Ultramicrotomy Sections: 50-70 nm thick 0.1-0.5 mm square Resin good morphology Cryo good immuno-labelling Knives Glass Diamond

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Ultramicrotomy Sections: nm thick mm square Resin good morphology Cryo good immuno-labelling Knives Glass Diamond 3mm diamond

Ultramicrotomy Sections: nm thick mm square Resin good morphology Cryo good immuno-labelling Knives Glass Diamond specimen knife speed/thickness controller

Processing for resin sectioning Protocol: 1.Fix (4% paraformaldehyde, 2.5% glutaradehyde)4hrs-o/n 2.Wash and quench (50mM glycine)5 min 3.1% OsO 4 1.5hrs 4.5% alcoholic uranyl acetate1.5hrs 5.Dehydrate (50%, 70%, 90%, 100% ethanol, 100% acetone) 1.5hrs 6.Infiltrate (araldite resin; 30:70, 70:30, 100%)4 hrs 7.Polymerise 60ºCo/n Sample: eg. cells in 1 x 6cm dish. Final pellet ≤1mm 3

Processing for resin sectioning 1. Trim block (≤0.3mm 2 face) 3. Collect sections on EM grid 2. Sectioning 50-70nm (silver/gold colour)

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