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Digitale Medien

Adaptive energy metabolism in four chromosomal species of subterranean mole rats (1988)

Yahav, S. ; Simson, S. ; Nevo, E.

Springer

Oecologia 77 (1988), S. 533-536

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ISSN: 1432-1939

Schlagwort(e): Energetics ; Speciation ; Adaptation ; Spalax ehrenbergi

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Gross energy intake and apparent dry matter digestibility of animals fed carrots ad lib in the laboratory, were measured in the four chromosomal species of the Spalax ehrenbergi superspecies in Israel. Gross energy intake of 132.8 and 155.9 kJ/day was measured for the 2n=52 and 2n=58 chromosomal “mesic” species, while in the 2n=54 and 2n=60 chromosomal “xeric” species it measured only 80.3 and 75.0 kJ/day, respectively. Dry matter digestibility ranged between 92.3 and 95.6% in thefour chromosomal species. The differences in gross energy intake between the “mesic” and “xeric” species, appeared to reflect adaptive energy metabolism variation associated with geographic variation in climate, habitat productivity, and food availability.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00377270

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Digitale Medien

Surface analytical investigations of Al and (Ti, Al) nitrides formed by ion implantation and their corrosion properties (1994)

Simson, S. ; Heide, N. ; Schultze, J. W.

Chichester [u.a.] : Wiley-Blackwell

Surface and Interface Analysis 22 (1994), S. 431-435

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ISSN: 0142-2421

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Physik

Notizen: Nitrides of Ti, Al and TiAlx alloys were prepared by low energy ion implantation (3 keV N2+). The layer thickness was ∼ 10 nm. The nitride layers were characterized using XPS, UPS and a Kelvin probe. The insulating properties known for bulk AlN were found also for the prepared AlNimpl layers. The work functions for the alloys and the nitrides and their variation with the ion dose were determined. Peak parameters for the XP spectra deconvolution were established. Despite their thinness, the layers showed anodic stability in 0.5 M H2SO4 up to 1.3 V (SHE) for (TiAl)Nimpl and even up to 1.8 V (SHE) for AlNimpl. Above these potentials, the nitrides were oxidized to metal oxides.

Zusätzliches Material: 7 Ill.