Results 111 to 120 of about 71,844 (252)
Uncovering correlates of decline and critical refuges for a threatened terrestrial mammal
Conservation Biology, EarlyView.Abstract Globally, the geographic ranges of numerous species are contracting. Identifying spatiotemporal patterns of threat impact can illuminate why species decline in some parts of their range but persist in others. We developed a correlative approach to identify species’ response thresholds and locate ecological refuge areas associated with ...
Natalya M. Maitz +5 more
wiley +1 more source
Scientists’ warning on the global destruction of rock outcrop ecosystems
Conservation Biology, EarlyView.Abstract Rock outcrops are geological formations that harbor a highly specialized biota adapted to harsh environmental conditions that differ from their surrounding landscapes. They are globally distributed, especially in old, highly weathered landscapes, and can function as habitat islands containing high levels of endemism and distinct evolutionary ...
Luiza F. A. de Paula +19 more
wiley +1 more source
Shuitu Baochi Xuebao, 2005 在酸性红壤上，土壤有效磷含量低，大部分磷以难溶性磷形式存在，这是影响作物生产的重要限制因素之一。作物根分泌物活化难溶性磷的能力对改善其磷素营养具有重要意义。本文系统研究了大豆根分泌物对难溶性铝磷的活化效果，同时运用阴、阳离子交换树脂将根分泌物分成阴离子组分、中性组分和阳离子组分，活化结果表明．阴离子组分对铝磷的活化量显著高于中性组分和阳离子组分。运用分子膜把根分泌物分成大于8K、8～3．5K、3．5～1K和小于1K组分．发现对铝磷活化量最大的组分为小于1K根分泌物组分。另外 ...
沈宏 菊井森士 严小龙 松本英明
doaj
Twelve principles for successful governance of community‐based coastal marine restoration
Conservation Biology, EarlyView.Abstract Global agreements, such as the Global Biodiversity Framework, call for urgent, large‐scale action to halt biodiversity loss through a whole‐of‐society approach. Community‐based restoration can play a crucial role in achieving this goal, yet there remains limited understanding of what makes these projects effective and sustainable.
Michelle M. Holian +2 more
wiley +1 more source
, 2019 目的利用人胚胎干细胞(hESCs)诱导向肝细胞分化,不但可为肝病治疗提供种子细胞,还对了解肝组织的分化、发育和再生等具有重要意义。当前多使用基于生长因子或者小分子的分化策略,所得的肝细胞成熟度和功能性有限。由于具有生物相容性的无机盐离子可调控多种干细胞的分化,故本研究采用一种基于硅酸钙(CS)的无机纳米粒子,探索其浸提液对人胚胎干细胞肝向分化的影响。方法使用优化的ESCs肝向分化四阶段诱导方案,即干细胞(STEM)、确定内胚层(DE)、前体肝细胞(Pre-H)和成熟肝细胞(M-H)。采用高 ...
吕东媛 +7 more
core
Shuitu Baochi Xuebao, 2017 基于田间大棚试验，采用等量养分原则，分析生物有机肥、蚯蚓粪、鸡粪等不同有机肥部分替代化肥对西瓜生长、产量、品质以及养分利用的影响。结果表明，与单施化肥相比，有机肥部分替代化肥均不同程度提高了西瓜叶绿素含量、光合性能、产量及品质，其中以蚯蚓粪与化肥配施效果最佳，其光合性能显著高于单施化肥，产量提高了33.63%，可溶性糖、可溶性蛋白及维生素C含量分别增加了14.07%，14.47%和17.52%。有机肥部分替代化肥施肥处理的肥料利用率高于单施化肥，土壤养分元素依存率低于单施化肥 ...
蒲瑶瑶 +8 more
doaj
Conservation Biology, EarlyView.Abstract Ecological niche models (ENMs) are used to assess the abiotic preferences of species by linking their occurrences to the environmental conditions in which they live. We developed a fossil‐informed ENM framework that integrates mid‐Holocene and modern occurrences to test niche stability and reconstruct abiotic niche characteristics for four ...
Claire. M. Williams +3 more
wiley +1 more source
, 2011 本研究目的為瞭解大學生自我分化、壓力感受與身心健康之間的關係。主要想探討一、大學生自我分化、壓力感受與身心健康之狀態；二、大學生自我分化與身心健康的關係；三、壓力感受在自我分化與身心健康關係中的角色。 本研究為問卷調查法，採用「大學生自我分化量表」、「日常瑣事量表」與「一般健康量表」為研究工具，以立意抽樣的方式選取北部地區大學生為研究對象，有效樣本為584名。調查所得資料以描述統計、積差相關與階層迴歸進行統計分析。 本研究主要發現如下： 一、大學生自我分化量表是一具有信效度 ...
馬承逸
core
Psychometric framework for coexistence with large carnivores
Conservation Biology, EarlyView.Abstract Human–carnivore coexistence is essential for biodiversity conservation, yet measuring the attitudes and behaviors that support it remains methodologically challenging. We developed psychometric scales to assess willingness to coexist with carnivores and the underlying beliefs of this coexistence through an iterative expert elicitation process ...
Benjamin Ghasemi +14 more
wiley +1 more source
成人の生体には，分化度の異なる状態の幹細胞が存在しており，それらは分化系列子孫を生みだすために非常に異なる分化能を持つ多数の幹細胞が存在している。自己維持のための能力は，全ての幹細胞の基本的で共通の特徴である。大規模な自己維持能力を持つ細胞集団が,全ての幹細胞に適用される唯一の定義である。肝臓システムは，１方向性分化能を持つ肝細胞システムと多分化能を持つ非実質上皮性細胞（胆管）システムという２つの幹細胞システムで組み立てられると考えられる。肝臓腫傷の発生過程でも ...
Sugiyama, Toshihiro, 杉山, 俊博
core