(n.) A thin layer or fold of tissue, usually supported by a fibrous network, serving to cover or line some part or organ, and often secreting or absorbing certain fluids.
Example Sentences:
(1) Tryptic digestion of the membranes caused complete disappearance of the binding activity, but heat-treatment for 5 min at 70 degrees C caused only 40% loss of activity.
(2) The extents of phospholipid hydrolysis were relatively low in brain homogenates, synaptic plasma membranes and heart ventricular muscle.
(3) The patterns observed were: clusters of granules related to the cell membrane; positive staining localized to portions of the cell membrane, and, less commonly, the whole cell circumference.
(4) Activity of Na,K-ATPase activity was measured as a functional marker for synaptosomal membranes.
(5) The influence of the various concepts for the induction of lateral structure formation in lipid membranes on integral functional units like ionophores is demonstrated by analysing the single channel current fluctuations of gramicidin in bimolecular lipid membranes.
(6) Phospholipid methylation in human EGMs is distinctly different from that in rat EGMs (Hirata and Axelrod 1980) in that the human activity is not Mg++-dependent, and apparent methyltransferase I activity is located in the external membrane surface.
(7) The predicted non-Lorentzian line shapes and widths were found to be in good agreement with experimental results, indicating that the local orientational order (called "packing" by many workers) in the bilayers of small vesicles and in multilamellar membranes is substantially the same.
(8) Apparently, the irradiation with visible light of a low intensity creates an additional proton gradient and thus stimulates a new replication and division cycle in the population of cells whose membranes do not have delta pH necessary for the initiation of these processes.
(9) Using monoclonal antibodies directed against the plasma membrane of Madin-Darby canine kidney (MDCK) cells, we demonstrated previously that a glycoprotein with an Mr = 23,000 (gp23) had a non-polarized cell surface distribution and was observed on both the apical and basolateral membranes (Ojakian, G. K., Romain, R. E., and Herz, R. E. (1987) Am.
(10) The fraction of the viral dose which became cell associated was independent of the incubation temperature and increased with increasing target membrane concentration.
(11) Together these results suggest that IVC may operate as a selective activator of calpain both in the cytosol and at the membrane level; in the latter case in synergism with the activation induced by association of the proteinase to the cell membrane.
(12) The Cole-Moore effect, which was found here only under a specific set of conditions, thus may be a special case rather than the general property of the membrane.
(13) We have examined the insertion of bovine 17 alpha-hydroxylase (P45017 alpha) into the endoplasmic reticulum of COS 1 cells to evaluate the functional role of its hydrophobic amino-terminal sequence and membrane insertion.
(14) The transport of potassium ions through membranes of red blood cells was examined in in bitro experiments using a CMF of 4500 oersted.
(15) These membrane perturbation effects not observed with bleomycin-iron in the presence of a hydroxyl radical scavenger, dimethyl thiourea, or a chelating agent, desferrioxamine, were correlated with the ability of the complex to generate highly reactive oxygen species.
(16) Extensive studies during recent years have shown that the interaction between hormone and membrane-bound receptor can affect the receptor characteristics in at least two ways.
(17) Membranes of this material were filled with islets of Langerhans and implanted in the peritoneal cavity of rats.
(18) The penicillin-resistant Enterococcus hirae R40 has a typical profile of membrane-bound penicillin-binding proteins (PBPs) except that the 71 kDa PBP5 of low penicillin affinity represents about 50% of all the PBPs present.
(19) To investigate the mechanism of enhanced responsiveness of cholesterol-enriched human platelets, we compared stimulation by surface-membrane-receptor (thrombin) and post-receptor (AlF4-) G-protein-directed pathways.
(20) Moreover, in DCVC-treated cells the mitochondria could not be stained with rhodamine-123, indicating severe mitochondrial damage and loss of membrane potential.
Mucocele
Definition:
(n.) An enlargement or protrusion of the mucous membrane of the lachrymal passages, or dropsy of the lachrymal sac, dependent upon catarrhal inflammation of the latter.
Example Sentences:
(1) Two patients with sphenoethmoid mucoceles developed visual field defects consistent with optic chiasm dysfunction.
(2) The authors describe a rare case of mucocele of maxillary sinus and, on the basis of the histological and namely of the ultrastructural findings, they maintain that the mucocele has in all probability a multiple pathogenesis being dependent not only on the inflammatory processes, but also on other local predisposing factors and namely the active participation of the mucosa in the formation of the cavity of mucocele.
(3) In summary, we report a case of secondary infertility attributed to pseudomyxoma peritonei caused by ruptured appendiceal mucocele.
(4) We reviewed 70 patients with lower lip mucoceles for patient characteristics, clinical features, and histopathologic findings.
(5) One type of antral mucocele, commonly seen in Japan, is referred to as a postoperative maxillary cyst and is identical to the surgical ciliated cyst of the maxilla originally reported by Gregory and Shafer.
(6) Myxoglobulosis is a rare morphologic variant of appendiceal mucocele characterized by intraluminal mucinous globules of the appendix.
(7) To elucidate the role of inflammation, mucocele fragments and fibroblasts cultured from them were examined in vitro to assess prostaglandin E2 synthesis.
(8) A craniotomy followed by a bilateral external ethmoidectomy was necessary for complete extirpation of the infected mucoceles.
(9) To our knowledge, this study describes the first case of multiple intracranial mucoceles secondary to E rostratum.
(10) Epithelial-lined sialocysts of the minor oral salivary glands are rare when compared with the common mucous retention phenomenon or mucocele.
(11) No correlation between a particular pathological condition of the gallbladder (acute cholecystitis, mucocele, chronic cholecystitis, cholesterolosis) and staining pattern or intensity of staining was found for any of the apolipoproteins, although both apolipoproteins AI and AII stained more intensely than apolipoprotein B in each group.
(12) Bone was thicker on the mucocele side than on the control side.
(13) Four patients with laryngeal mucocele (fluid-filled laryngocele) are described.
(14) Seven examples of mucocele of the sphenoid sinus have been described.
(15) A 47-year-old right-handed woman suffered an accidental dural perforation in the course of intranasal drainage of a right-sided sphenoid mucocele.
(16) Floating cells also gave positive CEA staining, whereas epithelial fragments and connective tissue in the mucocele wall were lacking in CEA.
(17) Mucoceles form if the nasofrontal duct is obstructed, if mucosa is inadequately removed during obliteration and, in some instances, where islands of mucosa are isolated by mucosal laceration.
(18) The authors document two cases of mucocele-like tumors to illustrate the difficulty in separating these lesions from colloid carcinoma on the basis of fine-needle aspiration biopsy.
(19) The treatment of mucoceles by the Lynch-Howarth frontoethmoidectomy has been criticized because of a high rate of recurrence and postoperative complications.
(20) We have presented a rare case of bilateral posterior sphenoethmoidal sinus mucoceles with bilateral compressive optic neuropathy.