title: Reversible stress softening of collagen based networks from the jumbo squid mantle (Dosidicus gigas).
abstract: Dosidicus gigas is the largest and one of the most abundant jumbo squids in the eastern Pacific Ocean. In this paper we have studied the muscle of the mantle of D. gigas (DGM). Morphological, thermal and rheological properties were assessed by means of atomic force microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, differential scanning calorimetry, thermogravimetry and oscillatory rheometry. This study allowed us to assess the morphological and rheological properties of a collagen based network occurring in nature. The results showed that the DGM network displays a nonlinear effect called reversible stress softening (RSS) that has been previously described for other types of biological structures such as naturally occurring cellulose networks and actin networks. We propose that the RSS could play a key role on the way jumbo squids withstand hydrostatic pressure. The results presented here confirm that this phenomenon occurs in a wider number of materials than previously thought, all of them exhibiting different size scales as well as physical conformation.
authors.affiliation: Department of Mechanical Engineering, Catholic University of Peru, Lima 32, Peru. Electronic address: fgtorres@pucp.edu.pe.
authors.forename: F G
authors.initials: FG
authors.lastname: Torres
authors.affiliation: Department of Mechanical Engineering, Catholic University of Peru, Lima 32, Peru.
authors.forename: O P
authors.initials: OP
authors.lastname: Troncoso
authors.affiliation: Department of Mechanical Engineering, Catholic University of Peru, Lima 32, Peru.
authors.forename: E R
authors.initials: ER
authors.lastname: Rivas
authors.affiliation: Departament de Química Física and Institut de Ciencia dels Materials, Universitat de València, Dr. Moliner 50, Burjassot, E-46100 Valencia, Spain.
authors.forename: C G
authors.initials: CG
authors.lastname: Gomez
authors.affiliation: Instituto de Ciencia y Tecnología de Polímeros, C.S.I.C., Calle Juan de la Cierva 3, 28006 Madrid, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Lopez
mesh_terms: D000199:Actins; D000818:Animals; D003094:Collagen / Q000737:chemistry / Q000378:metabolism*; D049832:Decapodiformes; D055119:Elastic Modulus; D006874:Hydrostatic Pressure; D009132:Muscles / Q000737:chemistry / Q000378:metabolism*; D012212:Rheology; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000199:Actins; D014867:Water; D003094:Collagen
keywords: Collagen; Jumbo squid; Reversible stress softening