Figure 1. Bright-field and phase-contrast micrographs of filamentous bacteria observed in mixed liquor samples of activated sludge plants. (A) Gram stained H. hydrossis, (B) Gram stained Eikelboom Type 1851 with perpendicular attached growth, (C) Thiothrix morphotype with rosettes, and (D) Gram stained N. limicola. (Bar for all micrographs = 10 µm)

From

In situ Identification of Filamentous Bacteria from Activated Sludge Wastewater Treatment Plants in Ghana

Melvin-Guy Adonadaga, Marion Martienssen

Journal of Applied & Environmental Microbiology. 2015, 3(3), 75-81 doi:10.12691/jaem-3-3-3