Root fOLMS cecccccescceecccesceeesecccecnececececcecssseecesasesecenaeeccsteceseeeseecsnnneesnenneeenscenensseemseeneseonsecensesuencenneseans 24 Alig DOAUCS cecoccmcecccocacsacscccesecesssanessessseraesesnesesesenesessesecnsncosecconeatecsssoneeeaeensesseestsetsnsesseeeneee 24 Coriaria NOAULES ceccccccocccccccccesccsescecescecseseseecesesesnesescernecesecaneneuseeceeseaeeceetsesseteecesetsnscetensecsenene QO -Nodules on the Elaecagnaceae......ccscccsessccccecsessassccnssscesseceeesssnesecsssaesenesensssnecosssnecaneenasectneee ZO Ceanothus todtles cocccccccccccoscscco-ccsucsuvsvssossnessceneeneeneronssessesesecseceenetstencenseenesateeneecessesseseseesenee OD Meyrica nodules -.n..cessecescecssccesceceesceeeeeseneeseeceeteneatectecesenenssssenecneaseee menmeccenanaesnmecnsenenaeateaeass Podocar pus nOdules -...-.-sceccccccecececceccceceeeneeccereeeeneeseneecenssensecnmmemnessteneeesnsnesnenemamemenenaesenseatens Nodules on the Cycadaceae -...n..ssssssssssssscsnsssoseecosssesescessenesseneeseessenesesnenconesensessnsesscatecsatees COSUAVING TOAUICS ceccecccmcoccccsecccsscoescssesessssesceseeeesesoesteseeenecesesecotssssnenetestneneacoesesersesessesnesenenseee

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Various bacteria, actinomycetes, and filamentous fungi decomposed methionine, but only certain aerobic bacteria isolated from soil decomposed it in the absence of other organic substrates. These bacteria could grow on methionine as the only organic substrate and source of nitrogen and sulfur. Methionine was first deaminated and then demethiolated with production of methanethiol, part of which was oxidized to dimethyl disulfide. The amount of methanethiol that was oxidized varied with different cultures. A bacterial culture initially unable to grow on methionine developed capacity to do this in a medium which contained methionine and other growth substrates. The two sulfur products, methanethiol and dimethyl disulfide, are volatile and escaped from the media, resulting in a decrease in the sulfur content proportional to the amount of methionine decomposed.