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Theses/Dissertations

2013

Biology

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Articles 481 - 486 of 486

Full-Text Articles in Life Sciences

Quantifying The Effects Of Antibiotics Upon Benthic Diatoms And Marine Benthic Algal Communities, Isaac M. Hagenbuch Jan 2013

Quantifying The Effects Of Antibiotics Upon Benthic Diatoms And Marine Benthic Algal Communities, Isaac M. Hagenbuch

Theses and Dissertations

Antibiotics are a cornerstone of modern medicine. Their ability to impair prokaryotic metabolism has saved the lives of many millions of humans in the decades since wide antibiotic usage began. Antibiotic compounds are also widely used in the husbandry of animals that are used for food but, unfortunately, much of the antibiotic mass that goes into humans and animals is excreted unchanged. Those excretions go, directly or indirectly, into aquatic ecosystems. The discovery of this fact has led to a growing global concern about the fate of antibiotics in the environment. This concern is driven by no fewer than three ...


Habitat And Fish Population Dynamics: Advancing Stock Assessments Of Highly Migratory Species, Patrick D. Lynch Jan 2013

Habitat And Fish Population Dynamics: Advancing Stock Assessments Of Highly Migratory Species, Patrick D. Lynch

Dissertations, Theses, and Masters Projects

Fisheries sustainability is inherently linked to an understanding of the population-level effects of fishing. With an accurate characterization of historical fish and fishery dynamics, management agencies are more equipped to create regulations that sustain fishery resources over the long term. The overarching goal of this dissertation is to contribute to the advancement of fisheries stock assessment and promote resource sustainability. My research focused on highly migratory species (HMS), particularly fishes that reside in the open ocean. These species constitute some of the highest valued global fisheries; however, numerous factors compromise HMS stock assessment and management. These challenges are fully described ...


The Effects Of Harvest Regime, Irrigation, And Salinity On Stem Lignocellulosic Concentrations In Alfalfa (Medicago Sativa L.), Adam Harvey Warnke Jan 2013

The Effects Of Harvest Regime, Irrigation, And Salinity On Stem Lignocellulosic Concentrations In Alfalfa (Medicago Sativa L.), Adam Harvey Warnke

All Theses, Dissertations, and Other Capstone Projects

Rapid consumption of crude oil reserves has made it necessary to find methods of processing a renewable and sustainable feedstock for conversion into ethanol. Lignocellulosic feedstocks are promising because they are typically environmentally friendly and can meet the high-yield potential necessary for ethanol production. Alfalfa (Medicago sativa L.) has promise as a feedstock for ethanol production because of its high biomass yields, perennial-habit, relationship with nitrogen-fixing bacteria, and other co-products. This study focused on the effects of harvest regime, irrigation, and salinity on stem lignocellulosic concentrations in alfalfa for ethanol production during the 2010 and 2011 growing seasons in southern ...


Dehydration In Southern Toads (Anaxyrus Terrestris): Metabolic Costs And Effects Of Temperature Selection, Claire E. Forster Jan 2013

Dehydration In Southern Toads (Anaxyrus Terrestris): Metabolic Costs And Effects Of Temperature Selection, Claire E. Forster

Scripps Senior Theses

Southern toads (Anaxyrus terrestris) are ectothermic terrestrial amphibians. As such they are sensitive to thermal and hydric variability. The interactive effect of hydration state and body temperature is not well understood. The aim of this study is to determine if the costs of dehydration vary at different temperatures and if so, whether toads will select different temperatures to minimize these costs. Costs of dehydration were evaluated by measuring metabolic rate at 100% and 85% hydration state, at 30 and 20 oC. Temperature selection of toads at 100% and 85% hydration state was measured using a thermal gradient. Body temperature ...


Role Of The Drosophila Melanogaster Indirect Flight Muscles In Flight And Male Courtship Song: Studies On Flightin And Mydson Light Chain - 2, Samya Chakravorty Jan 2013

Role Of The Drosophila Melanogaster Indirect Flight Muscles In Flight And Male Courtship Song: Studies On Flightin And Mydson Light Chain - 2, Samya Chakravorty

Graduate College Dissertations and Theses

Complex behaviors using wings have facilitated the insect evolutionary success and diversification. The Drosophila indirect flight muscles (IFM) have evolved a highly ordered myofilament lattice structure and uses oscillatory contractions by pronounced stretch activation mechanism to drive the wings for high powered flight subject to natural selection. Moreover, the IFM is also utilized during small amplitude wing vibrations for species-specific male courtship song (sine and pulse), an important Drosophila mating behavior subject to sexual selection. Unlike flight, the contractile mechanism and contribution of any muscle gene in courtship song is not known. To gain insight into how separate selection regimes ...


The Effects Of Nickel Chloride Stress On Freshwater Cyanobacterium Synechococcus Sp. Iu 625, Brian Nohomovich Jan 2013

The Effects Of Nickel Chloride Stress On Freshwater Cyanobacterium Synechococcus Sp. Iu 625, Brian Nohomovich

Seton Hall University Dissertations and Theses (ETDs)

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