gram positive and gram negative bacteria. coccus, bacillus, curved bacteria in petri dish.

aeruginosa aureus bacilli bacillus bacteria bacterial bacterium biology botulinum cell cholerae clostridium coli dish epidemiology escherichia flat gonorrhoeae gram helicobacter infection isolate luteus micro microbe microbiology microorganism microscopic moniliformis negative neisseria organism palladium pathogen peptidoglycan petri pink positive pseudomonas purple pylory pyogenes research science set stain streptobacillus test treponema vector vibrio violet