![]() This is an important tool for the staining of Mycobacterium tuberculosis (TB), which can’t be Gram-stained. Several spore stains are available, but malachite green is probably the most popular. Because not all bacteria produce spores, this information can be useful in identification. ![]() This involves applying a stain to a bacterial sample to check for the presence of spores. ![]() Certain bacteria are Gram-variable and, therefore, aren’t amenable to Gram-staining. Typical Gram-positive bacteria include Bacillus, Staphylococcus, Streptococcus, and Clostridium spp., while Escherichia, Helicobacter, and Salmonella spp. This purple stain, based on the crystal violet dye, is named after the Danish bacteriologist Hans Christian Gram, who developed it. ![]() Gram staining is often the go-to test in bacterial identification. Here’s an overview of the most popular microbiological stains. Cytology microscopes have specific requirements to ensure clear differentiation between stained cells. Stains enable easier visualization under a microscope.
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