门诊儿童微量元素现状分析

为调查门诊儿童微量元素现状及相关疾病的发病率，检测了248例门诊儿童血锌、钙、铁、铜、铅值，并分析了相关疾病患病率。结果表明，本地区门诊儿童锌缺乏率76．2％，钙缺乏率71．37％，铜缺乏率19．29％，铅中毒率39．19％，全血铁测定缺铁比例87．92％。提示门诊儿童存在微量元素失衡现象，应采取适当措施予以纠正。     

广州员村地区0—6岁健康儿童头发微量元素分析

为观察不同年龄、性别健康儿童微量元素之间的关系，对广州员村地区７５４名０￣６岁儿童进行了头发微量元素锌、铁、铜以及宏量元素钙测定。结果表明：新生儿发锌明显高于其他年龄组；６个月￣１岁儿童发锌、铁、钙均低于其他年龄组，与各年龄组比较有显著差异；５￣６头儿童发铜低于其他年龄组，且女童发铜、钙高于男童（Ｐ〈０．０５），提示在不同年龄、性别儿童之间头发微量元素含量存在一定差异。     

海口市正常儿童头发中四种微量元素含量

用电感耦合等离子体发射光谱法（ＩＣＰ－ＡＥＳ），测定了海口市２６６例正常儿童头发中锌、铁、阵、铜四种微量元素的含量，计算出海口市儿童四各微量元素的正常范围。并与其它地区文献报道值进行了比较。     

火焰原子吸收法连续测定儿童头发中微量元素

提出了用火焰原子吸收法连续测定儿童头发中六种微量元素的方法.儿童头发经处理后,可直接用火焰原子吸收法连续测定其中的铜、锌、铁、钙、镁、锰.方法的精密度(RSD)<11 %,标准加入回收率为95.4%～103.8%,结果满意.     

西安市学龄前儿童末梢血微量元素检测结果分析

为探讨西安市学龄前儿童末梢血微量元素现状及其含量与年龄及性别的关系,对2 350例学龄前儿童末梢血中铜、锌、钙、镁、铁5种元素进行了测定,用SPSS 16.0做统计分析.结果表明,受检儿童末梢血中锌、钙、铁缺乏严重,铜和锌含量在年龄上具变化规律,且铜在性别间存在显著差异.提示应充分认识微量元素对儿童健康的重要性,定期对...     

矮小儿童血清微量元素分析

为通过分析矮小儿童血清生长激素(hGH)及微量元素水平,探讨微量元素在儿童生长发育中的重要作用,回顾性分析了176例矮小儿童空腹血清hGH及微量元素锌、铁、铜、钙、镁水平,其中血清微量元素含量用原子吸收分光光度法测定,而hGH采用hGH激发试验,并应用化学发光法测定。结果表明,55.68%的矮小儿童伴有微量元素缺乏,其中血清钙、锌、镁明显低于正常儿童(P<0.05),分别为(2 158.44±147.82)μmol/mL、(14.06±4.03)μmol/mL、(794.78±86.23)μmol/mL。提示矮小儿童应注重补充微量元素,均衡饮食,以满足机体生长发育所需。     

320例儿童手指血微量元素结果分析

为对门诊健康体检的320例0～10岁儿童手指血的微量元素及其相关情况进行分析,用原子吸收光谱仪测定了其指血的铜、锌、钙、镁、铁的含量。结果表明,锌缺乏随着年龄的增加逐渐减少,铁、钙缺乏随着年龄的增加而逐渐增多。提示孝感市1个月-10岁的儿童存在一定的微量元素缺乏,应注意均衡饮食,加强锌、铁、钙的补充及吸收。     

微量元素与儿童行为关系探讨

用原子吸收分光光度法（ＡＡＳ）测定了１４３例小儿发中锌、铁、铜、钙、铅、镁等元素含量。探讨了微量元素对儿童行为的影响。     

儿童头发中微量元素锌、铜、铁和锰的原子吸收光谱测定

微量元素铜、锌、铁和锰是人体重要的营养元素,在体内具有重要的生理功能及营养作用。随着微量元素与人体健康学研究的不断深化,头发作为人体微量元素的次要排泄器官之一,其含量能反映个人较长时间内元素的积累状况及体内水平而受到重视。目前,国内外采用原子吸收法以及其它方法进行分析测定均有报道。在大多数原子吸收测定中,分析者都是用成年人的头发为测试样品,而对儿童头发作为测试样品很少见报道。本文研究了用火焰原子吸收光谱法测定儿童头发中微量元素铜、锌、铁和锰。该法具有操作简单、快速、准确、经济等优点。测定灵敏度、精密度好,相对标准偏差小于±3％。     

太阳神奶对学龄前儿童全血中微量元素的影响

选择5～6岁儿童64名，随机分为两组，分别服用太阳神奶(A组)和一般乳酸奶(B组)，每天服用100mL。连服9周，检测全血中微量元素锌、铁、铜、钙、锰的变化。经检测，服用太阳神奶A组经统计学分析，微量元素锌、铁、锰呈显著或非常显著变化。     

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.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

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.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

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.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

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.