Surface Stains
Surface Stains - Related Videos
11:33
Microscopy and Staining: Gram, Capsule, and Endospore Staining
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2023
Source: Rhiannon M. LeVeque1, Natalia Martin1, Andrew J. Van Alst1, and Victor J. DiRita1 1 Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, United States of America Bacteria are diverse microorganisms found nearly everywhere on Earth. Many properties help distinguish them from each other, including but not limited to Gram-staining type, shape and arrangement, production of capsule, and formation of spores. To observe these properties, one...
10:55
Staining Proteins in Gels
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Cited by 7 •
2008
Following separation by electrophoretic methods, proteins in a gel can be detected by several staining methods. Staining of proteins with Coomassie Blue, Silver Staining, SYPRO Orange, SYPRO Ruby are demonstrated in this video.
03:12
May-Grunwald Giemsa Staining: A Method to Stain Bone Marrow Cells
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2023
This video describes the technique of staining bone marrow cells using May- Grünwald Giemsa Staining. In the protocol, we will stain the murine myeloid leukemia cells, C149 cells, to analyze the morphology and differential counting.
01:16
Surface Tension and Surface Energy
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2023
When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension. Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
04:48
Sudan IV Staining: A Procedure for Staining Lipid-Laden Atherosclerotic Plaques in Harvested Mouse Aortic Arch
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2025
This video demonstrates a procedure using Sudan IV stain for staining the fatty deposits in the harvested mouse aortic arch to visualize the atherosclerotic plaques and determine the extent of atherosclerosis.
FAQs
Surface stains develop through different pathways, including adsorption, chemical reaction, corrosion, contamination, and biological growth. The dominant pathway depends on the material and on environmental exposure, temperature, and time. Considering these variables helps engineers decide whether a discoloration reflects a removable surface deposit or a change associated with the material’s condition.
They compare the stain’s appearance with its composition, distribution, and adhesion to the surface. A localized deposit that remains superficial may indicate contamination, whereas evidence of reaction or corrosion can point to a change in the material itself. This distinction matters because cleaning may address contamination, while degradation may require broader maintenance or failure analysis.
Adhesion indicates how strongly the discoloration or deposit is attached to the surface, providing a useful clue about its origin and treatment. Alongside appearance, composition, and distribution, adhesion helps separate superficial contamination from more persistent surface alteration. Engineers can use that distinction when considering cleaning decisions, assessing component condition, or evaluating protective coatings.
An investigation begins by documenting the stain’s appearance and distribution, then examining its composition and adhesion to the surface. Engineers interpret those observations in relation to the material, environment, temperature, and exposure time. The resulting assessment helps distinguish superficial contamination from a process that has altered or degraded the component, guiding the next maintenance or analytical decision.
Findings can support failure analysis, quality control, and cleaning or maintenance decisions. They also help engineers evaluate protective coatings by showing how surface conditions vary and whether discoloration may signal an issue requiring attention. Because stains can reflect contamination, reaction, corrosion, or biological growth, analysis connects a visible surface feature with the condition of the engineered component.
Surface stains can reveal environmental conditions that may shorten a component’s service life. Interpreting their composition, distribution, and adhesion alongside exposure temperature and duration helps engineers identify whether surrounding conditions promote contamination, reaction, corrosion, or biological growth. This context supports maintenance planning and evaluation of whether existing protection remains appropriate for the component’s operating environment.