Fig. 2: Transmission electron microscopic observation of ZVS produced by E. flavus 21–3.

a TEM image of purified ZVS produced by E. flavus 21–3. b Energy dispersive spectrum analysis of the separated ZVS shown in panel A. TEM images of E. flavus 21–3 cells mixed with ZVS when cultured for 12 h (c) or 36 h (d) in medium supplemented with 40 mM thiosulfate.