D - double bond 中文

double bond 【化學】雙鍵。

【化學】雙鍵。 “double“ 中文翻譯： adj. 1.兩倍的，加倍的。 2.雙的，二重的，雙重的 ...“bond“ 中文翻譯： n. 〔廢語〕農奴；奴隸。 adj. 被奴役的；奴隸的〔 ...“adjacent double bond“ 中文翻譯：相鄰雙鍵“alpha-beta double bond“ 中文翻譯： α,β-雙鍵“alternating double bond“ 中文翻譯：更迭雙鍵“beta gamma double bond“ 中文翻譯：碳原子與-碳原子間的雙鍵“beta-gamma double bond“ 中文翻譯： β-γ-雙鍵; β-碳原子與γ-碳原子間的雙鍵“carbonoxygen double bond“ 中文翻譯：碳氧雙鍵“cis-double bond“ 中文翻譯：順式雙鍵“conjugated double bond“ 中文翻譯：共軛雙鍵“crossed double bond“ 中文翻譯：橫交雙鍵“cumulated double bond“ 中文翻譯：累積雙鍵“cumulative double bond“ 中文翻譯：累積雙鍵“double barreled bond“ 中文翻譯：以多重稅收作為保證的市政公債; 以雙重稅收作保證的市證公債“double bond equivalence“ 中文翻譯：雙鍵等價值“double bond index“ 中文翻譯：雙鍵指數“double bond isomerism“ 中文翻譯：雙鍵異構性；雙鍵異構現象“double bond migration“ 中文翻譯：雙鍵移位“double bond shift“ 中文翻譯：雙鍵位移“double flemish bond“ 中文翻譯：雙荷蘭式砌合“double-barreled bond“ 中文翻譯：以雙重稅收作保證的市證公債“double-bond isomerism“ 中文翻譯：雙鍵異構“double-bond isomerization“ 中文翻譯：雙鍵異構“double-bond shift“ 中文翻譯：雙鍵位移“end double bond“ 中文翻譯：末端雙鍵

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In this thesis , several new fluorescence carriers have been synthesized bearing a carbon chain with a terminal double bond introduced into the molecule and copolymerized with a monomer under uv irradiation on the silanized glass or quartz disk . the sensors prepared were studied . covalent immobilization effectively prevents the leakage of the carrier dye from the sensor membrane , a phenomenon that shortens the lifetime of ordinary optical sensors 本論文合成了幾種含末端雙鍵、可共價固定的新型熒光化合物，并以此作為熒光指示劑，與膜基質單體在光引發劑作用下發生光聚反應共聚在經過硅烷化處理的石英或普通玻片上制成光極膜，制備了對一些物質有響應的熒光化學傳感器。
They cannot naturally produce essential fatty acids - beneficial nutrients found mainly in plant and fish oil , so they must rely on a dietary supply . here we want to establish transgenic mice carry a tissue - specific expression gossypium hirsutum - 6 fatty acid desaturase ( fad2 ) gene which can add a double bond into an monosaturated fatty - acid hydrocarbon chain and convert oleic acid to linoleic 本試驗試圖構建一個肌肉組織特性的- 6脂肪酸去飽和酶(脫氫酶)真核表達載體，通過原核顯微注射法把棉花的- 6脂肪酸去飽和酶導入到小鼠體內，以小鼠為動物模型，建立動物體內的必需脂肪酸合成代謝通路。
Ivermectins ( a mixture containing more than 80 % of 22 , 23 - dihydroavermectin bla and less than 20 % of 22 , 23 - dihydroavermectin b1b ) , which have the same effective antiparasitic activities and the lower level of toxic side - effects than avermectins , are currently synthesized by chemically reducing the double bond between c22 and c23 of avermectins b1 阿維菌素b1在c - 22 , 23位的化學加氫還原產物稱為伊維菌素( ivermectins ) ，具有與阿維菌素相同的殺蟲活性，但毒性更低，更安全。目前國內外報道的伊維菌素生產均是用化學還原法，生產成本很高。
In consideration of the colinearity between the activities of avermectin pks domains and structure of the polyketide product , the dh2 domain of avermectin pks , which corresponds to c - 22 , 23 dehydration , appears to have partial dehydratase activity and this results in a mixture of c - 22 , 23 double bonds ( “ 1 “ components ) and c23 hydroxy compounds ( “ 2 “ components ) 目前國內外尚未見有關僅產阿維菌素b1菌株的報道。根據阿維菌素pks基因結構與其聚酮合成反應步驟之間的線性關系，推測b2組分的產生可能是由于阿維菌素pks模塊2中脫水酶( dh )的不完全活性所造成。
First , a terminal double bond was introduced into 3 - amino - 9 - ethylcarbazole ( aec ) via methacryloyl chloride to obtain the compound , 3 - ( n - methacryloyl ) amino - 9 - ethylcarbazole ( mec ) . second , mec was copolymerized with butyl methacrylate to prepare the mec - immobilized polymer particles . the resultant polymer particles were used as a fluorescence probe , which was almost free of dye leaching , and had higher photostability in comparison with free aec 首先利用甲基丙烯酰氯向3 -氨基- 9 -乙基咔唑( aec )分子中引入末端雙鍵,得到帶末端雙鍵的熒光指示劑3 - ( n -甲基丙烯酰基)氨基- 9 -乙基咔唑( mec ) ,然后通過乳液聚合技術將mec共價固定到聚甲基丙烯酸丁酯基體上,制得一種共價固定了mec的聚合物顆粒。
The chiral compounds synthesized in the project have an unsaturated double bond , which can be mixed with polymerizable nematic liquid crystal compounds , and the resulting mixture can be polymerized to form an optical film having cholesteric liquid crystal texture 具有可聚合基之旋光性化合物可添加于可聚合型向列型液晶單體中，聚合成具有膽固醇相、反射特定波長之光學薄膜，且較少用量之高螺旋扭轉力性質之旋光性化合物即可配出特定螺距之膽固醇液晶紋理。
The modification of ( alkyl ) phenolic resins via epoxidation or with rosin , petroleum resins , and other organic compounds or polymers containing unsaturated double bond were discussed respectively , mainly dealing with modification mechanism , modification methods and their applications 分別討論了（烷基）酚醛樹脂的環氧化改性、松香改性、石油樹脂改性及其他含不飽和鍵的化合物或聚合物改性，主要包括改性原理、改性方法及其應用情況。
The results showed that the breaking strength of the cotton fiber after the limited oxidation by sodium periodate did not decrease remarkably , and the collagen molecules through the c = n double bond of the schiff base combined on the surface of the cotton fiber 結果表明：經高碘酸鈉有限氧化后棉纖維的斷裂強度降低不明顯；膠原蛋白分子通過席夫堿c = n雙鍵共價結合在棉纖維表面。
Though with the smile of his dear face he draws mother ' s yearning heart to him , yet his little cries over tiny troubles weave the double bond of pity and love 雖然他用了可愛的臉兒上的微笑，引逗得他* * *熱切的心向著他，然而他的因為細故而發的小小的哭聲，卻編成了憐與愛的雙重約束的帶子。
Unsaturated polyphosphoester ( uppe ) containing unsaturated double bonds in main chain was synthesized with fumaric acid , 1 , 2 - propylene glycol and phosphorous oxychloride as the initiation materials 摘要以富馬酸和三氯氧磷為起始原料，合成了主鏈重復結構單元中含不飽和雙健的聚磷酸酯。
In a covalent bond , two atoms share a pair of electrons , knitting together the respective electron orbitals . two electron pairs are shared in a double bond 在一個共價鍵中，兩個原子共用一對緊密結合在各自電子軌道上的電子；在一個雙鍵中，有兩對電子共用。
There is alkenyl double bond in the molecular structure and can form linear homopolymer and all kinds of copolymers by various polymerization reaction 該分子結構中含有烯基雙鍵，可以通過各種聚合反應，形成線性均聚物和各種共聚物。
Hydroformylation of the olefinic double bonds was n atom economic method th introduce new functional group in the oil compounds 而通過雙鍵的氫甲酰化反應引入新官能團能為油脂的化工利用提供了一條廣闊的道路。
Lyase an enzyme that catalyzes the separation of two parts of a molecule with the formation of a double bond in one of them 裂解酶：一類能催化一個分子的兩部分分離，并在其中一個上形成雙鍵的酶。
The symmetric structure of oxalic acid molecule and two carboxylic group on both ends ensure the stableness of c = c double bond 草酸分子屬于對稱結構，兩端的羧基使兩個碳原子穩定化。
But that picture of alternating single and double bonds is not the most accurate way of viewing any of these molecules 不過對這些分子來說，這種單雙鍵交替的圖像并不是最精確的。
An organic compound containing many double bonds 多烯一種包含許多雙鍵的有機化合物
Depending upon reaction conditions, the product may be a polyketone formed b y addition polymerization of the ketene double bond . 隨著反應條件的不同，產物可以是由烯酮的雙鍵加成聚合得到的聚酮。
In cases of doubt the changes following hydrogenation, bromination or other chemical attack upon the double bond can be studied . 在有疑問時可以研究雙鍵的氫化，溴化或其他化學反應所引起的變化。

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double bond

double bond 【化學】雙鍵。

double cover

There is alkenyl double bond in the molecular structure and can form linear homopolymer and all kinds of copolymers by various polymerization reaction 該分子結構中含有烯基雙鍵，可以通過各種聚合反應，形成線性均聚物和各種共聚物。

Hydroformylation of the olefinic double bonds was n atom economic method th introduce new functional group in the oil compounds 而通過雙鍵的氫甲酰化反應引入新官能團能為油脂的化工利用提供了一條廣闊的道路。

Lyase an enzyme that catalyzes the separation of two parts of a molecule with the formation of a double bond in one of them 裂解酶：一類能催化一個分子的兩部分分離，并在其中一個上形成雙鍵的酶。

The symmetric structure of oxalic acid molecule and two carboxylic group on both ends ensure the stableness of c = c double bond 草酸分子屬于對稱結構，兩端的羧基使兩個碳原子穩定化。

But that picture of alternating single and double bonds is not the most accurate way of viewing any of these molecules 不過對這些分子來說，這種單雙鍵交替的圖像并不是最精確的。

An organic compound containing many double bonds 多烯一種包含許多雙鍵的有機化合物

Depending upon reaction conditions, the product may be a polyketone formed b y addition polymerization of the ketene double bond . 隨著反應條件的不同，產物可以是由烯酮的雙鍵加成聚合得到的聚酮。

In cases of doubt the changes following hydrogenation, bromination or other chemical attack upon the double bond can be studied . 在有疑問時可以研究雙鍵的氫化，溴化或其他化學反應所引起的變化。