A biofuel is a hydrocarbon that is made by a living organism that we humans can use to power something. This definition of a biofuel is rather formal.Any hydrocarbon fuel that is produced from organic matter in a short period of time is considered a biofuel. This shows with fossil fuels, which take millions of years to form and with other types of fuel which are not based on hydrocarbons.
Biofuels are tricky to understand is that they need not be made by a living organism, though they can be. Biofuels can also be made through chemical reactions, carried out in a laboratory or industrial setting, that use organic matter to make fuel. The only real requirements for a biofuel are that the starting material must be CO2 that was fixed by a living organism and the final fuel product must be produced quickly and not over millions of years.
Review article comes in the form of systematic reviews and literature reviews and are a form of secondary literature. Systematic reviews determine an objective list of criteria, and find all previously published original research papers that meet the criteria. They then compare the results presented in these papers. Literature reviews, by contrast, provide a summary of what the authors believe are the best and most relevant prior publications.
Last date updated on September, 2014