22 research outputs found

    Pretreatment with solid phase extraction and analysis with liquid chromatography/mass spectrometry for siderophores in seawater

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    铁在生物的生命活动中扮演着重要角色,如含铁蛋白在生物的光合作用、呼吸作用、硝酸盐和亚硝酸盐的还原、氮的固定及DNA的合成等过程中都起着不可替代的作用。但是海洋表层的生物可利用态铁浓度极低,影响甚至限制着浮游植物的生长。在铁限制条件下,海洋中的一些细菌和真菌能够合成并分泌一种与铁有极强螯合能力的低分子量有机配体——铁载体。铁载体被释放到细胞外后有效地与铁结合,通过细胞膜上特定铁载体受体的识别和转运,将铁运输到微生物细胞内,以满足生物体对铁的需求。 由于铁载体结构复杂多样,在海洋环境中浓度低,分析相对困难。传统的前处理方法存在着操作繁琐、重现性较差等缺点;经典的铁载体测定方法易受基底干扰,回收率...Iron plays an important role in life activities. For example, iron-containing metalloenzymes are essential for many life processes, including photosynthesis, respiration, nitrate and nitrite reduction, nitrogen fixation and DNA synthesis. However, the concentration of bioavailable iron in the ocean surface is extremely low that limits phytoplankton growth. In some open oceans where iron is limited...学位:理学硕士院系专业:环境与生态学院_环境科学学号:3312012115166

    Empowerment of mobile news app user's comments--A case study of Netease News app

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    本文通过对网易新闻客户端下的原创栏目“今日之声”的内容和其用户跟帖进行抽样分析,同时结合笔者对网易新闻客户端用户QQ群的聊天内容的观察,试图寻找在移动客户端时代,便捷的新闻获取途径和评论发表途径是否促进了用户的个人赋权心理的发生,在被网友称为“只是一种情感宣泄”的只字片语的评论中是否呈现出网友对于社会公共事务的思考,对于政治赋权的参与。本文基于赋权的视角将作为受众和用户的移动新闻客户端使用者在对新闻进行跟帖的行为进行质化和量化相结合的考察,通过将新闻跟帖的文字信息归类到不同的赋权层面,考察表达框架和态度,评估其在赋权的不同层面上的表现。通过对“今日之声”近一年的评论进行考察,笔者总结出移动客户...In This article the author is going to find out if users of news app have been empowered due to the convenient ways to access information and the unrestricted paths to publish comments. This article is a case study about Net easy News App. Through the analysis of data collected from the contents and the comments of "Voice of Today". This is one of the net ease news original columns. This research ...学位:新闻与传播硕士院系专业:新闻传播学院_传播学学号:3192011115292

    Compensation System Design for XHJ Real Estate Company

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    伴随着行业的飞速发展,房地产业呈现出专业性强、风险大、投资额大、投资回收期长、工作关系复杂等特点。这些特点决定了房地产从业人员必须要具有扎实的专业知识、良好的心理素质、长远的眼光及很强的综合能力。许多房地产企业近几年发展困难,原因固然很多,但房地产从业人员专业素质较差,企业领导对人力资源管理工作重视不够是其中最直接的原因之一。因此人力资源管理对房地产企业来说是一项十分重要的工作。“人才问题”普遍成为房地产企业人力资源管理的核心问题。 薪酬管理是人力资源管理的重要组成部分。对企业来说,如何正确处理企业利润的自我积累和员工分配之间的关系;如何客观、公正、公平、合理地进行企业内部员工之间的收入分配...With its rapid development, real estate industry in China, has shown the characteristics of high degree of specialization 、high risk、 great investment amount、 long payback period、complex working relationship and so on. These characteristics demand that the real estate practitioners must have a solid professional knowledge, good psychological quality, long-term vision and a strong comprehensive abi...学位:工商管理硕士院系专业:管理学院工商管理教育中心(MBA中心)_工商管理硕士(MBA)学号:1792007115063

    气管旁淋巴结结核侵及气管和头臂干动脉致死1例

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    1案例1.1简要案情张某,女,35岁,某年6月17日,以"反复咳嗽、咳痰、气喘1月余"为主诉入院。入院诊断:前纵隔占位性质待查,气管狭窄。入院后完善检查,于6月20日行支气管镜检查,见气管中段严重狭窄,表面见扁平新生物并溃烂,取新生物送检并置入Y型硅酮支架。6月26日17:00张某无明显诱因下突发大咯血,咯血量约1 000 mL,之后迅速出现意识丧失,给予抢

    肠道固有淋巴样细胞亚群分类及表型检测

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    肠道固有淋巴样细胞亚群细胞因子分泌检测

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    人外周血免疫细胞亚群25色流式全景分析

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    一类超奇性的奇异积分算子及其交换子的有界性

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    Information Asymmetry, Corporate Growth and Private Placement to Related Shareholders Empirical Data from China Securities Market

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    通过定向增发新股进行股权再融资已成为我国上市公司主要股权再融资工具。本文以信息不对称理论为基础,研究了公司的成长性与关联股东认购定向增发新股的关系以及认购后对公司绩效的影响。研究发现,公司的成长性与关联股东认购定向增发新股的比例呈正相关关系,进一步发现,当公司的信息不对称程度越大时,关联股东认购的成长性公司发行的定向增发新股比例也越大,关联股东认购成长性公司发行的定向增发新股比例越大,发行公司未来的绩效越好。Equity refinancing using private placement has become the main financing tool for listed companies in China. Based on asymmetric information theory, this paper studies the association between the corporation growth and the subscription for new shares in the private placement with related shareholders, also the impact on corporate performance after the subscription. The study shows that it is a positive correlation between the corporation growth and the ratio of the subscription for new shares in the private placement with related shareholders. Moreover, related shareholders are expected to subscribe more shares in the private placement issued by corporate with higher growth expectation when the degree of information asymmetry is greater, and the corporate performance in the future is better when the share of the subscription is higher.章卫东教授主持的国家自然科学基金项目“地方国有上市公司定向增发资产注入动机及经济后果研究”(项目号:71262004)的阶段性研究成
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