Nucleohistone dissociation by ganglioside micelles

The sialic acid-containing glycosphingolipids known as gangliosides can reverse the heat stabilization of DNA by histones. The ability of pure mono-and disialogangliosides to dissociate reconstituted nucleohistone is directly dependent on their sialic acid content; they are effective in concenitrations above their critical micelle concentration.     

反胶束技术及其应用

反胶束是表面活性剂是非极性溶剂中形成的与正常胶束结构相反的含水聚合体。反胶束技术可用于非极性体系中极性物质的分离，也可用于酶的固定化，目前主要用于生物大分子物质的分离，是一种新型的生物分离技术。就该技术的原理、方法、应用及最新研究进展进行了介质。     

Non-centrosymmetric cylindrical micelles by unidirectional growth

Although solution self-assembly of block copolymers (BCPs) represents one of the most promising approaches to the creation of nanoparticles from soft matter, the formation of non-centrosymmetric nanostructures with shape anisotropy remains a major challenge. Through a combination of crystallization-driven self-assembly of crystalline-coil BCPs in solution and selective micelle corona cross-linking, we have created short (about 130 nanometers), monodisperse cylindrical seed micelles that grow unidirectionally. These nanostructures grow to form long, non-centrosymmetric cylindrical A-B and A-B-C block co-micelles upon the addition of further BCPs. We also illustrate the formation of amphiphilic cylindrical A-B-C block co-micelles, which spontaneously self-assemble into hierarchical star-shaped supermicelle architectures with a diameter of about 3 micrometers. The method described enables the rational creation of non-centrosymmetric, high aspect ratio, colloidally stable core-shell nanoparticles in a manner that until now has been restricted to the biological domain.     

Biosynthesis of rubber

The problem of how rubber is synthesized in the plant has been divided into two portions: (i) the nature of the monomer used and how this monomer is synthesized, and (ii) the nature of the polymerization reaction by which the monomer is transformed to rubber. With respect to the first, the monomer appears to be the 5-carbon branched-chain compound beta-methylcrotonic acid or a derivative thereof. This substance is synthesized in the plant from acetyl-coA. With respect to the second, no information is available, since polymerization of the 5-carbon monomer units to polymers has not yet been achieved outside the living plant.     

橡胶加工分析仪用于天然橡胶质量监测

1前言 天然橡胶的年消费量比任一种合成橡胶都多。但是，这种天然产品的质量受很多因素的影响，而这蝗因素与合成橡胶的生产无关。例如产胶乳橡胶树的品系、树龄以及土壤和气候条件都会影响天然橡胶的质量。天然橡胶的分子量呈双峰或单峰分布，其分子量分布有三种类型。A型的分布为明显的双峰曲线，分子量较小的峰值几乎与分子鼍较大的峰值相等；B型也是双峰分布，分子量较小的峰值为分子鼍较大的峰值的一半或更小；C型为不对称的单峰分布。     

反胶束萃取植物血凝素前萃工艺研究

为了建立植物血凝素(PHA)的最佳反胶束萃取工艺;根据单因素考察结果,采用正交试验法对花菜豆中植物血凝素(PHA)的提取工艺进行研究.结果表明,琥珀酸二辛脂磺酸钠(AOT)浓度是主要影响因素,其次为萃取时间和NaCl浓度;最佳前萃取条件AOT浓度为0.05 g·mL-1,NaCl浓度为0.10mol·L-1,搅拌提取5...     

骡的巨细胞瘤研究

对１例罕见的骡良性骨外巨细胞瘤进行了眼观和光镜检查。巨细胞瘤位于左侧下颌部皮下，与筋膜有联系，呈卵圆形。巨细胞瘤由多核巨细胞和单核基质细胞组成，间质富有血管；多核巨细胞，多呈圆形，直径２８～９０μｍ，胞核５～６个至４０个以上，多聚集于细胞中央，呈圆形或椭圆形，核膜清楚，染色质稀少，散在分布，核仁明显；基质细胞呈梭形，细胞界限不清，胞核为梭形或椭圆形，染色和结构与巨细胞的胞核相似。对巨细胞瘤的病理形态学和发病学的一些问题进行了讨论。     

Giant supramolecular liquid crystal lattice

Self-organized supramolecular organic nanostructures have potential applications that include molecular electronics, photonics, and precursors for nanoporous catalysts. Accordingly, understanding how self-assembly is controlled by molecular architecture will enable the design of increasingly complex structures. We report a liquid crystal (LC) phase with a tetragonal three-dimensional unit cell containing 30 globular supramolecular dendrimers, each of which is self-assembled from 12 dendron (tree-like) molecules, for the compounds described here. The present structure is one of the most complex LC phases yet discovered. A model explaining how spatial arrangement of self-assembled dendritic aggregates depends on molecular architecture and temperature is proposed.     

大鲵苗种驯养试验

2005~2007年分批引进大鲵苗种进行驯养试验,结果:苗种驯养成活率平均达到70.8%,养殖规格达到23~650 g,收到了较好效果。     

反胶束体系的光密度与酶活性测定

以正庚烷-正丁醇-大豆卵磷脂配制反胶束,做了增溶不同量Tris—HCl缓冲液的试验．结果表明：增溶不同水量的反胶束体系稳定性不一样,每3mL增溶40-90μL缓冲液的反胶柬体系光密度在0—300s内不断变化,透明澄清的稳定反胶束体系分布在每3mL增溶0～40μL及90～130μL2个区间．增溶水量较少时,反胶束增溶含蛋白质与不含蛋白质水相的体系之间存在差别．在水-正庚烷-正丁醇-大豆卵磷脂反胶束体系中未发现核糖核酸酶A1（RNase A1）的超活性．     

Multicompartment micelles from ABC miktoarm stars in water

By combining three mutually immiscible polymeric components in a mixed-arm star block terpolymer architecture, we have observed the formation of a previously unknown class of multicompartment micelles in dilute aqueous solution. Connection of water-soluble poly(ethylene oxide) and two hydrophobic but immiscible components (a polymeric hydrocarbon and a perfluorinated polyether) at a common junction leads to molecular frustration when dispersed in aqueous solution. The incompatible hydrophobic blocks form cores that are protected from the water by the poly(ethylene oxide) blocks, but both are forced to make contact with the poly(ethylene oxide) by virtue of the chain architecture. The structures that emerge depend on the relative lengths of the blocks and can be tuned from discrete multicompartment micelles to extended wormlike structures with segmented cores.     

国外橡胶补贴政策对海南天然橡胶产业发展的启示

通过文献收集和调研访谈法,梳理总结了国外橡胶主产国的橡胶补贴政策,并调查分析了海南胶农对橡胶良种补贴政策的满意度。从以国际市场为导向,支持和保护天然橡胶价格、提供稳定的经费来源、创新补贴形式等方面提出促进海南省天然橡胶产业发展的对策。     

Translocation in the Giant Kelp Macrocystis

Experiments with C(14)-labeled bicarbonate demonstrate that organic products of photosynthesis are transported through the stipe tissue of Macrocystis. Depending upon conditions, not all of which have been fully ascertained, the direction of transport may be either predominantly apical or toward the base of the plant.