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coil-to-globule transition
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  “coil-to-globule transition”译为未确定词的双语例句
     We started with the folding or coil-to-globule transition of linear poly(N-isopropylacrylamide) (PNIPAM) homopolymer chains in water, and then studied the folding of hydrophilically or hydrophobically modified PNIPAM copolymer chains.
     最初,作者研究了聚(N-异丙基丙烯酰胺)(PNIPAM)均聚物的折叠或叫做“线团-塌缩球的转变”,然后研究了含有疏水和亲水基团的PNIPAM共聚物的折叠。
短句来源
     The coil-to-globule transition temperature T_C,estimated from the location of the peak on the heat capacity,depended on the chain length and was almost sequence independent.
     还研究了不同折叠序列在不同链长时的比热情况,发现其相转变温度TC主要与链长有关,与折叠序列无关.
短句来源
  相似匹配句对
     The Solvation and Desolvation Process in the Course of Coil-globule Transition of Aqueous Poly( N-isopropylacrylamide) Solution
     聚N-异丙基丙烯酰胺水溶液在线团-球体转变过程中的溶剂化-去溶剂化效应
短句来源
     Coil-globule transition has been reproduced in E-protein under a completely aqueous or lipid environment.
     模拟再现了蛋白质的 coil-globule转变 ,验证了蛋白质序列分布的重要性 .
短句来源
     This process corresponding to the conformation transition of PNIPAM, namely, transition between a coil conformation and a globule conformation.
     这个过程对应着PNIPAM分子链从伸展的无规线团构象转变到塌缩的小球构象。 而在降温过程中(40℃到20℃),微悬臂梁发生了相反方向的变形,这对应这PNIPAM分子链构象的恢复。
短句来源
     THE EFFECTS OF THE IODINE DENSITY ON COIL CENTRAL TRANSITION FREQUENCIES
     碘密度对COIL激光频率的影响
短句来源
     The coil-to-globule transition temperature T_C,estimated from the location of the peak on the heat capacity,depended on the chain length and was almost sequence independent.
     还研究了不同折叠序列在不同链长时的比热情况,发现其相转变温度TC主要与链长有关,与折叠序列无关.
短句来源
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  coil-to-globule transition
The properties of the coil-to-globule transition were presented and compared with other theoretical predictions and simulation results.
      
When a small amount of polymer was adsorbed the coil-to-globule transition at the θ temperature did not occur.
      
Swelling minima are connected with the coil-to-globule transition of network chains and their characteristic parameters-concentration of ethanol at the minimum, ceth,m, and corresponding swelling degree, Qm, were determined.
      
The strongest repulsion is predicted at the coil-to-globule transition point Tcg: the repulsion force decreases with the distance between the surfaces according to a power law.
      
A first-order coil-to-globule transition is predicted at some T = Tcg.
      
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Narrowly distributed spherical microgel particles of poly(N isopropylacrylamide) (PNIPAM) were prepared by emulsion polymerization in water.The volume phase transition of the microgel particles was studied by static and dynamic laser light scattering.The results were compared with the coil to globule transition of individual long linear PNIPAM chains.The microgel particles have a higher transition temperature,but a less sharp phase transition in comparison with that of long linear...

Narrowly distributed spherical microgel particles of poly(N isopropylacrylamide) (PNIPAM) were prepared by emulsion polymerization in water.The volume phase transition of the microgel particles was studied by static and dynamic laser light scattering.The results were compared with the coil to globule transition of individual long linear PNIPAM chains.The microgel particles have a higher transition temperature,but a less sharp phase transition in comparison with that of long linear chains.This difference has been attributed to both the short length and the broad length distribution of the subchains inside the microgels.A combination of static and dynamic laser light scattering results revealed that even in a highly collapsed state the microgel particles retained ~70% of water and the density of the microgel networks increased from 0 021 g/ml to ~0 3 g/ml during the phase transition.The phase transition of the microgel particles is continuous,in contrast to the discontinuous volume phase transition in bulk PNIPAM gels.The microgel particles are thermodynamically stable even at their collapsing limit.The behavior of microgel particles is compared with that of individual PNIPAM chains.

窄分散的聚(N异丙基丙烯酰胺)水凝胶微球用乳液聚合方法制备,并用动态和静态光散射对其体积相变进行了研究.与水中聚(N异丙基丙烯酰胺)线性单链比较,水中凝胶微球的体积相变温度较高,对温度的响应比较平缓.相变是连续的,有别于大块凝胶非连续的体积变化.在体积相变过程中,凝胶微球始终是密度均一的热力学稳定球体.从相变过程网络密度的变化可以确定,绝大部分的水在收缩过程被排了出来,但在紧缩的凝胶微球中仍含有约70%的水.

Using a combination of static and dynamic light scattering,we systematically studied the coil to globule and globule to coil transitions of a single linear poly( N isopropylacrylamide)(PNIPAM) chain and the volume change of spherical PNIPAM microgels in water.We made,for the first time,the conformation change of individual homopolymer chains from a coil to a fully collapsed stable single chain globule and confirmed the existence of the crumpled coil and the molten globule states between the random...

Using a combination of static and dynamic light scattering,we systematically studied the coil to globule and globule to coil transitions of a single linear poly( N isopropylacrylamide)(PNIPAM) chain and the volume change of spherical PNIPAM microgels in water.We made,for the first time,the conformation change of individual homopolymer chains from a coil to a fully collapsed stable single chain globule and confirmed the existence of the crumpled coil and the molten globule states between the random coil and the fully collapsed globular states.The study of the coil to globule transition kinetics rejects the previously suggested high chain knotting density inside the globule.Our result also indicated that even in its fully collapsed state,the globule and the microgel particle still contain 66% and 70% water,respectively.The study of interaction between the PNIPAM microgel and surfactant suggested a new swelling and shinking mechanism different from the previously proposed hydrophobic interaction.Moreover,our NMR results showed,for the first time,that surfactant molecules are able to form micelles in presence of the gel network even the surfactant concentration is much lower than its critical micelle concentration.A comparison of the phase transitions of the linear chains and microgels revealed that previously observed discontinuous volume change in bulk PNIPAM gels is due to the imbalance between the bulk shear module and the internal stress originated from the inhomogeneous shrinking,which is different from the theoretically predicted discontinuous volume phase transition.

(接上期)2聚(N-异丙基丙烯酰胺)微凝胶在水中的体积相变2.1理论部分凝胶体积相变热力学:聚合物凝胶的溶胀和蜷缩可以用膨胀因子α=(V/V0)1/3=(ΦT/ΦΘ)1/3来表征,其中ΦΘ的ΦT分别是温度Θ和T下凝胶网络的体积分数。在平均场理论中,中...

Theoretical study on the structure of hydrogen bond was carried out by using density functional theory. Geometries were optimized at B3LYP/6 31G * and single point calculations were performed at B3LYP/6 31+G * level. Stabilization energy was obtained by taking basis set superposition error correction into account. After the investigation of various minimum energy geometries, single ring structures of water pentamer and water hexamer were found most stable in liquid water. The calculations show that these...

Theoretical study on the structure of hydrogen bond was carried out by using density functional theory. Geometries were optimized at B3LYP/6 31G * and single point calculations were performed at B3LYP/6 31+G * level. Stabilization energy was obtained by taking basis set superposition error correction into account. After the investigation of various minimum energy geometries, single ring structures of water pentamer and water hexamer were found most stable in liquid water. The calculations show that these single ring structures have no imaginary frequency. Adding the methanol molecules to the ring like water cluster, geometries of water methanol complexes were optimized. No imaginary frequencies were found in these structures. A significant and novel feature revealed firstly in this work is the perfect double hydrogen bond between methanol molecules and the ring like water complexes. In water and methanol solvent, the polymer chain, PNIPAM, can form hydrogen bond with solvent molecules. It can stretch to coil shape and be soluble. But when the two solvents are mixed, water and methanol molecules will form stable comlexes because of strong double hydrogen bonding. The active point of hydrogen bonds of mixed solvent will be shielded; and the solvent becomes non polar. So, the polymer chain will overlap immediately because of the formation of intra molecular hydrogen bonds and consequently perform a coil to globule transition.

用密度泛函理论对水和甲醇混合溶剂体系的氢键结构进行了详细研究 .通过构象和频率分析发现在水团簇中五聚体和六聚体环状结构最为稳定 ,同时发现一个全新的特征 ,即甲醇分子能与水五聚体和六聚体形成双氢键 .根据各相互作用的稳定化能 ,分析了水和甲醇混合溶剂对 PNIPAM溶解能力的影响 ,并对实验现象给予了合理解释

 
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