Emulsion Definition. An emulsion is a colloid of two or more immiscible liquids where one liquid contains a dispersion of the other liquids. In other words, an emulsion is a special type of mixture made by combining two liquids that normally don't mix. The word emulsion comes from the Latin word meaning to milk (milk is one example of an emulsion of fat and water). The process of turning a liquid mixture into an emulsion is called emulsification.
During the drug testing process, the medicine in Saxenda Â® caused rats and mice to develop tumors of the thyroid gland. Some of these tumors were cancers. It is not known if Saxenda Â® will cause thyroid tumors or a type of thyroid cancer called medullary thyroid cancer in people.
Our series, Animals in Research, profiles the top organisms used for science experimentation. In this instalment, we look at the original lab rats: Rattus norvegicus. Rats have a long history in medical research: they were the first mammalian species specifically domesticated to be used in the laboratory. Records dating back to the 1850s show these animals were derived from those bred by rat fanciers who collected them for their unique coat colours and behavioural characteristics.