Development of an interspecies interaction model: An experiment on Clostridium cadaveris and Clostridium sporogenes under anaerobic condition

Journal of Environmental Management
Taewoan KooSeokhwan Hwang

Abstract

The specific primer and probe sets for quantifying Clostridium cadaveris and Clostridium sporogenes using a quantitative real-time PCR were designed. Each primer and probe set detected only the target species very specifically. The two species were cultivated in pure and mixed culture in batch mode with glucose as the only carbon source. The designed QPCR sets were used successfully to estimate the biokinetic parameters of each species in pure culture: i.e., maximum specific growth rate μmax, half saturation concentration Ks, growth yield Y, and decay coefficient Kd. of C. cadaveris and C. sporogenes were 0.311 ± 0.020 and 0.360 ± 0.019 h-1, 4.241 ± 1.653 and 5.171 ± 1.097 g/L, 0.301 ± 0.065 and 0.199 ± 0.037 1011 copies/g, 0.005 ± 0.043 and 0.009 ± 0.025 h-1, respectively. The effect of interspecific interaction of on substrate consumption rate and microbial growth was evaluated using mixed culture; curve fitting and comparison of coefficients detected increase in substrate consumption rate but decrease in microbial growth rate; these results imply interspecific interaction effect. A new model was of the interspecific interaction was developed, with focus on accuracy, realism, simplicity and biological significance. This inter...Continue Reading

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