Characterization of novel psychrophilic clostridia from an Antarctic microbial mat: description of Clostridium frigoris sp. nov., Clostridium lacusfryxellense sp. nov., Clostridium bowmanii sp. nov. and Clostridium psychrophilum sp. nov. and reclassification of Clostridium laramiense as Clostridium estertheticum subsp. laramiense subsp. nov., by S. Spring, B. Merkhoffer, N. Weiss, R. M. Kroppenstedt, H. Hippe & E. Stackebrandt
International Journal of Systematic and Evolutionary Microbiology vol. 53, part 4, pp. 1019 - 1029
Supplementary Figure. Temperature profiles of the strains studied displayed as Ratkowsky-type plots. Growth-rate constants were calculated in exponentially growing cultures by linear regression of ln(OD600) as a function of time. The large graph shows the relationship between the square root of the growth-rate constant measured at suboptimal temperatures and at the absolute temperature. Dashed lines result from linear regression and can be used to estimate growth rates at intermediate temperatures from the minimum to just below the optimum. Ratkowsky plots of data obtained from the complete temperature range studied are shown as an inset on the left. Graphically determined temperature optima are marked by arrows. [PDF] (15 KB)
