gram stain test. glass petri dish with culture gram-negative and gram-negative bacteria

gram stain test glass petri dish culture gramnegative bacteria escherichia coli crystal violet closeup grampositive clostridium bacteriology cytoplasmic antibiotic cell membrane science microbiology disease infection medical laboratory bacilli medicine bacterial biology health bacterium microscope lab positive microscopic human scientific microbe research smear organism blue microscopy infectious specimen analysis inflammatory sputum micro pathogen rod contaminants bacillus ecoli vector test gram-negative used stain close-up gram-positive perfringens