(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.
Unstable
Definition:
(a.) Not stable; not firm, fixed, or constant; subject to change or overthrow.
Example Sentences:
(1) Unstable subcapital fractures and dislocation fractures of the humerus can usually be set by closed reduction.
(2) Measurements of mechanical stability of Hb Santa Ana showed that the oxy-form of this hemoglobin was 10 times more unstable than that of Hb S and 100 times more unstable than that of Hb A.
(3) Although operative mortality was significantly greater for women during most of this review period, mortality was similar during 1983 (2.6% for men versus 2.4% for women), in spite of a significantly higher incidence of unstable angina in the female group (54% for women versus 35% for men).
(4) Similar, but less marked changes were seen in the patients unstable angina.
(5) If a tear is found, remove all unstable meniscal fragments, leaving a rim, if possible, especially adjacent to the popliteus recess, and then proceed to open cystectomy.
(6) After the impact … I lost my balance, making my body unstable and falling on top of my opponent,” he said in his submission to the panel, which met on Wednesday, a day after Uruguay had beaten Italy 1-0 in a decisive group-stage match.
(7) The complex was found to be unstable toward low values of pH and ionic strength, concentrations of urea exceeding 1 M, modifications of the cysteine residues, and fragmention in which the C terminal portions of either H3 or H4 are removed.
(8) Then, the males with super-unstable oc-mutations were crossed with females with attached X chromosomes, supporting P-M hybrid dysgenesis.
(9) Since transcription does not take place during mitosis, the amount of protooncogene products is rapidly decreased (they are extremely unstable).
(10) We describe herein, a new unstable mutant of the vestigial locus, isolated from a French natural population.
(11) The Saudi-led war in Yemen launched in March – against Houthi rebels who the Saudis insist are backed by Iran – has diverted resources and underlined the priority being given to the Gulf’s unstable and impoverished backyard.
(12) The hypothesis that opiate agonism requires an N substituent in the axial position does not appear to be consistent with the increased potency of beta isomers in which axial N substituents are thermodynamically more unstable.
(13) These drugs are beneficial also in prevention of recurrent myocardial infarction, especially among patients with unstable angina.
(14) HPLC is of particular value in providing a means of separating unstable compounds prior to assay by relatively nonspecific quantitation methods.
(15) In a cohort of 417 patients admitted consecutively to the Coronary Care Unit for acute myocardial ischemia (unstable angina pectoris in 121, acute myocardial infarction in 296 patients) 21 cases of non arrhythmogenic sudden death occurred within 24 hours after admission.
(16) The homdr mutation is unstable and probably deleterious to the cell.
(17) It is likely that the light chains assemble normally with the HMM fragment in HMM cells, while in cells lacking myosin heavy chain (mhcA) the light chains are unstable.
(18) These findings emphasize the difficulty of identifying patients at low risk for myocardial infarction or unstable angina in the emergency room without consideration of many factors from the history, the physical examination, and the ECG.
(19) During unstable detrusor contractions, which even in these healthy women are observed during bladder filling and also during inhibited voidings through the urethra, the contraction is weaker.
(20) With these scores we expect to facilitate the diagnostic screening, to indicate the way of therapy and to avoid unnecessary surgery for urinary incontinence in cases of motor-urge-incontinence (detrusor instability, unstable bladder), as long as a urodynamic examination is not feasible on every incontinent women.