Results 51 to 60 of about 1,350,451 (215)
四川大学学报. 自然科学版, 2008 采用SPSS11.5对多叶重楼14个居群的846个个体的形态学数据进行分析,以研究多叶重楼的形态分化规律.结果发现多叶重楼个体间形态变异较大,环境对繁殖器官和营养器官形态变化的影响大小相近;居群间形态变异与居群的地理分布有一定的关系,是环境因子和遗传因素综合作用的结果.性状的主成分分析表明,花丝长、药隔长、花瓣长、萼片及叶片形态特征对多叶重楼的形态影响较大,它们与药隔突出和花瓣宽一同作为多叶重楼种下分类的重要形态指标.
翁周, 王丽, 唐锐, 王博
doaj
Sexuality, Gender &Policy, Volume 9, Issue 4, November 2026.ABSTRACT This study explores how 2SLGBTQ+ youth in Alberta, Canada—the country's most Conservative province—mobilize queer joy as a form of resistance amid rising anti‐queer and anti‐trans policies under a settler colonial, cisheteropatriarchal regime. Drawing from youth‐produced collages, we demonstrate that this visual arts‐based participatory method
JJ Wright, Gillian Robinson
wiley +1 more source
Gaoya dianqi文中的目标是提出基于分形理论的真空击穿后电极表面微观形貌特征分析方法。首先通过雷电冲击实验获得真空击穿后棒—板电极表面的微观形貌特征，其次通过结构函数法估计电极表面的分形维数，继而根据分形维数分析电极表面的形貌特征。结果表明，分形维数可用于描述电极表面的微观形貌特征，分形维数可用结构函数法进行估计。曲面横、纵两个方向的估计分形维数基本一致，说明经过雷电冲击耐压试验后的电极表面形貌各向同性较好。板电极表面的分形维数受击穿能量大小影响，与击穿电压无明显关系。棒电极尖端表面分形维数在不同实验条件下保持一致 ...
李洪涛 +5 more
doaj
刺桐(Erythrina arborescens Roxb.)维管分生组织原形成层的发育
四川大学学报. 自然科学版, 2001 刺桐的一年生枝条 ,在距顶端约 180 μm处 ,由顶端分生组织分化出剩余分生组织 ;在距顶端约2 40 μm处 ,剩余分生组织分散形成原形成层束 .原形成层细胞向外、向内分别衍化出原生木质部和原生韧皮部 .由于原形成层细胞横分裂频率的不同 ,产生长、短两类细胞 ,短细胞与束间细胞一样 ,含有淀粉粒 .原形成层束间的基本分生组织可以分裂产生新的维管束 .
兰利琼, 逯多, 傅华龙, 包少康
doaj
Fractal analysis on protein-protein interaction networks(蛋白质互作网络的分形分析)
Zhejiang Daxue xuebao. Lixue ban, 2011 通过盒计数法，对一系列最新研究得到的蛋白质互作网络进行分形分析.研究了这些互作网络的度指数，配对系数，相关性谱等与分形性质密切相关的属性.这些分析指出，按照现有的数据构建的蛋白质互作网络很可能还不具备分形的拓扑结构.
CAOJun-jie(曹俊杰) +2 more
doaj +1 more source
The Making of the Right to Food: Tracing Food Policy Conflict and Negotiated Outcomes in Colombia
World Food Policy, Volume 12, Issue 2, November 2026.ABSTRACT The 2016 Peace Agreement between the Colombian Government and the FARC guerrilla group marked a historic step toward ending more than five decades of armed conflict. It also reshaped national food policy with lasting implications. During the negotiations, deep ideological divisions emerged between food sovereignty and food security, and these ...
Felipe Roa‐Clavijo
wiley +1 more source
, 1999 磷是湖泊营养状况的重要指标本文综述了国外对沉积物中不同形态磷的分级提取的发展概况，分析比较了各提取法的优缺点，阐述了不同形态砖的生态学意义，并总结了沉积物磷分级分析的发展趋势 ...
付永清,周易勇
core
World Water Policy, Volume 12, Issue 4, November 2026.ABSTRACT This paper describes and analyzes recharge practices in Bács‐Kiskun County, Hungary, within what can be categorized as the farmer domain. Such locally embedded aquifer recharge practices remain underexplored in Hungary. Current research and funding largely focus on large‐scale Managed Aquifer Recharge (MAR) interventions emphasizing intended ...
Helen Sundberg, Michael Gilek
wiley +1 more source
World Water Policy, Volume 12, Issue 4, November 2026.ABSTRACT This article examines how renewable‐energy expansion is changing water–energy bargaining among Iran, Iraq, and Türkiye in the Tigris–Euphrates basin. Much of the existing literature on transboundary water politics focuses on territorial control, upstream–downstream power asymmetries, legal rules, and hydro‐hegemony but gives less attention to ...
Umud Shokri
wiley +1 more source
New Phytologist, Volume 252, Issue 4, Page 1376-1395, November 2026.Osmotic stressors induce developmental and physiological changes in rice (Oryza sativa) seedlings, which are modulated by cell‐type‐specific gene expression and regulatory networks. We exposed plants to two levels of drought and salinity stress and measured the effects of these stressors on developing leaves by measuring physiological traits, ion ...
Sean M. Robertson +6 more
wiley +1 more source