Results 31 to 40 of about 515,628 (150)
Zhongshan Daxue xuebao. Yixue kexue ban, 2002 摘 要:【目的】观察小鼠胚胎干细胞(ES 细胞)植入大鼠的隔区和海马内后存活和增殖的情况。【方法】以SD 大鼠为宿 主, 将BrdU 标记的ES 细胞植入宿主的隔区和海马内, 移植后l 、2、3、4 和8 周后取脑, 冰冻切片, 进行尼氏、BrdU、PCNA 免疫 组织化学染色, 观察ES 细胞存活和增殖的情况。【结果】ES 细胞移植入大鼠隔区和海马内后, 从第l 周到第3 周, 移植物呈团 块生长, 第4 周移植物较第3 周缩小, 第8 周未发现移植物;BrdU 和PCNA(核增殖抗原 ...
刘 述
doaj
Integrative Conservation, Volume 4, Issue 3, Page 476-490, September 2025.The leaf functional traits of angiosperms and gymnosperms in mountain ecosystems significantly influence phyllosphere fungal diversity. These traits are critical for understanding fungal stress resistance and elevational adaptation, which aids in predicting plant responses to climate change.
Xiaocheng Yu +7 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2013 目前研究认为海马是人体认知、学习和记忆能力的控制中枢。人体衰老后,发生脑老化时海马区也会发生相应的变化,主要表现在海马区突触、神经递质以及基因表达的改变。人脑具有可塑性和代偿性的特点,运动可以逆转突触数量减少及突触体膜流动性的下降,增加c-fos及BDNF的表达 ...
郑妍, 刘忠民, 陈桂秋, 翟天姝
doaj
Wildlife Letters, Volume 3, Issue 2, Page 73-83, June 2025.Blue sheep in Dhorpatan Hunting Reserve prefer alpine grasslands at 3800–4200 m on south‐facing slopes near water resources, favoring areas with low tree cover and dense ground cover, particularly rhododendrons, junipers, and Cyperaceae grasses. Their habitat significantly overlaps with livestock.
Amit Adhikari +4 more
wiley +1 more source
, 2005 根据南海海区、华南和中南半岛的地面露头、钻井、拖网及地球物理资料，分析了南海地区火山活动的时空分布特点。在南海陆缘和周边陆区中生代末期花岗岩分布非常广泛。新生代火山岩活动规模较小，主要是海底扩张之后在洋盆扩张脊、北部陆缘的陆洋边界附近、雷琼地区和中南半岛南部的玄武岩。在南海北部陆缘的深部地震调查中发现，在地壳下部存在小规模的高速异常体，结合浅部的晚第三纪一第四纪火山活动，认为该高速体形成于南海扩张之后。这些特征表明，在南海的拉张过程中岩浆供应不丰富，在陆缘未形成大规模的侵入和喷出岩 ...
刘海龄, 阎贫
core +3 more sources
海洋蕴藏着储量丰富的矿产资源，深海矿产资源开发逐渐成为学术界和工程界的研究热点。管道提升式开采方案是目前公认的最具商业前景的海洋矿产开发方案。矿产输运管道作为连接海底中继舱和海上采矿平台的纽带，需要承受恶劣的风、浪、流环境载荷和复杂作业工况的工作载荷，其设计制造和力学性能分析一直备受关注。相比于刚性管道，柔性管道的弯曲刚度小、便于安装与回收、使用寿命较长。然而，柔性管道的结构复杂，各层之间相互影响，金属柔性管道由于自身结构的限制，在深海采矿行业中难以广泛应用，人们开始把目光放在非金属柔性管的设计与应用上。
徐万海, 王莹莹, 沙沐, 马烨璇
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Conservation Biology, Volume 39, Issue 3, June 2025.Abstract Successful long‐term conservation relies on strategic planning for pragmatic actions to mitigate threats. Prioritizing actions and areas to support conservation goals in the most cost‐effective scenario becomes crucial in resource‐limited environments. However, planning and management can be challenging in data‐limited contexts.
Anna Karolina Martins Borges +3 more
wiley +1 more source
China's Eco‐Civilisation, Climate Leviathan, and Hobbesian Energy Transition
Antipode, Volume 57, Issue 3, Page 830-861, May 2025.Abstract Scholars have hitherto tended to theorise China's ecological civilisation project either as a form of environmental authoritarianism or as a vision of eco‐socialism. This paper contributes to the conversation by conducting a textual analysis of Chinese scholarly discussions on eco‐civilisation.
David Chen
wiley +1 more source
, 2009 [[abstract]]运用政策选择实验的方法，对天津市沿海地区居民的政策需求进行了实证分析，定量地考察了海岸带环境的价值及其在不同地区和不同属性居民之间呈现的空间差异，对不同类型经济开发的空间影响强度，及海岸带开发和生态环境保护政策的效果进行了比较分析。主要研究结论包括，○1工业开发明显降低了居民的效用，说明在目前的产业结构和增长方式下，工业开发是以生态环境的破坏为代价的，需要通过产业和环境政策的统筹和协调来解决工业开发与环境承载力的矛盾。相反，渔业开发仍然会带来正面的综合效益，因此 ...
高晓路;翟国方
core
Uncovering Xi Jinping's Policy Agenda: Text As Data Approach
The Developing Economies, Volume 63, Issue 1, Page 9-46, March 2025.How many agendas has Xi Jinping put forth and promoted since taking office in 2012, and what are the types of agendas? How much of political attention has each agenda received, and how has the allocation of attention changed over time? We utilize a dataset of presidential statements, speeches, and reports from 2012 to 2022 and employed automated text ...
Jaehwan Lim, Asei Ito, Hongyong Zhang
wiley +1 more source