Physicochemical Phenomena: The physical phenomena describing the structure and properties of atoms and molecules, and their reaction and interaction processes.Raynaud Disease: An idiopathic vascular disorder characterized by bilateral Raynaud phenomenon, the abrupt onset of digital paleness or CYANOSIS in response to cold exposure or stress.No-Reflow Phenomenon: Markedly reduced or absent REPERFUSION in an infarct zone following the removal of an obstruction or constriction of an artery.