Sponsored photos by

WADA World Anti Doping Agency - foundation initiated by the International Olympic Committee to promote, coordinate, and monitor the fight against drugs in sports, acronym text concept stamp
N-type semiconductors are doped with phosphorus (P) for extra electrons, while p-type are doped with boron (B) for holes. N-type semiconductors have electrons, while p-type have holes from doping.
Semiconductors. P-type has positive charge carriers (holes), N-type has negative charge carriers (electrons). Impurity semiconductors.
Basic - Health and Fitness icons
Stop drug addiction concept. Young human hand crushing white pills with fist on grungy concrete floor. International Day against Drug Abuse. Close up.
Doctor, patient and urine test cup. Physician giving pee container to a woman in clinic or hospital emergency room. Urinary sample for medical exam in hospital. Checkup for infection or salmonella.

Free stock photosdoping (139)