环孢素A体外抗曼氏血吸虫作用的观察

ＭＦ１小鼠实验感染曼氏血吸虫尾蚴１周、３周和６周后，分别经肺静脉和门静脉灌注取虫。实验显示，药物体外抗曼氏血吸虫的作用呈时间、剂量和虫龄依赖方式，童虫和雄虫对药物更敏感。     

天麻素对缺血再灌注神经细胞膜的保护作用

用新生Wistar大鼠大脑皮层进行神经细胞培养 ,将培养 8d的神经细胞置于模拟“缺血”状态下 ,5h后神经细胞发生肿胀 ,胞内乳酸脱氢酶 (LDH)漏出增加 ,膜流动性下降、脂质过氧化(LPO)含量增加 ;将经过“缺血”损伤神经细胞置 1 8h模拟“再灌注” ,“再灌注”后细胞数目明显减少 ,LDH的漏出、膜流动性下降和LPO增加继续加重 ,说明细胞损伤进一步加重。经过天麻素孵育后的神经细胞“缺血”或“再灌注”后LDH的漏出及LPO含量明显低于损伤组 ,而膜流动性则明显高于损伤组。表明 :天麻素对体外培养神经细胞的缺血再灌注损伤有保护作用     

Drug-Biomacromolecule Interaction XII: Comparative binding study of sulfaethidole to bovine serum albumin by equilibrium dialysis,fluorescence probe technique,uv difference spectrophotometry and circular dichroism

Binding of sulfaethidole to bovine serum albumin was studied by equilibrium dialysis, fluorescence probe technique, uv difference spectrophotometry and circular dichroism. Equilibrium dialysis method enabled us to estimate the total number of drug binding sites of albumin molecule. For sulfaethidole, albumin had 6 primary and 40 secondary binding sites. The primary and secondary binding constants were 0.9×10⁵ M⁻¹ and 0.2×10⁶ M⁻¹, respectively. 1-Anilino-8-naphthalenesulfonate (ANS) and 2-(4′-hydroxylbenzeneazo)-benzoic acid (HBAB) were used as the fluorescence probe and the uv spectrophotometric probe, respectively. In fluorescence probe technique, results indicated that the number of higher affinity drug binding site of albumin was 1 and the number of lower affinity drug binding sites of albumin was 3, and the primary and secondary drug binding constants for bovine serum albumin were 2.15×10⁵ M⁻¹ and 1.04×10⁵ M⁻¹, respectively. In uv difference spectrophotometry, binding sites were 3 and binding constant was 1.88×10⁵ M⁻¹. The above results suggest that several different methods should be used in ompensation for insufficient information about drug binding to albumin molecule given by only one method.     

袖套法异种心脏移植模型

采用Heron袖套法进行异种（小鼠→大鼠）心脏移植，异位移植于颈部皮下，供体主动脉接受体颈内动脉，供体肺动脉接受体项外静脉，并对手术方法进行了部分改进。进行正式手术22次，成功率86％，移植后平均存活时间2．10±0．80天；该方法简单、迅速、可靠，移植于颈部易于观察，对于超急性排斥反应的观察以及免疫耐受的诱导，抗免疫排斥药物筛选是一位得推广的动物模型。     

Inter-relations between the calcium set-points of Parfitt and Brown in primary hyperparathyroidism: a sequential citrate and calcium clamp study

Abstract. The objective of the present study was to compare the calcium set-points of E. M. Brown and A. M. Parfitt obtained by sequential citrate and calcium clamp in patients with primary hyperparathyroidism and healthy controls. Twenty-six patients with primary hyperparathyroidism were investigated and compared to 22 healthy volunteers. All participants were investigated by sequential calcium lowering and raising comprising the following four phases: Phase (1) blood ionized calcium lowering of about 0·20 mmol l^-1; phase (2) steady-state (relative) hypocalcaemia of blood ionized calcium 0·20 mmol l^-1 below baseline; phase (3) blood ionized calcium is raised to about 0·20 mmol l^-1 above baseline; and phase (4) (relative) hypercalcaemia of blood ionized calcium 0·20 mmol l^-1 above baseline. Serum parathyroid hormone (1–84) was measured by an immunoradiometric assay. Blood ionized calcium was measured by a calcium selective electrode. We found the calcium set-points of Parfitt to be 1·42 mmol l^-1 (SD 0·12, n= 52) vs. 1·25 mmol l^-1 (SD 0·04, n= 44) in patients and controls, respectively (P < 0·001). The calcium set-points of Brown were 1·32 mmol l^-1 (SD 0·10, n= 26) vs. 1·13 mmol l^-1 (SD 0·04, n= 22), respectively (P < 0·001). By comparing the calcium set-points of Parfitt and Brown, a strikingly good correlation was observed, in patients (r= 0·91, P < 0·001) and in controls (r= 0·85, P < 0·001). We demonstrate in this paper in vivo that Brown's and Parfitt's calcium set-points are raised in primary hyperparathyroidism and return to normal following parathyroidectomy. The values for Brown's and Parfitt's calcium set-points are significantly different, but strikingly well correlated, supporting the view that Brown and Parfitt describe two different points on the same sigmoidal curve, corresponding to 50% and about 85% inhibition of PTH maximum, respectively. The mathematical form of the sigmoidal curve between blood ionized calcium and parathyroid hormone is very similar in primary hyperparathyroidism and normal humans.     

助孕技术的发展对人类生殖伦理观念的冲击

新近发展的助孕技术给众多不孕夫妇带来为人父母的喜悦之时，也对人们传统的生殖伦理观念形成冲击并挑战现存法律制度。人们不仅要肯定助孕技术的合理性，也要警惕其所产生的潜在的破坏性影响。合理利用该技术和制定相应的法规是避免出现伦理和社会混乱的有效途径。     

Detection of Human Heart Rate in Exercises State

作者介绍了一种动态心率检测电路，它能准确、可靠地检出在运动状态下的人体心率。电路采用两种检测技术，一种为双时值ＱＲＳ波检测法，另一种为光电脉搏检测法。