Membranes

Membranes are Differentially Permeable
The plasma membrane is differentially permeable because some particles can pass through, others cannot. It can control the extent to which certain substances pass through.
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Cell membranes are built from lipids and proteins.
The Plasma Membrane
The plasma membrane serves as the interface between the machinery in the interior of the cell and the extracellular fluid (ECF) that bathes all cells.
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Here, we review several lines of evidence implicating membranes in the conversion of PrP, and summarize recent results from our own work on the role of lipid membranes in conformational transitions of prion proteins.
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membranes lining or covering a surface, including secretory glands
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
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The membranes of the thylakoids contain photosystems I and II which harvest solar energy in order to excite electrons which travel down the electron transport chain.
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The membranes of the mitochondrion divide the organelle into two distinct compartments: one within the interior of the mitochondrion, called the matrix, and a second between the inner and outer membranes, called the intermembrane space.
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Cell membranes act as barriers to most, but not all, molecules. Development of a cell membrane that could allow some materials to pass while constraining the movement of other molecules was a major step in the evolution of the cell.
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Four membranes (yolk sac, amnion, chorion, allantois) that support the developing embryo in reptiles, birds, and mammals.
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structural (membranes, fibers)
catalytic (synthesizing other structural macromolecules, lipids, polysaccharides, etc.; producing energy for these syntheses and for maintenance of the cell) ...
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thylakoids: membranes that make up the grana in chloroplasts; the actual site of photosynthesis within chloroplasts.
thymosins: hormones secreted by the thymus gland that influence the development of the T lymphocytes of the immune system.
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mediastinum The membranes enclosing the tissues and organs between the two lungs.
mediated transport. Transport of a substance across a cell membrane mediated by a carrier molecule in the membrane.
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Meninges the three membranes covering the brain and spinal cord
(sing = meninx; meninx = a membrane)
Meningitis inflammation (infection) of the meninges
(meninx = a membrane; -itis = inflammation of) ...
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shell membrane
The membranes of an egg that surround the yolk (ovum).
Covered in Lab 14 Gametogenesis and Development
shoot
The part of a vascular plant above the ground, consisting of stem and leaves.
Covered in Lab 8 Seed Plant Reproduction ...
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A method for transforrning DNA, especially useful for plant cells, in which high voltage pulses of electricity are used to open pores in cell membranes, through which foreign DNA can pass. Encapsidation.
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Ehlers Danlos Syndrome connective tissue condition including problems with tendons, ligaments, skin, bones, cartilage, and membranes surrounding blood vessels and nerves. Symptoms include joint laxity, elastic skin, dislocations.
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Endoplasmic reticulum - the cell's highway transport system composed of tubes and membranes connected to the nuclear membrane and extending through the cytoplasm that is also utilized for storing and separating ...
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Various quaternary amine polymers were screened to determine if membranes coated with such polymers would exhibit superior performance compared to commercially available nylon, PVDF, or nitrocellulose supports.
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[a thromboxane] thylakoid Closed cisterna, or disc, formed by the pigment-bearing internal membranes of chloroplasts. thymine dimer pyrimidine dimer. tissue culture Method by which cells derived from multicellular organisms are grown in liquid media.
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If we interpret those signal changes correctly we can learn something about these shape changes both of the protein and the membranes. So specifically what we are using in our lab is laser fluorescent microscopy.
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Membranes are laid onto each plate, and some of the bacteria from each colony stick, producing replicas of each colony in their original growth position).
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chorion - one of the four extraembryonic membranes of amniotes; it forms from the somatopleure (ectoderm and somatic mesoderm). In birds and reptiles, the membrane adheres to the shell and is highly vascularized to serve in gas exchange.
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A model used to conceptualise cell membranes, in it, the membranes are described as a structually and functionally asymmetric lipid bilayer studded with embedded proteins that aid in cross-membrane transport.
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DOT BLOT - DNA or RNA is simply spotted onto nitrocellulose or nylon membranes, denatured and hybridized with a probe.
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The material between the nuclear and cell membranes; includes fluid (cytosol) organelles, and various membranes.
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absorption -- The taking in of water and dissolved minerals and nutrients across cell membranes. Contrast with ingestion.
aerobic -- Pertaining to the presence of free oxygen. Aerobic organisms require oxygen for their life processes.
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An example is the formation of glycoproteins (used in cell membranes). Vesicles from the ER have proteins. In the Golgi Apparatus carbohydrates are attached to them creating glycoproteins.
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phospholipid - the major category of lipid molecules used to construct biological membranes. Generally composed of two fatty acids linked through glycerol phosphate to one of a variety of polar groups.
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meninges [L. meninx - membrane]. Membranes surrounding brain and spinal cord that have a protective function.
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[Gr. hypo - under, beneath; Gr. blastos - germ, bud shoot]. The inner layer of amniote blastoderm. Its cells usually become the endoderm of the extraembryonic membranes.
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Chloroplasts from cryptomonad algae have more than two membranes. Also, these chloroplasts contain what is called a nucleomorph, a DNA containing structure thought to be the vestige of a eukaryotic nucleus.
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