早期心肌缺血猝死心肌NF-κB p65的表达研究

目的探讨核因子NF-κBp65（NF-κB p65）在心肌早期缺血猝死后诊断中的法医学价值。方法将收集的案例心肌蜡块分为3组：正常对照组（3例）、早期心肌缺血组（14例）、心肌梗死组（8例）,采用免疫组织化学技术（SP法）,观察猝死心肌内NF-κBp65的表达情况,并对其结果进行半定量分析。结果早期心肌缺血组和心肌梗死组的心肌细胞胞浆内及细胞核内均出现NF-κBp65的表达,且早期心肌缺血组与心肌梗死组表达强度无差异。结论NF-κBp65可以作为早期心肌缺血猝死的一个辅助诊断指标。     

大鼠局灶性脑挫伤后p35及p25的表达变化

目的探讨大鼠局灶性脑挫伤后脑中p35和p25表达变化的时间规律性,为脑损伤时间推断提供更多依据。方法50只成年雄性SD大鼠随机分为损伤即刻(0h)组,伤后6h、12h、24h、3d、5d、7d、10d组,同时设立正常组和假手术组,每组5只,建立大鼠局灶性脑挫伤模型,运用HE、免疫组织化学染色及Western印迹法等方法检测损伤不同时间后损伤周边区脑组织p35及p25的蛋白表达。结果正常组和假手术组蛋白表达较多p35和少量p25。在局部脑挫伤后,p35随时间呈现单峰变化,p25随时间呈现双峰变化。结论大鼠局灶性脑挫伤后p35和p25的表达呈现不同规律性并有较好的时间相关性,可为脑损伤时间推断提供较好的依据。     

牛病毒性腹泻病毒p80基因的分段表达及其抗原性分析

为建立以重组p80蛋白为抗原的牛病毒性腹泻(BVD)鉴别诊断ELISA方法,采用PCR方法克隆了BVDV p80基因的A、B、C三段基因片段,分别连接到原核表达载体pGEX-6P1上,获得了重组质粒pGEX-6P1-p80A、pGEX-6P1-p80B和pGEX-6P1-p80C,将其分别转化感受态菌Rosetta和BL21,经1.0 mmol/L的IPTG诱导,分别得到大小为60、47和51 ku的目的蛋白。经Western-blotting分析,3个目的蛋白中,只有p80B(289~477 aa)基因片段所表达的融合蛋白能与BVDV阳性血清反应,表明p80蛋白的免疫优势区域集中在此部位。该融合蛋白可以作为诊断抗原用于建立ELISA诊断方法。     

Surface Modification for the Collection and Identification of Fingerprints and Colorimetric Detection of Urea Nitrate

Glass surfaces were modified with a combination of dyes and reagents to allow for the potential simultaneous recording of a detailed fingerprint and the detection of the explosive urea nitrate (UN), as a proof of principle of surface modification for simultaneous linking of identity to manipulation of explosives. By coating microscope slides with 9,10‐diphenylanthracene (DPA), p‐dimethylaminobenzaldehyde (p‐DMAB) and p‐dimethylaminocinnamaldehyde (p‐DMAC), a colorimetric change was observed in the presence of UN, while revealing a fingerprint with enough resolution to isolate at least 10 minutiae. This is the first step in creating point‐of‐care devices capable of detecting low concentrations of explosives and drug metabolites and connecting them to a fingerprint.     

电针夹脊穴通过磷酸化p38 MAPK信号通路对大鼠炎性痛阈的影响

目的 观察电针夹脊穴对炎性疼痛大鼠痛阈的影响,从信号转导的角度探讨针灸镇痛的机制. 方法 采用经典的完全弗氏佐剂性关节炎疼痛模型,观测电针刺激对大鼠痛阈的影响,采用免疫组织化学法测定各组大鼠背根神经节(doral root ganglion, DRG)内磷酸化p38丝裂原活化蛋白激酶(phosphorylation-p38 mitogen activated protein kinase, p-p38 MAPK)的含量,采用蛋白印迹法测定DRG内辣椒素受体1(vanilloid receptor 1, VR1)含量. 结果 电针刺激影响大鼠DRG内p-p38 MAPK和VR1含量,并可提高炎性疼痛大鼠的痛阈,降低p38 MAPK受体阻断剂提高后大鼠的痛阈. 结论 电针影响炎性疼痛的机制与p38 MAPK-VR1信号通路密切相关.     

The effects of four different solvent vapours on the restoration of obliterated stamp markings from five different wooden surfaces

The stamp markings on wooden surfaces, which are placed on trees and products including antiques, indicate the status of trees and involve identifying data regarding the products. Such markings are obliterated either to facilitate illegal logging or to conceal product information. Despite the wide literature on the restoration of obliterated characters on metal and polymer surfaces, the recovery of defaced characters on wooden surfaces appears to be understudied. Several reference texts in the forensic marks’ examination literature suggest that water, water vapor, and alkaline solutions are useful in restoring the abraded markings on the wood. Since there does not seem to be any experimental study proving such success, this study aimed to fill this gap. This study conducted experimental research by using water, ethanol, ammonia, and chloroform to recover the scraped characters on samples obtained from walnut, beech, spruce, oak, and cedar trees. The cold-stamped characters, which were defaced at varying depths, were restored using vapor and liquid phases of four solvents. While the vapor phases of water, ethanol, and ammonia yielded good outcomes on all types of wooden surfaces, the liquid phases did not seem to be useful in the revisualization process. The response of the vapors, which varied between 62 and 220 s, depended on the type of wood. The restoration technique developed in this research offers the possibility of on-site usage, easy application, utilization of low-cost solvents, rapid recovery, and effectiveness on various wooden surfaces. Overall, the restoration methodology used in this research appears to be fruitful in retrieving identifying information on wooden samples.