One lab technician hands over test tubes to his colleague for researches
Chemists analyzing test tubes with liquid in lab
A serious lab technician studies test tubes with assays
Lab technician controls chemical substances in test tubes
A close up of the hands of the laboratory assistant who carefully rewrites the data about test tubes into his documents
Hand of a lab technician, pharmacist or doctor holding a test tube adding a chemical solution from a pipette during a test or experiment watched by colleagues or students
Hand of a lab technician, pharmacist or doctor holding a test tube adding a chemical solution from a pipette during a test or experiment watched by colleagues or students
Close-up of the face of the lab worker who is studying the test tube with the assays
Black female research scientist giving his colleague test-tubes with fertilizer and then making experiments with different samples in chemistry lab.
Young scientist experimenting with medicines in microbiology laboratory close up. Serious lab technician looking at test tube