Use of membrane filters for the enumeration of autotrophic thiobacilli
1Laboratory of Soil Microbiology, O.R.S.T.O.M., Dakar, Senegal.
Microbial Ecology
|November 16, 2013
Abstract:
A new membrane filter technique for field use was developed for the enumeration of either aerobic or anaerobic, autotrophic, sulfur-oxidizing bacteria in waters and soils. Immediately after collection, samples were filtered through sulfur-coated filters and incubated in selective media. Acidification or gas evolution was used as a growth indicator of aerobic and anaerobic thiobacilli, respectively, and related to the initial number of cells deposited on the filter.
Related Concept Videos
Microbial Growth Measurement: Indirect Methods
2.3K
Estimating microbial growth is essential for understanding population dynamics and environmental adaptations. Indirect methods provide valuable insights by measuring parameters such as turbidity, metabolic activity, and biomass, enabling efficient and reproducible assessments.During exponential growth, microbial cells scatter light proportionally to their biomass, a principle used in turbidity measurements. About one million cells per milliliter produce detectable scattering, which a...
2.3K
Microbial Growth Measurement: Direct Methods
2.9K
Direct methods for measuring microbial populations in a culture are essential tools in microbiology, providing quantitative data for various applications. Among these, microscopic counts, plate counts, and serial dilution are widely used techniques, each with unique principles and applications.Microscopic CountsMicroscopic counting involves the use of a Petroff-Hausser chamber, a specialized microscope slide with a grid and defined depth. By observing a liquid culture under a microscope,...
2.9K


