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The beheviour of four low-molecule weight organic acid lactic acid,hydroxy-acetic acid,mercapto-acetic acid,glyconic acid as iron-containing silicate-aegirines depressants on the hematite direct flotation is investigated in this paper.The results of flota

本文研究了四种小分子有机酸抑制剂乳酸、羟基乙酸、巯基乙酸、葡糖酸在赤铁矿正浮选中对含铁硅酸盐脉石霓石的抑制行为,纯矿物、人工混合矿与实际矿石浮选实验均证明了它们具有良好的选择性抑制作用,可以成功地实现赤铁矿与霓石的浮选分离。

In this paper, the properties of sulfur-containing cellulose derivatives, sulfhydryl cellulose and cotton cellulose xantante, were studied as well as their adsorption properties and mechanisms to heavy metal ions.

研究了含硫纤维素衍生物:巯基纤维素和纤维素磺原酸酯这两种材料的性能及它们对重金属离子的吸附性能和吸附机理。

The anti-cancer effects of garlic garlic from its contain thiol compounds (for example: diallyl disulfide), these substances can affect the metabolism and elimination of carcinogens, thereby protect human health.

大蒜 大蒜的防癌功效来自其所含的巯基化合物,这类物质可以影响体内代谢及消除致癌物,进而保护人体的健康。

Expanded MSCs were induced to differentiate into nerve cells withthree different treatment protocol in the prensent study . On the following day, the medium was replaced with preinduction medium consisting of DMEM, 20% FCS, and 10 ng/ml basic fibroblast growth factor. After 24 h, the preinduction medium was removed, the cells were washed twice with PBS, and neuronal induction medium containing DMEM supplemented with 2% DMSO and200 m bu-tylated hydroxyanisole was added. In later experiments, we used DMEM with 5 mM p - mercaptoethanol or sulfo - glycerine as an alternative neuronal induction medium for the same incubation.

将待诱导分化的MSCs按0.4x10~6/ml接种于事先放置有消毒盖玻片的六孔板内制备细胞爬片,分别采用三种不同的方法诱导第2代至10代的MSCs向神经细胞分化,即方法1先用含bFGF的培养基进行预诱导,之后再用含叔丁基对羟基茴香醚,和二甲亚砜的无血清培养基进行诱导;方法2和方法3用B-巯基乙醇和硫代甘油进行预诱导,然后不同浓度的上述物质进行正式诱导。

The literature about the synthesis of the ion exchange and chelating adsorbents used in the off-line separation and preconcentration of the noble metals and the development of the on-line microcolumn separation and preconcentration of the noble metals were reviewed. Four silica gel-based adsorbents with rhodanine, 2-mercaptopyrimidine, 2-mercaptothiazoline and isophenylthiourea as the functional groups were first synthesized and applied to the on-line separation and preconcentration of silver, gold, palladium and platinum for their FAAS determination.

本论文在回顾螯合吸附材料的合成及其在贵金属的离线和流动注射在线预浓集分离发展状况的基础上,首次合成了含罗丹宁、2-巯基嘧啶、2-巯基噻唑啉和异二苯基硫脲等四种以硅胶为载体的螯合吸附剂,并用于银、金、钯和铂的流动注射微填充柱在线预浓集分离、火焰原子吸收光谱分析。

In order to obtain versatile ulitity of host molecules, three new chiral calix [4] crown ethers containing aza, thio atoms bearing two chiral sites provided by -cysteine ester were synthesized by the condensation of calix [4] arene diacid dichloride with oligoethylene glycol bridged bis-amino acid methyl ester. All new compounds were characterized by NMR, MS and elemental analysis.

以-半胱氨酸为手性源,利用多甘醇二氯醚在碱性条件下对半胱氨酸巯基进行烷基化反应,成功地合成了多甘醇醚链桥联的半胱氨酸衍生物,醚化反应后,在高度稀释条件下与对叔丁基杯[4]芳烃二乙酰氯进行双功能基缩合反应成功地合成了新型的手性杯[4]含氮、硫杂冠醚,并利用〓H NMR、MS等谱图手段对其结构进行了表征。

In chapter four, five new monomeric solvated biscyclopentadienyl lanthanide thiolates,〓THF (Ln = Ho, Yb, La, Y, Gd), have isolated by reaction of 〓 with2-mercaptopyrimidine in THF solution, which have been confirmed by elementalanalyses, IR, MS and 〓 NMR spectra.

三、通过1∶1摩尔比的三茂基稀土配合物〓(Ln=Ho,Yb,La,Y,Gd)与2-巯基嘧啶在四氢呋喃中反应,得到了五个新的含茂基和烃硫基的稀土有机配合物。

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I didn't watch TV last night, because it .

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Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

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