中缝背核的形态及其在痛觉调制中的作用

中缝背核(Nucleus Raphe Dorsalis,DR)含有大量5-羟色胺(5-HT)能神经元、多巴胺(DA)能、γ-氨基丁酸(GABA)能以及其它肽能神经元,与中枢许多部位有纤维联系;DR 在痛觉调制中     

ELECTRICAL STIMULATION OF HYPOTHALAMIC ARCUATE NUCLEUS (ARC) CAN CHANGE RESPONSES TO ELECTROACUPUNCTURE OF NEURONS OF DORSAL RAPHE NUCLEUS (DR) AND LOCUS COERULEUS (LC)

116 DR units and 104 LC units were extraccllul-arly recorded in 111 paralyzed and artificially ventilat-ed rats.The main results were as follows:Both DRand LC units exhibited excitatory,inhibitory or noresponse to ARC stimulation or electroacupuncture(EA) on Zusanli (St 36) and Sanyinjiao (Sp 6).After ARC stimulation,the number of EA-excitedDR units and EA-inhibited LC units were increasedsignificantly.Further,the post-EA discharge ratewas increased in DR units and decreased in LC units.The above-mentioned reciprocal effects of ARC sti-mulation on DR and LC units could be simultaneou-sly observed in the same rat.Naloxone (1 mg/kgi.p.) increased the spontaneous discharges of DR andLC units and reversed the effects of ARC stimula-tion.The results indicated that under physiologicalcondition the endogenous opiate-like substances mayhave a tonic inhibitory effect on the DR and LCneurons,and that ARC might participate in the EAanalgesia via changing the responses of DR and LCneurons to EA,in which opiate-like substances (pro-bably,β-endorphin) are involved.     

微波消解-原子吸收分光光度法、原子荧光分光光度法测定土壤中的铜锌铅镉铬砷汞

目的：探索用微波消解对土壤中金属进行快速消解预处理的可能性。方法：微波消解土壤样品，原子吸收分光光度法、原子荧光分光光度法测定消解液中的微量元素铜锌铅镉铬砷汞含量。结果：测定值均在标样的不确定度范围内，相对标准偏差均小于8％。结论：本法快速方便、准确度与精密度均令人满意。     

经皮肤神经电刺激的镇痛疗效观察

本文采用经皮肤神经电刺激(TENS)仪治疗413例急、慢性痛症。结果表明TENS疗法的优良率为69.7％,有效率为88.8％。对不同类型的物理疗法进行比较。镇痛疗效优于其他物理疗法。因此TENS镇痛疗法是一种较理想、新颖的物理疗法。     

DMA-80仪对尿样中汞测定研究

汞作为一种常用工业金属材料具有广泛的使用范围，但汞具有不同于一般金属材料的特性，如蒸汽压比较低，在常温条件下即能蒸发，同时汞蒸汽吸人又是造成汞中毒最常见的中毒途径。人吸人汞蒸汽浓度在1～3mg/m^3数小时后就会发生急性中毒，发生化学性肺炎；在0．1mg／m^3以上时，会出现食欲减退、失眠，甚至震颤的中毒症状。汞进人体内后主要通过肾脏由尿液排泄。因此，对尿液中的汞含量进行检测，是评价职业性汞暴露重要的生物学评价方法，如职业病诊断标准规定尿液中汞安全限值为0．010mg／L。