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Scanning electron micrographs showing yeast cells immobilized on delignified brewer’s spent grains, (a) S. cerevisiae, at ×650, (b) S. cerevisiae, at ×1300, (c) S. ludwigii, at ×650, (d) S. ludwigii, at ×1300, (e) S. rouxii, at ×650 and (f) S. rouxii, at ×1300 magnification levels.
