What's the difference between cation and selenonium?

Cation


Definition:

  • (n.) An electro-positive substance, which in electro-decomposition is evolved at the cathode; -- opposed to anion.

Example Sentences:

  • (1) The actions of the polyvalent cationic dye Ruthenium Red and the enzyme neuraminidase were studied at the frog neuromuscular junction.
  • (2) Interaction of viable macrophages with cationic particles at 37 degrees C resulted in their "internalization" within vesicles and coated pits and a closer apposition between many segments of plasmalemma than with neutral or anionic substances.
  • (3) On the other hand, the hydrophilic reagents, 1-ethyl-3-[3-(dimethylamino)-propyl]carbodiimide and N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline, did not affect organic cation transport.
  • (4) Kup is a separate K+ uptake system with relatively little discrimination in the transport of the cations K+, Rb+, and Cs+.
  • (5) To selectively stain polyanionic macromolecules of growth plate cartilage and to prevent artifacts induced by aqueous fixation, proximal tibial growth plates were excised from rats, slam-frozen, and freeze-substituted in 100% methanol containing the cationic dye Alcian blue.
  • (6) In general, enzyme activity was strongly reduced by heavy metal inorganic cations; less strongly by organometallic cations, some anions, and certain pesticides; and weakly inhibited by light metal cations and organometallic and organic compounds.
  • (7) Conflicting reports exist on the postprandial response of serum cationic trypsin like immunoreactivity (SCTLI).
  • (8) Frequent measurement of serum cation and appropriate replacement are recommended when high dose Cisplatin containing regimen is used in chemotherapy of neoplasms.
  • (9) Binding is inhibited by divalent and trivalent cations (Cd2+ and La3+ being most potent) and other calcium channel drugs (1,4 dihydropyridines, phenylalkylamines, benzothiazepines).
  • (10) The planar 7H-pyridocarbazole cations form stacks approximately parallel to b. Interactions between stacks occur by weak van der Waals forces.
  • (11) Bio-Rex 70, a carboxylic acid cation exchanger, is studied as a biological ion-exchanger resin model for cellular cytoplasm.
  • (12) 45Calcium has been used to compare the kinetics for the transport and bioaccumulation of this regulatory cation in keratinocyte cultures of a kindred with HPS (i.e., one HPS homozygote, one HPS obligate heterozygote, one normal family member, and healthy adult controls).
  • (13) Although GTP most potently inhibited [125I]beta h-endorphin binding in the presence of sodium, inhibition of [125I]beta h-endorphin binding by GTP was also observed in the presence of the monovalent cations lithium and potassium, but not the divalent cations magnesium, calcium, or manganese.
  • (14) The fungicidal activity of six rabbit neutrophil cationic peptides (NP) against resting (dormant) spores, preincubated (swollen) spores, and hyphae of Aspergillus fumigatus and Rhizopus oryzae was examined.
  • (15) No significant relationship was found between these urinary cations and blood pressure.
  • (16) Cation concentrations were determined in a stratified subsample (n = 89) of the study group.
  • (17) The cation leak identified in this manner is not prelytic, and it is fully reversible.
  • (18) Na+ could not be replaced for growth by any other cations or substances.
  • (19) When the concentration of Ca2+ in the medium was raised to 10 mM was the only extracellular divalent cation present, the depolarization in response to A23187 was increased to 11-8 mV.
  • (20) Mn2+ had dual effects, stimulating the ECP release in the absence of Mg2+ and Ca2+, and inhibiting the release in the presence of these cations.

Selenonium


Definition:

  • (n.) A hypothetical radical of selenium, analogous to sulphonium.

Example Sentences:

  • (1) Trimethyl-selenonium was the major form (61%) of selenium in urine.
  • (2) At 30 microM concentration, the charged sulfonium and selenonium salts possessed significant agonist activity while the corresponding neutral species were inactive, suggesting that a charged species is optimal for dopamine agonist activity.
  • (3) The novel choline analogs selenonium choline (SeCh) and acetylselenonium choline (ASeCh) have been examined for selected biological activities.
  • (4) The use of single-column ion chromatography with conductometric detection was shown to be useful for the analysis of sulfonium and selenonium ions.
  • (5) Complete separation of the trimethylselenonium ion from four other selenonium compounds was achieved, and good recovery of the compounds was obtained for the desalting and chromatographic procedures.
  • (6) Selenobetaine (SB) and selenobetaine methyl ester (SBME) are methylated selenonium derivatives that undergo metabolism to release methyl selenide and dimethylselenide, respectively, as primary metabolites.
  • (7) In a series of para-substituted aryl 2-chloroethyl selenides, a linear free energy relationship between the first-order rate constant, k'nbp and sigma p gave a rho value of -1.3, indicating that formation of a cyclic ethylene selenonium ion is the rate-controlling step for alkylation of 4-(4-nitrobenzyl)pyridine (NBP).

Words possibly related to "selenonium"