Table 2 - The potential use of anoxygenic phototrophic bacteria for treating latex rubber sheet wastewater

Table 2. Morphological and physiological characteristics of isolate DK6 grown with anaerobic-light conditions at 30ºC and modifications to the basal minimal medium of Ormerod et al. (1961).

Characteristic	DK6	*Rhodopseudomonas blastica^a*
Colour of culture (anaerobic-light)	red	red
Colour of culture (aerobic-dark)	white	white to pink
Cell shape	short rod	rod
Gram staining	negative	negative
Motility	non motile	non motile
Biotin	require	require
Nicotinic acid	require	require
p-aminobenzoic acid	require	require
Thiamine hydrochloride	require	require
pH (5-9)	growth	o
Optimum pH	6.5-7.5	6.5-7.5
Temperature (25-45ºC)	growth	o
Optimum temperature	30ºC	30-35ºC
Acetate	+	+
Arginine	-	o
Benzoate	-	-
Butyrate	+	+
Caproate	+	o
Citrate	+	+
Ethanol^b	+	-
Formate	-	-
Fructose	+	+
Fumarate	+	+
Glucose	+	+
Gluconate	-	o
Glycerol	+	+
Glycolate	-	-
Gelatin	+	+
Lactate	+	+
Malonate	+	o
Methanol	-	-
Mannitol	+	+
Nitrate	+	o
Propionate	+	+
Pyruvate	+	+
Succinate	+	+
Sulfide	-	-
Thiosulfate^b	+	-
Sorbitol	+	+
Tartrate	-	-

+ = utilized
- = not utilized
o=not determined
a=Code from Imhoff and Truper, 1989
b= substrate in respect of which the utilization by DK6 and Rhodopseudomonas blastica differs