Gram Staining Procedure Animation Microbiology - Principle, Procedure, Interpretation

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Gram staining procedure animation - Principle, Procedure, Interpretation
Principle:
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Staining is an auxiliary technique used in microscopic techniques used to enhance the clarity of the microscopic image. Stains and dyes are widely used in the scientific field to highlight the structure of biological specimens, cells, tissues etc.
The most widely used staining procedure in microbiology is the Gram stain, discovered by the Danish scientist and physician Hans Christian Joachim Gram in 1884. Gram staining is a differential staining technique that differentiates bacteria into two groups: gram-positives and gram-negatives. The procedure is based on the ability of microorganisms to retain color of the stains used during the gram stain reaction. Gram-negative bacteria are decolorized by the alcohol, losing the color of the primary stain, purple. Gram-positive bacteria are not decolorized by alcohol and will remain as purple. After decolorization step, a counterstain is used to impart a pink color to the decolorized gram-negative organisms.
Importance of a Gram Stain:
---------------------------------------------
The Gram stain is a very important preliminary step in the initial characterization and classification of bacteria. It is also a key procedure in the identification of bacteria based on staining characteristics, enabling the bacteria to be examined using a light microscope. The bacteria present in an unstained smear are invisible when viewed using a light microscope. Once stained, the morphology and arrangement of the bacteria may be observed as well. Furthermore, it is also an important step in the screening of infectious agents in clinical specimens such as direct smears from a patient.
The Gram stain procedure enables bacteria to retain color of the stains, based on the differences in the chemical and physical properties of the cell wall.
1. Gram positive bacteria: Stain dark purple due to retaining the primary dye called Crystal Violet in the cell wall. Example: Staphylococcus aureus
2. Gram negative bacteria: Stain red or pink due to retaining the counter staining dye called Safranin.
Example: Escherichia coli
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[@alicetabbara-safid4559]

Excellent presentation, this will allow my students a clear understanding of how the mordant works in Gram staining. Thank you.

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thank you sir for this video I understand this concept in just 4-5 minutes that i am trying to understand from half an hour.

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[@indiraperezvalduciel7448]

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Day before exam❤

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What happens if you use acid alcohol as the decolorizing agent in spore staining?

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Microbiologist👍

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Glad you liked it

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Why must we dilute the samples from the agar plate?

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Please tell me to prepare smear and microscopic examination of staphylococcus lactobacillus and e coli and gram staining teqniq both are same please tell me tomorrow is my practical 😭😭

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[@carlosmarioocanagonzalez2314]

En mi experiencia realmente no es necesario cronometrar exactamente el tiempo con cristal violeta, iodo lugol y safranina debe de dejarse mínimo un minuto, pero realmente máximo tiempo no hay, y la decoloración no debe de ser hasta que deje de escurrir cristal violeta porque muchas veces y aunque se usen cepas jóvenes, se corre el riesgo de que se decolore a la fuerza, lo mejor es dejar derramar el chorrito de decolorante desde el inicio de la laminilla y permitir que llegue hasta el final de la misma, pasando por eso frotis ( que debe ser de buen tamaño y grosor) y de inmediato enjuagar. Crees ese es el "secreto" para una buena tinción.

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