多酸的

The reaction of polyfluoroalkyl iodides with 4-pentenoic acids initiated by sodium dithionite was realized to give polyfluoroalkyl substituted lactones.

我们研究了多氟烷基碘代烷与4-戊烯酸类化合物等在连二亚硫酸钠引发下的反应，得到了氟烷基取代的内酯化合物，我们将该反应称为氟烷基化内酯化反应；并建立了一个利用该反应合成含氟内酯的新方法，首次利用氟烷基化内酯化反应进行高立体选择性双环含氟内酯及手性含氟内酯等的合成，已合成含氟内酯新化合物50余种。

Inthe present study, 1 mg of the dulse extract exhibited atotal polyphenol content approximating 10.3 lg gallicacid equivalents indicating the presence of compoundswith phenolic functional groups in the extract..

在本研究， dulse萃取物的1毫克在萃取物陈列了一总表明化合物的出现多酚美满的接近的10.3 lg五倍子酸等值与酚醛功能小组。

Through the research, we found that the appropriate readjustment India ore and the Yangchun ore allocated proportion, uses the iron material match level 4 to carry on sinter under the unchanged iron material and craft condition, produces the much calcium ferrite and fayalite, obtains the melting corrosion structure and the granular structure as primarily sinter which may enhance the strength.

凡在烧结时能产生较多的液相，冷却时不是形成结晶较差的玻璃质，而是形成充分结晶的针状或树枝状、棒状铁酸钙；磁铁矿不是以块状孤立存在，而是被粘结相交织固结成熔蚀结构、粒状结构或共晶结构；气孔较少，且分布均匀；粒度较细；组织结构均匀的烧结矿均能提高质量。

Prediction for secondary structure and function suggested that the 23rd amino acid residue-cysteine and nearby sequence is in a consensus pattern of Glyceraldehyde 3-phosphate dehydrogenase active site, in which the Cys is the catalytic residue, and there are some potential sites which may have biological signification in E20-GPD.

二级结构和功能预测分析表明，E20-GPD第23位的半胱氨酸及其附近序列为3-磷酸甘油醛脱氢酶活性位点一致序列，C为活性位点，第50位的组氨酸也是十分保守的，且E20-GPD具有多个可能的有生物学意义的位点。

The analysis proves that bonding agents can act as the liner of CL-20 and a bonding agent containing hydantoin and tripolyisocynate,which is defined as 22~#,is the best liner of CL-20 owing to its cyclic structure and polar groups.

结果表明，键合剂可以作为CL-20的包覆剂；由于海因和三聚异氰酸酯键合剂(22#)的环状结构以及具有较多的极性基团，对CL-20的包覆性最好。

MMA is produced by the method of acetone-cyanhydrin mainly in our country. The synthetic route is complex, the technical line is long, and the yield is low with high cost after many steps. Hydrocyanic acid is used as raw material, the treatment of numerous waste acid is difficult . Furthermore, concentrated sulfuric acid consumed in this method corrodes equipments and pollutes the environment seriously.

我国MMA的生产以丙酮腈醇法占主导地位，合成路线复杂，生产工艺长，多步反应后产率低，成本高，其采用有剧毒的氢氰酸为原料，产生大量难于处理的废酸，所消耗的浓硫酸对设备腐蚀性大，对环境污染严重，因此开发新的MMA工艺路线很有必要。

Since isolated and purified from Jack bean in 1919, concanavalin A has been used widely especially as an polyclonal mitogen. ConA can stimulate T lymphocytes blast, induce protein-tyrosine phosphorylation in human neutrophils and increase resistance of mice to peritoneal infection by Serratia marcescens.

ConA从1919年被分离纯化以来得到了广泛的应用，是一种有效的多克隆有丝分裂原，可刺激T淋巴细胞增殖及中性粒细胞酪氨酸磷酸化，增强小鼠对白色念珠菌的吞噬功能、对粘质沙雷菌的抵抗力。

The CNTs were characterized with the transmission electron microscope and infrared spectroscopy. In addition, the dispersion of the CNTs in water was investigated with the optical microcopy and the viscosity meter. The FTIR spectrum experiments showed that there were many hydroxyl groups and carboxyl groups, on the surface of the acid-treated CNTs.

采用硫酸和硝酸混合酸对催化裂解法制备的多壁碳纳米管进行纯化，然后运用十六烷基三甲基溴化胺对CNTs进行修饰，并利用透射电子显微镜、红外光谱和拉曼光谱表征了CNTs的表面结构；另外，通过数码照相机和乌氏粘度计研究了修饰的CNTs在水中的分散性能。

With maintenance at 10,000 to 25,000 subtracting the up to 5000 in CLO, with the rest in fish oil A or vit A palmitate

有些家长报告说也可能从更小剂量的方案中获益，就像我当初建议的第一天250，000 iu ，然后200，000，再150，000等等，维持剂量在10，000－ 25，000（减去 OLC 中量可多大5000iu ，其余的用鱼油或棕榈酸盐形式的 Vitamin A ）。

After several decades, the tireless efforts of several generations of people, has now developed into a provincial owned paint Institute, 8 production base, five branch offices and 24 holding subsidiaries specializing in the production of paint coating integrated enterprises, production 18 major categories of more than 3000 varieties, varieties have polyester, polyurethane, nitro, perchlorethylene, acrylic, epoxy, silicone, alkyd, natural resins, phenolic, asphalt, etc., are widely used in automobile, heavy industries, ships, bridges, sports facilities, chemical, pharmaceutical, power plant, metallurgy, electronics, light industry, food, city utilities, roads, railways, household appliances, furniture, architecture, decoration and other social production in all aspects of life.

经过几十年、几代人的不懈努力，现已发展成为拥有1个省级涂料研究所、8个生产基地、5个分公司及24个控股子公司的专业生产涂料油漆的综合企业，生产18大类3000多个花色品种，品种有聚酯、聚氨酯、硝基、过氯乙烯、丙烯酸、环氧、有机硅、醇酸、天然树脂、酚醛、沥青等，广泛用于汽车、重工业、船舶、桥梁、体育设施、化工、制药、电厂、冶金、电子、轻工、食品、城市公用设施、公路、铁路、家电、家具、建筑、装修等社会生产生活的各方面。

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。