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Related Concept Videos

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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Chemical Agents for Microbial Control01:27

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Chemicals play important roles in controlling microbial growth by targeting microbial structures and functions as sanitizers, antiseptics, disinfectants, and sterilants.Alcohols are commonly used sanitizers, effectively disrupting lipid membranes, which compromises cell integrity. They are also used as antiseptics and disinfectants due to their rapid action and versatility.Phenols and their derivatives phenolics , known for denaturing proteins and disrupting cell membranes, are particularly...
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Biological Methods for Microbial Control01:28

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Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
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Physical Methods for Controlling Microbial Growth: Temperature01:23

Physical Methods for Controlling Microbial Growth: Temperature

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Heat is a widely used method to control microbial growth by targeting and denaturing cellular proteins, thereby killing or inactivating microbes. This method's effectiveness is quantified using parameters such as the thermal death point (TDP), thermal death time (TDT), and decimal reduction time (D value). TDP represents the lowest temperature at which all microorganisms in a liquid suspension are eliminated within 10 minutes, whereas TDT is the time necessary to achieve sterilization at a...
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Physical Methods for Controlling Microbial Growth: Radiation and Filtration01:26

Physical Methods for Controlling Microbial Growth: Radiation and Filtration

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Radiation and filtration are essential tools for microbial control, targeting microorganisms through distinct mechanisms. Radiation eliminates microbes by damaging their DNA, either killing them or inhibiting their growth. Based on wavelength, radiation is classified into two types: nonionizing and ionizing radiation.Non-ionizing radiation, such as UV radiation (200–400 nm), is absorbed by DNA, causing defects that effectively disinfect surfaces, air, and water, including safety cabinets.
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Plant Hormones01:56

Plant Hormones

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Plant hormones—or phytohormones—are chemical molecules that modulate one or more physiological processes of a plant. In animals, hormones are often produced in specific glands and circulated via the circulatory system. However, plants lack hormone-producing glands.
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Related Experiment Video

Updated: Jan 29, 2026

Electroantennographic Bioassay as a Screening Tool for Host Plant Volatiles
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Plant hosts control microbial denitrification activity.

Wafa Achouak1,2, Danis Abrouk3, Julien Guyonnet3

  • 1Aix Marseille Univ, CEA, CNRS, Laboratory for Microbial Ecology and Extreme Environment (LEMiRE), UMR7265 BVME, F-13108 Saint-Paul-lez-Durance, France.

FEMS Microbiology Ecology
|February 7, 2019
PubMed
Summary

Plant root exudates significantly influence soil microbes. Different plant species alter microbial communities and denitrification activity, with wheat and Arabidopsis showing a positive impact on nitrogen cycling genes.

Keywords:
active microbiotadenitrificationnitrogen uptakerhizosphererootroot exudatesroot-adhering soil

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Area of Science:

  • Microbial Ecology
  • Plant-Microbe Interactions
  • Environmental Microbiology

Background:

  • The rhizosphere hosts dynamic plant-microbe interactions, largely driven by root exudates.
  • Root exudates contain metabolites that can shape the functional capabilities of the rhizosphere microbiota.
  • Limited research has explored how root exudation influences the functional traits of soil microbial communities.

Purpose of the Study:

  • To investigate the impact of different plant species on the diversity of active rhizosphere microbiota.
  • To determine how root exudates influence the denitrification potential of soil microbes.
  • To analyze the effect of plant species on the expression of key denitrification genes (nirK and nirS).

Main Methods:

  • Cultivated four plant species (Triticum aestivum, Brassica napus, Medicago truncatula, Arabidopsis thaliana) in the same soil.
  • Extracted RNA from root tissues and associated soil for 16S rRNA metabarcoding to analyze bacterial diversity.
  • Quantified denitrification activity using gas chromatography and denitrification gene expression (nirK, nirS) via quantitative PCR.

Main Results:

  • Plant species significantly shape denitrification activity and the diversity of the active microbiota in the rhizosphere.
  • Triticum aestivum and Arabidopsis thaliana exhibited a positive influence on denitrification activity.
  • These two plant species also showed enhanced nirK gene expression in their root systems.

Conclusions:

  • Host plants exert significant control over microbial functional activities, specifically denitrification, through root exudation.
  • Root exudates are key mediators in shaping the functional potential of rhizosphere microbial communities.
  • Understanding plant-driven microbial modulation offers potential for agricultural and environmental applications.