Answer :

Non-pathogenic bacterial strains, such as Escherichia coli K-12 and Bacillus subtilis, are used extensively in laboratory research due to their safety and well-understood genetics.

Examples of widely used non-pathogenic bacterial strains include:

  • Escherichia coli strain K-12: This is the standard laboratory strain of E. coli and is used extensively in genetic and molecular biology research. It has been propagated and used safely in laboratories for over 70 years.
  • Bacillus subtilis: This gram-positive bacterium is used as a model organism for bacterial studies. Strain 168 is the reference strain commonly used in labs.
  • Lactobacillus species: These are used as probiotics and are involved in the fermentation of dairy products. They are beneficial for gut health.
  • Bifidobacterium species: Also used as probiotics, these bacteria help maintain a healthy intestinal flora.
  • Other examples include various strains of Bacilli, like Bacillus subtilis, which are useful in educational laboratory settings due to their safety.

These non-pathogenic bacterial strains provide valuable insights and applications in scientific research without posing a significant health risk.

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