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microbiology pharmaceutical waste pathological waste infectious waste ladfill pasma torch waste disposal manual types of waste waste disposal segregation of waste disposal of biomedical waste types of biomedical waste definition of biomedical waste biomedical waste gmt in laboratory bsl4 bsl3 bsl2 bsl 1 safety cabinet safety measures and infection control infection control microbial stain negative stain india ink preparation acid fast stain ziehl-neelsen stain bacterial stain gram stain simple stain bacterial culture media culture media classification and types macconkey agar indicator culture media differential culture media selective culture medium blood agar nutrient agar culture media transportation of waste radioactive waste chemical waste genotoxic waste eg. certain cytotoxic or radioact sharps safety measures