Analysis of Microbial Community and its Response to PAHs Contamination in Mangrove Sediment based on High-throughput Sequencing Technology

多环芳烃（PAHs）是一类广泛存在于环境中的持久性有机污染物，具有“三致”（致癌、致畸、致突变）效应，由其引起的红树林湿地生态系统污染受到了研究者的广泛关注。红树林湿地沉积物中含有许多具有降解PAHs功能的微生物群落，对它们的研究逐渐成为焦点。本论文以福建漳江口红树林国家级自然保护区为研究区域，以原位沉积物、由原位沉积物与PAHs构成的污染压力下红树林湿地沉积物微宇宙microcosm体系为研究对象，采用16SrRNAcDNA文库构建技术、Illumina高通量宏基因组测序技术、454高通量测序技术以及生物信息分析等手段，开展了红树林湿地原位沉积物中的微生物群落及其对PAHs污染响应的研究。主...Polycyclic aromatic hydrocarbons (PAHs) are one class of persistent organic pollutants, widely distributed in the environment. PAHs are considered hazardous because of their cytotoxic, mutagenic, and carcinogenic effects. Mangrove ecosystems, which are important inter-tidal estuarine wetlands along the coastlines of tropical and subtropical regions, are exposed to anthropogenic contamination by PA...学位：理学硕士院系专业：生命科学学院生物学系_微生物学学号：2172009115214

我国旅游业经营管理体制存在的问题及对策

旅游业作为"无烟工业"、"朝阳产业",其在国民经济和社会发展中的重要作用越来越引起各国政府的重视。在我国,旅游业虽然起步较晚,但其发展势头强劲,市场前景广阔,潜力巨大。旅游业的重要性,尤其是在拉动内需、回笼货币、解决就业、提高人民群众的生活质量以及在西部大开发战略等方面所起作用,党中央、国务院以及各级政府都十分重视。由于历史的原因,在我国旅游业发展过程中还存在诸多不尽人意的地方。本文主要是从我国旅游业的宏观管理体制以及企业的微观经营管理水平的角度出发,找出在这些方面制约旅游业发展的原因,并相应提出了解决这些问题的一些建议。本文共分四章。第一章简要回顾了我国旅游业的发展历史,介绍了旅游业的现状,...学位：管理学硕士院系专业：管理学院企业管理系_工商管理硕士(MBA)学号：X199815062

A Long Run Risks Model with Rare Disaster

股权溢价之谜是当前金融和经济领域中最重要的谜团之一，在过去的20多年里，尝试解决这个谜团已经成为金融和经济领域里一个主要的研究动力。找到一个既能够解释股权溢价之谜，且其背后隐含的经济学关系又与现实不冲突的资产定价模型成为了众多金融经济学家的追求。 长期风险模型和灾难性风险模型是解决股权溢价之谜的众多努力和尝试之中表现较为突出的两类模型。Banal,KikuandYaron(2010)首次提出了把长期风险和灾难性风险结合在一起解决股权溢价之谜的想法。本文主要的工作就是进一步发展和改进Banal,KikuandYaron(2010)的模型。在两方面对他们的模型进行了改进：1.与他们直接假设灾难性...Equity premium puzzle is one of the most important puzzles in finance and economics. For this reason, over the last 20 years, attempts to resolve the equity premium puzzle have become a major research impetus in finance and economics. It becomes most financial economists’ pursue to find an asset pricing model that can resolve the puzzle. And at the same time the potential implications of the model...学位：经济学硕士院系专业：王亚南经济研究院_金融学(含保险学)学号：2772011115270

启动多种DOS版本的系统软盘

微型计算机一问世,支持它的核心软件也应运而生。从1981年dOS1.0开始,直到1987年dOS3.30的推出,标志着磁盘操作系统日趋成熟。在这期间,我国PC机也开始得到迅速普及和发展。随之而来的各种中文操作系统、中文文字处理及数据库等汉化软件,纷纷涌现。但dOS的发展并未划上休止符,尔后几年间,dOS4、dOS5、dOS6接二连三地出台。电脑用户们很快发现:不少中文应用软件却无法在dOS新版本上正常运行。当然,这不是应用软件开发者的过失,

南方红豆杉内生真菌的初步研究

从共生理论出发,对采自福建省龙岩山区的药用植物南方红豆杉的内生真菌进行分离。从南方红豆杉的树叶、短茎和树皮中共分离得到107株内生真菌。抗菌、抗氧化和抗肿瘤活性检测结果显示,其中有8株菌对1种或者几种指示菌有一定的抗菌活性,占供测菌株的7.48%;有40株菌对HElA细胞有较强的细胞毒活性,占供测菌株的37.38%;有2株菌对dPPH·有机自由基有较强清除活性,占供测菌株的1.87%。从南方红豆杉内生真菌XylArIAlES SP.的固体发酵产物中初步分离并鉴定出化合物10,11-dIHydrOXynErOlIdOl,该化合物表现出了一定的抗氧化作用。说明南方红豆杉植物中含有丰富的菌种资源,具有开发生物活性物质的潜力

论司马迁经济思想的现代契合与观照

司马迁的经济思想主要体现在《史记》一书中。《史记》成书距今已有2000多年时间,但其中所蕴含的经济思想与现代经济思想比较,却有许多异曲同工之处。基于此,本文以现代经济学的视角对司马迁的经济思想进行探析

Herbicidal Activities of Corn Gluten Peptides Prepared by Different Proteases and Their Relations to Molecular Weight.

以碱性蛋白酶、木瓜蛋白酶、风味蛋白酶和中性蛋白酶4种蛋白酶为水解酶制备玉米蛋白水解肽,用培养皿生物分析法检测在不同浓度(0.5、1.0、2.0和5.0 mg.mL-1)下的4种玉米蛋白水解肽对光鳞水蜈蚣(Kyllingabrevitoliavar.leiolepis)种子萌发过程中根系生长的抑制活性;采用超滤法制备相对分子质量不同的肽段并比较其除草活性。结果表明:不同浓度下的4种玉米蛋白水解肽对光鳞水蜈蚣种子萌发过程中根系生长均有抑制作用,且随着水解肽浓度的增高,其对根系生长的抑制活性增强;碱性蛋白酶、木瓜蛋白酶制备的玉米蛋白粉水解肽对根系生长的抑制活性明显高于风味蛋白酶和中性蛋白酶制备的玉米蛋白粉水解肽。相对分子质量不同的玉米蛋白粉水解肽对根系生长的抑制活性存在差异,5 000 u以下的小分子肽具有更高的抑制活性。Corn gluten peptides were prepared by four different kinds of proteases and their respective root-inhibiting activities on smoothscale kyllinga(Kyllinga brevitolia var.leiolepis) were evaluated in Petri dish bioassay when they were(0.5),1.0,2.0 and 5.0 mg·mL~(-1) in concentration.Results show that they all demonstrated root-inhibiting activity,which increased with their concentration.Herbicidal activities of peptides prepared by alcalase and Papain were significantly higher than those prepared by flavourzyme and neutrase.The peptides varied in bioactivity with molecular weight.Peptides small in molecular weight(<5 000 u) exhibited higher herbicidal activity than those large in molecular weight.广东省科技发展项目(03KJ6062

A preliminary study on the herbicidal activity of the hydrolysates from five natural protein materials

以鱼粉、肉骨粉、豆粕、菜籽粕及芡粉等几种天然蛋白原料为底物,以碱性蛋白酶为水解酶制备出天然蛋白原料的水解物,用培养皿生物分析法检测不同蛋白原料水解物在不同浓度(0.5、1、2、5 mg/mL)条件下对杂草野菊种子的生根抑制活性。结果表明:不同蛋白原料制备出的水解物对野菊种子萌发根系生长均有抑制作用,并且随着浓度增加其抑制活性增强,不同蛋白原料水解物的除草活性有显著性差异,其除草活性顺序为:鱼粉水解物>肉骨粉水解物>豆粕水解物>菜籽粕水解物>芡粉水解物,水解物的根抑制活性与原料的蛋白含量及其水解物的多肽含量成正相关性,作者推测,天然蛋白水解物中的多肽可能是植物种子萌发时根系生长抑制活性物质,但这种根抑制活性究竟是由于特异性多肽的化感作用还是植物种子萌发时对高氮胁迫反应有待进一步研究。The hydrolysates of five proteins materials,namely fish meal(FM),meat and bone meal(MBM),soybean meal(SBM),rapeseed meal(RSM) and wheal gluten meal(WGM),were prepared with alcalase and their root-inhibiting activity to Indian dendranthema,Dendranthema indicum(L.) Des Moul was measured in Petri dish at different concentrations,i.e.0,0.5,1,2,5 mg/mL.All hydrolysates showed root-inhibiting activity,and their bioactivity was raised as their concentrations increased.The herbicidal activities of the five hydrolysates were significantly different from each other.The herbicidal activities declined in the following sequence: fish hydrolysate(FH),meat and bone hydrolysate(MBH),soybean hydrolysate(SBH),rapeseed hydrolysate(RSH) and wheat gluten meal(WGH).The root-inhibiting activity was positively correlated to the peptide contents of the hydrolysates and protein contents of the materials,suggesting that the peptides in the hydrolysates were herbicidal bioactive substances.However,whether the herbicidal activity is due to the allopethy of special peptides or only to the high N stress against germinating seeds remains unclear and further studies are needed.广东省科技发展项目(03KJ6062

Seasonal Variations and Cluster Analysis of the Turf Weed Communities in Shenzhen,China

用样线法调查了深圳市区不同管理类型草坪的杂草周年发生及分布情况,并用系统聚类法分析了各草坪杂草群落的发生规律。共观察到25科83种草坪杂草,其中春季发生的杂草种类67种,夏季68种,秋季70种,冬季49种,四季共有的种类40种,占总数的48.2%;香附子、光鳞水蜈蚣、狗牙根、千根草等9种杂草为优势种,也是重要的防除对象;深圳市草坪杂草全年共分为15类群落,其中春季3类,夏、秋、冬季各4类,管理水平是影响杂草群落发生特征的最直接因素。The species composition and seasonal variations of the turf weed communities were investigated in Shenzhen with line intercept method,and all the data obtained were analyzed with cluster analysis.Totally 83 species belonging to 25 families were found,of which 67,68,70 and 49 species were observed in spring,summer,autumn and winter,respectively.The species occurred in all the four seasons counted for 48.2% of the total species.Cyperus rotundus,Kylling abrevitolia var.leiolepis,Cynodon dactylon and Euphorbia thymifolia were dominant and the most dangerous weed species.The turf weeds were classified into 15 communities,of which 3 communities observed in spring while 4 communities investigated in each of the other three seasons.Management level is the most important factor affecting the weed communities' structure.广东省科技发展项目(03KJ6062

The Combustion Property of Rare earth based Fluorite Type Oxide

CE基萤石型材料因低价阳离子ln3＋的掺杂，降低了它的还原温度，增强了氧化还原能力，故可较好地促进甲烷等挥发性有机物的完全燃烧，具有与钙钛矿形型化合物相类似的性能，而其热稳定性更好，因而有望在醇类代用燃料汽车的尾气净化处理中发挥更大作用。Doping with lower valence cations,the reducing temperature of Ce based Fluorite type materials can be lowered,and the reduction oxidation property can be enhanced.This Facilitates the combustion of methane as perovskite compounds do,and the Former has a better thermal stability.This material can play an important role in the treatment of exhaust gas From alcohol Fueled vehicles.福建省自然科学基