Lecture 6 - The Plasma Membrane
... depends on the degree of saturation in the fatty acid tails – Membranes rich in unsaturated fatty acids are more fluid than those rich in saturated fatty acids ...
... depends on the degree of saturation in the fatty acid tails – Membranes rich in unsaturated fatty acids are more fluid than those rich in saturated fatty acids ...
Chapter 7
... substances, even though those substances may not be very concentrated in the extracellular fluid. Embedded in the membrane are proteins with specific receptor sites exposed to the extracellular fluid. The receptor proteins are usually already clustered in regions of the membrane called coated pits, ...
... substances, even though those substances may not be very concentrated in the extracellular fluid. Embedded in the membrane are proteins with specific receptor sites exposed to the extracellular fluid. The receptor proteins are usually already clustered in regions of the membrane called coated pits, ...
Chapter 5: Homeostasis and Transport
... ions. Ions such as sodium (Na+), potassium (K+), calcium (Ca2+), and chloride (Cl-), are important for many cell functions. Because they are polar, these ions do not diffuse through the membrane. Instead they move through ion channel proteins where they are protected from the hydrophobic interior of ...
... ions. Ions such as sodium (Na+), potassium (K+), calcium (Ca2+), and chloride (Cl-), are important for many cell functions. Because they are polar, these ions do not diffuse through the membrane. Instead they move through ion channel proteins where they are protected from the hydrophobic interior of ...
The Cellular Level of Organization • Basic, living, structural and
... Comprises 75% of lipids Phospholipid bilayer = 2 parallel layers of molecules Each molecule is amphipathic (has both a polar & nonpolar region) – polar parts (heads) are hydophilic and face on both surfaces a watery environment – nonpolar parts (tails) are hydrophobic and line up next to each other ...
... Comprises 75% of lipids Phospholipid bilayer = 2 parallel layers of molecules Each molecule is amphipathic (has both a polar & nonpolar region) – polar parts (heads) are hydophilic and face on both surfaces a watery environment – nonpolar parts (tails) are hydrophobic and line up next to each other ...
Ch 7
... Early images from electron microscopes seemed to support the Davson-Danielli model, and until the 1960s, it was widely accepted as the structure of the plasma membrane and internal membranes. Further investigation revealed two problems. First, not all membranes were alike. Membranes differ in ...
... Early images from electron microscopes seemed to support the Davson-Danielli model, and until the 1960s, it was widely accepted as the structure of the plasma membrane and internal membranes. Further investigation revealed two problems. First, not all membranes were alike. Membranes differ in ...
Active Transport
... movement of water across the cell membrane. Important Point: Water has a tendency to move from areas of lower solute concentration (more pure water) to areas of higher solute concentration (less pure water). ...
... movement of water across the cell membrane. Important Point: Water has a tendency to move from areas of lower solute concentration (more pure water) to areas of higher solute concentration (less pure water). ...
Chapter 8 Cells and Their Environment Section 1 : Cell Membrane
... • Long-distance signals are carried by hormones and nerve cells. • Hormones are signal molecules that are made in one part of the body. • Hormones are distributed widely in the bloodstream throughout the body, but they affect only specific cells. • Nerve cells also signal information to distant loca ...
... • Long-distance signals are carried by hormones and nerve cells. • Hormones are signal molecules that are made in one part of the body. • Hormones are distributed widely in the bloodstream throughout the body, but they affect only specific cells. • Nerve cells also signal information to distant loca ...
Cell Membrane Structure
... This particular pump functions to maintain osmotic stability (ensuring the cells do not fill with water and burst nor become void of water and collapse), bio-electricity (maintenance of the voltage gradient across the membrane for nerve function), secondary active transport (Na+ is required to trans ...
... This particular pump functions to maintain osmotic stability (ensuring the cells do not fill with water and burst nor become void of water and collapse), bio-electricity (maintenance of the voltage gradient across the membrane for nerve function), secondary active transport (Na+ is required to trans ...
CHAPTER 4 FREE ENERGY AND CHEMICAL EQUILIBRIA
... Ligands in contact with the membrane will diffuse across the dialysis membrane, and move across until equilibrium is reached. Stirring speeds the equilibration. The binding site inside of the membrane or bag, maybe a macromolecule like Hemoglobin (Hb) or myoglobin (Mb) serves to concentrate the liga ...
... Ligands in contact with the membrane will diffuse across the dialysis membrane, and move across until equilibrium is reached. Stirring speeds the equilibration. The binding site inside of the membrane or bag, maybe a macromolecule like Hemoglobin (Hb) or myoglobin (Mb) serves to concentrate the liga ...
hydrophobic interaction chromatography.
... water on their surface to maintain solubility in aqueous solution. • This water masks hydrophobic groups that also exist on the protein surface. In the presence of reagents that are capable of binding water from the solvation shell (e.g. (NH4)2SO4), it is possible to disrupt solvation and expose the ...
... water on their surface to maintain solubility in aqueous solution. • This water masks hydrophobic groups that also exist on the protein surface. In the presence of reagents that are capable of binding water from the solvation shell (e.g. (NH4)2SO4), it is possible to disrupt solvation and expose the ...
Cellular Structures I
... V. Functions of Cell Membranes a. Basically the boundary of the cell, gives cell its basic integrity, controls all importing and exporting, regulates cell interactions (physically attached to many cells), communicating signals from one cell to another, transduces signals (some messengers don’t cross ...
... V. Functions of Cell Membranes a. Basically the boundary of the cell, gives cell its basic integrity, controls all importing and exporting, regulates cell interactions (physically attached to many cells), communicating signals from one cell to another, transduces signals (some messengers don’t cross ...
Membrane structure, I - UNT's College of Education
... Good Example - transport of Glucose into the Cell ...
... Good Example - transport of Glucose into the Cell ...
Facilitated diffusion is a process by which molecules are
... acids needed by the body are filtered in one part of the kidney. This filtrate, which includes glucose, is then reabsorbed in another part of the kidney. Because there are only a finite number of carrier proteins for glucose, if more glucose is present than the proteins can handle, the excess is not ...
... acids needed by the body are filtered in one part of the kidney. This filtrate, which includes glucose, is then reabsorbed in another part of the kidney. Because there are only a finite number of carrier proteins for glucose, if more glucose is present than the proteins can handle, the excess is not ...
Chapter 7 (Nov 12-13)
... substances, even though those substances may not be very concentrated in the extracellular fluid. Embedded in the membrane are proteins with specific receptor sites exposed to the extracellular fluid. The receptor proteins are usually already clustered in regions of the membrane called coated pits, ...
... substances, even though those substances may not be very concentrated in the extracellular fluid. Embedded in the membrane are proteins with specific receptor sites exposed to the extracellular fluid. The receptor proteins are usually already clustered in regions of the membrane called coated pits, ...
MEMBRANE POTENTIAL AND NERVE IMPULSE TRANSMISSION
... Sodium(Na+) and potassium(K+) are the main ions involved Na+ and K+ cannot pass through the lipid bilayer membrane move through the membrane by using membrane proteins (pumps) ...
... Sodium(Na+) and potassium(K+) are the main ions involved Na+ and K+ cannot pass through the lipid bilayer membrane move through the membrane by using membrane proteins (pumps) ...
Facilitated diffusion is a process by which molecules are
... acids needed by the body are filtered in one part of the kidney. This filtrate, which includes glucose, is then reabsorbed in another part of the kidney. Because there are only a finite number of carrier proteins for glucose, if more glucose is present than the proteins can handle, the excess is not ...
... acids needed by the body are filtered in one part of the kidney. This filtrate, which includes glucose, is then reabsorbed in another part of the kidney. Because there are only a finite number of carrier proteins for glucose, if more glucose is present than the proteins can handle, the excess is not ...
PHARMACOKINETICS
... in G.I. fluid, penetrates the epithelial cells --- any disease or food may effect this process) Transport of drugs across cell membrane biological membrane: - lipid bilayers with island of protein molecules Lipid soluble substances diffuse readily into cells since, they cross the cell membrane More ...
... in G.I. fluid, penetrates the epithelial cells --- any disease or food may effect this process) Transport of drugs across cell membrane biological membrane: - lipid bilayers with island of protein molecules Lipid soluble substances diffuse readily into cells since, they cross the cell membrane More ...
Membrane - Hinsdale South High School
... Cell (compared to beaker) hypertonic or hypotonic Beaker (compared to cell) hypertonic or hypotonic Which way does the water flow? in or out of cell AP Biology ...
... Cell (compared to beaker) hypertonic or hypotonic Beaker (compared to cell) hypertonic or hypotonic Which way does the water flow? in or out of cell AP Biology ...
Lipids affect the function of membrane proteins
... One challenge for simulations, Sansom says, is that lipids diffuse relatively slowly. For example, it takes several nanoseconds for two lipids to simply swap places in a membrane. In computational models, a nanosecond of real time takes on average 30 minutes of computing time. “If you want to properl ...
... One challenge for simulations, Sansom says, is that lipids diffuse relatively slowly. For example, it takes several nanoseconds for two lipids to simply swap places in a membrane. In computational models, a nanosecond of real time takes on average 30 minutes of computing time. “If you want to properl ...
ALE 4. Structure and Function of Cells and Cell Membranes
... 4. Why is it highly improbable that you will find a large predatory 40 kg cell on the slithering down the sidewalk? Hint: Discuss the selective advantage of cells being small and relate your response to how the surface area to volume ratio changes as cell size increases, and the efficiency of moveme ...
... 4. Why is it highly improbable that you will find a large predatory 40 kg cell on the slithering down the sidewalk? Hint: Discuss the selective advantage of cells being small and relate your response to how the surface area to volume ratio changes as cell size increases, and the efficiency of moveme ...
Optical measurement of cell membrane tension
... is referred to as the stabilized Hilbert phase microscopy (sHPM). The principle of the measurement extends the concept of complex analytic signals to the spatial domain by interfering the high-resolution microscope image field with a reference plane wave. The experimental geometry is depicted in Fig ...
... is referred to as the stabilized Hilbert phase microscopy (sHPM). The principle of the measurement extends the concept of complex analytic signals to the spatial domain by interfering the high-resolution microscope image field with a reference plane wave. The experimental geometry is depicted in Fig ...
Medical Application of Membrane in Drug Delivery Syestem
... • The drug release is controlled by transport of the drug across a membrane. • The transport is dependent on the drug diffusivity through the membrane and the thickness of the membrane • The membrane can be porous or non-porous and biodegradable or not. ...
... • The drug release is controlled by transport of the drug across a membrane. • The transport is dependent on the drug diffusivity through the membrane and the thickness of the membrane • The membrane can be porous or non-porous and biodegradable or not. ...
Lipids: Fats & Oils - R
... Limit the amount in your diet contributes to heart disease deposits in arteries ...
... Limit the amount in your diet contributes to heart disease deposits in arteries ...
Model lipid bilayer
A model lipid bilayer is any bilayer assembled in vitro, as opposed to the bilayer of natural cell membranes or covering various sub-cellular structures like the nucleus. A model bilayer can be made with either synthetic or natural lipids. The simplest model systems contain only a single pure synthetic lipid. More physiologically relevant model bilayers can be made with mixtures of several synthetic or natural lipids.There are many different types of model bilayers, each having experimental advantages and disadvantages. The first system developed was the black lipid membrane or “painted” bilayer, which allows simple electrical characterization of bilayers but is short-lived and can be difficult to work with. Supported bilayers are anchored to a solid substrate, increasing stability and allowing the use of characterization tools not possible in bulk solution. These advantages come at the cost of unwanted substrate interactions which can denature membrane proteins.