Bernstein型多项式的高阶渐近表达

研究Bernstein型多项式的高阶渐近问题 ,得到一个新的高阶渐近等式     

新取代苯并冠醚的合成

以聚磷酸为催化剂和反应溶剂，合成了卤代乙酰型取代苯并冠醚Ａ、Ｂ、Ｃ和乙酰型取代冠醚Ｄ，四种合成产物由ＩＲ，ＭＳ和元素分析鉴定了结构。     

血液低密度脂蛋白和纤维蛋白原的选择净化

以新型类肝素聚阴离子磺化羟丙基壳聚糖（ＨＰＣＳＳ）为净化剂，研究其选择净化血液低密度脂蛋白（ＬＤＬ）及纤维蛋白原（Ｆｉｂ）的性能，分别考察了净化剂用量和净化体系ｐＨ值对净化效果的影响，确立了较好的净化条件。结果表明，在ｐＨ＝４．７７￣４．７２，净化剂初始浓度４０００ｍｇ／Ｌ时，磺化羟丙基壳聚糖具有良好的选择净化性能，是一种新型ＬＤＬ／Ｆｉｂ净化剂。可使血浆总胆固醇下降４５％￣６６％，低密度脂蛋白和     

卤代蔗糖类甜味剂

论述了卤代蔗糖甜味剂的应用和研究发展进程 ;分析了卤代蔗糖的结构与甜度的关系 ,并探讨了它们的合成方法     

卟啉类光敏剂的制备及其研究(Ⅴ)──血卟啉及其衍生物的激光荧光光谱及单态氧的测定

卟啉、氧和光是光化治癌的三个基本要素。本文测定了血卟啉及其衍生物的荧光 光谱及单态氧的相对量子产额。结果表明，血卟啉的荧光强度和单态氧的量子产 额较高，它们均为有效的光敏剂。     

新型苯基醚类苯并呋喃衍生物的合成

以水杨醛与2-溴-4’-氟苯乙酮为原料,合成2-(4-氟苯甲酰基)苯并呋喃,进一步与酚反应,合成得到6个新的苯基醚类苯并呋喃衍生物(2a~2f),其结构经IR、1H NMR和13C NMR进行了表征.     

Intervening on time derivatives

Interventionism analyses causal influence in terms of correlations of changes under a distribution of interventions. But the correspondence between correlated changes and causal influence is not obvious. I probe its plausibility with a problem-case involving variables related as time derivative (velocity) to integral (position), such that the latter variable must change given an intervention on the former unless dependencies are introduced among the testing and controlling interventions. Under the orthodox criteria such interventions will fail to be appropriate for causal analysis. I consider various alternatives, including permitting control interventions to be chancy, restricting the available models and mitigating variation of off-path variables. None of these work. I then present a fourth suggestion which modifies the interventionist criteria in order to permit interventions which can influence other variables than just their own targets. The correspondence between correlated changes and causal influence can thereby saved when dependencies are introduced among such interventions. This modification and the required dependencies, I argue, are perfectly in line with practice and may also assist in a wider class of cases.     

丹皮酚及其衍生物的性质研究

从有机胂的角度出发,结合丹皮酚的抗炎、活血和抗肿瘤等特性,合成了一系列的有关丹皮酚和有机胂的衍生物,均为创新化合物;采用正交实验和方差分析对合成化合物的条件进行了探讨,同时对丹皮酚的提取条件进行了优化研究;以创新化合物对人肝癌细胞株HepG2细胞的抗肿瘤活性进行了筛选,获得效果较佳的化合物和最佳的试验浓度,通过对HepG2细胞生长抑制实验、诱导HepG2细胞凋亡分析及机制等的探讨,探索了一类结构简单、较低浓度下可以诱导体外及体内肿瘤细胞凋亡,而对正常细胞影响较小的新型有机胂药物.     

二阶微分方程亚纯解的三阶导函数的不动点

研究了以亚纯函数为系数的二阶线性微分方程解的三阶导函数的不动点问题,得到了与其解的一阶、二阶导函数类似的结果．     

Inhibitory Kinetics of p-Substituted Benzaldehydes on Polyphenol Oxidase from the Fifth Instar of Pieris Rapae L.

Polyphenol oxidase (PPO) is the enzyme responsible for enzymatic browning during the growth of insects. It is also involved in defense reactions and is related with immunities in insects. PPO, a metalloenzyme oxidase, catalyzes the oxidation of ο-diphenol to ο-quinone. The present paper de- scribes the effects of benzaldehyde and its p-substituted derivatives on the activity of PPO from the fifth instar of Pieris rapae L. PPO from the fifth instar of Pieris rapae L. was purified using ammonium sulfate fractionation and chromatography on Sephadex G-100. The enzyme kinetics was characterized using L-3,4-dihydroxyphenylalanine (L-DOPA) as substrate. The results show that benzaldehyde, p- hydroxybenzaldehyde, p-chlorobenzaldehyde, and p-cyanobenzaldehyde can inhibit the PPO activity for the oxidation of L-DOPA. The inhibitor concentration leading to 50% activity lost, IC50, was esti- mated to be 5.90, 5.62, 2.83, and 2.91 mmol/L for the four tested inhibitors, respectively. Kinetic analy- ses show that the inhibitory effects of these compounds are reversible. Benzaldehyde, p- hydroxybenzaldehyde, and p-chlorobenzaldehyde are noncompetitive inhibitors while p-cyano- benzaldehyde is a mixed-type inhibitor. The inhibition constants were determined for all four inhibitors. p-chlorobenzaldehyde and p-cyanobenzaldehyde were more potent inhibitors than the other com- pounds. These results provide a basis for developing PPO inhibition-based pesticides.