HBV感染者HBV-DNA阳性血清HBeAg阴性的影响因素

目的 探讨HBV感染者HBV—DNA阳性血清HBeAg阴性的影响因素。方法 采用ms—PCR及ELISA方法分别检测HBV感染者血清中A-1896及HBeAg／IC。结果 29例HBV—DNA阳性、HBeAg阴性血清标本，HBeAg／IC阳性17例(58．7％)，单一A-1896者3例(10．3％)，HBeAg／IC及A-1896共存2饲(6．9％)。结论 HBeAg／IC形成是HBV—DNA阳性血清HBeAg阴性的主要原因，而非A-1896。     

香菇多糖对巨噬细胞一氧化氮和一氧化氮合酶活性的影响

目的研究香菇多糖(LTN)诱导巨噬细胞的一氧化氮(NO)生成和一氧化氮合酶(iNOS)的活性,探讨LTN的免疫调节作用机理.方法采用Griess反应和荧光法测定不同剂量的LTN作用小鼠腹腔巨噬细胞后NO的生成量和iNOS活性.观察mRNA转录抑制剂、蛋白质合成抑制剂和iNOS抑制剂对巨噬细胞NO的生成和iNOS活性的影响.结果LTN能使小鼠腹腔巨噬细胞NO生成增加,iNOS活性增高,并呈作用剂量依赖关系.3种抑制剂均能抑制LTN诱导的小鼠腹腔巨噬细胞N0的生成和iNOS活性.结论LTN能刺激小鼠腹腔巨噬细胞提高iNOS活性和NO的生成.提示LTN的免疫调节作用机制可能与LTN刺激巨噬细胞NO生成有关.     

梓白皮化学成分研究

目的 研宄梓白皮Catalpa Ovata G．Don的化学成分。方法 采用硅胶柱、Sephadex LH-20柱色谱分离纯化，通过理化常数和光谱分析鉴定化合物的结构。结果 从梓白皮分离得到7个化合物。根据波谱分析和理化数据，鉴定出其中的5个化合物分别为：梓苷(catalposide，I)、香草酸(vanillic acid，Ⅱ)、β-胡萝卜苷(β-daucosterol,Ⅲ)、十六碳酸(palmitic acid，Ⅳ)、β-谷甾醇(β-sitosterol,V)。结论 化合物I为首次从梓白皮中分离得到。     

大黄蒽醌含量测定方法的研究

目的：测定大黄中游离蒽醌和总蒽醚的含量。方法：采用甲醇冷浸法，利用蒽醌衍生物在碱性条件下呈红色的特点，用可见分光光度法测定其含量。结果：该法测定平均回收率为100．2％，RSD＝2．96％(n＝5)，线性范围为5μg一30μg，r＝0．9999。结论：用本法检测大黄中的蒽醌含量，方法简便，结果可靠。     

3-氯-2,4,5-三氟苯甲酸的合成

目的：合成3-氯-2，4，5-三氟苯甲酸。方法：以3，4，5，6--四氟苯二甲酸为起始原料，经酯化、氨化、重氮化和桑德德迈耳反应制得3--氯苯甲酸。结果：酯化时使用发烟硫酸；重氮化和桑德德迈耳反应时溶剂由水改为水和二氯乙烷，使产率增加，质量提高。结论：该合成路线条件温和，操作简单，收率提高到61．8％。     

Protein covalent binding of maxipost through a cytochrome P450-mediated ortho-quinone methide intermediate in rats.

(3S)-(+)-(5-Chloro-2-methoxyphenyl)-1,3-dihydro-3-fluoro-6-(trifluoromethyl)-2H-indole-2-one) (MaxiPost, BMS-204352) is a potent and specific opener for maxi-K channels and has potential to prevent and treat ischemic stroke. Following single intravenous doses of [14C]BMS-204352 to rats, only 10 to 12% of radioactivity was extractable from plasma with organic solvents. The unextractable radioactivity remained associated with the proteins (mostly albumin) after SDS-polyacrylamide gel electrophoresis or dialysis. Following acid hydrolysis in 6 M HCl for 24 h at 110 degrees C from plasma proteins collected from nine rats dosed with [14C]BMS-204352, one major radioactive product was isolated and identified as a lysine-adduct of des-fluoro des-O-methyl BMS-204352 by liquid chromatography/mass spectrometry and NMR analyses as well as by comparison with the synthetic analog, lysine-adduct of des-fluoro BMS-204352 (BMS-349821). The covalent binding of BMS-204352 results from the displacement of the ring-fluorine atom of des-O-methyl BMS-204352 with the epsilon-amino group of a lysine residue. Microsomal incubations of [14C]BMS-204352 resulted in low levels of covalent binding of radioactivity to proteins. This in vitro covalent binding required cytochrome P450-reductase cofactor NADPH and was attenuated by glutathione. P4503A inhibitors ketoconazole and troleadomycin selectively prevented the covalent binding in vitro. Based on these observations, a two-step bioactivation process for the protein covalent binding of BMS-204352 was postulated: 1) P4503A-mediated O-demethylation leading to spontaneous release of HF and the formation of an ortho-quinone methide reactive metabolite and 2) nucleophilic addition of the epsilon-amino group of protein lysine residue(s) in protein to form des-fluoro des-O-methyl BMS-204352 lysine adduct.     

某部队医院1999～2001年心血管药物应用分析

目的：了解某部队医院心血管类药物应用现状和发展趋势。方法：以限定日剂量法和消耗金额排序法对1999-2001年该院心血管类药物水泵品种和金额进行归类统计，分析该类药物用药情况。结果：该类药物费用上升较快；钙拮抗药，防治心绞痛药物和降压药等应用最多；临床应用以国产和合资生产品种为主。结论：该类药物费用增加很快，应注意合理用药。     

原发性卵巢平滑肌肉瘤临床分析(附3例报告及国内20例综合分析)

目的 探讨原发性卵巢平滑肌肉瘤的临床特点、诊断、治疗方法，以及可能预后相关因素。方法 对3例原发性卵巢平滑肌肉瘤综合国内近10年报道20例进行分析。结果 原发性卵巢平滑肌肉瘤可发生于任何年龄，主要为绝经后妇女。临床表现不典型，诊断主要依靠病理，同时结合免疫组化Desmin( )，Vimentin( )诊断。结论 原发性卵巢平滑肌肉瘤恶性度高，预后差，并且可能与分化程度及其微血管相关。治疗以手术为主，辅以合适的放疗和化疗综合治疗。     

瘤内注射重组人p53腺病毒治疗晚期肺癌临床试验观察

目的 观察重组人p53腺病毒注射液(rAd-p53)在晚期肺癌治疗中的疗效和毒副反应。方法 12例IIIb-IV期肺癌及3例肺转移癌,CT定位经皮肺穿刺瘤内注射rAd-p53,1 次/周×4/疗程;通过临床观察、CT及病理对照及短期随访进行评价。结果 治疗后2 月观察肿瘤缩小5例(33.3%),无变化7例(46.7%),增大3例(20%);治疗后病理观察:癌组织坏死,癌细胞稀少(6/11,54.5%);除自限性发热外,无明显毒副反应。结论rAd-p53瘤内注射治疗肺癌,无明显毒副作用,能较好地抑制局部肿瘤的发展,尤其对失去手术机会,不能耐受放化疗的患者,是一种可行的有前景的方法。     

Comparison between isotropic and nonisotropic dosimetry systems during intraperitoneal photodynamic therapy

BACKGROUND AND OBJECTIVE: On-line monitoring of light fluence during intraperitoneal photodynamic therapy (IP PDT) is crucial for safe light delivery. A flat photodiode-based dosimetry system is compared with an isotropic detector-based system in patients undergoing IP PDT. STUDY DESIGN/MATERIALS AND METHODS: Flat photodiodes and spherical detectors were placed side by side in the abdomen, for simultaneous light dosimetry in 19 patients. Tissue phantom experiments were performed to provide a preliminary estimate of the tissue optical properties of the peritoneum. RESULTS: The conversion factor between systems for 630-nm light was found to be 1.7 +/- 0.12. The mu(eff) of the tissues in the abdomen is estimated to vary between 0.5 cm(-1) to 1.4 cm(-1) assuming a mu(s)' = 7 cm(-1). CONCLUSIONS: The measured conversion factor should allow for comparison of light fluences with future clinical protocols that use an isotropic-based detector system. Differences in the optical properties of the underlying tissues may contribute to the variability in light measurements.