultsThis study assessed the associations among SSBs, circulating microbial metabolites, and gut microbiota–host co-metabolites, as well as metabolic health outcomes in young Chinese adults (n = 86), from the Carbohydrate Alternatives and Metabolic Phenotypes study in Shaanxi Province. Five principal component analysis-derived beverage drinking patterns were determined on self-reported SSB intakes, which were to a varying degree associated with 143 plasma levels of gut microbiota-related metabolites profiled by untargeted metabolomics. Moreover, carbonated beverages, fruit juice, energy drinks, and bubble tea exhibited positive associations with obesity-related markers and blood lipids, which were further validated in an independent cohort of 16,851 participants from the Regional Ethnic Cohort Study in Northwest China in Shaanxi Province. In contrast, presweetened coffee was negatively associated with the obesity-related traits. A total of 79 metabolites were associated with both SSBs and metabolic markers, particularly obesity markers. Pathway enrichment analysis identified the branched-chain amino acid catabolism and aminoacyl-tRNA biosynthesis as linking SSB intake with metabolic health outcomes.ConclusionOur findings demonstrate the associations between habitual intakes of SSBs and several metabolic markers relevant to noncommunicable diseases, and highlight the critical involvement of gut microbiota-related metabolites in mediating such associations.     

地方师范大学区域特色发展的实践案例

在高等教育大众化背景下,伴随着我国经济结构调整,产业优化升级,以及高等教育国际化、市场化发展,教师教育处在一个深刻转型期。坚持内涵建设、特色发展,是地方师范大学迎接挑战、寻找出路、谋求发展的战略选择。地方师范大学必须统筹区域,扎根本土,服务地方,以特色发展,质量提升,促进其发展观念和方式的全面转化;以本土化、个性化、特色化,推进其开放化、现代化、国际化。