硒的抗突变性作用与机体免疫功能的研究

研究了在三氯甲烷致突变性试验中加入硒的影响。结果显示硒能减少Ａｍｅｓ试验中三氯甲烷诱变的回变菌落数，能使小鼠骨髓嗜多染红细胞微核率和鳙鱼外周血有核红细胞微核率明显下降。并研究了硒在细胞免疫试验中的作用，结果显示硒能使正常鼠和荷瘤鼠的肺和脾的ＮＫ细胞活性提高，能促进其脾Ｔ淋巴细胞的增殖反应，还能增加外周血Ｔ淋巴细胞数。     

硒与消化系统癌关系的探讨

据不同地貌、地质条件在30个县市按剖面、同步、随机取土壤样品372份．测定硒等微量元素含量．作等级相关分析显示。土壤硒含量与消化系统癌呈负相关关系．作相对危险度、剂量-效应及多因素分析,认为此负相关关系并非偶然现象．     

Oxidation of the Norditerpenoid Alkaloids Isotalatisidine and 6-Epiforsticine

Inpreviousworksonmodificationsofnorditerpenoidalkaloids,wereportedsomeimportantreactionssuchasN-deethylationandpreparationsoftheimmesand7,17-secoderivatives'.NowwewishtorepoFtoxidationofthenorditerpenoidalkaloidsisotalatizidineand6-epiforsticine.Oxidationofnorditerpenoidalkalnidshavinganla-hydroxylgroupwithreagentssuchasKMnO.K,Fe(CN),,OsO.,Ag,OandNBSaffordedcompoundswithanO,Nmixedacetalsystems=.Thus,treatmentofisqtalatizidineIwithKMnO.inacetone-H,O(5;1)forIhgavetheknowncompoundnevade…     

健康老年人与若干常量及微量元素的相关性研究

用原子吸收光谱法测定了７０例健康老年人、３０例健康成年人和３０例老年高血压病人血清中Ｃｕ、Ｚｎ、Ｆｅ、Ｍｎ、Ｃａ、Ｍｇ６种元素的含量．结果表明，健康老年人组与健康成年人组（对照组）相比，除Ｆｅ以外，Ｃｕ、Ｚｎ、Ｍｎ、Ｃａ、Ｍｇ均有显著性差异；与老年高血压病人组相比，除Ｍｇ以外，Ｃｕ、Ｚｎ、Ｆｅ、Ｍｎ、Ｃａ均有显著性差异．我们认为稳定的Ｃｕ／Ｚｎ比值及较高的血Ｍｇ水平是健康老年人未发生心血管疾病及糖尿病的重要原因之一，而高Ｃｕ、高Ｃａ及显著偏高的Ｃｕ／Ｚｎ比值，则是发生高血压的一个重要原因。     

分娩时母血脐血铜、锌微量元素变化的研究

测定了健康正常分娩的产妇49例的母血，脐带血和正常未孕妇女50例的血清铜，锌含量，结果表明，分娩期母血清中铜，锌，铜/锌比值低于未际妇女，有显著差别，铜未见差别，母血清中铜与铜/锌比值均高于脐血清中值，有显著差别，母血清中锌明显低于及早血清中值并有显著差别，分娩期血清中铜，锌值与胎儿体重关系无显著差异；胎膜早破与非胎膜早破无妊娠合并症者血清中铜，锌未发现差别，提示妊娠母亲血清中微量元素锌，铜与胎儿的生长发育有关。     

中药微量元素含量区间尺最佳分级问题的探讨

在深入研究中药微量元素含量区间尺的基础上，从统计学角度对区间尺的最佳分级问题作了详细探讨，提出用5级区间尺来衡量中药中不同元素含量间相对高低水平，理论上更合理。     

库仑滴定法测定有机硅样品中的氮含量

本文利用库仑滴定法研究了高分子和低分子硅氮化合物及含氮有机硅样品中氮含量的测定,并研究和讨论了影响测定结果准确性的因素。     

The role of the He I and He II metastables in the population of the Sn II,Sn III and Sn IV ion levels

On the basis of the temporal evolutions of the singly, doubly and triply ionized tin (Sn II, Sn III and Sn IV, respectively) spectral line intensities, in the pulsed helium and nitrogen plasmas, the important role of the He I and He II metastables has been observed in the Sn II, Sn III and Sn IV ionization and population processes. According to these processes, one can expect realization of several laser levels in the Sn II (11.07, 11.20, 12.44 and 13.11 eV), Sn III (15.91, 17.82, 19.13 and 20.19 eV) and Sn IV (20.51 eV) spectra. The modified version of the linear, low-pressure, pulsed arc was used as a plasma source operated in helium with tin atoms, as impurities, evaporated from tin cylindrical plates located in the homogenous part of the discharge tube. This plasma source provides good conditions for a generation of the Sn III, Sn IV and Sn V ions at relatively low electron temperatures (below 18,000 K) providing low background radiation around the intense Sn IV and Sn III spectral lines in the helium plasma. The 222.613 ± 0.0005 nm Sn IV line, not observed up to now, has been identified. The marked, but not classified 243.688 nm Sn spectral line is sorted by ionization stages. The shapes of Sn III and Sn IV lines, ranged between 207 nm and 307 nm, have been obtained. At a 17,500 K electron temperature and 1.07 × 10²³ m^− 3 electron density the Stark broadening was found as the dominant mechanism in the mentioned lines broadening. The measured Stark widths of the prominent nine Sn IV and seven Sn III lines are the first data in the literature. The Stark widths of the intense 229.913 nm and 288.766 nm Sn IV lines can be used for the plasma electron density and temperature diagnostics purposes.     

硒对氟中毒大鼠尿氟及脑肾组织脂质过氧化物含量的影响

大鼠饲料分别加入２×１０－６、４×１０－６硒．饮用７．５×１０－６、１５×１０－６氟水．１个月后，随尿硒粪硒排量增加，尿氟排量也增高，以２×１０－６硒饲料排氟效果最佳．血浆中ＡＬＰ、ＧＯＴ、ＧＰＴ及ＬＤＨ等酶活性加硒组有不同程度的降低．随后两次增高氟水量重复试验，给以２×１０－６硒饲料，仍观察到尿氟排量增高．血中含硒酶谷胱甘肽过氧化物酶活性也有升高趋势，脑及肾中脂质过氧化物（ＬＰＯ）含量明显减少，病区患者服硒后，尿氟含量亦高于对照组．实验结果提示；１）硒能促使体内氟由尿中排出；２）降低某些组织ＬＰＯ含量；３）减少体内氟含量；４）预防和改善氟中毒某些临床症状。     

Calamistrin E, the First Annonaceous Acetogenin with Double Bond in Aliphatic Chain from Genus Uvaria

Annonaceous acetogenins are considered as the main components with cytotoxicity inthe plants of Annonaceae family. The genus Uvaria is one of the main plants containingAnnonaceous acetogenins, and more than fifty acetogenins have been isolated from eightspecies of the title genus"', however, acetogenins with double bond in the aliphatic chainhas not yet been reported. In this paper we report the structure elucidation of calamistrinE (l), a new acetogenin bearing one double bond besides a tetr…     

牡蛎外套膜中微量元素含量的测定

采用原子吸收分光光度法对广东沿海五个养殖场的牡蛎外套膜和内脏团中微量元素含量进行测定，并对其测定结果作初步探讨．发现测定牡蛎外套膜中微量元素的含量也能反映环境污染的情况及生物体内的富集情况．     

对微量元素与恶性肿瘤关系的新认识

微量元素与恶性肿瘤关系是当前十分引人注目的研究课题．MEDLINE数据库显示．近5年中硒、锌、铜与肿瘤关系的文章最多．微量元素与恶性肿瘤相关性有三种可能,即微量元素的丰缺是恶性肿瘤的结果.是肿瘤发生的条件因素或病因．微量元素之间的关系相当复杂．既拮抗。又协同，微量元素的研究刚起步．取样和检测方法等均需标准化．其与恶性肿瘤的发生和发展的机理更需积极研究.     

Stable cubic spinels in the Zn-Mn-O system in air

A part of the Zn-Mn-O phase diagram has been studied by using soft synthetic conditions and highly reactive precursors. This procedure allowed us to find and to isolate new single phases in the Zn-rich region. The new compounds are cubic spinels with a nominal composition Mn_3−xZn_xO₄ with x=1.6 and 1.7. These spinels decompose upon heating giving rise to tetragonal distorted spinels. This survey is focused on the low-temperature region (T?700 °C) completing previous reports on the Zn-Mn-O phase diagram.We also report the magnetic properties of the new cubic spinels. These samples behave as paramagnets obeying a Curie-Weiss law in a broad temperature range. The effective paramagnetic moment agrees with the nominal mixture of Mn³⁺ and Mn⁴⁺ ions. However, randomness and competitive interactions give rise to the formation of spin-glass phases at very low temperature.     

Non-aqueous quantitative determination of the carbonyl functional group by constant-current potentiometric titration

A non-aqueous direct titration procedure has been developed for the determination of aldehydes and ketones. It uses two platinum-wire indicating electrodes with a constant current of 0.5 muA. The solvent medium is 0.15M sodium perchlorate in tetrahydrofuran. The titrant is sodium fluorenyl in a mixture of 1,2-dimethoxyethane and tetrahydrofuran. All types of carbonyl compounds react with the sodium fluorenyl, but steric hindrance prevents complete reaction with certain ketones containing bulky groups. The lowest concentration of carbonyl that can be determined with acceptable accuracy and precision is 7.5 x 10(-3)M, the error being < 3% and the precision better than +/-2.5%. Most reducible compounds interfere, e.g., peroxides, acid halides, nitro-compounds, acids, and water, and cannot be differentiated potentiometrically. The method can be extended to other reducible functional groups, e.g., nitro groups and acid chlorides.     

On the Stark broadening in the Au I and Au II spectra from a helium plasma

The Stark FWHM (Full-Width at Half of the Maximal line intensity, W) of 5 neutral and 26 singly ionized gold (Au I and Au II, respectively) spectral lines have been measured in laboratory helium plasma at approximately 16,600 K electron temperature and 7.4 × 10²² m^− 3 electron density. Five Au I and ten Au II W values are reported for the first time. The Au II W values are compared with recent theoretical data, calculated based on a modified semi-empirical approach, and also with existing experimental W values. Our normalized Stark widths are six times higher than those measured in a laser-produced plasma. Possible explanation of this is recommended here. An agreement (within the accuracy of the experiment and uncertainties of the theoretical approach used) with the recently calculated W data was found in the 6p–7s Au II transition. The calculated hyperfine splitting for the five Au II lines in the 6s–6p transition is also presented. At the stated helium plasma conditions, Stark broadening has been found to be the dominant mechanism in the Au I and Au II line shape formation. A modified version of the linear low-pressure pulsed arc was used as a plasma source operated in helium, with gold atoms as impurities evaporated from the thin gold cylindrical plates located in the homogeneous part of the discharge, providing conditions free of self-absorption. This plasma source ensures good conditions for generation of excited gold ions due to Penning and charge exchange effects.     

急性脑血管病患者血清元素的测定

采用高频等离子体发射光谱法测定了３４例脑梗塞、３３例脑出血和对照组２７人血清锌、铜、锰、铬、镁、钼、锶、铁、钛、钡、镉和钙共１２种元素的含量。结果显示脑梗塞和脑出血组血清锌和锌／铜比值显著高于对照组；锰和钼含量仅在脑梗塞组明显增高，锶仅在脑出血组显著增高，而其它几种元素疾病组与对照组无显著性差异。伴有高血糖、高血脂和高血压的病人，其血铬含量显著降低，表明锌、锌／铜比值、锰、钼、锶、铬元素与急性脑血     

多波长线性回归法用于同时光度测定铁和铜

在弱酸性介质中,在乳化剂OP存在下,铁、铜与PAN形成最大吸收均在550nm处的水溶性有色络合物,两者相互严重干扰。本文采用多波长回归分析法对此混合显色体系进行研究,选择在570～590nm区间,测定11个波长处的吸光度,使用简易程序计算器,进行数据回归处理,可简便快速地直接求出铁、铜的含量。应用于铝合金中铁、铜的同时测定,结果满意。     

The electronic structure of heteroaromatic molecules; non-empirical calculations and photoelectron spectra for the isomeric-thiazoles and -thiadiazoles

The He(I) and MgKα photoelectron spectra are reported for the isomeric thiazoles, and He(I) spectra for the isomeric-thiadiazoles. Marked fine structure is apparent on some of the spectra. Comparison with the earlier spectra for thiophen and the azoles, and with ab initio calculations for the seven compounds, has led to assignment of the spectra. The calculations suggest that 1,3,4-thiadiazole is less aromatic than the other title compounds. As expected, the role of the 3d_s orbitals is found to be that of polarisation functions for all of the compounds, but inclusion of these orbitals leads to much better agreement with the observed dipole moments, both in magnitude and direction.     

Early petroleum chemists and the beginnings of chromatography

Summary The activities of D. T. Day (1859–1915, J. E. Gilpin (1866–1924) and C. Engler (1842–1925) connected with the adsorptive filtration of petroleum oil samples are discussed. As indicated, their methodology can be considered as precursor of the chromatographic technique; however, it should not be envisaged as the beginnings of chromatography.