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Digitale Medien

Production of higher alcohols, ethyl acetate, acetaldehyde and other compounds by 14Saccharomyces cerevisiae wine strains isolated from the same region (Salnés, N.W. Spain) (1992)

Longo, E. ; Velázquez, J. B. ; Sieiro, C. ; [weitere]

Springer

World journal of microbiology and biotechnology 8 (1992), S. 539-541

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ISSN: 1573-0972

Schlagwort(e): Aroma ; compound ; Saccharomyces cerevisiae ; wine

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Abstract Fourteen strains of the yeastSaccharomyces cerevisiae were isolated from three wineries in the Salnés wine region (N.W. Spain) at the three different periods of the natural fermentation. Each wild yeast was screened for production of acetaldehyde, ethyl acetate, isobutanol,n-propanol, amylic alcohol and other important enological compounds during laboratory scale fermentations of grape juice. After 25 days at 20°C, the analytical results evidenced variations in the production of acetaldehyde (from 13.1 to 24.3 mg/l), isobutanol (from 27.7 to 51.1 mg/l), amyl alcohols (from 111 to 183 mg/l) and ethyl acetate (from 19.3 to 43.7 mg/l). Although isolated from the same wine region, differences in the wine composition were observed depending on the particular yeast strain used for the vinification experiments.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01201958

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Digitale Medien

ZnO clusters models: An AM1 and MNDO study (1993)

Martins, J. B. L. ; Andrès, J. ; Longo, E.

New York, NY : Wiley-Blackwell

International Journal of Quantum Chemistry 48 (1993), S. 643-653

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ISSN: 0020-7608

Schlagwort(e): Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: AM1 and MNDO semiempirical electronic calculations have been carried out for ZnO surface ((ZnO)n, n = 11, 16, 22, 24, 33, 42, and 44) cluster models. The theoretical results can be summarized as follows: (i) the energy gap HOMO-LUMO is shown to be dependent on the cluster size and geometry optimization; however, better agreement of this gap with experimental data is obtained with cluster of limited size (n = 16, 22, and 24). (ii) The Mulliken charge of the cluster zinc ion is invariant with the optimization procedure, showing an average value of 0.52 a.u. (MNDO) and 0.62 a.u. (AM1). © 1993 John Wiley & Sons, Inc.

Zusätzliches Material: 8 Ill.