化学键是将两个原子结合起来的吸引力。 Chemical bonds can form by the attraction between the positive nucleus of one atom and the negative electrons of another atom, or by the attraction between positive ions and negative ions. This chapter discusses chemical bonds formed by ions, atoms that have...
ion是带电荷的一种粒子，它的存在是由于atom/molecule得到或者失去electron(也可是proton，但比较少)时而令atom/molecule中的正负电荷失衡，得到净正或负电荷，而ion的stable状态只会在水溶液中出现。如金属K(potassium)，它与水反应后会令每粒K atom失去一粒electron，最后得出K+(potassium ion)。 1 mol...
Equilibria formed during sodium/potassium ion exchange between a salt melt and a soda–lime–silica glass as well as a sodium aluminosilicate glassAn industrially produced soda–lime–silica and an industrially fabricated sodium aluminosilicate were treated in salt melts with different NaNO/KNOratios ...
which is responsible for mounting an interference response that prevents virus replication to regulate infection and disease. Potassium (K+) ion flux regulates antiviral immunity in mammals through inflammasomes, antiviral apoptosis, and RNAi pathways [22,23,62,63]. The mechanism by which K+ions...
a single calcium ion binds at the selectivity filter narrow constriction formed by aspartates D541 and allows Na+permeation. In the presence of ions, no water binds to or crosses the pore constriction. At high Ca2+concentrations, calcium permeates the pore according to the knock-off mechanism ...
An electrostatic trap is formed as anions enter the large entrance while they cannot exit the tip (positive external voltages). However, the nanochannel shows high ion currents with no trap when the anode is on the tip side; the negative charge of the inner surface rejects the anion (...
Determination of the distribution of sodium and potassium ion activated adenosinetriphosphatase among the various oligomers formed in solutions of nonionic... Sodium and potassium ion activated adenosinetriphosphatase [(Na+ + K+)-ATPase] can be dispersed from the membrane-bound state, with the stable...
A method is described for predicting the sodium, potassium and hydroxyl ion concentrations in the pore solutions of hydrated OPC or Portland-pfa (pulverized-fuel ash, fly ash) concretes, mortars or pastes more than about 1 day old. The minimum data required are the total Na//2O and total ...
36. The membranes were formed by drop-casting 50 μL of pre-prepared mixtures (see “Methods” section) onto the graphene through the PCB opening and left to dry overnight in ambient conditions. The membrane creates a seal between the graphene surface and PCB. Two component epoxy was ...
A method for determining nitrogen-dioxide concentrations in the 0.01 weight % range and above uses ultraviolet absorption at 355 mμ of the nitrite ion formed when nitrogen dioxide is absorbed in aqueous alkaline solutions of potassium or sodium hydroxide. The absorption maximum of nitrite ion at ...