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Biology

2015

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Articles 2161 - 2165 of 2165

Full-Text Articles in Life Sciences

Corrosion Casts: A Novel Application Of A Polyurethane Resin (Pu4ii) For Visualizing Eggshell Pore Morphology, Given Harper, Jason P. Murphy, Mark T. Swanson, William B. Jaeckle Dec 2014

Corrosion Casts: A Novel Application Of A Polyurethane Resin (Pu4ii) For Visualizing Eggshell Pore Morphology, Given Harper, Jason P. Murphy, Mark T. Swanson, William B. Jaeckle

Given Harper

Avian eggshells serve the dual purposes of protecting the developing embryo from the external environment while also facilitating the loss of water vapor and the required exchange of CO2 and O2 gases. Pores that span the eggshell enable the loss of water and trans-shell gas exchange. Although knowledge of the geometry of these spaces is necessary to generate accurate estimates of the rate of gas diffusion across the shell, few techniques exist to obtain these data. Estimates of gas conductance across eggshells are typically calculated from eggshell thickness and the size and number of the pores on the exterior eggshell …

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Corrosion Casts: A Novel Application Of A Polyurethane Resin (Pu4ii) For Visualizing Eggshell Pore Morphology, Jason P. Murphy, Mark T. Swanson, William Jaeckle, R. Given Harper Dec 2014

Corrosion Casts: A Novel Application Of A Polyurethane Resin (Pu4ii) For Visualizing Eggshell Pore Morphology, Jason P. Murphy, Mark T. Swanson, William Jaeckle, R. Given Harper

William Jaeckle

Avian eggshells serve the dual purposes of protecting the developing embryo from the external environment while also facilitating the loss of water vapor and the required exchange of CO2 and O2 gases. Pores that span the eggshell enable the loss of water and trans-shell gas exchange. Although knowledge of the geometry of these spaces is necessary to generate accurate estimates of the rate of gas diffusion across the shell, few techniques exist to obtain these data. Estimates of gas conductance across eggshells are typically calculated from eggshell thickness and the size and number of the pores on the exterior eggshell …

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Tradeoffs Of Warm Adaptation In Aquatic Ectotherms: Live Fast, Die Young?, Eloy Martinez, Anthony P. Porreca, Robert E. Colombo, Michael A. Menze Dec 2014

Tradeoffs Of Warm Adaptation In Aquatic Ectotherms: Live Fast, Die Young?, Eloy Martinez, Anthony P. Porreca, Robert E. Colombo, Michael A. Menze

Eloy Martinez

In the face of a changing climate, questions regarding sub-lethal effects of elevated habitat temperature on the physiology of ectotherms remain unanswered. In particular, long-term responses of ectotherms to the warming trend in tropical regions are unknown, and understudied due to the difficulties in specimen and community traceability. In freshwater lakes employed as cooling reservoirs for power plants, increased physiological stress from high water temperature can potentially alter the community structure of fishes. We employ this highly tractable system to assess how thermal regimes can alter the physiology and ecology of aquatic species. We documented a significantly reduced lifespan, growth …

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On The Intrinsic Value Of Genetic Integrity, Attila Tanyi Dec 2014

On The Intrinsic Value Of Genetic Integrity, Attila Tanyi

Attila Tanyi

In their article “Is There a Prima Facie Duty to Preserve Genetic Integrity in Conservation Biology?” Yasha Rower and Emma Harris argue that there is no underived prima facie obligation to preserve genetic integrity. In particular, it is argued that there is no such obligation because genetic integrity has no intrinsic value. In this commentary I raise doubts about this part of the authors’ argument. I argue that (1) there might well be at least prima facie value in genetic integrity, (2) that the Moorean isolation test the authors use might not work in their favour, and (3) that connecting …

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A New Resource To Aid In The Identification And Management Of Aquaculture Production Hazards, Joseph Buttner Dec 2014

A New Resource To Aid In The Identification And Management Of Aquaculture Production Hazards, Joseph Buttner

Joseph Buttner

Each year, the aquaculture industry experiences significant economic losses as a result of pathogens that cause disease, pests that render product unmarketable, operational mishaps, adverse weather events, and closures of harvest areas due to the presence of organisms with the potential to cause human illness. Collectively, we refer to these as aquaculture production hazards, which present considerable risk to operations. Massive loss of farmed product and human illness caused from ingestion of unknowingly contaminated product both adversely impact profitability, trade, and public perception. The ability of professionals to assist farmers is often limited by a lack of farm-level monitoring, record …

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