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Related Concept Videos

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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Methods of Sterilization II: Chemical Methods01:30

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In healthcare, the chemical method of sterilization uses chemical sterilants to treat surgical instruments and medical supplies to help prevent the transmission of infectious pathogens to patients. Due to heat sensitivity, most medical supplies and equipment should not be exposed to high temperatures. These parts include rubber, plastic, glass, and other similar elements.
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Physical Methods for Controlling Microbial Growth: Temperature01:23

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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

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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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Cleaning, Sterilization, and Disinfection01:30

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Cleaning, disinfection, and sterilization are the methods that help to break the infection chain and prevent disease.
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Updated: Sep 2, 2025

Investigating the Detrimental Effects of Low Pressure Plasma Sterilization on the Survival of Bacillus subtilis Spores Using Live Cell Microscopy
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Dry heat sterilization modelling for spacecraft applications.

Brian Flax1, Andrew Tortora1, Yen Yeung1

  • 1Microbiological Quality & Sterility Assurance, Johnson & Johnson, Raritan, New Jersey, USA.

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|August 6, 2022
PubMed
Summary
This summary is machine-generated.

A new dry heat sterilization model was developed for spacecraft, using heat-resistant spores and simulated Mars dust. This model enhances planetary protection strategies against microbial contamination during space exploration.

Keywords:
Bacillusdry heatinterplanetaryspacecraftsporessterilization

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Area of Science:

  • Microbiology
  • Aerospace Engineering
  • Planetary Science

Background:

  • Dry heat sterilization is crucial for spacecraft microbial inactivation.
  • Current methods are being re-evaluated for interplanetary missions.
  • Planetary protection requires robust sterilization against diverse microorganisms.

Purpose of the Study:

  • To develop a reliable antimicrobial model for dry heat sterilization of spacecraft.
  • To establish sterilization processes for interplanetary applications.
  • To enhance forward and backward planetary protection strategies.

Main Methods:

  • Experimental data on temperature and exposure time were used.
  • Bacillus atrophaeus and Bacillus canaveralius spores were tested.
  • D-value and Z-values were determined to create a mathematical model.
  • The model's efficacy was tested with simulated Mars dust.

Main Results:

  • A mathematical model for parametric sterilization was developed.
  • Bacillus canaveralius spores demonstrated higher heat resistance.
  • The model's practical application was verified with simulated Martian soil.
  • The model effectively reduces the risk of microbial contamination.

Conclusions:

  • The developed sterilization model is integral to risk reduction for interplanetary protection.
  • This model supports defining minimum criteria for engineering design in space exploration.
  • It offers a reliable method to mitigate known and unknown contaminants.