1. The positive charge of an atom is concentrated in the nucleus, which was assumed to be present in the center.2. Clouds of electrons orbit the nucleus.3. Most of the atom’s volume lies between tiny nucleus and cloud of electrons....
aAccording to this model, all positive charge of a given atom, with approximately 99% of its mass, would be concentrated in the atomic nucleus. 根据这个模型,一个特定原子的所有正电荷,与大约99%它的大量,在原子核将被集中。[translate]
What is the origin of the oxygen we breathe, the hydrogen and oxygen (in form of water H2O) in rivers and oceans, the carbon in all organic compounds, the silicon in electronic hardware, the calcium in our bones, the iron in steel, silver and gold in jewels, the rare earths utilized,...
Thomas Graham (1805-1869) is known as the founder of colloidal chemistry and for his fundamental research on the nature of phosphoric acid and phosphates, diffusion of gases, liquids, and solutions, adsorption of gases by metals, dialysis, osmosis, mass transfer through membranes, and the constit...
Soot generation is a major challenge in industries. The elimination of soot is particularly crucial to reduce pollutant emissions and boost carbon conversion. The mechanisms for soot oxidation are complex, with quantified models obtained under in situ co
Partitioning of lugdunin in POPC membranes As lugdunin exerts its mechanism of action by targeting the cell membrane12, peptide partitioning is an utmost important parameter governing its antimicrobial efficiency. To quantify the partitioning of lugdunin between the water and the membrane phase and its...
[60]. If the polymer's hydrophilic segment acted like a rod, the particle size would increase dramatically with the molecular weight of the polymer. However, if the polymer wraps around the lipid membrane segment, changes in the molecular weight of the polymer with the same total mass of ...
The simplest possible atom (and the most common one in the Sun and stars) is hydrogen. The nucleus of ordinary hydrogen contains a single proton. Moving around this proton is a single electron. The mass of an electron is nearly 2000 times smaller than the mass of a proton; the electron ...
A second key developmental regulator, the sporulation-specific σ-factor WhiG, is also controlled by c-di-GMP. The anti-σ-factor RsiG sequesters WhiG in an inactive complex which is stabilized by a dimer of c-di-GMP35. Interestingly, in Streptomyces coelicolor, WhiG has been proposed to ...
Apiose is a natural pentose containing an unusual branched-chain structure. Apiosides are bioactive natural products widely present in the plant kingdom. However, little is known on the key apiosylation reaction in the biosynthetic pathways of apiosides. In this work, we discover an apiosyltran...