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Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
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Updated: Jul 12, 2026

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae
09:12

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Published on: January 17, 2014

Physiological characterization of nutritionally variant streptococci.

R C Cooksey, F S Thompson, R R Facklam

    Journal of Clinical Microbiology
    |September 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Nutritionally variant streptococci require pyridoxal (vitamin B6) for optimal growth. These bacteria exhibit biochemical profiles similar to viridans streptococci, aiding in their identification.

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    Area of Science:

    • Microbiology
    • Bacteriology

    Background:

    • Nutritionally variant streptococci (NVS) are a group of bacteria with specific growth requirements.
    • Accurate identification and characterization of NVS are crucial for clinical and research purposes.

    Purpose of the Study:

    • To determine the growth requirements of NVS isolates.
    • To analyze the biochemical reactions of NVS.
    • To compare NVS biochemical profiles with known viridans streptococcal species.

    Main Methods:

    • Twenty-five NVS isolates were tested for growth on various media with and without pyridoxal hydrochloride.
    • Biochemical reactions were assessed using standard microbiological techniques.
    • Gas-liquid chromatography was employed to identify fermentation products.

    Main Results:

    • All NVS isolates grew in thioglycollate broth and Todd-Hewitt broth supplemented with pyridoxal.
    • NVS showed good growth on unsupplemented infusion agar, anaerobe blood agar, and chopped meat-glucose medium.
    • Biochemical patterns largely resembled five viridans streptococcal species, with two isolates showing distinct profiles.
    • Lactic acid and acetic acid were identified as major fermentation products.

    Conclusions:

    • Pyridoxal (vitamin B6) is essential for optimal growth of NVS in liquid media.
    • NVS share significant biochemical similarities with viridans streptococci, facilitating their classification.
    • Gas-liquid chromatography is effective in characterizing fermentation end-products of NVS.