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Topic: Microfilament


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In the News (Thu 20 Jun 19)

  
  Evolon® - the key benefits of microfilaments and the properties of Evolon microfilament fabric
These microfilaments also provide superior moisture management: water such as sweat is absorbed by Evolon®, the fabric then dries very quickly wicking moisture away from the skin.
Evolon®’s filtration ability is due to the dense, compact structure of tightly entangled microfilaments.
Evolon® microfilaments are up to 100 times thinner than a human hair, and 5 to 10 times thinner than some other microfiber.
www.evolon.com /microfilament-fabric-benefits.html   (820 words)

  
 Evolon® - a wide range of applications for microfilaments
Lint-free microfilament cloths and wipes provide unrivalled performance at cleaning, wiping and drying.
Bed linen and encasings made of Evolon® are comfortable, breathable and naturally anti-mite with no chemical additive.
A very breathable microfilament substrate for coating, suede and leather-like effects in shoe & luggage.
www.evolon.com /microfilament-applications.html   (134 words)

  
  Treadmilling of Actin Microfilament   (Site not responding. Last check: )
As you watch the animation, note that the microfilament is becoming longer on the left side (the + side) and shorter on the right side (the - side).
The microfilament is not actually "moving" in the sense that it would have momentum.
It is the "association" between the G actin monomers which form the microfilament which is moving in space and time.
bio.winona.edu /berg/ANIMTNS/treadmil.htm   (211 words)

  
  NationMaster - Encyclopedia: Microfilament   (Site not responding. Last check: )
Traditionally, the ends of a microfilament have been referred to as "pointed" and "barbed," a nomenclature that arises from the resemblance of microfilaments decorated with fragments of myosin II to arrowheads in the electron microscope.
Microfilaments, which are at least in part responsible for the morphological alterations, are significantly re-organized in transformed cells.
We previously found that caldesmon is disassociated from microfilaments as a result of its mitosis-specific phosphorylation by cdc2 kinase, and that expression of caldesmon is decreased upon cell transformation.
www.nationmaster.com /encyclopedia/Microfilament   (213 words)

  
 Light source with matrix of microfilaments - Patent 6812626
The tungsten microfilament may be laid continuously along all the metal tracks; nonetheless, it only reaches incandescence in the zones with the highest resistance between the ends of the rheophores, where the filament does not touch the track or is not parallel with the track.
The microfilaments are indicated with the reference number 7 and are carried by a grid of metal tracks 6 applied over the upper face of the substrate 2.
As can be seen, the microfilament extends over and at a distance from the surface of the reflecting cavity 4, supported at the end by supports 12 and connected electrically to the tracks 6 which are interposed between the intermediate layer 3 and the substrate 2.
www.freepatentsonline.com /6812626.html   (6369 words)

  
 * Microfilament - (Biology): Definition
The individual subunits of actin are known as globular actin (G-actin), while the filamentous polymer composed of G-actin subunits (a microfilament), is called F-actin.
The microfilaments are the thickest of the cytoskeleton, with only 7nm in diameter.
Microfilaments are fine, thread-like protein fibers, 3-6 nm in diameter.
en.mimi.hu /biology/microfilament.html   (376 words)

  
 Molecular Biology and Biochemistry Department Faculty Profile
Our research is aimed at understanding the molecular mechanisms of microfilament reorganization associated with the alterations of cell morphology seen during oncogenic transformation and during cell division.
Because caldesmon stimulates the actin binding activity of tropomyosin, and because tropomyosin stabilizes the structure of the microfilament, we hypothesized that the decrease in caldesmon expression in transformed cells, as well as the dissociation of caldesmon from microfilaments in mitotic cells, would destabilize microfilaments.
The functions of fascin in microfilament organization contrast with those of caldesmon: While caldesmon localizes mainly in stress fibers, fascin is present in filopodia, membrane ruffles and stress fibers.
www.rci.rutgers.edu /~molbio/faculty/yamashiro.html   (587 words)

  
 5. Understanding String Construction
Microfilament cores are made from even thinner fibers than those found in multifilament cores.
In fact, the microfilament core results in a string which is up to 10 percent thinner.
Microfilament construction yields a string with greater stretch capacity and power, but with no loss of strength.
www.ashawayusa.com /pages/BadTip5.html   (600 words)

  
 Soluble microfilament-generating multicomponent fibers patent invention
Microfilament fibers are used commercially in a variety of products such as filtration media, apparel, towels, and wipes.
In a preferred embodiment, the polymer component that is removed to form the microfilaments is a synthetic melt-processable polymer that is substantially soluble in water at a temperature of 70.degree.
The present invention provides an economical means for producing a fiber bundle of microfilaments or microfibers that can be easily dissolved in a relatively benign solvent at the end of its useful life, or the useful life of the article of manufacture incorporating the fiber bundle.
www.freshpatents.com /Soluble-microfilament-generating-multicomponent-fibers-dt20060420ptan20060083917.php   (1716 words)

  
 Myofibril Composition
Actin microfilaments are composed of the actin protein, while myosin microfilaments are composed of myosin proteins.
In fact, the actin microfilament is two of these chains of g-actin twisted up together, and the filamentous form is then called "f-actin." This is all depicted here in this schematic to the right; the two identical chains of actin are drawn in different colors only so that you can see how they come together.
You should also be able to see that the actin microfilament, although a doublet, is actually rather thin for its length (which would extend beyond the edges of your monitor)...
faculty.stcc.edu /AandP/AP/AP1pages/Units5to9/Unit7/myofibri.htm   (1536 words)

  
 World J Gastroenterol
K(V) Actin microfilaments regulate the activities of potassium channels, but they are not involved in the process of hyposmotic membrane stretch-induced increase of potassium currents in gastric antral circular myocytes of guinea pig.
Cytoskeleton is an intracellular superstructure that consists of microfilaments of actin and associated proteins, microtubules, and intermediate filaments.
These results indicated that actin microfilaments were not involved in the increase of potassium current induced by hyposmotic cell swelling in gastric circular myocytes of guinea pig.
www.wjgnet.com /1007-9327/10/3303.asp   (2364 words)

  
 Reference.com/Encyclopedia/Actin
The individual subunits of actin are known as globular actin (G-actin), while the filamentous polymer composed of actin subunits (a microfilament) is called F-actin.
The microfilaments are the thinnest component of the cytoskeleton, measuring approximately 7 nm in diameter.
Straub continued to work on actin and in 1950 reported that actin contains bound ATP and that, during polymerisation of the protein into microfilaments, the nucleotide is hydrolysed to ADP and inorganic phosphate (which remain bound in the microfilament).
www.reference.com /browse/wiki/Microfilaments   (1366 words)

  
 Textile World
In recent years, however, microfilament yarns have experienced an unbelievably sustained boom in that they have been applied to high-value but attractively priced, stylish silk-like garments.
Almost all microfilament yarns are spun from partially oriented yarn and subsequently false-twist drawn textured yarn (DTY).
A significant step in the improvement of microfilament yarn quality, especially yarn cleanliness during spinning, was achieved by the development of the MigraJet™ migration jet by Switzerland-based Heberlein Fiber Technology Inc. Its application provides for a reduction in the number of yarn breaks.
www.textileworld.com /News.htm?CD=3234&ID=10318   (705 words)

  
 Botany online: Intracellular Movements - Cytosceletons - Microfilaments
It seems certain that microfilaments participate in the protoplast currents of the stoneworts Chara and Nitella's internodal cells, in the chloroplast movements of Vallisneria and maybe in the pollen tube growth and the nuclear migration of Acetabularia, too.
They could prove that microfilaments are very common in plants, too, and that they develop clearly structured cytosceletons in the cells.
The pictures show that the fibrils are arranged in rows of three to four parallel filaments at the border between stationary ectoplasm (with fibrils) and mobile endoplasm.
www.biologie.uni-hamburg.de /b-online/e25/25a.htm   (1355 words)

  
 Publications   (Site not responding. Last check: )
The discharge consists of narrow channel (microfilament) terminated by expanding area of diffuse plasma.
The microfilament is located above the inter-electrode area; diffuse plasma covers the dielectric above the energizing electrodes.
The microfilament exhibits features of a normal glow discharge, including the negative glow and positive column.
www.muni.cz /research/publications/637328?page-width=free   (223 words)

  
 Role of LPS-induced microfilament depolymerization in MIP-2 production from rat pneumocytes -- Isowa and Liu 280 (4): ...
Fluorescent intensity of microfilaments was increased by the high concentration of CytoD in a time-dependent manner, but the filamentous structures were disrupted.
Jasp stabilized microfilaments in rat alveolar epithelial cells in a dose-dependent manner.
Because the microfilament is an important component for cell locomotion (8), many studies have focused on immune cells
ajplung.physiology.org /cgi/content/full/280/4/L762   (4876 words)

  
 Alterations in Endothelial F-Actin Microfilaments in Rabbit Aorta in Hypercholesterolemia -- Colangelo et al. 18 (1): ...
A and B, A field in the normal abdominal aorta is shown; C and D show a field in an intermediate lesion after 10 weeks of cholesterol feeding; and E and F, a field in an advanced lesion after 15 weeks of cholesterol feeding.
A and B, Normal renal artery is shown; C and D show renal artery flow divider with a minimal lesion with prominent microfilament bundles; E and F, renal artery flow divider with an intermediate lesion; and G and H, an advanced lesion with thin, wispy microfilament bundles (arrows).
In vitro reendothelialization of a single wound: role of microfilament bundles in rapid lamellipodia mediated wound closure.
atvb.ahajournals.org /cgi/content/full/18/1/52   (3554 words)

  
 Microfilament distribution in the maize male sterile mutants ms2 and polymitotic   (Site not responding. Last check: )
The role of microfilaments in cell wall formation through the progression of microsporogenesis was explored using two maize male sterile mutants.
Instead, microfilaments combine to form thick cables that display little contact with the membrane (Figure 1b), except for a small number of fine microfilaments that branch off actin cables, which are oriented parallel with the membrane.
At similar stages wild-type and po microfilament arrays are observed to extend throughout the cytoplasm, and to contact the cell membrane at many points.
www.maizegdb.org /mnl/72/28wolfe.html   (567 words)

  
 Deficiency in integrin-mediated transmembrane signaling and microfilament stress fiber formation by aging dermal ...
Previous evidence has shown a deficiency in microfilament stress fiber formation upon short-term cycloheximide treatment of cultured human dermal fibroblasts while cytoplasmic spreading appeared completely normal and other cytoskeletal networks organized normally.
This deficiency applied to collagen substrata (not fibronectin substrata) and was specific for in vitro-aged normal fibroblasts and for fibroblasts from three different Down's syndrome patients at any passage level.
This aging-related deficiency in integrin-mediated signaling can now be studied mechanistically with a variety of approaches to determine the nature of cell-surface molecules interacting with integrins (cis- and/or trans-acting molecules) that discriminate functional from nonfunctional receptors.
www.arclab.org /medlineupdates/abstract_1459206.html   (380 words)

  
 Micromachined Combustible Gas Detector
We are miniaturizing this technology, taking advantage of the economy of silicon microfabrication technology and the feasibility of integrating control and measurement circuitry, in addition to utilizing small size as a means to reduce power consumption and response time.
We are utilizing surface micromachining technology, fabricating microfilaments from polycrystalline Si films, with the finished microfilaments separated from the underlying Si substrate by a gap to provide thermal isolation.
Similar microfilaments have been explored as potential incandescent light sources and hot-wire anemometers, but we are the first to exploit them for chemical sensing purposes.
www.sandia.gov /mstc/technologies/microsensors/cgs.html   (632 words)

  
 [No title]
The formation of microfilament yarns production envisages a stagewise retrofitting of the existing equipment and mastering of new types of produce, i.e., multifilament textile yarns of low linear densities which are characterized by a high standard of consumer properties.
Microfilament yarns improve the consumer properties of the final textile goods which acquire such attractive advantages as: silky appearance and silky structure; long service life with consistent appearance; draping similar to natural fabrics; “peach-skin” effect after a special treatment procedure.
Due to their characteristics the microfilament yarns have similarity to natural yarns (silk, cotton, wool).
www.tobb.org.tr /rehber/belarus/9_Mogilevkhimvolokno_microfilament_eng.doc   (821 words)

  
 Dynamic Events Are Differently Mediated by Microfilaments, Microtubules, and Mitogen-Activated Protein Kinase During ...
Effects of microfilament and microtubule inhibitors on porcine oocyte maturation and fertilization.
Schatten G, Schatten H. Effects of motility inhibitors during sea urchin fertilization: microfilament inhibitors prevent sperm incorporation and reconstructing of the fertilized egg cortex, whereas microtubule inhibitors prevent pronuclear migrations.
Polymerization of nonfilamentous actin into microfilaments is an important process for porcine oocyte maturation and early embryo development.
www.biolreprod.org /cgi/content/full/64/3/879   (5825 words)

  
 Cortical granule translocation is microfilament mediated and linked to meiotic maturation in the sea urchin oocyte -- ...
Microfilaments are functional in oocytes prior to GVBD and cortical granule translocation.
Cortical granules are not associated with structural microfilaments prior to translocation.
Note refractile band of cortical granules in B, corresponding to immunolabeled cortical granules in A. Same scheme for C,D, except that prior to stratification, cells were treated with cytochalasin D, resulting in a slightly bulged centrifugal end, sometimes exaggerated for many µm (data not shown).
dev.biologists.org /cgi/content/figsonly/129/18/4315   (1211 words)

  
 src64 and tec29 are required for microfilament contraction during Drosophila cellularization -- Thomas and Wieschaus ...
The microfilament rings of wild-type embryos during late cellularization are round and constricted (G), whereas the microfilament rings of src64 mutant embryos are less rounded and are not constricted (H), similar to the microfilament rings of src64 mutant embryos during early cellularization (D).
The microfilament rings of wild-type embryos during late cellularization are round and constricted (A), whereas the microfilament rings of tec29 germline clone mutant embryos are less rounded and are not constricted (B).
In the absence of anillin, microfilament rings are not formed, but the disorganized microfilaments still have the ability to contract in the absence of bnk activity.
dev.biologists.org /cgi/content/full/131/4/863   (5626 words)

  
 Identification and isolation of Cryptosporidium parvum genes encoding microtubule and microfilament proteins.
Identification and isolation of Cryptosporidium parvum genes encoding microtubule and microfilament proteins.
Microtubules and microfilaments are highly conserved cytoskeletal polymers hypothesized to play essential biomechanical roles in the unusual gliding motility of Apicomplexan zoites and in their invasion of, and development within, host epithelial cells.
We have identified and isolated Cryptosporidium parvum genes encoding the microtubule proteins alpha- and beta-tubulin and the microfilament protein actin by screening a lambda gt11 C. parvum genomic DNA library with degenerate oligonucleotide and heterologous cDNA hybridization probes respectively.
www.aegis.com /aidsline/1992/sep/M9290845.html   (461 words)

  
 Encyclopédie :: Microfilament   (Site not responding. Last check: )
microfilament Any of numerous microscopic protein fibres, typicallycomponents of the cytoskeleton of eukaryotic cells.
Each microfilament consists of two helically twisted strands, each comprisingproteins to form three-dimensional networks.
Microfilaments often occur in abundance immediately beneath the plasma membrane, and play a role in cell motility, cytokinesis, and cytoplasmic streaming.
www.encyclopedie.cc /Microfilament   (107 words)

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