Infobox Anatomy Name Hyoglossal membrane Latin GraySubject 242 GrayPage 1132 Image Caption Image2 Caption2 Precursor System Artery Vein Nerve Lymph MeshName MeshNumber DorlandsPre m 08 DorlandsSuf 12522755 The hyoglossal membrane is a strong fibrous lamina, which connects the under surface of the root of the tongue to the body of the hyoid bone . This membrane receives, in front, some of the fibers of the Genioglossi . External links eMedicineDictionary Hyoglossal membrane Gray s Category Head and neck Anatomy stub ... more details
Infobox Embryology Name Heuser& 39 s membrane Latin GraySubject GrayPage Image Caption Image2 Caption2 System CarnegieStage Days 12 Precursor GivesRiseTo extraembryonic coelom MeshName MeshNumber DorlandsPre m 08 DorlandsSuf 12522719 Heuser s membrane or the exocoelomic membrane is a short lived combination of hypoblast cells and extracellular matrix . At day 9 10, at the abembryonic pole, cells from the cytotrophoblast flatten to create a thin exocoelomic membrane known as Heuser s Membrane. It surrounds the exocoelomic cavity .i.e. it lines the inner surface of the cytotrophoblast. At days 11 to 12, there is further delineation of the trophoblastic cells giving rise to a layer of loosely arranged cells that inserts between Heuser s membrane and both syncytio and cytotrophoblast. Extraembryonic and fetal membranes Category Embryology anatomy stub ... more details
of the lipid bilayer are indicated by red and blue dots. A membrane protein is a protein molecule that is attached to, or associated with the membrane biology membrane of a cell biology cell or an organelle . More than half of all proteins interact with membranes. Function Biological membrane ... each other and interact. Such proteins are involved in immune response , for example. Membrane enzymes produce a variety of substances essential for cell function. Membrane receptor proteins .... Membrane transport protein Transport protein s play an important role in the maintenance of concentrations ... environment Main categories Membrane proteins can be divided into several categories ref name ... John Wiley and Sons isbn 978 0 470 48337 4 pages 128 ref Integral membrane proteins which are permanently bound to the lipid bilayer Peripheral membrane proteins that are temporarily associated with lipid bilayer or with integral membrane proteins Lipid anchored protein s bound to lipid bilayer bound ... with lipid bilayer and become reversibly or irreversibly membrane associated. A slightly different classification is to divide all membrane proteins to integral and amphitropic . ref name pmid10503244 ... membrane interactions review journal Mol. Membr. Biol. volume 16 issue 3 pages 217 235 year 1999 pmid ... peripheral proteins that interact with other membrane proteins rather than with lipid bilayer. Integral membrane proteins Integral membrane protein s are permanently attached to the membrane. They can ..., are proteins that are permanently attached to the lipid membrane and span across the membrane at least ... membrane s Disambiguation needed date October 2011 . The beta barrel s were found only in Bacterial outer membrane outer membrane s of Gram negative bacteria , lipid rich cell walls of a few Gram positive ... that are permanently attached to the lipid membrane from only one side and do not span across the membrane. Peripheral membrane proteins Peripheral membrane proteins are also known as extrinsic ... more details
Orphan date February 2009 Context date October 2009 Membrane ruffling also known as cell ruffling is the formation of a motile cell surface that contains a meshwork of newly polymerized actin filaments . It can also be regarded as one of the earliest structural changes observed in the cell. the GTP binding protein Rac is the regulator of this membrane ruffling. Changes in the Polyphosphoindositide metabolism and changes in Ca level of cell may also play an important role. a number of actin binding and organizing protein localise to membrane ruffles and potentially targets to transducing molecules. See also lamellipodia filopodia Category Cell biology biochem stub Biology Membrane Ruffling The ruffling of the plasma membrane is a characteristic feature of many actively migrating cells. When the membrane is unable to attach to the substrate, the membrane protrusion is recycled back into the cell. The ruffling of membranes is thought to be controlled by a group of enzymes known as Rho GTPases, specifically RhoA, Rac1 and cdc42. information from http www.reading.ac.uk nitricoxide intro migration dynamics.htm ... more details
Image Cell membrane detailed diagram 4.svg thumb 400px Illustration of a Eukaryote Eukaryotic cell membrane The cell membrane or plasma membrane is a biological membrane that separates the cytoplasm interior ... membrane is semipermeable membrane selectively permeable to ions and organic molecules and controls ... 29, 2011, chemists at Harvard University reported the creation of an artificial cell membrane. ref name JACS 20111229 cite journal last1 Budin first1 Itay last2 Devaraj first2 Neal K. title Membrane ... Chemists Synthesize Artificial Cell Membrane url http www.sciencedaily.com releases 2012 01 120125132822.htm ... 20120126 cite web author Staff title Chemists create artificial cell membrane url http www.kurzweilai.net chemists create artificial cell membrane date January 26, 2012 publisher Ray Kurzweil kurzweilai.net accessdate February 18, 2012 ref Function The cell membrane surrounds the cytoplasm of a cell ... for the cell and precludes the passage of macromolecule larger molecules . The cell membrane also plays ... matrix and other cells to help group cells together to form Tissue biology tissues . The membrane is Semipermeable membrane differentially permeable and able to regulate what enters and exits the cell, thus facilitating the membrane transport protein transport of materials needed for survival. The movement of substances across the membrane can be either passive , occurring without the input of cellular energy, or active, requiring the cell to expend energy in transporting it. The membrane also maintains the cell potential . The cell membrane thus works as a selective filter that allows only certain things to come inside or go outside the cell. To do so, the membrane employs a number ... sub 2 sub , oxygen O sub 2 sub , and water, can move across the plasma membrane by diffusion, which is a passive transport process. 2. Osmosis Because the membrane acts as a barrier for certain molecules and ions, they can occur in different concentrations on the two sides of the membrane. Such a concentration ... more details
Unreferenced date December 2009 The sacrococcygeal membrane is a tough fibrous Biological membranemembrane about 10mm long which extends from the inferior tip of the sacrum to the body of the coccyx in humans. It covers the inferior limit of the epidural space and is analogous to the ligamentum flavum found at other levels in the Spinal cord spine . It can be found at the apex of an equilateral triangle whose base is formed by the dimples overlying the sacro iliac joints. The cornua of the sacrum may be palpated with a finger the sacrococcygeal membrane lies between and inferior to these. DEFAULTSORT Sacrococcygeal Membrane Category Thorax Anatomy stub ... more details
Multiple issues wikify March 2012 unreferenced November 2006 orphan November 2009 In the scientific literature polar membrane has acquired two separate meanings. 1 A lipid biomembrane expressing polarity in the electrical sense. Such membranes can be manipulated chemically and their electrical properties can be studied by application of biophysical techniques. 2 A synonym for the bacteriological term Polar organelle . DEFAULTSORT Polar Membrane Category Membrane biology ... more details
about various membranes in living things the membranes surrounding cells cell membrane File Phospholipids aqueous solution structures.svg thumb 200px right Cross section view of the structures that can be formed by phospholipids in aqueous solutions A biological membrane or biomembrane is an enclosing or separating membrane that acts as a selective barrier, within or around a cell biology cell . It consists of a lipid bilayer with embedded integral membrane protein proteins that may constitute close to 50 of membrane content. ref cite book author Mark L. Latash title Neurophysiological basis of movement year 2007 publisher Human Kinetics Publishers isbn 978 0 7360 6367 8 ref The cellular membranes should not be confused with isolating Tissue biology tissues formed by layers of cells, such as mucous membrane mucous and Basement membrane basement membranes. Function Membranes in cells typically define enclosed spaces or cell compartment compartments in which cells may maintain a chemistry .... For example, the membrane around peroxisome s shields the rest of the cell from peroxide s, and the cell membrane separates a cell from its surrounding medium. Most organelle s are defined by such membranes, and are called membrane bound organelles. Probably the most important feature of a biomembrane ... function but are unable to diffuse freely across a membrane enter through a membrane transport ... of specialized plasma membrane s can separate cell from external environment apical membrane apical ... of a cell. See also Basement membrane Biofilm Bladder disambiguation Fetal membranes of amnion and chorion ... Membrane lipids Membrane protein Mucous membrane Osmosis S layer Serous membrane Tympanic membrane ... 08 00091 2 refend External links MeSH name Membranes DEFAULTSORT Biological Membrane Category Membrane biology Category Biological matter membrane bg ca Membrana biol gica cs Bun n membr na de Biomembran fr Membrane biologie he lb Biomembran ja no Biologisk ... more details
Infobox Anatomy Name Obturator membrane Latin membrana obturatoria GraySubject 128 GrayPage 476 Image Gray435.png Caption The obturator membrane. Image2 Caption2 System Precursor MeshName MeshNumber DorlandsPre m 08 DorlandsSuf 12522134 The obturator membrane is a thin fibrous sheet, which almost completely closes the obturator foramen . Its fibers are arranged in interlacing bundles mainly transverse in direction the uppermost bundle is attached to the obturator tubercle s and completes the obturator canal for the passage of the obturator vessels and nerve. The membrane is attached to the sharp margin of the obturator foramen except at its lower lateral angle, where it is fixed to the pelvic surface of the inferior ramus of the ischium , i. e., within the margin. Both obturator muscles are connected with this membrane. External links SUNYAnatomyFigs 17 03 11 NormanAnatomy lljoints NormanAnatomyFig hipjointposterior Gray s Joints of torso Category Joints anatomy stub fr membrane obturatrice ... more details
Orphan date February 2009 Citations missing article date March 2010 Ceramic membranes are a type of artificial membrane s made from inorganic materials such as alumina , titanium dioxide titania , zirconia oxides or some glassy materials . They are used in membrane operations . By contrast with polymeric membranes , they can be used in separations where aggressive media acids, strong solvents are present. They also have excellent thermal stability which makes them usable in high temperature membrane operations. Like polymeric membranes, they are either dense or porous. Dense membranes Dense ceramic membranes are used for the purpose of gas separation. Examples are the separation of oxygen from air, or the separation of hydrogen gas from a mixture. Porous membranes Porous ceramic membranes are chiefly used for gas separation and microfiltration micro or nanofiltration . They can be made from both crystalline as well as amorph ous solids. An example of an amorphous membrane is the silica membrane ref cite journal doi 10.1126 science.279.5357.1710 author R.M. de Vos and H. Verweij year 1998 title High Selectivity, High Flux Silica Membranes for Gas Separation journal Science volume 279 issue 5357 pages 1710 1711 pmid 9497287 bibcode 1998Sci...279.1710D ref . see also Artificial membrane References references DEFAULTSORT Ceramic Membrane Category Chemical engineering Category Membrane technology ... more details
Unreferenced stub auto date August 2011 An acoustic membrane is a thin layer that vibrations vibrates and are used in acoustics to produce or transfer sound, such as a drum , microphone , or loudspeaker . File Two dim standing wave.gif thumb rigth File Membrane exampleA.gif thumb left Physics stub Category Acoustics ar de Schwingungsmembran ... more details
more footnotes date September 2011 The membrane technology covers all process engineering measures for the transport of substances between two fractions with the help of Semipermeable membrane permeable Membrane selective barrier membrane s. That means in general mechanical separation process for separation of gaseous or liquid streams using membrane technology. Applications File Waldsassen Ultrafiltration.JPG ... ECMO scheme The particular advantage of membrane separation processes is that it operate without heating ... is possible. Therefore, the cold separation by membrane processes has been established ... of membrane separations realizeable that with thermal processes are not possible. For example ... on the type of membrane, the selective separation of certain individual substances or substance mixtures ... production. But also in wastewater treatment, the membrane technology is becoming increasingly important ... membrane oxygenation artificial lung for bubble free supply of oxygen in the blood . Also the importance of membrane technology is growing in the field of environmental protection NanoMemPro ... in the fuel cell or the osmotic power plant . Mass transfer For the mass transfer at the membrane ... that need to be transported must be first dissolved in the membrane. This principle is more important ... cell. During the filtration process is formed on the membrane a boundary layer . This concentration gradient is created by molecule s which can not pass through the membrane. This effect is referred ... flow flux . The concentration polarization is in principle reversible by cleaning the membrane and the initial flux can be almost restored. Also the use of a tangential flow to the membrane cross flow .... During this process the not passing particles or molecules are forming on the membrane a more or less a pulpy mass filter cake . This hampered by the blockage of the membrane the filtration. By the so ... flows along the front of the membrane and is separated by the pressure difference between the front ... more details
Unreferenced date December 2006 Infobox Anatomy Name Bruch& 39 s membrane Latin lamina basalis choroideae GraySubject GrayPage Image Caption Image2 Caption2 Map MapPos MapCaption Precursor System Artery Vein Nerve Lymph MeshName Bruch membrane MeshNumber DorlandsPre l 02 DorlandsSuf 12475917 Bruch s membrane is the innermost layer of the choroid . It is also called the vitreous lamina , because of its glassy microscopic appearance. It is 2 4 m thick. Layers Bruch s membrane consists of five layers from inside to outside the basement membrane of the retinal pigment epithelium the inner collagenous zone a central band of elastic fibers the outer collagenous zone the basement membrane of the choriocapillaris The retinal pigment epithelium transports metabolic waste from the Photoreceptor cell photoreceptors across Bruch s membrane to the choroid. Embryology Bruch s membrane is present by midterm in fetal development as an elastic sheet. Pathology Bruch s membrane thickens with age slowing the transport of metabolites. This may lead to the formation of drusen in age related macular degeneration . There is also a build up of deposits B asal Lin ear D eposits or BLinD and B asal Lam ellar D eposits BLamD on and within the membrane, primarily consisting of phospholipids. The accumulation of lipids appears to be greater in the central fundus than in the periphery. This build up seems to fragment the membrane into a lamellar structure more like puff pastry than a barrier. Inflammatory and neovascular mediators can then invite choroidal vessels to grow into and beyond the fragmented membrane. This neovascular membrane destroys the architecture of the outer retina and leads to sudden ... can also cause defects in Bruch s membrane which may lead to choroid choroidal neovascularization ... to defects in the Bruch membrane such as dot and fleck retinopathy. Eponym Bruch s membrane was named ... imm path samples sample11.asp Pictures at National Eye Institute Eye DEFAULTSORT Bruch s Membrane ... more details
About synthetic membranes for separation natural structures Biological membrane other uses of the term membraneMembrane disambiguation An artificial membrane , or synthetic membrane , is a synthetically created membrane which is usually intended for separation purposes in laboratory or in industry. Synthetic ... the middle of twentieth century. ref name Pi Pinnau, I., Freeman, B.D., Membrane Formation and Modification ..., T., Membrane Science and Technology , New York Marcel Dekker, Inc,1992. ref They can be produced ... and separated particles as well as a choice of driving force define a particular membrane separation process. The most commonly used driving forces of a membrane process in industry are pressure and concentration gradient s. The respective membrane process is therefore known as filtration . Synthetic ... name O The best known synthetic membrane separation processes include water purification , reverse ... , removal of microorganisms from dairy products, and dialysis . Membrane types and structure Synthetic membrane can be fabricated from a large number of different materials. It can be made from ... stability is the problem, due to the tendency of membrane liquids to evaporate or dissolve in the phases in contact with them. Polymeric membranes Polymeric membrane s lead the membrane separation ... are available, but the choice of membrane polymer is not a trivial task. A polymer has to have .... It has to be compatible with chosen membrane fabrication technology. ref name Z The polymer has to be a suitable membrane former in terms of its chains rigidity, chain interactions, stereoregularity ... the membrane performance characteristics. The polymer has to be obtainable and reasonably priced to comply with the low cost criteria of membrane separation process. Many membrane polymers are grafted ... common polymers in membrane synthesis are cellulose acetate , Nitrocellulose , and cellulose esters ... Polypropylene PP gallery File Ceramic membrane crossflow filtration .jpg thumb Ceramic multicanal ... more details
A family of biological membrane proteins which allow the passive movement of ions ion channels , water aquaporins or other solutes to passively pass through the membrane down their electrochemical gradient . References Molecular Biology of the Cell 4th ed. Alberts, B. Johnson, A. Lewis, J. Raff, M. Roberts, K. Walter, P. New York and London Garland Science c2002 See Glossary, under membrane channels . This book is available http www.ncbi.nlm.nih.gov books bv.fcgi?rid mboc4.TOC&depth 2 online Ion channels Category Membrane biology cs Kan l biologie de Membrankanal pl Kana b onowy ... more details
Orphan date March 2010 A Cargile membrane was a sterile membrane prepared from the peritoneum of the ox , and used in abdominal surgery to interpose between raw surfaces and thus prevent the formation of adhesions. It was also used to envelop freshly sutured nerves or tendon s, and to protect wounds. It is designed primarily to cover surfaces over which peritonium has been removed, especially where a sterile membrane would lessen the formation of adhesion. The membrane is available in size of 4X6 inches and sometimes is used as packaging or protective sheath. At present the use of such material is limited. It was named for Charles H. Cargile born 1853 , American surgeon. ref Dorland s Medical Dictionary ref References Reflist External links http query.nytimes.com mem archive free pdf? r 1&res 9404E6DB1739E333A25756C2A9669D946997D6CF 1908 NY Times story NIE DEFAULTSORT Cargile Membrane Category History of medicine Surgery stub ... more details
Infobox Anatomy Name Larynx Quadrangular membrane Latin membrana quadrangularis GraySubject GrayPage Image Gray954.png Caption The quadrangular membrane runs from the aryepiglottic fold to the vestibular ligament. Image2 Caption2 Precursor System Artery Vein Nerve Lymph MeshName MeshNumber DorlandsPre m 08 DorlandsSuf 12522179 The quadrangular membrane is a layer of submucosa. ref http anatomy.med.umich.edu nervous system deepneck pre.html Prelab Images Carotid Sheath, Pharynx, & Larynx Bot generated title ref It contains the cuneiform cartilages . ref http www.emory.edu ANATOMY AnatomyManual pharynx.html ref The membrane runs between the lateral aspects of the epiglottis and arytenoid cartilages on each side. The free inferior border of the quadrangular membrane is the vestibular ligament which is the vestibular fold when covered by mucosa. The superior border is in the aryepiglottic fold . References reflist External links NormanAnatomy lesson11 NormanAnatomyFig larynxmembranes Larynx anatomy Category Head and neck anatomy stub ... more details
Expert subject Chemistry date November 2008 A membrane reactor is a piece of chemical equipment that combines a catalyst filled reaction chamber with a Membrane technology membrane to add reactant s or remove products of the reaction. Chemical reactors making use of membranes are usually referred to as membrane reactors. The membrane can be used for different tasks Separation Selective extraction of reactants ... with distribution of reactants Membrane reactors are an example for the combination of two unit operation s in one step e.g. membrane filtration with the chemical reaction. Examples Biological systems ... of biological cell biology cells is achieved by membranes. The semi permeable membrane semi permeability allows to separate reactions and reaction environments. A number of enzymes are membrane bound and often mass transport through the membrane is active rather than passive as in artificial membrane .... The use of a natural membrane is the first example of the utilisation for a chemical reaction. By using ... to the principle of Le Ch telier s principle Le Ch telier . Size exclusion Enzyme Membrane Reactor As enzyme ... by size exclusion membrane filtration with ultra or nanofiltration artificial membranes . This is used ... by the difference of the chemical potential of the components in the membrane. The selectivity of the transport through the membrane is dependent by the difference in solubility of the materials in the membrane and their diffusivity through the membrane. For example for the selective removal of water ... reactor with an oxygen selective membrane. The membrane allows the uniform distribution of oxygen as the driving force for the permeation of oxygen through the membrane is the difference in partial pressures ... for example for clean coal power generation. Hydrogen, produced from coal gas in the membrane ... capture and storage . An alternative application of membrane reactors, developed at University ... a gaseous product in a membrane reactor generally affects the way that pressure affects the extent ... more details
Infobox Anatomy Name PAGENAME Latin membrana vitrea GraySubject GrayPage Image Schematic diagram of the human eye en.svg Caption Schematic diagram of the human eye . Vitreous membrane not labeled but it surrounds the vitreous, shown in dark blue. Image2 Gray883.png Caption2 The upper half of a sagittal section through the front of the eyeball. Vitreous membrane not labeled but region is visible. Precursor System Artery Vein Nerve Lymph MeshName MeshNumber DorlandsPre m 08 DorlandsSuf 12522332 The vitreous membrane or hyaloid membrane is a layer of collagen separating the vitreous humour from the rest of the human eye eye . At least two parts have been identified anatomically. The posterior hyaloid membrane separates the rear of the vitreous from the retina ref M P Snead, D R J Snead, A J Richards, J B Harrison, A V Poulson, A H C Morris, R M Sheard, J D Scott http www.nature.com eye journal v16 n4 full 6700198a.html Clinical, histological and ultrastructural studies of the posterior hyaloid membrane Eye , July 2002, Volume 16, Number 4, Pages 447 453. ref The anterior hyaloid membrane separates the front of the vitreous from the lens anatomy lens . ref Andres Bernal, Jean Marie Parel, Fabrice Manns http www.iovs.org cgi content full 47 11 4708?rss 1 Evidence for posterior zonular fiber attachment on the anterior hyaloid membrane Investigative Ophthalmology and Visual Science 2006, 47, 4708 4713. ref Bernal et al. describe it as a delicate structure in the form of a thin layer that runs from the pars plana to the posterior lens, where it shares its attachment with the posterior zonule via Wieger s ligament , also known as Egger s line . References references External links eMedicineDictionary vitreous membrane http www.ivy rose.co.uk Topics Anatomy Eye.htm Image at ivy rose.co.uk eye stub Category Eye anatomy ... more details
Image Beijing National Aquatics Centre 1.jpg thumb Water Cube in Beijing Membrane structures with 100 tons ETFE Foil Membrane structures are one sort of spatial structures made of tensioned membranes.The common membranes include fabrics such as PVC coated polyester fabric, translucent Polyethylene Fabrics, PVC coated glass fiber fabric and PTFE coated glass fiber fabric foils like ETFE foil and PVC foil. According to different form finding methods they can be divide into pneumatic structure, tensile membrane structure, cable dome.In these three kinds of membrane structures membranes work together with cables, columns and other construction members to find a form. There are also some constructions built with membrane, but it doesn t contribute to supporting the framework, such as the Beijing National Stadium . In this building the PTFE coated glass fiber fabric and ETFE foil are only filled into the space between large steel structures to build the large roof and facade. Membrane Structures are also referred to as tension fabric building . Another building beside it Beijing National Aquatics Center Water cube can be seen as one pneumatic membrane structure made of ETFE foil. Literature ETFE, Technology and Design, Annette LeCuyer, Verlag Birkh user, ISBN 978 3 7643 8563 7 Membrane Structures, Hrsg. Klaus Michael Koch, Verlag Prestel, ISBN 978 3 7913 3049 5 See also Tensile structure External links http tensileworld.com Tensileworld DEFAULTSORT Membrane Structure Category Architecture de Membranbau ja zh ... more details
Membrane computing is an area within computer science that seeks to discover new computational model s from the study of biological Cell biology cells , particularly of the cellular membrane s. It is a sub task of creating a cellular model . Membrane computing or MC deals with distributed and parallel computing models, processing multisets of symbol objects in a localized manner. Thus, evolution rules allow for evolving objects to be encapsulated into compartments defined by membranes. The communications between compartments and with the environment play an essential role in the processes. The various types of membrane systems are known as P systems after Gheorghe P un who first conceived the model in 1998. ref http psystems.disco.unimib.it download MembIntro2004.pdf ref An essential ingredient of a P system is its membrane structure, which can be a hierarchical arrangement of membranes, as in a cell .... P systems are often depicted graphically with drawings. File P System Membrane Format.pdf Nine Region Membrane Computer The intuition behind the notion of a membrane is a three dimensional vesicle from biology. However the concept itself is more general, and a membrane is seen as a separator of two regions. The membrane provides for selective communication between the two regions. As per George Paun ... the special symbol , in which case the membrane that contains it is dissolved and all its contents ... to define the architecture and the functioning of a membrane based multiset processing device are practically endless. Indeed the membrane computing literature contains a very large number of models ..., which is defined by a membrane, can contain other symbols or strings collectively referred to as objects or other membranes, so that a P system has exactly one outer membrane, called the skin membrane, and a hierarchical relationship governing all its membranes under the skin membrane. If objects .... Alternatively the result may be made up of objects sent out of the skin membrane to the environment ... more details
In biology, the membrane fluidity refers to the viscosity of the lipid bilayer of a cell membrane . The membrane phospholipid s incorporate fatty acid s of varying length and Saturation chemistry saturation . Shorter chain fatty acids, and ones with greater unsaturation, are less stiff, less viscous and have lower melting points . Changes in membrane dependent functions, such as phagocytosis and cell signalling , are hypothesized to depend upon the cell membrane fluidity. ref name pmid12646388 cite journal author Helmreich EJ title Environmental influences on signal transduction through membranes a retrospective mini review journal Biophysical chemistry volume 100 issue 1 3 pages 519 34 year 2003 pmid 12646388 doi 10.1016 S0301 4622 02 00303 4 url ref This hypothesis lost favor, but has re emerged recently with the discovery of discrete lipid domains, dubbed lipid rafts in cellular membranes ref name pmid15139814 cite journal author Simons K, Vaz WL title Model systems, lipid rafts, and cell membranes journal Annual review of biophysics and biomolecular structure volume 33 issue pages 269 95 year 2004 pmid 15139814 doi 10.1146 annurev.biophys.32.110601.141803 url ref See also Homeoviscous adaptation References Reflist 2 Category Membrane biology Category Lipids biochem stub ... more details
Image Diagram human cell nucleus.svg thumb 400px Human cell nucleus A nuclear membrane also known as the nuclear envelope , nucleolemma or karyotheca is a double lipid bilayer that encloses the genetic material in eukaryote eukaryotic cell biology cells . The nuclear membrane also serves as the physical barrier, separating the contents of the Cell nucleus nucleus DNA in particular from the cytoplasm . Many nuclear pore s are inserted in the nuclear envelope, which facilitate and regulate the exchange of materials protein s such as transcription factors, and RNA between the nucleus and the cytoplasm. Each of the two membranes is composed of a lipid bilayer . The outer membrane is continuous with the rough endoplasmic reticulum while the inner nuclear membrane is the primary residence of several inner nuclear membrane proteins inner nuclear membrane INM proteins . The outer and inner nuclear membrane are fused at the site of nuclear pore complexes. The structure of the membrane also consists of ribosomes. When the phospholipid bilayers become disconected from the pink matter in the brain nuclear pathways can become dislodged and back up nuclear pathways must be accessed in order for messages ... proteins.jpg thumb 400px The three layers of the nuclear membrane proteins. The nuclear pore complex ... the inner nuclear membrane. Chi et al. Journal of Biomedical Science 2009. ref name pmid19849840 ... 1423 0127 16 96 url http www.jbiomedsci.com content 16 96 ref The inner nuclear membrane is connected ... . The space between the two membranes that make up the nuclear membrane itself is called ... nm wide. The nuclear membrane has been postulated to play a role in the organization and transcriptional ... pores and transport through the nuclear membrane MeshName Nuclear membrane Structures of the cell membrane Nucleus Category Cell anatomy Category Nuclear substructures bg ca Membrana ... eu Gaineztadura nuklear fr Membrane nucl aire gl Envoltura nuclear hy it Membrana nucleare ... more details
Infobox Anatomy Name Basilar membrane Latin lamina basilaris ductus cochlearis GraySubject 232 GrayPage 1056 Image Organ of corti.svg Caption Section through organ of corti , showing basilar membrane Image2 ... Lymph MeshName Basilar membrane MeshNumber A09.246.631.246.125 DorlandsPre l 02 DorlandsSuf 12475936 The basilar membrane within the cochlea of the inner ear is a stiff structural element that separates ... in the cochlear ducts, with corresponding displacement and velocity waves on the basilar membrane ... they are kept strictly separated. This separation is the main function of Reissner s membrane between ... membrane in the hearing organ of all land vertebrates . However, the basilar membrane is in fact ..., New York, pp. 109 122 ref A base for the sensory cells The basilar membrane is also the base for the sensory .... This function gave the basilar membrane its name, and it is again present in all land vertebrates. Due to its location, the basilar membrane places the hair cells in a position where they are adjacent ... dispersion A third, evolutionarily younger, function of the basilar membrane is strongly developed ... frequencies spatially. In brief, the membrane is tapered and it is stiffer at one end than at the other. Furthermore, sound waves travelling to the far, floppier end of the basilar membrane have to travel ... of the basilar membrane, together with the surrounding fluid, can therefore be thought of as a mass ... of a certain frequency to vibrate some locations of the membrane more than other locations. As shown ... at the basal end of the cochlear coil, where the membrane is narrow and stiff, and low frequencies lead to maximum vibrations at the apical end of the cochlear coil, where the membrane is wider ... and its variants. Sound driven vibrations travel as waves along this membrane, along which, in humans .... When the vibration of the membrane rocks the triangular frames, the hairs on the cells are repeatedly ... of cochlear feedback spatial and temporal representation of a tone across the basilar membrane journal ... more details
Infobox Anatomy Name PAGENAME Latin paries vestibularis ductus cochlearis GraySubject 232 GrayPage 1054 Image Gray928.png Caption Diagrammatic longitudinal section of the cochlea. label is vestibular membrane Width 300 Image2 Cochlea crosssection.png Caption2 Cross section of the cochlea. System MeshName MeshNumber DorlandsPre p 06 DorlandsSuf 12615626 Reissner s membrane vestibular membrane , vestibular wall is a diaphragm acoustics membrane inside the cochlea of the inner ear . It separates scala media from scala vestibuli . Together with the basilar membrane it creates a compartment in the cochlea filled with endolymph , which is important for the function of the organ of Corti . It primarily functions as a diffusion barrier, allowing nutrients to travel from the perilymph to the endolymph of the membranous labyrinth . Histologically , the membrane is composed of two layers of flattened epithelium , separated by a basal lamina . Its structure suggests that its function is transport of fluid and electrolytes . Is this true? A source would be nice. Neurogeek. Reissner s membrane is named after German anatomist Ernst Reissner 1824 1878 . Additional images gallery Image Gray903.png Transverse section of the cochlear duct of a fetal cat. Image Gray929.png Floor of ductus cochlearis. Image Gray930.png Limbus lamin spiralis and membrana basilaris. gallery External links eMedicineDictionary vestibular membrane KansasHistology eye ear ear03 UIUCHistologySubject 76 http www.neurophys.wisc.edu h&b textbook chap 6.html Obj1 Overview at University of Wisconsin Madison http faculty.une.edu com abell histo cochleaw.jpg Image at University of New England, Maine Auditory system Category Auditory system Category Ear gl Membrana de Reissner id Membran Reissner ... more details
Encyclopedia
top
