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Physical Methods for Controlling Microbial Growth: Radiation and Filtration01:26

Physical Methods for Controlling Microbial Growth: Radiation and Filtration

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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The Synergistic Effect of Visible Light and Gentamycin on Pseudomona aeruginosa Microorganisms
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THE EFFECT OF X-RAYS ON BACTERIA.

G L Clark, C S Boruff

    Science (New York, N.Y.)
    |July 19, 1929
    PubMed
    Summary
    This summary is machine-generated.

    X-rays effectively sterilize bacterial cultures, reducing microbial counts logarithmically. While Escherichia coli showed no mutation, Erythrobacillus prodigiosus exhibited pigment variation under irradiation.

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    Area of Science:

    • Microbiology
    • Radiation Biology

    Background:

    • X-rays are known to possess sterilizing properties.
    • Bacterial cultures are susceptible to various environmental factors, including radiation.
    • Understanding radiation effects on microorganisms is crucial for sterilization and biological research.

    Purpose of the Study:

    • To investigate the sterilizing effects of X-rays on bacterial cultures.
    • To determine if X-ray irradiation induces mutation or variation in specific bacterial species.
    • To observe and characterize any phenotypic changes in bacteria exposed to X-rays.

    Main Methods:

    • Cultures of Escherichia coli (B.coli) and Erythrobacillus prodigiosus were subjected to X-ray irradiation.
    • Bacterial counts were monitored over time to determine death-rate curves.
    • Colonies were observed for pigment production and genetic variation post-irradiation.
    • Phenotypic changes were assessed through subculturing and extended incubation periods.

    Main Results:

    • X-ray irradiation demonstrated logarithmic reduction in bacterial counts for both species, consistent with sterilization.
    • No significant variation or mutation was observed in Escherichia coli following X-ray treatment.
    • Erythrobacillus prodigiosus showed a tendency to lose its characteristic red pigment production with increased irradiation.
    • Pigment production was restored in most Erythrobacillus prodigiosus colonies after a five-day incubation or subculturing, indicating a reversible variation.

    Conclusions:

    • X-rays function as effective sterilizing agents against B.coli and E. prodigiosus.
    • B.coli appears genetically stable under X-ray exposure, showing no mutation.
    • E. prodigiosus exhibits phenotypic plasticity, with radiation-induced pigment loss being a reversible variation rather than a mutation.