TECHNO-SCIENCE
miércoles, 4 de mayo de 2011
martes, 26 de abril de 2011
Cell Menbrane
Fluid Mosaic Model
A mixed composition or a mosaic of phospholipids, glycolipids, sterols and proteins.
Transport Proteins
Passively let specific solutes diffuse through a menbrene-spanning channel in their interior or actively pump them through.
Recetor Proteins
Recognition Proteins
Indentify the type of substances that enter the cell.
Adhesion Proteins
Comunication Proteins
Diffusion
The process by which molecules spread from areas of high concentratiion, to areas of low concentration. When the molecules are even throughout a space
Electric Gradient
Is a spatial variation of both electrical potential and chemical concentration across a membrane.
Pressure Gradient
Is a physical quantity that describes in which direction and at what rate the pressure changes the most rapidly around a particular location.
Osmosis
Is the movement of solvent molecules through a selectively-permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides.
Hypotonic Solution
Is the same as the solute concentration of another solution with which it is compared.
Hypertonic Solution
Isotonic Solution
Hydrostatic Pressure
Is the pressure exerted by a fluid at equilibrium due to the force of gravity.
Osmotic Pressure
Is the pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.
Endocytosis
Exocytosis
A vesicle moves to the cell surface, and then the protein-studded lipid bilayer of its menbrane.
Phagocytosis
("cell eating")
miércoles, 6 de abril de 2011
Cell Structure and Funtion
Nucleoid
Region of the cytoplasm that is not enclosed in a menbraneous sac
Lipid bilayer
Is a continuous, oily boundary that prevent the free passage of water-soluble substances.
Wavelength
Is the distance from the peak of one wave to the peak behind.
Use magnetic lense to bend and diffract beams of electron.
Transmittion electron microscope
Pass throught an specimen and is use to make images of internal details.
Scanning electron microscope
A beam of electron back and forth across a surface of the specimen, which has been given a thin metal coating.
Organelles
Start out life with a nucleus and other menbrane.
Secretory Pathway
Polypeptide chains from some ribosomes, through ER , and Golgi bodies and out of the cell.
Endocytic pathway
Move ions and molecules into cytoplasm.
Vesicles
Tiny sacs.
Nuclear envelope
Is a double menbrane in which two lipids bilayers are pressed against each other.
Nucleolus
Is a non-membrane bound structure composed of proteins and nucleic acids found within the nucleus.
Chromatic
Cell collection and all proteins associated with it.
Peroxisomes
Are organellesfound in virtually all eukaryotic cells. They are involved in the catabolism ofvery long chain fatty acids, branche chain fatty acids D-amino acids polyamines, and biosynthesis of plasmalogens.
Cell Junctions
Are mollecular structure whre cell send and receives signals or materials or recognizes and glues itself to alls.
Basal Body
Is an organelleformed from a centriole, and a short cylindrical array of microtubules
Pseudopods
False feet.
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