Detection of saliva traces using test strips

The test strip Rapignost-Amylase (Behring) for the rapid determination of alpha-amylase in the urine is also suitable for the determination of salivary amylase in stains stored up to 6 weeks at room temperature. The stains are extracted with physiological saline (extraction time 30 min), then the application zone of the strip is wetted with the extract. Positive amylase-reaction is recognised as a reddish-violet colouration of the reaction zone. Biological stains with low amylase concentrations (urine semen, vaginal secretion, mucus) react amylase negative. The method is uncomplicated and can be completed within 30 min. The test strips are easily available and stable during storage. Therefore the determination of saliva with test strips should be preferred to the clinical methods if the storage times of the stain are not longer than 4-6 weeks. It is a suitable procedure to determine salivary stains for use in forensic biology.     

广东汉族人群H19基因上游差异甲基化区SNP

目的调查广东汉族人群中H19基因上游差异甲基化区(differentially methylated region,DMR)的单核苷酸多态性(SNP)及单倍型。方法应用PIA分型法,以限制性内切酶Mcr BC、HpaⅡ消化基因组DNA分别获得个体单亲源DNA模板链,经测序,分别获得个体H19基因上游DMR单亲源SNP等位基因、基因型及单倍型数据。结果共检出13个SNP(rs10840167、rs2525883、rs12417375、rs4930101、rs2525882、rs2735970、rs2735971、rs11042170、rs2735972、rs10732516、rs2071094、rs2107425、rs4930098)及1个突变点(g7351c)。所有位点经统计学分析均符合Hardy-Weinberg平衡定律(P0.05)。除rs12417375位点DP值为0.279,其余12个SNP DP值在0.446~0.614;g7351c突变点DP值为0.013,提示为南方汉族民族特异性位点。共检出8种单倍型(命名为单倍型1~8),其中有3种为新发现的单倍型,其DP、PIC、PE及H分别为0.891、0.714、0.524和0.758。结论 PIA分型法获得的H19基因上游DMR SNP位点及其单倍型遗传标记系统具有较高的鉴别能力,在法医学鉴定中具有较好的实用价值。     

Patrolling Public Schools: The Impact of Funding for School Police on Student Discipline and Long‐term Education Outcomes

As police officers have become increasingly common in U.S. public schools, their role in school discipline has often expanded. While there is growing public debate about the consequences of police presence in schools, there is scant evidence of the impact of police on student discipline and academic outcomes. This paper provides the first quasi‐experimental estimate of funding for school police on student outcomes, leveraging variation in federal Community Oriented Policing Services (COPS) grants. Exploiting detailed data on over 2.5 million students in Texas, I find that federal grants for police in schools increase middle school discipline rates by 6 percent. The rise in discipline is driven by sanctions for low‐level offenses or school code of conduct violations. Further, I find that Black students experience the largest increases in discipline. I also find that exposure to a three‐year federal grant for school police is associated with a 2.5 percent decrease in high school graduation rates and a 4 percent decrease in college enrollment rates.     

Collection and direct amplification methods using the GlobalFiler™ kit for DNA recovered from common pipe bomb substrates

When analyzing DNA from exploded pipe bombs, quantities are often in trace amounts, making DNA typing extremely difficult. Amplifying minute amounts of DNA can cause stochastic effects resulting in partial or uninterpretable profiles. Therefore, the initial DNA collection from “touch” evidence must be optimized to maximize the amount of DNA available for analysis.This proof-of-concept study evaluated two different swab types with two direct amplification strategies to identify the most effective method for recovering DNA from common pipe bomb substrates. PVC and steel pipes, electrical tape, and copper wire spiked with epithelial cells were swabbed with cotton or microFLOQ® Direct Swabs and amplified directly or via a pre-treatment prior to STR amplification.Not only was the microFLOQ® Direct Swab protocol the quickest method with the least risk of contamination, but in combination with direct amplification, the microFLOQ® Direct Swabs also generated the most complete STR profiles.     

雄黄主要成分As2S2通过“ANP32A-INHAT-H3乙酰化”轴抑制三阴性乳腺癌细胞增殖、迁移的表观遗传调控机制

目的 探究雄黄主要成分二硫化二砷（As2S2）对三阴性乳腺癌（triple negative breast cancer,TNBC）的作用及表观遗传调控机制。方法 〖JP2〗采用CCK-8、平板克隆形成和细胞划痕实验探究As2S2对人正常乳腺上皮细胞MCF-10A及TNBC细胞增殖和迁移的影响;4D-label free定量蛋白质组学分析挖掘As2S2抗TNBC的潜在干预靶点酸性核磷蛋白家族成员32A（acidic nuclear phosphoprotein family member 32A,ANP32A）;慢病毒感染法构建ANP32A过表达敲低细胞株,探究潜在靶点ANP32A对As2S2抗TNBC作用的影响;蛋白质免疫共沉淀和Western blot实验探究As2S2是否通过ANP32A调控TNBC细胞H3乙酰化。结果 As2S2对人正常乳腺上皮细胞MCF-10A影响甚微,但显著抑制TNBC细胞增殖和迁移,且呈剂量依赖性;4D-lable free定量蛋白质组学分析结果显示,促癌因子ANP32A被As2S2显著下调,且ANP32A表达影响As2S2在TNBC中的抗增殖和迁移效果。As2S2能下调ANP32A的蛋白水平,抑制乙酰转移酶抑制剂复合物亚基的招募,增加H3乙酰化水平。结论 As2S2通过下调ANP32A蛋白调控TNBC细胞中H3乙酰化,抑制TNBC细胞增殖和迁移。     

中西医结合治疗甲型H1N1流感26例

目的 观察痰热清注射液联合奥司他韦治疗甲型H1N1流感的临床疗效.方法 将确诊的50例甲型H1N1流感患者随机分为治疗组与对照组,两组均采用奥司他韦抗病毒治疗,治疗组加用痰热清注射液静脉滴注,治疗3～10 d.观察并比较两组咳嗽消失时间及临床疗效.结果 治疗组和对照组总有效率分别为80.77%、54.17%,两组临床总...