从与港澳的互补关系谈珠江三角洲的旅游特色与旅游开发

本文从回顾珠江三角洲的旅游发展和立足于与香港、澳门间旅游资源、旅游空间和旅游市场的相互补充关系,论述其旅游开发特色和旅游活动的结构层次,旨在树立珠江三角洲地区的旅游形象,与港澳之间形成一个相得而益彰的旅游整体,成为东亚国际旅游区的重要组成部分。     

中国人类学发展史略

人类学作为一门独立学科，形成于十九世纪中期，传入我国则是本世纪的事。对于这门年轻学科在中国由最初传入到九十年代这段不平凡的发展历程，想必人们还相当缺乏了解。本文便是针对这个问题，而对八十多年来中国人类学的发展进行了简明而具体的总结，以期引起更多的人们对它的重视和研究兴趣，为尽快建成具有中国特色的人类学而共同努力。     

Structure and Property of Silk Fibroin ／ Cellulose Blend Film

Silk fibroin/cellulose blend films were prepared using Nmethylmorpholine-N-oxide (NMMO) as solvent. The effects of different proportions and solid contents on properties of blend films were discussed. The mechanical properties showed that the blend films had preferable moisture permeability and a high strength. The structures of the blend films were investigated by infrared spectrum and X-ray diffraction. The results indicated the occurrence of hydrogen bonds between hydroxyl groups of cellulose and amido groups of fibroin.     

Production of Biodegradable Copolyesters and Terpolyesters of Polyhydroxyalkanoates by Alcaligenes latus DSM 1124

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计算MnBm型弱碱弱酸盐溶液精确[H^＋]的普适公式（Ⅲ）

本文提出了计算ＭｎＢｍ型弱碱弱酸盐溶液精确［Ｈ＾＋］的普适公式，一般迭代１￣２次便可求出［Ｈ＾＋］的精确解。     

Cytotoxicity and Apoptotic Effect of Phytoceramide IV Containing Liposomes on Murine Mastocytoma Cell P815

The cytotoxicity and apoptotic effect of phytoceramide IV （N-palmitoyl-phytospingosine） were investigated by preparaing the ceramide containing liposomes using cholesteryl hemisuccinate （CHEMS） and methoxypolyethylene glycol （2000） cholesteryl succinate （PEGCHS）. The ceramide-containing liposomes prepared using ultrasonication contained CHEMS and the phytoceramide IV at a molar ratio of 1：1. Gel chromatography and high performance liquid chromatography equipped with an evaporative light-scattering detection （HPLC-ELSD） were used to analyze the liposomes. The results show that the ceramide entrapment efficiency is over 90% and the molar ratio of phytoceramide IV to CHEMS is 1：1.4. The ratio of ceramide to CHEMS as well as the ultrasonication duration affects the liposome properties. The phytoceramide Ⅳ encapsulated in the liposomes reduces the cellular activity of the murine mastocytoma cell line P815 in a dose-dependent manner and the reduction of cellular activity is due to cell apoptosis. 4. 6-diamidino- 2-phenylindole dihydrochloride （DAPI） staining further supports this result. The encapsulation of highly hydrophobic ceramides into liposomal formulations could become a potential candidate for enhanced apoptosis.     

Construction of Yeast Vectors with Resistance to Geneticin

IntroductionYeast Saccharomyces cerevisiae (S.cerevisiae) hasbeen widely used in molecular biology as well asinthe industrial production.Its genetic backgroundhas been well studied and a series of cloning andexpression vectors have been constructed for DNAtransformation into yeast[1 ] .The selection markersof these conventional vectors are usually H IS3 ,TRP1 ,LEU2 ,and URA3 [1 ,2 ] . These selectionmarkers are responsible for the biosynthesis ofsome amino acids and consequently the hos…     

Production of Poly(3-Hydroxybutyrate-co-3-Hydroxyhexanoate) Using Aeromonas hydrophila 4AK4 Grown in Mixed Carbon Source

IntroductionPolyhydroxyalkanoates (PHAs) are intracellularenergy storage materials and/or reduction agentsthat are synthesized by many microorganisms[1 ] .Because these bacterial PHAs are trulybiodegradable thermoplastics or elastomers,theyhave attracted much attention in industry[2 ,3 ] .Poly(3 -hydroxybutyrate) (PHB) wasthefirst PHA to beproduced on a large scale and poly (3 -hydroxybutyrate-co-3 -hydroxyvalerate) (PHBV)was laterused in commercial applications.Recently,novel PHA copo…     

通过叶绿体基因工程在烟草中合成中长链羟基脂肪酸聚酯

中长链羟基脂肪酸聚酯(medium-chain-length-PHAs, mcl-PHAs)属于微生物聚酯. PHA合酶(PHA synthase, 由phaC基因编码)和3-羟酰基-酰基转移蛋白-辅酶A转移酶(3-hydroxyacyl-acyl carrier protein-coenzyme A transferase, 由phaG基因编码)是mcl-PHAs生物合成途径中的关键酶. 以aadA(氨基糖苷-3′-磷酸转移酶)基因做筛选标记, 分别构建了含phaC2基因的单价叶绿体转化表达载体pTC2以及同时嵌合phaC和phaG基因的双价叶绿体转化表达载体pTGC. 通过PDS1000/He基因枪转化法转化烟草, 获得具有壮观霉素抗性的叶绿体型转基因烟草植株, PCR和Southern Blot结果表明, 外源基因确已整合进烟草叶绿体基因组中且基本达到同质化. 气相色谱法检测转基因株系中的mcl-PHAs含量最高达4.8 mg/g干重, 合成的PHAs单体主要成分为3-羟基辛酸(3-hydroxyoctanoate, 3-HO)和3-羟基癸酸(3-dydroxydecanoate, 3-HD). 透射电子显微镜观察到转基因烟草叶片叶绿体中确有PHAs颗粒累积.     

整粒玉米对羔羊生产性能及养分消化率的影响

研究了整粒玉米对绵羊日增重、饲料转化率和养分消化率等的影响。选择体重约24kg的杂交羔羊20只，随机分为2组。对照组饲喂基础日粮，试验组每以等量整粒玉米替代基础日粮中的玉米。结果表明：平均日增重试验组比对照组高32．73g，提高20．69％（P〈0．05），饲料转化效率提高14．52％。干物质和有机物质的消化率试验组明显高于对照组，分别比对照组提高8．22和5．92个百分点。