多巴胺受体基因遗传多态性与精神分裂症的关联及法医学意义

精神分裂症是一种常见的多因子参与的复杂疾病,司法精神病学鉴定中对精神分裂症的涉及甚多,但无有效的生物学鉴定指标。研究表明,多巴胺神经递质功能紊乱可能在精神分裂症的发生及其主要症状中发挥重要作用。本文综述了多巴胺受体的分类、基因结构以及近年来关于多巴胺受体基因遗传多态性与精神分裂症的关联研究及其法医学意义。     

快速溶剂萃取-气相色谱-质谱联用法分析血液中的农药

目的：建立生物检材血液中农药的快速溶剂萃取（accelerated solvent extraction,ASE）法。方法通过优化ASE萃取条件,考察萃取温度、时间和萃取剂对回收率的影响,提取血液中的农药进行气相色谱-质谱联用（GC/MS）法定性定量分析。结果血液中8种农药的平均回收率在70.6%~92.4%,变异系数小于5.0%,8种农药在0.5~5.0μg/mL的浓度范围内线性良好。结论该方法具有操作简便快捷、回收率高、重现性好等特点,可用于农药的提取检验。     

中小城镇发展问题的反思与转变

分析我国城市发展“小城镇，大问题”、“小城镇，大发展”、“小城镇，大战略”转变历程，反思中小城镇发展问题的战略路径，在新型城镇化背景下，重新回归到研究增强中小城镇发展问题上。依据城镇规模等级体系理论，研究得出了中小城镇建设在城镇体系结构和城镇化建设中的战略地位作用，提出了加快中小城镇建设发展的思路，地方政府要优化公共服务，统筹城发乡展，更好引导发挥企业和居民“以足投票”的作用，为完善城市体系结构和城市可持续发展提供新动力。     

农村协商民主制度化发展的现实形态和优化路径

在党中央和国务院顶层设计的引领下,我国各地农村协商民主实践蓬勃发展起来,协商民主运行机制初步形成,协商民主制度框架初步建立。根据创新程度不同可以将我国各地农村协商民主实践模式分为制度原创型、制度改良型和制度嵌入型三种形态。虽然我国农村协商民主已经迈入制度化发展轨道,但大都处于起步阶段,制度化发展程度较低,"政绩式协商""低水平协商""随意性协商"等现象严重制约着农村协商民主实践的可持续发展。加强顶层设计,鼓励基层试点,提升农村干部和群众对协商民主的制度认同,持续推进协商民主制度创新,是进一步推动农村协商民主制度化发展的当务之急。     

The impact of fentanyl on DUIDs and traffic fatalities: Blood and oral fluid data

Fentanyl has emerged as the most prolific drug in the ongoing opioid epidemic and has greatly impacted traffic safety in recent years. This study aimed to evaluate fentanyl prevalence and concentrations in blood and oral fluid in driving under the influence of drugs (DUID) cases in three different regions (i.e., Alabama, Orange County, CA, and Houston, TX) from 2017 to 2022. Furthermore, traffic fatalities were evaluated for Alabama and Orange County, CA. Fentanyl positivity in DUID and traffic fatalities increased for most years in this study. In Alabama, the prevalence of fentanyl DUID cases increased 4-fold in 2022 compared to 2017. Orange County's increase from 2017 to 2022 was 14-fold. In Houston, the increase was approximately 2-fold from 2019 to 2022. The greatest increase for all laboratories coincided with the start of the COVID-19 pandemic. In 2022, the median fentanyl DUID blood concentrations were 4.7, 11, and 4.7 ng/mL in Alabama, Orange County, and Houston, respectively. Most fentanyl cases were polydrug cases (≥90%). Methamphetamine, THC, and alprazolam were the most frequently detected drugs in combination with fentanyl. Alabama has collected oral fluid and blood in DUID cases since 2018. The detection of fentanyl in oral fluid was comparable to blood. However, 59% and 8.7% of fentanyl-positive cases had concentrations of >20 ng/mL in oral fluid and blood, respectively. Therefore, oral fluid as an alternative or supplemental specimen to blood is an attractive approach for fentanyl in DUID cases. This study contributes to understanding recent fentanyl trends and their impact on traffic safety.     

Internal validation of reduced PCR reaction volume of the Qiagen Investigator® Argus X-12 QS Kit from blood samples on FTA cards

The onus of proof in criminal cases is beyond any reasonable doubt, and the issue on the lack of complete internal validation data can be manipulated when it comes to justifying the validity and reliability of the X-chromosomal short tandem repeats analysis for court representation. Therefore, this research evaluated the efficiency of the optimized 60% reduced volumes for polymerase chain reaction (PCR) amplification using the Qiagen Investigator® Argus X-12 QS Kit, as well as the capillary electrophoresis (CE) sample preparation for blood samples on Flinder's Technology Associates (FTA) cards. Good-quality DNA profile (3000–12,000 RFU) from the purified blood sample on FTA card (1.2 mm) were obtained using the optimized PCR (10.0 μL of PCR reaction volume and 21 cycles) and CE (9.0 μL Hi-Di™ Formamide and 0.3 μL DNA Size Standard 550 [BTO] and 27 s injection time) conditions. The analytical and stochastic thresholds were 100 and 200 RFU, respectively. Hence, the internal validation data supported the use of the optimized 60% reduced PCR amplification reaction volume of the Qiagen Investigator® Argus X-12 QS Kit as well as the CE sample preparation for producing reliable DNA profiles that comply with the quality assurance standards for forensic DNA testing laboratories, while optimizing the analytical cost.     

Improving Luminol Blood Detection in Forensics

The aim of this study was to develop chemical improvements to the original Weber protocol, in order to increase the intensity and time length of light emission and to eliminate false‐positive reactions. The intensity and duration of light were measured on serial blood dilutions using a plate reader chemiluminometer. Blood stains of various concentrations were impregnated in pure cellulose, dried, and luminol solution was added with/without the potential enhancers. An in silico study was also conducted, aiming to demonstrate the enhancing mechanism of hemoglobin denaturation using 8 M urea. The luminol blood detection test revealed important improvements after urea pretreatment or in the presence of monochloro‐triazinyl‐β‐cyclodextrin. This approach also eliminated the false‐positive reaction from sodium hypochlorite. These improvements could provide a higher sensitivity under particular circumstances such as old or washed blood stains, leading to a better localization for further DNA typing and higher quality photographic analysis.     

外伤性癫痫及其法医学评定进展

外伤性癫痫(post traumatic epilepsy,PTE)是指颅脑损伤后的癫痫性发作,影像学检查可见器质性病变,脑电图检查可见异常脑电波与颅脑损伤部位一致。外伤后癫痫发生率低,案例报道较少,患者易夸大病情,给法医学鉴定增加难度。本文就外伤性癫痫流行病学、发病机制、临床治疗、法医学鉴定等方面的现状进行综述。     

浅论对侦查行为的法律监督

我国现行侦查程序缺乏有效的法律监督．检察院对侦查程序的提前介入没有立法上的保障,法院无权对侦查机关的行为进行审查和控制,犯罪嫌疑人无权与侦查机关进行平等的对话和抗争。因此,从基本理念和基本结构上对我国侦查程序进行反思,有必要限制侦查机关的权力,保护被追诉方的权利,并赋予法院对侦查行为的司法审查权。     

强奸罪若干新问题研究

强奸罪的犯罪客体包括奸淫幼女的客体都是贞操权而不是幼女的身心健康。强奸罪的客观方面应当随社会生活的变化而变化,包括男性之间的强奸行为、女性之间使用器具的强奸行为、以及女性强制男性实施的性行为等方式。强奸罪与强制猥亵罪区别的关键在于强奸是插入被害人的性器、肛门,而强制猥亵罪是接触被害人的性器、肛门或者女性被害人的乳房。