膽甾基 的英文怎麼說
中文拼音 [dǎnzāijī]
膽甾基
英文
cholesteryl-
Abstract : methanesulfonic acid method was used to prepare five acylated chitins. except heptanoyl chitin, four of them, i. e. acetyl chitin, propionyl chitin, butyryl chitin and hexanoyl chitin, had high degree of substitution ( from 1. 5 to 2. 0 ) and exhibited lyotropic liquid crystalline behavior and cholesteric phase. as the length of the side chain increased the critical concentration ( w / w ) somewhat increased from 0. 21 to 0. 26 because the chain rigidity dropped. the critical concentration values of all the four derivatives were much higher than that of chitin ( 0. 12 ) due to the decrease of intramolecular hydrogen bonds. the four acylated chitin can form typical banded texture after being sheared. there minimum concentrations to form banded texture of them were evidently different, varied from 0. 25 ( for acetyl chitin ) to 0. 37 ( for hexanoyl chitin ). these results further indicated that liquid crystallinity decreased while the length of flexible side substituents increased
文摘:四種羧酰化甲殼素即乙酰化、丙酰化、丁酰化和己酰化甲殼素在二氯乙酸溶液中均呈現膽甾型溶致液晶相.臨界濃度隨側基長度增加而略有增加，衍生物的臨界濃度明顯都比原甲殼素高許多，這些規律都可以用鏈剛性的變化來解釋.四種羧酰化甲殼素在剪切時均能形成條帶織構，而且能形成條帶織構的最低濃度有明顯差別，隨側基長度增加而提高，進一步表明側基較長，液晶性減少Udp - glucuronosyltransferases ( ugts ) are glycoproteins localized in the endoplasmic reticulum that catalyze the conjugation of a broad variety of endogenous and exogenous lipophilic aglycon substrates ( such as bilirubin, steroid hormone and drugs, insecticide, etc ) with glucuronic acid using udp - glucuronic acid ( udpga ) as the sugar donor. ugts are a gene superfamily of phase ii drug - metabolizing enzymes, they are responsible for the glucuronidation of a significant number of different functional groups ( e. g
Ugts能催化各種各樣外源和內源的親脂性糖苷配基底物與葡醛酸的結合，該反應是機體清除外源性（如藥物和殺蟲劑）和內源性（如膽紅素和甾體激素）親脂性化合物的一個主要方式，也是藥物相代謝的重要方式。A super acylation catalyst, 4 - dimethylamino pyridine ( dmap ), was prepared and used to synthesize cholesteryl ester compounds. four kinds of cholesteryl ester compounds such as cholesteryl p - alkoxyl benzoate, cholesteryl dicarboxylate, cholesteryl lumequeic ester and coattail - like cholesteryl ester were synthesized by acylation method and super acylation catalyst method. chemical structures and liquid crystal behaviors of the synthesized samples have been characterized by using element analysis, ftir, dsc and polarized microscopy with a hot stage
本文合成了高效酰化催化劑4 -二甲基氨基吡啶（ 4 - dimethylaminopyridine ， dmap ） ，採用酰氯化法和高效酰化催化劑法分別合成了對烷氧基苯甲酸膽甾醇酯、對稱脂族二羧酸膽甾醇酯、烯酸膽甾醇酯及燕尾型膽甾醇酯四類膽甾醇酯衍生物，並進行了化學結構和液晶性能的表徵。Synthesis and mesomorphism of disubstituted pyridazines containing cholesteryl
含膽甾基的雙取代噠嗪的合成和介晶性At present, the planar structure of clc can be acquired by two methods. one is treating the panel of lc cell by orienting and rubbing, the other is by forming polymer net in the lc. the both method can be used at the same time
目前，膽甾相液晶平面排態的獲得主要有兩種方法:一是通過對液晶盒的兩個基板表面進行取向摩擦;二是通過在膽甾相液晶中形成聚合物網路;當然也有二者兼用的。Here we show that 27 - hydroxycholesterol ( 27hc ), an abundant cholesterol metabolite that is elevated with hypercholesterolemia and found in atherosclerotic lesions, is a competitive antagonist of estrogen receptor action in the vasculature
在此我們發現27 -羥基膽甾醇（ 27hc ）是一種含量豐富的膽固醇代謝產物，它的過量引起高膽固醇血癥並存於粥樣硬化病變中，在血管中是雌激素受體競爭性拮抗劑。The results show the relative reactivities of three second hydroxyl groups on steroids skeleton of methyl cholicate are different to the three kinds of acylating agents
結果顯示，與三種活性不同的酰化試劑作用時，膽酸甲酯分子甾體骨架上三個仲羥基的相對反應活性不同。But there ' s another compound in the blood ? 27 - hydroxycholesterol, or 27hc ? that can also attach to the same receptors but doesn ' t trigger the protective benefits for the heart, according to a study of mice published yesterday in nature medicine
昨天在自然醫學雜志上發表的對鼠的一項研究表明血液中存在另一種化合物- 27 -羥基膽甾醇，或27hc -它同樣能夠和相同的受體結合而不觸發對心臟的保護作用。分享友人