Table 2. Biochemical activities of amylase-producing bacterial isolates and their starch hydrolysis rates.

Isolate/Testsa	Gram reaction	Motility	Catalase	Egg yolk lecithinase	Nitrate reduction	Vogas proskauer	Citrate utilization	Gelatin hydrolysis	Starch hydrolysis	Indole production
Bacillus megaterium	+	+	+	–	–	–	+	+	+	–
Bacillus subtilis	+	+	+	–	+	+	+	+	+	–
Bacillus cereus	+	+	+	+	+	+	+	–	+	–
Bacillus thuringiesis	+	+	+	+	–	+	+	–	+	–
Bacillus lentus	+	+	+	–	–	–	–	+	+	–
Bacillus mycoides	+	–	+	+	–	+	+	–	+	+
Bacillus alvei	+	+	+	–	–	+	–	+	+	+
Bacillus polymyxa	+	+	+	–	+	+	–	+	+	–
Bacillus circulans	+	+	+	–	+	–	–	+	+	–
Micrococcus roseus	+	+	+	–	+	–	+	–	+	–

Notes.

^aMorphological and biochemical tests used for identifying isolated bacteria.

⁺Positive.

^–Negative.

^bStarch hydrolysis rate.