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Related Concept Videos

Microbial Growth Measurement: Direct Methods01:23

Microbial Growth Measurement: Direct Methods

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,...
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Assessing microbial populations is crucial for understanding microbial roles in health, ecology, and industry. Various complementary techniques—both culture-based and molecular—enable detailed analysis of microbial abundance, diversity, and function.Viable Plate CountThe viable plate count is a traditional culture-based method used to estimate the number of living microbes in a sample. After serial dilution, the sample is spread onto nutrient agar plates. Each viable cell forms a visible...
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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...

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New method for counting bacteria associated with coral mucus.

Melissa Garren1, Farooq Azam

  • 1Scripps Institution of Oceanography, Marine Biology Research Division, La Jolla, California 92037, USA. melissa.garren@gmail.com

Applied and Environmental Microbiology
|July 27, 2010
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A new method using trypsinization and DAPI staining allows accurate counting of coral mucus bacteria. This technique reveals bacteria are more abundant but smaller in mucus than seawater, with wastewater impacting cell size.

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Area of Science:

  • Marine microbiology
  • Coral reef ecology
  • Microbial enumeration techniques

Background:

  • Coral mucus layer (CML) presents challenges for bacterial quantification due to viscosity and autofluorescence.
  • Accurate bacterial counts are crucial for understanding coral health and microbial ecology.

Purpose of the Study:

  • To develop a reliable and cost-effective method for quantifying bacteria in coral mucus.
  • To compare bacterial abundance and cell size in coral mucus versus surrounding seawater.
  • To assess the impact of wastewater intrusion on coral-associated microbial communities.

Main Methods:

  • A novel method involving trypsinization to disperse cells before 4',6-diamidino-2-phenylindole (DAPI) staining.
  • Quantification using epifluorescence microscopy.
  • Sampling of seawater and mucus from Porites lobata at wastewater-influenced and uninfluenced reef sites in Hawaii.

Main Results:

  • Bacteria are significantly more abundant in coral mucus than in surrounding seawater.
  • Mucus-associated bacteria are smaller than seawater-associated bacteria.
  • Wastewater intrusion altered bacterial cell size in both mucus and seawater environments.
  • Zooxanthellae abundance in mucus was quantified, and frequency of dividing cells was higher in seawater.

Conclusions:

  • The developed trypsinization and DAPI staining method offers a standardized protocol for bacterial enumeration in CML.
  • This method will enable more consistent and comparable studies in coral microbial ecology.
  • Findings highlight distinct bacterial communities within coral mucus compared to the surrounding water column.