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Digitale Medien

Serum levels of glucose, insulin, and C-peptide during long-term D-ribose administration in man (1991)

Gross, M. ; Zöllner, N.

Springer

Journal of molecular medicine 69 (1991), S. 31-36

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ISSN: 1432-1440

Schlagwort(e): (D-)ribose ; Glucose ; Insulin ; C-peptide

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary D-ribose was given orally and/or intravenously to nine healthy subjects at doses ranging from 83.3 to 222.2 mg/kg per hour for at least four hours. The serum ribose level increased in a dose-dependent manner to maximum concentrations of 75 to 85 mg/dl. The serum glucose level decreased after the beginning of continuous ribose administration and was reduced as long as ribose was being administered. The oral or intravenous administration of 166.7 mg/kg per hour of ribose resulted in a 25% decrease in serum glucose. Higher intravenous doses of ribose did not provoke a further decrease in serum glucose concentration. Oral administration of 166.7 mg/kg per hour led to an increase in serum insulin concentrations from a mean of 8.4 (range 6.4–11.5) to 10.4 (range 6.3–15.4) μU/ml (p〈0.05). In contrast, intravenous administration did not change serum insulin concentrations significantly. The serum c-peptide concentration remained unchanged regardless of treatment. We conclude that the variations in plasma insulin concentrations do not account for the observed decrease in mean serum glucose concentrations accompanying D-ribose administration.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01649054

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Digitale Medien

Reactions of propene and cyclopropane radical cations with neutral ethylene (1993)

Vollmer, D. L. ; Gross, M. L.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 28 (1993), S. 185-192

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ISSN: 0030-493X

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The gas-phase reactions of propene and cyclopropane radical cations with neutral ethylene were investigated by using Fourier transform, chemical ionization and tandem mass spectrometries. Both reactions form covalent C5H10 adduct ions. The adduct ions are hypothesized to form initially as distonic radical cations that isomerize via a substituted cyclopropane intermediate and are detected as the most stable C5H10 isomer, the 2-methylbut-2-ene radical cation. The rate constant for each reaction is approximately 20% of the theoretical collision rate, indicating that product ions are formed in one out of every five collisions of the C3H6 radical cations with neutral C2H4.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/oms.1210280309

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Digitale Medien

Amalgam electrodes: Direct electrochemical generation of cadmium macrocyclic complexes (1992)

Boudon, C. ; Gisselbrecht, J. P. ; Gross, M.

Weinheim : Wiley-Blackwell

Electroanalysis 4 (1992), S. 19-26

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ISSN: 1040-0397

Schlagwort(e): Amalgam electrode ; cadmium ; macrocyclic complexes ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The electrochemical oxidation of cadmium amalgam was studied in the nonaqueous solvents CH2Cl2, 1,2-C2H4Cl2 and propylene carbonate. Significant coordination effects were observed between the electrogenerated Cd(II) ions and 18-membered macromonocyclic ligands, each containing six Lewis bases heteroatoms: 18-O6, 18-S6, 18-N2O4, and 18-N6. The stoichiometries and the stabilities of the resulting complexes were determined. These stabilities increase from 18-O6 or 18-S6 to 18-N6.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/elan.1140040106

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Digitale Medien

Elimination of acetic acid from protonated 4,5-diacetoxyphenanthrene and 2,2′-diacetoxybiphenyl: An example of an ion chemistry proximity effect (1993)

Orlando, M. ; George, M. ; Gross, M. L.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 28 (1993), S. 1184-1188

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ISSN: 0030-493X

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Protonated 4,5-diacetoxyphenanthrene and 2,2′-diacetoxybiphenyl dissociate, owing to the interaction of the two acetoxy groups, by eliminating a molecule of acetic acid. This novel proximity effect, which occurs for a fast atom bombardment-produced closed-shell ion, was examined in detail using tandem mass spectrometric methods. This process, which was first observed in the decompositions of acetylated complex natural products such as stentorin and hypericin, may serve as a general process for determining the proximity of hydroxyl groups in polycyclic aromatic compounds.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/oms.1210281033

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