菊花微量及宏量元素分析

用ＩＣＰ－ＡＥＳ法测定了药用野菊花和抗白菊及６种人工栽培菊花中Ａｓ，Ｂ、Ｂａ、Ｃａ、Ｃｄ、Ｃｏ、Ｃｕ、Ｆｅ、Ｍｇ、Ｍｎ、Ｍｏ、Ｎｉ、Ｐｂ、Ｓｅ、Ｓｉ、Ｖ、Ｚｎ、Ｐ、Ｓ、Ｋ等元素的含量。结果表明：（１）菊花中Ｃａ、Ｍｇ、Ｐ、Ｓ、Ｋ含量很高，Ｂ、Ｆｅ、Ｍｎ、Ｚｎ也有较高的含量；（２）野菊花中Ｂ、Ｃａ、Ｆｅ、Ｍｇ含量较其他品种高、，抗白菊中Ｍｎ、Ｓｅ、Ｓ含量高地其他品种；（３）代栽培的菊花Ｋ、Ｐ含量高于     

不同产地高良姜无机元素含量的比较

用等离子体发射光谱法测定了三个不同产地高良姜的元素含量，在２７种被测元素中，除Ａｓ、Ｂｅ、Ｃｒ、Ｍｏ、Ｐｂ、Ｓｂ、Ｔｌ７种元素未被检出外，三个产地的高良姜均含有Ａｇ、Ａｌ、Ｂ、Ｂａ、Ｃａ、Ｃｄ、Ｃｏ、Ｃｕ、Ｆｅ、Ｍｇ、Ｍｎ、Ｎａ、Ｎｉ、Ｓｅ、Ｓｉ、Ｖ、Ｚｎ、Ｋ、Ｐ、Ｓ２０种元素，湛江产的高良姜大多数元素的含量要高于其它两地。Ｚｎ和Ｍｎ两种人体必需微量元素的含量较丰富。     

电感耦合等离子体原子发射光谱测定镁—钕合金中稀土和非稀土元素

本文研究了ＩＣＰ－ＡＥＳ测定Ｍｇ－Ｎｄ合金样品中１０种元素的分析方法。选择了同时测定合金中Ｌａ、Ｃｅ、Ｐｒ、Ｓｍ、Ｆｅ、Ａｌ、Ｍｏ、Ｎｉ、Ｃｕ和高含量Ｎｄ（２０％）的条件。得到了满意结果。     

电感耦合等离子体光谱和质谱法分析贻贝标准物质

采用电感耦合等离子体光谱和质谱法分析了贻贝标准物质,光谱法测定Ｋ、Ｎａ、Ｃａ、Ｍｇ、Ｐ、Ａｌ、Ｆｅ、Ｚｎ、Ｍｎ和Ｓｒ,质谱法测定Ａｓ、Ｂ、Ｃｄ、Ｃｏ、Ｃｒ、ＣｕＧａ、Ｇｅ、Ｍｎ、Ｍｏ、Ｎｉ、Ｐｂ、Ｓｅ、Ｓｒ、Ｕ和Ｖ。在优化的工作条件下,测定了来自基体元素Ｋ、Ｎａ、Ｃａ、Ｐ、Ｃｌ的Ｃ的多原子离子＾３９Ｋ＾１６Ｏ、＾３９Ｋ２、＾４０Ａｒ＾２３Ｎａ、＾４３Ｃａ＾１６Ｏ、＾４２Ｃａ＾１６Ｏ、＾３１Ｐ＾１６     

仙人掌果汁红色素含量测定与微量元素分析

用可见分光光度法与等离子体发射光谱法对仙人掌果汁色素及其微量元素的含量进行了测定，仙人掌果汁色素含量达２．１％￣３．３％，成熟果的果汁色素含量比预成熟果大。在２７种被测定的元素中，除Ａｓ、Ｂｅ、Ｃｄ、Ｃｏ、Ｍｏ、Ｐｂ，Ｓｂ，Ｔｌ等未被检出外，其余Ａｇ，Ａｌ，Ｂ，Ｂａ，Ｃａ，Ｃｒ，Ｃｕ，Ｆｅ，Ｍｇ，Ｍｎ，Ｎａ，Ｎｉ，Ｓｅ，Ｖ，Ｚｎ，Ｋ，Ｐ，Ｓ等均有准确测定值。成熟果与预成熟果的果汁微量元素含量无明显     

计算机模式识别法在甲状腺肿瘤患者血清微量元素谱研究中的应用

用马氏距离判别法对５３例甲状腺肿瘤患者和５８例健康人血清中Ｂａ、Ｃｒ、Ｍｇ、Ｍｎ、Ｍｏ、Ｓｒ、Ｚｎ、Ｆｅ、Ｃｕ和Ｃａ等元素含量进行了分类研究,分类准确度达９２．８％。研究结果表明,甲状腺肿瘤病变可能与人体中Ｍｏ、Ｍｎ、Ｆｅ、Ｍｇ、Ｃａ和Ｓｒ含量异常有关。文中还计算了患者和健康人血清元素间的相关系数,并讨论了其差异性。     

智力超常儿童发样微量元素研究

用Ｘ射线荧光法，以病例一一对照１：１配对对智力超常儿童及对照儿童的发样，进行Ｃａ、Ｍｎ、Ｃｒ、Ｆｅ、Ｎｉ、Ｃｕ、Ｚｎ、Ｍｇ、Ａｓ、Ｐｂ、Ｃｄ、Ｃｏ、Ｍｏ、Ｇｅ和Ｓｅ等十五种微量和宏量元素检测。结果显示：单因素统计处理，智力超常儿童Ｃａ、Ｚｎ和Ｎｉ等元素含量显著或非常显著地高于对照组儿童（Ｐ〈０．０５或Ｐ〈０．０１），而Ａｓ发样含量极显著低于对照组；经逐步相关回归分析，元素Ｚｎ与Ａｓ被引入方程，提示     

用中子活化分析法研究25种元素在人体肝脏亚细胞组分中的分布

采用差速离心分离技术与中子活化分析法（ＮＡＡ）相结合的方法分析了人肝２５５中元素,并用标准参考物保证结果的准确性。分析结果表明,大多数元素在各亚细胞组分中并非均匀分布。Ａｓ、Ａｕ、Ｃｏ、Ｉ、Ｍｇ、Ｓｂ、Ｓｅ在细胞核和线粒体浓度最高。Ａｌ、Ｓｓ、Ａｕ、Ｂａ、Ｆｅ、Ｉ、Ｍｇ、Ｍｏ、Ｓｂ、Ｓｃ在细胞核和线粒体浓度最高。Ａｌ、Ａｓ、Ａｕ、Ｂａ、Ｆｅ、Ｉ、Ｌａ、Ｍｇ、Ｍｎ、Ｓｂ、Ｓｅ在胞液中深度最低,生物体     

健康人及尿石患者头发中微量元素的相关性研究

用ＩＣＰ－ＡＥＳ测定了尿石症高发现地区－广东省东莞市尿石症患者发中Ｃａ，Ｍｇ，Ａｌ，Ｃｄ，Ｃｏ，Ｃｒ，Ｍｎ，Ｆｅ，Ｃｕ，Ｍｏ，Ｚｎ，Ｂａ，Ｓｒ等十三种微量元素，并和健康人进行比较，经ｔ检验发现：Ｂａ，Ｃｄ，Ｍｏ，Ｓｒ，Ｍｎ，Ｚｎ和Ｍｇ／Ｃａ比值间存在显著性差异。     

男女青少年头发中9种元素含量的比较

对广西玉林２８６名女性和４２４名男性７～１６岁青少年头发９种元素含量进行了比较研究。结果显示,除在１３～１６岁组头发中Ｍｇ的含量女性高于男性外,其余各年龄组各元素含量男性均高于女性;各组男女间的比较,表现为：７～９岁组Ｃａ、Ｃｏ、Ｚｎ有非常显著性差异,Ｆｅ、Ｓｅ、Ｃｒ有显著性差异：１０～１２岁组Ｃａ、Ｃｏ、Ｚｎ、Ｃｒ有非常显著性差异,Ｍｇ、Ｆｅ、Ｓｅ有显著性差异：１３～１６岁组Ｃａ、Ｃｏ有非常显著     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.