A lactic acid test is a blood test that measures the level of lactic acid made in the body. Most of it is made by muscle tissue and red blood cells.
A biofuel is a fuel that is produced through contemporary biological processes, such as agriculture and anaerobic digestion, rather than a fuel produced by geological processes such as those involved in the formation of fossil fuels, such as coal and petroleum, from prehistoric biological matter.
Types of biofuels. Biofuels are energy carriers that store the energy derived from biomass.* [For a review of terminology relating to biofuels, see FAO (2004a) UBET â Unified Bioenergy Terminology. Rome.] A wide range of biomass sources can be used to produce bioenergy in a variety of forms.