Results 91 to 100 of about 167,960 (336)
New Phytologist, EarlyView.Summary Lignin is a key structural polymer that also serves as a potent defense against biotic stress. Herbivore‐induced, jasmonate‐dependent pith lignification in Nicotiana attenuata plays a crucial role in defense against the stem‐borer Trichobaris mucorea.
Sungjun Choung +10 more
wiley +1 more source
钢骨箱形柱内横隔板采用改良型电热熔渣焊细部及梁翼板高程差对梁柱接合抗震性能的影响
Jianzhu Gangjiegou Jinzhan, 2018 电热熔渣焊(Electro-slag Welding,ESW)为钢骨箱形柱制作柱内横隔板最有效率的焊接方法之一,因此台湾钢骨建筑结构的箱形柱构件广泛采用ESW作为柱内横隔板与柱板连接的焊接方法。由过去实尺寸梁柱接合试验研究成果发现,箱形柱内横隔板采ESW与柱板连接的梁柱接合抗震性能可靠度不佳,在未发展充分非弹性变形前发生破坏的几率较高。进一步针对ESW焊道制作与质量检测的相关研究也显示,传统ESW焊道的制作与检测质量仍有改善空间,并提出喇叭形扩大孔的ESW熔池改良细部 ...
林克强 +5 more
doaj
Jianzhu Gangjiegou Jinzhan, 2021 为研究盖板式外加强环圆钢管柱-H形钢梁节点的破坏特征和抗震性能,设计了柱径厚比、柱环径厚比、柱梁径宽比及梁腹板高厚比四类参数,通过ABAQUS软件对其进行有限元分析,探讨各参数对节点破坏模态、滞回曲线、骨架曲线、刚度退化、延性性能及耗能能力的影响。结果表明,该类节点破坏模态受各参数变化的影响,在节点核心区剪切破坏和梁端塑性铰破坏之间转变;节点的滞回曲线饱满,具有较好的延性和较强的能量耗散能力;骨架曲线、刚度退化受柱径厚比的影响显著;节点的极限承载力随着柱径厚比 ...
徐培蓁, 陈超, 杨雷, 朱亚光
doaj
New Phytologist, EarlyView.Summary Climate warming is predicted to strongly affect the functioning of terrestrial ecosystems. The plant root system is a critical component of these ecosystems, with fine roots, in particular, playing a key role in plant water and nutrient uptake and transport.
Steve Kwatcho Kengdo +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2022 在钢管混凝土内部填充部分木芯能够在不大幅降低钢管混凝土柱承载力的情况下，有效减轻钢管混凝土柱的自重。采用ABAQUS有限元软件建立内填木芯钢管混凝土短柱实体模型，研究了不同含木率、木芯截面形状、钢管截面形式和钢管壁厚等参数对内填木芯钢管混凝土短柱轴压性能的影响。结果表明：一定范围内，内填木芯使得钢管混凝土短柱的承载力有所下降，但是柱的强重比却逐渐增大；木芯的截面形式对柱的承载力总体上影响较小。同时借鉴约束钢管的本构关系，提出内填木芯钢管混凝土轴压短柱承载力的简化计算式 ...
荣秀强, 凌志彬
doaj
, 1989 1983—1984年,测定了东湖水柱总沉降颗粒有机物中的碳、氮、磷、叶绿素a含量和浮游动物数量,以及该湖浮游动、植物优势种的干重/湿重、C/N及C/P比值。利用所得数值计算出其颗粒有机碎屑的沉降速率。东湖这两年的颗粒有机碎屑的沉降速率[g/m~2·a),Ⅰ站分别为10.67与10.97(碳),2.15与2.68(氮)及0.29与0.30(磷);Ⅱ站分别为10.35与7.26(碳),2.17与1.12(氮)及0.22与0.16(磷)。与水柱浮游植物净生产量相比 ...
林婉莲,刘鑫洲
core
Transgressive segregation affects essential oil composition in a model mint population
New Phytologist, EarlyView.
B. Markus Lange +11 more
wiley +1 more source
The role of VND transcription factors in xylem vessel development and secondary wall formation
New Phytologist, EarlyView.Summary Transitioning from aquatic to terrestrial life required specialized vascular tissues, with xylem enabling water transport and structural support. Vascular‐related NAC (NAM, ATAF1/2, CUC2) domain (VND) transcription factors regulate xylem development by orchestrating secondary cell wall biosynthesis and programmed cell death.
Ulrike Lehmann, René Schneider
wiley +1 more source
New Phytologist, EarlyView.Summary Plasmids contribute to the efficient adaptation of bacteria to specific niches in nature. The gram‐positive bacterium Clavibacter michiganensis carries two plasmid‐borne important virulence genes, celA and pat‐1, necessary for wilting in tomato. The 88 C.
In Sun Hwang +8 more
wiley +1 more source