2001c-833 2013f-788 atlases bacteria bacteriology classification cytodiagnosis gram'sstain gram-negativebacteria gram-positivebacteria laboratories laboratorymanuals medicalbacteriology medicalmicrobiology microbiologicallaboratories qw17 qw17c7182013 qw25 qw25m5891994 qy17m347d2001 radioisotopes safetymeasures sterilization