二酸的

Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.

酰亚胺源自氨的一种化合物，含有与一个二价酸基或者二个一价的酸基结合的氨基

The effects of sodium laurylsulfonate and butanol on upper critical solution temperature s for water-phenol were studied by means of cloud point.

浊点法研究了十二烷基磺酸钠和正丁醇对水-苯酚系统上临界溶解温度的影响，结果发现在试验的浓度范围内，该系统的上临界溶解温度随十二烷基磺酸钠质量分数的增大而线性下降。

The excess of ethyl orthosilicate should render the chain terminal unreactive toward the crosslinking...

降解是由于水在二月桂酸二丁基锡酯或它的水解产物月桂酸催化下使聚二甲基硅氧烷主链的Si—O—Si键水解所引起的。

Given the current complexity of industrial recovery of 3'-methyl-2'-butenyl 3, 3-dimethyl-pentenoate and the decomposition problems with 2-methyl-1-butene, research was conducted on a process for direct recycling of MBDP involving an ester exchange reaction of MBDP with either methanol, trimethyl orthoacetate, or solutions of methanol and trimethyl orthoacetate.

针对目前工业上回收3，3-二甲基－4-戊烯酸－3'-甲基－2'-丁烯酯工艺复杂、异戊烯大量分解问题，研究了MBDP直接返回循环使用工艺，MBDP与甲醇、原乙酸三甲酯或与甲醇原乙酸三甲酯混合溶液进行酯交换反应的回收新工艺，比较了四异丙基钛酸酯、甲醇钠、氢氧化钾用作酯交换催化剂的效果，筛选出回收MBDP&一锅煮&最佳工艺：按照n：n：n：n＝1.0：9.8：9.2：0.05物质的量比投料，74℃~78℃反应21h，MBDP转化为贲亭酸甲酯和异戊烯醇，单程转化率87.7%，用85%的磷酸中和甲醇钠，蒸出甲醇，直接用于合成贲亭酸甲酯。

The results showed that 1,5-naphthalene disulfonic acid could be degradated effectively by the catalytic supercritical wa...

结果表明，催化超临界水氧化技术能有效地降解1，5-萘二磺酸，COD去除率可达98%以上；随着反应温度的升高，停留时间的延长，COD去除率也提高；1，5-萘二磺酸在超临界水中催化氧化降解反应的级数对COD和氧气分别为0.89和0.28，活化能为56.8 kJ/mol。

Among the six polyetherimdes, ODPA-IPDA with the largest free-volume and larger intrasegmental mobility has the highest permeability and the lowest permselectivity, ODPA-DABP with the smallest free- volume and the smallest intrasegmental mobility has the lowest permeability and the lowest permselectivity, ODPA-DMMDA with the larger free-volume and smaller intrasegmental mobility has higher permeability and higher permselectivity.

二苯醚四酸二酐（ODPA－4.4＇－二J氨基二苯异丙烷具有很大的自由体积和较小的链段活动性、很大的透气性和较小的透气选择性，ODPA—4，4'－二氨基二苯酮具有很小的自由体积和较小的链段活动性、很小的透气性和较大的透气选择性，ODPA—3，3'－二甲基二苯甲烷二胶具有较大的自由体积和较小的链段活动性、很大的透气性和很大的透气选择性。

Two kinds of polyimide films were prepared based on the ODA and ODPA in NMP through two-step thermal or chemical imidization process and characterized by the cone and plate viscosimeter, GPC, FTIR, DSC, TGA and strain properties tests.

以4，4'-二胺基二苯醚和3，3'，4，4'-二苯醚四酸二酐为单体，采用两步法，分别经热亚胺化和化学亚胺化过程制备了两种聚酰亚胺薄膜，并对两种薄膜的性能进行了表征。

Moreover, MeJA induced defense genes, such as pathogenesis-related proteins (PR2a), phenylalanine ammonia-lyase, BX9, and TPS. MeJA also increased DIMBOA and Vannillic acid content of leaves and roots significantly but leaf p－Hydroxybenzoic acid concentration was decreased significantly and Protocatechuric acid was produced in roots only.

1MeJA叶片处理能诱导叶片和根系中丙二烯氧化物环化酶基因、糖基转移酶（BX9）基因、苯丙氨酸转氨酶基因的表达，使叶片和根系中丁布含量升高，同时，6μL/L MeJA处理使第二叶中原儿茶酸含量显著降低，诱导根中产生原儿茶酸，使第二叶中香草酸含量和根中未知物质峰面积显著增大。

In this dissertation, preparation of polysubstituted ethene and heterocyclic compounds based on 2-hydroxyalkyl phenyl selenides andα-phenylselenopropionic acid reagents were further investigated as follow: Firstly, O-ethyl-O-vinyl phosphonates were prepared in a one-pot, two-step transformation by Mitsunobu reaction of 2-hydroxyalkyl phenyl selenides with monoethyl esters of phosphonic acid in the presence of diethyl azodicarboxylate and triphenyl phosphine (PPh3) followed by oxidation-eliminatio...

中文摘要：本文主要进一步探索了2-羟基烷基苯基硒醚、α-苯硒基丙酸试剂在制备多取代乙烯和杂环化合物反应中的应用，具体研究内容和结果如下：一、在偶氮二羧酸乙酯和三苯膦(PPh3)存在下，苯基-2-羟基烷基硒醚和O-乙基膦酸单酯发生Mitsunobu反应，无需分离和纯化反应中间体，直接使用30 %的双氧水进行氧化-消除反应，提供了&两步、一锅&合成O-乙基-O-乙烯基膦酸酯的新方法，该方法反应条件温和，操作简便，产物收率良好(76-82 %)。

Like other piscine IL-8 sequences, the sea perch IL-8 lack ELR motif upstream the CRC, and the third amino acid of Arg was substituted by His.

花鲈IL-8序列中用于形成二硫键的4个半胱氨酸保守，前2个半胱氨酸被1个精氨酸分开，形成CXC结构。

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。