Dictionary > Gram-indeterminate bacteria

Gram-indeterminate bacteria

Definition
noun, singular: gram-indeterminate bacterium
Bacteria that do not respond to gram staining and, therefore, are indeterminate as either Gram-positive or Gram-negative
Supplement
Gram’s method or gram staining is a simple microbiological procedure that enables quick identification of bacterial species as either gram-positive or gram-negative. Bacterial cells that are violet in color from the primary staining (with crystal violet dye) under the microscope are called gram-positive. Bacterial cells that lose the violet color and take the counterstain color are called gram-negative bacteria. The differing color results in bacterial cells after gram staining are associated with the structural differences in bacterial cell’s outer covering. Gram-positive bacteria have a thick cell wall comprised of a lot of peptidoglycans and teichoic acids that enable them to retain the crystal violet colour. Gram-negative bacteria have less peptidoglycan. The crystal violet gram stain colour is easily lost from ethanol-alcohol mix during decolorization. Because of this, they can be stained with the safranin dye (pink) after counterstaining. There are certain bacteria that are not responding the same way to gram staining, such as acid fast bacteria. It is because they have a different type of cell envelope. The fatty acids in their cell wall resist gram staining. For this type of bacteria, Ziehl-Neelson staining method is used.
Compare:

See also:

  • gram staining


  • You will also like...

    running freshwater community
    Running Water Freshwater Community Factors

    This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..

    Consciousness and behavior
    Consciousness and Behavior

    Human consciousness and behavior are an interesting topic since they are determined and controlled by the brain. Conscio..

    New Zealand Fauna
    New Zealand’s Unique Fauna

    Meet some of New Zealand's unique fauna, including endemic insects, frogs, reptiles, birds, and mammals, and investigate..

    Gene Pool and Speciation
    The Gene Pool and Population Genetics

    According to Charles Darwin's theory of natural selection, preferable genes are favored by nature in the gene pool, and ..

    The process of photosynthesis
    Photosynthesis – Photolysis and Carbon Fixation

    Photosynthesis is the process that plants undertake to create organic materials from carbon dioxide and water, with the ..

    Population Growth and Survivorship
    Population Growth and Survivorship

    This lesson looks at population attributes, regulation, and growth. It also covers population genetics, particularly gen..

    Related Articles...

    No related articles found

    See all Related Topics