9443对LA—795肺腺癌的放射增敏作用

为观察含锗药物９４４３的放射增敏作用，以小鼠实体肿瘤ＬＡ－７９５肺腺癌研究９４４３的放射增敏效果。采用肿瘤生长延缓法评价，测得平均放射增敏比为１．２，药物ＬＤ５０毒性为５００ｍｇ／ｋｇ体重。     

多功能纳米材料在肿瘤放疗增敏中的应用

放射治疗是利用放射线治疗肿瘤的一种局部治疗方法,目前已成为临床上最常用、最有效的恶性肿瘤治疗手段之一。但放射治疗仍存在辐射剂量高、对健康组织副作用大,特别是肿瘤细胞放射抵抗性强等缺点。随着纳米医学的发展,多功能纳米放疗增敏剂为增强肿瘤细胞放射敏感性、提高放疗效果提供了新机遇。本文结合纳米材料在放疗增敏中的优势和潜能,概括了纳米放疗增敏剂的主要类型和目前已进入临床实验的一些实例,简述了多功能纳米放疗增敏剂在肿瘤放射治疗中的应用,并归纳了纳米材料增敏放疗的主要途径和影响因素。最后总结和展望了多功能纳米放疗增敏剂面临的挑战和发展前景。     

硝基三唑化合物的电化学还原机理

1　引　　言硝基三唑类化合物 (ＮＴＲ)是一种新型的放射增敏剂 ,在体内外均能特异的增强乏氧细胞对射线的敏感。此类化合物的增敏作用与硝基的氧化还原有关。因此 ,研究这类化合物的氧化还原机理有助于阐明其体内过程。本文应用直流极谱、循环伏安和库仑分析等方法研究了 4种具有放射增敏效果的ＮＴＲ1 、ＮＴＲ2 、ＮＴＲ3、ＮＴＲ4 (Ｘ、Ｙ分别为Ｈ ,ＣＨ2 ＣＯＯＣＨ2 ＣＨ3;ＣＨ3,ＣＨ2 ＣＯＯＣＨ2 ＣＨ3;Ｈ ,ＣＨ2 ＣＯＮＣＨ2 (ＣＨ2 ) 3ＣＨ2 ;ＣＨ3,ＣＨ2 ＣＯＮＣＨ2 (ＣＨ2 ) 3ＣＨ2 )的电化学还原机理 ,并观察到质子化的硝基自…     

铜离子对稀土（Ⅲ）～DBF－偶氮氯膦体系极谱吸附波的增敏作用研究

铜离子对稀土（Ⅲ）～ＤＢＦ－偶氮氯膦体系极谱吸附波的增敏作用研究晏蓉，施文赵（华中理工大学煤燃烧国家重点实验室、化学系，武汉，４３００７４）关键词稀土（Ⅲ），铜（Ⅱ），ＤＢＦ－偶氮氯膦，极谱吸附波，增敏ＤＢＦ－偶氮氯膦（ＤＢＦ－ＣＰＡ）是一种新的稀土...     

银—铜—铁—镍体系测定条件的旋转设计优化和目标转换因子分析？…

利用二次通用旋转组合设计的方法，建立了吸光度与显色剂、增敏剂用量以及ｐＨ值之间的数学模型，进而得到使吸光度最大的显色剂用量、增敏剂用量及ｐＨ值。在此优化的基础上，用目标转换因子分析分光光度法对银、铜、铁、镍的合成样品的合谱进行了解析处理，得到较为满意的结果。     

β-(N-芳基酰胺基)乙基锗倍半氧化物的合成

1970年左右,日本学者合成了β-羧基乙基锗倍半氧化物(Ⅰ)[简式为(GeCH_3CH,COOH)_3O_3],生物及临床实验结果表明该化合物具有抗癌等广泛的生物活性,而且毒性极低,最近,我们又发现化合物(Ⅰ)是一种具有双重性能的放射增敏剂,即一方面它对肿瘤细胞具有放射增敏作用,另一方面又对红细胞有辐射保护作用,这些     

银—铜—铁—镍体系测定条件的实验设计优化和卡尔曼滤波法的同时测定

利用二次通过旋转组合设计的方法建立了吸光度与显色剂，增敏剂用量以及ｐＨ值之间的数学模型，进而得到使吸光度量最大的显色剂用量，增敏剂用量及ｐＨ值，在此优化的基础上，用卡尔曼滤波分析分光光度法对银，铜，铁，镍的合成样品的合谱进行了解析处理，得到较为满意的结果。     

三苯甲烷染料电子云的对称性与显色反应增敏的研究

用吸收光谱、红外光谱、量子化学、溶液状态等方法探讨了三苯甲烷染料的显色反应,发现有机试剂电子云的对称性与显色增敏有直接关系,表面活性剂的引入,使显色剂的电子云分布更趋均匀,增敏效果显著.应用这种推论可圆满地解释表面活性剂的增敏现象.     

铋(Ⅲ)-8-羟基喹哪啶体系的极谱行为——表面活性剂增敏机理和分析应用——Ⅲ.十二烷基苯磺酸钠对铋(Ⅲ)-、铅(Ⅱ)-8-羟基喹哪啶,铜(Ⅱ)-、镉(Ⅱ)-、锌(Ⅱ)-乙二胺体系电流增敏机理对比和规律

研究并比较了十二烷基苯磺酸钠(SDBS)对Bi(Ⅱ)-、Pb(Ⅰ)-8-羟基喹哪啶,Cu(Ⅰ)-、Cd(Ⅰ)-、Zn(Ⅰ)-乙二胺体系示波极谱电流的增敏效果,和对峰电位的影响及有关试验。表明SDBS只对能形成螯合阳离子者起增敏作用,其增敏程度则受SDBS在电极表面与相应螯合阳离子是形式缔合物,还是因超载静电吸引产生诱导吸附作用所制约。前者最佳可增敏达60余倍,后者最佳可增敏10余倍。     

银-铜-铁-镍体系测定条件的旋转设计优化和目标转换因子分析法的同时测定

利用二次通用旋转组合设计的方法 ,建立了吸光度与显色剂、增敏剂用量以及p H值之间的数学模型 ,进而得到使吸光度最大的显色剂用量、增敏剂用量及 p H值。在此优化的基础上 ,用目标转换因子分析分光光度法对银、铜、铁、镍的合成样品的合谱进行了解析处理 ,得到较为满意的结果。     

Titrations in non-aqueous media: Potentiometric method for determination of industrially important chloroanilines with perchloric acid in nitrobenzene solvent

A new potentiometric method to titrate some industrially important chloroanilines in nitrobenzene solvent with perchloric acid is described. The method was compared statistically with the classical diazotization method and shown to be significantly more accurate for two of the four compounds tested, with similar precision (RSD 0.4–0.8%). This comparison has revealed that the new method has some definite advantages over the classical diazotization method. The potentiometric method is also more rapid.     

Solubility of low-molecular-mass compounds in copolymers

The solubility of some low-molecular-mass antioxidants in polyethylene-based copolymers was studied. It is shown that another copolymer has a complex effect on the solubility of low-molecular-mass compounds and the concentration of their saturated vapor over the copolymers.     

Simplex-optimization with a new criterion. Applications to dual-column ion chromatography

A new optimization criterion for chromatography is presented. It was designed to evaluate the quality of chromatograms in a way similar to human estimation. Selectivity, efficiency, and time of analysis as well as the number of peaks were taken into account. The criterion has been tested in comparison with expert estimations and some modern criteria. A better agreement of the new criterion with human estimation of chromatographic quality compared to some literature criteria is shown. A number of successful optimization runs has been performed using the criterion together with simplex optimization.     

Fluorine insertion reactions into pre-formed metal oxides

Fluorine insertion reactions have been shown to be capable of modifying the physical properties of metal oxide materials, as a result of the structural and electronic consequences of fluorine insertion. This has been applied to copper oxide systems and has led to an enhanced understanding of the requirements for superconductivity, and more recently to other magnetic metal oxide systems where it has been shown to tune the magnetic properties of these materials. This review focuses on some important aspects of research on low temperature fluorine insertion reactions into pre-formed metal oxides, since 1998, and reports some new results.     

Hydrogen/deuterium exchange in gas phase reactions of anions with some alkyl phenyl ethers

The gas phase reactions of anions with methyl and ethyl phenyl ether have been studied by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry. ¹⁸O-Labelling has shown that part of the reactions of OH^- with methyl phenyl ether proceed via ipso-substitution, the main reaction channel being S_N2 substitution. Deuterium labelling has shown that extensive inter- and intramolecular hydrogen/deuterium exchange can precede the final substitution reaction. Hydrogen atoms originating from the methoxy substituent are involved in this exchange process. The reactions of anions with ethyl phenyl ether proceed mainly via an elimination mechanism. Deuterium labelling has shown that in some cases hydrogen/deuterium exchange takes place prior to elimination.     

A New Version of Multicomponent Synthesis of 4,6-Diaryl-2-sulfanylidene-1,2-dihydropyridine-3-carbonitrile Derivatives

Multicomponent condensation of aromatic aldehydes with acetophenones, cyanothioacetamide, and alkylating agents has been shown to provide synthetic routes to various pyridine and thienopyridine derivatives. The structure of some of the synthesized heterocycles has been confirmed by X-ray analysis.     

几种血卟啉3,8-烷氧(硫)基衍生物产生单重态氧能力的研究

在“血卟啉衍生物”(HPD)^[1]肿瘤光动力疗法取得令人瞩目成就的同时,化学家们证明了临床使用的HPD制剂并非原意义上的血卟啉衍生物,而是一种复杂的卟啉混合物^[2],其中血卟啉(HP),羟乙基-乙烯基-次卟啉(HVD),原卟啉(PP)约占总量的80%,Dougherty等分离得到其余20%未知结构羧基卟啉,认为此为HPD的有效成分,经进一步分析测定其主要成分是二血卟啉醚(DHE)^[3]。     

The reaction of 3- and 4-aminopyridines with isocyanates and isothiocyanates

The reaction of 3-and 4-aminopyridines with some isocyanates and isothiocyanates has been studied, and it has been shown that in the majority of cases aryl isothiocyanates form symmetrical diaryl- and dipyridylthioureas. The hypothesis has been put forward on the possible occurrence of the reaction of the isothiocyanates with 3- and 4-aminopyridines.