While some redox couples (e.g., catecholics) can spontaneously exchange electrons, many others are kinetically "insulated" (e.g., biothiols) allowing the biology to set and control their redox states far from equilibrium.
This enzyme, which consists of three repeats (R1, R2 and R3), is a cambialistic carbonic anhydrase that can spontaneously exchange Zn or Cd at its active centre, presumably an adaptative advantage for diatoms that grow fast in the metal-poor environment of the surface ocean.
Membrane lipids, including S1P, do not spontaneously exchange through lipid bilayers since the polar head groups do not readily go through the hydrophobic interior of the plasma membrane.
Because plant Gα subunits spontaneously exchange GDP for GTP, in the absence of the 7TM-RGS, the Gα subunit is GTP bound (i.e. activated) and the Gβγ dimer is freed.
Membrane lipids, including S1P, do not spontaneously exchange through the lipid bilayers of the plasma membrane since the polar head groups do not readily go through the hydrophobic interior.
Internalization of the entire lipoprotein via receptors facilitates but is not exclusively required for the latter process, since the highly amphipathic lipid oxidation products spontaneously exchange between proteins, lipoprotein and cell surfaces [20].
They operate in far-from-equilibrium manner if affinity of the studied system is ≫RT (R is the universal gas constant and T is the absolute temperature), and generate order spontaneously by exchanging energy with their external environment [2, 153].
While antibodies are typically immobilized simply by incubation and non-covalent attachment to hydrophobic surfaces such as polystyrene, the synthetic binder molecules were immobilized using Pluronics molecules that form self-assembled PEG monolayers carrying activated disulfide end groups and react spontaneously in an exchange reaction to form disulfide bonds with unprotected thiols.
Perhaps because depressed patients rarely speak openly or spontaneously about their hurtful exchanges with friends and relatives [ 10], these types of comments, as related to depression, have not yet been systematically exposed.
Most of these actions pop up spontaneously after information is exchanged on Twitter and then co-ordinated through the use of hashtags.
