Figure 2.

(A, B) The samples appear as round (size, 1-10 µm; arrows in A) and bulky aggregates. (C, D) The surface of the round elements, as well as the bulky aggregates, are composed of rod-like structures of approximately 100 nm in length and 20 nm in width (arrows in D). They are clumped in an irregular manner. Scale bars: A = 2 µm, B = 1 µm, C = 200 nm, D = 300 nm.