(n.) A carbonate in which but half the hydrogen of the acid is replaced by a positive element or radical, thus making the proportion of the acid to the positive or basic portion twice what it is in the normal carbonates; an acid carbonate; -- sometimes called supercarbonate.
Example Sentences:
(1) To examine the central nervous system regulation of duodenal bicarbonate secretion, an animal model was developed that allowed cerebroventricular and intravenous injections as well as collection of duodenal perfusates in awake, freely moving rats.
(2) In addition to esophageal manometry, we also performed acid-clearance studies and examined salivary output, acid-neutralizing capacity, and bicarbonate concentration.
(3) Finally, it could be observed that elevated osmotic pressures reduced the lysis of isolated secretory granules when bicarbonate ions were present in the incubation medium.
(4) In vitro studies in cardiac Purkinje fibers suggested that reversal of amitriptyline-induced cardiac membrane effects by sodium bicarbonate may be attributed not only to alkalinization but also to increased in extracellular sodium concentration, diminishing the local anesthetic action of amitriptyline and resulting in less sodium channel block.
(5) In conclusion, the ability of distal tubules to establish a significant pH gradient will contribute to the titration of non bicarbonate buffers, i.e., to titratable acid formation.
(6) Increasing the pH of local anesthetics with sodium bicarbonate has been reported to hasten their onset of action.
(7) Rings of isolated coronary and femoral arteries (without endothelium) were suspended for isometric tension recording in organ chambers filled with modified Krebs-Ringer bicarbonate solution.
(8) The addition of sodium bicarbonate to gum containing sorbitol markedly enhanced its capacity to cause and maintain an elevation of interproximal plaque pH previously lowered by exposure to fermentable carbohydrate.
(9) Por the treatment of L.A., adjunction of dialysis and furosemide improved the efficacy of early and massive sodium bicarbonate infusion.
(10) The relationship between urine pH, modified by the oral administration of either ammonium chloride or sodium bicarbonate, and the urinary excretion of prostaglandin E (PGE) was studied in healthy female subjects.
(11) It is suggested that the limited renal capacity to reabsorb sodium may account for the low bicarbonate threshold in premature infants.
(12) The most substantial deviations between actual and theoretical osmolarity values occurred with the calcium chloride, sodium bicarbonate, potassium chloride and dextrose solutions.
(13) Outward Na+ cotransport fluxes significantly rose (p less than 0.05) after acetate hemodialysis and decreased (p less than 0.05) after bicarbonate hemodialysis.
(14) The results demonstrate that: (1) the administration of somatostatin at a low dose level does not affect human exocrine pancreatic secretion, at least under the experimental conditions of this study; and (2) the administration of larger doses of somatostatin inhibits pancreatic secretion of both protein and bicarbonate dose-dependently.
(15) It is suggested from these in vivo studies that renal carbonic anhydrase is present and active during fetal life and does not limit the capacity of the fetal kidney to reabsorb bicarbonate.
(16) These data demonstrate that PTH induces bicarbonate and phosphate excretion regardless of whether carbonic anhydrase is intact or nearly 100% inhibited by acetazolamide.
(17) We therefore investigated the influence of different carbon dioxide tensions and bicarbonate concentrations on directly measured pH of organ baths aerated with mass-spectrometric analyzed O2-CO2 gases.
(18) Bicarbonate administration by either route resulted in an elevated mixed venous partial pressure of carbon dioxide and an elevated arterial pH, but no significant change in the arterial partial pressure of carbon dioxide.
(19) More recently, attention has also been focussed on bicarbonate transport in attempts to identify a possible role for this ion in enhancing the rate of net fluid efflux by proximal tubules.
(20) VO2+ is more effective than Mg2+ in activation of the bicarbonate-dependent ATPase reaction of pyruvate kinase, and in the enzyme-catalyzed hydrolysis of phosphoenolpyruvate.
Univalent
Definition:
(a.) Having a valence of one; capable of combining with, or of being substituted for, one atom of hydrogen; monovalent; -- said of certain atoms and radicals.
Example Sentences:
(1) Experiments indicated that complement deposition altered functionally bivalent IgG3 antibody in the immune complex into a univalent one.
(2) Equilibrium measurements of interactions of anti-DNP antibodies, prepared using DNP-PLL and several DNP-proteins for immunization, with DNP(0.6)-PLL(240) and with the univalent hapten, epsilon-DNP-L-lysine, were made utilizing the technique of fluorescence quenching.
(3) Explicit expressions are derived which describe the binding of a univalent ligand to equivalent and independent sites on each state of an acceptor undergoing indefinite self-association that is governed by an isodesmic equilibrium constant KI.
(4) A computer model was constructed which can generate all of the common univalent behaviours.
(5) In these male cells there was no decrease of chiasmata or increase of autosomal univalents with age, and there were some interstrain differences.
(6) Two homogeneous univalent hapten-protein conjugates, prepared by the covalent attachment of a single 2,4-dinitrophenyl (DNP-) or 2,4,6-trinitrophenyl (TNP-) side chain to the cysteine-SH in the active site of the enzyme papain, have been found to exhibit large Cotton effects in the wavelength region of the absorption bands of the DNP or TNP groups.
(7) Equivalent concentrations of binding sites of the bivalent F(ab)2 and univalent Fab fragments of anti-CEA were identical to the immunoglobulin G fraction in the standard inhibition curve.
(8) At a hydrophobic surface, molecules move apart and local water becomes strongly bonded, inert, and viscous and accumulates large cations, univalent anions, and compatible solutes.
(9) Of particular interest in that regard is the observation that the traditional logit-log analyses yield linear plots with the predicted slope of unity even though antigen univalence is an implicit assumption in their application.
(10) (3) The two stable states of the nerve membrane, which are readily demonstrable in TEA-treated or internally perfused squid giant axons, are shown to represent bivalent cation-rich and univalent cation-rich states of the nerve membrane.
(11) Only benzaldehyde dehydrogenase I is activated by K(+) and certain other univalent cations.
(12) Male meiosis in Mesostoma ehrenbergii ehrenbergii (2x = 10) is characterized by extreme restriction of chiasma formation; 3 pairs of chromosomes form bivalents at metaphase I which are associated by single very distally localized chiasma, while two pairs of chromosomes remain as unpaired univalents.
(13) Human red blood cells (RBCs) that are deficient in an integral membrane-associated protein ("stomatin") of apparent molecular mass 31 Kd show a catastrophic increase in passive membrane permeability to the univalent cations Na+ and K+ and are stomatocytic in shape.
(14) We demonstrate that shifts of the conductance-voltage (g-V) characteristic of PG films produced by changes of univalent or divalent cation concentrations result from changes of the membrane surface potential on one or both sides.
(15) The electrical resistances and rates of self-exchange of univalent critical ions across several types of collodion matrix membranes of high ionic selectivity were studied over a wide range of conditions.
(16) The steady-state solutions (Kirchhoff-Hill theorem) yield expressions for the relationship between the small signal conductance of univalent ions and the concentration of these ions in the external bathing medium (a saturation curve) and for the ionic currents and the steady-state current-voltage curve (N-shaped).
(17) The incidence of oocytes with univalents in the slides made by Tarkowski's method was much higher than in those made by ours in both age and strain groups (P less than 0.05-0.001).
(18) Our findings support the assumption that the altered activity of the Na-K-ATPase (modified by the presence of Ca-2+) is responsible for the univalent cation activation of the CaATPase.
(19) Under the conditions used univalent cations (Na(+),K(+) and Li(+)) inhibited the binding.
(20) The k-absorption edge spectrum of LyCuLP was consistent with the coordination of univalent copper.