people hand holding a test tube vial sets for analysis in the gas liquid chromatograph. laboratory assistant inserting laboratory

analysis analyzing assistant auto biology biotechnology bottle centrifuge chemical chemistry chromatograph chromatography clinical doctor electronic equipment experiment face female flask glass glove hand health holding holds hospital inserting instrument laboratory liquid look machine male medical medicine microscope people person profession professional putting research sample sampler samples science scientific scientist sets study technician technology test them tube vial white with work worker