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side chain 【化學】側鏈。

side check

Side chain polyurethanes with azo group are characterized and confirmed by ftir , uv - vis , dsc , vpo , z - scan , polarize microscope . the results show that the end - group and the flexibility of main chain affects the growing up of liquid crystalline phase greatly . because the determinable way of detection is defective , it was not founded the liquid crystalline behavior obviously contributes to the non1inear optical thection 最后,在分析討論實驗結果的基礎上,指出側鏈型聚氨酯液晶中側鏈介晶基元的末端基團及主鏈的柔性對其液晶態的形成有重要影響;由于檢測手段的不齊備,未能觀察到熔致型聚氨酯液晶的液晶行為對其非線性光學效應的貢獻作用。

Because the large conformational changes occurring upon complex formation are frequently confined to the protein surface , especially for the side chains of flexible amino acids arg , lys , asp , glu and met , the locations of the mass centers and the values of radii of these residues are modified for modeling protein surface . this tolerates overlap in some degree between the amino acid side chains on the surfaces of the receptor and the ligand 由于蛋白質表面氨基酸殘基arg 、 lys 、 asp 、 glu和met具有較大的柔性,因此,北京工業大學工學博士學位論文一我們對蛋白質分子表面的這五種氨基酸模型作了修正,調整了殘基球心的位置和半徑的數值,使分子表面的氨基酸殘基在對接時具有一定程度的可交疊性。

However , because of the easily delocalized n electrons , they have more significantly different optical properties than common polymers , such as large third - order nonlinear optical susceptibilities , ultrafast optical response time , good chemical and thermal stabilities . the material properties can be improved through the modification of the backbone and side chain thanks to their easily being cut out 例如較大的非線性系數、較快的光學響應速度、良好的化學和熱穩定性;并且結構易于剪裁,可以通過分子設計改變主鏈或側鏈的結構來優化材料的性能;其原料價格低,易于大量制取。

The results indicate that because of the improvement in two aspects mentioned above , the successful probability of the docking prediction is increased from unbound structures . for the case of enzyme trypsin - inhibitor appi , although the large conformational change occurs to the arg 15 side chain of appi upon complex formation , the native - like structure was still found and ranked first 其中,在胰蛋白酶appi復合物結構預測中,盡管抑制劑appi的15號殘基arg側鏈在復合物形成過程中發生了較大的構象變化,但其近天然結構仍然被找到了,并在打分中排在了第一位。

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

Fouriertransformation infro - red microspectroscopy micro - ftir technique was used to investigate the chemical compositions and structures of cutinite , vitrinite and fusinite from jurassic coals in tarim basin at different temperatures . the results show that the chemical structure of cutinite is mainly composed of long aliphatic - side chain with minor amounts of aromatic compounds . vitrinite is mostly composed of aromatic compounds , in addition to large amount of short aliphatic - side chain compounds . whereas fusinite are dominant by aromatic structure . the study indicates that cutinite is one of the best oil source - rocks , with the higher hydrocarbon - generation potential ; vitrinite is one of better gas source - rocks , and has medium hydrocarbon - generating potential ; fusinite has little hydrocarbon - generating potential . in addition , the components of aliphatic structures of cutinite , vitrinite and fusinite decrease , the aromatics are enriched and condensation of aromatic structure increases with increasing the temperature , and along with the rise of temperatures , the intensity of aliphatic structure and heteroatomic compounds decrease obviously , however the aromatic structure changes a little 應用顯微紅外光譜技術,對塔里木盆地侏羅紀煤中有代表性的3種組分角質體鏡質體絲質體在不同熱模擬溫度下的結構組成變化特征進行了研究,結果表明:角質體結構組成中含有較豐富的長鏈脂族結構,而芳香結構和含氧官能團的含量則相對較少與此相反,絲質體結構組成中芳香烴占絕對優勢,而脂族結構含量則很少鏡質體結構組成介于角質體和絲質體之間,含有較多的短鏈脂族結構和芳香結構。

In order to reduce the membrane ' s cost , we prepared the membrane by simultaneous radiation grafting of styrene onto teflon - polytetrafluorethylene films and subsequent sulfonated by the chlorosulfonic acid introducing the activity sulfonic acid grape into the grafting side chains of the polymer films 在實驗中采用高能輻射技術,先將苯乙烯單體接枝到聚四氟乙烯聚合物基體上,后經氯磺酸磺化反應引入磺酸基團,合成了滿足燃料電池性能要求的質子交換膜。

The structure of the polymer precursor affects the mechanism of the dehydrogenization and sulfuration reaction . especially , the side chain of the precursor almost has a decisive effect on the structure of the resulting composite and their electrochemical properties 研究發現采用具有不同側鏈的有機聚合物作為前驅體,脫氫硫化的機理有很大的差別,并影響得到的復合材料的結構,這直接決定了它們作為鋰電池正極材料的電化學性能。

When the graft ratio was high , the hydrophilic side chain was long and the molecular mass of the main chain of the hydrophilic matrix was great , the diffusion of pp - g - peg in pp blends would be poor , and the diffusion coefficient would also be small 接枝率越高、親水性側鏈的長度越長,親基體主鏈摩爾質量越大,接枝共聚物在聚丙烯共混體系中的遷移擴散性能越差,擴散系數越小。

Otsuka chemical employs an electro - organic synthesis which is a method for easily controlling oxidation - reduction reactions and is applied to selective oxidation reactions , unique reductive reaction and special alkylation of aromatic side chains 大冢化學的各種芳香族化合物在精細化工領域內,作為醫藥中間體、農藥中間體和功能性高分子原料,是具有各種各樣用途的化合物。

On the basis of anal zing structure - activity relationship , the key points and solving methods of synthesizing brassinosteroids are introduced from the synthesis of matrix - cycle and introducing side chain 在分析油菜甾醇內酯類植物生長調節劑結構與活性關系的基礎上,從母環的合成和側鏈的引入兩個方面詳細介紹了該類化合物的合成關鍵及解決方法。

Understanding and predicting the rules that govern this complex folding process - - involving the folding of the main backbone and the packing of the molecular side chains of the amino acids - - is one of the central problems of biology 了解蛋白質的折疊和與其它分子的相互作用以及它的功能將可能有利于找到對付人類疾病的藥物或治療方法。

Using the method of “ purpose building “ , a series new monomer - polyoxyalkyene macromer ( pea ) were synthesized by poly - oxyethlene side chains with synthesis technology in macromer 利用較新的大分子單體合成技術,合成出一系列結構確定且具有不同聚氧烷基鏈長度的新型單體? ?聚氧乙烯基單丙烯酸酯pea 。

The results showed that a function of length of the side chain has a dramatic effect on mesophase formation in the porphyrin free base and complex 最后,研究了酚氧基( rcg )中烷基一)碳鏈長度對葉琳及金屬鋅葉琳配合物材料液晶性能的影響。

One of the most important plant plycoproteins is extensin , a structural component of cell walls , in which the side chains are tetrasaccharides of arabinose 伸展蛋白是一種最重要的植物糖蛋白,它是一種細胞壁的組分,其側鏈是阿拉伯四聚糖。

The stacking interactions between near tryptophane molecule s side chains are responsible for the formation of these two kinds of structures 這2種有序結構的形成原因被認為與相鄰色氨酸分子側鏈之間的堆積相互作用有關。

Studies on synthesis and adsorption performance of side chain amino - group dithiocarbamic chelating resin for metalic ions 側鏈型氨基硫代甲酸螯合樹脂的合成及吸附性能的研究

Synchronously dispatches the incoming message to the server - side chain based on the uri embedded in the message 根據嵌入在消息中的uri將傳入的消息同步調度到服務器端鏈。

Asynchronously dispatches the given message to the server - side chain based on the uri embedded in the message 根據嵌入在消息中的uri將給定的消息異步調度到服務器端鏈。