MAPK/ERK pathway. The MAPK/ERK pathway (also known as the Ras-Raf-MEK-ERK pathway) is a chain of proteins in the cell that communicates a signal from a receptor on the surface of the cell to the DNA in the nucleus of the cell.
Acclimatization or acclimatisation (also called acclimation or acclimatation) is the process in which an individual organism adjusts to a change in its environment (such as a change in altitude, temperature, humidity, photoperiod, or pH), allowing it to maintain performance across a range of environmental conditions.
Chambers 20th Century Dictionary (0.00 / 0 votes) Rate this definition: Collimation. kol-li-mÄâ²shun, n. the adjustment of the line of sight of a telescope.âv.t. Colâ²limÄte.ân. CollimÄâ²tor, a subsidiary telescope used to detect errors in collimation, when adjusting for transit observations. [L.