Digital Commons Network^™

The Fate Of Nitrogren Fixed By Diazotrophs In The Ocean, Margaret R. Mulholland

OES Faculty Publications

While we now know that N₂ fixation is a significant source of new nitrogen (N) in the marine environment, little is known about the fate of this N (and associated C), despite the importance of diazotrophs to global carbon and nutrient cycles. Specifically, does N fixed during N₂ fixation fuel autotrophic or heterotrophic growth and thus facilitate carbon (C) export from the euphotic zone, or does it contribute primarily to bacterial productivity and respiration in the euphotic zone? For Trichodesmium, the diazotroph we know the most about, the transfer of recently fixed N₂ (and C) appears …

Response Of Eelgrass Zostera Marina To Co2 Enrichment: Possible Impacts Of Climate Change And Potential For Remediation Of Coastal Habitats, Sherry L. Palacios, Richard C. Zimmerman

OES Faculty Publications

Projected increases in dissolved aqueous concentrations of carbon dioxide [CO_2(aq)] may have significant impacts on photosynthesis Of CO₂-limited organisms such as seagrasses. Short-term CO_2(aq) enrichment increases photosynthetic rates and reduces light requirements for growth and survival of individual eelgrass Zostera marina L. shoots growing in the laboratory under artificial light regimes for at least 45 d. This study examined the effects of long-term CO_2(aq) enrichment on the performance of eelgrass growing under natural light-replete (33% surface irradiance) and light-limited (5% surface irradiance) conditions for a period of 1 yr. Eelgrass shoots were grown at …

Simulations Of Phytoplankton Species And Carbon Production In The Equatorial Pacific Ocean 1. Model Configuration And Ecosystem Dynamics, Baris Salihoglu, Eileen E. Hofmann

OES Faculty Publications

The primary objective of this research is to investigate phytoplankton community response to variations in physical forcing and biological processes in the Cold Tongue region of the equatorial Pacific Ocean at 0N, 140W. This research objective was addressed using a one-dimensional multicomponent lower trophic level ecosystem model that includes detailed algal physiology, such as spectrally-dependent photosynthetic processes and iron limitation on algal growth. The ecosystem model is forced by a one-year (1992) time series of spectrally-dependent light, temperature, and water column mixing obtained from a Tropical Atmosphere-Ocean (TAO) Array mooring. Autotrophic growth is represented by five algal groups, which have …

Co2 Control Of Trichodesmium N-2 Fixation, Photosynthesis, Growth Rates, And Elemental Ratios: Implications For Past, Present, And Future Ocean Biogeochemistry, D. A. Hutchins, F.-X. Fu, Y. Zhang, M. E. Warner, Y. Feng, K. Portune, P. W. Bernhardt, M. R. Mulholland

OES Faculty Publications

Diazotrophic marine cyanobacteria in the genus Trichodesmium contribute a large fraction of the new nitrogen entering the oligotrophic oceans, but little is known about how they respond to shifts in global change variables such as carbon dioxide (CO₂) and temperature. We compared Trichodesmium dinitrogen (N₂) and CO₂ fixation rates during steady-state growth under past, current, and future CO₂ scenarios, and at two relevant temperatures. At projected CO₂ levels of year 2100 (76 Pa, 750 ppm), N₂ fixation rates of Pacific and Atlantic isolates increased 35-100%, and CO₂ fixation rates increased 15-128% …

Light Environment And Seasonal Dynamics Of Microalgae In The Annual Sea Ice At Terra Nova Bay, Ross Sea, Antarctica, L. Lazzara, I. Nardello, C. Ermanni, O. Mangoni, V. Saggiomo

OES Faculty Publications

We investigated the physical conditions of the Spring pack ice environment at Terra Nova Bay to understand their influence on the structure and physiology of sympagic microalgae. Bio-optical methods were used to study the availability and spectral quality of solar radiation, both inside and underneath the ice cover. Pack ice thickness was around 2.5 m, with a temperature between -2 and -7°C. On average, only 1.4% of surface PAR penetrated to the bottom ice and less than 0.6% below platelet ice level. Surface UV-B radiation under the bottom ice was 0.2-0.4%. Biomass concentrations up to 2400 mg Chl a m- …

Otolith Chemistry Reflects Frontal Systems In The Antarctic Circumpolar Current, J. R. Ashford, A. I. Arkhipkin, C. M. Jones

OES Faculty Publications

Pronounced environmental trends across fronts suggest that the otolith chemistry of oceanic fish can resolve zones on either side, promoting application to population questions at similar spatial scales. Trace and minor elements laid down immediately prior to capture - along the edges of otoliths from Patagonian toothfish Dissostichus eleginoides - discriminated frontal zones in the Antarctic Circumpolar Current in the Southwestern Atlantic Ocean. Mean values differentiated sampling areas by up to 2.6 standard deviations, suggesting: (1) otolith Mg/Ca enrichment related to fish activity around the Burdwood Bank; (2) Mn/Ca enrichment associated with South America; (3) Sr/Ca linked to the presence …

Impact Of Anthropogenic Combustion Emissions On The Fractional Solubility Of Aeroosol Iron: Evidence From The Sargasso Sea, Peter N. Sedwick, Edward R. Sholkovitz, Thomas M. Church

OES Faculty Publications

We report empirical estimates of the fractional solubility of aerosol iron over the Sargasso Sea during periods characterized by high concentrations of Saharan dust (summer 2003) and by low concentrations of aerosols in North American/maritime North Atlantic air masses (spring 2004 and early summer 2004). We observed a strong inverse relationship between the operational solubility of aerosol iron (defined using a flow-through deionized-water leaching protocol) and the total concentration of aerosol iron, whereby the operational solubility of aerosol iron was elevated when total aerosol iron loadings were low. This relationship is consistent with source-dependent differences in the solubility characteristics of …

Grazing Impacts Of Diverse Zooplankton Taxa On Thin Layers, Alexander Bochdansky

OES Faculty Publications

The US Navy needs to know how distributions and abundances of light-scattering and sound-scattering organisms in the ocean vary in space and time, particularly in the vertical dimension. Recent field observations have shown that many biological properties may vary substantially over small e.g. centimeter scales, commonly referred to as thin layers e.g. Cowles et al. 1998, 1999, Hanson Donaghay 1998, Holliday et al. 1999, Dekshenieks et al. 2001, Alldredge et al. 2002, Rines et al. 2002. Our previous ONR-funded research has allowed us to begin to understand how zooplankton interact with thin layers and how they can take advantage of …

Application Of Maldis-Ms To Identification Of Phytoplankton In Ballast Water, Dana Woodruff, Karen L. Wahl, Nancy B. Valentine, Fred Dobbs

OES Faculty Publications

Non-native invasive species are increasingly evident in marine and estuarine environments, largely because of the intake and release of ballast water from sea vessels. Innovative methods are needed to quickly and accurately detect and speciate non-native and/or harmful phytoplankton in ballast water. Recent advances in ionization techniques such as matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) have allowed detection of intact biomolecules within ballast samples. Statistically-based algorithms are used to discern "fingerprints" of phytoplankton species and to discern individual species from mixtures. MALDI-MS is particularly attractive for field applications because of the speed of analysis, minimal liquids/consumables required, and femtomole (10-15) …

On Rhetoric As Gift/Giving, Mari Lee Mifsud

Rhetoric and Communication Studies Faculty Publications

In this essay, I explore the possibilities of rhetoric as gift. I begin with the Homeric gift economy and the rhetorical resources of this economy. My use of "economy" here is not reducible to a monetary exchange system, but rather a more general system of practices orchestrating cultural identity and relations. As Georges Bataille suggests, studying a general economy may hold the key to all the problems posed by every discipline (1991, 10). For Bataille everything from geophysics to political economy, by way of sociology, history and biology, to psychology, philosophy, art, literature, and poetry has an essential connection with …

Preparation Of Bioactive Glasses With Controllable Degradation Behavior And Their Bioactive Characterization, Aihua Yao, Deping Wang, Qiang Fu, M. N. Rahaman, Wen-Hai Huang

Materials Science and Engineering Faculty Research & Creative Works

Bioactive glasses and ceramics have been widely investigated for bone repair because of their excel-lent bioactive characteristics. However, these biomaterials undergo incomplete conversion into a bone-like material, which severely limits their biomedical application. In this paper, borosilicate bioac-tive glasses were prepared by traditional melting process. The results showed that borosilicate glasses possessed high biocompatibility and bioactivity. In addition, when immersed in a 0.02 mol/L K2HPO4 solution, particles of a borate glass were fully converted to HA. The desirable conversion rate to HA may be achieved through the adjustment of the B2O3/SiO2 ratio. The results of XRD and FTIR analysis indicated …

Physicochemical Properties Of Individual And Mixed Oxides Of Sio2, Al203, Tio2‚ And Photocatalytic Behaviour Of Organosilane Modified St Samples, Kalyani Gude

Masters Theses

A variety of oxides such as silica, alumina, titania and mixed oxides such as silica/alumina (SA), silica/titania (ST) and alumina/silica/titania (AST) are investigated by TGA and FTIR. These mixed oxides are analyzed because of their applications as catalysts. Thermogravimetric analysis is done on all the samples to determine the temperature at which the weakly adsorbed water is lost and the surface is left with only surface hydroxyls. TGA data showed the loss of most of the adsorbed water at around 100°C.

From the diffuse reflectance FTIR spectra taken at 200 and 300°C the silanol content is estimated from the 3740 …

Fathers' And Young Sons' Everyday Talk: A Conversation Analytic Study Of Topic Initiation And Development, Stacia Jayne Ozier

Masters Theses

As Floyd and Morman (1999) argue, "there are few male-male relationships that may be more socially significant than that between father and son"(p. 310). This study is an introduction to the exploration of topic in father-young son interaction. Using the method of conversation analysis we have identified how three father-young son groups initiate topic in actual everyday conversation. Both fathers and sons used aspects of the physical environment and social activities as resources for topic initiation. In addition, one father used other-focused questions to initiate topics with his young sons. In the examination of the practices used by the fathers …

Presenting Problems And Treatment Outcome Of College Counseling Center Clients: The Role Of Gender And Academic Major, Erik Lennart Timothy Fister

Masters Theses

The current study examined whether gender and/or academic specialization had any relationship to students presenting issues, symptom severity, and treatment outcome at a university counseling center. The participants were 484 clients and the data were collected at an East Coast university counseling center. Clients were included for the analyses if they were a new intake, clearly fit into one of six categories for academic major, and attended more than one session. Each client filled out both the Personal Information Form (PIF) and Behavioral Health Questionnaire (BHQ) at intake, and was administered the BHQ prior to each subsequent session. Based on …

Science And Application: A Comparison Of Graduate Training In Counseling And Clinical Psychology, Nupur Jain

Masters Theses

Often times, when considering training and careers in psychology, students have difficulty deciding whether to pursue clinical psychology or counseling psychology as a career. The decision made might be a result of limited or biased information. Additionally, students often fail to make important distinctions between counseling psychology and the professional field of counseling, which has implications for the career path they pursue. The purpose of the current literature review is to provide readers with the range of knowledge and ideas, including contrasting perspectives and viewpoints that have been established in this area.

Students also often fail to make important distinctions …

The Philosophical Quest Of Tom Joad In The Grapes Of Wrath, Eun-Young Lim

Masters Theses

When the merciless Dust Bowl sweeps through Oklahoma in The Grapes of Wrath, the major questions of what can be achieved by thinking and how can ordinary men overcome these critical circumstances pervade the entire novel. This thesis focuses on how Tom Joad, the protagonist in this novel, grows in his philosophical quest, based mainly on Steinbeck's assertion that "Need is the stimulus to concept, concept to action."

Although Tom Joad is portrayed as a cynical, convicted killer who responds to stimuli or from impulse at first, he undergoes his journey both literally and metaphorically from Oklahoma to the promised …

The Influence Of Physical Activity, Eating Habits, And Social Physique Anxiety On Obesity In Adolescent Females, Rachel Marie Hardesty

Masters Theses

Childhood obesity is becoming a more serious problem as time goes by. A large part of the problem is adolescent children are less active, have poor eating habits, and have negative feelings regarding their body shape. PURPOSE: In order to identify those factors most closely associated with obesity. This study compared the eating patterns, activity patterns, and social physique anxiety in non-obese to over weight and obese adolescent females. Also, this study investigated the relationships between eating patterns, activity patterns, and social physique anxiety to body mass index in adolescent females in order to identify those factors most closely associated …

Gateway Program: Perceptions Of The Second Year Student, Makesha Harris

Masters Theses

This study was designed to understand the perception of sophomore students who were successfully released from the Gateway Program and are now progressing through their college careers at Eastern Illinois University. They are doing so without the extra resources and intrusive assistance of first year Gateway advisors and support services during their sophomore year. The primary investigator conducted one on one interviews with a selected sample of former Gateway students using qualitative methods (Lincoln & Guba 1985) regarding their relationship with their Gateway advisor and their second year academic advisor and campus resources. Interview findings were triangulated and themes and …

Existential Anxiety And Religious Commitment, Daniel J. Pelak

Masters Theses

The purpose of this study was to examine the relationship between Paul Tillich's theory of existential anxiety and religious commitment. The study attempted to determine if there was type of existential anxiety that religion might perpetuate or alleviate. Two hundred and twenty-nine individuals who endorsed a Christian or Catholic belief system completed a series of surveys on an internet website; participants were recruited through various Christian message boards or a standardized email that was sent to various church leaders; the measures of the assessment were Tillich's theory of existential anxiety, death anxiety, moral anxiety, meaninglessness anxiety, religious commitment, and personality …

Spatial And Temporal Distribution Of Total Heterotroph And Fecal Coliform Bacteria In An Urban Stream, Heather R. English

Masters Theses

Total heterotroph bacteria populations in the Sangamon River in east central Illinois, U.S.A. were monitored during a period between June and October in 2003 and 2004. Fecal coliforms (FC) were also monitored during this period in 2004. The four sites monitored were upstream and downstream of the Sanitary District of Decatur (SOD). All areas ofthe river monitored showed similar populations ofboth total heterotrophs and FCs. No correlations could be made between increases in populations of total heterotrophs or FC in relation to flow rate, dissolved oxygen, or total solids. Most sites were found to exceed the recommended amount ofFC for …

Long Term Population Dynamics For Rosa Multiflora In A Successional System, Stephen Eugene Banasiak

Masters Theses

There is a real need for long term studies of invasions to develop a more complete understanding of the factors that influence species spread. Rosa multiflora was chosen to study to address this issue due to its pervasiveness throughout the study site's successional history. The study-site was composed of 10 abandoned agricultural fields near an old growth forest with fifty years of annual vegetation data collection. R. multiflora colonization and extinction rates were examined along with frequency and coefficient of variance since field abandonment. Environmental factors such as rainfall, tree cover, and common species and their effects on R. multiflora …

The Influence Of Extreme Hydrologic Events On Benthic Macroinvertebrate Assemblages In The Sangamon River, Decatur, Illinois, Catherine E. Ciak

Masters Theses

One of the most extreme disturbances to aquatic systems is river impoundment. Dams alter a river's ecological processes by changing the flow of water, nutrients, sediment, biota and energy. Anthropogenic flow variability can lead to changes in natural seasonal variation, which has subsequent effects on biological assemblages within the ecosystem. This study investigated the influence of extreme hydrologic events on benthic macroinvertebrate assemblages within the Sangamon River in Decatur, Illinois. Four sites were sampled from June-August 2006 using the EPA 20 jab method. Samples were processed and macroinvertebrates were identified to family or lowest identifiable taxonomic group. Primer 6.1.6 was …

Zinc(Ii) Incorporation Into Porphyrin Cytochrome C As A Function Of Temperature, Urea Concentration And Zinc(Ii) Acetate Concentration And The Urea And Guanidine Hydrochloride Induced Unfolding Of Porphyrin Cytochrome C, Sireesha Potula

Masters Theses

The objective of this thesis is to address the question of whether the removal of the native iron(II) ion in cytochrome c (cyt c) and substitution by a different metal ion affects the overall structural stability. We have studied the incorporation of zinc(II) into metal-free porphyrin cytochrome с (H2cyt) and investigated the structural stability of cyt c in the absence of the iron(II) ion and in the presence of the zinc(II) ion by different spectroscopic techniques. Compared to H2cyt, zinc-substituted cytochrome c (Zncyt) has a significantly different absorbance spectrum, so we monitor over time the change in absorbance upon addition …

Metal-Substituted Cytochrome C: Manganese (Ii) Incorporation Kinetics And Structural Stability Studies Of Native Iron Cytochrome C, Porphyrin Cytochrome C, Zinc Cytochrome C And Manganese Cytochrome C, Vineela Gundala

Masters Theses

Metalloproteins have the capacity to bind various metal ions. In spite of this seemingly diverse choice of cofactors, metalloproteins generally bind only their cognate metal in vivo. Cytochrome c (cyt c) binds Fe porphyrin in vivo. The main objective of this thesis is to investigate why nature selects Fe porphyrin as the prosthetic group in heme proteins and how removal of the native Fe in cyt c and substitution by different metal ions affects the local coordination environment, overall structural stability, and biological function. Our goal is to prepare and characterize metal-free cytochrome c, socalled porphyrin cytochrome c (H2cyt), and …

Maptogenome: A Comparative Genomic Tool That Aligns Transcript Maps To Sequenced Genomes, Srikrishna Putta, Jeramiah J. Smith, Chuck Staben, S. Randal Voss

Biology Faculty Publications

Efforts to generate whole genome assemblies and dense genetic maps have provided a wealth of gene positional information for several vertebrate species. Comparing the relative location of orthologous genes among these genomes provides perspective on genome evolution and can aid in translating genetic information between distantly related organisms. However, large-scale comparisons between genetic maps and genome assemblies can prove challenging because genetic markers are commonly derived from transcribed sequences that are incompletely and variably annotated. We developed the program MapToGenome as a tool for comparing transcript maps and genome assemblies. MapToGenome processes sequence alignments between mapped transcripts and whole genome …

2007 Commencement Program, Seattle University

Commencement Programs

No abstract provided.

Exploring The Vast Diversity Of Marine Viruses, Mya Breitbart, Luke Thompson, Curtis Suttle, Matthew Sullivan

Marine Science Faculty Publications

No abstract provided.

Visionary 2007, College Of Optometry

Visionary

No abstract provided.

The Act Requirement As A Basic Concept Of Criminal Law, Luis E. Chiesa

Elisabeth Haub School of Law Faculty Publications

No abstract provided.

The Embodiment Of Equal Justice Under The Law, Anita F. Hill

Nova Law Review

No abstract provided.