ZIB

Digitale Medien

Resource partitioning between shrubs and grasses in the Patagonian steppe (1989)

Sala, O. E. ; Golluscio, R. A. ; Lauenroth, W. K. ; [weitere]

Springer

Oecologia 81 (1989), S. 501-505

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ISSN: 1432-1939

Schlagwort(e): Resource partitioning ; Steppe ; Water use ; Shrubs ; Patagonia

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Experiments were conducted in the Patagonian steppe in southern South America to test the following hypotheses: (a) grasses take up most of the water from the upper layers of the soil and utilize frequent and short-duration pulses of water availability; (b) shrubs, on the contrary, take up most of the water from the lower layers of the soil and utilize infrequent and long-duration pulses of water availability. Grasses and shrubs were removed selectively and the performance of plants and the availability of soil resources were monitored. Results supported the overall hypothesis that grasses and shrubs in the Patagonian steppe use mainly different resources. Removal of shrubs did not alter grass production but removal of grasses resulted in a small increase in shrub production which was mediated by an increase in deep soil water and in shrub leaf water potential. The efficiency of utilization of resources freed by grass removal was approximately 25%. Shrubs used water exclusively from lower soil layers. Grasses took up most of the water from upper layers but they were also capable of absorbing water from deep layers. This pattern of water partitioning along with the lack of response in leaf nitrogen to the removal treatments suggested that shrubs may be at a disadvantage to grasses with respect to nutrient capture and led to questions about the role of nutrient recirculation, leaching, and nitrogen fixation in the steppe.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00378959

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Digitale Medien

Vibrational and electronic properties of tris(8-hydroxyquinolinato)vanadium (III) (1989)

Jubert, A. H. ; Baró, A. C. González ; Baran, E. J. ; [weitere]

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 20 (1989), S. 555-560

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ISSN: 0377-0486

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: A study of the electronic, infrared, Raman and pre-resonace Raman spectra of the solid complex tris(8-hydroxyquinolinato)vanadium(III) was performed. The excitation profiles of the vibrational modes that show preresonance on excitation with laser lines within the electronic bands in the visible region are reported and, on this basis and molecular orbital calculations, several vibrational and electronic absorption bands were assigned.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jrs.1250200902

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Digitale Medien

Raman resonance excitation profile of the μ-oxobis[pentacyanomanganate (III)] ion (1987)

Jubert, A. H. ; Varetti, E. L. ; Nakamoto, K. ; [weitere]

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 18 (1987), S. 577-579

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ISSN: 0377-0486

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The resonance Raman spectra of potassium μ-oxobis[pentacyanomanganate(III)] cyanide, K7[Mn2O(CN)10]CN, were measured using exciting lines at 356.4, 406.7, 530.9, 568.2, 603.5, 647.1 and 676.4 nm. By combining these data with those obtained previously (excitations at 457.9, 476.5, 488.0, 496.5, 514.5 and 608.6 nm), the excitation profiles were plotted for three totally symmetric vibrations at 1880 (CNax strech), 527 (MnCax stretch) and 259 cm-1 (MnOMn stretch). It was found that the equation derived by Mingardi et al. can adequately express these excitation profiles and that the previous assignment of the electronic transition at 509 nm needs revision.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jrs.1250180808

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Digitale Medien

Surface-enhanced Raman scattering of the redox pair CO(sep)3+/Co(sep)2+ on silver and copper electrodes (1989)

Bertolino, J. R. ; Temperini, M. L. A. ; Sala, O.

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 20 (1989), S. 725-728

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ISSN: 0377-0486

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The surface-enhanced Raman spectra of the redox pair Co(sep)3+/Co(sep)2+ (sep: sepulchrate) adsorbed on silver and copper electrodes have been obtained in the skeletal region for these compounds and the results were consistent with the redox potential of the species. The role of the anions and cations of the support electrolytes in the adsorption of the Co(sep)3+ on a silver electrode suggests that the compound is adsorbed on the electrode via ion pair formation with the anion specifically adsorbed. From the behaviour of the Raman intensity of the CH2 symmetrical stretching vibration it was possible to estimate the pKa of the Co(sep)2+.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jrs.1250201104

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Digitale Medien

Resonance Raman spectrum of the [Cu(HIO6)2]5- anion (1987)

Jubert, A. H. ; Baran, E. J. ; Diez, A. L. ; [weitere]

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 18 (1987), S. 23-24

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ISSN: 0377-0486

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The resonance Raman effect in solid Na5[Cu(HIO6)2].16H2O at room temperature was investigated and the experimental excitation profiles were obtained. From the analysis of the overtone progression of the ν1(A1g) mode, corresponding to the I—O symmetric stretching vibration, the X11 anharmonicity constant was determined. The dependence of the Raman intensities on the scattered frequency is briefly discussed.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jrs.1250180106

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