C_nD_m~-簇离子的结构特性和形成动力学研究

对较小碳原子簇负离子Ｃ－ｎ结构的研究是从直链向单环乃至双环构型发展的．氢原子在碳原子簇中起着电子给予体的作用［１，２］．但以往的研究未发现碳原子数的奇偶性和氢原子数目对簇离子构型的影响．我们以激光溅射氘代蒽样品，产生了丰富的碳／氢团簇负离子ＣｎＤ－ｍ..

Structural Recombination of Polymethylsilicone Induced by Laser Plasma

[中文文摘]将脉冲激光束在惰性气氛中溅射石墨产生的等离子体,与一维链状聚甲基硅氧烷的蒸气束流反应 ,在产物中通过真空升华和重结晶分离出了两种单晶,经X射线衍射测定为具有 (CH3SiO1.5) n(n =8,10 )组成的硅氧烷,它们均具有多面体的三维笼状构型 .通过色 -质联用还检测到其它硅氧烷化合物,其中某些产物已表征为二维多环的构型.反应结果表明,经由激光等离子体的碰撞和能量传递,反应物的链状结构发生解离和进一步反应,经结构重组形成了多种不同组成和构型的产物。[英文文摘]A special synthetic reaction has been developed, in which vapor of the reactant interacts with the high temperature plasma generated by laser ablating a graphite target. By selecting chained methylsilicone as reactant, a series of methylsilsesquioxanes products with various structural configurations have been obtained. Among them, two products, which were separated by sublimation in high vacuum and recrystalization, were characterized by X-ray crystal diffraction as (CH_3SiO_ 1.5)_n (n=8,10). Both of them are found to have three-dimensional cage structure.In addition,other products with double ring structure were detected by GC-MS analysis.The results demonstrate the potential application of the synthetic reaction.In the reaction described in this article,resulting from the collision and energy-transfer of the laser plasma,chain structure of the reactant dissociated and recombined to give the cage and ring structure of the product.国家自然科学基金重大项目(29890210)资助课

Size spectrum of benthic fauna in Zhanjiang Gaoqiao Mangrove Wetlands,China

在我国,红树林湿地底栖动物粒径谱研究很少。根据2010年1月、4月、7月、10月在湛江高桥红树林湿地获得的大型和小型底栖动物数据,构建了底栖动物生物量粒径谱,以期为湛江高桥红树林湿地的生态保护和持续利用提供科学依据。主要研究结果如下:(1)高桥红树林湿地生物量粒径谱基本为3峰模式。第一峰在-2粒级,主要由线虫构成;第二峰在4—12粒级,主要由寡毛类、多毛类和小个体甲壳类构成;第三峰在13—22粒级,主要由大个体腹足类、双壳类和甲壳类构成。(2)木榄、桐花树和无瓣海桑生境在0—4粒级之间出现一个明显的波谷,这个波谷介于线虫和寡毛类之间,是大型与小型底栖动物粒级交汇区。(3)高桥红树林湿地底栖动物正态化生物量粒径谱的斜率大于-1,截距为16.533—18.150。桐花树(AEgICErAS COrnICulATuM)和无瓣海桑(SOnnErATIA APETAlA)生境的截距、最小粒级的生物量(bMS)高于木榄(bruguIErA gyMnOrrHIzA)和盐地鼠尾粟(SPOrObOluS VIrgInICuS)生境,说明桐花树和无瓣海桑生境的底栖动物生产力水平较木榄和盐地鼠尾粟生境的高;秋季的截距、bMS较其他季节高,说明秋季的底栖动物生产力水平较其他季节高。The biomass size spectrum( BSS) theory was introduced by Sheldon et al.in 1972 to describe the features of marine pelagic ecosystems.Schwinghamer was the first to extend this concept to benthic assemblages.Traditionally,benthic communities are described by structural variables,such as abundance,species composition,and biodiversity indices.Analysis of the distribution of biomass by size is an ataxonomic approach to studying the structures and functions of the benthic communities.The introduction of the BSS theory provides a new method for benthic ecology research.Compared to taxonomic approaches for studying the structures and functions of benthic communities,the BSS theory is easier to operate,in which calculation errors caused by inaccurate taxonomic identification may be avoided.Because of the urgent need to understand the structures and functions of marine ecosystems,and to accurately detect the ecological systems,the fields of application for the BSS theory will become more extensive.In China,most studies on the size spectrum of zoobenthos have been conducted in the subtidal zone,with only a few studies having been conducted in the intertidal zone.In addition,no studies have been conducted in mangrove swamps.To provide a scientific basis for the ecological protection and sustainableuse of the Gaoqiao Mangrove Wetlands,the BSS of the benthic fauna in this area was constructed from macrofaunal and meiofaunal samples collected in January,April,July,and October 2010.The main results showed that the BSS of the benthic fauna in Gaoqiao Mangrove Wetlands exhibits 3 peaks.The first peak appeared at a grain size of- 2,and comprised nematodes.The second peak appeared at grain sizes of 4—12,and comprised oligochaetes,polychaetes,and small-bodied crustaceans.The third peak appeared at grain sizes of 13—22,and comprised large-bodied gastropods,bivalves,and crustaceans.For Aegiceras corniculatum,Sonneratia apetala and Bruguiera gymnorrhiza biotopes,there was a trough at grain sizes 0—4,which was the intersection grain size between macrofauna and meiofauna.The slope values of the normalized biomass size spectra( NBSS) were greater than- 1,while the intercepts ranged from 16.533 to 18.150.The intercepts and the biomass of minimum size( BMS) for A.corniculatum and S.apetala biotopes were higher than those in B.gymnorrhiza and Sporobolus virginicus biotopes.This result indicated that zoobenthic productivity in the A.corniculatum,and S.apetala biotopes were higher than that in the B.gymnorrhiza and S.virginicus biotopes.The intercept and BMS in fall were higher than those in other seasons,indicating that zoobenthic productivity was higher in fall compared to the other seasons.国家自然科学基金(41176089;41376113

Structural recombination of polymethylsilicone induced by laser plasma

A special synthetic reaction has been developed, in which vapor of the reactant interacts with the high temperature plasma generated by laser ablating a graphite target. By selecting chained methylsilicone as reactant, a series of methylsilsesquioxanes products with various structural configurations have been obtained. Among them, two products, which were separated by sublimation in high vacuum and recrystalization, were characterized by X - ray crystal diffraction as (CH3SiO1.5)(n)(n = 8, 10). Both of them are found to have three - dimensional cage structure. In addition, other products with double ring structure were detected by GC - MS analysis. The results demonstrate the potential application of the synthetic reaction. In the reaction described in this article, resulting from the collision and energy - transfer of the laser plasma, chain structure of the reactant dissociated and recombined to give the cage and ring structure of the products

Synthesis of Perchlorinated Polycyclic Aromatic Hydrocarbon by Laser Ablation

[中文文摘]受Ｋｒａｔｓｃｈｅｒ等［１］电弧法合成Ｃ６０工作的启发,本课题组近年来以独创的液相电弧、微波放电等方法，合成了Ｃ５０及其多种全氯代碎片［２－５］．本文通过我们最近发展的脉冲激光溅射方法在四氯化碳的蒸汽中溅射石墨，得到丰富的克量级产物．这些产物经ＨＰＬＣ－ＵＶ－ＭＳ联用技术，表征为全氯代多环芳烃．其中部分物质含有五元环，可以看作是富勒烯形成过程中产生的全氯代碎片，该研究结果不仅有助于了解富勒烯的形成机理，而且展示了激光溅射合成法应用前景．[英文文摘]By laser ablating graphite in the vapor of tetrachloromethane,a series of perchlorinated polycyclic aromatic hydrocarbons were synthesized.Among them, hexachlorobenzene (C6Cl6), octachloronaphthalene (C10Cl8), octachloroacenaphthylene (C12Cl8), decachloroanthracene (C14Cl10), decachlorophenanthrene (C14Cl10 ), decachloropyrene (C16Cl10 ), decachlorofluoranthene (C16Cl10),C18Cl10, C20Cl10,C22Cl12 and C24Cl12 were identified by HPLC-UV-MS.The results demonstrate the potential of the reaction for synthesizing the compounds with special structures.国家自然科学基金(批准号:29890210

Structural Features and Formation Kinetics of C\-\%n\%D\+-\-\%m\% Cluster Ions

对较小碳原子簇负离子C-n结构的研究是从直链向单环乃至双环构型发展的.氢原子在碳原子簇中起着电子给予体的作用［1，2］.但以往的研究未发现碳原子数的奇偶性和氢原子数目对簇离子构型的影响.我们以激光溅射氘代蒽样品，产生了丰富的碳/氢团簇负离子Cnd-M...By laser ablating of anthracene\|\%d\%\-\{10\} sample, various C\-\%n\%D\+-\-\%m\% and C\+-\-\%n\% cluster anions were generated.The distribution suggests that the structural configuration and stability of the clusters varied with the number of deuterium atoms and the parity of number of carbons.With growing size of the clusters, their structural configuration changes from chain to monocycle, and further to polycycle.The analysis of the distribution also reveals the formation kinetics of the clusters.\=国家杰出青年科学基

基于Visual Basic的无级变速器脉动发生机构的运动仿真

利用Visual Basic面向对象以及包含协助开发环境的事件驱动为机制的可视化程序设计的特点,进行无级变速器脉动发生机构的运动仿真。从运动仿真中对脉动式无级变速器的机构性能进行研究。已探讨出了一种四边形的高效率脉动发生机构

Synthesis of perchlorinated polycyclic aromatic hydrocarbon by laser ablation

By laser ablating graphite in the vapor of tetrachloromethane, a series of perchlorinated polycyclic aromatic hydrocarbons were synthesized. Among them, hexachlorobenzene (C-6 Cl-6), octachloronaphthalene (C-10 Cl-8), octachloroacenaphthylene (C-12 Cl-8), decachloroanthracene (C-14 Cl-10), decachlorophenanthrene (C-14 Cl-10), decachloropyrene (C-16 Cl-10), decachlorofluoranthene (C-16 Cl-10), C-18 Cl-10 , C-20 Cl-10 , C22Cl12 and C-24 Cl-12 were identified by HPLC-UV-MS. The results demonstrate the potential of the reaction for synthesizing the compounds with special structures

Structural features and formation kinetics of CnDm- cluster ions

By laser ablating of anthracene-d(10) sample, various CnDm- and C-n(-) cluster anions were generated. The distribution suggests that the structural configuration and stability of the clusters varied with the number of deuterium atoms and the parity of number of carbons. With growing size of the clusters, their structural configuration changes from chain to monocycle, and further to polycycle. The analysis of the distribution also reveals the formation kinetics of the clusters

富含玉米黄质色素橄榄油对高血脂小鼠的影响Effect of olive oil rich in zeaxanthin on hyperlipidemia mice

旨在为开发富含玉米黄质色素橄榄油（ZT）保健产品提供参考，用脂肪乳剂灌胃构建高血脂小鼠模型，同时设生理盐水对照（CK）组，将建模成功的小鼠随机分为高血脂模型组（Model），ZT高、中、低剂量处理组和菲勒贝特药物对照（PL）组，连续灌胃给药28 d， 研究ZT（玉米黄质色素含量400 mg/100 g）对高血脂小鼠空腹血糖（FBG）、糖化血红蛋白（HbAlc）、总胆固醇（TC）、甘油三酯（TG）、高密度脂蛋白 （HDL）、低密度脂蛋白（LDL）、总胆红素（TBIL）、总胆汁酸（TBA）、丙氨酸氨基转移酶（ALT）、天门冬酸氨基转移酶（AST）、γ-氨酰基转移酶（GGT）、碱性磷酸酶（ALP）等指标的影响，并对ZT小鼠开展急、慢性毒理研究。结果表明：ZT能有效降低高血脂小鼠的FBG、HbAlc、TC、TG、LDL、TBIL、TBA含量，升高HDL含量，对ALT、AST、GGT和ALP活性具有很好的抑制作用，能够显著改善血糖、血脂代谢紊乱，降低小鼠体质量，对正常小鼠无急、慢性毒理作用，可提高小鼠血清中超氧化物歧化酶（SOD）、过氧化氢酶（CAT）和谷胱甘肽过氧化物酶（GSH-Px）的活性。综上，富含玉米黄质色素橄榄油属无毒性物质，能提高小鼠的抗氧化能力，降低其体质量，是具有较好辅助降血糖、降血脂作用的橄榄油保健食品。In order to provide a reference for the development of health care products of olive oil rich in zeaxanthin(ZT), the mice model of hyperlipidemia was established by intragastric administration of lipid emulsion, and the nomal saline group(CK) was set up at the same time. The successfully modeled mice were randomly divided into hyperlipidemia model group (Model), high,middle and low dosages groups of ZT,and Philbert control group(PL). The drug was given by intragastic administration continuously for 28 d to investigate the effects of ZT(zeaxanthin content 400 mg/100 g) on fasting blood glucose (FBG), glycated hemoglobin (HbAlc), total cholesterol (TC), triglyceride (TG), high-density lipoprotein (HDL), low-density lipoprotein (LDL), total bilirubin (TBIL), total bile acid (TBA), alanine aminotransferase (ALT), aspartate aminotransferase (AST), gamma-ammonia acyltransferase (GGT) and alkaline phosphatase (ALP) in hyperlipemia mice, and acute and chronic toxicological studies on ZT mice were carried out. The results showed that ZT could effectively decrease the contents of FBG, HbAlc, TC, TG, LDL, TBIL, TBA, increase the content of HDL, and inhibit the activities of ALT, AST, GGT and ALP. It could significantly improve the metabolic disorder of blood glucose and lipid, and reduce the body weight of mice. It had no acute or chronic toxicity to normal mice. It could increase the activities of SOD, CAT and GSH-Px in serum of mice. Therefore, olive oil rich in zeaxanthin is a non-toxic substance, which can improve the antioxidant capacity and reduce the body weight of mice, and it is an olive oil health-care food with good auxiliary blood glucose reduction and blood lipid reduction effects