Morphology of bacterial granules developed in an upflow anaerobic acid reactor

Environmental Technology
Debraj Bhattacharyya, Kripa S Singh

Abstract

Macro- and micro-structures of granules, developed in an upflow anaerobic acid reactor, were examined by light and electron microscopy. Every granule was found to be white, soft and non-spherical and had an open cavity at the centre. Scanning electron microscopy showed that the granules were composed of rod-shaped bacteria, of different thicknesses and lengths, arranged in three distinct layers within the granules. Transmission electron microscopic analysis of ultra-thin sections of granules, stained with Ruthenium Red, revealed the presence of extra-cellular polymeric materials around the cells. Gram staining tests confirmed the presence of both Gram-positive and Gram-negative bacteria in the granules. The intertwined nature of the bacterial arrangement in the granules and the extracellular polymeric substance that encapsulated the cell colonies contributed to the structural stability of the granules.

References

Jun 1, 1990·Applied and Environmental Microbiology·F A MacLeodJ W Costerton
Jan 1, 1971·Environmental Letters·F G Pohland, S Ghosh
Dec 5, 2000·Trends in Biotechnology·M G Bramucci, V Nagarajan
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May 3, 2005·Behavior Genetics·Jennifer M Gleason
Apr 17, 2008·Water Science and Technology : a Journal of the International Association on Water Pollution Research·D Bhattacharyya, K S Singh

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Citations

Jun 23, 2012·Environmental Technology·Aicha KhenifiZoubir Derriche
Jun 4, 2015·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Yudy Andrea Londoño, Gustavo Antonio Peñuela

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Methods Mentioned

BETA
scanning electron microscopy

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