Degradation dynamics of Cry1Ab insecticidal protein within transgenic Bacillus thuringiensis corn plant debris under different conditions Expression and degradation of Cry1Ab protein in Bt hybrid rice and its impacts on ground-dwelling Entomobrya griseoolivata occurrence in postharvest seasons Temporal expression patterns of Cry1Ab insecticidal protein in Bt rice plants and its degradation in paddy soils