大鼠摄入铝,氟及其不同比例混合物后血和骨中铝氟含量分析

Wistar rats were divided into 8 groups:control, 300 ppm F, 130 ppm F, 300 ppm Al, 1200 ppm Al, 130 ppm Al + 130 ppm F. 300 ppm Al + 300 ppm F and 1200 ppm Al + 300 ppm F. The chemicals were mixed into the standard diet. The animals were fed on the diets for 12 weeks. Contents of F, Al, Ca and P in the blood (or serum) and humerus were determined at the end of 12 weeks. The results showed that the level of F in the blood and bone in the unadulterated F group was increased, especially F in the bone reached a level more than 10 times that of the control. In the 3 mixture groups, blood F and bone F were lowered, while blood F was restored to normal level, but bone F was not nevertheless, the results showed that Al was in antagonism to the absorption of F. In the unadulterated Al groups, blood and bone Al did not parallel with the amount of Al administered. The level of Al in the median Al group was higher than that of the high Al group. Taking the level of blood and bone Al as a measure, when different doses of Al were administered with F, in the low and median dosage of Al, F was in antagonism to Al absorption, but in case of high dosage of Al, F was in potentiation to Al absorption. In all the experimental groups serum P was elevated, but serum Ca was not disturbed. Bone Ca and P were decreased only in the 3 groups with unadulterated F as well as unadulterated and adulterated high dosage of Al. Mechanism of the nonlinearity of Al absorption vs Al dosage, as well as the dual effect of F on the absorption of Al was proposed.     

粘病毒抵抗基因-1启动子88位点G/T多态性影响乙型肝炎病毒感染的自然转归

目的探讨乙型肝炎病毒（HBV）自限感染和慢性感染与粘病毒抵抗基因-1（MxA）启动子的-88位点G／T单核苷酸多态性的关系。方法收集100例抗-HBs和抗-HBc阳性的HBV自限感染者和340例慢性感染者的外周全血，提出基因组DNA；采用竞争分化聚合酶链反应技术为基础的方法进行MxA-88G／T基因分型；采用单因素Odds ratio和x^2检验等方法进行统计学分析。结果MxA-88G／G基因型（低表达型）检出率为50．2％（221／440），T／T基因型（高表达型）检出率为5．5％（24／440），G／T杂合型检出率为44．3％（195／440）。与慢性感染患者相比，自限感染患者携带较低的G／G基因型（41．0％与52．9%，P〈0．05）、G等位基因（62．5％与75．3％，P〈0．01）和较高的T／T基因型（16．0％与2．4%，P〈0．01）、T等位基因（37．5％与24．7％，P〈0．01），而两者之间的G／T杂合型差异无统计学意义。结论MxA-88G／T基因型能在一定程度上影响HBV感染的自然转归，有望成为临床上HBV感染转归的预测指标。     

红霉素糊剂治疗根尖周病216例的疗效观察

空管药物疗法是治疗死髓牙的一种方法，属根管治疗范畴。临床上可采用多种药物处理。我们采用红霉素糊剂治疗根尖周病216例，取得满意效果。     

最新消息

“首届青年中医读书知识竞赛”的答卷评审工作目前正在南京紧张进行,对最后评出的一、二、三等获奖者,竞赛主办部门还将按照参赛条例进行资格审查。本刊将于下期公布标准答案及获奖名     

羊水干细胞研究进展与肝细胞移植治疗

干细胞(stem cell)是具有自我更新和向多种细胞分化能力的细胞,是目前医学、生物学及组织工程学研究的热点之一.     

烧香与癌症

研究人员指出：烧香可以产生一种香味，但是不断地吸人这种香烟会对人们产生危害，使他们罹患呼吸道癌症。     

重睑术

重睑术是美国最流行的美容外科手术，每年的手术人数达500000-600000之多。洛杉矶Jules Stein眼科研究所的Baylis医师说，1年做10例的医师可以与1年做200例其他医师一样熟练。Baylis医师估计，人群的25％企望做重险术。     

以科学发展观为指导全面提升护理质量管理

科学发展观的第一要义是发展，核心是以人为本。护理学科能否发展，质量管理是核心，人才培养是关键。如何提高护理质量管理、加强在职护士培训是护理管理者面临的一项长期而艰巨的任务。