Staining Protocols
Staining Protocols - Related Videos
07:48
Staining Protocols for Human Pancreatic Islets
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Cited by 28 •
2012
This video demonstrates procedures for characterization of human pancreatic islets using hematoxylin and eosin (H&E) and immunohistochemistry (IHC). Pancreatic sections from head, body, and tail regions are stained by both H&E and IHC to determine islet endocrine composition (insulin, glucagon, and pancreatic polypeptide), cell replication (Ki67), and inflammatory infiltrates (H&E, CD3). The uncinate region is localized using IHC for pancreatic polypeptide.
08:33
A Protocol for Collecting and Staining Hemocytes from the Yellow Fever Mosquito Aedes aegypti
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Cited by 12 •
2011
A simplified yet accurate method to collect and stain mosquito hemocytes is described. Our method combines the simplicity of perfusion with the accuracy of high injection techniques to isolate clean preparations of hemocytes in Aedes mosquitoes. This method facilitates studies requiring knowledge of the types of hemocytes and their abundance.
09:37
Optimized Negative Staining: a High-throughput Protocol for Examining Small and Asymmetric Protein Structure by Electron Microscopy
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Cited by 71 •
2014
More than half of proteins are small proteins (molecular mass <200 kDa) that are challenging for both electron microscope imaging and three-dimensional reconstructions. Optimized negative staining is a robust and high-throughput protocol to obtain high contrast and relatively high resolution (~1 nm) images of small asymmetric proteins or complexes under different physiological conditions.
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...
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.
FAQs
Selective contrast depends on how a stain interacts with the sample. Differences in chemical binding, permeability, and retention cause some cells, tissues, microorganisms, or particulate features to hold more stain than others. These differences produce signals that can be distinguished by microscopy or related imaging, allowing environmental samples to reveal biological or structural variation.
Permeability influences whether a stain can enter the relevant part of a sample, while retention determines how much of the reagent remains after processing and washing. Together, these properties affect signal strength and contrast. Variation in either factor can change which features remain visible, so consistent sample handling is important when comparing environmental specimens.
A counterstain can add a second contrasting signal after the primary staining step. This helps distinguish stained features from surrounding material when a sample contains multiple components, such as microorganisms, biological material, or particulates. Its value is interpretive: added contrast can make differences between sample features easier to detect during imaging.
A typical sequence begins by preparing and fixing the sample, followed by exposure to one or more dyes or reactive stains. The sample is then washed to remove excess reagent and may receive a counterstain before imaging. Maintaining the intended order supports consistent chemical interaction, signal retention, and comparison among prepared samples.
Environmental researchers can apply these methods to characterize microbial communities, assess biological material in water or soil, and visualize structural or chemical features in environmental samples. The resulting images support investigations in monitoring, ecology, and pollution research by making selected sample components detectable and distinguishable through microscopy or related imaging.
Timing and reagent conditions affect how consistently samples develop detectable staining signals. If these factors vary between preparations, differences in color or contrast may reflect protocol variation rather than real differences in the environmental material. Standardized conditions therefore improve comparability and make staining results more useful for monitoring, ecological studies, and pollution research.