How Do You Spell NOVY-MCNEAL BLOOD AGAR?

Pronunciation: [nˈə͡ʊvimək nˈiːl blˈʌd ˈe͡ɪɡɑː] (IPA)

The correct spelling of the word "Novy-McNeal blood agar" is [ˈnɒvi məkˈniːl blʌd ˈeɪɡə]. The IPA phonetic transcription helps to understand the pronunciation of the word. Novy-McNeal blood agar is a type of microbiological agar used to isolate and culture bacteria. It contains a mixture of nutrients and sheep's blood that assist in the growth of bacteria. The agar is named after two American bacteriologists, Albert Novy and William McNeal, who first developed it in the early 1900s.

NOVY-MCNEAL BLOOD AGAR Meaning and Definition

  1. Novy-McNeal blood agar is a specialized culture medium commonly used in laboratory settings for the cultivation and isolation of fastidious microorganisms, particularly those responsible for causing respiratory infections. It is essentially a nutrient-rich agar base supplemented with blood, which provides the necessary nutrients and growth factors required for the growth of various bacteria.

    The primary components of Novy-McNeal blood agar include tryptic soy agar, yeast extract, and a small amount of hemoglobin or blood. The agar base provides a solid matrix, allowing the microorganisms to grow and form visible colonies. The yeast extract serves as an additional nutrient source, promoting the growth of fastidious organisms that require specific growth factors not typically found in other standard culture media.

    The addition of blood or hemoglobin to the agar allows for the detection of two distinct types of hemolysis based on the lysis of red blood cells by certain bacteria. These types are α-hemolysis, characterized by a greenish discoloration around the colonies, and β-hemolysis, which appears as a clear, transparent zone surrounding the colonies. This information aids in the identification and differentiation of various bacteria.

    Novy-McNeal blood agar is particularly useful for the cultivation of pathogens such as Streptococcus pneumoniae, Haemophilus influenzae, and Neisseria gonorrhoeae. Its selective and differential nature enables the detection and characterization of these microorganisms based on their specific hemolytic patterns and colony morphology.

    In summary, Novy-McNeal blood agar is a specialized culture medium that facilitates the growth and identification of fastidious microorganisms responsible for respiratory infections, based on their ability to lyse red blood cells and their unique colony characteristics.

  2. See under agar.

    A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.

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