人工晶体植入术中晶体后囊破裂的原因分析及处理

分析白内障摘除并后房型人工晶体植入术中发生晶体后囊破裂的原因和讨论处理方法。分析５５例（５５眼）白内障摘除并后房型人工晶体植入术中发生晶体后囊破裂的原因，裂口形态，大小及部位。根据具体情况采用不同处理方法。该术中合并症好发于抽吸晶体皮质及植入人工晶体时，各２１例（３８．２％），后囊破裂大小约３ｍｍ的３９例（７０．９％），５ｍｍ的１３例（２３．６％）。大于６ｍｍ的３例（５．５％）。后囊破裂的部位及形     

苯DNA加合物研究进展(综述)

苯ＤＮＡ加合物研究进展（综述）李桂兰，常平综述徐伯洪审校（中国预防医学科学院劳动卫生与职业病研究所，北京１０００５０）我国职业接触苯的工人约有５０万，长期接触苯可引起白血病。苯与其它实质性肿瘤的问题也有报道［１，２］。世界癌症研究机构（ＩＡＲＣ）１９...     

薄层色谱溶剂系统的最优化方法——Ⅵ.均匀设计法的再探讨

就第Ⅱ报及第Ⅴ报提出的用于选取薄层色谱最佳溶剂系统的均匀设计法进行了进一步的改进及实验验证,使其更趋完善。结果表明,该法不仅适用于已知混合物,而且适用于未知混合物,是一种比较简捷、快速且行之有效的方法。     

提高H2O2/甲酸体系选择性氧化抽提脱硫效率的研究

为了降低焦化蜡油(CGO)-甲酸／H2O2选择性氧化体系中H2O2的无效分解速度，屏蔽重金属离子对H2O2分解的催化效应，考察了造纸行业中常用的硅酸钠、硅酸镁和乙二胺四乙酸(EDTA)等稳定剂和螯合剂的加入对有机溶剂抽提后CGO中含硫量的影响。实验结果表明，EDTA可以很好地和重金属离子螯合，氧化后CGO抽余油中硫含量大幅降低。     

黄芪水提及除杂工艺条件的筛选研究

目的：优选黄芪水煎及除杂工艺的最佳条件。方法：采用L3(3^4)正交表，以黄芪甲甙的提取率和干膏收率综合考察黄芪的提取工艺条件；采用黄芪甲甙与干膏的变化多少作为Ⅱ型ZTC1 1天然澄清剂用于黄芪水提液除杂的考察指标。结果：黄芪采用饮片(厚2～3cm)，加10倍量水提取3次，每次1.5小时，黄芪甲甙的提取率在90％以上；提取液浓缩至生药／水=1／3时，采用Ⅱ型ZTCl 1天然澄清剂(8％B、4％A组分)除杂效果要好于传统的醇沉方法，且能降低成本，缩短工时。结论：本试验的工艺条件和除杂工艺符合大生产的要求，并能降低成本，保留黄芪水提液中其他有效成分，具有推广意义。     

宣肺清热颗粒剂稳定性研究

目的:研究宣肺清热颗粒剂中橙皮甙热稳定性变化,为该颗粒剂有效期的确定、制剂生产、贮存条什提供实验参考依据。方法:采用加速实验法对橙皮甙热稳定性进行研究,用甲醇超声提取样品,HPLC进行含量测定。根据Arrhenius公式处理数据。结果:Arrhenius公式得室温下的速度常数K298=3.38×10-5/h,得出常温下该颗粒剂以橙皮甙为指标的有效期为3.6年。结论:宣肺清热颗粒剂稳定性好,初步符合中药稳定性要求。     

Supercritical fluids in medical radioisotope processing and chemistry,Part II: Applications – real and demonstrated

In Part I of this review series, an overview was presented on what the basic properties of supercritical fluids are and how they can, and are being used in many of today's industries as solvents for extraction, chromatography and reaction. A good part of this overview detailed the kinds of equipment needed, and techniques on how to use them for optimal performance. Part II of this series will delve into specific applications of supercritical fluid technology as it relates to aspects of medical isotope processing. The reader will note that very few applications of this technology to Nuclear Medicine have been published. Many potential applications cited within the context of this review derive from preliminary studies carried out in the author's laboratory. These examples are presented to spark interest in future developments of this nature. Copyright © 2003 John Wiley & Sons, Ltd.     

Guided bone regeneration for immediate non‐submerged implant placement using bioabsorbable materials in Beagle dogs

The aim of the present study was to evaluate the combined application of different bioabsorbable materials for healing of residual peri‐implant defects after placement of non‐submerged implants into fresh extraction sockets. Second and third mandibular premolars were extracted from 10 Beagle dogs, the coronal part of the distal sockets were surgically enlarged and this was followed by immediate placement of specially designed hollow‐screw non‐submerged dental implants. For each animal, the coronal peri‐implant defects were further treated with one of the 4 following procedures: 1) no treatment, control site: 2) grafting with porous hydroxyapatite (HA); 3) collagen membrane tightly secured around the implant and over the defect and 4) grafting with HA covered with a collagen membrane. After 16 weeks of healing, specimens were removed from the mandibule and prepared for a histomorphometric evaluation. The bone-to-implant contact length (BIC) was measured and compared amongst the different treatment modalities. In the defect area, the irregular bone regeneration was similar between all the treatment procedures ( P >0.10). In the sites covered with a collagen membrane alone, the total BIC (47%) was greater than in control sites (28.7%. P <0.05) or sites grafted with HA (22.2%, P <0.02). Total BIC in sites treated with the HA‐membrane combination (43%) was only significantly different from sites treated with HA ( P <0.10). It is concluded that the use of bioabsorbable materials results in a limited increase of osseointegration when used in conjunction with immediate placement of non-submerged implants, although the principle of the one stage surgical approach can be maintained.     

食管癌加速超分割放疗的临床研究

目的：评价加速超分割放射治疗食管癌的疗效。方法：食管鳞癌９８例随机分为常规组和加速超分割组。常规组：１８０～２００ｃＧｙ／次，５次／周，总量６０００～７０００ｃＧｙ／６～７周；加速超分割组：１５０ｃＧｙ／次，２次／日，间隔６小时，总量５４００ｃＧｙ／３５周。两组病人均采用６０Ｃｏ远距离外照射。结果：常规组１，３，５年生存率分别为４６％（２３／５０）、２０％（１０／５０）、１２％（６／５０）；加速超分割组１，３，５年生存率分别为７０８％（３４／４８）、３９６％（１９／４８）、２９２％（１４／４８），加速超分割组明显优于常规组（Ｐ＜００５），而两组放疗反应和并发症无明显差异。结论：加速超分割放疗能明显提高食管癌病人的生存率，但不增加放疗反应及并发症。     

Methodological Studies on Genomic DNA Extraction and Purification from Plant Drug Materials

本文探讨了菊科９种植物和地胆草的４种对口商品药材基因组ＤＮＡ提取与纯化的原理、方法通过对３种常用植物基因组ＤＮＡ提取方法（ＣｓＣｌ梯度超速离心法、ＣＴＡＢＣｓＣｌ梯度超速离心法和ＣＴＡＢ微量提取法）的条件摸索在ＤＮＡ产率、纯度以及提取纯化过程中影响ＰＣＲ扩增因子方面进行比较，认为ＣＴＡＢ微量提取法是植物类药材基因组ＤＮＡ一种比较省时、有效、经济的提取方法