Comments:
detailed model of glutamate NMDA receptors, from Destexhe et al. (1998), written by A Destexhe and Z Mainen, 1995. Modified by K Moradi, 2012: release process modeled with an internal alpha function in order to make it compatible with NetCon object, and therefore does not require an external release mechanism. Unit of g changed from pS to uS to make the synaptic weights compatible with internal methods. gmax set to 50, Johnson & Ascher, 1990.