15164371

Source:http://linkedlifedata.com/resource/pubmed/id/15164371

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Predicate	Object
rdf:type	pubmed:Citation
lifeskim:mentions	umls-concept:C0035007, umls-concept:C0225324, umls-concept:C0225326, umls-concept:C0678594, umls-concept:C1095834
pubmed:issue	1
pubmed:dateCreated	2004-5-27
pubmed:abstractText	This study investigated the functional morphology of the blubber that forms the caudal keels of the harbor porpoise (Phocoena phocoena). Blubber is a pliant biocomposite formed by adipocytes and structural fibers composed of collagen and elastic fibers. Caudal keels are dorsally and ventrally placed triangular wedges of blubber that define the hydrodynamic profile of the porpoise tailstock. Mechanical tests on carcasses demonstrate that when keels are bent, they strain nonuniformly along their lengths, with highest strains just caudal to the dorsal fin and lowest at the insertion of the flukes. Therefore, caudal keels undergo nonuniform longitudinal deformation while maintaining a stable, triangular cross-sectional shape. Polarizing and transmitted light microscopy techniques were used to investigate blubber's 3D fiber architecture along the length of the dorsal keel. The triangular cross-sectional shape of the keel appears to be maintained by structural fibers oriented to act as tensile stays. The construction of the blubber composite is regionally specific :structural fiber densities and diameters are higher in the relatively stiff caudal region of the keel than in the more deformable cranial keel region. The orientations of structural fibers also change along the length of the keel. Cranially, no fibers are oriented along the long axis, whereas a novel population of longitudinally oriented fibers reinforces the keel at the insertion of the flukes. Thus, differences in the distribution and orientation of structural fibers contribute to the regionally specific mechanical properties of the dorsal keel.
pubmed:language	eng
pubmed:journal	http://linkedlifedata.com/resource/pubmed/journal/0406125
pubmed:citationSubset	IM
pubmed:status	MEDLINE
pubmed:month	Jul
pubmed:issn	0362-2525
pubmed:author	pubmed-author:DillamanRichard MRM, pubmed-author:HamiltonJonna LJL, pubmed-author:McLellanWilliam AWA, pubmed-author:PabstD AnnDA
pubmed:copyrightInfo	Copyright 2004 Wiley-Liss, Inc.
pubmed:issnType	Print
pubmed:volume	261
pubmed:owner	NLM
pubmed:authorsComplete	Y
pubmed:pagination	105-17
pubmed:dateRevised	2006-11-15
pubmed:meshHeading	pubmed-meshheading:15164371-Animal Structures, pubmed-meshheading:15164371-Animals, pubmed-meshheading:15164371-Porpoises
pubmed:year	2004
pubmed:articleTitle	Structural fiber reinforcement of keel blubber in harbor porpoise (Phocoena phocoena).
pubmed:affiliation	University of North Carolina at Wilmington, Department of Biological Sciences, 28403,USA.
pubmed:publicationType	Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't