Several types of extremely thermophilic archaebacteria have recently been isolated from solfataric water holes, hot springs and hot sea floors. It has been shown that some of them can live using sulphur respiration of reduced carbon substrates as a source of energy, a type of metabolism previously described for the eubacterium Desulfuromonas. We report here that several extremely thermophilic archaebacteria can live with carbon dioxide as their sole carbon source, obtaining energy from the oxidation of hydrogen by sulphur, producing hydrogen sulphide. They are thus capable of a new type of anaerobic, purely chemolithoautotrophic metabolism, a possible primaeval mode of life.

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The uptake and translocation of [36C1] Dursban and [14C] Dursban by leaves and corn plants were studied. Both root and leaf absorption were insignificant. Only a small percentage of the radioactivity (1 to 2%) was translocated into the plant. These were largely breakdown products such as the 3,5,6-trichloro-2-pyridinol.In

Paper partition and thin-layer chromatographic products. These procedures have been used to procedures have been developed for the isolation identify the products formed by biological and and identification of Dursban and its breakdown chemical breakdown of the Dursban.