The ancestors could have chosen 1/1 the mass of a hydrogen atom, or 1/16 of an oxygen atom, or 1/59 of a cobalt atom, 1/232 of a thorium atom... Choosing an element that consists essentially of a single isotope makes sense. Then, as nucleons don't weigh exactly as much in all...
混合物 mixture 相对原子质量 relative atomic mass(abbr. Ar) 相对分子质量 relative molecular mass (abbr. Mr) 化学式量 relative formula mass 物质的量 amount of substance 阿伏加德罗常数 Avogadro constant (abbr. NA) 摩尔mole 摩尔质量 molar mass 实验式/最简式/经验式 empirical formula 气体摩尔体积 mol...
Domesticated species are impacted in unintended ways during domestication and breeding. Changes in the nature and intensity of selection impart genetic drift, reduce diversity, and increase the frequency of deleterious alleles. Such outcomes constrain our ability to expand the cultivation of crops into e...
CEC content was measured using the standard method “Determination of Cation Exchange Capacity (CEC)—Hexamminecobalt Trichloride Solution—Spectrophotometric Method (HJ 889–2017)” [25]. OM content was measured using the standard method “Determination of Organic Carbon—Potassium Dichromate Oxidation ...
coating deposition was measured by an atomic force microscope (NT-MDT). The transmission spectra of the sample were measured at normal incidence using the setup shown inFigure 1. A collimated beam from a white light source (XWS-65, ISTEQ, Eindhoven, The Netherlands) passed through an aperture...
A Pananalytical XPert Pro instrument with a cobalt tube at a voltage of 35 kV and a current of 45 mA was used. During the measurement, the samples were either kept at low relative humidity (5% RH, silica gel) or in laboratory air (40% RH). 57Fe Mössbauer measurements were carried ...