Cannabinoid receptor down-regulation without alteration of the inhibitory effect of CP 55,940 on adenylyl cyclase in the cerebellum of CP 55,940-tolerant mice

The objective of this study was to determine whether the development of tolerance to CP 55,940, a potent cannabinoid agonist, was due to changes in the receptor or second messenger system. ICR mice treated with CP 55,940 (2 mg/kg) twice a day for 6 and one-half days developed a high degree of tolerance to the pharmacological effects of CP 55,940. The ability of CP 55,940 to produce motor hypoactivity, hypothermia and immobility was reduced 163-, 97- and 19-fold, respectively. Evaluation of 3H-CP 55,940 binding to rat brain membranes indicated no difference in receptor affinity between the vehicle- and CP 55,940-treated animals. However, these binding studies revealed a 50% decrease in receptor number in the cerebellum of the CP 55,940-tolerant mice. Although cAMP is generally considered to be the second messenger for cannabinoid receptors, little difference was observed in the inhibitory effects of CP 55,940 on adenylyl cyclase activity in cerebellum between vehicle and drug-treated mice. However, there was an increase in receptor mRNA which suggests a compensation for receptor loss. There are several possible explanations for these results. There may be sufficient spare receptors such that CP 55,940-tolerant mice are capable of producing a maximal effect on the second messenger system. On the other hand, one could conclude that cannabinoid receptor down-regulation does not account for the development of tolerance to all of the effects of CP 55,940 in mice.     

10Gyγ线照射后小鼠两相邻肠段运动变化

本文用同时记录两相邻空肠段的收缩活动来观察经10Gyγ线照射后小肠运动的变化,以了解照射后是否出现逆蠕动,以便进一步分析肠套叠形成的原因.结果表明,照射后两相邻肠段出现强度不一的收缩活动,并且可以产生逆蠕动;但是这种逆蠕动发生的机率是不大的.本实验未观察到逆蠕动发生的规律性.因此,逆蠕动的产生可能是照射后发生肠套叠的部分原因.     

腺嘌呤核苷酸载体的功能和表达与心力衰竭

腺嘌呤核苷酸载体（ANT）是一种位于线粒体内膜上的转运蛋白，它在组织细胞能量产生和消耗的耦联中起关键性作用。作者就ANT的功能和表达情况及其与心力衰竭之间的关系作一综述。     

金丹肝泰1号对大鼠急性肝损伤防治作用的实验研究

用D-氨基半乳糖（D-GaIN）制备大鼠急性肝损伤模型。方法：检测血清丙氨酸氨基转氨酶（ALT）和血清天门冬氨酸氨基转氨酶（AST）的活性，观察光镜下肝组织的病理学改变，探讨对急性肝损伤的保护作用。结果：口服浸膏可显降低急性肝损伤大鼠血清ALT和AST水平，减轻肝细胞的变性坏死，其作用强度与肝炎宁相当，但弱于联苯双酯。     

股骨颈骨折粗细双螺钉内固定生物力学研究

股骨颈骨折内固定方法繁多。本文采用一粗一细加压螺纹钉，采用先进电阻应变仪方法，对股骨颈的应力分布规律在中立、外展、内收不同位置上施加50kg荷载压力．通过电阻应变计测定一耗一细两钉所承受拉、压应力优于其它内固定形式。     

胸腰椎稳定性重建方法的改进

为了改进胸腰椎脱位的治疗方法，更好地重建脊柱稳定性，设计了一种新的脊柱固定器械，由滚花钉及连接板构成，并通过椎弓根进行的一种脊柱后路短节段固定方法，脊柱固定范围限制在两个椎体间。１９８９年～１９９５年，临床应用这种新器械矫正胸腰椎脱位１２例，经１～４年随访，畸形矫正满意，固定牢固。结果表明：该器械具有手术方法简单、固定牢固和手术创伤小等优点。认为，该项技术适用于胸腰椎稳定性的重建。     

用混合粘合剂碳糊电极测定丁螺环酮

用混合粘合剂碳糊电极测定丁螺环酮张正奇，曾鸽鸣，刘传桂，黎艳飞（湖南大学化学化工系，长沙４１００８２）碳糊电极无毒，制作方便，表面更新容易，应用电位范围广，在药物分析中已有应用［１～５］。我们在液体石腊中加入添加剂，组成混合粘合剂，可显著改善电极的检...     

Hereditary characteristics of enzyme deficiency and dermatoglyphics in congenital color blindness

The hereditary characteristics of enzyme deficiency and dermatoglyphics in congenital color blindness (CCB) were studied. We propose that there is a linkage between the two loci on the X-chromosome determining CCB and glucose-6-phosphate dehydrogenase (G6PD), based on our study of a high incidence of G6PD deficiency in 156 male cases with CCB. The CCB gene is closely linked with that of G6PD deficiency from our pedigree investigations. The rise in the frequency of eight or more whorls, the low value of atd angle and the presenting rate of real palmar patterns of the thenar, hypothenar and I, areas presented the hereditary traits of congenital color blindness.     

抗莱氏支原体单克隆抗体的研制

通过细胞融合技术，筛选出ＭＡＬ－１和ＭＡＬ－２两株抗莱氏支原体（Ａ．Ｌａｉｄｌａｗｉｉ，Ａ．Ｌ）单克隆抗体（单抗）。通过ＳＤＳ－ＰＡＧＥ和Ｗｅｓｔｅｒｎ印迹法测得单抗相对应的抗原分子量均为６７．４６ｋｕ。用间接免疫荧光法（ＩＦＡ）检测，单抗与细胞培养中另外３种常见污染的支原体和呼吸道肺炎支原体无交叉反应。将单抗用于检测支原体污染的细胞培养物，结果表明，此单抗能特异性地检出莱氏支原体。故可用其推断支原体污染途径，便于制定防治措施。