Expression and kinetic characteristics of muscle type acetylcholine receptors in Xenopus oocytes

ＥｘｐｒｅｓｓｉｏｎａｎｄｋｉｎｅｔｉｃｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｍｕｓｃｌｅｔｙｐｅａｃｅｔｙｌｃｈｏｌｉｎｅｒｅｃｅｐｔｏｒｓｉｎＸｅｎｏｐｕｓｏｏｃｙｔｅｓＣｈｅｎＨｏｕｃｈａｎｇ（陈厚昌），ＷｕＳｈｕｇｕａｎｇ（吴曙光）（Ｄｅｐａｒｔ...     

化工废水中N-亚硝基二正丙胺的吹扫捕集-GC-MS测定法

目的建立简单快速提取并测定N-亚硝基二正丙胺(NDPA)的方法。方法采用Trap3捕集管,利用标准吹扫捕集程序(吹扫气体流速40ml/min,吹扫时间11min,解吸温度225℃,解吸时间4min,烘烤温度230℃,烘烤时间10min),有效富集了化工废水中μg/L级的NDPA,建立了吹扫捕集(P&T)气相色谱质谱联用(GC-MS)化学源(CI)选择离子模式(uSIS)快速、准确分析废水中NDPA的分析方法。结果方法的相对标准偏差为7.5%;废水的加标回收率在62.60%～96.31%;在5～30μg/L范围内线性良好,线性回归系数为0.978;方法的最低检出限为3μg/L。结论采用P&T-GC-MS/CI/uSIS法可用于化工废水中半挥发性有机物NDPA的测定。     

益气养阴清热法合化疗治疗急性髓细胞白血病

目的 :探讨益气养阴清热法为基本治法配合化疗治疗急性髓细胞白血病的临床疗效。方法 :用黄芪、太子参、白术、生地、黄精、天门冬、麦门冬、白花蛇舌草、半枝莲、小蓟、蒲公英、甘草组方。配合 DA、HA、IA等联合化疗方案。部分 M3 患者应用维甲酸、亚砷酸治疗。部分患者静脉滴注榄香稀乳、参脉、丹参等辅助治疗。结果 :1 5 6例完全缓解 1 1 3例 ,完全缓解率 72 .4% ;部分缓解 2 0例 ,部分缓解率 1 2 .8% ;总缓解率 85 .3% ;3年生存率 37.2 % ,5年生存率 2 2 .1 %。 32例老年患者完全缓解率 43.8% ,明显低于其他年龄段 ( P<0 .0 1 )。应用维甲酸治疗的 1 8例 M3 完全缓解 1 5例 ,完全缓解率 83.3%。亚砷酸治疗 3例完全缓解 2例。结论 :益气养阴清热法作为中医的基本治法治疗急性髓细胞白血病符合临床实际。中西医结合治疗急性髓细胞白血病缓解率高 ,患者易于接受 ,有比较高的实用价值。其中提示老年患者治疗比较困难。     

Differential sensitivity of mouse oocytes to colchicine-induced aneuploidy

Unpublished results from our laboratory showed that colchicine increased the incidence of hyperploid mouse metaphase II (MII) oocytes when injected at the same time as human chorionic gonadotrophin (HCG). The objective of the present study was to determine whether the time of administering colchicine influenced the incidence of aneuploidy in MII oocytes. CD-1 mice were given pregnant mare's serum (PMS) and 48 hr later, HCG. An intraperitoneal injection of 0.2 mg/kg colchicine was given at +4, +2, 0, -2, or -4 hr relative to HCG. Oocytes were collected 17 hr post-HCG and processed, and chromosomes were subsequently C-banded. The percentage of hyperploid oocytes was 0.77, 2.56, 5.71, 7.79, 3.54, and 2.70 for control, +4, +2, 0, -2, or -4 hr pre/post-HCG, respectively. Chi-square analyses of these data demonstrated that colchicine significantly increases the proportion of aneuploid oocytes, and that the relative sensitivity of colchicine-induced aneuploidy depends upon the time that this drug is administered relative to HCG.     

Semiconductor manufacturing: an introduction to processes and hazards

Recent studies suggest that semiconductor workers have an increased incidence of work-related illness. Semiconductor manufacturing is a chemically intensive industry involving many potentially hazardous operations. As this industry moves into new geographic areas, health care professionals will be asked to evaluate medical or workplace conditions associated with unfamiliar and complex production processes. This paper provides an overview of semiconductor manufacturing processes for these health practitioners. Each step of device fabrication is detailed with its attendant chemical and physical hazards. Broader concepts of industrial control technology, clean room ventilation, and ergonomics are explained. The hazards are tabulated to allow rapid assessment of the risks inherent to each processing step. References have been chosen to guide the reader to more indepth information.     

Multiple pancreatic metastases from clear cell renal carcinoma: Diagnosis with chemical shift magnetic resonance imaging before surgery

We present a case in which multiple pancreatic tumours were diagnosed as metastatic clear cell renal carcinomas with chemical shift MRI (CSI) before surgery. Radiologists may be unable to recognize the loss of intensity on CSI macroscopically. We believe that it is useful to make subtraction images and calculate signal intensity on CSI, even if the lesions are multiple metastatic tumours.     

大型聚酯装置工程技术研究与开发新进展

介绍了国内聚酯工业工程技术开发和实施的情况以及成功的经验，并对国产化聚酯工程技术的应用提出了展望和建议。     

高频等离子体化学气相淀积法制备TiO2超细粒子

利用ＴｉＣｌ４＋Ｏ２体系，在高频等离子体化学气相淀积反应器中合成了纯度高、粒度细的ＴｉＯ２粒子。考察了工艺条件对ＴｉＯ２粒子物性的影响；探讨了ＴｉＯ２粒子晶型控制的方法，金红石型质量分数可通过工艺条件控制；探讨了ＴｉＯ２粒子晶型控制的方法。金红石型质量分数可通过工艺条件控制，减少ＴｉＯ２单体浓度可提高金红石型质量分数；也可通过在原料ＴｉＣｌ４中添加ＡｌＣｌ３等晶型转化剂，使可转化为单一金红石型Ｔｉ     

Photodynamic therapy of tumours: value of quantum chemical procedures for characterization of new drugs. Prediction of the electronic structure of zinc(II) phthalocyanine with special emphasis on triplet state excitation energies

Zinc(II) phthalocyanine is the active component of the liposomal formulation CGP 55847 which showed a high activity in photodynamic therapy in a variety of animal tumours. The photophysical properties of zinc(II) phthalocyanine have been studied in detail and compared to those of Photofrin, the only sensitizing agent approved so far for phase III/IV clinical trials. Since the efficacy of photodynamic therapy intrinsically depends on the spectroscopic features of the sensitizer, quantum chemical methods have proven to be an efficient means for optimizing chemical structures. As will be shown, a simple modification of the time-honoured INDO model of Pople allows a prediction of the singlet and triplet state properties of molecules of the size of zinc(II) phthalocyanine with an rms error of ≤ 1000 cm⁻¹.