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Concentrations of Na+,K+ and Ca2+ in the growth medium were varied within limits normally found in vivo to determine how cation concentrations affect the sensitivity of ruminal bacteria to the ionophores, monensin (a Na+/H+ and K+/H+ exchanger) and tetronasin (Ca2+/H+). High [Na+] (172 mM cf. 137 mM in control medium) enhanced the efficacy of monensin towards Eubacterium ruminantium 2388, Streptococcus bovis ...
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