小鼠内毒素休克某些血液变化和细胞超微结构损伤的发生

小鼠内毒素休克有血液的乳酸、ＮＰＮ、ＡＫＰ、ＬＤＨ水平升高和ｐＨ值降低并可用６５４－２或ＡＬ所预防，只是预防ＮＰＮ升高的效应须在早期的肾血管挛缩消失后才能显示出来；心、肝、肠和肺的ＭＤＡ含量升高并可被６５４－２预防，除肺外还可被ＡＬ预防；将高肺ＭＤＡ只能用６５４－２预防结合注射内毒素后１０ｍｉｎ有ＷＢＣ入肺扣押来看，损伤肺的自由萁坷能主要来自被激活的中性粒细胞；血中ＡＫＰ和ＬＤＨ升高分别反映溶酶体     

银杏叶提取物在MPTP神经毒中的抗氧化作用

目的 观察银杏叶提取物（Ginkgo biloba leaves EGb)在1－甲基－4－苯基－1,2,3,6－四氢吡啶（1－methyl-4-phenyl-1,2,3,6-tetrahyropyridine,MPTP)神经毒中的抗氧化作用。方法 采用大脑立体定位仪向黑质内注射MPTP,腹腔注射EGb连续20d,测定大鼠相关脑区中丙二醛（malondiadehyde,MDA)、超氧化物歧化酶（superoxide dismutase,SOD)含量的变化。结果 MPTP使黑质中的MDA增高,SOD降低;EGb对此有明显的抑制作用。结论 EGb在MPTP神经毒中有明显的抗氧化作用。     

小鼠胚胎干细胞体外分化为神经前体细胞的研究

目的 探索小鼠胚胎干细胞（Embryonic stem cell,ES cell）体外分化为神经前体细胞（Neural precursor cells,NPC）的无血清培养条件,比较人胚胎成纤维细胞（Human embryonic fibroblasts,HEF）与小鼠胚胎成纤维细胞（Mouse embryonic fibroblasts,MEF）对小鼠ES细胞生长的作用。方法 在MEF或HEF饲养层上培养ES细胞,培养液中含白血病抑制因子。采用无血清方法培养NPC,免疫组化方法检测巢蛋白（Nestin）,用硝基四氮啖蓝/5-溴-4-氯-吲哚基磷酸（NBT/BCIP）显色检测碱性磷酸酶。结果 无血清培养可以获得86%的NPC。HEF与MEF-样能维持ES未分化状态。结论 无血清培养方法有利于ES细胞向NPC分化,HEF可用于小鼠ES细胞的培养,而且比MEF优越。     

围产期缺氧对新生儿脐血氧自由基的影响及意义

目的:探讨围产期缺氧而Apgar评分≥8分的新生儿脐血中氧自由基的变化情况。方法:以同期正常新生儿作对照,搜集围产期缺氧而生后Apgar评分≥8分的新生儿脐血,测定脐血中的超氧化物歧化酶(SOD)、过氧化物酶(GPX)及丙二醛(MDA)的含量。结果:围产期缺氧能引起新生儿脐血中SOD及MDA显著意义的改变;GPX有一定程度的降低,与对照组比较无差异。结论:围产期缺氧能够造成氧自由基的生成增多和抗氧化酶的消耗,即使生后Apgar评分≥8分的新生儿,亦应加强监护,及时补充外源性抗氧化剂以预防缺氧后的多器官系统损伤。     

Ultraviolet blood irradiation and oxygenation affects free radicals and antioxidase after rabbit spinal cord injury

Ｕｌｔｒａｖｉｏｌｅｔｂｌｏｏｄｉｒｒａｄｉａｔｉｏｎａｎｄｏｘｙｇｅｎａｔｉｏｎ (ＵＢＩＯ)ｉｓａｆｏｒｍｏｆｐｈｙｓｉｃａｌｔｈｅｒａｐｙ ,ｄｕｒｉｎｇｗｈｉｃｈａｃｅｒｔａｉｎｖｏｌｕｍｅｏｆｖｅｎｏｕｓｂｌｏｏｄｉｓｄｒａｗｎｆｒｏｍａｐａｔｉｅｎｔａｎｄｐｒｏｃｅｓｓｅｄｗｉｔｈａｓｐｅｃｉｆｉｃｄｏｓｅｏｆｕｌｔｒａｖｉｏｌｅｔｉｒｒａｄｉａｔｉｏｎａｎｄｏｘｙｇｅｎａｔｉｏｎｉｎａｂｌｏｏｄｔｈｅｒａｐｙｉｎｓｔｒｕｍｅｎｔ,ｉｔｉｓｔｈｅｎｉｎｆｕｓｅｄｂａｃｋｉｎｔｏｔｈｅｓａｍ…     

应用髂嵴游离骨组织修复下颌骨缺损

目的:总结应用髂嵴游离骨组织修复下颌骨缺损的经验.方法:回顾21例应用游离髂嵴骨组织即时修复下颌骨缺损,对手术方法、术中、术后处理等进行总结分析.结果:用髂嵴游离骨组织修复下颌骨术后并发症少,手术成功率高(87.5%),能进行即刻种植体植入.结论:对不能开展显微外科的医院,下颌骨缺损患者用游离髂嵴骨组织修复仍可作为首选方法.     

胆必清对内毒素诱导的大鼠腹腔巨噬细胞内游离钙浓度的影响

目的：探讨中药胆必清对内毒素诱导的大鼠腹腔巨噬细胞游离钙浓度的影响。方法：制备大鼠腹腔巨噬细胞并在体外进行孵育,使用荧光探针用荧光法测定钙浓度。巨噬细胞随机分为正常对照组,内毒素LPS组,小、中和大剂量中药组。结果：LPS能诱导巨噬细胞[Ca2^ ]i的升高。加入胆必清后,[Ca2^ ]i可有不同程度的降低。结论：胆必清能抑制LPS诱导的大鼠腹腔巨噬细胞内的[Ca2^ ]i升高,提示该药具有抗炎和免疫调节作用。     

电化法研究壳聚糖树脂与游离酸的相互作用

利用电化学实验技术跟踪交联壳聚糖树脂吸附低浓度游离酸的行为,讨论了不同盐酸浓度和不同甲醇浓度两种因素对吸附的影响,并利用固液相互作用方程,求取吸附剂－吸附质相互作用能。实验结果表明,交联壳聚糖树脂吸附低浓度游离酸的过程是遵循单分子 机制进行的。     

NO在外源性自由基损伤内皮细胞中的作用

目的：探讨ＮＯ在外源性自由基损伤内皮细胞（ＥＣ）中的作用。方法：培养的家兔主动脉ＥＣ随机分为四组：１．对照组（Ｃ,ｎ＝６）：２ｍｌＰＢＳ;２．自由基损伤组（Ｘ／ＸＯ,ｎ＝６）：２ｍｌＰＢＳ中加入终浓度为１μｍｏｌ／ｍｌＸ,０．１ＩＵ／ｍｌ的ＸＯ;３．Ｌ－Ａｒｇ组：含终浓度为１０＾－３Ｍ的Ｌ－Ａｒｇ,余同２;４．ＳＮＰ组：含终浓度为１０＾－５Ｍ的ＳＮＰ,余同２。在观察Ｌ－ＮＡＭＥ对自由基损伤的作用时     

A study of the neurotoxic effect of MDMA (‘ecstasy') on 5-HT neurones in the brains of mothers and neonates following administration of the drug during pregnancy

1. It is well established that 3,4-methylenedioxymethamphetamine (MDMA or ‘ecstasy'') is neurotoxic and produces long term degeneration of cerebral 5-hydroxytryptamine (5-HT) nerve terminals in many species. Since MDMA is used extensively as a recreational drug by young people, it is being ingested by many women of child bearing age. We have therefore examined the effect of administering high doses of MDMA to rats during pregnancy on the cerebral content of both the dams and the neonates.
2. MDMA (20 mg kg⁻¹, s.c.) was injected twice daily on days 14–17 of the gestation period. The initial dose produced a marked hyperthermic response in the dam which was progressively attenuated in both peak height and area under the curve following further doses of the drug. The body weight of the dams decreased during the period of treatment.
3. There was a modest decrease in litter size (−20%) of the MDMA-treated dams.
4. The concentration of 5-HT and its metabolite 5-HIAA was decreased by over 65% in the hippocampus and striatum and 40% in the cortex of the dams 1 week after parturition. In contrast, the content of 5-HT and 5-HIAA in the dorsal telencephalon of the pups of the MDMA-treated dams was the same as that seen in tissue from pups born to control animals.
5. Administration of MDMA (40 mg kg⁻¹, s.c.) to adult rats increased thiobarbituric acid reacting substances (TBARS) in cortical tissue 3 h and 6 h later, indicating increased lipid peroxidation. No increase in TBARS was seen in the cortical tissue of 7–10 day neonates injected with this dose of MDMA 3 h or 6 h earlier.
6. The data suggest that exposure to MDMA in utero during the maturation phase does not produce damage to 5-HT nerve terminals in the foetal rat brain, in contrast to the damage seen in the brains of the mothers. This may be due to MDMA being metabolized to free radical producing entities in the adult brain but not in the immature brain or, alternatively, to more effective or more active free radical scavenging mechanisms being present in the immature brain.