osmic acid fixative

os·mic ac·id fix·a·tive

a fixative used alone in buffer or as a postfixative after a glutaraldehyde fixative in electron microscopy; an excellent membrane fixative but a poor preservative of chromatin.
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The peptic ulcer tissue was fixed in 4% paraformaldehyde and 1% osmic acid fixatives for electron microscopy.
Association between helicobacter pylori related peptic ulcer tissue and somatic mitochondrial DNA mutations

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