镉诱导LLC-PK_1细胞凋亡与bcl-2、p53蛋白表达关系的研究

目的　探讨镉诱导LLC PK1 细胞凋亡及与bcl 2、p5 3(mtp5 3)蛋白表达的相互关系。方法　采用透射电镜观察凋亡小体、流式细胞仪分析凋亡率、琼脂糖凝胶DNA电泳方法确定镉对LLC PK1 细胞诱导的凋亡作用 ,以及流式细胞仪分别测定bcl 2和p5 3基因表达产物bcl 2蛋白、mtp5 3蛋白。结果　透射电镜观察发现 4 0 μmol LCdCl2 作用LLC PK1 细胞 12h后 ,出现典型的凋亡小体 ;流式细胞仪分析其凋亡率为 32 6 1% ,并高于对照组 (1 0 8% ) (P <0 0 1) ;琼脂糖凝胶DNA电泳呈明显梯形条带。 0、10、2 0、4 0 μmol LCdCl2 作用LLC PK1 细胞 4h、8h ,8h后 ,bcl 2基因表达逐渐下降 ,并呈良好的剂量 -反应关系 (r=- 0 910 ,P <0 0 5 ) ;作用 4h、8h后mtp5 3蛋白表达均明显下降 ,并有剂量 -反应关系 (r值分别为 - 0 716、- 0 972 ,P值均 <0 0 5 )。结论　镉诱导LLC PK1 细胞凋亡可能与镉抑制bcl 2、mtp5 3蛋白表达有关     

氯沙坦和非洛地平治疗中老年高血压合并高尿酸血症的疗效观察

[目的 ]　比较氯沙坦和非洛地平对中老年高血压合并高尿酸血症的疗效。　 [方法 ]　 60例中老年高血压合并高尿酸血症患者随机分成两组 ,分别服用氯沙坦 (氯沙坦组 ,n =3 0例 )和非洛地平 (非洛地平组 ,n =3 0例 ) ,分别测定两组患者治疗前后的血压、2 4h动态血压、血尿酸、空服血糖、血脂和肝肾功能。　 [结果 ]　氯沙坦和非洛地平均有明显的降压效果 (P <0 .0 1) ,两组的降压效果相似 (P <0 .0 5 ) ,但氯沙坦降低血尿酸的效果优于非洛地平 (P <0 .0 0 1) ,对血糖、肝肾功能、血脂均无明显作用 ,未发生明显不良反应。　 [结论 ]　氯沙坦治疗中老年高血压安全、有效 ,与非洛地平相似 ,并且有降低高血尿酸作用     

桔青霉素简介及其免疫学检测方法研究进展

桔青霉素是能引起肾脏毒性的真菌毒素 ,并有致癌性。本文综述了桔青霉素的物理、化学和生物学特性及其免疫学检测方法研究进展。     

Interaction and Relationship Between Angiotensin Converting Enzyme Gene and Environmental Factors Predisposing to Essential Hypertension in Mongolian Population of China

Objective To investigate the association of specific functional gene ACE (I/D) variants of the renin-angiotensin system with essential hypertension (EH) and interaction between ACE (I/D) gene and risk factors for EH in a genetically homogenous Mongolia rural population of China. Methods Individuals (n=1099) were recruited from general population of Kezuohouqi Banner in Inner Mongolian Autonomous Region. Results The association was found between ACE genotype DD plus ID and EH, with an interaction between ACE genotype DD plus ID and cigarette smoking in an additive model. Cigarette smoking index and ACE gene showed a low exposure-gene (LEG) effect on EH, with interaction indices from 7.10 to 1.16. Interaction between ACE genotype DD plus ID and alcohol drinking on EH appeared an additive model. Alcohol drinking index and ACE gene showed a low exposure-gene (LEG) effect on EH, with interaction indices from 1.66 to 1.09. BMI and ACE gene showed a low exposure-gene (LEG) effect on EH, with interaction indices from 6.15 to 2.49.Interactions between ACE genotype and WHR on EH showed a multiplicative model. In a short, there was an interaction between ACE gene and cigarette smoking, alcohol drinking and BMI on EH,especially in a low dose-exposure effect.Cpmchusion It is important for individuals who carry ACE D allele gene to prevent FH, and furthermore, to prevent and control coronary heart disease, in a view of population-based prevention.     

Comparison Study on Clinical and Neuropathological Characteristics of Hamsters Inoculated With Scraple Strain 263K in Different Challenging Pathways

OBJECTIVE: To understand the infectious characteristics of a hamster-adapted scrapie strain 263K with five different routes of infection including intracerebral (i.c.), intraperitoneal (i.p.), intragastrical (i.g.), intracardiac and intramuscular (i.m.) approaches. METHODS: Hamsters were infected with crude- or fine-prepared brain extracts. The neuropathological changes, PrP(Sc) deposits, and patterns of PK-resistant PrP were analyzed by HE stain, immnunohistochemistry (IHC) assay and Western blot. Reactive gliosis and neuron loss were evaluated by glial fibrillary acidic protein (GFAP) and neuron specific enolase (NSE) specific IHC. RESULTS: The animals inoculated in i.m. and i.p. ways with crude PrP(Sc) extracts showed clinical signs at the average incubation of 69.2 +/- 2.8 and 65.5 +/- 3.9 days. Inoculation in i.c. and intracardiac ways with fine PrP(Sc) extracts (0.00035 g) caused similar, but relative long incubation of around 90 days. Only one out of eight hamsters challenged in i.g. way with low dosage (0.01 g) became ill after a much longer incubation (185 d), while all animals (4/4) with high dosage (0.04 g) developed clinical signs 105 days postinfection. The most remarkable spongiform degeneration and PrP(Sc) deposits were found in brain stem among the five challenge groups generally. The number of GFAP-positive astrocytes increased distinctly in brain stems in all infection groups, while the number of NSE-positive cells decreased significantly in cerebrum, except i.c. group. The patterns of PK-resistant PrP in brains were basically identical among the five infection routes. CONCLUSION: Typical TSE could be induced in hamsters by inoculating strain 263K in the five infection ways. The incubation periods in bioassays depend on infective dosage, administrating pathway and preparation of PrP(Sc). The neuropathological changes and PrP(Sc) deposits seem to be related with regions and inoculating pathways.     

老年人自评状况和社会支持与老年抑郁症患病率

目的 探讨老年人抑郁症患病率与自评状况及社会支持的关系。方法 就调查的1736名老年人的自评状况以及社会支持分别进行单因素的患病率分析，再进行多因素Logistic回归分析。结果 自评健康状况差、患有老年慢性支气管炎和癌症、健康恶化都可以增加老年抑郁症的患病率。     

老年人躯体疾病与老年抑郁症患病率

目的 探讨老年人躯体疾病与抑郁症患病率的关系。方法 就调查的1736名老年人的自评健康情况、躯体患病情况以及健康恶化情况分别进行单因素的患病率分析，再进行多因素Logistic回归分析。结果 自评健康差、患有老年慢性支气管炎和癌症、健康恶化都可以提高老年抑郁症的患病率。     

从视频图像的灰度重建CT数算法的研究

介绍一种在CT机数据格式未知情况下由视频图像的灰度重建CT数的算法.主要应用于PACS中的CT图像的数字化.该法通过对若干幅视频采集的CT图像的处理,由灰度反求CT数.随后,在所有的CT图像的存贮和传输的过程中用CT数代替灰度图像,需要图像时,再将CT数按新的窗宽、窗位转化为灰度图像.这种方法应用于没有数字接口的CT机上,可以在计算机上模拟CT机上根据窗宽、窗位的变化得到不同图像的效果,具有良好的实验效果与实用价值.     

Firebird冠脉涂膜支架系统生物学安全性评价研究

依据国家标准GB/T16175-1996,选择10项试验对Firebird冠脉涂膜支架系统进行生物学安全性评价[1],结果表明该支架系统的血液相容性良好,无全身毒性和细胞毒性,无热源性、致敏性、刺激性,也无遗传毒性,组织相容性尚可,是一种生物相容性优良的Firebird冠脉涂膜支架系统.     

慢性化脓性中耳炎的咽鼓管功能对手术疗效的影响

目的探讨慢性化脓性中耳炎咽鼓管功能改变对手术疗效的影响.方法分析40耳行鼓室成形术的慢性化脓性中耳炎的咽鼓管功能与手术疗效的关系.咽鼓管功能检查用正-负压试验、TTAG法及音响法,咽鼓管鼓室口及咽口的观察分别用鼓室镜及鼻窦镜,对比分析咽鼓管功能改变与病变部位的关系,并比较鼓室成形术后咽鼓管功能正常耳与异常耳的鼓膜生长及听力变化情况.结果慢性化脓性中耳炎的咽鼓管功能与鼓室口病变程度相关,鼓室口病变轻者,咽鼓管功能良好;而鼓室口病变重者咽鼓管功能不良.40耳鼓室成形术后咽鼓管功能良好耳鼓膜生长良好,咽鼓管功能不良耳鼓膜生长欠佳;两者均有统计学意义.结论慢性化脓性中耳炎咽鼓管功能与鼓室成形术效果关系密切,咽鼓管功能障碍可能是导致手术失败的重要因素之一.