热分析方法对几种不同产地山药的鉴别

目的：考察热分析方法对不同种质、地域山药鉴别的可行性。方法：对5个产地的山药分别在氮气与空气气氛下的DTA和DTG曲线进行分析，根据其图谱的特征差异进行鉴别。结果：不同种山药的DTA，DTG图谱，不同种、不同地域山药的DTG图谱均有差异。结论：此方法可用于不同种、不同地域山药的鉴别。     

Polymer hydration and stiffness at biointerfaces and related cellular processes

The direct and indirect (by changing mechanical properties) effects of hydration at interfaces on cellular processes and tissue diseases are reviewed. The essential effect of substrate stiffness on cellular processes was demonstrated in the last decade. The combined effect of surface stiffness and hydration at interfaces has garnered much less attention, though hydration and dehydration play important roles in biological processes. This review focuses on the studies that demonstrate how hydration affects biological processes at interfaces. Elevated sodium and dehydration stimulate inflammatory signaling in endothelial cells and promote atherosclerosis. Various types of implant and blood contacting device coatings with varied surface stiffness and hydration have been reported. Effect of hydration on polymer modulus of elasticity and viscoelasticity was discussed taking into account cells adhesion, migration, proliferation, differentiation on surfaces with various degree of hydration. Future directions of research were considered, including the use of nanotechnology to regulate the hydration degree.     

基于ArcCHECK模体的VMAT计划验证及摆位误差对剂量验证的影响

目的:探究ArcCHECK模体在旋转容积调强技术（VMAT）计划验证中的应用,并利用软件模拟摆位误差对剂量验证的影响。方法:随机收集45例VMAT计划,分别选取胸部肿瘤、乳腺癌和宫颈癌各15例,将ArcCHECK模体实测的剂量分布与计划系统计算的结果进行对比分析,分别探究在阈值10%下,3%/3 mm和2%/2 mm时,Gamma分析与DTA分析下相对剂量（RD）与绝对剂量（AD）的通过率。利用SUNnuclear公司Sunpatient软件将计划系统计算的剂量分布与实际测量的剂量分布进行对比,并利用软件模拟旋转误差,分别旋转±0.5°、±1°、±1.5°、±2°,将旋转后的剂量分布与计划系统计算剂量分布对比,得到旋转误差下的计划验证通过率;同样利用软件模拟平移误差,分别向X、Y方向平移±1、±2、±3、±5 mm后进行剂量分布对比,得到平移误差下的计划验证通过率。结果:当阈值选择10%、3%/3 mm时,Gamma分析时,RD与AD下各部位的通过率基本达到95%及以上,DTA分析时,RD和AD下各部位的通过率基本达到90%及以上。当阈值选择10%、2%/2 mm时,各部位肿瘤VMAT计划的验证通过率无论在Gamma还是DTA分析时,RD和AD的平均通过率只有80%左右。存在误差时,旋转误差大于等于1°时,各部位肿瘤VMAT计划验证在两种分析方法下通过率的单因素方差分析结果显示P<0.05;X方向和Y方向平移误差大于等于3 mm时,单因素方差分析结果显示P<0.05。结论:ArcCHECK模体能很好地应用于VMAT计划的验证,阈值选择10%、3%/3 mm时,胸部肿瘤、乳腺癌和宫颈癌验证通过率均能达到95%及以上;阈值选择10%、2%/2 mm时通过率均有大幅度下降,仅有80%左右。旋转误差大于等于1°时对计划验证通过率有显著影响,差异具有统计学意义,同样X方向或Y方向平移误差大于等于3 mm时,两种分析方法下的计划验证通过率均有显著差异。     

Anthrax toxin receptor proteins

Anthrax toxin is a key virulence factor for Bacillus anthracis, the causative agent of anthrax. Here we discuss what is known about the anthrax toxin receptor (ATR), the cellular receptor for anthrax toxin, and how this information is being used to develop treatments for anthrax as well as to understand aspects of cancer. ATR was identified recently as a type I transmembrane protein with unknown function that contains an extracellular integrin-like inserted (I) domain. The ATR I domain contains the toxin binding site, and a soluble form of this domain was shown to serve as an effective antitoxin to protect cultured cells from toxin action. ATR is encoded by the tumor endothelial marker 8 (TEM8) gene, which is selectively up-regulated during blood vessel formation and in tumor vasculature, raising the possibility that this protein normally functions in angiogenesis. Therefore, identification of the cellular receptor for anthrax toxin has made possible new avenues of research in the areas of anthrax pathogenesis, antitoxin development, and cancer biology.     

马洛替酯无晶化物的制备

以胶态二氧化硅为载体,采用熔融法制备了马洛替酯无晶化物,经ＤＴＡ热分析与Ｘ ｒａｙ衍射实验证明,马洛替酯以无晶化形式存在于载体．不同粒度的马洛替酯及其无晶化物的溶出度测定结果表明,无晶化物的溶出度明显优于不同粒度的马洛替酯     

Clinical outcomes and rates of aortic growth and reoperation after 1-stage repair of extensive chronic thoracic aortic dissection

Objective

The study objective was to analyze clinical outcomes, distal segmental aortic growth, and aortic reoperation rates after 1-stage open repair of extensive chronic thoracic aortic dissection via bilateral anterior thoracotomy.

不同结晶条件下7-ACA晶型结构与质量稳定性研究

本文利用粉末X射线衍射（XRD）、红外光谱法（FT-IR）、拉曼光谱和差热分析（DTA）,对不同结晶条件下得到的四种7-ACA（7－氨基头抱烷酸）样品的晶型结构进行研究,同时也对上述结晶条件下制备的7-ACA产品进行质量稳定性研究;结果表明7-ACA在不同结晶条件下可获得相同晶型结构,且其质量稳定性没有显著性差异。从而说明7-ACA结晶条件较宽松．不同结晶方式能产生相同晶型结构的产品,且质量稳定性一致。     

Adjuncts for the evaluation of potentially malignant disorders in the oral cavity: Diagnostic test accuracy systematic review and meta-analysis—a report of the American Dental Association

Background

Oral squamous cell carcinoma is the most common manifestation of malignancy in the oral cavity. Adjuncts are available for clinicians to evaluate lesions that seem potentially malignant. In this systematic review, the authors summarized the available evidence on patient-important outcomes, diagnostic test accuracy (DTA), and patients’ values and preferences (PVPs) when using adjuncts for the evaluation of clinically evident lesions in the oral cavity.

2种中药化学对照品的多晶型现象初探

化学药品的晶型研究十分广泛,但中药中活性化学成分的多晶型现象尚未引起足够重视。该文以无水的脱水穿心莲内酯和含水的升麻素苷为代表,采用显微、熔点、差热分析和红外光谱技术探讨了不同晶型中药化学对照品的差异。结果表明晶型不同会引起熔点、热行为和红外光谱的改变。提示在应用中药化学对照品时如得到不同的指标测定结果,须考虑多晶型的存在。不同晶型的中药活性成分的化学性质差异尚待深入研究。