CaMKII also improves AMPA ionic conductance through phosphorylation. Low-voltage activated calcium ion conductance enhances even larger EPSPs. A number of models of stomatal conductance exist. The ballistic thermal conductance of graphene is isotropic. EPSPs are amplified by persistent sodium ion conductance in external tufted cells. Thermal resistance is the inverse of thermal conductance. CF is caused by a mutation in the gene cystic fibrosis transmembrane conductance regulator ("CFTR"). Thermal resistance is the reciprocal of thermal conductance. The size of each weight is the relative conductance of each ion. This is due to a larger-than-resting potassium conductance across the cell membrane. Arousal can be measured by skin conductance, brain waves or sweating. The Cheeger bound guarantees that spectral bisection provides partitions with nearly optimal conductance. When plant aquaporins are silenced, the hydraulic conductance and photosynthesis of the leaf decrease. The sensitivity is partly limited by the thermal conductance of the pixel. It is the reciprocal of thermal conductance.