(n.) An unlined or undyed waistcoat; a single garment; -- opposed to doublet.
Example Sentences:
(1) Quantitative singlet-singlet energy-transfer measurements were carried out to determine changes in the distance between the two Met-84 H4 sites within the same nucleosome following conformational transitions which we have reported earlier.
(2) In neutral or basic aqueous solution guanine, guanosine, deoxyguanosine, guanylic acid, deoxyguanylic acid, thymine, and uracil reacted with singlet oxygen.
(3) This broad singlet does not appear to be a tyrosyl radical.
(4) The ESR spectrum exhibited a singlet (g = 2.0021) with a 5.4-G peak-to-peak linewidth.
(5) While hydroxyl radicals produce DNA strand breaks and sites of base loss (AP sites) in high yield and react with all four bases of DNA, singlet oxygen generates predominantly modified guanine residues and few strand breaks and AP sites.
(6) These changes are detected by variations in the rate of decay of the excited singlet state of pyrene after pulsation with a 10-nsec ruby laser flash.
(7) This has been demonstrated using a separated-surface-sensitizer system for generating chemically pure singlet oxygen, eliminating most of the complications that arise with singlet oxygen generation by conventional photosensitization.
(8) Since all the sulfhydryl groups of beta-crystallin are known to be exposed on the surface of the protein (Andley et al, 1982, Biochemistry 21, 1853), these results suggest that the pronounced changes in conformation of beta-crystallin by singlet oxygen may be due to a rapid loss of the protein tertiary structure by oxidation of the sulfhydryl groups.
(9) The quantum yields for singlet oxygen formation via energy transfer from triplet alpha-terthienyl have been obtained from time-resolved measurements of its IR phosphorescence: these yields are in the 0.6-0.8 range in non-polar and polar (hydroxylic and non-hydroxylic) solvents.
(10) Attempts with various chemical sources of singlet oxygen to determine whether this species inactivates DNA did not give an unequivocal answer.
(11) The near IR emission at 1270 nm following pulsed laser excitation of methylene blue in deuterium oxide, was used to study the interaction of a singlet molecular oxygen (1O2) with (i) 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) and its oxidation products, and (ii) biosubstrates of relevance in Parkinson's disease.
(12) This differs from results obtained with native enzyme, where pterin acts as a sensitizer via efficient singlet-singlet energy transfer to FADH2.
(13) Chemiluminescence appears to result from a side reaction involving singlet oxygen attack on the alpha-methene bridge, yielding a dioxetane.
(14) In acetonitrile, diphenylamine was oxidized by singlet oxygen to form N-phenyl-p-benzoquinonimine.
(15) This information combined with the fluorescence quantum yield data account for the low values for singlet oxygen production.
(16) Other roles of carnosine, such as chelation of metal ions, quenching of singlet oxygen, and binding of hydroperoxides, are also discussed.
(17) Tests for the ability of singlet oxygen to induce lambda prophage in E. coli K12 also proved negative.
(18) The light-dependent reaction appears to be mediated by singlet oxygen.
(19) Superoxide anion (O-2) and singlet oxygen (1O2) were estimated but undetectable during the dopa-tyrosinase reaction.
(20) Evidence is presented for three mechanisms of inhibition by extendible nucleotides (of dhp and ara types) exhibiting frequent internalization: araATP acted as a simple pseudoterminator of alpha and beta polymerases, but was easily extended past singlet sites by Herpesviridae polymerases and only stalled at sites requiring two or more araATP insertions in a row.
Spin
Definition:
(v. t.) To draw out, and twist into threads, either by the hand or machinery; as, to spin wool, cotton, or flax; to spin goat's hair; to produce by drawing out and twisting a fibrous material.
(v. t.) To draw out tediously; to form by a slow process, or by degrees; to extend to a great length; -- with out; as, to spin out large volumes on a subject.
(v. t.) To protract; to spend by delays; as, to spin out the day in idleness.
(v. t.) To cause to turn round rapidly; to whirl; to twirl; as, to spin a top.
(v. t.) To form (a web, a cocoon, silk, or the like) from threads produced by the extrusion of a viscid, transparent liquid, which hardens on coming into contact with the air; -- said of the spider, the silkworm, etc.
(v. t.) To shape, as malleable sheet metal, into a hollow form, by bending or buckling it by pressing against it with a smooth hand tool or roller while the metal revolves, as in a lathe.
(v. i.) To practice spinning; to work at drawing and twisting threads; to make yarn or thread from fiber; as, the woman knows how to spin; a machine or jenny spins with great exactness.
(v. i.) To move round rapidly; to whirl; to revolve, as a top or a spindle, about its axis.
(v. i.) To stream or issue in a thread or a small current or jet; as, blood spinsfrom a vein.
(v. i.) To move swifty; as, to spin along the road in a carriage, on a bicycle, etc.
(n.) The act of spinning; as, the spin of a top; a spin a bicycle.
(n.) Velocity of rotation about some specified axis.
Example Sentences:
(1) Type 1 changes (decreased signal intensity on T1-weighted spin-echo images and increased signal intensity on T2-weighted images) were identified in 20 patients (4%) and type 2 (increased signal intensity on T1-weighted images and isointense or slightly increased signal intensity on T2-weighted images) in 77 patients (16%).
(2) Electron spin resonance studies indicate the formation of two vanadyl complexes that are 1:1 in vanadyl and deferoxamine, but have two or three bound hydroxamate groups.
(3) The relative rates of reduction of several spin-labeled molecules that partition differently across the hy-drophobic-interface of inner membranes from rat liver mitochondria were investigated.
(4) When reformist industrialist Robert Owen set about creating a new community among the workers in his New Lanark cotton-spinning mills at the turn of the nineteenth century, it was called socialism, not corporate social responsibility.
(5) An unusually high degree of motional freedom is found for both these spin-labels, even in gel phase bilayers.
(6) tert-Butyl hydroaminoxyl is detected as a degradation product of the hydroxyl adduct from all spin traps.
(7) After the first stage of analysis the spin systems of 60 of the 77 residues were assigned to the appropriate residue type, providing an ample basis for subsequent sequence-specific assignments.
(8) A method using selective saturation pulses and gated spin-echo MRI automatically corrects for this motion and thus eliminates misregistration artifact from regional function analysis.
(9) The Iranians have accused the Israelis and the US of designing and deploying Stuxnet, which set some of their centrifuges spinning out of control.
(10) Single vertical spin and electron microscopy analyses of these HDL subpopulations demonstrated that acid elution from the affinity columns caused no detectable change in size and density of the three subpopulation particles.
(11) The Soret MCD of the reduced protein is interpreted as th sum of two MCD curves: an intense, asymmetric MCD band very similar to that exhibited by deoxymyoglobin which we assign to paramagnetic high spin cytochrome a3(2+) and a weaker, more symmetric MCD contribution, which is attributed to diamagnetic low spin cytochrome a2+.
(12) For dipeptides containing the amino terminal residues glycine, alanine and phenylalanine, abstraction of the hydrogen from the carbon adjacent to the peptide nitrogen was the major process leading to the spin-adducts.
(13) A single spin density gradient ultracentrifugation method in a swinging bucket rotor has been applied for the detection and isolation of low density lipoprotein (LDL) subfractions.
(14) In addition to rapid motions, slow motions were detected by 1H spin-lattice relaxation time in the rotating frame (TH1 rho) and cross-polarization time (TCH), together with data from static spectra, indicating that the aliphatic portion of the detergent interacts more strongly with hydrophobic protein surfaces than do the polar heads.
(15) In addition, the spin lattice relaxation time of the cytoplasmic Cs resonance was approx.
(16) 220 MHz proton Fourier transform (FT) NMR with quadrature phase detection (QPD) technique is applied to observe largely hyperfine-shifted signals of various hemoproteins and hemoenzymes in ferric high-spin state.
(17) Under aerobic conditions, electron spin resonance spectroscopy showed evidence for the production of AZQ semiquinone (AZQH) and oxygen radicals.
(18) With these compounds, the spin density at the nitro group was greater than with nifurtimox, nitrofurazone and nitrofurantoin.
(19) Probing of the active site of microsomal cytochrome P-450 was carried out with a spin label derived from 2-methyl-1,2-bis(3-pyridyl)-1-propanone (metyrapone).
(20) The electronic structure of the low-spin ferric iron in cyanide complex appears to be modulated by halide binding to a protonated amino acid in the distal heme cavity.