(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.
Stoma
Definition:
(n.) One of the minute apertures between the cells in many serous membranes.
(n.) The minute breathing pores of leaves or other organs opening into the intercellular spaces, and usually bordered by two contractile cells.
(n.) The line of dehiscence of the sporangium of a fern. It is usually marked by two transversely elongated cells. See Illust. of Sporangium.
(n.) A stigma. See Stigma, n., 6 (a) & (b).
Example Sentences:
(1) Follow-up studies up to 2 years postoperatively revealed satisfactorally functioning stomas in all of the patients.
(2) This surgical procedure involves removing the penile urethra and creating a permanent stoma between the skin and pelvic urethra.
(3) Both types of stoma were demonstrated objectively to defunction the distal bowel almost completely.
(4) Emergency stoma formation seems to be associated with the highest complication rates, probably because of suboptimal stoma placement.
(5) Acceptance of the stoma by family and friends was good and there were no major difficulties in practising sports and other hobbies.
(6) A universal ventilation laser fiberoptic tracheoscope has been developed for use in endoscopic treatment of patients with obstructing benign and malignant lesions of the subglottis-cervicotrachea and laryngectomy tracheal stoma.
(7) The method has been developed by the authors in view of the prevalence of strictures involving the terminal ureter and the stoma after unintubated cutaneous ureterostomy in case of a normal ureteral lumen.
(8) In both groups the patients developed post-operative pharyngo-cutaneous fistulae in approximately one third of the cases, and we found no obvious difference in the stoma's ability to shrink in the two groups.
(9) The procedure offers a choice of locations of the reservoir and stoma in most patients.
(10) Patients 60 years of age or older tolerate ileostomy well, but care of the stoma can cause problems.
(11) No patients with small bowel localization required a permanent stoma.
(12) The late complication in 3 cases was urinary incontinence of the efferent nipple valve with difficulty in catheterization of the stoma.
(13) In GPL mechanical fractures such as pouch volume and stoma size are of great importance, which is in accordance with earlier theories.
(14) A tapered distal ileal segment with a catheterizable abdominal stoma provided full continence in all 10 patients.
(15) Patients initially presenting with rectal involvement or perianal fistulas were prone to need a stoma during the course of their disease while intraabdominal fistulas, abscesses, age, sex, and longstanding disease where of no prognostic significance.
(16) Although only positive metabolic changes have been registered, we feel that gastroplasty, which is not without early postoperative complications and has a failure rate of about 30%, cannot be generally recommended until the problem of postoperative dilation of the stoma has been successfully solved.
(17) Diversion with a continent caecal reservoir was associated with fewer stoma-related problems and seemed to allow the patients greater freedom to continue activities such as sport, travel and social life.
(18) But the insertion of silicone T tube through the laryngeal stoma provided a satisfactory result for airway problem.
(19) Nipple stomas of at least 2 cm height were found to resist back-flow into the conduit better than any flat stoma.
(20) Between January 1, 1982 and June 30, 1987 a total of 122 patients suffering colorectal cancer (n = 88) or diverticulitis of the colon (n = 24) underwent surgery for construction of a transient defunctioning stoma.