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Related Concept Videos

Microbial Growth Measurement: Indirect Methods01:27

Microbial Growth Measurement: Indirect Methods

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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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Bacterial Growth Curve01:28

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The bacterial growth curve is a fundamental concept in microbiology that describes the dynamics of bacterial population growth in a closed system with controlled environmental conditions, such as temperature and nutrient availability. This curve is divided into four distinct phases: lag, log (exponential), stationary, and death phases, each reflecting a unique stage of bacterial adaptation and growth. During the lag phase, bacteria acclimate to their surroundings by synthesizing essential...
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Microbial Growth Measurement: Direct Methods01:23

Microbial Growth Measurement: Direct Methods

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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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Microbial Growth Media01:27

Microbial Growth Media

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Microbial growth media are essential tools in microbiology, providing the nutrients and conditions necessary to cultivate and study microorganisms. These media are categorized by their composition, consistency, and functional roles, enabling researchers to investigate microbial physiology, behavior, and interactions.Types and Consistencies of Growth MediaGrowth media can be solid, liquid, or semisolid. Solid media, often agar-based, allow visible colony growth for isolation and enumeration.
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Oxygen Requirements and Growth Patterns01:29

Oxygen Requirements and Growth Patterns

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Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
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Methods for Controlling Microbial Growth01:29

Methods for Controlling Microbial Growth

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Microbial growth control refers to various methods employed to inhibit, reduce, or eliminate microorganisms to ensure safety and hygiene across different settings. These methods are categorized based on the target environment and the level of microbial control required.Biocides are versatile agents designed to control microorganisms by either inhibiting their growth or outright killing them. These agents work through various physical, chemical, mechanical, or biological mechanisms. The...
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Saccharomyces cerevisiae Exponential Growth Kinetics in Batch Culture to Analyze Respiratory and Fermentative Metabolism
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Energetic scaling in microbial growth.

Salvatore Calabrese1, Arjun Chakrawal2,3, Stefano Manzoni2,3

  • 1Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843; salvatore.calabrese@ag.tamu.edu.

Proceedings of the National Academy of Sciences of the United States of America
|November 20, 2021
PubMed
Summary
This summary is machine-generated.

Microbial growth thermodynamics reveal how microbes efficiently convert energy into biomass. Dissipation mechanisms link energy conversion efficiency to electron donor uptake rate and growth yield.

Keywords:
energy dissipationenergy scalingmicrobial growththermodynamic efficiencythermodynamics

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Area of Science:

  • Microbial physiology and thermodynamics
  • Biochemical engineering
  • Systems biology

Background:

  • Microbial growth, a nonequilibrium process, presents complex metabolic networks challenging fundamental principle elucidation.
  • Understanding energy conversion and dissipation in microbial systems is crucial for ecological and biotechnological applications.

Purpose of the Study:

  • To systematically analyze microbial growth thermodynamics using an extensive dataset.
  • To develop a consistent thermodynamic framework for quantifying energy conversion and dissipation during microbial growth.
  • To establish relationships between thermodynamic efficiency, electron donor uptake rate, and growth yield.

Main Methods:

  • Analysis of an extensive dataset on energy-limited monoculture microbial growth.
  • Application of a thermodynamic framework based on reaction stoichiometry.
  • Quantification of energy conversion into biomass and energy dissipation into the environment.

Main Results:

  • A thermodynamic framework was established to quantify microbial energy conversion efficiency.
  • Thermodynamic efficiency was found to be related to the electron donor uptake rate by a specific scaling law.
  • The study successfully rederived the Pirt equation from a thermodynamic perspective, linking growth rate and yield.

Conclusions:

  • Microbial growth efficiency is fundamentally linked to energy dissipation mechanisms and electron donor uptake.
  • The findings provide a thermodynamic basis for understanding microbial growth yield and its relationship with growth rate.
  • This work offers general insights into microbial mass and energy conversion with broad applications in ecology and biotechnology.