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Fig. 4 | Parasites & Vectors

Fig. 4

From: Isolation and characterization of native Bacillus thuringiensis strains from Saudi Arabia with enhanced larvicidal toxicity against the mosquito vector Anopheles gambiae (s.l.)

Fig. 4

Comparisons among the native Bt63 and the reference strain Bt-H14 through biochemical profiling, scanning electron micrography and phase-contrast microscopy. In a, biochemical profiling with the API 50CH system shows that the Bt63 isolate produces acid from sucrose (indicated by arrow), whereas in b Bti-H14 is negative (arrow); all other 49 biochemical reactions were similar. In c and d, scanning electron micrograph (×10,000) of Bt63 reveals its larger Cry crystals (Cr) and smaller spores (Sp) than those Bti-H14. In e and f, the phase-contrast micrographs of sucrose gradient-separated Cry Crystals (Cr) from Bt63 appear, comparatively, larger than those of Bti-H14. Scale-bars: c, d, 1 μm; e, f, 10 μm

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