Eosin Methylene Blue
Eosin Methylene Blue - Related Videos
06:05
Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection
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Cited by 1 •
2017
Methylene blue dye injection into the renal pelvis facilitates the assessment of urinary tract junction obstruction defects during mouse embryonic urinary tract development. Here, a protocol for methylene blue dye injection into the renal pelvis is described.
03:47
Methylene Blue Dye Injection in Mouse Embryonic Urinary Tract: A Method To Assess the Congenital Obstruction in the Urinary Tract
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2025
In this video, we administer methylene blue dye injection into the urinary tract of a perinatal embryonic mouse to assess congenital anomalies related to urinary tract obstruction.
04:33
Methylene Blue Staining to Assess Metastatic Colony Formation In Vitro: A Staining Procedure to Assess Metastasis by Quantifying Harvested Cancer Cells From Cancer Mouse Model
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2025
In this video, we describe the methylene blue staining procedure to quantify the metastatic burden by counting stained colonies obtained by culturing cancer cells harvested from distant organs of a mouse model following injection.
01:21
Detection of Brain Atrophy by Hematoxylin and Eosin Staining
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2025
To detect brain atrophy, begin with slides carrying the deparaffinized brain sections from neurodegenerative mouse models at various ages.
07:51
The Application of 1% Methylene Blue Dye As a Single Technique in Breast Cancer Sentinel Node Biopsy
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Cited by 4 •
2019
In Indonesia, sentinel node biopsy (SNB) is not routinely performed for breast cancer surgery because of the limitation to provide radioisotope tracer and isosulfan or patent blue dye (PBD). To overcome this obstacle, we applied 1% methylene blue dye (MBD) as a single agent to map the sentinel nodes (SNs).
FAQs
The two dyes interact with biological materials according to their electrical charge. Acidic eosin and basic methylene blue bind differently to cellular structures, so regions with different chemical properties take up contrasting colors. This differential staining helps distinguish structures or microorganisms within a biological sample rather than presenting all material with a uniform appearance.
Methylene blue and eosin inhibit many Gram-positive bacteria, giving Gram-negative organisms a selective growth advantage on the agar. This selectivity is useful when a sample contains mixed microorganisms because it reduces interference from susceptible Gram-positive members. The resulting growth pattern can therefore support comparison of Gram-negative enteric bacteria within a more complex biological sample.
Lactose fermentation produces acidic conditions that alter the interaction of the dyes with growing colonies. Fermenters can consequently appear darker than nonfermenters, while strong fermenters may develop a distinctive metallic green sheen. These visible differences provide a differential readout, allowing lactose-fermenting and nonfermenting organisms to be compared by colony appearance.
A metallic green sheen is associated with strong lactose fermentation under the conditions created by the medium. It is an observable colony characteristic rather than a complete identification by itself. In biological analysis, the appearance can help flag organisms with strong fermentative behavior for comparison with other colonies that show darker, weaker, or no corresponding color development.
In a mixed culture, the medium combines selective inhibition with visual differentiation. Many Gram-positive organisms are suppressed, while Gram-negative colonies can be compared according to their lactose-associated color changes, including dark growth or a metallic green sheen. This combination helps separate colony types within the same sample and supports investigation of the sample's microbial composition.
Eosin methylene blue agar is useful when investigators need to examine Gram-negative enteric bacteria in environmental samples or assess potential fecal contamination. Its selective and differential properties provide both a growth pattern and colony appearance for comparison. The method therefore connects microbial observations with questions about sample composition and possible contamination, without relying on color alone for final interpretation.