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1

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Symposium on Evolutionary Origin of Feathers: Panel Discussion1

Maderson, Paul F. A. ; Homberger, Dominique G. ; Alibardi, Lorenzo ; [weitere]

Society for Integrative and Comparative Biology ; 2000

In: American Zoologist Vol. 40, No. 4 ( 2000-08), p. 695-706

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In: American Zoologist, Society for Integrative and Comparative Biology, Vol. 40, No. 4 ( 2000-08), p. 695-706

Materialart: Online-Ressource

ISSN: 0003-1569

URL: Article

DOI: 10.1668/0003-1569(2000)040[0695:SOEOOF]2.0.CO;2

RVK:

WA 15000

Sprache: Englisch

Verlag: Society for Integrative and Comparative Biology

Publikationsdatum: 2000

ZDB Id: 2159110-6

SSG: 12

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2

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The structure of the cornified claw sheath in the domesticated cat ( Felis catus ): implications for the claw‐shedding mechanism and the evolution of cornified digital end organs

Homberger, Dominique G. ; Ham, Kyungmin ; Ogunbakin, Tolulope ; [weitere]

Wiley ; 2009

In: Journal of Anatomy Vol. 214, No. 4 ( 2009-04), p. 620-643

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In: Journal of Anatomy, Wiley, Vol. 214, No. 4 ( 2009-04), p. 620-643

Kurzfassung: The morphology of cornified structures is notoriously difficult to analyse because of the extreme range of hardness of their component tissues. Hence, a correlative approach using light microscopy, scanning electron microscopy, three‐dimensional reconstructions based on x‐ray computed tomography data, and graphic modeling was applied to study the morphology of the cornified claw sheath of the domesticated cat as a model for cornified digital end organs. The highly complex architecture of the cornified claw sheath is generated by the living epidermis that is supported by the dermis and distal phalanx. The latter is characterized by an ossified unguicular hood, which overhangs the bony articular base and unguicular process of the distal phalanx and creates an unguicular recess. The dermis covers the complex surface of the bony distal phalanx but also creates special structures, such as a dorsal dermal papilla that points distally and a curved ledge on the medial and lateral sides of the unguicular process. The hard‐cornified external coronary horn and proximal cone horn form the root of the cornified claw sheath within the unguicular recess, which is deeper on the dorsal side than on the medial and lateral sides. As a consequence, their rate of horn production is greater dorsally, which contributes to the overall palmo‐apical curvature of the cornified claw sheath. The external coronary and proximal cone horn is worn down through normal use as it is pushed apically. The hard‐cornified apical cone horn is generated by the living epidermis enveloping the base and free part of the dorsal dermal papilla. It forms nested horn cones that eventually form the core of the hardened tip of the cornified claw. The sides of the cornified claw sheath are formed by the newly described hard‐cornified blade horn, which originates from the living epidermis located on the slanted face of the curved ledge. As the blade horn is moved apically, it entrains and integrates the hard‐cornified parietal horn on its internal side. It is covered by the external coronary and proximal cone horn on its external side. The soft‐cornified terminal horn extends distally from the parietal horn and covers the dermal claw bed at the tip of the uniguicular process, thereby filling the space created by the converging apical cone and blade horn. The soft‐cornified sole horn fills the space between the cutting edges of blade horn on the palmar side of the cornified claw sheath. The superficial soft‐cornified perioplic horn is produced on the internal side of the unguicular pleat, which surrounds the root of the cornified claw sheath. The shedding of apical horn caps is made possible by the appearance of microcracks in the superficial layers of the external coronary and proximal cone horn in the course of deformations of the cornified claw sheath, which is subjected to tensile forces during climbing or prey catching. These microcracks propagate tangentially through the coronary horn and do not injure the underlying living epidermal and dermal tissues. This built‐in shedding mechanism maintains sharp claw tips and ensures the freeing of the claws from the substrate.

Materialart: Online-Ressource

ISSN: 0021-8782 , 1469-7580

URL: Issue

URL: Article

DOI: 10.1111/joa.2009.214.issue-4

DOI: 10.1111/j.1469-7580.2009.01068.x

Sprache: Englisch

Verlag: Wiley

Publikationsdatum: 2009

ZDB Id: 1474856-3

SSG: 12

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3

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Symposium on Evolutionary Origin of Feathers: Panel Discussion

Maderson, Paul F. A. ; Homberger, Dominique G. ; Alibardi, Lorenzo ; [weitere]

Oxford University Press (OUP) ; 2000

In: American Zoologist Vol. 40, No. 4 ( 2000-08), p. 695-706

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In: American Zoologist, Oxford University Press (OUP), Vol. 40, No. 4 ( 2000-08), p. 695-706

Materialart: Online-Ressource

ISSN: 0003-1569

URL: Article

DOI: 10.1093/icb/40.4.695

RVK:

WA 15000

Sprache: Englisch

Verlag: Oxford University Press (OUP)

Publikationsdatum: 2000

ZDB Id: 2159110-6

SSG: 12

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4

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Do geese fully develop brood patches? A histological analysis of lesser snow geese (Chen caerulescens caerulescens) and Ross’s geese (C. rossii)

Jónsson, Jón Einar ; Afton, Alan D. ; Homberger, Dominique G. ; [weitere]

Springer Science and Business Media LLC ; 2006

In: Journal of Comparative Physiology B Vol. 176, No. 5 ( 2006-6), p. 453-462

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In: Journal of Comparative Physiology B, Springer Science and Business Media LLC, Vol. 176, No. 5 ( 2006-6), p. 453-462

Materialart: Online-Ressource

ISSN: 0174-1578 , 1432-136X

URL: Article

DOI: 10.1007/s00360-006-0066-y

RVK:

WA 15000

Sprache: Englisch

Verlag: Springer Science and Business Media LLC

Publikationsdatum: 2006

ZDB Id: 231245-1

ZDB Id: 1459302-6

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5

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Comparative Functional Morphology of the Head Suspension of Quadrupedal Cats and the Shoulder Suspension of Bipedal Humans

Osborn, Michelle L ; Homberger, Dominique G

Wiley ; 2012

In: The FASEB Journal Vol. 26, No. S1 ( 2012-04)

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In: The FASEB Journal, Wiley, Vol. 26, No. S1 ( 2012-04)

Materialart: Online-Ressource

ISSN: 0892-6638 , 1530-6860

URL: Issue

URL: Article

DOI: 10.1096/fsb2.v26.S1

DOI: 10.1096/fasebj.26.1_supplement.455.4

Sprache: Englisch

Verlag: Wiley

Publikationsdatum: 2012

ZDB Id: 1468876-1

SSG: 12

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6

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Biomechanical analysis of the human head‐neck‐shoulder complex: Asymmetry as a natural experiment

Osborn, Michelle L. ; Homberger, Dominique G.

Wiley ; 2011

In: The FASEB Journal Vol. 25, No. S1 ( 2011-04)

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In: The FASEB Journal, Wiley, Vol. 25, No. S1 ( 2011-04)

Materialart: Online-Ressource

ISSN: 0892-6638 , 1530-6860

URL: Issue

URL: Article

DOI: 10.1096/fsb2.v25.S1

DOI: 10.1096/fasebj.25.1_supplement.867.7

Sprache: Englisch

Verlag: Wiley

Publikationsdatum: 2011

ZDB Id: 1468876-1

SSG: 12

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7

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The Function and Evolution of the Mastoid Process and Clavicle in Humans: A Natural Experiment

Osborn, Michelle L ; Homberger, Dominique G

Wiley ; 2010

In: The FASEB Journal Vol. 24, No. S1 ( 2010-04)

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In: The FASEB Journal, Wiley, Vol. 24, No. S1 ( 2010-04)

Materialart: Online-Ressource

ISSN: 0892-6638 , 1530-6860

URL: Issue

URL: Article

DOI: 10.1096/fsb2.v24.S1

DOI: 10.1096/fasebj.24.1_supplement.lb9

Sprache: Englisch

Verlag: Wiley

Publikationsdatum: 2010

ZDB Id: 1468876-1

SSG: 12

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8

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Assessment of the mass, length, center of mass, and principal moment of inertia of body segments in adult males of the brown anole ( Anolis sagrei ) and green, or carolina, anole ( Anolis carolinensis )

Legreneur, Pierre ; Homberger, Dominique G. ; Bels, Vincent

Wiley ; 2012

In: Journal of Morphology Vol. 273, No. 7 ( 2012-07), p. 765-775

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In: Journal of Morphology, Wiley, Vol. 273, No. 7 ( 2012-07), p. 765-775

Kurzfassung: This study provides a morphometric data set of body segments that are biomechanically relevant for locomotion in two ecomorphs of adult male anoles, namely, the trunk‐ground Anolis sagrei and the trunk‐crown Anolis carolinensis . For each species, 10 segments were characterized, and for each segment, length, mass, location of the center of mass, and radius of gyration were measured or calculated, respectively. The radii of gyration were computed from the moments of inertia by using the double swing pendulum method. The trunk‐ground A. sagrei has relatively longer and stockier hindlimbs and forelimbs with smaller body than A. carolinensis . These differences between the two ecomorphs demonstrated a clear relationship between morphology and performance, particularly in the context of predator avoidance behavior, such as running or jumping in A. sagrei and crypsis in A. carolinensis . Our results provide new perspectives on the mechanism of adaptive radiation as the limbs of the two species appear to scale via linear factors and, therefore, may also provide explanations for the mechanism of evolutionary changes of structures within an ecological context. J. Morphol., 2012. © 2012 Wiley Periodicals, Inc.

Materialart: Online-Ressource

ISSN: 0362-2525 , 1097-4687

URL: Issue

URL: Article

DOI: 10.1002/jmor.v273.7

DOI: 10.1002/jmor.20022

Sprache: Englisch

Verlag: Wiley

Publikationsdatum: 2012

ZDB Id: 1479991-1

SSG: 12

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9

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Ernst Mayr and the complexity of life

Homberger, Dominique G.

Springer Science and Business Media LLC ; 2005

In: Journal of Biosciences Vol. 30, No. 4 ( 2005-9), p. 427-433

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In: Journal of Biosciences, Springer Science and Business Media LLC, Vol. 30, No. 4 ( 2005-9), p. 427-433

Materialart: Online-Ressource

ISSN: 0250-5991 , 0973-7138

URL: Article

DOI: 10.1007/BF02703715

Sprache: Englisch

Verlag: Springer Science and Business Media LLC

Publikationsdatum: 2005

ZDB Id: 2071290-X

SSG: 12

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10

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Steven J Gould — an appreciation

Homberger, Dominique G.

Springer Science and Business Media LLC ; 2002

In: Journal of Biosciences Vol. 27, No. 5 ( 2002-9), p. 455-459

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In: Journal of Biosciences, Springer Science and Business Media LLC, Vol. 27, No. 5 ( 2002-9), p. 455-459

Materialart: Online-Ressource

ISSN: 0250-5991 , 0973-7138

URL: Article

DOI: 10.1007/BF02705040

Sprache: Englisch

Verlag: Springer Science and Business Media LLC

Publikationsdatum: 2002

ZDB Id: 2071290-X

SSG: 12

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