Constitutional repeating unit 重復(fù)結(jié)構(gòu)單元
A polymer in which the repeating unit contains two carbon atoms linked by an oxygen atom 聚醚一種聚合物,其中重復(fù)性的單位含有由一個(gè)氧原子連結(jié)的兩個(gè)碳原子
The length of the polymer chain is specified by the number of repeat units in the chain . this is called the degree of polymerization 聚合物鏈的長度可以用鏈中重復(fù)單元數(shù)來表示,叫做聚合度。
In order to facilitate the analysis of the minimum repeated unit cell , the following geometrical characteristics were assumed : ( a ) all the yarn segments parallel to a diagonal direction or braiding axis in all unit cells lying in the same layer of the perform are treated as forming inclined lamina or horizontal lamina after matrix impregnation , ( b ) fibers were considered to be straight and unidirectional 以精確的復(fù)合材料單胞模型為基礎(chǔ),從最小的可重復(fù)的單胞入手,對(duì)單胞的結(jié)構(gòu)進(jìn)行簡化分析,認(rèn)為纖維是平直的,將單胞中的四個(gè)不同方向的纖維束看成是空間四個(gè)不同方向的單向復(fù)合材料,纖維束的性能可以等價(jià)于單向復(fù)合材料的宏觀性能。
Its and 5 . 8s rrna genes of 4 species in the cardamine were sequenced . sequences of all species are complete in the useful segments and the results of the two - way sequencing are complementary sequences , which indicates that the evolution of its repeating units of those species had synchronized with a high degree ) 4種植物的核糖體dna中的內(nèi)轉(zhuǎn)錄間隔區(qū)( its )序列及5 . 85 : rna基因全序列,在有效的區(qū)段內(nèi),序列數(shù)據(jù)完整無缺,且正、反向測序結(jié)果完全互補(bǔ),這表明所用材料的its重復(fù)單位同步進(jìn)化程度很高。
The result of analysis indicated that hpa was few divarication structure , and the ( 1 - 4 ) glc were the corn structure of the main chain , and ( 1 - 4 ) glc had a divarication at the point of 0 - 3 , there was a divarication in every eight unit , the divarication was made of single deoxidized glc , and its repeat units were possiblely : hpb was also few divarication structure , and the a - ( l - 4 ) glc were the com structure of the main chain , ( 1 - 4 ) glc had a divarication at the point of 0 - 3 , there was a divarication in every seven unit , the divarication was made of non - single deoxidized glc , and its repeat units were possiblely : g represents deformity of glucose valueofnl : 317 value of n2 : 251 分析結(jié)果表明: hpa為少分枝結(jié)構(gòu):其中( 1 4 ) glc構(gòu)成主鏈的核心結(jié)構(gòu); ( 1 4 ) glc在3 - 0處有分枝,平均每8個(gè)己糖殘基有1個(gè)分枝;支鏈部分由單一非還原端glc構(gòu)成;其重復(fù)單位可能為: hpb為少分枝結(jié)構(gòu);其中( 1 4 ) glc構(gòu)成主鏈的核心結(jié)構(gòu); ( 1 4 ) glc在0 - 3處有分枝,平均每7個(gè)己糖殘基有1個(gè)分枝;支鏈部分由單一非還原端glc構(gòu)成;其重復(fù)結(jié)構(gòu)單位可能為: g代表葡萄糖殘基n1值為: 317n2值為: 251
[ objective ] heparin is linear polysaccharides consisting of repeating disaccharide unit backbones of n - acetyl - d - glucosamine that is linked to d - glucuronic acid . the disaccharide repeat unit can be modified to include n - and o - sulfation ( 6 - o and 3 - o sulfation of the glucosamine and 2 - o sulfation of the uronic acid ) . these specific sulfate patterns are involved in the interaction of heparin with other molecules [目的]肝素是由n -乙酰葡萄糖胺與d -葡萄糖醛酸以1 4糖苷鍵連接起來的重復(fù)二糖單位組成的線性多糖,葡萄糖胺可帶有n -硫酸基團(tuán),可在c6上形成0 -硫酸酯,帶有硫酸基團(tuán)的獨(dú)特結(jié)構(gòu)參與了肝素與其他分子的相互作用。
百科解釋
An essential concept which defines polymer structure, the repeat unit or repeating unit is a part of a polymer chain whose repetition would produce the complete polymer (except for the ends) by linking the repeat units together successively along the chain, like the beads of a necklace.Rudin p.