电针联合康复训练对局灶性脑缺血大鼠NLRP3炎症通路的影响

目的 观察电针联合康复训练对局灶性脑缺血大鼠NOD样受体蛋白3(NOD-like receptor family pyrin domain containing 3,NLRP3)炎症通路的影响,探讨电针联合康复训练抑制大鼠脑缺血炎症反应的作用机制。方法 采用线栓法制备大脑中动脉闭塞(middle cerebral artery occlusion, MCAO)模型,将45只SD大鼠随机分为假手术组、模型组、电针组、康复训练组、电针联合康复训练组,每组9只。假手术组和模型组不予治疗,电针组电针大鼠“百会”“大椎”穴,康复训练组进行导向性跑台训练,电针联合康复训练组同时予以电针和康复训练干预。比较模型复制完成4 h、7 d后大鼠神经功能评分;苏木精-伊红染色观察缺血侧皮质病理学变化;酶联免疫吸附法检测缺血侧皮质白细胞介素-1β(interleukin-1β, IL-1β)、白细胞介素-18(interleukin-18, IL-18)水平;免疫荧光法检测缺血侧皮质中NLRP3、Caspase-1阳性表达水平;析因分析NLRP3、Caspase-1阳性表达水平和IL-1β、IL-18水平的交...     

黄连生物碱对HEK293-OATP1B3细胞转运黄芩黄酮活性的影响

目的 探究黄连生物碱对HEK293-OATP1B3介导的黄芩苷、汉黄芩苷转运的影响。方法 采用稳定转染OATP1B3的HEK293细胞,以黄芩苷和汉黄芩苷为底物,小檗碱、药根碱、黄连碱、盐酸巴马汀作为抑制剂,进行药物转运实验,并进行含量测定。结果 抑制剂组的黄芩苷、汉黄芩苷摄取量均低于对照组。结论 黄连生物碱可抑制OATP1B3对黄芩苷和汉黄芩苷的转运。     

柚皮素- 铜络合物对Hep- G2细胞增殖与凋亡的影响

目的 观察柚皮素-铜络合物在体外对人肝癌Hep-G2细胞增殖与凋亡的影响,探究其作用机制。方法 将不同浓度柚皮素-铜络合物作用于体外培养的Hep-G2细胞,采用甲基噻唑基四唑法检测细胞生长抑制率;荧光显微镜下观察柚皮素-铜络合物对DAPI染色的Hep-G2细胞凋亡的影响;应用流式细胞仪检测凋亡率; Western blot法检测细胞中Bcl-2、Bax和Caspase-3蛋白表达的变化。结果 柚皮素-铜络合物可显著地抑制Hep-G2细胞增殖,且在一定的范围内呈浓度依赖性。荧光显微镜下观察显示,柚皮素-铜络合物作用的Hep-G2细胞出现显著的凋亡特征,呈剂量依赖性地增加细胞凋亡率。柚皮素-铜络合物可上调Hep-G2细胞中Bax、Caspase-3蛋白的表达,抑制Bcl-2蛋白的表达,且呈一定的剂量依赖性。结论 柚皮素-铜络合物可抑制Hep-G2细胞的增殖并诱导其凋亡,其作用机制可能与上调Bax、Caspase-3蛋白的表达,抑制Bcl-2蛋白的表达有关。     

Identification of Carbonates as Additives in Pressure‐Sensitive Adhesive Tape Substrate with Fourier Transform Infrared Spectroscopy (FTIR) and Its Application in Three Explosive Cases

Abstract: Pressure‐sensitive tape is often used to bind explosive devices. It can become important trace evidence in many cases. Three types of calcium carbonate (heavy, light, and active CaCO₃), which were widely used as additives in pressure‐sensitive tape substrate, were analyzed with Fourier transform infrared spectroscopy (FTIR) in this study. A Spectrum GX 2000 system with a diamond anvil cell and a deuterated triglycine sulfate detector was employed for IR observation. Background was subtracted for every measurement, and triplicate tests were performed. Differences in positions of main peaks and the corresponding functional groups were investigated. Heavy CaCO₃ could be identified from the two absorptions near 873 and 855/cm, while light CaCO₃ only has one peak near 873/cm because of the low content of aragonite. Active CaCO₃ could be identified from the absorptions in the 2800–2900/cm region because of the existence of organic compounds. Tiny but indicative changes in the 878–853/cm region were found in the spectra of CaCO₃ with different content of aragonite and calcite. CaCO₃ in pressure‐sensitive tape, which cannot be differentiated by scanning electron microscope/energy dispersive X‐ray spectrometer and thermal analysis, can be easily identified using FTIR. The findings were successfully applied to three specific explosive cases and would be helpful in finding the possible source of explosive devices in future cases.     

Lipidic compounds found in soils surrounding human decomposing bodies and its use in forensic investigations – A narrative review

Following decomposition of a human body, a variety of decomposition products, such as lipids, are released into the surrounding environment, e.g. soils. The long-lasting preservation in soils and their high diagnostic potential have been neglected in forensic research. Furthermore, little is known about the preservation, chemical transformation, or degradation of those human derived lipids in soils. To date, several studies identified various lipids such as long-chain free fatty acids and steroids in soils that contained decomposition fluids. Those lipids are preserved in soils over time and could serve as markers of human decomposition in forensic investigations, e.g. for estimating the post-mortem interval or identifying the burial location of a human body. Therefore, this review focuses on the current literature regarding fatty acid and steroid that have been detected in soils and associated with human body decomposition. After a short introduction about human decomposition processes, this review summarises fatty acid and steroid analysis applied in current case studies and studies related to taphonomic research. This review provides an overview of the available studies that have used fatty acids and steroids as identifiers of human decomposition fluid in soils in a forensic context and discusses the potential for developing this innovative field of research with direct application in a forensic context.