查询词典 ortho-hydrogen

Artificial acidification can be achieved by the addition of lactic, acetic , tartaric or citric acid to rye dough or by adding acidic forms of sodium and calcium salts of ortho- and\0r pyrophosphoric acids.

通过向黑麦面团中添加乳酸、醋酸、酒石酸或柠檬酸或添加酸性正磷酸和\或焦磷酸的钠盐和钙盐就可以实现人工酸化面团的目的。

Sing Scenedesmus obliquus entrapped in calcium-al-ginate gel for purifying sewage,this paper studied the purification efficiencies of ammonia-nitrogen and ortho-phosphate by immobilized algae and its changes of growth, the content of chlorophyll a, photosynthesis and per oxidase,and comparison with free algae.

将斜生栅藻包埋固定在褐藻酸钙凝胶胶珠中。对人工配制的污水进行净化，研究其对污水中氨氮和正磷酸盐的净化效率以及净化过程中藻类的生长，叶绿素α含量、光合强度和过氧化物酶活性的变化。

The results show high selectivity when the temperature is controlled at 50 CC , and the nitrated reaction time is 90 mm, toluene is nitrated by using 95% nitric acid as nitrating reagent at the presence of acetic anhydride, 1.0g silicotungstic acid catalyst is calcinated at 300℃ for 1.5h. The o/p (ratio of ortho to paro isomer of toluene nitration) ratio is 0.89 in product distribution of toluene nitration, lower than 1.67 using sulfonitric acid as catalyst. The yield of products is 91.6%.

结果表明，在醋酐存在条件下，以CCl4为溶剂，以质量分数为95%的硝酸为硝化剂，反应温度控制在50℃，反应60 min， 1.0g经300℃焙烧1.5h后的硅钨酸催化剂，对甲苯表现出强的区城选择性，甲苯硝化产物o/p值（甲苯硝化产物邻位和对位异构体的质量比）达0.89，较硝硫混酸的1.67显著降低，产物收率达到91.6%。

The measurement of apparent volume change is described during cure reaction of a new spiro ortho -carbonate, 3, 9, di (p-methooxybenzyl)- 1, 5, 7, 11-tetraoxspiro (5,5) undecaneand epoxy resin, and the volume expansion ratio of this new monomer is culcu-lated,and its applications are approached.

叙述了新的螺环化合物3，9-二-1，5，7，11-四氧杂螺环[5，5]十一烷与环氧树脂进行固化反应时，其表现体积变化率的侧定方法，推算了这种新单体的体积膨胀率。

The arylation showed high regioselectivity and only occurred on the less sterically hinderd ortho-C—H bond. The reaction could be compatible to diverse functional groups such as CH3, CH3O, and CH3CO, as well as Br and Cl substituents, which would permit to be functionalized further to construct new compounds with more complicated structures.

实验结果表明，反应表现出明显的区域选择性，芳基化只发生在空间位阻较小的sp2 C—H键上，反应可以采用多种取代基(如CH3O， CH3CO， Br和Cl)进行，这有助于通过进一步反应构建更为复杂的新化合物。

The production technology of triethyl ortho - formate as medicine intermediate is reviewed.

综述了医药中间体原甲酸三乙酯的生产工艺，重点介绍了二步法、一步法、氢氰酸法、酯交换法和相转移催化法的合成原理与生产工艺，并对这几种生产工艺进行了评述。

The first part of this study is focused on the synthesis and electro-optical properties and of poly(2,3-diphenyl-1,4-phenylene vinylene) containing polyethylene oxide side chains. The formation meso-structure nanocomposites by sol-gel process with tetraethyl ortho-silicate was demonstrated .

第一部份为聚-(2，3-双苯基-1，4-仲苯基乙烯)侧链接上聚环氧乙烷之合成、光电性质研究及透过溶胶-凝胶制程研究其自组装之奈米复合材料。

D-Pantothenyl alcohol, also called ortho-vitamin 85, is an important nutrition suppled substance. It has been widely applied in the field such as medicine, cosmetic, foodstuff, feed additive, and so on. The preparation of D-pantothenyl alcohol and the optimization of key factor are discussed mainly in this paper. It mainly includes three section.In the first section, with formaldehyde, isobutyl aldehyde and diethyl oxalate as the starting materials, D-pantolactone is prepared via three steps including condensation, catalytic hydrogenation and physical resolution. The specific rotatory power of the product is consistent with imported product.

D-泛醇，俗称原维生素B_5，属维生素B旋类营养增补剂，广泛应用于医药、化妆品、食品、饲料等领域，本文着重探讨了其制备及关键因素的优化，主要内容可分三部分：第一是D-泛内酯的制备，先以甲醛、异丁醛和草酸二乙酯为起始原料合成酮基泛内酯，再经催化氢化得到DL-泛内酯，然后通过物理拆分获得D-泛内酯，得到产物的比旋光度与进口产品基本一致。

Ortho introduces The Coombs Test to identify sensitized Rh-negative patients.

奥索引入了库姆斯氏试验以识别致敏Rh阴性患者。

L-fucose, as raw material, protected with ortho ester, synthesized the glycosyl acceptor 60, 76, thioglycoside doner 57、61、62, fluorglycoside 65、66 and Schimidt doner 68, 70 in a simple and efficient way.

本文从L-岩藻糖出发，以原酸酯保护的方法简单高效的合成了具有合适保护基的糖基受体60、76，糖基供体57、61、62、65、66、68及70。

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。