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Agar

(Science: cell culture, chemical, microbiology) this gelatinous material, an extract from red algae (mainly Gelidium and Gracilaria species), is most frequently used as a culture medium, especially for bacteria. It is also used as a thickener in foods, but humans cannot digest it. Any culture medium that uses agar as the gelling agent.A colloidal extract of algae; used especially in culture media and as a gelling agent in foods.Agar is a biological substance obtained from marine algae and has many properties which make it a valuable tool to scientists in scientific experiments.