umbrella species
biol. A species chosen to be the subject of particular conservation efforts because the protection of that species will also have the effect of giving protection to co-occurring species in […]
uncertainty principle
phys. The principle formulated by Heisenberg, stating that Planck’s constant, h, sets a limit on the accuracy of measurement at the atomic level. Accordingly, it is not possible to measure […]
unconditioned stimulus
neurosci. A stimulus that evokes an unconditioned response. རྐྱེན་འདྲིས་མེད་པའི་ཡ་ལན་ཞིག་སློང་བར་བྱེད་པའི་སྐུལ་རྐྱེན་ཞིག་ལ་ཟེར།