Search Within
Applied Filters:
Showing 1-28 of 28 results for "


" within Papers
The role of onium salts in the oxidation of hydrocarbons by O 2 catalysed by cationic phase-transfer reagents
Csanyi L, et al.
Physical Chemistry Chemical Physics, 2(17), 3801-3805 (2000)
Vladimír Král et al.
Organic & biomolecular chemistry, 2(8), 1169-1175 (2004-04-06)
A new series of cytosine-substituted metalloporphyrin conjugates (containing Co(II) and Zn(II) as the coordinated metals) were designed and investigated as nucleotide receptors in PVC-membrane-based ion-selective electrodes under neutral conditions. The potentiometric results indicate that these systems, in particular the Co(II)-containing...
S S Smith et al.
The Journal of general physiology, 114(6), 799-818 (1999-12-01)
The cystic fibrosis transmembrane conductance regulator (CFTR) Cl channel exhibits lyotropic anion selectivity. Anions that are more readily dehydrated than Cl exhibit permeability ratios (P(S)/P(Cl)) greater than unity and also bind more tightly in the channel. We compared the selectivity...
A B Packard et al.
Nuclear medicine and biology, 22(7), 887-891 (1995-10-01)
Iridium-191m is an attractive radionuclide for first-pass radionuclide angiography, but development of an 191Os/191mIr generator with high 191mIr yield has proven difficult. The use of trans-dioxobisoxalatoosmate(VI) as a parent species results in a higher initial yield (20 to 25%/mL), but...
Effect of cyclodextrins on the stability of bilayer: A novel electrophoretic approach
Zandkarimi M, et al.
Journal of Liquid Chromatography and Related Technologies, 37(17), 2433-2443 (2014)
A J Freeman et al.
Journal of pharmacological methods, 23(1), 7-11 (1990-03-01)
The patency of chronically implanted intravascular cannulae is usually limited by thrombus formation at the cannula tip. In the present experiments, methods of improving the antithrombotic properties of the cannulae have been examined using a number of different heparin-bonding treatments....
Monika Mroczkiewicz et al.
Talanta, 85(4), 2047-2052 (2011-08-30)
In this work, flow-injection system with potentiometric detection was tested for determination of total carboxylic acid concentration. Detection part of the examined system consists of ion-selective electrodes (ISEs) with polymer membranes of different compositions. First electrode is based on Zr(IV)-tetraphenylporphyrin...
Huimin Guo et al.
Talanta, 75(3), 851-855 (2008-07-01)
A novel potentiometric method for the determination of ascorbate is described in this communication. It is based on ascorbate oxidation with permanganate which is continuously released from the inner reference solution of a ligand-free tridodecylmethylammonium chloride (TDMAC)-based polymeric membrane ion...
A J Hamilton et al.
Neurosurgery, 40(5), 1043-1049 (1997-05-01)
The biotoxicity of tri-iododecyclemethyl ammonium chloride (TDMAC)-coated catheters in the brain was tested, as was the efficacy of the vancomycin-bonded, TDMAC-coated catheters to inhibit staphylococcal growth in vitro and to delay the onset of clinical manifestations of catheter-related staphylococcal ventriculitis...
Y B Kim et al.
Journal of Korean medical science, 9(5), 357-361 (1994-10-01)
Expanded polytetrafluoroethylene(ePTFE) grafts 4mm long and 1mm in diameter were implanted into the iliac artery of 100-150g male rats using standard microvascular technique. Prior to clamp removal, the cremaster muscle was isolated as an island flap based on the iliac...
H Chang et al.
Journal of the Formosan Medical Association = Taiwan yi zhi, 89(2), 79-83 (1990-02-01)
From April 1981 to December 1988, a total of 23 patients were operated upon for the repair of an aneurysm of the descending thoracic aorta with a tridodecylmethylammonium chloride (TDMAC)-heparin-impregnated shunt. There were 20 men and 3 women. The ages...
Jan Langmaier et al.
Analytical chemistry, 79(7), 2892-2900 (2007-02-24)
Chronopotentiometry and electrochemical impedance spectroscopy were used to study the transient behavior and the potentiometric response mechanism of the polymer membrane-based sensor for heparin. Membrane with a composition of 66 wt % poly(vinyl chloride), 33 wt % o-nitrophenyl octyl ether...
J H Yun et al.
ASAIO journal (American Society for Artificial Internal Organs : 1992), 40(3), M401-M405 (1994-07-01)
The development of an ion-selective electrode heparin sensor consisting of a specially formulated polymer membrane doped with tridodecylmethylammonium chloride as the heparin complexing agent was recently reported. Because of the simple nature of the membrane technology used, the authors envisioned...
Youngjea Kang et al.
Analytical chemistry, 83(10), 3957-3962 (2011-04-20)
Contamination of heparin with oversulfated chondroitin sulfate (OSCS) became a matter of grave concern in the medical field after many fatal responses to OSCS tainted heparin products occurred during the 2007-2008 period. Even though standard lab-based analytical techniques such as...
Heparin-responsive electrochemical sensor: a preliminary study.
S C Ma et al.
Analytical chemistry, 64(6), 694-697 (1992-03-15)
G D Kamal et al.
JAMA, 265(18), 2364-2368 (1991-05-08)
We report a prospective, randomized, controlled clinical trial to evaluate the efficacy of antibiotic-bonded catheters in reducing the incidence of intravascular catheter-related infections. Ninety-three central venous catheters and 85 arterial catheters were studied in the surgical intensive care unit. Study...
M D Wigod et al.
Journal of biomedical materials research, 27(8), 1057-1062 (1993-08-01)
This study tests the hypothesis that denucleating vascular graft material and binding cell adhesion molecules increases endothelial attachment. Removal of gas nuclei (denucleation) increases the available surface area of biomaterials for modification and/or cell adhesion, while adhesion molecules provide specific...
11-Tungstocobalto(II)phosphate as a useful standard for anionic colloid titration.
Y Tajima
Journal of biochemical and biophysical methods, 38(3), 217-223 (1999-04-01)
Natalia Abramova et al.
Talanta, 81(4-5), 1750-1754 (2010-05-06)
The influence of CO(2) and acetic acid on the response of ISFET sensors with PVC and photocured polyurethane polymer membranes with valinomycin as an ionophore was assessed. Experimental results show that the presence of these compounds has no effect on...
R S Greco et al.
Annals of vascular surgery, 9(2), 140-145 (1995-03-01)
To test the thrombosis resistance of a vascular prosthesis coated with antithrombogenic agents, we evaluated a small vessel prosthesis of expanded polytetrafluoroethylene (ePTFE) implanted in the rat aorta and removed 1 week following surgery. Control grafts consisted of 1 mm...
Preparation and application of a new glucose sensor based on iodide ion selective electrode
K Sukru, et al.
Talanta, 65(1), 87-91 (2005)
Lin Wang et al.
Analytical chemistry, 80(24), 9845-9847 (2008-11-15)
A very simple and inexpensive method to detect oversulfated chondroitin sulfate (OSCS) or other high-charge density polyanionic structures as contaminants in heparin products using potentiometric polyanion sensors is described. In the potentiometric measurement, a greater change in the phase boundary...
Andrew Yu et al.
Analytica chimica acta, 686(1-2), 76-80 (2011-01-18)
The development of a polymer membrane-based electrode to measure the anionic drug suramin in buffered saline and biological samples is described. A large non-equilibrium, steady state EMF response is observed toward suramin, and judicious choice of the polymer membrane components...
B F Farber et al.
Journal of biomedical materials research, 27(5), 599-602 (1993-05-01)
During the pathogenesis of catheter-related urinary tract infection, bacteria attach to the catheter and migrate along a biofilm into the bladder. We studied the effect of coating silastic catheters with salicylic acid on bacterial and yeast adherence. An agar roll...
V C Yang et al.
ASAIO journal (American Society for Artificial Internal Organs : 1992), 39(3), M195-M201 (1993-07-01)
Heparin is one of the most important clinical drugs, and is employed universally during surgical procedures and extra-corporeal therapies to prevent blood from clotting. Its clinical use, however, is often associated with serious hemorrhagic complications. Because of this life threatening...
Adam Malon et al.
Analytical chemistry, 75(15), 3865-3871 (2003-10-24)
The lower detection limit and the selectivity behavior of anion-selective electrodes (ISEs) are improved by using optimized inner solutions and membrane compositions. With a membrane based on the recently described ionophore [9]mercuracarborand-3, a detection limit of 2 x 10(-9) M...
Michael J O'Donnell et al.
The Journal of experimental biology, 208(Pt 1), 93-104 (2004-12-17)
Transport of the organic anion salicylate by the Malpighian tubules and gut of larval and adult fruit flies was studied using two salicylate-selective microelectrode methods. The first method combined the high selectivity of tridodecylmethylammonium-based electrodes for salicylate with the self-referencing...
H Pärsson et al.
Cardiovascular surgery (London, England), 2(2), 242-248 (1994-04-01)
The healing characteristics of polymer-coated Dacron grafts with or without heparin-bonding and collagen-coated Dacron grafts are compared with standard knitted Dacron grafts by implanting eight of each graft into pig iliac arteries. The grafts were implanted at random bilaterally with...