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Your search keyword '"Elices M"' showing total 415 results
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415 results on '"Elices M"'

4. Identification and dynamics of polyglycine II nanocrystals in Argiope trifasciata flagelliform silk.

Author

Perea, GB, Riekel, C, Guinea, GV, Madurga, R, Daza, R, Burghammer, M, Hayashi, C, Elices, M, Plaza, GR, and Pérez-Rigueiro, J

Subjects
Animals, Spiders, Silk, Peptides, Proteins, Microscopy, Atomic Force, Amino Acid Motifs, Hydrogen Bonding, Nanoparticles, Microscopy, Atomic Force
Abstract

Spider silks combine a significant number of desirable characteristics in one material, including large tensile strength and strain at breaking, biocompatibility, and the possibility of tailoring their properties. Major ampullate gland silk (MAS) is the most studied silk and their properties are explained by a double lattice of hydrogen bonds and elastomeric protein chains linked to polyalanine β-nanocrystals. However, many basic details regarding the relationship between composition, microstructure and properties in silks are still lacking. Here we show that this relationship can be traced in flagelliform silk (Flag) spun by Argiope trifasciata spiders after identifying a phase consisting of polyglycine II nanocrystals. The presence of this phase is consistent with the dominant presence of the -GGX- and -GPG- motifs in its sequence. In contrast to the passive role assigned to polyalanine nanocrystals in MAS, polyglycine II nanocrystals can undergo growing/collapse processes that contribute to increase toughness and justify the ability of Flag to supercontract.

Published
2013

30. Thermomechanical behavior of human carotid arteries in the passive state

Author

Guinea, G.V., Atienza, J.M., Elices, M., Aragoncillo, P., and Hayashi, K.

Subjects
Carotid artery -- Research, Carotid artery -- Physiological aspects, Biological sciences
Abstract

Localized heating or cooling is expanding the clinical procedures used to treat cardiovascular diseases. Advantageous implementation and development of these methods are linked indissolubly to a deeper understanding of the arterial response to combined mechanical and thermal loads. Despite this, the basic thermomechanical behavior of human blood vessels still remains largely unknown, primarily due to the lack of appropriate experimental data. In this work, the influence of temperature on the passive behavior of human carotid arteries was studied in vitro by means of inflation tests. Eleven carotid segments were tested in the range 0-200 mmHg at four different temperatures of 17, 27, 37, and 42[degrees]C. The results show that the combined change of temperature and stress has a dramatic effect on the dilatation coefficient of the arterial wall, which is shifted from negative to positive depending on the stress state, whereas the structural stiffness of the arterial wall does not change appreciably in the range of temperatures tested. blood vessels; inflation tests; thermal dilatation coefficient; mechanical properties; structural stiffness

Published
2005

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