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Related Concept Videos

Biofilms01:29

Biofilms

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Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
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Dry Friction01:30

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Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
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Drying Shrinkage01:21

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When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
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Characteristics of Dry Friction01:21

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Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
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Surface Tension and Surface Energy01:16

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When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
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Washing, Drying, and Ignition of Precipitates00:52

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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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Related Experiment Video

Updated: Jan 22, 2026

Biofilm Removal Using Carbon Dioxide Aerosols without Nitrogen Purge
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Difficulty in removing biofilm from dry surfaces.

F Parvin1, H Hu1, G S Whiteley2

  • 1Surgical Infection Research Group, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, NSW, Australia.

The Journal of Hospital Infection
|July 8, 2019
PubMed
Summary

Cleaning biofilms is harder than removing planktonic bacteria. A study showed 50 wipes removed only 96.66% of Staphylococcus aureus biofilms, unlike dried bacteria which were mostly removed in one wipe.

Keywords:
CleaningDry surface biofilmStaphylococcus aureusWiping

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Area of Science:

  • Microbiology
  • Infection Control
  • Biomaterials

Background:

  • Effective cleaning is crucial for preventing healthcare-associated infections.
  • Staphylococcus aureus is a common pathogen, often forming resilient biofilms.
  • Biofilm formation significantly increases bacterial resistance to antimicrobial agents and physical removal.

Purpose of the Study:

  • To compare the efficacy of a standardized wiping process in removing Staphylococcus aureus biofilms versus dried planktonic bacteria.
  • To quantify the number of wiping actions required to achieve significant reduction of both bacterial states.

Main Methods:

  • A standardized wiping process was applied to surfaces contaminated with Staphylococcus aureus.
  • Surfaces were contaminated with either dried planktonic bacteria or mature bacterial biofilms.
  • Bacterial reduction was quantified using colony-forming unit counts after a defined number of wiping actions.

Main Results:

  • A single wiping action removed over 99.9% (>3 log10) of dried planktonic Staphylococcus aureus.
  • Fifty wiping actions removed only 1.4 log10 (96.66%) of Staphylococcus aureus biofilm.
  • Biofilm removal was significantly less efficient compared to the removal of planktonic bacteria.

Conclusions:

  • Staphylococcus aureus biofilms present a substantially greater challenge for removal compared to dried planktonic bacteria.
  • Standard cleaning protocols may be insufficient for eradicating established bacterial biofilms.
  • Further research into effective biofilm decontamination strategies is warranted for improved infection control.