blot
1
0"Blot" most commonly refers to blotting, a widely used laboratory technique in molecular biology for identifying specific proteins, DNA, or RNA within a sample. It involves separating molecules by size using gel electrophoresis and then transferring (blotting) them onto a membrane for detection with probes.
Here is a breakdown of the different meanings and types:
1. Blotting Techniques (Molecular Biology)
Western Blot (Protein): Used to detect specific proteins in a sample, often to diagnose diseases or measure protein expression. It is a critical, semi-quantitative tool.
Southern Blot (DNA): A method used for detection of a specific DNA sequence in DNA samples.
Northern Blot (RNA): Used for the detection of specific RNA sequences to study gene expression.
Dot Blot: A simplified version where the sample is applied directly to the membrane without prior electrophoresis, allowing for rapid detection.
Common Steps in Blotting:
Sample Prep: Cells/tissues are lysed to extract macromolecules.
Electrophoresis: Samples are separated by size on a gel.
Transfer: Molecules are moved from the gel to a membrane (nitrocellulose or PVDF).
Blocking: The membrane is treated to prevent non-specific antibody binding.
Probing & Detection: Labeled antibodies or probes are used to identify the target molecule.
2. Historical/Religious Definition (Blót)
Definition: A blót is an Old Norse term for a pagan sacrifice or ritual feast, historically performed by Germanic peoples to worship gods, ancestors, or spirits.
Purpose: Often done to ensure fertility, a good harvest, or to ask for help, sometimes involving animal or, rarely, human sacrifices.
Modern Usage: Revived in contemporary Germanic paganism (heathenry), where it usually involves offerings of food or drink rather than blood sacrifice.
3. Other Meanings
Definition: A spot, stain, or smear.
Disney: The Phantom Blot is a classic Mickey Mouse villain—a criminal mastermind often depicted in a black, sheet-like costume.
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