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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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Microbial Growth Measurement: Direct Methods01:23

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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 community signatures for estimation of postmortem time intervals.

Hirak Ranjan Dash1, Surajit Das2

  • 1DNA Fingerprinting Unit, Forensic Science Laboratory, Bhopal, Madhya Pradesh, India.

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|April 24, 2022
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Summary

The human microbiome changes dramatically after death, offering new ways to estimate the postmortem interval (PMI). Studying these microbial shifts, known as the thanatomicrobiome, provides a powerful tool for forensic science.

Keywords:
CommensalsHuman microbiomePostmortem time intervalThanatomicrobiome

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Area of Science:

  • Forensic microbiology
  • Microbial ecology
  • Human decomposition

Background:

  • The human body hosts a complex ecosystem of symbiotic microorganisms.
  • Commensal microbes benefit the host by protecting against infections.
  • Postmortem changes significantly alter this microbial ecosystem.

Purpose of the Study:

  • To explore the successional changes in the human cadaver microbiome after death.
  • To evaluate the potential of thanatomicrobiome studies for estimating postmortem interval (PMI).
  • To summarize advancements in understanding postmortem microbial shifts for a consensus PMI estimation model.

Main Methods:

  • Analysis of microbial succession patterns in human cadavers.
  • Application of advanced molecular biological techniques.
  • Comparison of thanatomicrobiome studies with conventional PMI estimation methods.

Main Results:

  • Postmortem microbial communities undergo successional changes due to exogenous microbial invasion.
  • Thanatomicrobiome analysis offers a superior alternative to traditional PMI estimation techniques.
  • Advancements in molecular biology facilitate detailed studies of postmortem microflora.

Conclusions:

  • The dynamic changes in the human cadaver microbiome can be utilized for PMI estimation.
  • Molecular techniques provide a powerful approach to studying the thanatomicrobiome.
  • A consensus model based on microbial shifts shows promise for forensic investigations.