可酸化的

Starch esterification was proceeded with native cassava starch and three saturated free fatty acids: capric acid (C10:0), myristic acid (C14:0) and stearic acid (C18:0). The fatty acid modified starch was prepared by using lipase PS as the catalyst.

中文摘要本研究以天然树薯淀粉为反应基质，与三种不同链长饱和脂肪酸羊蜡酸(C10：0、肉豆蔻酸(C14：0)与硬脂酸(C18：0)分别於水相及有机相行酯化反应，并且以工业中常用的脂肪水解酶lipase PS催化酯键合成，可得脂肪酸修饰淀粉(fatty acid modified starch， FAMS)。

Mordenite has a significant effect on the activity of catalyst, results of test showed: with soluble glass as main feedstock and addition of crystal precursor, thecrystalization time can be reduced, and the synthesized mordenite has higher surface area and structure of small crystal particulate and big pore diameter. Through ion exchange with ammonium and acid, the synthesized mordenite is suitable to prepare isomerization catalyst.

丝光沸石对催化剂活性有较大影响，试验结果表明：以水玻璃为主要原料，加入晶种可缩短晶化时间，合成的丝光沸石具有较高的比表面积及小晶粒大孔径结构，经铵交换及酸交换后适于制备异构化催化剂。

The invention relates to a preparation process for synthesizing polyethylene terephthalate 1, 3- terephthalate catalyst, which comprises adding titanic acid ester, germanium compounds and cobalt compound into liquid dispersed phase of organic solution, wherein the total weight concentration is 4-10%, and preparing the catalyst through mechanical stirring or ultrasonic wave mixed ligand for 10-60 minutes in 0-120 DEG C, wherein the adding content of titanic acid ester, germanium compounds and cobalt compound are respectively 200-500ppm, 50-300ppm and 100-400ppm of reaction monomer mass of terephthalic acid or dimethyl terephthalate.

本发明涉及一种合成聚对苯二甲酸1，3-丙二醇酯催化剂的制备方法，将钛酸酯、锗化合物和钴化合物加入到有机溶剂的液体分散相中，总重量浓度为4～10％，在0-120℃通过机械搅拌或超声波混配10-60min制得；钛酸酯、锗化合物和钴化合物加入量分别是对苯二甲酸或对苯二甲酸二甲酯反应单体质量的200-500ppm、50-300ppm、100-400ppm；用此催化剂制备PTT产品，酯化和缩聚反应时间相对于单独使用钛酸四丁酯缩短了30-60min，产品特性粘数0.70-1.05dL/g，色相b值在2-6之间，切片可用于加工新型合成纤维及工程塑料产品。

The problem that noxious chrome of sexavalence and trivalence is present in the galvanizing coat and passivating solution of the prior art is solved substantially by the passivating solution of the present invention.

本发明提供的无铬钝化液可以从根本上解决了现有的产品镀锌层及钝化液中含有有毒有害的六价铬和三价铬元素的问题，并可真正替代现有的含有六价铬和三价铬的铬酸盐钝化液，实现对电镀锌层和热镀锌层的钝化。

Therefore esterification crosslinked reactionbetween polyearboxylic acid and wood can be quantitatively determined.According toexperiment results of stereoscopic configuration choices by crosslinking agents,crosslinkingreaction between model of reaction intermediate and wood,and the intermediate characteristic incrosslinking reaction,crosslinking reaction intermediate was proofed.We can infercrosslinking reactions between polycarboxylicacid and wood want through a mechanism of twosteps reaction process,the first cyclic anhydrides were formed as intermediates by dehydratingbetween hydroxyls in polycarboxylic acids,second esters were occurred by substitution reactionbetween wood hydroxyls and cyclic anhydrides.

从而可全面定量表征木材与多元羧酸类化合物的酯化交联反应；依据交联剂立体构型选择性、反应中间体模型物与木材的交联反应和交联反应中间体的波谱特征实验结果，证实了交联反应中间体，因此可以推测：多元羧酸类化合物与木材化学组分的交联反应是经历两步反应的机理，首先多元羧酸中相邻羧基的羟基之间脱水形成五元环酸酐中间体，然后木材的羟基与酸酐发生亲核取代反应形成酯。

There were detectable expression and tyrosine-phosphorylation of STAT3 in the decidual cells on days 5 and 6 of pregnancy.

在妊娠第5～6天的蜕膜化基质细胞中可检测到STAT3表达及酪氨酸磷酸化。

The effect of N-phosphoamino acids on plant cells'membrane permeability was investigated by osmotic method. It was found that in all N-phosphoamino acids, only some phosphoryl polar amino acids such as DIPPSer, DIPPThr, DIPPHis, DIPPAsp, DIPPGlu, DIPPAsn and free serine, threonine could increase the water permeability in plant cell membrane. For example, after 20min. treatment by 1. 5mM DIPPSer, the deplasmolysis time of onion cells was shortened 50%.

三、通过透性实验研究了N-磷酰化氨基酸对洋葱、豌豆等植物细胞膜水透性及溶质透性的影响，发现在所有的N-磷酰化氨基酸及自由氨基酸中，仅有部分N-磷酰极性氨基酸和自由的丝、苏氨酸对植物细胞膜上水透性有增强作用，如1.5mM N-磷酰化丝氨酸可使洋葱细胞质壁复原时间缩短一半以上。

Results HE staining showed that sulindac could inhibit the growth of tumor cells, with the morphological presentations as apoptosis and necrosis including pyknosis, karyorrhexis and chromatin crescent formation, etc. By electron microscopy, cells also had apoptotic characteristics including chromatin crescent formation and apoptotic body. Immunohistochemistry and Western-blot assay results showed that 48 hours after sulindac administration, the expression of NF-κB, bcl-2 and bax gradually decreased, while the level of bax protein gradually increased, in a dose dependence manner.

结果 苏木精－伊红染色检测结果显示舒林酸抑制肿瘤细胞生长，肿瘤细胞出现核固缩、核碎裂、染色质边集等凋亡及坏死的形态学表现；电镜下可看到染色质边集、凋亡小体；免疫组化、Western-blot结果显示舒林酸作用48 h后人胃癌SGC-7901细胞NF-κB、bcl-2表达逐渐下降，bax表达逐渐上升，具有剂量依赖性。

The results showed that intermidiate 1, 2-propanediol-sebacate of low relative molecular mass was synthesized with toluene-p-sulfoinc acid as catalyst, benzene as watercarrying agent, and of mole ratio of sebacic acid to 1, 2-propanediol of 1:4. The glass-transition temperatures of PPSC were below 0 ℃ which confirmed that PPSC would be in a high-elastic state of ambient temperature and human body temperature. PPSC was a elastomer with moderate crosslinkage, low module and high elongation, and had rapid degradation ratio (degradation degree more than 50%) in phosphate (pH value 7.4) at 37℃.

结果表明，以对甲苯磺酸为催化剂、苯为带水剂，在酸醇比为1，4的条件下可合成较低相对分子质量的中间体癸二酸聚酯二元醇；PPSC弹性体的玻璃化转变温度在0℃以下，于室温及人体温度下处于高弹态；PPSC为适度交联的、低模量高伸长的弹性体，其在37℃、pH值为7.4的磷酸盆缓冲溶液中具有较快的降解性（降解度超过50%）。

The result of potassium malonyloxyborohydride as a new hydroboration reagent reacts with terminal alkenes and alkynes is described.

介绍新的硼氢化试剂丙二酰氧基硼氢化钾与链端烯炔烃的作用，烯烃的硼氢化物在PTC条件下，插入∶CCl2 ，可得饱和羧酸；炔烃则难以与之硼氢化。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。