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- ArticleHinke JA, Menard MR.Respir Physiol. 1978 Apr;33(1):31-40.Intracellular pH in single muscle fibres from Balanus nubilus was determined, both by the weak acid distribution method (using 5,5-dimethyl-2,4-oxazolidine dione) and by means of a glass pH microelectrode, following prolonged equilibrations in normal, acid or alkaline Ringer solutions. In the DMO method [3H]inulin was combined with [14C]DMO so that an extracellular space could be calculated for each 'DMO space' on each fibre. Less than ideal uptake curves were obtained both for [14C]DMO and [3H]inulin, yet the calculated pHi compared favourably with the microelectrode pHi, especially when the DMO-pHi was calculated from [14C]DMO and [3H]inulin values obtained by extrapolating the 'plateaus' of the uptake curves to time zero. The Waddell and Butler equation was examined to determine why acceptable pHi values should be forthcoming from less than ideal uptake data.