转化生长因子-α在血液透析过程中的水平变化及其临床意义

目的：探讨血清及尿液中转 化生长因子α（ Ｔ Ｇ Ｆα）含量变化对血液 透析（ Ｈ Ｄ） 的影响。方法：采用放 射免疫分析法,对 ４９ 例维持性 Ｈ Ｄ 患者血清 及 １２ 小时 尿液进行 Ｔ Ｇ Ｆα的 水平检测, 以 ３０ 例健康 人作为对 照。结果：与对照组比较, Ｈ Ｄ 前 Ｔ Ｇ Ｆα水平明显降低（ Ｐ＜ ０．０１））。与 Ｈ Ｄ 前比较, Ｈ Ｄ 后 Ｔ Ｇ Ｆα水平增高十 分显著（ Ｐ＜ ０．０５）;１２ 小时尿液中 Ｔ Ｇ Ｆα水平明显高于对照组,有显著性差异（ Ｐ＜ ０．０５）;使用铜仿膜与聚砜膜透析器患者血清 Ｔ Ｇ Ｆα水平明显高于醋酸纤维膜与血仿膜组。结论： Ｔ Ｇ Ｆα水平明显改变参与了 Ｈ Ｄ 患者 的发病机理及病理生理过程;使用铜仿膜和聚砜膜透析器可使 Ｈ Ｄ 患者 Ｔ Ｇ Ｆα含量增高。     

大肠杆菌HX88108膜孔蛋白初步研究

为了解大肠杆菌ＨＸ８８１０８耐药机理中有无膜孔蛋白缺失参与,用十二烷基磺酸钠－聚丙烯酰胺凝胶电泳（ＳＤＳ－ＰＡＧＥ）检测了大肠杆菌ＨＸ８８１０８的膜孔蛋白,并与膜孔蛋白标准株进行比较分析。结果发现：大肠杆菌ＨＸ８８１０８具有膜孔蛋白ＯｍｐＦ、ＯｍｐＣ,其耐药与膜孔蛋白缺失所致的抗生素进入减少无关     

A comparison of T4 and T7 dermatomal levels of analgesia for caesarean section using the lumbar epidural technique

We compared analgesia to the T₄ dermatomal level with analgesia to the T₇ level with and without prophylactic intramuscular administration of ephedrine 25 mg to determine the adequacy and side effects of such analgesia for caesarean section. Unmedicated patients were prehydrated (727 ± 303 ml of saline solution) and kept in a left lateral tilt position. Sufficient three per cent chloroprocaine was given to obtain analgesia to the T₇ (T₆-T₈) dermatomal level (455 ± 128 mg) or to the T₄ (T₃-T₅) dermatomal level (758 ± 168 mg). Patients who received analgesia to the higher level required less narcotic than those who received analgesia to the lower level (21 per cent versus 48 per cent) (p < 0.05). The incidence of hypotension in patients with analgesia at the T₄ level was 21 per cent for those receiving ephedrine and 64 per cent for those who did not receive ephedrine (p < 0.05). Intramuscular administration of ephedrine 25 mg was not associated with increased plasma levels of norepinephrine, epinephrine or dopamine. There was no difference in Apgar score, behavioural test scores, neonatal acid-base status or oxygenation in children of mothers in the different groups. We conclude that a T₄ dermatomal level of analgesia, combined with intramuscular administration of ephedrine 25 mg, provides more maternal comfort than a T₇ level of analgesia does, with or without ephedrine, and is without significant maternal or foetal side effects.     

半夏栽培生态学研究

目的 半夏栽培生态研究。方法 对半夏Pinellia ternata不同质量的种茎进行田间栽培实验。结果 半夏块茎收获量随种茎质量增加，但相对增重则随着种茎质量的增加而减少；子块茎、珠芽和种子数量随着块茎质量而增加，半夏繁殖系数随半夏种茎质量增大而增大；统计表明叶柄数量、地上部分干重、珠芽总数、最大株芽质量、花总数与种茎的质量呈极显著正相关；珠芽总数与叶柄数量呈极显著正相关；子块茎数与种茎的增重呈负相关，而叶柄数也与种茎增重负相关。结论 半夏栽培中营养生长与生殖生长、地上部分生长与地下部分生长相互制约。     

豆蔻挥发油β-环糊精包含工艺研究

目的：研究豆蔻挥发油β环糊精包合的最佳工艺。方法：正交试验法，考察挥发油利用率指标。结果：优选出包合工艺为：豆蔻挥发油：β环糊精1：8，包合温度50℃，包合时间2h，挥发油利用率为79．7％。结论：此工艺适合大生产。     

液相色谱法测定吗氯贝胺及其多剂量口服后在人体的药动学(英文)

目的 :建立人血浆中吗氯贝胺的反相高效液相色谱检测方法 ,并研究中国健康男性志愿者多剂量口服吗氯贝胺后的药动学特征。方法 :采用反相高效液相色谱法测定人血浆中吗氯贝胺含量。血浆样品在碱性条件下 (pH 11)用二氯甲烷提取处理。色谱柱为 μ BondapakTM C18(12 5 ,10 μm ,3.9mm× 15 0mm)。流动相为乙腈 :0 .0 6 7mol·L- 1磷酸二氢钾溶液 (1∶5 ,V/V ,pH 2 .6 ) ,2 4 0nm检测。内标为甲氧氯普胺。应用 3P97程序拟合药动学参数。结果 :吗氯贝胺在 4 0～ 4 0 0 0 μg·L- 1范围内线性关系良好 (r =0 .9999) ,方法回收率在 99%～10 3%之间 ,日内日间RSD小于 8.14 %。吗氯贝胺血药浓度 时间曲线符合一室模型 ,主要稳态药动学参数Cmax为 (3911± 14 2 ) μg·L- 1;Tmax为 (1.4 2± 0 .2 0 )h ;T1/2 (kel) 为 (2 .6± 0 .3)h ;AUC0 2 4 为(2 2 5 83± 182 1) μg·h·L- 1;MRT为 (4.76± 0 .2 5 )h ;CL/F(s) 为 (2 1.2± 1.2 )L·h- 1。结论 :该方法快速、准确、灵敏度高、专属性强 ,可应用于吗氯贝胺的血药浓度测定     

甲醇合成过程中基于MAS的故障诊断方法

针对甲醇合成生产过程的特点和故障产生机制,将多智能体系统(MA S)技术引入到生产过程的故障诊断中,把生产过程划分为一些相对独立的组件,分派特定的诊断智能体对其进行故障诊断,通过智能体之间的协作,充分利用过程中的局部信息而给出整个过程的故障诊断结果。通过仿真实验,得到了满意的结果。     

Imaging of Vulnerable Plaques Using Near-Infrared Spectroscopy for Risk Stratification of Atherosclerosis

Large randomized trials have shown that lowering the concentration of LDL cholesterol with statins reduces vascular morbidity and mortality rapidly, with further benefit emerging during each year of treatment allocation. But, limited evidence is available about the long-term efficacy and safety of statin treatment. Long-term follow-up of surviving trial participants allows direct assessment of the benefits (and any hazards) of a sustained reduction in LDL cholesterol concentration during the post-trial period. Post-trial follow-up of several large statin trials (of which the Heart Protection Study was the largest) confirms that the substantial absolute benefits and cost-effectiveness of statin therapy were, in fact, underestimated in previous analyses restricted to the “in-trial” periods of randomized studies. Reassuringly, no adverse effects on cancer incidence or non-vascular mortality emerged during the extended follow-up of the Heart Protection Study. These findings support the prompt initiation and long-term continuation of statin therapy in individuals at increased vascular risk.     

Presentation of floating mass transducer and Vibroplasty Couplers on CT and Cone Beam CT

Various titanium coupling elements, Vibroplasty Couplers, maintaining the attachment of the Floating Mass Transducer (FMT) of the active middle ear implant Vibrant Soundbridge (VSB) to the round window, the stapes suprastructure or the stapes footplate are in use to optimally transfer energy from the FMT to the inner ear fluids. In certain cases it is of interest to radiologically verify the correct position of the FMT coupler assembly. The imaging appearance of FMT connected to these couplers, however, is not well known. The aim of this study was to present the radiological appearance of correctly positioned Vibroplasty Couplers together with the FMT using two different imaging techniques. Vibroplasty Couplers were attached to the FMT of a Vibrant Soundbridge and implanted in formalin fixed human temporal bones. Five FMT coupler assemblies were implanted in different positions: conventionally to the incus, a Bell-Coupler, a CliP-Coupler, a Round Window-Coupler and an Oval Window-Coupler. High spatial resolution imaging with Multi-Detector CT (MDCT) and Cone Beam CT (CBCT) was performed in each specimen. Images were blind evaluated by two radiologists on a visual basis. Middle ear details, identification of FMT and coupler, position of FMT coupler assembly and artefacts were assessed. CBCT showed a better spatial resolution and a higher visual image quality than MDCT, but there was no significant advantage over MDCT in delineating the structures or the temporal bone of the FMT Coupler assemblies. The FMT with its coupler element could be clearly identified in the two imaging techniques. The correct positioning of the FMT and all types of couplers could be demonstrated. Both methods, MDCT and CBCT, are appropriate methods for postoperative localization of FMT in combination with Vibroplasty Couplers and for verifying their correct position. If CBCT is available, this method is recommended due to the better spatial resolution and less metal artifacts.