Results 241 to 250 of about 75,941 (270)
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Dysphagia Produced by a Contractile Ring in the Lower Esophagus
Gastroenterology, 1953Summary 1.In six male patients complaining of dysphagia, the responsible disorder appeared to be an annular esophageal constriction situated 0.5-2.5 cm. above the diaphragm. The constriction did not produce dysphagia unless it happened to trap a solid morsel of food, thereby occluding the esophageal lumen.
F J, INGELFINGER, P, KRAMER
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Journal of Experimental Biology, 2003
![Figure][1] What is the driving force within a living cell that allows separation of daughter cells during cytokinesis? In many eukaryotes cell division requires the formation of a contractile ring, composed of actin and myosin filaments, that generates force to cleave the cell.
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![Figure][1] What is the driving force within a living cell that allows separation of daughter cells during cytokinesis? In many eukaryotes cell division requires the formation of a contractile ring, composed of actin and myosin filaments, that generates force to cleave the cell.
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Wound-induced contractile ring: a model for cytokinesis
Biochemistry and Cell Biology, 2005The actomyosin-based contractile ring is required for several biological processes, such as wound healing and cytokinesis of animal cells. Despite progress in defining the roles of this structure in both wound closure and cell division, we still do not fully understand how an actomyosin ring is spatially and temporally assembled, nor do we understand ...
Hassina, Darenfed, Craig A, Mandato
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Cell and Tissue Research, 1970
Techniques of individual cell selection and precise ultramicrotomy have been employed to demonstrate that the contractile ring of cleaving HeLa cells is a transitory cytoplasmic organelle of distinctive fine structure and location. The contractile ring is an uninterrupted annulus encircling the equator of dividing cells exactly where the cleavage ...
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Techniques of individual cell selection and precise ultramicrotomy have been employed to demonstrate that the contractile ring of cleaving HeLa cells is a transitory cytoplasmic organelle of distinctive fine structure and location. The contractile ring is an uninterrupted annulus encircling the equator of dividing cells exactly where the cleavage ...
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Frequency of the Asymptomatic Lower Esophageal Contractile Ring
New England Journal of Medicine, 1956WITHIN recent years several papers have identified a ringlike narrowing or constriction in the terminal portion of the esophagus as a cause of dysphagia1 2 3 (Fig. 1). Although this narrowing had been observed before these reports and described as an annular indentation in the phrenic ampulla, little clinical significance was attached to its presence.4
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Plectin deposition at podosome rings requires myosin contractility
Cell Motility, 2008AbstractMetalloproteinase‐dependent tissue invasion requires the formation of podosomes and invadopodia for localized matrix degradation. Actin cytoskeleton remodeling via Arp2/3‐mediated actin polymerization is essential for podosome formation, and dynamic microtubules have an important role in maintaining podosome turnover in macrophages and ...
Annica, Gad +3 more
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Hydrodynamics of Cellular Cortical Flows and the Formation of Contractile Rings
Physical Review Letters, 2009We propose a mechanism for the formation of contractile rings and the apparition of a flow in the cortical layer of cells undergoing cytokinesis at the end of cell division or during the healing of a wound in the cortex of Xenopus eggs. We generalize the hydrodynamic active gel theory along the lines of thin shell theory of continuum elasticity to ...
Salbreux, G., Prost, J., Joanny, J.-F.
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Assembly Mechanism of the Contractile Ring for Cytokinesis by Fission Yeast
Science, 2008Animals and fungi assemble a contractile ring of actin filaments and the motor protein myosin to separate into individual daughter cells during cytokinesis. We used fluorescence microscopy of live fission yeast cells to observe that membrane-bound nodes containing myosin were broadly distributed around the cell equator and assembled into a contractile ...
Dimitrios, Vavylonis +4 more
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The Origin and Action of the Contractile Ring
1987In animal cells (and a few selected plant cells) cell division is concluded by formation of a cleavage furrow that constricts the entire cell, ultimately pinching it into two parts (Figure 1), Cell cleavage by constriction is one of two general strategies of cytokinesis.
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Stepping into the ring: the SIN takes on contractile ring assembly.
Genes & development, 2009The septation initiation network (SIN) regulates the timing of septum formation in Schizosaccharomyces pombe. However, whether and how the SIN functions in contractile ring formation has remained unclear. In this issue of Genes & Development, Hachet and Simanis (3205-3216) demonstrate that the SIN acts downstream from the Plo1 kinase to control a final
Rachel H, Roberts-Galbraith +1 more
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