Staining - Page 3 of 4 - Biology Notes Online

Types of Stain in Microbiology – Classification and Examples

Sourav Pan (M.Sc. in Microbiology) • Updated November 1, 2026 • 20 min read

Explore the types of stain in microbiology, including basic and acidic dyes, simple and differential staining, common examples, principles, and uses.

Wright-Giemsa Stain – Principle, Procedure, Results and Uses

Sourav Pan (M.Sc. in Microbiology) • Updated October 31, 2026 • 24 min read

Differential staining with eosin Y and azure B showing pink erythrocytes, purple leukocyte nuclei, and orange-red eosinophil granules.

Wright-Giemsa stain explained through its principle, components, blood smear procedure, staining results, applications, and differences from Giemsa stain.

Cell Membrane Staining – Principle, Dyes, Procedure and Applications

Sourav Pan (M.Sc. in Microbiology) • Updated October 31, 2026 • 28 min read

Cross-section of a plasma membrane showing lipophilic dyes associated with the lipid bilayer, fluorescent lectins bound to surface carbohydrates, and antibodies recognizing membrane proteins.

Cell membrane staining explained: principles, fluorescent dyes, antibody markers, live and fixed cell procedures, confocal imaging and applications.

Nuclear Staining: Principle, Types of Stains, Protocol, and Applications

Sourav Pan (M.Sc. in Microbiology) • Updated September 17, 2026 • 20 min read

Nuclear staining mechanisms showing DAPI and Hoechst binding the DNA minor groove, propidium iodide intercalating nucleic acids, and hematein–mordant staining nuclear chromatin.

Nuclear staining labels cell nuclei for microscopy and analysis. Learn its principle, common stains such as DAPI and Hoechst, protocol, uses, and limitations.

Cell Wall Staining – Principle, Methods, Procedure and Results

Sourav Pan (M.Sc. in Microbiology) • Updated October 30, 2026 • 18 min read

Comparison of bacterial cell wall staining results: pink-red walls in Chance's method, violet walls in Ringen's method, and red walls with blue cytoplasm in Dyar's method.

Cell wall staining explained with principles, reagents, procedures and results of Chance’s, Ringen’s and Dyar’s bacterial cell wall staining methods.

Propidium Iodide Staining – Principle, Procedure and Applications

Sourav Pan (M.Sc. in Microbiology) • Updated October 30, 2026 • 20 min read

Matched brightfield and PI fluorescence views showing all cells in the sample and red fluorescent nuclei in a subset of PI-positive cells.

Explore propidium iodide staining, its principle, reagents, procedures for flow cytometry and microscopy, fluorescence properties, and results.

Loeffler’s Method for Flagella Staining – Principle, Procedure and Results

Sourav Pan (M.Sc. in Microbiology) • Updated October 30, 2026 • 9 min read

Three-stage diagram showing a thin bacterial flagellum becoming coated with mordant and stained red with fuchsin.

Loeffler’s Method for flagella staining, including its principle, mordant and staining reagents, procedure, microscopic results, applications, and limitations.

Giemsa Stain: Principle, Composition, Procedure and Uses

Sourav Pan (M.Sc. in Microbiology) • Updated October 29, 2026 • 28 min read

Giemsa staining uses acidic and basic dyes to produce characteristic differences in the staining of cellular structures. Azure B–eosin interactions contribute to the purple Romanowsky effect.

Giemsa stain explained: principle, composition, preparation, thin and thick blood smear procedures, staining results, and laboratory applications.

Capsule Staining – Principle, Reagents, Methods, Procedure and Results

Sourav Pan (M.Sc. in Microbiology) • Updated October 29, 2026 • 17 min read

India ink particles remain outside the hydrated bacterial capsule, producing a clear zone between the cell and the dark background.

Capsule staining in microbiology: learn the principle, reagents, Anthony’s and Maneval’s methods, procedure, microscopic results, and bacterial examples.

Endospore Staining – Principle, Methods, Procedure and Results

Sourav Pan (M.Sc. in Microbiology) • Updated October 29, 2026 • 14 min read

Positive endospore staining shows green intracellular or free spores, while a negative preparation shows no visible green endospores. A negative result does not always exclude the ability of a bacterial species to form spores.

Endospore staining explained with its principle, Schaeffer–Fulton and Dorner methods, reagents, step-by-step procedure, microscopic results and limitations.