Results 31 to 40 of about 7,141 (190)
, 2020 面部衰老的特征是几种皮肤的变化,但目前还不清楚这些变化是如何相互联系的,以及这些变化是如何与不同类型的面部衰老联系在一起的。
L. Pardo +6 more
semanticscholar +1 more source
Zhongguo shiyan zhenduanxue, 2021 人类的衰老是一个复杂的生理过程,时间推移以及环境作用下引起的分子、细胞和机体结构与功能的随机改变。衰老过程中肌细胞中的肌纤维核和肌原纤维条纹消失,肌纤维数量减少,线粒体数量减少,肌球蛋白ATP酶活力下降等生理生化指标发生变化,临床上表现为肌力减退,骨骼肌总重量减少等,这些现象是进行性肌肉衰老的主要表征。因此,人们提出了肌肉衰老(muscle aging)这一医学新概念。
高玮男 +4 more
doaj
, 2018 ［目的/意义］针对自动识别论文引用情感问题，提出一种基于引文内容分析的识别方法并进行可视化展示，克服基于简单引用频次计量无法区分不同引用情感的问题。［方法/过程］首先，利用正则表达式抽取出论文全文中的引文内容信息; 然后，利用 TF-IDF 算法筛选出引用情感特征词，结合情感词典，利用情感分析技术对引文内容进行引用情感识别; 最后，利用可视化工具展示出引用情感整体分布情况。［结果/结论］该方法能够有效识别出抗衰老领域论文数据集中引用情感情况。实验结果显示，该领域正面引用占总引用次数的21 ...
刘自强, 廖君华, 白如江
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Rare Metals, EarlyView.ABSTRACT The limited osteogenic capacity of magnesium phosphate cement (MPC) has constrained its biomedical applications, underscoring the necessity to develop MPC with enhanced physical properties and bone‐forming capabilities. In this study, a multifunctional MPC system was developed by incorporating zoledronic acid‐loaded near‐infrared (NIR ...
Bin Wang +8 more
wiley +1 more source
Genetic analysis and gene mapping of panicle branches stay-green trait in rice [PDF]
, 2016 水稻是重要的粮食作物之一，全球一半以上的人口以大米为主食。随着世界人口的增长，人们正面临着越来越严重的粮食危机。如何增加水稻产量一直是作物育种以及植物学研究的重要目标。近年来水稻遗传育种工作者发现了一些成熟期叶片的叶绿素不降解或仅少量降解而使叶片仍保持绿色的持绿型水稻品种，研究发现其叶片持绿性状多数属多基因控制的数量遗传，少数属隐性主效基因控制的质量性状遗传，相关基因大多已被鉴定及克隆。迄今为止，尚未见穗枝梗持绿性状的研究报道。佳辐占系本课题组育成的优质高产早稻品种，已在生产上大面积推广应用 ...
王永杰
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant phenology is crucial for understanding plant growth and climate feedback. It affects canopy structure, surface albedo, and carbon and water fluxes. While the influence of environmental factors on phenology is well‐documented, the role of plant intrinsic factors ...
Yunpeng Luo +8 more
wiley +1 more source
, 1999 从保存３个月以上的老化培养物中直接检查到游离液泡。液泡为标准圆球状，完全透明，大小相差极为悬殊，多数大型液泡吞噬了数个衰老藻细胞。采用低渗酶解，渗透冲击，低渗酶解和渗透冲击相结合，从培养３个月以上，２个月，１个月，１８ｄ，１０ｄ及３ｄ的藻丝细胞都分离到液泡。液泡略大于细胞，泡内无吞噬物。培养３ｄ的藻丝有１５％的细胞分离到液泡 ...
郭厚良,金传荫,浦秋文,宋文贞,周云珍,杨清平
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Research on English‐Medium‐Instruction (EMI) highlights inadequate support for students transitioning from L1‐medium‐instruction to EMI. To date, little research has focused on how L2 students’ adaptation to an EMI environment influences their L2 learning motivation (LLM).
Kevin W. H. Tai
wiley +1 more source
Research on the function of ANAC084 in Arabidopsis thaliana in response to the environmental stress [PDF]
, 2016 ANAC084是NAC转录因子家族的一员，其编码一个206个氨基酸的小蛋白。在拟南芥中过表达ANAC084植株出现地上部分变小，莲座叶面积变小、颜色加深，生长周期偏长的表型，但是根的发育并不受影响，进一步的研究表明过表达ANAC084会使拟南芥叶片细胞变小同时使叶片细胞数量大大减少，从而造成植株变小。但是ANAC084-RNAi和ANAC084-SRDX植株在表型上和野生型没有明显区别。通过对ANAC084Pro:gANAC084:GFP:GUS植株进行GFP扫描和GUS染色研究ANAC084的表达模式，
钟小年
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The Rhetoric of Disenchantment: Ghost Belief and Secular Critique in Early Twentieth‐Century China
Cognitive Science, Volume 50, Issue 1, January 2026.Abstract This study presents the first large‐scale empirical analysis of how ghosts and spirits were debated during China's early twentieth‐century secular transformation. Using a novel dataset of over 2000 digitized texts—including newspapers, periodicals, and essays from 1890 to 1949—we combine close reading, AI‐assisted annotation, and statistical ...
Ze Hong, Yuqi Chen
wiley +1 more source