固体支撑双层类脂膜电化学传感器的研究和应用

由于双层类脂膜(bilayer lipid membranes.BLM)是生物膜极好的实验模型,因此在电化学传感器的研究领域显示出广泛的应用前景。评述了双层类脂膜(BLM)、固体支撑的双层类脂膜(s-BLM)的制备方法和特性,介绍了双层类脂膜在电化学生物传感器中的应用,并展望了发展前景。     

Bimodal skew-symmetric normal distribution

ABSTRACT

We introduce a new parsimonious bimodal distribution, referred to as the bimodal skew-symmetric Normal (BSSN) distribution, which is potentially effective in capturing bimodality, excess kurtosis, and skewness. Explicit expressions for the moment-generating function, mean, variance, skewness, and excess kurtosis were derived. The shape properties of the proposed distribution were investigated in regard to skewness, kurtosis, and bimodality. Maximum likelihood estimation was considered and an expression for the observed information matrix was provided. Illustrative examples using medical and financial data as well as simulated data from a mixture of normal distributions were worked.     

The Patient Profile Pharmacy Filing System

Abstract

“Herpes Simplex Virus Proctitis in Homosexual Men: Clinical, Sigmoidoscopic, and Histopathological Features,” Steven E. Goodell, Thomas C. Quinn, Emmanuel Mkrtichian, Michael D. Schuffler, King K. Holmes, and Lawrence Corey. Acute herpes simplex virus (HSV) infection was detected in 23 of 102 consecutively examined, sexually active male homosexuals who presented with anorectal pain, discharge, tenesmus, or hematochezia, as compared with 3 of 75 homosexual men without gastrointestinal symptoms (P < 0.01). Findings that were significantly more frequent in men with HSV proctitis than in men with proctitis due to other infectious causes included fever (48 per cent), difficulty urinating (48 per cent), sacral paresthesias (26 per cent), inguinal lymphadenopathy (57 per cent), severe anorectal pain (100 per cent), tenesmus (100 per cent), constipation (78 per cent), perianal ulcerations (70 per cent), and the presence of diffuse ulcerative or discrete vesicular or pustular lesions in the distal 5 cm of the rectum (50 per cent). Serologic evidence indicated that 85 per cent of the men with symptomatic HSV proctitis were having their first episode of HSV-2 infection. The diagnosis of HSV proctitis is suggested by the presence of severe anorectal pain, and diffuse ulceration of the distal rectal mucosa. (New England Journal of Medicine 1983;308:868–71.)     

104例急性脑卒中后抑郁状态患者血清中血脂的变化研究

目的 探讨急性脑卒中后抑郁状态患者血脂水平及临床意义.方法 对104例卒中后抑郁状态(PSD)患者、49例卒中后无抑郁状态患者及28例正常人进行血脂检测,并做对照分析.结果 PSD患者血清胆固醇(TC)水平高于对照组和非抑郁组,而血清中甘油三酯(TG)、高密度脂蛋白(HDL-C)、低密度脂蛋白(LDL-C))较非抑郁组和对照组无明显差异,并且各血脂浓度与汉密尔顿抑郁量表(HAMD)的得分及自评抑郁量表(SDS)的得分无相关性.结论 脑卒中后抑郁可引起血清胆固醇水平升高,但与抑郁障碍的严重程度无相关性.     

从异文看卞藏本《红楼梦》早于甲戌本

将卞藏本《红楼梦》与甲戌本、己卯本、庚辰本及其他重要本子作比对,发现数量很大的重要异文。卞藏本数量很大的重要异文在《红楼梦》已知重要本子中独一无二。文章列出的卞藏本一至十回有64处重要异文,甲戌本、己卯本、庚辰本之外的其他重要本子只有极个别几处基本相同。从卞藏本与甲戌本、己卯本、庚辰本大量重要文字差异的基本特征,可以得出结论:卞藏本底本早于甲戌本,卞藏本的底本属于早期脂本。     

游泳训练对小鼠抗氧化能力的影响

通过测定经训练和未经训练小鼠一次力竭游泳后血浆、心脏、脑和骨骼肌中丙二醛 (MDA)含量和谷胱甘肽过氧化物酶 (GSH -px)活性 ,比较两组小鼠血浆、心、脑和骨骼肌中自由基损伤程度 ,探讨体育锻炼对机体抗自由基损伤的保护作用 .结果 :同样一次力竭性游泳 ,经训练组小鼠血浆、心脏、脑和骨骼肌中MDA含量显著低于未训练组 (P <0 .0 5 ) ,而GSH -px活性却显著增高 (P <0 .0 5 ) .提示经常性的体育锻炼可提高机体抗氧化能力 ,减轻OFR引发的脂质过氧化损伤     

种子吸胀冷害与膜脂过氧化作用

以大豆和豌豆种子为材料，研究了低温吸胀（5℃）对种子细胞内几种保护酶活性以及两种有害物质含量消长的影响。结果表明，抗冷性较强的豌豆种子于5℃吸胀后转入25℃萌发期间，SOD、POD和CAT3种酶活性恢复提高较快；MDA和H2O2积累量少；冷敏感的大豆种子上述3种酶活性提高缓慢，MDA和H2O2均有一定积累。种子吸胀冷害与膜脂过氧化酶促防御系统功能减弱有关。     

衰竭性游泳运动对大白鼠红细胞膜的影响

研究了衰竭性游泳运动对大白鼠红细胞膜和血浆中脂质过氧化反应的影响,并测定了红细胞膜上酶活性的变化.结果表明,衰竭性游泳运动能引起红细胞膜和血浆中脂质过氧化反应的终产物丙二醛(MDA)含量增加,膜上的Na~+,K~+-ATPase和Ca~--ATPase活性明显下降;红细胞溶血试验表明.运动引起红细胞溶血率上升.     

辛伐他汀对血脂正常的急性冠脉综合征患者炎症因子及预后的影响

目的观察血脂正常的急性冠脉综合征（ACS）早期应用辛伐他汀对C反应蛋白（CRP）及心血管事件发生的影响。方法将64例血脂正常的急性冠脉综合征患者随机分为治疗组（n=32除常规治疗外加服辛伐他汀20mg）和对照组（n=32仅常规治疗）,于治疗前、治疗4w后观察C反应蛋白变化,心血管事件发生次数。结果治疗组于治疗后CRP有明显下降（1.76mg/L对2.11mg/L,P〈0.05）,并明显低于对照组（1.76mg/L对2.08mg/L,P〈0.05）,心血管事件也明显少于对照组（9.4%对31.3%,P〈0.05）。结论辛伐他汀对血脂正常的ACS早期治疗能明显降低CRP水平,抑制炎症反应,稳定易损斑块,减少心血管事件的发生。     

Gender-dependent variations in systemic biomarkers of oxidative protein,DNA, and lipid damage in aged rats

Introduction.?The effect of aging on plasma-protein, lipid and DNA oxidation is well documented. However, none of the studies specify the effect of gender. The purpose of this study is to clarify the ambiguity raised in preliminary reports as to gender dependency of oxidative damage in plasma.

Methods.?In the current study, we investigated the relation between 8-hydroxy-2′-deoxyguanosine levels (8-OHdG), which is a measure of DNA oxidation and protein oxidation parameters such as protein carbonyl (PCO), total thiol (T-SH), and advanced oxidation protein products (AOPP). Our study also covered other oxidative stress parameters, such as lipid hydroperoxides (LHP), malondialdehyde (MDA), erythrocyte glutathione (GSH), superoxide dismutase (Cu-Zn SOD) and the catalase (CAT) activity in plasma of the male and female aged rats.

Results.?8-OHdG and MDA levels in male rats were significantly higher than those in the female group (p?<?0.01 for both parameters). T-SH levels were found to be higher in female rats than in the male (p?<?0.05). Plasma Cu-Zn SOD activities of male rats were significantly higher compared with those of the female rats (p?<?0.05). On the other hand, PCO, AOPP, LHP, GSH levels, and CAT activity were not found to be different between genders.

Conclusions.?We suggest that increased T-SH levels found in female rats may point to an adaptive reaction to oxidative damage, reflecting 8-OHdG and MDA overproduction. We are of the conviction that the increased 8-OHdG and MDA that we have determined in aged male rats may be a risk factor in the extent of oxidation in plasma.