A Real-Time Multiplexed Microbial Growth Intervalometer for Capturing High-Resolution Growth Curves.
David C Vuono1, Bruce Lipp1, Carl Staub2
1Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV, United States.
Frontiers in Microbiology
|June 25, 2019
Summary
A new automated instrument, the MicrobiAl Growth Intervalometer (MAGI), measures microbial growth using photo-conduction. This cost-effective device offers sensitive, low-noise measurements for various organisms and conditions, advancing microbiological research tools.
Area of Science:
- Microbiology
- Biotechnology
- Instrumentation
Background:
- Traditional batch cultures are routine but lack automated growth curve measurement tools.
- Existing optical density (OD) methods use photo-attenuation, which can be less sensitive.
- Need for advanced, automated instruments for microbial growth monitoring.
Purpose of the Study:
- To introduce the MicrobiAl Growth Intervalometer (MAGI), a novel automated instrument for measuring microbial growth.
- To demonstrate MAGI's ability to measure microbial growth using photo-conduction.
- To showcase MAGI's versatility across different organisms, media, and conditions.
Main Methods:
- Developed the MicrobiAl Growth Intervalometer (MAGI) utilizing photo-conduction.
- Employed software-driven automation for sensitive, low-background noise measurements.
- Tested MAGI with *Escherichia coli* K-12, *Bacillus subtilis*, and *Intrasporangium calvum* C5 under various conditions.
Main Results:
- MAGI accurately measured growth curves for *E. coli* K-12, with reproducible growth rates and generation times.
- Detected morphological changes in *B. subtilis* via alterations in the growth curve slope.
- Successfully captured growth curves for *I. calvum* across diverse media, redox conditions, and low resource concentrations, including diauxic growth.
Conclusions:
- MAGI is a versatile, cost-effective, and robust platform for microbial growth monitoring.
- The photo-conduction method provides sensitive measurements, capable of detecting subtle biological changes.
- MAGI advances tools for environmental, clinical, and food science microbiology by enabling precise growth curve analysis.
More Related Videos
Related Concept Videos
01:28Bacterial Growth Curve
2.3K
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...
2.3K
01:27Microbial Growth Media
1.4K
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.
1.4K
01:29Methods for Controlling Microbial Growth
1.6K
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...
1.6K
01:29Factors Influencing Microbial Growth: pH
1.1K
Microorganisms are classified as acidophiles, neutrophiles, or alkaliphiles based on their pH growth preferences, reflecting their adaptations to specific environments. Maintaining a stable intracellular pH is critical for macromolecular stability and enzymatic activity, which can be challenged by external pH variations.Neutrophiles, such as Escherichia coli, grow optimally between pH 5.5 and 8.0. These microorganisms inhabit neutral or slightly acidic environments and employ mechanisms like...
1.1K
01:23Microbial Growth Measurement: Direct Methods
1.6K
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,...
1.6K
01:27Microbial Growth Measurement: Indirect Methods
1.4K
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...
1.4K