Fig. 1From: Enhancing the insecticidal activity of new Bacillus thuringiensis X023 by copper ionsMicroscopic observation of the BtX023 strain. a single cell morphology observed by electron microscopy (24 h); b electron microscopic observation of crystal protein and spores (36 h), black arrow indicates the rhomboid and spherical companion crystal, white arrow indicates the spores; c, d, Cell morphology after fermentation for 30 h and 48 hBack to article page