  In the fractional quantum Hall effect regime we measure diagonal
($\rho_{xx}$) and Hall ($\rho_{xy}$) magnetoresistivity tensor components of
two-dimensional electron system (2DES) in gated GaAs/Al$_{x}$Ga$_{1-x}$As
heterojunctions, together with capacitance between 2DES and the gate. We
observe 1/3- and 2/3-fractional quantum Hall effect at rather low magnetic
fields where corresponding fractional minima in the thermodynamical density of
states have already disappeared manifesting complete suppression of the
quasiparticle energy gaps.
