Explanatory notes
… eggs, potatoes, alginates, agar‑agar, peptones, gelatin, etc., and often contain additional ingredients such as … bring them to the required degree of acidity or alkalinity, etc. There are also other media, e.g., mixtures of sodium … liquid form (broths), pastes or powders but may also be in tablets or granule form, and are sterilised and put up in …