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Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
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Hand hygiene

Asepsis is the practice of preventing or breaking the chain of infection. The nurse employs aseptic techniques to prevent the spread of microorganisms and reduce the risk of diseases. Hand hygiene is the cornerstone of aseptic techniques and is classified into medical and surgical asepsis. Medical asepsis includes hand hygiene and the use of gloves. Surgical asepsis, or the sterile technique, refers to practices that render and keep objects and areas free of microorganisms.
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Chemical Agents for Microbial Control01:27

Chemical Agents for Microbial Control

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...
Biological Methods for Microbial Control01:28

Biological Methods for Microbial Control

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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Antimicrobial Effectiveness

The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
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Antimicrobial Proteins

Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Related Experiment Video

Updated: Jul 5, 2026

Synthesis of Multi-walled Carbon Nanotubes Modified with Silver Nanoparticles and Evaluation of Their Antibacterial Activities and Cytotoxic Properties
11:19

Synthesis of Multi-walled Carbon Nanotubes Modified with Silver Nanoparticles and Evaluation of Their Antibacterial Activities and Cytotoxic Properties

Published on: May 10, 2018

Antibacterial silver.

J L Clement1, P S Jarrett

  • 1School of Chemistry and Applied Chemistry University of Wales College of Cardiff P.O. Box 912 Cardiff CF1 3TB United Kingdom.

Metal-Based Drugs
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

The antibacterial mechanisms of silver remain unclear, with contradictory findings on bacterial resistance. Further research is needed to understand silver

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Synthesis of Multi-walled Carbon Nanotubes Modified with Silver Nanoparticles and Evaluation of Their Antibacterial Activities and Cytotoxic Properties
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Area of Science:

  • Microbiology
  • Biochemistry
  • Materials Science

Background:

  • Silver exhibits known antibacterial activity with lower human cell toxicity, leading to applications in burn treatment and water disinfection.
  • The precise mechanisms of silver's antibacterial action and cellular uptake are not fully understood.
  • Information regarding bacterial resistance to silver is contradictory, and the chemistry of silver ions (Ag+) in biological systems is poorly characterized.

Purpose of the Study:

  • To investigate the poorly understood mechanisms of silver's antibacterial activity.
  • To explore the complex factors influencing bacterial resistance to silver.
  • To elucidate the chemistry of silver ions (Ag+) in biological and chemical systems.

Main Methods:

  • Analysis of silver binding to cellular components, comparing sensitive and resistant bacterial strains.
  • Investigation of plasmid-mediated silver resistance and its stability.
  • Examination of biochemical differences between resistant and sensitive bacterial strains, including cell surface properties.
  • Controlled experiments to assess the impact of cell culture media components (e.g., chloride) and silver compound solubility/stability on observed resistance.

Main Results:

  • Silver binds to various cellular components, with membrane interactions potentially more significant than nucleic acid binding.
  • Bacterial resistance mechanisms are complex and not fully elucidated; subtle differences like increased cell surface hydrophobicity were observed in resistant strains.
  • Experimental conditions, including the presence of chloride and the specific form and solubility of silver compounds, significantly influence observed silver resistance and toxicity.

Conclusions:

  • The antibacterial activity and resistance mechanisms of silver are intricate, influenced by silver's chemical form, solubility, and interactions with cellular and environmental components.
  • Further investigation into the interplay between silver's solubility, stability, and its interaction with bacterial cells is warranted to fully understand its efficacy and resistance.
  • Understanding these factors is crucial for optimizing silver-based antimicrobial applications and managing potential resistance development.