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Related Experiment Videos

The physiological function of nitrate reduction in Clostridium perfringens.

S M Hasan, J B Hall

    Journal of General Microbiology
    |March 1, 1975
    PubMed
    Summary

    Nitrate enhances Clostridium perfringens growth by acting as an electron acceptor, boosting energy metabolism through substrate-level phosphorylation. This primitive anaerobic respiration has significant evolutionary implications for these bacteria.

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    Area of Science:

    • Microbiology
    • Bacterial Physiology
    • Evolutionary Biology

    Background:

    • Clostridium perfringens is an anaerobic bacterium.
    • Energy metabolism in anaerobic bacteria is crucial for growth.
    • Nitrate's role as an electron acceptor in bacterial metabolism is not fully understood for all species.

    Purpose of the Study:

    • To investigate the effect of nitrate on the fermentation balance of Clostridium perfringens.
    • To determine if nitrate can serve as an electron acceptor for Clostridium perfringens.
    • To explore the implications of nitrate reduction on bacterial growth yields and energy metabolism.

    Main Methods:

    • Fermentation-balance studies were conducted on Clostridium perfringens cultures.
    • Cultures were grown in media with and without the addition of nitrate.
    • Metabolite profiles and growth yields were analyzed.

    Main Results:

    • Nitrate significantly increased the growth yields of Clostridium perfringens.
    • Nitrate served as an effective electron acceptor, facilitating increased substrate-level phosphorylation.
    • Nitrate reduction was coupled to energy metabolism and was non-assimilative.

    Conclusions:

    • Nitrate reduction in Clostridium perfringens represents a primitive form of anaerobic respiration.
    • This metabolic capability enhances bacterial growth yields.
    • The findings suggest significant evolutionary implications for energy metabolism in anaerobic bacteria.

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