Abstract
Filosa1, Cordero2 and Rousell3 found that homogenates of the normal fat-body of the American cockroach, Periplaneta americana, can synthesize ascorbic acid with D-mannose as the substrate. Similar results were obtained by Lisa4 with the fat body of the normal cockroach, Leucophaea maderae. Since the fat-body of these insects contains intra-cellular symbionts, it was suspected that the synthesis of this vitamin may be due to the presence of these micro-organisms. Hence, the present experiments were performed with the aposymbiotic fat-body and the symbionts of Leucophaea maderae to determine whether or not this is the case.
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