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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Wallemiomycetes ： ウィキペディア英語版 Wallemiomycetes The Wallemiomycetes are a class of fungi in the division Basidiomycota. It consists of the single order Wallemiales, containing the single family Wallemiaceae, which in turn contains the single genus ''Wallemia''. The phylogenetic origin of the lineage was placed to various parts of Basidiomycota, but according to the analysis of a larger dataset it is a sister group of Agaricomycotina.〔〔 The genus contains species of xerophilic molds that are found worldwide. The three described species (''W. sebi'', ''W. muriae'', and ''W. ichthyophaga'') are distinguished by size range of conidia (asexual spores), the degree of xerotolerance and ribosomal DNA sequences.〔 They are typically isolated from low-moisture foods (such as cakes, bread, sugar, peanuts, dried fish), indoor air dust, salterns and soil.〔 ''W. sebi'' is thought to be one of the causes of the hypersensitivity pneumonitis known as the farmer's lung disease, but since the other two species were recognised and separated from ''W. sebi'' only recently, their role in the disease cannot be excluded.〔 Tolerance to low water activity is generally much more frequent among ascomycetous than basidomycetous fungi, and xerotolerant fungi are also able to grow in regular growth media with normal water activity (unlike, for example, halophilic Archaea). However, species from the genus ''Wallemia ''are an exception to both of these rules: all three species can tolerate high concentrations of sugars and salts (''W. ichthyophaga'' grows even in media saturated with sodium chloride), while ''W. muriae'' and ''W. ichthyophaga'' cannot be cultivated unless the water activity of the medium is lowered.〔 Cell wall and morphological changes of ''Wallemia'' species are thought to play a major role in adaptation to low water activity. The whole genome sequences of ''W. sebi'' and ''W. ichthyophaga'' are available. ==References== 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「Wallemiomycetes」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.