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Methods to Assess Microbial Populations

Methods to Assess Microbial Populations

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...

Microbial Growth Measurement: Indirect Methods

Microbial Growth Measurement: Indirect Methods

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...

Microbial Growth Measurement: Direct Methods

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,...

Microbial Morphologies

Microbial Morphologies

Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...

Cell Size

Cell Size

Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding the cells limits the...

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In Situ Microscopy for Real-time Determination of Single-cell Morphology in Bioprocesses

In Situ Microscopy for Real-time Determination of Single-cell Morphology in Bioprocesses

Published on: December 5, 2019

Sizing up microbes.

V K Viswanathan¹

¹Veterinary Science and Microbiology, University of Arizona, Tucson, AZ, USA. vkv@email.arizona.edu

|November 3, 2012

Summary

Microorganism size is governed by physics. Larger microbes, nearing one millimeter, possess unique adaptations to overcome physical constraints, influencing their pathogenic functions and interactions.

Area of Science:

Microbiology
Biophysics
Pathogen Biology

Background:

Physical laws fundamentally constrain the size of all life forms.
Microorganisms, particularly larger ones, must evolve specific adaptations to thrive within these physical limits.
The size of pathogenic microorganisms can significantly influence their ability to infect hosts and evade immune responses.

Purpose of the Study:

To review recent research on the factors that influence microorganism size.
To examine the consequences of microorganism size on biological functions, especially for pathogens.
To synthesize current understanding of the interplay between physics, microorganism size, and microbial pathogenesis.

Main Methods:

Literature review of recent studies.

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In Situ Microscopy for Real-time Determination of Single-cell Morphology in Bioprocesses

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Analysis of physical principles governing biological size.

Examination of experimental and observational data on microorganism adaptations.

Main Results:

Large microorganisms (approaching 1mm) exhibit compensating features to adhere to physical laws.
Microorganism size impacts critical pathogenic attributes like host cell adherence and immune system evasion.
Various factors, both intrinsic and extrinsic, influence the size spectrum of microbial life.

Conclusions:

The size of microorganisms is a critical factor with profound implications for their survival and pathogenicity.
Understanding the physical and biological factors dictating microorganism size is essential for fields ranging from medicine to biotechnology.
Future research should continue to explore the adaptive strategies of large microorganisms and their impact on host-pathogen dynamics.