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Smelly socks are socks that have acquired an unpleasant odour due to prolonged use. Their odour, which is complex and remains the object of study, is a mixture of ammonia, fatty acids (in particular, isovaleric acid),〔(【引用サイトリンク】title=In Short: Taste & Smell )〕 and lactic acid. While odorous socks are repellent to most humans, they are a strong attractant for some animals, including dogs and mosquitos. They have proven useful in controlling the behavior of these animals. Although the odour of smelly socks is often associated with feet, it arises independently of contact with human feet in various foodstuffs such as dairy products, cheeses, sausages and fish sauce, and is naturally present in several plants. The smell has also been noted in building and automotive air treatment systems, where it is described as "jock socks odor" or "dirty socks syndrome". Several technologies have been developed to incorporate materials into sock textiles which reduce or eliminate the bad smell. ==Air contamination== Smelly socks have an unpleasant odour. This commonly results from bacterial action upon sweat which accumulates due to confining footwear. The odor has also presented itself as a problem among users of prosthetics.〔(【引用サイトリンク】url=http://www.lib.kobe-u.ac.jp/repository/thesis/d2/D2002401.pdf )〕 Smelly socks may be a source of air contamination in aircraft and dwellings. Their distinctive unpleasant odour is commonly used as a reference. A 1996 ''Popular Mechanics'' article describes "jock socks odor" complaints as one of the magazine's most frequent queries with regard to automotive air conditioning systems, attributing the odor to fungal growth within the auto. The term "Dirty Sock Syndrome" is used to describe unpleasant odors that arise in building heating and cooling systems.〔(【引用サイトリンク】url=http://www.cdc.gov/niosh/hhe/reports/pdfs/1998-0300-2723.pdf )〕 High-efficiency heat pumps in the southeastern US have been noted as frequent offenders. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「smelly socks」の詳細全文を読む スポンサード リンク
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