Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

2014

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 8041 - 8070 of 136478

Full-Text Articles in Entire DC Network

The Influence Of Proton Order On The Thermal Conductivity Of Ice, Jonathan Tammo Siebert Dec 2014

The Influence Of Proton Order On The Thermal Conductivity Of Ice, Jonathan Tammo Siebert

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Water is one of the most important reasons for the possibility of life on earth. Even though water and ice have been in the focus of countless studies they are far from being understood. Despite their simple molecular structure, especially the ability of the molecule to form hydrogen bonds leads to a variety of interesting properties. One of them is the density maximum of water in its liquid state. This is caused by the hydrogen bound hexagonal structure of low pressure ice. In this work the influence of proton ordering on the thermal conductivity of hexagonal ice is examined. It …

Go to article

Nuclear Quantum Effects In Ice Phases And Water From First Principles Calculations, Betul Pamuk Dec 2014

Nuclear Quantum Effects In Ice Phases And Water From First Principles Calculations, Betul Pamuk

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Despite the simplicity of the molecule, condensed phases of water show many physical anomalies, some of which are still unexplained to date. This thesis focuses on one striking anomaly that has been largely neglected and never explained. When hydrogen (1H) is replaced by deuterium (2 D), zero point fluctuations of the heavy isotope causes ice to expand, whereas in normal isotope effect, heavy isotope causes volume contraction. Furthermore, in a normal isotope effect, the shift in volume should decrease with increasing temperature, while, in ice, the volume shift increases with increasing temperature and persists up to the melting temperature and …

Go to article

Bolometric Effect And Phonon Cooling In Graphene-Superconductor Junctions, Heli Vora Dec 2014

Bolometric Effect And Phonon Cooling In Graphene-Superconductor Junctions, Heli Vora

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Graphene, a two-dimensional allotrope of graphite, possesses remarkable electronic properties which stem from the fact that the electrons in graphene are described by the Dirac-Weyl Hamiltonian. As a result, graphene exhibits a linear energy dispersion relation with zero effective mass. With its single-atomic-layer thickness, not only electrons but also phonons are of a two dimensional nature, differentiating graphene from the conventional semiconductor based two-dimensional electron gas systems. The combination of two-dimensional phonons, ultra small volume, low density of states and linear energy spectrum allows graphene to have weak electron-phonon coupling and extremely small electronic heat capacity. These properties make it …

Go to article

Qcd Factorization For Heavy Quarkonium Production And Fragmentation Functions, Hong Zhang Dec 2014

Qcd Factorization For Heavy Quarkonium Production And Fragmentation Functions, Hong Zhang

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

From the Tevatron and the LHC data, it is clear that current models for the heavy quarkonium production are not able to explain the polarization of produced heavy quarkonia at large transverse momentum pT. A new approach to evaluate the heavy quarkonium production, by expanding the cross section in powers of 1/pT before the expansion in powers of &alphas, was proposed recently. In terms of the QCD factorization, it is proved that both the leading and next-to-leading power terms in 1/pT for the cross sections can be systematically factorized to all orders in powers …

Go to article

Phosphoinositide 3-Kinase (Pi3k) P11alpha Catalytic Subunit In Adipose Tissue Regulates Systemic Metabolism, Victoria Leigh Boughton Dec 2014

Phosphoinositide 3-Kinase (Pi3k) P11alpha Catalytic Subunit In Adipose Tissue Regulates Systemic Metabolism, Victoria Leigh Boughton

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Adipose tissue is a highly insulin responsive organ that contributes to metabolic regulation. Insulin resistance in the adipose tissue affects systemic lipid and glucose homeostasis. Phosphoinositide 3-kinase (PI3K) mediates downstream insulin signaling in adipose tissue, but its physiological role in vivo remains unclear. Using Cre recombinase driven by the aP2 promoter, we created mice that lack the class 1A PI3K catalytic subunit p110alpha or p110beta specifically in the white and brown adipose tissue. The loss of p11alpha, not p110beta, resulted in increased adiposity, glucose intolerance and liver steatosis. Mice lacking p110alpha in adipose tissue exhibited a decrease in energy expenditure …

Go to article

The Impact Of The National Economy On Supreme Court Decision Making, Joshua Matthew Johnson Dec 2014

The Impact Of The National Economy On Supreme Court Decision Making, Joshua Matthew Johnson

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Is the decision making of the Supreme Court of the United States influenced by the health of the national economy? In the development of the literature on the Supreme Court, scholars have mainly focused on how legal, attitudinal, and strategic considerations impact judicial decision making. There has been less work focusing on exogenous factors such as the economy. In this dissertation, I hypothesize that the Supreme Court is responsive to the national economy during multiple stages of the decision making process of the Court--case selection, voting, and the opinion stage. In a sense, I posit that the justices of the …

Go to article

The Authoritarian Party Identity And Its Impact On American Political Polarization, Julie Ann Wronski Dec 2014

The Authoritarian Party Identity And Its Impact On American Political Polarization, Julie Ann Wronski

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Political scientists and pundits alike have characterized the American electorate as being increasingly polarized in recent decades. This polarization has been framed in the context of the " culture war," where party elites and citizens have become more ideologically divided on salient social issues. Recent contributions by political scientists suggest that the sources of " culture war" polarization are more deeply rooted in individual traits, and that partisan polarization represents a " worldview evolution" that has split citizens into Democratic and Republican camps on the basis of their needs for order, certainty, and security - conceptualized as authoritarianism. This argument …

Go to article

Ready, Set, Change: An Exploratory Case Study Of Readiness For Change Within Five New York State Voluntary Child Welfare Agencies, Jennette Allen-Mccombs Dec 2014

Ready, Set, Change: An Exploratory Case Study Of Readiness For Change Within Five New York State Voluntary Child Welfare Agencies, Jennette Allen-Mccombs

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Each year, significant financial resources are expended to implement new policies and programs in an attempt to facilitate organizational change (Fleming, Culler, McCorkle, Becker, & Ballard, 2011). In 2007, the New York State Office of Children and Family Services (OCFS) collaborated with Andrus Center for Learning and Innovation (ACLI) to implement the Sanctuary Model of organizational change within selected voluntary residential child welfare programs that serve youth with behavioral, emotional and social challenges. Since these organizations typically have bureaucratic structures in which culture is maintained through a set of rules and regulations, change may be particularly difficult (Dickinson & Perry, …

Go to article

You Are Not What You Eat: The Myth Of School Food And Child Obesity, Elana Needle Dec 2014

You Are Not What You Eat: The Myth Of School Food And Child Obesity, Elana Needle

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Abstract of the Dissertation You are Not What You Eat: The Myth of School Food and Child Obesity by Elana Needle Doctor of Philosophy in Social Welfare Stony Brook University 2014 Childhood obesity is a hot topic in the research and policy literature, as well as in the popular press. However, much of the present research concentrates on one or a few variables, rather than adequately assessing the underlying structures that inherently complicate the childhood obesity epidemic. Using a logistic regression examining the school food environment in the 8th grade wave of the ECLS-K data set, this study's findings supports …

Go to article

Acculturation Experiences Of Latina Immigrants In Suffolk County, New York: A Grounded Theory Study, Jennifer Wood Dec 2014

Acculturation Experiences Of Latina Immigrants In Suffolk County, New York: A Grounded Theory Study, Jennifer Wood

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

This study examines the process of acculturation for female Latina immigrants in Suffolk County, New York. Thirty in-depth audiotaped interviews were conducted with adult women who were born in Mexico, El Salvador, or Ecuador and a theoretical model for acculturation was constructed using grounded theory methodology. The model reflects the lived experiences and perceptions of the participants. It also provides a number of factors involved in the acculturative process and attainment of acculturative goals for the participants. Social, psychological, cultural, and environmental supports and barriers are presented that impact the acculturative process. Findings suggest that the level of acculturation attained …

Go to article

Multi-Armed Bandits With Applications To Markov Decision Processes And Scheduling Problems, Isa Mithqal Muqattash Dec 2014

Multi-Armed Bandits With Applications To Markov Decision Processes And Scheduling Problems, Isa Mithqal Muqattash

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

The focus of this work is on practical applications of stochastic multi-armed bandits (MABs) in two distinctive settings. First, we develop and present REGA, a novel adaptive sampling-based algorithm for control of finite-horizon Markov decision processes (MDPs) with very large state spaces and small action spaces. We apply a variant of the epsilon-greedy multi-armed bandit algorithm to each stage of the MDP in a recursive manner, thus computing an estimation of the " reward-to-go" value at each stage of the MDP. We provide a finite-time analysis of REGA. In particular, we provide a bound on the probability that the approximation …

Go to article

Climatology And Predictability Of Cool-Season High Wind Events In The New York City Metropolitan And Surrounding Area, Michael Layer Dec 2014

Climatology And Predictability Of Cool-Season High Wind Events In The New York City Metropolitan And Surrounding Area, Michael Layer

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Damaging wind events not associated with severe convective storms or tropical cyclones can occur over the Northeast U.S. during the cool season and can cause significant problems with transportation, infrastructure, and public safety. These non-convective wind events (NCWEs) events are difficult for operational forecasters to predict in the NYC region as revealed by relatively poor verification statistics in recent years. This study investigates the climatology of NCWEs occurring between 15 September and 15 May over 13 seasons from 2000-2001 through 2012-2013. The events are broken down into three distinct types commonly observed in the region: pre-cold frontal (PRF), post-cold frontal …

Go to article

The Influence Of Biogenic Opal On 231pa/230th In Sediments From The Bermuda Rise And Its Implication For Paleocirculation Reconstructions, Theresa Marie King Dec 2014

The Influence Of Biogenic Opal On 231pa/230th In Sediments From The Bermuda Rise And Its Implication For Paleocirculation Reconstructions, Theresa Marie King

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Thermohaline circulation is responsible for the global transport of heat in surface waters of the ocean, and variability in this circulation has been linked to both short- and long-term climate change on time scales ranging from centuries to tens of thousands of years. Accurate reconstructions of past variability are thus critical to understanding modern and future thermohaline circulation changes and the response of the global climate system. The main circulation feature in the Atlantic is Atlantic Meridional Overturning Circulation (AMOC), and has been reconstructed using a variety of static proxies, but more recently through the use of sedimentary 231Paxs …

Go to article

The Effect Of Patch Dynamics And Nutrient Availability On The Production Of Zostera Marina Seeds Within Shinnecock Bay, Ny, Lisa Jackson Dec 2014

The Effect Of Patch Dynamics And Nutrient Availability On The Production Of Zostera Marina Seeds Within Shinnecock Bay, Ny, Lisa Jackson

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Exposing Zostera marina to fertilized porewater has been shown to increase vegetative shoot density and leaf growth rates, as well as affect morphological shoot characteristics including increasing leaf length, leaf area and the number of leaves per shoot. However, aside from changes in shoot density, records of morphological changes in reproductive shoots subjected to increased nutrient availability are lacking. To address this, five replicate ambient and nutrient enriched patches, each between 0.5 and 2.0 m2, were selected within a developing Z. marina meadow in Shinnecock Bay, NY. Fertilizer stakes, with a N:P:K of 15:3:3, were used to amend enriched patches …

Go to article

Diversity Of Skates (Batoidea: Rajoidei) And The Spatial Structure Of Nw Atlantic Communities, Christopher Michael Martinez Dec 2014

Diversity Of Skates (Batoidea: Rajoidei) And The Spatial Structure Of Nw Atlantic Communities, Christopher Michael Martinez

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Trait diversity often underlies complexity observed in biological systems. Whether it is behavior, life history, form or function, variation imparts differential performance on the organism, which may influence processes at higher levels of organization. Using two approaches, my dissertation research concerns the appraisal of diversity in fishes and its consequences for their ecology and evolution. The first two chapters focus on variety of spatial behaviors in northwest Atlantic marine communities. Temporal changes in community habitat utilization, as quantified by the interspecific abundance-occupancy (A-O) relationship, were the focus of chapter one. Trends in the A-O relationship indicated large-scale reorganization in some …

Go to article

Does The Seasonal Acidification Of Spawning Habitat Influence Offspring Co2 Reaction Norms Through Transgenerational Plasticity In The Coastal Fish Species, Menidia Menidia?, Christopher S. Murray Dec 2014

Does The Seasonal Acidification Of Spawning Habitat Influence Offspring Co2 Reaction Norms Through Transgenerational Plasticity In The Coastal Fish Species, Menidia Menidia?, Christopher S. Murray

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Experimental assessments of species vulnerabilities to ocean acidification are rapidly expanding, yet the potential for short- and long-term adaptation to high CO2 by contemporary marine organisms remains poorly understood. We used a novel experimental approach that combined bi-weekly sampling of a wild, spawning fish population (Atlantic silverside, Menidia menidia) with standardized offspring CO2 exposure experiments and parallel pH monitoring of a coastal ecosystem. We assessed whether offspring produced at different times of the spawning season (April-July) would be similarly susceptible to elevated (~1,100 uatm, pHNBS = 7.77) and high CO2 levels (~2,300 uatm, pHNBS = 7.47). Early in the season …

Go to article

Impacts Of The Lobate Ctenophore Mnemiopsis Leidyi On Zooplankton Community Dynamics In The Long Island Sound, Ny, David Rawitz Dec 2014

Impacts Of The Lobate Ctenophore Mnemiopsis Leidyi On Zooplankton Community Dynamics In The Long Island Sound, Ny, David Rawitz

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

The impact of the lobate ctenophore, Mnemiopsis leidyi, on zooplankton community structure has been noted on a variety of ecosystems. This impact arises primarily through high predation rates on copepods. Eutrophication appears to enhance M. leidyi abundance through bottom-up effects. This study investigated the effects of an eutrophication gradient (west to east) on M. leidyi abundance, and the effects of M. leidyi predation on zooplankton populations in the Long Island Sound (LIS). Bi-weekly samples of zooplankton, microplankton, and M. leidyi were obtained from three distinct sites in the Central, Middle, and Western LIS across the eutrophication gradient in 2011 and …

Go to article

Molecular Characterization Of Quahog Parasite Unknown (Qpx), A Thraustochytird Pathogen Of The Hard Clam, Mercenaria Mercenaria, Ewelina Rubin Dec 2014

Molecular Characterization Of Quahog Parasite Unknown (Qpx), A Thraustochytird Pathogen Of The Hard Clam, Mercenaria Mercenaria, Ewelina Rubin

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

The hard clam or northern quahog, Mercenaria mercenaria, is one of the most valuable seafood products in the United States. Severe episodes of hard clam mortality have been consistently associated with infections caused by a thraustochytrid parasite called Quahog Parasite Unknown (QPX). Studies in the present dissertation examined the molecular bases of QPX virulence towards clams. Investigation of QPX transcriptome libraries generated a database of QPX putative virulence factors and other molecules potentially involved in interactions with the clam host. Multiple differential gene expression profiles were generated using oligoarray technology for QPX strains isolated from different geographic locations and for …

Go to article

Evaluation Of Wrf Planetary Boundary Layer Schemes Over The Coastal Waters Of Southern New England, Matthew Joseph Sienkiewicz Dec 2014

Evaluation Of Wrf Planetary Boundary Layer Schemes Over The Coastal Waters Of Southern New England, Matthew Joseph Sienkiewicz

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Winds, temperatures and moisture in the planetary boundary layer (PBL) are often difficult for operational models to predict given the relatively sparse observations and that most model PBL parameterizations were developed over inland locations. Coastal marine layer forecasts are important for the forecasting of severe storms and wind energy resources in the highly populated coastal marine environment of the Northeast U.S. (NEUS). Mesoscale models are known to have large biases in wind speeds and temperatures at these lower levels over coastal waters. The goal of this project is to evaluate the performance of six PBL schemes in the Weather Research …

Go to article

Microplastics In Long Island Marine Estuaries, Jessica Steve Dec 2014

Microplastics In Long Island Marine Estuaries, Jessica Steve

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

This study investigated the prevalence of microplastics in Shinnecock Bay and Jamaica Bay on Long Island in New York. Surface water samples were collected with a 200 μ m plankton tow net, filtered onto metal mesh screens, and examined under a dissecting microscope. A total of 517 microplastic particles were found in samples from Shinnecock Bay (0-0.58 particles m-3), and 1,005 particles were found in Jamaica Bay samples (0-3.93 particles m-3). Particles were visually sorted by size, color, and shape. Statistical analyses were performed to analyze microplastic particle diversity, evenness, and any spatial or temporal variation. Attempts to determine source …

Go to article

Nitrogen Loading To The South Shore, Eastern Bays, Ny: Sources, Impacts, And Management Options, Isabelle Stinnette Dec 2014

Nitrogen Loading To The South Shore, Eastern Bays, Ny: Sources, Impacts, And Management Options, Isabelle Stinnette

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

The excessive delivery of nitrogen from land into coastal waters can lead to a host of environmental problems including algal blooms, hypoxic zones, habitat loss, and acidification. While many of these environmental problems have manifested themselves within Long Island's coastal bays, the quantity and sources of nitrogen are largely unknown in much of this region, making the development of effective management plans to ameliorate these problems exceedingly difficult. This study was designed to quantify nitrogen loads and sources to Moriches, Quantuck and Shinnecock Bays within the eastern extent of Long Island's South Shore Estuary Reserve. Further this study assessed water …

Go to article

Multi-Armed Bandits With Applications To Markov Decision Processes And Scheduling Problems, Isa Mithqal Muqattash Dec 2014

Multi-Armed Bandits With Applications To Markov Decision Processes And Scheduling Problems, Isa Mithqal Muqattash

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

The focus of this work is on practical applications of stochastic multi-armed bandits (MABs) in two distinctive settings. First, we develop and present REGA, a novel adaptive sampling-based algorithm for control of finite-horizon Markov decision processes (MDPs) with very large state spaces and small action spaces. We apply a variant of the epsilon-greedy multi-armed bandit algorithm to each stage of the MDP in a recursive manner, thus computing an estimation of the " reward-to-go" value at each stage of the MDP. We provide a finite-time analysis of REGA. In particular, we provide a bound on the probability that the approximation …

Go to article

The Effect Of Patch Dynamics And Nutrient Availability On The Production Of Zostera Marina Seeds Within Shinnecock Bay, Ny, Lisa Jackson Dec 2014

The Effect Of Patch Dynamics And Nutrient Availability On The Production Of Zostera Marina Seeds Within Shinnecock Bay, Ny, Lisa Jackson

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Exposing Zostera marina to fertilized porewater has been shown to increase vegetative shoot density and leaf growth rates, as well as affect morphological shoot characteristics including increasing leaf length, leaf area and the number of leaves per shoot. However, aside from changes in shoot density, records of morphological changes in reproductive shoots subjected to increased nutrient availability are lacking. To address this, five replicate ambient and nutrient enriched patches, each between 0.5 and 2.0 m2, were selected within a developing Z. marina meadow in Shinnecock Bay, NY. Fertilizer stakes, with a N:P:K of 15:3:3, were used to amend enriched patches …

Go to article

The Influence Of Biogenic Opal On 231pa/230th In Sediments From The Bermuda Rise And Its Implication For Paleocirculation Reconstructions, Theresa Marie King Dec 2014

The Influence Of Biogenic Opal On 231pa/230th In Sediments From The Bermuda Rise And Its Implication For Paleocirculation Reconstructions, Theresa Marie King

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Thermohaline circulation is responsible for the global transport of heat in surface waters of the ocean, and variability in this circulation has been linked to both short- and long-term climate change on time scales ranging from centuries to tens of thousands of years. Accurate reconstructions of past variability are thus critical to understanding modern and future thermohaline circulation changes and the response of the global climate system. The main circulation feature in the Atlantic is Atlantic Meridional Overturning Circulation (AMOC), and has been reconstructed using a variety of static proxies, but more recently through the use of sedimentary 231Paxs …

Go to article

Diversity Of Skates (Batoidea: Rajoidei) And The Spatial Structure Of Nw Atlantic Communities, Christopher Michael Martinez Dec 2014

Diversity Of Skates (Batoidea: Rajoidei) And The Spatial Structure Of Nw Atlantic Communities, Christopher Michael Martinez

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Trait diversity often underlies complexity observed in biological systems. Whether it is behavior, life history, form or function, variation imparts differential performance on the organism, which may influence processes at higher levels of organization. Using two approaches, my dissertation research concerns the appraisal of diversity in fishes and its consequences for their ecology and evolution. The first two chapters focus on variety of spatial behaviors in northwest Atlantic marine communities. Temporal changes in community habitat utilization, as quantified by the interspecific abundance-occupancy (A-O) relationship, were the focus of chapter one. Trends in the A-O relationship indicated large-scale reorganization in some …

Go to article

Does The Seasonal Acidification Of Spawning Habitat Influence Offspring Co2 Reaction Norms Through Transgenerational Plasticity In The Coastal Fish Species, Menidia Menidia?, Christopher S. Murray Dec 2014

Does The Seasonal Acidification Of Spawning Habitat Influence Offspring Co2 Reaction Norms Through Transgenerational Plasticity In The Coastal Fish Species, Menidia Menidia?, Christopher S. Murray

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Experimental assessments of species vulnerabilities to ocean acidification are rapidly expanding, yet the potential for short- and long-term adaptation to high CO2 by contemporary marine organisms remains poorly understood. We used a novel experimental approach that combined bi-weekly sampling of a wild, spawning fish population (Atlantic silverside, Menidia menidia) with standardized offspring CO2 exposure experiments and parallel pH monitoring of a coastal ecosystem. We assessed whether offspring produced at different times of the spawning season (April-July) would be similarly susceptible to elevated (~1,100 uatm, pHNBS = 7.77) and high CO2 levels (~2,300 uatm, pHNBS = 7.47). Early in the season …

Go to article

Oceanic And Atmospheric Influences On The Interannual Variability Of The Madagascar Phytoplankton Bloom, Lindsay Roupe Dec 2014

Oceanic And Atmospheric Influences On The Interannual Variability Of The Madagascar Phytoplankton Bloom, Lindsay Roupe

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Approximately every other year during the austral summer a larger phytoplankton bloom propagates off of the southeast tip of Madagascar. The cause of the interannual variability of this distinct oceanic feature remains unclear, so here we improve the analysis of the interannual variability of the bloom with a longer ocean color dataset, re-examine the existing mixed layer depth and iron fertilization hypotheses formerly used to explain bloom formation and analyze the variability in the larger ocean-atmosphere system in the region in relation to bloom formation. To resolve the forcings on the bloom, relevant satellite and reanalysis data were examined using …

Go to article

Molecular Characterization Of Quahog Parasite Unknown (Qpx), A Thraustochytird Pathogen Of The Hard Clam, Mercenaria Mercenaria, Ewelina Rubin Dec 2014

Molecular Characterization Of Quahog Parasite Unknown (Qpx), A Thraustochytird Pathogen Of The Hard Clam, Mercenaria Mercenaria, Ewelina Rubin

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

The hard clam or northern quahog, Mercenaria mercenaria, is one of the most valuable seafood products in the United States. Severe episodes of hard clam mortality have been consistently associated with infections caused by a thraustochytrid parasite called Quahog Parasite Unknown (QPX). Studies in the present dissertation examined the molecular bases of QPX virulence towards clams. Investigation of QPX transcriptome libraries generated a database of QPX putative virulence factors and other molecules potentially involved in interactions with the clam host. Multiple differential gene expression profiles were generated using oligoarray technology for QPX strains isolated from different geographic locations and for …

Go to article

Evaluation Of Wrf Planetary Boundary Layer Schemes Over The Coastal Waters Of Southern New England, Matthew Joseph Sienkiewicz Dec 2014

Evaluation Of Wrf Planetary Boundary Layer Schemes Over The Coastal Waters Of Southern New England, Matthew Joseph Sienkiewicz

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Winds, temperatures and moisture in the planetary boundary layer (PBL) are often difficult for operational models to predict given the relatively sparse observations and that most model PBL parameterizations were developed over inland locations. Coastal marine layer forecasts are important for the forecasting of severe storms and wind energy resources in the highly populated coastal marine environment of the Northeast U.S. (NEUS). Mesoscale models are known to have large biases in wind speeds and temperatures at these lower levels over coastal waters. The goal of this project is to evaluate the performance of six PBL schemes in the Weather Research …

Go to article

Microplastics In Long Island Marine Estuaries, Jessica Steve Dec 2014

Microplastics In Long Island Marine Estuaries, Jessica Steve

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

This study investigated the prevalence of microplastics in Shinnecock Bay and Jamaica Bay on Long Island in New York. Surface water samples were collected with a 200 μ m plankton tow net, filtered onto metal mesh screens, and examined under a dissecting microscope. A total of 517 microplastic particles were found in samples from Shinnecock Bay (0-0.58 particles m-3), and 1,005 particles were found in Jamaica Bay samples (0-3.93 particles m-3). Particles were visually sorted by size, color, and shape. Statistical analyses were performed to analyze microplastic particle diversity, evenness, and any spatial or temporal variation. Attempts to determine source …

Go to article

First Prev Next Last