Dendritic structures in fluids of high viscosity.
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Dendrites↗
Biomedical subjects
E Lüscher
Publications and source records attributed to E Lüscher.
Conservative patterns.
Conservative patterns dominate the pattern formation of systems governed by competition and limited resources. Using a simple mechanical model the principle of marginal stability, period doubling in space, the existence of conserved values and relations to biological pattern formation are discussed.
Mathematics↗
Thermal properties of water in myoglobin crystals and solutions at subzero temperatures.
The water of hydration in myoglobin crystals and solutions was studied at subzero temperatures by calorimetry and infrared spectroscopy (ir). For comparison we also investigated glycine, DL-alanine and DL-valine solutions. The hydration water remains amorphous at low temperatures. We find a broad glass transition between 180 and 270 K depending on the degree of hydration. The ice component shows a noncolligative melting point depression that is attributed to a finite conformational flexibility. The ir spectrum and the specific heat of water in myoglobin crystals was determined for the first time between 180 and 290 K. The glass transition in crystals is qualitatively similar to what is found in amorphous samples at the same water content. These data are compared with Mössbauer experiments and dielectric relaxation of water in myoglobin crystals. The similar temperature dependencies suggest a cross correlation between structural fluctuations and the thermal motion of crystal water. A hydrogen bond network model is proposed to explain these features. The essential ingredients are cooperativity and a distribution of hydrogen-bonded clusters.
Animals↗
[André Léon Aubin, July 16, 1887 - February 1967].
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France↗