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Histology
Staining
| Term | Definition |
|---|---|
| What structures are attracted to a base-like stain? Terminology? | Acidic structures. basophilic |
| What are examples of basophilic structures? | Nucleic acids aka dna and rna. Organic Acids. Negatively charged structures. |
| Basophilic structures stain? | blue-purple color |
| What structures are attracted to a acid-like stain? Terminology? | basic structures. Acidophilic |
| What are examples of acidophilic structures? | collagen fibers, cytoplasmic proteins, mitochondria (membrane proteins) |
| Acidophilic structures stain? | pink-red color |
| The most common basophilic (base like stain) stain? | Hematoxylin |
| The most common acidophilic (acid like stain) stain? | Eosin |
| What specialized stain for chemical properties stain collagen fibers? Color? | Trichrome. blue or green . |
| What specialized stain for chemical properties stain carbohydrate-rich structures? Color? | Periodic acid-Schiff (PAS). Magenta |
| What are examples of carbohydrate-rich structures? | glycocalyx, glycosylated proteins. |
| what stains carbohydrate-rich structures? | Periodic acid-schiff - magenta |
| what stains stain collagen fibers? Color? | Trichrome. blue-green. |
| What is the specialized stain for glycosylated reticular fibers? Color? | Silver stain. Black. |
| What is the specialized stain for elastic fibers/fibroblasts? Color? | Orcein. Black or brown. |
| What makes lipids hard to stain? | They are normally lost during sectioning process. (dehydration with alcohol). Lipid rich areas look EMPTY aka fat cells. Two special techniques. |
| What are two stain names for lipids? | Sudan Red (stains red). and Osmic acid (stains black). |
| What is osmic acid used to stain? | Lipids |
| How are specimens prepared before viewing with microscope? 4 steps. | Fixation. Embedding. Thin sectioning. Staining. |
| Maximum resolving power of a light microscope? Limited by? | 0.2 micrometers. (um). Wavelength or energy of light. |
| Maximum resolving power of an electron microscope? Can improve resolution/max resolution by? | 3 nm. Making the wavelength of the electron beam shorter. |
| Transmission electron microscopy images show what kind of structure? | Internal structure. |
| Scanning electron microscopy images show what kind of structure? | External surface of structure. |