Coitus interruptus, also known as the withdrawal. method, is the oldest form of male contraceptive. method to be practiced.[1] It involves the male partner. pulling out the penis before ejaculation.[1] Even though. it is the oldest method of male contraception to be. practiced, research has given it very little attention.
Updated September 18, 2016. Fermentation is an energy-yielding anaerobic metabolic process in which organisms convert nutrients (typically carbohydrates) to alcohols and acids (lactic acid and acetic acid). Fermentation is perhaps the most ancient biotechnological discovery.
You know that tempeh is a fermented food, but what is fermentation exactly? The scientific meaning of fermentation is the energy-yielding anaerobic metabolism of a nutrients, such as sugars, without oxidation. Fermentation converts these nutrients mainly into lactic acid, acetic acid, and ethanol.These are fermentation end product of some microorganisms: In a broader meaning, fermentation refers to the growth of microorganisms on food.Here no distinction is made between aerobic (oxygen is used) and anaerobic (no oxygen is used) metabolism. We will here use this broader meaning of fermentation.n a broader meaning, fermentation refers to the growth of microorganisms on food. Here no distinction is made between aerobic (oxygen is used) and anaerobic (no oxygen is used) metabolism. We will here use this broader meaning of fermentation.