红细胞聚集与取向对其悬浮液电阻抗的影响——I.实验研究

本文通过测量具有不同流变特性的红细胞悬浮液电阻抗的动态与静态变化，研究了红细胞聚集与取向对其悬浮液电阻抗的影响。首次得出以下结论：１．红细胞聚集使其悬浮液电阻抗显著减小。２．由于低切变率下红细胞聚集与高切变率下红细胞取向的共同影响，使血液电阻抗随切变率的变化具有双相特性。这增加了对血液电特性的新认识，表明可利用电阻抗测定红细胞聚性。     

冬凌草愈伤组织诱导及细胞培养的研究

用组织培养、细胞悬浮培养和单细胞平板培养技术,诱导出冬 凌草愈伤组织,并探讨 了细胞悬浮培养时间、培养方法和接种密度对冬凌草单细胞平板培养植板率的影响。结果表 明：从冬凌草叶和嫩茎诱导愈伤组织,以 MS 2,4D 1 mg/L NAA 0.5 mg/L 培养基较好 ,愈 伤组织诱导率高达 96.80%。用普通单细胞平板培养法培养冬凌草单细胞的植板率很低,而 以悬浮培养 15～18 d 的单细胞为材料,接种密度为 5×103个/毫升时,进行条件培养 和 看护培养,植板率达 21.63%。本研究结果可供利用细胞培养技术筛选冬凌草高产冬 凌草素细胞株时参考。     

聚乙烯醇在α-Al_2O_3颗粒上的吸附平衡

考察了温度、悬浮液浓度、相对分子质量对聚乙烯醇 ( PVA)在 α- Al2 O3颗粒上吸附的影响 ,实验测定了相对分子质量为 80 0 0 0和 56 0 0的 PVA在 2 88.1 5K、2 98.1 5K和 30 8.1 5K、α- Al2 O3悬浮液质量浓度为 0 .0 5、0 .1 0和 0 .1 5时的吸附等温线 ,用 Langmuir吸附模型对实验数据进行了关联。结果表明 ,吸附量随悬浮液浓度的增加或温度的升高而降低 ,随 PVA相对分子质量的增加而增加。PVA相对分子质量越大 ,其吸附等温线受温度、悬浮液浓度的影响也越大。     

Gastrointestinal absorption of phenytoin from an oil-in-water microemulsion

The absorption profile of phenytoin Na emulsion were examined compared to that of phenytoin suspension after oral administration in the rat. The corn oil-in-water emulsion, particle size of 184±57.8 nm, was prepared using a microfludizer, and phenytoin Na added by shaft homogenizer. The phenytoin emulsion or suspension, 100 mg/kg, were intubated intragastrically using oral dosing needle and blood samples were withdrawn via an indwelling cannula from the conscious rat. Plasma concentrations of phenytoin were measured with HPLC using phenacetin as an internal standard. The plasma concentration versus time data were fitted to a one compartment open model and the pharmacokinetic parameters were calculated using the computer program, Boomer. The phenytoin plasma concentrations from the emulsion at each observed time were about 1.5–2 times higher than those from the suspension, significantly at time of 5, 6 and 7 hr after administration. The absorption (k_a) and elimination rate constant (k_e) were not altered significantly, however the AUC increased from 65.6 to 106.7 μg·hr/ml after phenytoin suspension or emulsion oral administration, respectively. From an equilibrium dialysis study, the diffusion rate constant (k_IE) was considerably higher from the phenytoin Na emulsion (0.0439 hr⁻¹) than phenytoin suspension (0.0014 hr⁻¹).     

新三联疗法治疗幽门螺杆菌阳性十二指肠溃疡的对照研究

目的：探讨硫糖铝新三联疗法治疗幽门螺杆菌（ＨＰ）阳性十二指肠溃疡的疗效和安全性。方法：将ＨＰ阳性十二指肠溃疡患者随机分为３组：Ａ组（ｎ＝４５）和Ｂ组（ｎ＝４２）分别接受硫糖铝＋呋喃唑酮＋兰索拉唑和胶体铋剂＋阿莫西林＋甲硝唑治疗,Ｃ组（ｎ＝４３）接受呋喃唑酮＋兰索拉唑治疗,疗程均为２周。停药４周后复查胃镜,了解ＨＰ根除率和溃疡愈合率,并随访１年。结果：停药４周后Ａ组、Ｂ组、Ｃ组ＨＰ根除率和溃疡愈合率     

Successful treatment of tracheomalacia associated with esophageal atresia without a tracheoesophageal fistula by aortopexy: Report of a case

Tracheomalacia (TM) is well known as a complication associated with esophageal atresia (EA) and tracheoesophageal fistula (TEF); however, the occurrence of TM requiring surgical treatment in a patient having EA without a tracheoesophageal fistula has never been reported. We describe herein a rare case of TM associated with EA without TEF. Respiratory distress was caused by compression of the trachea by a severely dilated upper esophageal pouch with weakness of the tracheal wall. Aortopexy was performed, and an excellent postoperative result was achieved.     

Potential anti-anxiety, anti-addictive effects of LY 354740, a selective group II glutamate metabotropic receptors agonist in animal models

Despite there being a lot of biochemical data about metabotropic glutamate (mGlu) receptors, our knowledge of the behavioural effects of mGlu receptor agonists/antagonists is still inadequate. LY 354740 is a systemically active agonist of group II mGlu receptors. After peripheral administration, LY 354740 produced anxiolytic-like effects in the conflict drinking test in rats and a four-plate test in mice. It was also found that LY 354740 decreased spontaneous locomotor activity in mice, but did not disturb motor coordination. In behavioural models of depression including the despair test and a tail suspension test, LY 354740 did not produce antidepressant-like effects. LY 354740 inhibited the naloxone-induced symptoms of morphine withdrawal in morphine-dependent mice. The above results indicate that agonists of group II mGlu receptors may play a role in the therapy of anxiety and/or drug-dependence states. The brain sites of action of LY 354740 need to be identified and the mechanism of both the above described effects remains to be elucidated.     

超声搅拌悬浮液进样FAAS法测定铁皮石斛中的微量元素

 目的研究铁皮石斛中微量元素的分析方法。方法样品在(80±2)℃烘干4 h，研磨过200目筛，然后加入0.15%琼脂悬浮液5 mL，用超声搅拌混匀后直接上机测定。结果测定结果与传统湿法一致，t检验表明两者无显著性差异，相对误差小于0.96%。结论该方法简便、快速、准确。     

野罂粟悬浮细胞培养及其野罂粟生物碱的产生

对野罂粟细胞悬浮培养及其次生代谢物野罂粟生物碱进行了研究。结果显示，在培养的中后期补充营养物质可促进细胞生长及生物碱的累积。3％的蔗糖浓度对细胞的生长最为有利；4％的蔗糖对总生物碱的累积最为适宜。悬浮细胞在pH5．7的培养基中生长最为旺盛，而在pH5．4的培养基中总生物碱的含量最高。取IC法测定野罂粟悬浮培养物中野罂粟碱的含量为0．0235mg/g DW，黑龙辛甲醚的含量为0．022mg/g DW。