LYCOS RETRIEVER 
Digestion: Process
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Digestion is the process whereby a biological entity processes a substance, in order to chemically convert the substance into nutrients. Digestion occurs at the multicellular, cellular, and sub-cellular levels, usually in animals.
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Digestion occurs at the multicellular, cellular, and sub-cellular levels in animals and some plants. This process takes place in the digestive system, gastrointestinal tract, or alimentary canal. The digestive system as a whole is a one-way tube with accessory organs like the liver, gallbladder, and pancreas that assist in the chemical processes involved in digestion.
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Digestion in biochemistry refers to the hydrolysis of any large nutrient molecules. It is the process by which large, bulky molecules of little use by themselves are broken down into smaller molecules or individual ions that are immensely useful. It is different from metabolism (even though the two are sometimes used interchangeably) because digestion merely refers to the process of breaking down, it does not deal with absorption and utilization of those broken down nutrients (which is what metabolism is for).
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Almost any organic material can be processed with anaerobic digestion. This includes biodegradable waste materials such as waste paper, grass clippings, leftover food, sewage and animal waste. Anaerobic digesters can ... be fed with specially grown energy crops or silage for dedicated biogas production. After sorting or screening to remove physical contaminants, such as metals and plastics, from the feedstock the material is often shredded, minced, or hydrocrushed[15] to increase the surface area available to microbes in the digesters and hence increase the speed of digestion. The material is then fed into an airtight digester where the anaerobic treatment takes place.
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The tract running from the esophagus to the large intestine is called the alimentary canal, and it is where most digestion occurs. As food is pushed through the system, it encounters numerous specialized processes that act on it in different ways, extracting nutrients and rejecting waste.
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Anaerobic digestion is a simple process that can greatly reduce the amount of organic matter which might otherwise end up in landfills or waste incinerators. In developing countries simple home and farm-based anaerobic digestion systems offer the potential for cheap, low cost energy from biogas.[11][12][13] An anaerobic digester configured to produce energy in this way is ... be termed a biogas plant.
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