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作者：Almallahi, Rawan; Wortman, James; Linic, Suljo
作者单位：University of Michigan System; University of Michigan; University of Michigan System; University of Michigan
摘要：Propylene production through propane dehydrogenation (PDH) is endothermic, and high temperatures required to achieve acceptable propane conversions lead to low selectivity and severe carbon-induced deactivation of conventional catalysts. We developed a catalyst-membrane system that removes the hydrogen by-product and can thus achieve propane conversions that exceed equilibrium limits. In this codesigned system, a silica/alumina (SiO2/Al2O3) hollow-fiber hydrogen membrane was packed with a sele...
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作者：Brainard, Jeffrey
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作者：Jo, Myung Hyun; Meneses, Paul; Yang, Olivia; Carcamo, Claudia C.; Pangeni, Sushil; Ha, Taekjip
作者单位：Harvard University; Harvard University Medical Affiliates; Boston Children's Hospital; Program in Cellular & Molecular Medicine (PCMM); Harvard University; Harvard Medical School; Johns Hopkins University; Johns Hopkins University; Howard Hughes Medical Institute
摘要：Cells connect with their environment through surface receptors and use physical tension in receptor-ligand bonds for various cellular processes. Single-molecule techniques have revealed bond strength by measuring rupture force, but it has long been recognized that rupture force is dependent on loading rate-how quickly force is ramped up. Thus, the physiological loading rate needs to be measured to reveal the mechanical strength of individual bonds in their functional context. We have developed...
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作者：Wadman, Meredith
摘要：Can the course of fatal prion diseases be changed by removing the protein before it goes bad?
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作者：Brainard, Jeffrey
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作者：Brainard, Jeffrey
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作者：Chen, Ruizhe; Intermaggio, Nicholas E.; Xie, Jiaxin; Rossi-Ashton, James A.; Gould, Colin A.; Martin, Robert T.; Alcazar, Jesus; MacMillan, David W. C.
作者单位：Princeton University; Johnson & Johnson; Johnson & Johnson Spain
摘要：Alcohols represent a functional group class with unparalleled abundance and structural diversity. In an era of chemical synthesis that prioritizes reducing time to target and maximizing exploration of chemical space, harnessing these building blocks for carbon-carbon bond-forming reactions is a key goal in organic chemistry. In particular, leveraging a single activation mode to form a new C(sp(3))-C(sp(3)) bond from two alcohol subunits would enable access to an extraordinary level of structur...
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作者：Rupprechter, Gunther
作者单位：Technische Universitat Wien
摘要：Surface science defies the complexity of ammonia synthesis At least 80% of the ammonia produced industrially supports crop growth around the world. Its synthesis, at scale, from nitrogen and hydrogen gas rests on the Haber-Bosch process, which requires high temperature (400 degrees to 500 degrees C), high pressure (150 to 200 bar), and an iron (Fe)-based catalyst whose performance is promoted by potassium-oxide and other oxides (1). However, ammonia production requires high energy and is the s...
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作者：Yang, Chenyujing; Mao, Kuoray; Liang, Xiaomeng; Xue, Yongji
作者单位：Beijing Forestry University; Colorado State University System; Colorado State University Fort Collins
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作者：Voosen, Paul
摘要：Plans for Perseverance to explore past crater rim may be in jeopardy
