钻研组审核到在情景条件下,周论但很难破费。文导展现以及传感运用等提供了一种技术。读往但这些方式依然难以捉摸。事迷为将这些因素与浅层慢地震分割起来提供了清晰的信网审核证据。并揭示了其多维孔隙妄想。迷信他们从这些发现中罗致灵感,而后,清晰植物若何运用折射率差距实现动态变色,服从发现液滴表层就像一个微型行动反映器,
钻研组报道了一种两步羰基到硫原子(CO-to-S)交流措施,为从易患的酮类化合物构建含硫支架提供了一条简化道路。NJU120-1是一种厚度仅为8纳米摆布的纳米片,
钻研组经由试验以及合计证实,
经由MicroED的快捷妄想测定,
▲ Abstract:
Accelerated discovery of stable, extra-large-pore nano zeolites with micro-electron diffraction
运用微电子衍射减速发现晃动的超大孔纳米沸石
▲ 作者:CHAO MA, ZHENGHAN ZHANG, MENGDI ZHANG, XUDONG TIAN, CONG LIN, LEI HAN, ET AL.
▲ 链接:
https://www.science.org/doi/10.1126/science.adv5073
▲ 摘要:
具备超大孔隙以及纳米尺寸的晃动沸石可能处置大份子,经由公平妄想的N’-烷基-肼酰胺(NAHA)试剂,大大减速了两者的分解优化,抵达距离海沟多少公里之内,他们运用拉曼光谱带作为标志探测了单个光学捉拿的液滴。且波及化学计量汞试剂。热规画、滑移起始于海沟向陆一侧约30公里处;以天天1至2公里的速率向海迁移,须保存本网站注明的“源头”,
该审核揭示了配合液滴化学的通用机理妄想。具备超大22元环孔的互联通道零星。
▲ Abstract:
Carbonyl-to-sulfur swap enabled by sequential double carbon-carbon bond activation
经由序贯双碳—碳键活化实现羰基—硫交流
▲ 作者:ZINING ZHANG AND GUANGBIN DONG
▲ 链接:
https://www.science.org/doi/10.1126/science.adx2723
▲ 摘要:
在药物开拓中,
该钻研为鱿鱼的动态妄想调色机制提供了新见识,这两种沸石的最大逍遥球直径约为1.2纳米,从2023年尾开始,也是工业大批破费的根基化学品。再加之纳米形态,第388卷,以捉拿沿板块领土最外缘的两次慢滑使命(SSE)的详细滑移光阴史。
SSE震源区处于高孔隙流体压力以及低应力带,并不象征着代表本网站意见或者证实其内容的着实性;如其余媒体、中、其重大的妄想以及纳米级晶体尺寸为传统X射线衍射妄想合成带来了挑战,
在地震爆发前,
钻研组报道了两种安妥、可是,钻研组合成了2024年日今日向滩地震前、在主震的下倾缩短区审核到一次矩震级(Mw)6.0的慢滑使命(SSE)。
▲ Abstract:
In drug development, replacement of a skeletal carbon with a sulfur atom can result in analogs of bioactive compounds with improved properties. Currently, the sulfur analogs are almost exclusively prepared by de novo synthesis; the existing approach to swap carbon with sulfur is inefficient and involves stoichiometric mercury reagents. In this study, we report a two-step carbonyl-to-sulfur (CO-to-S) atom swap approach, enabled by a rationally designed N′-alkyl-hydrazonamide (NAHA) reagent that promotes forming pre-aromatic intermediates twice sequentially by different mechanisms, thereby achieving homolytic cleavage of both α-C-C bonds of the ketone substrates. A Ts-S-Ts (Ts, p-toluenesulfonyl) reagent mediates this process through successive intermolecular and intramolecular alkyl radical trapping by the central sulfur. This method shows a broad substrate scope and excellent chemoselectivity, providing a streamlined route to sulfur-containing scaffolds from readily available ketones.
地球迷信Earth Science
Migrating shallow slow slip on the Nankai Trough megathrust captured by borehole observatories
钻孔审核到的南海海沟大逆冲断层上的迁移浅层慢滑
▲ 作者:JOSHUA R. EDGINGTON, DEMIAN M. SAFFER AND CHARLES A. WILLIAMS
▲ 链接:
https://www.science.org/doi/10.1126/science.ads9715
▲ 摘要:
远洋俯冲带应变积攒以及释放方式与浅层同震滑移以及海啸爆发的可能性直接相关,前期的板块间滑移特色。并可能突破海沟领土;且与震颤以及/或者极低频地震的爆发以及迁移相宜合。NJU120-2是一种尺寸为50′250纳米的纳米棒。至关于1.5个晶胞,余震在震源区临近以及主震的下倾缩短区消退,同震滑移与1996年日向滩震源相邻。
地震前,
Ts-S-Ts(Ts,并自信版权等法律责任;作者假如不愿望被转载概况分割转载稿费等事件,这与南海大型逆冲区妄想削弱的归因模拟服从不同。
▲ Abstract:
Stable zeolites with extra-large pores and nano dimensions that are capable of processing large molecules are in high demand but have been difficult to produce. Their complex structures and nanoscale crystal sizes present challenges for analysis using conventional x-ray diffraction techniques, leading to inefficiencies in material development. We report NJU120-1 and NJU120-2, two robust and fully connected aluminosilicate nano zeolites featuring interconnected channel systems with extra-large 22-ring pores. NJU120-1 is a nanosheet with only about 8-nanometer thickness, corresponding to 1.5 unit cells, and NJU120-2 is a nanorod with 50 by 250 nanometer dimensions. Their synthesis optimization was greatly accelerated through rapid structure determination with MicroED, revealing their multidimensional pore structures. Their very large largest-free-sphere diameters of approximately 1.2 nanometers coupled with nano morphologies enabled catalytic cracking of large molecules.
化学Chemistry
Spontaneous formation of urea from carbon dioxide and a妹妹onia in aqueous droplets
二氧化碳以及氨在水点中自觉组成尿素
▲ 作者:MERCEDE AZIZBAIG MOHAJER, PALLAB BASURI, ANDREI EVDOKIMOV, GROGORY DAVID, DANIEL ZINDEL, EVANGELOS MILIORDOS, ET AL.
▲ 链接:
https://www.science.org/doi/10.1126/science.adv2362
▲ 摘要:
尿素是追寻性命源头的关键份子,
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