Stains in MeTHOD pREATICAL

the process of dyeing living tissues— in vivo means “in life” (compare with in vitro staining).

It works by letting certain cells or structures take on contrasting color(s), their form (morphology) or position within a cell or tissue can be readily seen and studied It involves colouring cells or structures that are no longer living. .

reveal cytological details that might otherwise not be apparent; however, staining can also reveal where certain chemicals or specific chemical reactions are taking place within cells or tissues.

Permeabilization - treatment of cells, generally with a mild surfactant, which dissolves cell membranes in order to allow larger dye molecules to enter inside the cell. • Fixation - serves to “fix” or preserve cell or tissue morphology through the preparation process. but most fixation procedures involve adding a chemical fixative that creates chemical bonds between proteins to increase their rigidity.

Common fixatives include formaldehyde, ethanol, methanol, and/or picric acid.

Mounting - involves attaching samples to a glass microscope slide for observation and analysis. Staining - application of stain to a sample to color cells, tissues, components, or metabolic processes.

Staining - application of stain to a sample to color cells, tissues, components, or metabolic processes.

Iodine - used as a starch indicator. When in solution, starch and iodine turn a dark blue color. • Malachite green - a blue-green counterstain to safranin in Gimenez staining for bacteria. This stain can also be used to stain spores. • Methylene blue - stains animal cells to make nuclei more visible.

Ethidium bromide - this stain colors unhealthy cells in the final stages of apoptosis, or deliberate cell death, fluorescent red-orange.

Neutral/Toluylene red

this stain is made by boiling Nile blue with sulfuric acid, which creates a mix of Nile red and Nile blue. The red accumulates in intracellular lipid globules, staining them red. This stain may be used on living cells.

• used in optical microscopy to stain lipids black.

a protein-specific fluorescent stain used in fluorescence microscopy. Muntjac skin fibroblast labeled with rhodamine phalloidin

a nuclear stain used as a counterstain or to color collagen yellow.

This approach requires only the primary antibody and a fluorphore-conjuated secondary antibody, and is the simplest form of signal amplification.

aggregate of cells is kept alive outside of the organism from which it was derived

used whenever cell and tissue components in animal and plant material have to be visualized.

used mainly in histology, cytology and microbiology but also in analyzing textile fibres, paper and other technical products.

involves colouring cells or structures that are no longer living. Certain stains are often combined to reveal more details and features than a single stain alone. Combined with specific protocols for fixation and sample preparation, scientists and physician

treatment of cells, generally with a mild surfactant, which dissolves cell membranes in order to allow larger dye molecules to enter inside the cell.

Fixation - serves to “fix” or preserve cell or tissue morphology through the preparation process. This process may involve several steps, but most fixation procedures involve adding a chemical fixative that creates chemical bonds between proteins to increase their rigidity. • Common fixatives include formaldehyde, ethanol, methanol, and/or picric acid.