47 research outputs found

    Oral immunization studies relied on the live attenuated bacteria in vivo expressing antimicrobial peptides AS-prohepc2 and Scy1 in fish

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    抗菌肽是鱼、虾、贝等非特异性免疫防御系统的主要成分之一,在防御外源性病原体入侵方面起着重要作用。作为一类独特的天然免疫活性物质,抗菌肽具有广谱的抗微生物活性和免疫调节活性。迄今从鱼类、甲壳动物、贝类等海洋动物中已分离获得了多种不同类型的抗菌肽,并揭示了其基因和蛋白结构以及表达特性、抗微生物活性以及某些抗菌机理;现有试验结果亦逐渐证明抗菌肽有望作为抗生素一定程度的替代品,在水产养殖业及其他行业具有应用前景,但迄今对其有效利用途径且进入机体后的免疫效应知之甚少。 天然运载载体(如细菌、病毒和哺乳动物细胞等)具有良好的体内功能和药物运载载体特性,活菌载体是其中广泛应用的载体系统之一,可将目的蛋白基...Antimicrobial peptides are considered to be one of the main components of innate immune defense system in fish, shrimp and shellfish. Antimicrobial peptides play an important role in the defense of exogenous pathogens. As a class of natural immunologically active substance, antimicrobial peptides possess broad-spectrum antimicrobial and immunomodulatory activity. So far a variety of antimicrobia...学位:理学博士院系专业:海洋与环境学院_环境科学学号:2262008015012

    Research on Director's Self-dealing Transaction

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    对董事自我交易行为进行规范是董事忠实义务研究的核心问题,纵观两大法系各代表国公司法,无不对此著墨甚多。反观我国的《公司法》仅在第61条第2款作出原则性的规定,且缺乏具体的配套条款。这种立法上的滞后在实践中导致了一系列有害后果的发生。基于此,本文从基本理论出发,分析我国《公司法》在自我交易规制上的不足,并对两大法系国家董事自我交易的规定进行比较分析,最后提出完善我国公司立法的建议。本文除前言和结语外,共分为四章。第一章是有关董事自我交易的基本理论问题。主要讨论了董事自我交易的概念、认定、分类及规制的法理基础与制度价值,以此作为后文深入展开的基础。第二章是对我国公司法规定的董事自我交易规范进行的分...The regulation of directors’ self-dealing is the core issue of the reseach of directors’ duty of loyalty. Many a foreign countries have corporation laws which have substantive rules of directors’ self-dealing. But the current Corporation Law of China prescribes only some principles in Article 61 Section 2 about this matter, which are not operable without detailed rules. This kind of legislative la...学位:法律硕士院系专业:法学院法律系_法律硕士(JM)学号:20020812

    Advances in Toxicity of Polychlorinated Biphenyls on Animals and Human Livers

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    多氯联苯(PCbS)是一类广泛存在于环境中的持久性有机污染物。笔者综述了PCbS的特性及其对动物和人类肝毒性影响的研究进展。已有的研究结果表明,PCbS对动物肝脏有致损害及致癌作用;但对人类而言,除在重大污染事件中发现PCbS可导致人类肝疾病,直至死亡外,职业暴露和环境中长期低剂量暴露实验均未证实PCbS暴露与人类肝脏的损伤及其致癌作用有关。但某些地区人群高肝癌发病率及其环境中PCbS的检出预示着其中有一定的关系,值得深入研究。Polychlorinated biphenyls(PCBs) is one of persistent organic pollutants which are widely exist in environment.This review described PCBs characteristics and toxicity on animals and human livers.Before now,it was identified that PCBs caused liver damage and hepatocarcinogenicity for animals.However,occupational studies and long-term,low level exposure studies to human beings have found no direct correlation between PCBs exposure and liver damage and carcinogenicity,only accidental environmental exposures have found increased mortality of liver disease.But high morbidity of human liver cancer and detected PCBs in the environment were reported in some regions.It is evident that more researches should be done.国家自然科学基金资助项目(20777062

    Determination of Fluoranthene Adsorbed on the Surfaces of Mangrove Leaves by Fiber Optical Fluorimetry

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    利用光纤荧光法实现了吸附于白骨壤(AM)、海漆(EA)、秋茄(kC)、桐花树(AC)和老鼠簕(AI)叶片表面上荧蒽(f lA)的定量测定。所建方法测定吸附于AM、EA、kC、AC和AI叶片表面上f lA的线性范围分别为2.5--500、2.0--600、4.5--1 100、15--600、3.5--450 ng/SPOT,相应的检出限分别为0.91、0.63、1.12、3.52、1.40 ng/SPOT,方法的相对标准偏差小于7.8%(n=15),加标回收率分别为97%--108%、78%--95%、77%--90%、84%--108%和78%--102%。利用所建方法考察了5种红树叶片正反面吸附不同量f lA的信号强度随时间的变化情况。结果表明:在200 M In内,叶片正反面上f lA的信号均发生不同程度的衰减,且反面的信号衰减率大于正面;5种红树叶片正反面对f lA的吸附特性均不同;吸附于叶片正面的f lA多残留在叶片表面,而吸附于叶片反面的f lA易向叶片内部迁移。A fiber optical fluorimetry for determination of fluoranthene(Fla) adsorbed onto the surface of five kinds of mangrove leaves was established.Experimental results showed that the linear dynamic ranges for determination of Fla adsorbed onto Avicennia marina(Am),Excoecarla agallocha(Ea),Kandelia candel(Kc),Aegiceras corniculatum(Ac) and Acanthus ilicifolius(Ai) leaves were 2.5-500,2.0-600,4.5-1 100,15-600 and 3.5-450 ng/spot,with detection limits of 0.91,0.63,1.12,3.52 and 1.40 ng/spot,respectively.The relative standard deviations were less than 7.8%(n=15).The experimental recoveries for Fla adsorbed onto Am,Ea,Kc,Ac and Ai leaves were 97%-108%,78%-95%,77%-90%,84%-108% and 78%-102%,respectively.The variation of fluorescence signals of different amounts of Fla adsorbed onto upper and lower surface of five kinds of mangrove leaves with time were also investigated.The results showed that fluorescence intensities of Fla adsorbed onto two surfaces of mangrove leaves were decreased differently in 200 min,and the fluorescence decrements of Fla adsorbed onto lower surface were all bigger than those from the corresponding upper surface.Both of upper and lower surfaces of the five mangrove species showed different capacities to adsorb Fla.Most of Fla adsorbed on the upper surface of mangrove leaves were remained,while some of the Fla adsorbed onto the lower surface of leaves could be penetrated easily into the inner sides of mangrove leaves.国家自然科学基金资助项目(20777062);教育部博士点基金资助项目(200803840015

    抗光老化海洋生物活性物质作用机制研究进展

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    紫外辐射是导致皮肤光老化的主要因素。近年防止紫外线对皮肤的伤害已被大众所重视,探索预防光老化活性物质成为研究热点。海洋是人类巨大的生物资源和物质资源宝库,特殊的环境条件造就了许多具备化妆品功效的海洋生物活性物质。综述阐述了皮肤光老化的外在表现及机制,总结了海洋多糖、酚类化合物、类胡萝卜素、萜类化合物和类菌胞素氨基酸等海洋生物活性物质抗皮肤光老化的保护机制,为其在光保护海洋功能化妆品中的研究和应用提供理论依据。福建省省属公益类科研院所基本科研专项(2017R1003-13);;福建省海洋与渔业结构调整专项[2015];;闽海洋高新[2016]07

    长期保存系统数据存储管理策略研究与应用

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    本文对数字资源长期保存系统的数据存储管理策略进行了深入研究。首先分析了OAIS中需 要管理的信息类型和存储模型,进而归纳总结了国际各保存项目所采用的数据存储管理策略和方 法,在参考前人研究的基础之上,笔者在中国科学院文献情报中心的数字资源长期保存系统的研 发过程中,制定了基于Fedora仓储的混合型数据存储管理策略,并在文章最后给出了相关建议。</p

    口服投喂抗菌肽Scygonadin对黑鲷免疫及抗氧化指标的影响

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    本实验以黑鲷(SPAruSMACrOCEPHluS)为研究对象,利用抗菌肽基因工程表达产物SCygOnAdIn进行口服试验,探讨抗菌肽口服后是否对鱼体内免疫学指标或者抗氧化反应指标有影响。黑鲷空腹三天后,口服投喂不同浓度(0.2、0.4、0.8 Mg/M l)的SCygOnAdIn各100μl,以PbS为对照组,采集不同时间点(6、12、24、48、72 H)血清及肝、肠组织样品,测定超氧化物歧化酶(SOd)、脂质过氧化(MdA)、一氧化氮合酶(nOS)、一氧化氮(nO)、谷胱甘肽(gSH)等抗氧化指标。实验结果表明黑鲷口服投喂基因工程表达产物SCygOnAdIn对其免疫及抗氧化指标无显著性影响,表明口服抗菌肽SCygOnAdIn不会影响鱼类的正常免疫功能,从而为抗菌肽在水产养殖业的应用提供了科学依据

    胶原特性及其制备方法研究进展

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    本文阐述了胶原、明胶和胶原多肽三者的概念和不同点,介绍了胶原的结构以及Ⅰ型胶原和Ⅱ型胶原的差异,总结了胶原的七种制备方法,并对各种制备方法的优缺点进行分析,为水产动物资源制备胶原提供参考。福建省海洋生物增养殖与高值化利用重点实验室(361013);;福建省海洋生物资源开发利用协同创新中心(361013

    Effect on Photoluminescence Intensity of Porous Silicon Processing by a Wet Oxidized Technology

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    【中文文摘】在适当条件下氧化多孔硅是提高多孔硅发光强度的良好途径。首次采用含CH3CSNH2的HF酸水溶液作为氧化剂对初始多孔硅进行了湿法阳极氧化,大大改善了多孔硅的发光强度,并研究了氧化电流密度、氧化温度、氧化时间等一系列因素对氧化多孔硅光致发光强度的影响。实验发现,在电流密度1mA/cm2,氧化液温度60℃,氧化时间为10min的条件下,可以获得最强光致发光;在此最优条件下得到的氧化样品较初始样品发光增强了18倍。 【英文文摘】Oxidizing porous silicon in proper condition is a good approach to improve PS photoluminescence intensity.We for the first time using electrolyte containing CH_3CSNH_2 to oxidize initial PS,which boost up photoluminescence intensity of PS greatly.We also studied oxidizing current density,oxidizing temprature,oxidizing time etc.It is testified that the best intensity of PL can be obtained when oxidizing for 10 minutes in 60 ℃ oxidizing solution using 1 mA/cm~2 current density.In these conditions we can obtain best photolumine scence intensity which is 18 time s than that of original porous silicon

    皱纹盘鲍HdhTPX2基因在毕赤酵母中的表达及抗氧化活性研究

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    为研究皱纹盘鲍Haliotis discus hannai Ino硫氧还蛋白过氧化物酶(TPX2)蛋白的抗氧化活性,将HdhTPX2基因克隆至pPIC9K载体,通过电击转化至毕赤酵母GS115菌株中,获得重组表达质粒pPIC9K-HdhTPX2,经甲醇诱导及亲和层析纯化得到重组HdhTPX2蛋白,并进行质谱鉴定及体外抗氧化功能检测。结果表明:本研究中成功构建了重组毕赤酵母菌株GS115/pPIC9K-HdhTPX2,经表达条件的优化,在pH为7的培养基中用0.5%甲醇诱导表达72 h,分泌表达上清液中得到相对分子质量约为25 000的稳定表达产物,纯化后的蛋白经质谱鉴定为目的蛋白;体外活性测定发现,该蛋白清除羟自由基(·OH)能力强于维生素C,并对H2O2引起的细胞损伤具有一定的保护作用。研究表明,皱纹盘鲍硫氧还蛋白过氧化物酶HdhTPX2在毕赤酵母表达系统中得到高效表达,重组表达产物具有抗氧化活性功能。福建省自然科学基金资助项目(2017J01041);;\n国家海洋公益性行业科研专项(201405016);;\n福建省海洋生物增养殖与高值化利用重点实验室开放课题(2015fjscq04
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