(n.) A hydrocarbon radical, CH2, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH2Br2; -- formerly called also methene.
Example Sentences:
(1) The effect of 4,4'-methylene bis(2-chloroaniline) (MOCA), 4,4'-methylene dianiline (MDA) and 4,4'-sulphonyldianiline (Dapsone) in vivo on xenobiotic biotransformation in male rat liver was studied.
(2) It was concluded that the detachment of the oxaloyl residue from oxaloacetate and its replacement by a proton proceed with inversion of configuration at the methylene group which becomes methyl during the hydrolysis.
(3) After methylene blue, the gradient in resting potential across the circular layer was greatly reduced or abolished.
(4) Furthermore, Methylene Blue contamination of the standard stain increased the rate of error in image analysis of white blood cell nuclei due to variations of staining intensity.
(5) The purpose was to show whether or not the methylene-blue test can be postponed to the second day.
(6) Baseline evaluation revealed that 17 (32%) patients had high turnover (HTOP), and 36 (68%) normal turnover osteoporosis (NTOP) as assessed by measurement of whole body retention (WBR) of 99mTc-methylene diphosphonate.
(7) Methylenation of the delta6 double bond with dimethyloxosulfonium methylide proceeds steroselectively from the beta side of the molecule.
(8) The amount of formazan obtained after incubating vital cells with Meldola Blue as electron carrier was greater than that obtained with Methylene Blue, menadione, 2,6-dichloroindophenol, 1-methoxyphenazine methosulphate or phenazine methosulphate.
(9) The NMR spectra of the two tRNA species in the region between 0 and 4 ppm below 4,4-dimethyl-4-silapentane-1-sulfonic acid (DSS) (methyl and methylene region) were the same except for the absence of the lowest field peak at 3.8 ppm in tRNAMet f3, thus unequivocally identifying this resonance at the methyl group of m7G47 of tRNAMet f1.
(10) The effects of methylene blue on vascular tone and responses to hypoxia and acetylcholine were reversible, and responses returned to control value after the infusion was terminated.
(11) NMOP-d5, with deuterium in the N-methyl and in the alpha-methylene, gave rise only to 7-MeG containing three deuterium atoms.
(12) The beta,gamma-methylene analogue of ATP was reactive in exchange reactions with [(14)C]AMP.
(13) Inactivation is due to alkylation by 2-methylene-3(2H)-furanone, a decomposition product of the enzymic product 3'-keto-2'-deoxyuridine triphosphate.
(14) The method comprised adsorption on Extrelut column from alkaline plasma, elution with diethyl ether-methylene chloride, evaporation in the presence of 0.01 M hydrochloric acid and injection of the acid solution onto a mu Bondapak C18 column, using acetonitrile-0.025 M potassium dihydrogenphosphate as mobile phase and ultraviolet detection at 210 nm.
(15) The linear, nonbranched segments of the omega-cyclohexyl chains in 13cyPC are closely packed with the all-trans methylene zig-zag planes oriented parallel to each other.
(16) Clonidine induced a contraction when endothelium was removed or muscle was treated with methylene blue.
(17) The effects of bradykinin, but not glyceryl trinitrate, were partially restored after removing methylene blue.
(18) The kinetic behavior observed at steady-state using different concentrations of the substrates ATP and fructose-6-phosphate and the pattern of inhibition by the substrate analogs adenylyl-(beta, gamma-methylene)-diphosphonate and D-arabinose-5-phosphate are consistent with a random sequential mechanism in rapid equilibrium, rather than with an ordered binding as was suggested earlier.
(19) Replacement of the cysteinylglycyl moiety with cysteine afforded 20, which retained significant antagonist activity, while lengthening or shortening the lipid tail by five methylene groups resulted in complete loss of activity.
(20) The pro-S 4'-methylene proton of pyridoxamine phosphate is removed during the reaction, and the product is primarily L-tryptophan.
Piperonal
Definition:
(n.) A white crystalline substance obtained by oxidation of piperic acid, and regarded as a complex aldehyde.
Example Sentences:
(1) The procedure has been adapted to the analysis of other products including domestic vanilla extracts and imitation vanilla flavorings for vanillin, ethyl vanillin, 4-hydroxybenzaldehyde and piperonal.
(2) piperonylic acid, piperonyl alcohol, piperonal and vanillic acid were identified in the free form in 0-96 h urine whereas only piperic acid was detected in 0-6 h bile.
(3) 8-Butyl-8-azabicyclo[3.2.1]octan-3-one was condensed with selected tolualdehydes, methoxybenzaldehydes and chlorobenzaldehydes, as well as with piperonal, furfural, dimethylaminobenzaldehyde, 3-pyridine-carboxaldehyde and 4-pyridine-carboxaldehyde.
(4) Piperonal was used to verify the method and to show that precision and accuracy were not affected by the volatility of the cyclohexane.