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Related Concept Videos

Biological Methods for Microbial Control01:28

Biological Methods for Microbial Control

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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: 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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Chemical Agents for Microbial Control01:27

Chemical Agents for Microbial Control

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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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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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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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Methods of Sterilization I: Physical Methods01:29

Methods of Sterilization I: Physical Methods

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As used in a healthcare facility, sterilization destroys all microorganisms through physical or chemical methods. The physical method includes steam, dry heat, boiling water, and radiation.
Steam sterilization uses non-toxic, low-cost moist heat in the form of saturated steam under pressure, which is fast, microbicidal, and sporicidal, and quickly warms and penetrates fabrics. Autoclaves, or steam sterilizers, expose each item to direct steam contact for a predetermined time at the necessary...
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Investigating the Detrimental Effects of Low Pressure Plasma Sterilization on the Survival of Bacillus subtilis Spores Using Live Cell Microscopy
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Spraying Small Water Droplets Acts as a Bacteriocide.

Maria T Dulay1, Jae Kyoo Lee1, Alison C Mody1

  • 1Department of Chemistry, Stanford University, Stanford, CA 94305, USA.

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Micron-sized water droplets effectively disinfect surfaces, inactivating over 98% of bacteria like E. coli and Salmonella. This novel method offers a safe and cost-effective alternative to traditional disinfectants.

Keywords:
BacteriocideE. coliS. typhimuriumdisinfectionmicrodropletsreactive oxygen species

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Area of Science:

  • Environmental Science
  • Microbiology
  • Materials Science

Background:

  • Disinfectants are crucial for controlling pathogen spread.
  • Conventional disinfectants can be costly, surface-incompatible, and generate hazardous by-products.

Purpose of the Study:

  • To investigate the potential of micron-sized water droplets as an effective disinfectant.
  • To evaluate the bactericidal efficacy of sprayed water droplets against common pathogens.

Main Methods:

  • Pure bulk water was nebulized into micron-sized droplets using coaxial airflow.
  • Droplets were sprayed onto stainless-steel discs contaminated with Escherichia coli and Salmonella typhimurium.
  • Bacterial inactivation was quantified and compared to control groups and hydrogen peroxide.

Main Results:

  • Spraying for 20 minutes inactivated over 98% of E. coli and S. typhimurium.
  • Control experiments (water stream or gas only) showed <10% inactivation.
  • 3% hydrogen peroxide achieved 55% inactivation, highlighting the superior efficacy of water droplets.

Conclusions:

  • Micron-sized water droplets demonstrate significant bactericidal activity.
  • Cell death is attributed to cell wall destruction, likely caused by reactive oxygen species and droplet surface charge.
  • This water droplet disinfection method presents a promising, eco-friendly alternative.