Results 81 to 90 of about 74,833 (278)

Effect Assessment of Marine Ecological Restoration:A Case Study of Sansha Bay [PDF]

open access: yes, 2016
由于人类对海洋资源的无序开发,海洋生态系统面临着环境恶化、结构失调、功能衰退等诸多问题,并逐渐制约海洋的可持续发展。海洋生态修复作为当前缓解生态系统退化压力、恢复受损生态系统结构功能的重要手段,是海洋生态系统管理的核心内容之一。但目前针对海洋生态修复的研究大多以针对单一生境的修复技术措施为主,缺乏对海洋生态系统各组分综合修复的系统研究,对如何评判海洋生态系统修复的效果,更是关注甚少。科学合理的对海洋生态修复实践进行评价,可以及时掌握生态系统对人工修复的响应和反馈 ...
李倨莹
core  

An Ultrasmall Strontium‐Loaded Polydopamine Nanoformulation for Near‐Infrared‐Enhanced Periodontitis Therapy via Photodynamic Gas‐Promoted Antibacterial and Bone Repair

open access: yesRare Metals, EarlyView.
ABSTRACT Periodontitis is a chronic infectious oral disease triggered by periodontopathogenic bacteria, resulting in the progressive inflammation and destruction of the tissues surrounding teeth. To achieve reprogramming of the infectious microenvironment for periodontitis therapy, a nanoformulation was proposed by loading polydopamine (PDA) with ...
Hao Liang   +14 more
wiley   +1 more source

Comparison of photosynthetic characteristics and chlorophyll fluorescence parameters of Juglans cathayensis var. formosana in different habitats(不同生境华东野核桃光合生理特性及叶绿素荧光参数比较)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2013
采用LI-6400便携式光合作用系统,于2011年7月下旬的晴朗天气条件下,对浙江省天台山林窗、林缘、林下生境华东野核桃(Juglans cathayensis var. formosana)的光合生理特性及叶绿素荧光参数进行测定,并比较林窗生境中华东野核桃与其伴生植物山胡椒(Lindera glauca )、玉兰(Magnolia denudata)、云锦杜鹃(Rhododendron fortunei)光合日进程的差异.结果表明:夏季,林窗生境的华东野核桃及主要伴生植物叶片的净光合速率(Pn ...
LIYue-ling(李月灵)   +3 more
doaj   +1 more source

小鱼仙草精油化学成分的GC-MS分析 [PDF]

open access: yes, 2002
福建省科委基金资助项目 (K20096);福建省自然科学基金项目;国家中医药管理局项目 (2000-J-P ...
林文群, 陈忠
core  

Effects of Oxytetracycline on Population Growth and Genetic Diversity of Euplotesvannus (Marine Protist) [PDF]

open access: yes, 2016
抗生素作为一类环境污染物在海岸带生境中广泛存在,它们对海洋原生生物遗传多样性的影响还不清楚.本工作以一种海洋纤毛虫原生生物(扇形游仆虫(Euplotes vannus))为例,研究了一种常见四环类抗生素(土霉素)对其生长的影响,并通过单细胞(个体)分析,探索了抗生素对其大核基因组中核糖体小亚基RNA基因(SSU r DNA)序列多样性的影响.结果表明,与对照组相比,3个土霉素处理组(1,10和20μg/m L)中纤毛虫的自然增长率随土霉素浓度升高显著降低,细胞大小则呈增大趋势.SSU r ...
付娆   +3 more
core   +1 more source

High‐Temperature Stable Narrowband Near‐Infrared Phosphor‐Converted Light‐Emitting Diode Based on Melt‐Grown CsPbCl3: Yb3+ Crystal

open access: yesRare Metals, EarlyView.
ABSTRACT Narrowband near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) featuring low full‐width at half maximum (FWHM) and high conversion efficiency are crucial for chemical content evaluation, light therapy, and bioimaging.
Chunshen Li   +4 more
wiley   +1 more source

野生动物生境破碎化理论探讨

open access: yes野生动物学报, 2014
生境破碎化是指由于人类活动或自然因素引起生境变化的一个生态过程。生境破碎化是生态学和保护生物学中较新的理论,已成为保护生态学、景观生态学和保护生物学研究领域中备受关注的热点问题之一。本文介绍了生境破碎化的基本概念、主要特点,以及生境破碎化在种群、群落、生态系统和景观层次引起的生态效应,概括了生境破碎化在形式上和功能上的主要表现。同时综述了生境破碎化研究的起源、发展和在森林采伐、道路及边缘效应3个主要方面的研究进展,并着重探讨了生境破碎化:(1)对野生动物生物多样性保护带来的生态效益;(2 ...
张明海 马建章
doaj  

Method and Practice in Setting Coastal Construction Setback Line: A Case Study in Longhai [PDF]

open access: yes, 2016
海岸带地区由于其富饶的资源、优美的环境、优越的地理位置和独特的海陆性质,使其成为人类活动最密集和最活跃的区域。然而人类为了享受海岸带地区为其生存和发展带来更大的经济利益,一方面越来越多的建筑物和基础设施出现在距海岸线更近的地方,海岸侵蚀以及自然灾害已经严重的威胁到沿海地区人类生命财产的安全;另一方面由于人类活动的加强,海岸带的生态系统遭到破坏,生态环境日趋恶化。如何协调海岸地区的和谐发展,实现海岸带经济发展的可持续性已经成为当今社会最关注的热点问题之一 ...
黄玥
core  

Engineering a Tumor‐Targeted MgH2@Lip/PD‐L1 Nanoplatform for Synergistic Hydrogen Therapy and Immune Activation

open access: yesRare Metals, EarlyView.
ABSTRACT Lung cancer remains the leading cause of cancer‐related deaths worldwide, yet immune checkpoint blockade (ICB) is often compromised by an immunosuppressive tumor microenvironment (TME) with acidosis, hypoxia, and poor T cell infiltration. Here, we develop a TME‐responsive nanoplatform (MgH2@Lip/PD‐L1) that couples hydrogen gas therapy with PD ...
Xuyu Gu   +5 more
wiley   +1 more source

Characteristics of chemical compositions and sources of PM2.5 in winter at Lin′an(杭州市临安区冬季PM2.5化学组成特征和来源解析)

open access: yesZhejiang Daxue xuebao. Lixue ban
In order to study the pollution characteristics and source contributions of PM2.5 at Lin'an, located in Hangzhou City, the PM2.5 component online monitoring was conducted from December 23, 2021, to February 28, 2022, and the sources apportionment of PM2 ...
马勤(MA Qin), 许振波(XU Zhenbo)
doaj   +1 more source

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