In this Article. In this Article. A solitary pulmonary nodule (SPN) is a single abnormality in the lung that is smaller than 3 cm in diameter. Generally, a pulmonary nodule must grow to at least 1 cm in diameter before it can be seen on a chest X-ray.
Osmosis is the scientific process of transferring fluid between molecules. When molecules move in and out of a cell to achieve the same concentration of something, like salt, on both sides, then osmosis is happening.
Chemiosmosis. Definition. noun. The subsequent movement of ions from an area of higher concentration to an area of lower concentration through t ransport proteins on the selectively-permeable membrane as a result of a proton gradient that forms across the membrane that is not readily permeable to ions.