PPT-Membrane biology

Lecture 2 Cell Biology interactive media video or interactive 1 Cell biology 2014 revised 211 14 Note Lecture 2 handout Alberts et al 5th edition. Chin Wei Lim, PhD student. 1. Professor . Vassili. Toropov. 1,2. 1. School of Civil Engineering. 2. School of Mechanical Engineering. cncwl@leeds.ac.uk v.v.toropov@leeds.ac.uk. Faculty of Engineering. How signals are sent through the nervous system. Synapse. Synapse. = Junction between . two. connecting neurons. Synaptic cleft-between the neurons,. signal has to go across this space. Signals need to be sent . Prefixes, Suffixes, and Vocabulary. Diffusion . = the movement of particles from a high concentration to a low concentration. . Osmosis . = The diffusion of water. . . Hyper . = high, over. . . Hypo. -. Gateway to the Cell. 2. Photograph of a Cell Membrane. 3. Cell Membrane. The cell membrane is . flexible. and allows a . unicellular. organism to . move. 4. Homeostasis. Balanced. internal condition of cells. MEMBRANE. SEPARATION. TRANSPORT MODELS. Membrane s. elective : . Ability . to control the rate of permeation of different species. Permeation mechanism model. Solution-diffusion model. Permeants. . dissolve in the membrane material and then diffuse through the membrane down a concentration gradient. and Transport. Cell Membrane. Cell membrane- also called the . Plasma Membrane. Separates the cell from its surrounding . environment.  . Helps maintain homeostasis which is keeping the internal conditions constant. Summary. How do materials get across a cell's membrane. ?. It depends on the type of substance. Summary. Non-polar materials or hydrophobic materials . do. cross easily, especially if small. Ex – CO. Ch. 12, . Stryer. Short Course. Introduction to Membranes. Lipid structure makes a bilayer. Hydrophobic effect. Non-covalent structure. Fluidity of membrane: liquid crystal. Fluidity controlled by cholesterol, tail packing. Homeostasis & Cellular Transport. Function of the Cell Membrane:. Cell membrane separates the components of a cell from . its . environment. —surrounds the cell. “Gatekeeper” of the cell—regulates the flow of materials into and out of cell—. Pratt & . Cornely. , Ch. 9. Thermodynamics. Membrane potential—volts. For +1 ion, potential = 0.058V(log. ). If potential is negative, the inside of cell is more negative.  . Energetics of Transport. dr. . boudani. Généralités . Membrane plasmique ou plasmalemme . Enveloppe mince continue. Epaisseur : 75Å. Délimitant le milieu intracellulaire du milieu extracellulaire. En . MO. elle est repérable comme frontière entre MIC et MEC. Cell Membrane. .. The cell membrane . Controls. what comes out and . in of the cell. . It also provides protection.. The composition is a double layered sheet called a . Bi-lipid layer. .. This lipid bi-layer is made up of two . ;. . the. . study of . biology. at the . molecular. level.. Molecular biology. ;. . the. . study of . gene . structure and functions at the . molecular level. . to understand the molecular basis of hereditary, genetic variation, and the expression patterns of genes. . The cytology or cell biology. . (Gr., . Kytos. -hollow vessel or cell, logos- to discourse) is a biological science which deals with the study of cells from morphological, biochemical, physiological, developmental, .