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Articles 1 - 13 of 13
Full-Text Articles in Life Sciences
Shifts In Metabolic Demands In Growing Altricial Nestlings Illustrate Context-Specific Relationships Between Basal Metabolic Rate And Body Composition, Fraņois Vézina, Oliver P. Love, Mylaine Lessard, Tony D. Williams
Shifts In Metabolic Demands In Growing Altricial Nestlings Illustrate Context-Specific Relationships Between Basal Metabolic Rate And Body Composition, Fraņois Vézina, Oliver P. Love, Mylaine Lessard, Tony D. Williams
Integrative Biology Publications
Basal metabolic rate (BMR) in animals is interpreted as reflecting the size and metabolic intensity of energy-consuming tissues. However, studies investigating relationships between the mass of specific organs and interindividual variation in BMR have produced inconsistent patterns with regard to which organs have the largest impact on BMR variation. Because of the known flexibility in organ mass and metabolic intensity within individual organs, relationships between BMR and body- composition variables are bound to be context specific. Altricial nestlings are excellent models to illustrate this phenomenon because of the extreme variation in body composition occurring during growth. Using European starlings at …
Juveniles Exposed To Embryonic Corticosterone Have Enhanced Flight Performance, Eunice H. Chin, Oliver P. Love, Jan J. Verspoor, Tony D. Williams, Kyle Rowley, Gary Burness
Juveniles Exposed To Embryonic Corticosterone Have Enhanced Flight Performance, Eunice H. Chin, Oliver P. Love, Jan J. Verspoor, Tony D. Williams, Kyle Rowley, Gary Burness
Integrative Biology Publications
Exposure to maternally derived glucocorticoids during embryonic development impacts offspring phenotype. Although many of these effects appear to be transiently 'negative', embryonic exposure to maternally derived stress hormones is hypothesized to induce preparative responses that increase survival prospects for offspring in low-quality environments; however, little is known about how maternal stress influences longer-term survival-related performance traits in free-living individuals. Using an experimental elevation of yolk corticosterone (embryonic signal of low maternal quality), we examined potential impacts of embryonic exposure to maternally derived stress on flight performance, wing loading, muscle morphology and muscle physiology in juvenile European starlings (Sturnus vulgaris). Here …
Development Of Ecological Indicators For The U.S. Great Lakes Coastal Region – A Summary Of Applications In Lake Huron, Gerald J. Niemi, Valerie J. Brady, Terry N. Brown, Jan J.H. Ciborowski, Nicholas P. Danz, Dana M. Ghioca, Joann M. Hanowski, Tom P. Hollenhorst, Robert W. Howe, Lucinda B. Johnson., Carol A. Johnston, Euan D. Reavie
Development Of Ecological Indicators For The U.S. Great Lakes Coastal Region – A Summary Of Applications In Lake Huron, Gerald J. Niemi, Valerie J. Brady, Terry N. Brown, Jan J.H. Ciborowski, Nicholas P. Danz, Dana M. Ghioca, Joann M. Hanowski, Tom P. Hollenhorst, Robert W. Howe, Lucinda B. Johnson., Carol A. Johnston, Euan D. Reavie
Biological Sciences Publications
No abstract provided.
Gene Expression Patterns In Heterozygous Plk4 Murine Embryonic Fibroblasts, Alan Morettin, Alejandra Ward, Nantais, Jordan Nantais, Jordan, John W. Hudson
Gene Expression Patterns In Heterozygous Plk4 Murine Embryonic Fibroblasts, Alan Morettin, Alejandra Ward, Nantais, Jordan Nantais, Jordan, John W. Hudson
Biological Sciences Publications
The polo-like kinases (Plks) are a group of serine/threonine kinases which have roles in many aspects of cellular function including the regulation of mitotic activity and cellular stress responses. This study focuses on Plk4, the most divergent member of the Plk family, which is necessary for proper cellular proliferation. More specifically, alterations in Plk4 levels cause significantly adverse mitotic defects including abnormal centrosome duplication and aberrant mitotic spindle formation. We sought to clarify the effect of reduced Plk4 levels on the cell by examining transcript profiles of Plk4 wild-type and heterozygous mouse embryonic fibroblasts (MEFs). Subsequently, the levels of several …
Shifts In Metabolic Demands In Growing Altricial Nestlings Illustrate Context-Specific Relationships Between Basal Metabolic Rate And Body Composition, Francois Vezina, Oliver P. Love, Mylaine Lessard, Tony D. Williams
Shifts In Metabolic Demands In Growing Altricial Nestlings Illustrate Context-Specific Relationships Between Basal Metabolic Rate And Body Composition, Francois Vezina, Oliver P. Love, Mylaine Lessard, Tony D. Williams
Biological Sciences Publications
Basal metabolic rate (BMR) in animals is interpreted as reflecting the size and metabolic intensity of energy-consuming tissues. However, studies investigating relationships between the mass of specific organs and interindividual variation in BMR have produced inconsistent patterns with regard to which organs have the largest impact on BMR variation. Because of the known flexibility in organ mass and metabolic intensity within individual organs, relationships between BMR and body-composition variables are bound to be context specific. Altricial nestlings are excellent models to illustrate this phenomenon because of the extreme variation in body composition occurring during growth. Using European starlings at three …
The Condition Conundrum: Application Of Multiple Condition Indices To The Dusky Shark Carcharhinus Obscurus, N. E. Hussey, D. T. Cocks, Dudley, S.F.J. Dudley, S.F.J., I. D. Mccarthy, S. P. Wintner
The Condition Conundrum: Application Of Multiple Condition Indices To The Dusky Shark Carcharhinus Obscurus, N. E. Hussey, D. T. Cocks, Dudley, S.F.J. Dudley, S.F.J., I. D. Mccarthy, S. P. Wintner
Biological Sciences Publications
No abstract provided.
Expression Of Cap2 During Early Xenopus Embryogenesis, Marian Wolanski, Farhad Khosrowshahian, L Jerant, Ing-Suan Jap
Expression Of Cap2 During Early Xenopus Embryogenesis, Marian Wolanski, Farhad Khosrowshahian, L Jerant, Ing-Suan Jap
Biological Sciences Publications
We have cloned and characterized a second member of the Xenopus CAP (cyclase associated protein) gene family. xCAP2 demonstrates greater restriction of expression than its homolog, xCAP1, and is differentially expressed throughout early embryogenesis. Although present as a maternal transcript, CAP2 comes to be expressed in the anterior-most mesoderm/endoderm during late gastrulation, in paraxial mesoderm during late neurula stages, and later expresses in lens, cardiac primordia, somites, otic vesicles, retina,and in the optic and craniofacial musculature. The gene is also expressed in the leading edge of myotome.
Xarx2: An Aristaless Homolog That Regulates Brain Regionalization During Development In Xenopus Laevis, Marian Wolanski, Farhad Khosrowshahian, Le Kelly, Michael J. Crawford
Xarx2: An Aristaless Homolog That Regulates Brain Regionalization During Development In Xenopus Laevis, Marian Wolanski, Farhad Khosrowshahian, Le Kelly, Michael J. Crawford
Biological Sciences Publications
The aristaless-related gene, Arx, plays a fundamental role in patterning the brain in humans and mice. Arx mutants exhibit lissencephaly among other anomalies. We have cloned a Xenopus aristaless homolog that appears to define specific regions of the developing forebrain. xArx2 is transcribed in blastula through neurula stages, and comes to be restricted to the ventra and lateral telencephalon, lateral diencephalon, neural floor plate of the anterior spinal cord, and somites. In this respect, Arx2 expresses in regions similar to Arx with the exception of the somites. Overexpression enlarges the telencephalon, and interference by means of antisense morpholino-mediated translation knockdown …
The Cyclin-Dependent Kinase Activator, Spy1a, Is Targeted For Degradation By The Ubiquitin Ligase Nedd4, Mohammad Al Sorkhy, Ryan Craig, Brenna Market, Ryan Ard, Lisa A. Porter
The Cyclin-Dependent Kinase Activator, Spy1a, Is Targeted For Degradation By The Ubiquitin Ligase Nedd4, Mohammad Al Sorkhy, Ryan Craig, Brenna Market, Ryan Ard, Lisa A. Porter
Biological Sciences Publications
Spy1A is a cyclin-like protein required for progression through the G(1)/S phase of the cell cycle. Elevated Spy1A protein levels have been implicated in tumorigenesis and are attributed to overriding the DNA damage response and enhancing cell proliferation. Understanding how Spy1A is produced and degraded is essential in resolving how it contributes to normal and abnormal growth processes. Herein, we demonstrate that Spy1A is degraded in a cell cycle-dependent manner during mitosis via the ubiquitin-proteasome system. We have resolved the E3 ligase and essential phosphorylation sites mediating Spy1A degradation. Furthermore, we have determined that non-degradable forms of Spy1A do not …
Mate Choice For Nonadditive Genetic Benefits And The Maintenance Of Genetic Diversity In Song Sparrows, Bryan D. Neff, Trevor E. Pitcher
Mate Choice For Nonadditive Genetic Benefits And The Maintenance Of Genetic Diversity In Song Sparrows, Bryan D. Neff, Trevor E. Pitcher
Great Lakes Institute for Environmental Research Publications
The lek paradox asserts that strong directional selection via female choice should deplete additive genetic variation in fitness and consequently any benefit to females expressing the preference. Recently, we have provided a novel resolution to the paradox by showing that nonadditive genetic effects such as overdominance can be inherited from parent to offspring, and populations with females that express a mating preference for outbred males maintain higher genetic variation than populations with females that mate randomly. Here, we test our dynamic model using empirical data previously published from a small island population of song sparrows (Melospiza melodia). The model assumes …
Development Of A Cohesion Questionnaire For Youth: The Youth Sport Environment Questionnaire, Mark Eys, Todd M. Loughead, Steven R. Bray
Development Of A Cohesion Questionnaire For Youth: The Youth Sport Environment Questionnaire, Mark Eys, Todd M. Loughead, Steven R. Bray
Human Kinetics Publications
The purpose of the current study was to initiate the development of a psychometrically sound measure of cohesion for youth sport groups. A series of projects were undertaken in a four-phase research program. The initial phase was designed to garner an understanding of how youth sport group members perceived the concept of cohesion through focus groups (n = 56), open-ended questionnaires (n = 280), and a literature review. In Phase 2, information from the initial projects was used in the development of 142 potential items and content validity was assessed. In Phase 3, 227 participants completed a revised 87-item questionnaire. …
Factors Affecting Repeat Visitation And Flow-On Tourism As Sources Of Event Strategy Sustainability, Marijke Taks, Laurence Chalip, B. Christine Green, Stefan Kesenne
Factors Affecting Repeat Visitation And Flow-On Tourism As Sources Of Event Strategy Sustainability, Marijke Taks, Laurence Chalip, B. Christine Green, Stefan Kesenne
Human Kinetics Publications
The sustainability of including medium sized one-time sport events in an event portfolio is examined with reference to the capacity of one such event to stimulate flow-on tourism (i.e. tourism activities beyond the event but around the time of the event), a desire to return to the destination, and positive word-of-mouth. Relationships among four motives (socialising, escape, learning about the destination, and learning about athletics), identification with the event (self and social identity), previous visitation to the host destination, information search, tourism activities, and likelihood of recommending and/or returning to the host destination were examined for four categories of attendees …
Canadian National Sport Organisations’ Use Of The Web For Relationship Marketing In Promoting Sport Participation, Vassil Girginov, Marijke Taks, B. Boucher, M. Holman
Canadian National Sport Organisations’ Use Of The Web For Relationship Marketing In Promoting Sport Participation, Vassil Girginov, Marijke Taks, B. Boucher, M. Holman
Human Kinetics Publications
Sport participation development requires a systematic process which involves knowledge creation, dissemination and interactions between National Sport Organisations, participants, clubs and associations as well as other agencies. Using a relationship marketing approach (Grönroos, 1997, Gummesson, 2002, Olkkonen, 1999), this paper addressed the question ‘How do Canadian NSOs use the Web, in terms of functionality and services offered, to create and maintain relationships with sport participants and their sport delivery partners?’ Ten Canadian NSOs’ websites were examined: functionality was analysed using Burgess and Cooper’s (2000) eMICA model, while NSOs’ utilisation of the Internet to establish and maintain relationships with sport participants …