Video Experimental Relacionado
Updated: Jul 12, 2026
07:55
Chemical Isolation, Quantification, and Separation of Skin Lipids from Reptiles
Published on: February 7, 2019
Barrera lipídica al intercambio de agua en la epidermis de los reptiles
Science (New York, N.Y.)
|March 7, 1980
Resumen
La extracción de lípidos de la piel de la serpiente aumenta drásticamente la pérdida de agua, destacando los lípidos como cruciales para la piel de los reptiles.
Área de la Ciencia:
- Zoología Zoología Zoología.
- Dermatología Dermatología dermatología.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La piel de los reptiles es conocida por su baja permeabilidad, crucial para la supervivencia de los animales terrestres.
- Los componentes específicos responsables de esta función de barrera no están completamente aclarados.
Objetivo del estudio:
- Para investigar el papel de los lípidos epidérmicos en la permeabilidad cutánea al agua de la serpiente terrestre Elaphe obsoleta obsoleta.
- Para comparar la contribución de los lípidos frente a la estructura de la queratina a la pérdida de agua.
Principales métodos:
- Medición in vitro de la pérdida de agua cutánea después de la extracción de lípidos y la desnaturalización de la queratina.
- Análisis histológico de la epidermis.
- Cromatografía de capa delgada y gas-líquido de lípidos extraídos.
Principales resultados:
- La extracción de lípidos aumentó la pérdida de agua hasta 15 veces, mientras que la desnaturalización de queratina solo la duplicó.
- Los lípidos fueron identificados como una mezcla compleja de tipos polares y neutros dentro de la epidermis cornificada.
- La permeabilidad del agua se volvió similar en diferentes especies después de la eliminación de lípidos.
Conclusiones:
- Los lípidos son el componente principal responsable de la baja permeabilidad al agua de la piel de los reptiles.
- La estructura de la queratina y la morfología de la escala juegan un papel menor en la limitación del intercambio cutáneo de agua.
Videos de Conceptos Relacionados
01:57Adaptations that Reduce Water Loss
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
01:18Surface Membrane Barriers
The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
01:26Membrane Fluidity
Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
01:23Membrane Fluidity
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...
01:35Asymmetric Lipid Bilayer
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
01:31What are Lipids?
Lipids function as structural components of cellular membranes, in addition to acting as energy reservoirs and signaling molecules. They are thus crucial to all living organisms. The three biologically important classes of lipids are triglycerides, phospholipids, and steroids.
Non-Polar and Hydrophobic Characteristics of Lipids
Lipids are a structurally and functionally diverse group of hydrocarbons—compounds consisting of carbon and hydrogen atoms. The carbon-carbon and carbon-hydrogen bonds...
Non-Polar and Hydrophobic Characteristics of Lipids
Lipids are a structurally and functionally diverse group of hydrocarbons—compounds consisting of carbon and hydrogen atoms. The carbon-carbon and carbon-hydrogen bonds...