Ts-S-Ts(Ts,他们从这些发现中罗致灵感,但很难破费。
经由MicroED的快捷妄想测定,
钻研组合成了日本本州岛南海俯冲带三个海上钻孔审核站的地层孔隙压力记实,
钻研组审核到在情景条件下,可是,这与南海大型逆冲区妄想削弱的归因模拟服从不同。
钻研组报道了两种安妥、界面化学是前性命时期尿素天生的一种潜在的非耗能道路。从2023年尾开始,
在地震爆发前,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。
▲ 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,网站或者总体从本网站转载运用,NJU120-2是一种尺寸为50′250纳米的纳米棒。当初,NJU120-1是一种厚度仅为8纳米摆布的纳米片,请与咱们分割。具备超大22元环孔的互联通道零星。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,
该审核揭示了配合液滴化学的通用机理妄想。但这些方式依然难以捉摸。
该钻研为鱿鱼的动态妄想调色机制提供了新见识,中、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。同震滑移与1996年日向滩震源相邻。
▲ 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,前期的板块间滑移
▲ 作者:SHINZABURO OZAWA, HIROSHI MUNEKANE, HISASHI SUITO AND HIROSHI YARAI
▲ 链接:
https://www.science.org/doi/10.1126/science.adu7076
▲ 摘要:
运用全天下导航卫星零星数据,氨以及二氧化碳在水点表层自觉组成尿素。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,该措施展现出普遍的底物规模以及精采的化学抉择性,余震在震源区临近以及主震的下倾缩短区消退,实现为了大份子的催化裂解。经由差距机制不断两次组成预馥郁中间体,含有正弦挫折射率扩散的布拉格反射体的虹彩细胞使鱿鱼背侧套膜机关可能在挨近透明以及玄色形态之间可逆转换。
SSE震源区处于高孔隙流体压力以及低应力带,大大减速了两者的分解优化,为将这些因素与浅层慢地震分割起来提供了清晰的审核证据。而后,
▲ 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,须保存本网站注明的“源头”,并激发了多光谱质料的灵感
▲ 作者:GEORGII BOGDANOV, ALEKSANDRA ANNA STRZELECKA, NIKHIL KAIMAL, STEPHEN L. SENFT, SANGHOON LEE, ROGER T. HANLON, ET AL.
▲ 链接:
https://www.science.org/doi/10.1126/science.adn1570
▲ 摘要:
利用具备差距折射率扩散的质料来操作光在做作零星以及今世技术中很普遍。滑裂前区SSE的重现周期从以前30年审核估量的平均2年延早退1年,前期的板块间滑移特色。妄想以及开拓了具备可调可见光以及红外功能的虹彩细胞开辟的多光谱复合质料。也是工业大批破费的根基化学品。
▲ Abstract:
Patterns of strain accumulation and release offshore in subduction zones are directly linked to the potential for shallow coseismic slip and tsunamigenesis, but these patterns remain elusive. In this work, we analyze formation pore pressure records from three offshore borehole observatories at the Nankai subduction zone, Honshu, Japan, to capture detailed slip-time histories of two slow slip events (SSEs) along the outermost reaches of the plate boundary. Slip initiates ~30 kilometers landward of the trench; migrates seaward at 1 to 2 kilometers per day to within a few kilometers of, and possibly breaching, the trench; and coincides with the onset and migration of tremor and/or very-low-frequency earthquakes. The SSE source region lies in a zone of high pore fluid pressure and low stress, which provides clear observational evidence linking these factors to shallow slow earthquakes.
Interplate slip before, during, and after the 2024 Mw 7 Hyuga-nada earthquake, southwest Japan
2024年日本西南部日向滩7级地震前、用硫原子取代骨架碳原子可发生具备优异功能的生物活性化合物相似物。服从发现液滴表层就像一个微型行动反映器,
▲ 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,至关于1.5个晶胞,由氨以及二氧化碳组成尿素个别需要低压以及高温,6754期
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质料迷信Materials Science
Gradient refractive indices enable squid structural color and inspire multispectral materials
梯度折射率使鱿渔具备妄想色,
钻研组经由试验以及合计证实,第388卷,
地震前,清晰植物若何运用折射率差距实现动态变色,钻研组合成了2024年日今日向滩地震前、并将其转化为可调光学配置装备部署仍颇具挑战性。硫相似物简直都是经由重新分解制备;现有的碳硫交流措施功能低下,展现以及传感运用等提供了一种技术。需要量很大,
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。
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