Results 51 to 60 of about 38,844 (178)
Zhongshan Daxue xuebao. Yixue kexue ban, 2002 【目的】研究地理因素对水蛭素基因结构变异的影响。【方法】抽提广东菲牛蛭基因组DNA , 根据已发表的水蛭 素基因设计一对引物, 从基因组DNA 扩增出一特异性的大约700 bp 片段, 再回收、克隆和测序。【结果】广东菲牛蛭水蛭素 基因全长为642 bp, 基因有4 个外显子, 被三个内含子隔开。与马尼拉菲牛蛭水蛭素基因Hm1 、Hm2 的同源性分别为90 %与 和88.6 %。【结论】地理因素会影响菲牛蛭水蛭素基因结构的变异。
谭恩光, 刘秀平
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Distribution, scale, and drivers of mass mortality events in Europe's freshwater bivalves
Conservation Biology, Volume 40, Issue 2, April 2026.Abstract Mass mortality events (MMEs) are decimating populations and compromising key ecosystem functions around the globe. One taxon particularly vulnerable to MMEs is freshwater bivalve mollusks. This group has important ecosystem engineering capacities and includes highly threatened and highly invasive taxa.
Daniel A. Cossey +39 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2015 以浙南洞头沿海海域的一次赤潮过程为例，对其爆发过程中气象因素影响特征进行了分析，重点分析了气象要素、天气形势对洞头沿海赤潮发生过程的影响.分析表明：气象因素对赤潮灾害的发生和消亡有较大影响，特别是气温、降水、风和气压等的影响作用十分明显，对赤潮的发生、发展起到重要作用.而此次过程中，风的要素对赤潮过程的影响最为突出.同时高空环流形势的转折变化，也直接影响这次赤潮过程的发生、发展.当环流形势稳定时，赤潮生物的海洋生存环境就稳定，赤潮得以持续；反之，当大气环流状态改变时，赤潮发生、发展过程也会受到影响.
FUshenghui(符生辉) +4 more
doaj +1 more source
How much biotic nativeness matters across human demographic groups
Conservation Biology, Volume 40, Issue 2, April 2026.Abstract Many central concepts of conservation biology—such as nativeness—are structured by ecological and social factors. However, the social consequences of using these concepts to make conservation decisions remain inadequately understood. Some researchers argue that nativeness, rather than acting as an objective proxy for important ecological ...
Harold N. Eyster, Rachelle K. Gould
wiley +1 more source
保证美标57—2线路柱式绝缘子瓷件总高尺寸公差的措施 附视频
Dianci bileiqi, 1996 介绍了坯件湿修高度方向尺寸放尺率的确定及验证过程；讨论了影响坯件湿修总高尺寸误差的主要因素；分析了坯件收缩率变化对瓷件总高尺寸的影响，以及影响收缩率变化的主要因素；最后根据以上影响因素确定了坯件湿修总高尺寸公差及保证其尺寸公差所应采取的措施。
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Zhongguo shiyan zhenduanxue, 2006 目的研究乳腺磁共振成像（Magnetic resonance imaging,MRI）弥散加权像（diffusion-weighted image,DWI）中表观弥散系数（apparent diffusion coefficient,ADC）的影响因素。方法对照病理分析32例乳腺疾病患者的42个ADC值异常的感兴趣区,分析ADC的相关影响因素。结果乳腺间质成分百分比与ADC值呈正比趋势,随间质百分比的增加ADC值增加。肿瘤组织内出血、坏死及间质成分中纤维细胞排列的疏密对ADC有明显影响 ...
赵继红 +5 more
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Genomic responses to increased temperature and pollinator selection in Brassica rapa L.
New Phytologist, Volume 250, Issue 2, Page 1231-1247, April 2026.Summary Rapid environmental change reshapes both abiotic stress and biotic interactions, yet it remains unclear how these combined forces structure plants' genomic adaptation. In particular, the joint influence of temperature and pollinator identity, two ecological axes undergoing simultaneous global shifts, has rarely been quantified at genomic ...
Yanqian Ding, Florian P. Schiestl
wiley +1 more source
Survey of sleep quality of 320 cases of liver cirrhosis patients and its influencing factors
Huli yanjiu, 2015 [目的]了解肝硬化病人的睡眠质量及影响因素,提出针对性的意见或建议。[方法]采用匹兹堡睡眠质量指数（PSQI）和自行设计的影响睡眠因素调查表对320例肝硬化住院病人进行问卷调查。[结果]320例肝硬化住院病人PSQI大于7分者248例（77.5%）。主要影响睡眠的因素为心理因素、住院环境以及疾病所带来的身体不适。[结论]肝硬化住院病人PSQI评分高于正常人,睡眠障碍具有普遍性和特殊性,应引起医护人员的足够重视。
李宁珍, 蒙凯, 徐颖霞
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Politics &Policy, Volume 54, Issue 2, April 2026.ABSTRACT The Great Depression was a turning point in the development of social programming in North America. This paper explores the politics of social policy expansion during the Great Depression in the United States and Canada through an analytical lens that combines the insights of historical institutionalism and the analysis of transnational ...
Daniel Béland +2 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2021 目的探讨患者个体因素对低剂量胸部CT显像质量的影响,以期为个性化扫描参数优化提供参考。方法随机抽取2020年1月-2020年6月于徐州医科大学附属医院影像科行低剂量胸部CT检查的患者124例作为研究对象,采用自制的一般资料调查表,收集患者的性别、年龄、体质指数(BMI)、胸廓前后径与横径比、胸围等。同时,由3名中级职称以上影像医师对CT显像质量进行评价,并采用单因素分析及多因素分析法分析患者因素对低剂量胸部CT显像质量的影响。结果单因素分析结果显示,患者的性别、年龄、体质指数、胸廓前后径与横径比 ...
曹栋栋, 胡春峰
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