Incisional healing in rats treated with diethyl maleate

Diethyl maleate (DEM) which binds and thus depletes tissue glutathione levels was used to aggravate the injury and to determine its effect on incisional healing. A 5 cm dorsal midline skin incision was performed on 40 albino Wistar rats in two groups and then closed by interrupted sutures. Groups received 0.9% NaCl and DEM at a dosage of 1 mg/kg/day intraperitoneally for seven days, respectively. On postoperative days 7 and 14, histopathological assessment and tensile strengths were measured. The DEM treated group had a marked inflammation with poorly defined collagen formation and the tensile strength measurements revealed a significant decrease (p <0.001) on the 7t day. On the other hand, the first group showed better collagenization and a lesser degree of inflammation. However, on the 14th day, there was no noticeable histopathological difference between the two groups; but, tensile strength values of the second group were still lower (p <0.05). In this animal model, DEM postponed the healing process and reduced the tensile strength.     

示差导数光谱法测定感冒通片中双氯灭痛和扑尔敏的含量

本文利用示差导数光谱法对感冒通片中双氯灭痛和扑尔敏进行定量测定。本法用同一样品液,在同一测定条件下完成,具有操作简便、快速、灵敏度高和重现性好等特点,双氯灭痛和扑尔敏的平均回收率分别为99.5%和97.3%,变异系数分别为0.42%和0.63%.     

毛细管区带电泳法测定复方马来酸依那普利片中两组分含量

用毛细管区带电泳法同时测定复方马来酸依那普利片中两组分含量。以咖啡因为内标，２０ｍｍｏｌ／Ｌ硼砂—２０ｍｍｏｌ／Ｌ磷酸二氢钠（４９∶５１，ｐＨ８６）为运行缓冲液，在７ｍｉｎ内完成分离。马来酸依那普利和氢氯噻嗪的线性范围分别为８０～６４０μｇ／ｍＬ（ｒ＝０９９９９）和５０～４００μｇ／ｍＬ（ｒ＝０９９９３）。平均回收率分别为１０１０％和１０１１％，ＲＳＤ分别为１０％和１７％，ｎ＝５。     

Time course of the effect of intravenous dimetindene maleate

Summary In order to evaluate the time course of its effects, dimetindene maleate has been investigated in a histamine provocation model in man. Eight healthy male volunteers were treated i. v. with 4 mg dimetindene maleate or sodium chloride solution in a double blind, cross over study. Intracutaneous histamine injections were given at –1, 2, 5, 14, 17, 20, 23, 26, and 29 h following drug administration and the areas of flares and wheals were measured after 5, 10, 20, and 30 min. There was strong inhibition of the development both of flares and wheals, which was more pronounced for the former. Baseline adjusted areas under the curve differed significantly following drug and placebo treatment. The maximum effect was observed at 2 h.The mean residence time of the inhibitory effect was calculated to be 13 h compared to the mean residence time of dimetindene in blood of 5 h, which indicates a non-linear relationship between blood level and effect.     

Behavioral effects of MK-801 in the rat

Several experiments were conducted to study the effects of the noncompetitive N-methyl-d-aspartate (NMDA) receptor antagonist, MK-801, on learning and memory in the rat. Rats displayed impaired performance on several sensorimotor tests and appeared grossly intoxicated when treated IP with 0.2 mg/kg MK-801, but not when treated with lower doses (0.05 or 0.1 mg/kg). Postacquisition performance on two spatial learning tasks involving working memory protocols (reinforced alternation and radial arm maze) was impaired by MK-801 at intoxicating doses (0.2 mg/kg) but not at lower doses (0.05 or 0.1 mg/kg). Using a position habit reversal task, we found that rats could learn to reverse a position habit while under the influence of a nonintoxicating dose of MK-801 (0.1 mg/kg), but when tested on the following day performed as if they did not recall what they had learned. Thus, acute administration of a nonintoxicating dose of MK-801 disrupts the retention of new information learned under the influence of the drug but does not interfere with the performance of tasks that are well learned before the drug is administered. Whether the performance deficits on the spatial learning tasks observed only following intoxicating doses of MK-801 reflect an effect on memory is not clear.     

马来酸单甲酯构型转化反应的研究

目的 :探讨硫脲、盐酸和亚硫酸氢钠催化下马来酸单甲酯的构型转化反应。方法 :正交试验和方差分析。结果 :盐酸用量和反应时间对结果的影响具统计学差异 ,而硫脲和亚硫酸氢钠的用量对结果的影响不具备统计学差异。结论 :盐酸用量和反应时间对马来酸单甲酯的构型转化反应均有高度显著性影响 ,而硫脲和亚硫酸氢钠的用量则无     

MK-801 neurotoxicity in male mice: histologic effects and chronic impairment in spatial learning

Several histological and behavioral experiments were conducted to investigate the neurotoxic effects of MK-801 in male mice. Moderate subcutaneous (s.c.) doses of MK-801 (0.5 and 1.0 mg/kg) induced the formation of intracytoplasmic vacuoles in pyramidal neurons in layers III and IV of the posterior cingulate/retrosplenial (PC/RS) cortex in 50% and 100% of the mice from the two respective treatment groups. Electron microscopic analysis of the vacuoles indicated that mitochondria and endoplasmic reticulum are the cellular organelles most prominently involved in this pathomorphological change. Treating mice with a high systemic dose of MK-801 (10 mg/kg s.c. or intraperitoneal (i.p.)) caused selective, irreversible degeneration of a small number of PC/RS cortical neurons. Compared to saline controls, the acquisition performance of mice treated i.p. with 10 mg/kg MK-801 was chronically impaired on a spatial learning task (modified hole board food search task) when tested at several posttreatment intervals (up to at least 5 months), although the groups did not differ on activity or sensorimotor tests conducted 2 weeks posttreatment. In summary, MK-801 caused histopathological changes in the mouse brain similar to those observed in the rat. Furthermore, high dose MK-801 treatment that killed a small number of mouse PC/RS cortical neurons resulted in a chronic acquisition impairment in spatial learning, an effect not previously demonstrated in any species.     

用HPLC法测定马来酸依那普利片的含量和有关物质

目的:采用改进的HPLC法测定马来酸依那普利片中马来酸依那普利和有关物质的含量。方法:采用HypersilBDS C8色谱柱(250 mm×4.0 mm,5μm ID);0.001 mol/L磷酸二氢铵溶液(用磷酸调节pH值至2.0)-甲醇(60:40);检测波长215 nm。结果:马来酸依那普利在0.1～0.3 mg/ml范围内线性关系良好(r=0.999 9);方法的平均回收率为99.8％。依那普利与有关物质之间分离良好。结论:本法有较高的回收率、精密度和重现性。     

咳特灵胶囊中马来酸氯苯那敏的高效毛细管电泳-电导法测定

建立了咳特灵胶囊中马来酸氯苯那敏含量的高效毛细管电泳 -电导测定法。采用未涂层弹性融硅石英毛细管柱 (4 0 cm× 75 μm) ,1× 10 -3 mol/L Na2 HPO4溶液为电泳介质 ,重力方式进样 ,室温下 15 k V恒压电泳分离 ,电导检测。马来酸氯苯那敏在 9.8～ 117.6μg/ml浓度范围内线性关系良好 ,平均回收率 96.8% ,RSD为 1.9%。