<prompt> Hot air oven is used for sterilization of all except -Glass waresDusting PowderL.J.mediaLiquid paraffin  <response>: Hot air oven - most widely used method of sterilization by dry heat Temperature for sterilization - 160degC for 2 hours Control used - spores of Bacillus subtilis Materials sterilized - 1 Glassware like glass syringes, petri dishes, flasks, pipettes test tubes 2 Surgical instruments like scalpels, forceps etc. 3 Chemicals such as liquid paraffin, fats, glycerol etc. Culture Media are sterlized by Autoclaving. 