Effect of temperature and pH on the toxicity of aluminium towards two new, soil born species of Arthrobacter sp.
Two coryneform bacteria Arthrobacter sp. PI/1-95 (Arth1) and Arthrobacter sp. PI/3-95 (Arth3) were isolated from forest soil characterized and investigated with respect to their reaction towards aluminium (Al). Sigmoid functions were used to describe dose-response relationships between Al concentration and microbial growth and to calculate EC-values. EC(100) -- indicating a complete inhibition of microbial growth -- varied between 185 microM Al for Arth1 and 11 mM Al for Arth3. A pure pH effect seems probable in connection with the sensitive Arth1 but not with the tolerant species Arth3. Temperature was shown to distinctly increase the toxic effects of Al towards Arth3 whereas only a moderate modification in Al-toxicity was observed with Arth1.
Illmer
Paul
P
Institute of Microbiology, University of Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria. Paul.Illmer@uibk.ac.at
Mutschlechner
Wolfgang
W
D000535:Aluminum / Q000494:pharmacology*; D001173:Arthrobacter / Q000187:drug effects* / Q000254:growth & development; D006863:Hydrogen-Ion Concentration; D008826:Microbial Sensitivity Tests; D012988:Soil Microbiology; D013696:Temperature
D000535:Aluminum