磁场对胆石中胆固醇溶解作用的影响

研究了旋转磁场、静磁场、脉冲磁场对胆石中胆固醇溶解作用的影响。对样品中胆固醇的含量进行了定量分析，测定了溶出百分数。结果表明，上述磁场对胆石中胆固醇的溶解均有不同程序的促进作用。     

溶解气驱过程中的分形生长模型

临界气体饱和度是溶解气驱过程的重要参数，尖不同的领域内它的定义不同，因此，不加说明易产生混淆。应用气体气泡的生长过程确定了临界气体饱和度，从宏观和微观的结合上来理解溶解气驱的机理。建立了分形生长过程的偏微分方程模型（ＰＤＥ），并给出相应的定解条件，将分形生长过程问题归结为具有移动边界的自由边界值问题。在一定的条件下，这个方程的自由边界值问题可应用拟静态近似分解为一系列稳定问题来求解。在渗滤网络上应     

福建九龙江河口游离氨基酸的分布规律初探

通过在九龙江河口及厦门西海域的多次航行取样，并对其ＤＦＡＡ含量、ｃｈｌ－ａ含量以及盐度等多种水文因素进行分析．从而得出游离氨基酸含量与海水的物理因素（如混合程度）、盐度、浮游植物生物量等之间的相互关系．而海水中游离氨基酸ＤＦＡＡ含量是引起赤潮的一个主要原因．因此，弄清ＤＦＡＡ含量变化规律．也是预防赤潮发生的重要前提．它对赤潮的预测及防护以及治理都关系甚密．     

无机盐类溶解性的热力学讨论

讨论了无机盐溶解过程中△H~e和△S~e 各自对溶解性的影响,以及它们组合成△G~e的四种情况,提出了以△G~e近似估计无机盐溶解性的计算公式。     

用DMSO/水复合溶剂制备PVA凝胶纺原液及其流变性能的研究

本工作以聚合度DP=1750的市售聚乙烯醇(PVA)为原料,以乙二醇(EG)及各混合比例的DMSO/水的混合物为溶剂,借助于扫描电子显微镜(SEM)和差热扫描量热法(DSC)等手段,对溶解过程作了研究。研究表明:当DMSO/水的比例为70/30时,该混合溶剂的溶解性能最好。通过对PVA—DMSO/水体系的流变研究发现,在80～100℃之间,浓度为14～17.4％时,该溶液具有很好的流变性能。     

Expression and proteolytic activity of calpain in lens epithelial cells of oxidative cataract

Objective: To study the role of calpain in the mechanism of oxidative cataract through detecting the level of intracellular free Ca^2 , the expression and proteolytic activity of calpain in the lens epithelial cells (LECs) of H2O2-induced cataract. Methods:Rat lenses were cultured in vitro and cataract was induced by H2O2. The level of intracellular free Ca^2 was measured by fluorescence determination with fura-2/AM. The expression of m-calpain protein in LECs was detected with immunohistochemical method. The proteolytic activity in LECs was measured using a fluorogenic synthetic substrate.Results: There were significant differences of the level of intracellular free Ca^2 (P=0.001, 0.000, 0.000), the expression of m-calpain (P=0.001, 0.000, 0.000) and the proteolytic activity ofcalpain (P=O.O01,0.000, 0.000) between H2O2-induced and control group at 6, 12 and 24 h, respectively. Conclusions: H2O2 can increase intracellular free Ca^2 , then enhance the expression and proteolytic activity of calpain which may play a role in the mechanism of oxidative cataract of rat.     

Relationship between toxicity and molecular volume of dioxins,organic phosphorous compounds and <Emphasis Type="Italic">n</Emphasis>-alkanols

The molecular volumes of dioxins, organic phosphorous compounds and n-alkanols were computed at the B3LYP/6-311G** level, and were then correlated with their toxicity. It was surprisingly found that there exists the so-called “critical volume of toxicity“ (CVT) in each series of compound of the present study, i.e. the toxicity increases with increase of the molecular volume when less than CVT, while decreasing with increase of the molecular volume when larger than CVT. The CVT for the three series of compounds is quite similar, ranging 0.309----0.320 nm^3. It was proposed that the ordinary linear solvation energy relationship (LSER) should be modified with respect to the new findings, and accordingly the anaesthetic potency of partial fluorinated n-alkanols was predicted.     

难熔金属梯度合金的进展

文中概述了双相结构梯度硬质合金(DP合金)的性能与结构特点以及研究现状;介绍了脱β层梯度合金形成的过程机理以及β相溶解模型;阐明了金属熔体渗透制备梯度合金的方法;介绍了硬质合金和金属陶瓷组合梯度材料强化机理和材料设计的理论基础,并介绍了近十年国内外难熔金属梯度材料的发展状况.     

Geological records of marine environmental changes in the southern Okinawa Trough

Indexes of sediment grain size,sedimentation rates,geochemical composition,heavy,minerals,benthic foraminiferal fauna,indicator species of the Kuroshio Current,paleo-SST and carbonate dissolution of core E017 conformably suggest a great marine environmental change occurring at about 10.1-9.2cal.kaBP in the southern Okinawa Trough,which may correspond to the strengthening of the Kuroshio Warm Current and re-entering the Okinawa Trough through the sea area off northeast Taiwan.The invasion of Kuroshio current has experienced a process of gradual strengthening and then weakening,and its intensity became more fluctuation during the last 5000 years.Compared to the transition of sediment grain size,geochemical composition and heavy minerals,the foraminiferal faunas show a 900-year lag,which may indicate that the invasion of Kuroshio Current and the consequent sea surface and deep-water environmental chanages is a gradual process,and fauna has an obvious lag compared to environment altering.The carbonate dissolution of the Okinawa Trough has had an apparent strengthening since 9.2cal.kaBP,and reached a maximum in the late 3000 years,which may be caued by the deep-water environmental changes due to the invasion of Kuroshio Current.     

2MgO·2B_2O_3·MgCl_2·14H_2O溶解及相转化的动力学机制研究

研究了温度、搅拌速度对２ＭｇＯ·２Ｂ２Ｏ３·ＭｇＣｌ２·１４Ｈ２Ｏ在水中溶解及相转化动力学的影响。给出了溶解和转化结晶动力学方程;根据Ａｒｒｈｅｎｉｕｓ公式,估算了溶解和结晶反应的活化能。依据反应级数、活化能及搅拌效应,确定了该复盐的溶解和转化结晶反应动力学机制。