Results 41 to 50 of about 1,490,657 (168)
The incredible vulnerability that reproduction poses for plant species in a warming world
Generalized plant responses to heat stress across whole‐plant and reproductive scales. Summary Temperatures are rising globally and threatening the persistence of natural plant populations. Elevated temperatures disrupt gametogenesis, fertilization, and seed filling, often at lower thresholds than those affecting photosynthesis, growth, or survival ...
Derek A. Denney +4 more
wiley +1 more source
The richness, frequency and relatedness components of mate diversity and mate portfolios
The effects of (a) equal and (b, c) unequal contributions to mate portfolios by 10 mates on (d) Hill‐number mate diversity profiles (see Eqn 1). Summary Sexual reproduction produces genetically diverse families, especially when individuals mate with multiple partners.
Lawrence D. Harder, Mason W. Kulbaba
wiley +1 more source
本发明涉及一种用于制备氮杂环化合物金属盐和氮杂环化合物金属盐杂环化合物配合物的合成方法。在无溶剂的条件下,将氮杂环化合物与相应的金属氢化物混合球磨,从而得到相应的氮杂环化合物金属盐;在无溶剂的条件下,将一定比例的氮杂环化合物、相应的金属氢化物和杂环化合物配体的混合物球磨,或者将氮杂环化合物金属盐与一定量的杂环化合物配体混合物球磨,从而得到氮杂环化合物金属盐杂环化合物配合物。球磨温度一般在-100℃至300°C之间,转速一般为10转每分钟至500转每分钟之间,球磨时间一般控制在1小时至300小时之间 ...
何腾 +4 more
core
自从Pederson[1]发现冠醚可以和碱金属盐形成配合物以来,已有许多种金属和冠醚配合物的报道,但有关冠醚和过渡金属锰(Ⅱ)形成配合物的报道较少[2~4].我们通过实验发现,冠醚可以和硫氰酸盐溶液中的锰(Ⅱ)形成配合物并被萃取入有机相.现就不同种类...
陈明生, 许盛昌
doaj
ABSTRACT Due to their exceptional porosity, structural versatility, and modular coordination chemistry, metal–organic frameworks (MOFs) have emerged as versatile platforms for targeted drug delivery. These structures enable fine‐tuning of pore size, surface activity, and framework stability for the encapsulation of a broad range of therapeutics ...
Rui Hua +9 more
wiley +1 more source
本发明公开了一种壳寡糖-稀土配合物及制备和应用,由稀土离子与壳寡糖上的氨基和/或羟基配位健合而成,稀土元素于配合物上的键合总质量0.1-18%,所述壳寡糖的平均分子量在300~6000Da,脱乙酰度为50%~100%。本发明配合物中稀土元素含量可控,可准确计量施用,控制和极大减少稀土施用量,从而提高了农用稀土的安全性。同时该配合物又能有效降低作物和土壤中的农药残留(降解率90%以上)。它是一种迄今尚未开发的同时具有植物营养、诱抗(生物农药),促进生长和清除农药残留环境友好的新型生物农用剂。制备过程简单 ...
孟令玗 +5 more
core
ABSTRACT The demand for advanced aerospace components necessitates near‐α titanium alloys with enhanced high‐temperature performance and compatibility with additive manufacturing (AM). To address this, an in situ alloying strategy was employed to co‐modify a Ti‐6.5Al‐2Zr‐Mo‐V alloy with Si and Y during laser powder bed fusion.
Zishuo Ma +10 more
wiley +1 more source
本发明涉及一种新型单线态氧铕荧光探针及其应用,是以三价铕离子Eu3+与含有功能性基团的2,2’:6’2”-联三吡啶骨架结构类配位体形成的配合物,其中所述配位体结构式为: ∴R=H,CnH2n+1,C6H5 。这类配合物可通过其功能性基团与单线态氧作用,使配合物的荧光强度发生很大的变化,进而用于单线态氧的荧光测定 ...
宋 波, 袁景利, 王桂兰
core
碘化4′-(ω-羧基壬酰基)苯并15-冠-5合钠的合成及表征
′ (ω 羧基壬酰基)苯并15 冠 5(L)的丙酮溶液与碘化钠的丙酮溶液作用,得到了配合物Na+L·I-晶体.配合物的1HNMR与自由配体冠L的1HNMR谱相比较,ArH和OCH2的δ向低场移动了0.01~0.05ppm.比较二者的IR,配合物冠环上的C-O-C和Ar-O-C的振动频率向低波数方向移动了7~46cm-1.并对配合物的成键性能进行了初步讨论.
万家义 +3 more
doaj
ABSTRACT Advanced metallic glasses, leveraging their ultrahigh strength, excellent corrosion resistance, superior soft magnetic properties and good biocompatibility, have gradually become indispensable strategic cornerstones in critical fields such as aerospace, electronic information and energy power. This unique combination of properties enables them
Yizhou Liu +11 more
wiley +1 more source

