Variations in Absolute Chemical Shift of Nuclear Induction Signals of Hydroxyl Groups of Methyl and Ethyl Alcohol

Arnold, James T.; Packard, M. E.

doi:10.1063/1.1748134

Cited by 211 publications

(56 citation statements)

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“…3 1 1 shows the 1 H NMR spectrum for the 4 10 -1 mol dm -3 sample of 1-phenyl-1,3-butanedione (unsymmetrical b-dikentone) in CDCl 3 at 30 . A relatively broad signal assigned to the proton for OH (enol) is observed at 16.128 ppm; signals assigned to the protons for phenyl group exist between 7.886 and 7.257 ppm; signals of the proton at a position also exists at 6.175 ppm and signals of the protons for CH 3 , at 2.200 ppm.…”

Section: Resultsmentioning

confidence: 99%

“…The tunneling effect is significantly related to the proton transfers, which are very important for the chemical and biological aspects. Many investigations concerning proton transfers have been carried out [1][2][3][4][5] . For example, the proton transfer between two molecules of dimeric benzoic acid is so rapid that it can not be observed at room temperature: The proton transfer is able to be observed only at very low temperature 6) .…”

Section: Introductionmentioning

confidence: 99%

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Intramolecular Hydrogen Bonding (Proton Transfer) of 1-Phenyl-1,3-butanedione

Matsuzawa¹,

Nakagaki²,

Iwahashi³

2007

J. Oleo Sci.

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Through the 1 H and 13 C NMR measurements for the symmetrical b-diketones such as 2,4-pentanedione and 1,3-diphenyl-1,3-propanedione and unsymmetrical one such as 1-phenyl-1,3-butanedione at various concentrations and temperatures, we confirmed that 1-phenyl-1,3-butanedione in CDCl 3 exists as monomers in its relatively low concentration. In addition, the 1-phenyl-1,3-butanedione in CDCl 3 exists not as a keto-form but as two kinds of cis-enol forms. The proton transfer between the two kinds of cis-enols for 1-phenyl-1,3-butanedione was discussed thermodynamically; it is concluded that the OH proton of enol of 1-phenyl-1,3-butanedione is considerably located near the oxygen atom attached to the carbon atom linking to a phenyl group.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Intramolecular Hydrogen Bonding (Proton Transfer) of 1-Phenyl-1,3-butanedione

Matsuzawa¹,

Nakagaki²,

Iwahashi³

2007

J. Oleo Sci.

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“…This approach allows one to determine the magnetic moments of light nuclei (for instance 13 C, 14 N, 15 N, 17 O, 19 F, 29 Si, 31 P, 33 S, and 73 Ge) with much higher accuracy than it has been possible before. We also point out that the new magnetic moments can be used to predict successfully the shielding constant of a nucleus in a molecule when the corresponding resonance frequency is known.…”

Section: Introductionmentioning

confidence: 97%

Nuclear magnetic moments from NMR spectra—Experimental gas phase studies and nuclear shielding calculations

Jackowski

Jaszuński

2007

Concepts Magnetic Resonance

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NMR spectra of gaseous compounds and quantum chemical calculations are combined to determine new accurate values of magnetic dipole moments for a series of nuclei. We have analyzed shielding constants, resonance frequencies, and nuclear magnetic moments for a group of simple molecules. The chemical shifts and resonance frequencies are measured at 300 K and extrapolated to the zero-density limit in order to remove all the intermolecular effects from the experimental parameters. The absolute shielding constants in the studied molecules are obtained from ab initio calculations. Assuming the proton magnetic moment as the reference, we determine the nuclear magnetic moments of 13 C,

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“…O segundo estágio da glicólise inicia com a atuação da enzima gliceraldeído-fosfato-desidrogenase (GAPDH), oxidando gliceraldeído-3-fosfato (Arnold;Packard, 1951).…”

Section: Introductionunclassified

Estudo do efeito da nefropatia crônica experimental induzida pelos 5/6 de nefrectomia nas glândulas salivares de ratos

Romero¹

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AGRADECIMENTOS Agradeço a DeusA doença renal crônica (DRC) gera manifestações orais e alterações salivares nos pacientes, entretanto poucos estudos avaliaram os efeitos desta doença nas glândulas salivares. O objetivo deste trabalho foi avaliar os efeitos da nefropatia crônica experimental na morfologia, metabolismo, estresse oxidativo e concentrações iônicas nas glândulas parótida (PA) e submandibulares (SM) de ratos. A nefropatia crônica experimental foi induzida pelos 5/6 de nefrectomia (grupo DRC) e os resultados foram comparados com os grupos Sham e Controle no tempo experimental de 12 semanas. Foram avaliados os pesos corpóreos iniciais e finais, níveis séricos e urinários de ureia e creatinina, a depuração de creatinina e excreção proteica urinária. A morfologia do córtex renal foi avaliada pela contagem de glomérulos em 30 campos x200 de aumento por grupo, além disso, foram avaliadas a presença de glomeruloesclerose e fibrose intersticial no grupo DRC. Nas glândulas PA e SM, foi realizada contagem de ductos em 30 campos x400 de aumento por grupo e avaliação de fibrose e de glicogênio no parênquima glandular. A análise metabólica avaliou os efeitos da DRC e estímulos simpáticos e parassimpáticos da salivação nos fluxos metabólicos glicolítico, oxidativo e anaplerótico utilizando infusões com [U-13 C]Glicose ou [1,[6][7][8][9][10][11][12][13] C 2 ]Glicose, [2- hexoquinase [HK], fosfofrutoquinase-1(PFK-1), piruvato quinase (PK), lactato desidrogenase (LDH), glicose-6-fosfato desidrogenase (G6PD), amilase, peroxidase e catalase. Além disso, foram quantificados os conteúdos de malondialdeído [MDA], glicogênio e concentrações iônicas de cálcio, fósforo e sódio. Foram observadas diminuições significativas dos pesos corpóreos finais, aumentos significativos das concentrações séricas e diminuições das concentrações urinárias de ureia e creatinina, diminuição da depuração de creatinina e aumento da excreção proteica no grupo DRC comparado aos grupos Controle e Sham. Na avaliação do córtex renal encontramos diminuição significativa da contagem glomerular, infiltrado inflamatório, atrofia tubular, glomeruloesclerose e fibrose intersticial. Na avaliação histológica glandular foi observado aumento significativo da contagem de ductos e diminuição de glicogênio na glândula SM. Na análise metabólica observamos a prevalência Chronic kidney disease (CKD) promotes oral manifestations and salivary changes in patients, but few studies have evaluated the effects of this disease in the salivary glands. The aim of this study was to evaluate the effects of experimental chronic nephropathy in morphology, metabolism, oxidative stress and ionic concentrations in parotid (PA) and submandibular glands (SM) of rats.Experimental chronic nephropathy was induced by 5/6 nephrectomy (CKD group) and the results were compared with the Sham and Control groups at 12 weeks experimental period. The initial and final body weights, serum and urinary levels of urea and creatinine, creatinine clearance and protein excretion were evaluated. The mor...

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Variations in Absolute Chemical Shift of Nuclear Induction Signals of Hydroxyl Groups of Methyl and Ethyl Alcohol

Cited by 211 publications

References 2 publications

Intramolecular Hydrogen Bonding (Proton Transfer) of 1-Phenyl-1,3-butanedione

Intramolecular Hydrogen Bonding (Proton Transfer) of 1-Phenyl-1,3-butanedione

Nuclear magnetic moments from NMR spectra—Experimental gas phase studies and nuclear shielding calculations

Estudo do efeito da nefropatia crônica experimental induzida pelos 5/6 de nefrectomia nas glândulas salivares de ratos

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