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Hace 6 días · Calibration-free reaction yield quantification by HPLC with a machine-learning model of extinction coefficients M. A. McDonald, B. A. Koscher, R. B. Canty and K. F. Jensen, Chem. Sci., 2024, Advance Article , DOI: 10.1039/D4SC01881H This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
14 de may. de 2024 · 14 min read. Superheavy Elements Are Breaking the Periodic Table. Extreme atoms are pushing the bounds of physics and chemistry. By Stephanie Pappas. Quarternative. June 2024 Issue. Basic...
16 de may. de 2024 · Combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame. Combustion is one of the most important of chemical reactions and may be considered a culminating step in the oxidation of certain kinds of substances.
Hace 2 días · Extinction is the termination of a taxon by the death of its last member.A taxon may become functionally extinct before the death of its last member if it loses the capacity to reproduce and recover. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a ...
Hace 6 días · Gas-liquid-solid (G-L-S) catalytic reactions are widespread in the chemical and pharmaceutical industries and in environmental chemistry (1, 2).The reactions are conditioned by the very low gas solubility in liquids (according to Henry’s law) and from poor mass/heat transfer of reactants/products to/from the catalyst surface due to the physical separation of the phases and the low G-L– and ...
Hace 3 días · The scientific consensus is that the main cause of extinction was the flood basalt volcanic eruptions that created the Siberian Traps, [19] which released sulfur dioxide and carbon dioxide, resulting in euxinia (oxygen-starved, sulfurous oceans), [20] [21] elevating global temperatures, [22] [23] [24] and acidifying the oceans.
Hace 1 día · June 3, 2024. Field camp on Errant Glacier in the central Transantarctic Mountains. Credit: John Goodge. Over 500 million years ago, life on Earth was booming during the Cambrian explosion ...
