Digital Commons Network^™

The Assembly Of Ecological Communities Inferred From Taxonomic And Functional Composition, Eric R. Sokol, E. F. Benfield, Lisa K. Belden, H. Maurice Valett

Biological Sciences Faculty Publications

Among-site variation in metacommunities (beta diversity) is typically correlated with the distance separating the sites (spatial lag). This distance decay in similarity pattern has been linked to both niche-based and dispersal-based community assembly hypotheses. Here we show that beta diversity patterns in community composition, when supplemented with functional-trait information, can be used to diagnose assembly processes. First, using simulated data, we show how the relationship between distance decay patterns in taxonomic and functional measures of community composition can be used to predict the influence of a given trait on community assembly. We then use the patterns generated by the simulation …

Thinking Outside The Channel: Modeling Nitrogen Cycling In Networked River Ecosystems, Ashley M. Helton, Geoffrey C. Poole, Judy L. Meyer, Wilfred M. Wollheim, Bruce J. Peterson, Patrick J. Mulholland, Emily S. Bernhardt, Jack Arthur Stanford, Clay Arango, Linda R. Ashkenas, Lee W. Cooper, Walter K. Dodds, Stanley V. Gregory, Robert O. Hall Jr., Stephen K. Hamilton, Sherri L. Johnson, William H. Mcdowell, Jody D. Potter, Jennifer L. Tank, Suzanne M. Thomas, H. Maurice Valett, Jackson R. Webster, Lydia Zeglin

Biological Sciences Faculty Publications

Agricultural and urban development alters nitrogen and other biogeochemical cycles in rivers worldwide. Because such biogeochemical processes cannot be measured empirically across whole river networks, simulation models are critical tools for understanding river-network biogeochemistry. However, limitations inherent in current models restrict our ability to simulate biogeochemical dynamics among diverse river networks. We illustrate these limitations using a river-network model to scale up in situ measures of nitrogen cycling in eight catchments spanning various geophysical and land-use conditions. Our model results provide evidence that catchment characteristics typically excluded from models may control river-network biogeochemistry. Based on our findings, we identify important …

Effects Of Soil Biota From Different Ranges On Robinia Invasion: Acquiring Mutualists And Escaping Pathogens, Ragan M. Callaway, Eulogio J. Bedmar, Kurt O. Reinhart, Cinta Gómez Silvan, John Klironomos

Biological Sciences Faculty Publications

The net effects of soil biota on exotic invaders can be variable, in part, because net effects are produced by many interacting mutualists and antagonists. Here we compared mutualistic and antagonistic biota in soils collected in the native, expanded, and invasive range of the black locust tree, Robinia pseudoacacia. Robinia formed nodules in all soils with a broad phylogenetic range of N-fixing bacteria, and leaf N did not differ among the different sources of soil. This suggests that the global expansion of Robinia was not limited by the lack of appropriate mutualistic N-fixers. Arbuscular mycorrhizal fungi (AMF) from the …

Ocular Pathology Relevant To Glaucoma In A Gja1(Jrt) Mouse Model Of Human Oculodentodigital Dysplasia, Edmund Tsui, Kathleen A. Hill, Alex M. Laliberte, Daniel Paluzzi, Ilia Kisilevksy, Qing Shao, Godfrey J. Heathcote, Dale W. Laird, Gerald M. Kidder, Cindy M. L. Hutnik

Anatomy and Cell Biology Publications

PURPOSE. Oculodentodigital dysplasia (ODDD) is a human disorder caused by mutations in the gap junction alpha 1 (GJA1) gene encoding the connexin43 (Cx43) gap junction protein. Causal links between GJA1 mutations and glaucoma are not understood. The purpose in this study was to examine the ocular phenotype for Gja1(Jrt/+) mice harboring a Cx43 G60S mutation. METHODS. In young Gja1(Jrt/+) mice, Cx43 abundance was assessed with a Western blot, and Cx43 localization was visualized using immunohistochemistry and confocal microscopy. Intraocular pressure (IOP) was measured by rebound tonometry, and eye anatomy was imaged using ocular coherence tomography (OCT). Hematoxylin and eosin (H&E)-stained …

Deletion Of Glycogen Synthase Kinase-3Β In Cartilage Results In Up-Regulation Of Glycogen Synthase Kinase-3Α Protein Expression, J. R. Gillespie, V. Ulici, H. Dupuis, A. Higgs, A. Dimattia, S. Patel, J. R. Woodgett, Frank Beier

Paediatrics Publications

The rate of endochondral bone growth determines final height in humans and is tightly controlled. Glycogen synthase kinase-3 (GSK-3) is a negative regulator of several signaling pathways that govern bone growth, such as insulin/IGF and Wnt/β-catenin. The two GSK-3 proteins, GSK-3 and GSK-3β, display both overlapping and distinct roles in different tissues. Here we show that pharmacological inhibition of GSK-3 signaling in a mouse tibia organ culture system results in enhanced bone growth, accompanied by increased proliferation of growth plate chondrocytes and faster turnover of hypertrophic cartilage to bone. GSK-3 inhibition rescues some, but not all, effects of phosphatidylinositide 3-kinase …

University Magazine Spring 2011, University News Service, Office Of Alumni Relations

University Publications

This is the official magazine for RIT Alumni. Issued thrice a year in spring, fall and winter. Printing began in 1999.

The Effect Of Dopamine Therapy On Ventral And Dorsal Striatum-Mediated Cognition In Parkinson's Disease: Support From Functional Mri., Penny A Macdonald, Alex A Macdonald, Ken N Seergobin, Ruzbeh Tamjeedi, Hooman Ganjavi, Jean-Sebastien Provost, Oury Monchi

Brain and Mind Institute Researchers' Publications

The central aim of our study was to elucidate functions mediated by the ventral and dorsal striatum, respectively, to better understand the cognitive effects of dopamine replacement in Parkinson's disease. We proposed that the ventral striatum underlies general learning of stimulus associations, whereas the dorsal striatum promotes integration of various influences on selecting. In Parkinson's disease, dopamine depletion is substantially less notable in the ventral relative to the dorsal striatum, and therefore greater improvements are expected for dorsal striatum-mediated functions with dopamine replacement. Using a simple selection task, we found that dopamine replacement impaired encoding and facilitation of consistent stimulus-stimulus …

Analytic And Numerical Studies Of A Simple Model Of Attractive-Repulsive Swarms, Andrew S. Ronan

HMC Senior Theses

We study the equilibrium solutions of an integrodifferential equation used to model one-dimensional biological swarms. We assume that the motion of the swarm is governed by pairwise interactions, or a convolution in the continuous setting, and derive a continuous model from conservation laws. The steady-state solution found for the model is compactly supported and is shown to be an attractive equilibrium solution via linear perturbation theory. Numerical simulations support that the steady-state solution is attractive for all initial swarm distributions. Some initial results for the model in higher dimensions are also presented.

Sagestep News, Spring 2011, No. 15, Sagestep

Newsletters

Seasonal newsletter of SageSTEP.

Nonamphiphilic Modification Of The Self-Assembly Behavior Of Surfactants And The Potential For Bolaamphiphile-Based Vesicle Formation In The Presence Of 5’Disodium Cromoglycate, Nemal S. Gobalasingham

Renée Crown University Honors Thesis Projects - All

Emulsion systems stabilized by surfactants have historically been driven by the separation of hydrophobic oils from water, essentially creating surfactant micelles. As surfactant molecules aggregate around the oil, they self-assemble in such a way that the hydrophobic chains of the surfactants face inward toward the oil while the hydrophilic, or water-loving, “head” of the surfactant face outward toward the water medium. The emergence of water-in-water emulsions consisting of droplets of a water-solvated biocompatible liquid crystals, disodium cromoglycate (5’DSCG), with polymers has unlocked the potential for modifying the self-assembly behavior of surfactants. We report here on the capacity of 5’DSCG to …

Spatio-Temporal Analysis Of Malaria In Paraguay, Nicole M. Wayant

Department of Geography: Dissertations, Theses, and Student Research

Malaria is a mosquito-borne disease that has afflicted humans for thousands of years. Today it is considered a re-emerging disease. Malaria is most prevalent in tropical and subtropical parts of the world. The disease has been linked to several environmental parameters, including precipitation, temperature, and deforestation. However, these relationships have mainly been studied in Africa and have not been explored in other parts of the world. The study area for this thesis was the South American country of Paraguay.

Paraguay has experienced an oscillation in malaria cases over the past 20 years, with monthly cases ranging from 0 to 1,200. …

Running In Absentia, Jeffrey David Tucker

Dissertations

Running in Absentia is a collection of short fiction, short-short fiction (also known as flash fiction), and poetry, with a critical introduction.

Breeding Migrations, Survivorship, And Obligate Crayfish Burrow Use By Adult Crawfish Frogs (Lithobates Areolatus), Jennifer L. Heemeyer

All-Inclusive List of Electronic Theses and Dissertations

Movements are risky behaviors to animals, and amphibians are no exception. Being unable to cover long distances quickly, amphibians may find migrations challenging, yet many if not most species exhibit cyclic annual migrations. Crawfish Frogs (Lithobates areolatus), are a relatively understudied species of North American amphibian listed as endangered in Indiana and Iowa, and considered a species of conservation concern throughout much of their range. To better understand the biology of this species, and in particular, to assess the role that movements play in affecting survivorship, I radio tracked 48 Crawfish Frog adults, in 2009 and 2010. My study encompassed …

The Influence And Legacy Of Deism In Eighteenth Century America, Tiffany E. Piland

Master of Liberal Studies Theses

This thesis project, The Influence and Legacy of Deism in Eighteenth Century America, examines deism’s impact as a theological system on American life and culture in the eighteenth century. Beginning with a basic definition of the term deism, a historical background is included. Next, the work of Galileo, Bacon, Newton, and Locke is examined for its impact on eighteenth century thought as well as early deist writers such as John Toland, Matthew Tindal, and Lord Herbert of Cherbury.

Moving onto America in the eighteenth century, colonial newspaper articles, letters, and other documents are examined that contain references to deism. Colleges …

Fate And Transport Of Escherichia Coli Within Sediment Basins On Active Construction Sites, Elizabeth Tempel

All Theses

The conventional method of controlling sediment-laden runoff on construction sites is the use of sediment basins. These basins slow the velocity of runoff and allow the particles to settle from the water column before discharge to surface waters offsite. This best management practice, however, may create a reservoir for pathogenic bacteria. Sediment is known to provide protection for bacteria; therefore, while these basins decrease sediment loadings to water bodies downstream, they may introduce harmful levels of pathogenic bacteria into these surface waters. In addition to causing human health risks, these high bacteria levels alter natural biological makeup of downstream ecosystems. …

Operator Splitting Method And Applications For Semilinear Parabolic Partial Differential Equations, R. Corban Harwood

Faculty Publications - Department of Mathematics

This dissertation presents a redefined operator splitting method used in solving semilinear parabolic partial differential equations. As one such form, the reaction-diffusion equation is highly prevalent in mathematical modeling. Besides being physically meaningful as a separation of two distinct physical processes in this equation, operator splitting simplifies the solution method in several ways. The super-linear speed-up of computations is a rewarding simplification as it presents great benefits for large-scale systems. In solving these semilinear equations, we will develop a condition for oscillation-free methods, a condition independent of the usual stability condition. This numerical consideration is important to fully embody our …

Adobe Medicus 2011 3 May-June, Health Sciences Library And Informatics Center

adobe medicus

No abstract provided.

A Planning Framework For African American Heirs' Property In Rapidly Suburbanizing Locales, Alison Rowland

All Theses

Heirs' property resulted from post-Civil War land acquisitions and purchases by African Americans that have been passed down through generations without clear title of ownership or a last will of testament (Mitchell, 2000; Dyer, 2008). As the surrounding landscape develops, growth pressures threaten community integrity and increase property taxes, making it difficult to retain properties (Rivers, 2007b). Encroaching development fails to maintain the cultural context of existing settlement patterns of heirs' properties as well as fails to integrate them into the surrounding landscape (Cross, 2008; Johnson, et al., 2009). The literature has been decidedly silent in addressing the strategies that …

Rapid Wetland Expansion During European Settlement And Its Implication For Marsh Survival Under Modern Sediment Delivery Rates, Matthew L. Kirwan, A. Brad Murray, Jeffrey P. Donnelly, D. Reide Corbett

United States Geological Survey: Staff Publications

Fluctuations in sea-level rise rates are thought to dominate the formation and evolution of coastal wetlands. Here we demonstrate a contrasting scenario in which land-use–related changes in sediment delivery rates drive the formation of expansive marshland, and vegetation feedbacks maintain their morphology despite recent sediment supply reduction. Stratigraphic analysis and radiocarbon dating in the Plum Island Estuary (Massachusetts, United States) suggest that salt marshes expanded rapidly during the eighteenth and nineteenth centuries due to increased rates of sediment delivery following deforestation associated with European settlement. Numerical modeling coupled with the stratigraphic observations suggests that existing marshland could survive, but not …

Inform Form Perform, Nathaniel Holland

Architecture Masters of Science Program: Theses

Architecture as a profession has always concerned itself with finding beauty in built forms. In the digital age beauty is changing; information controls our lives and true beauty is found in the way we interpret it. Architects have developed and employed parametric design strategies to both interpret this information and increase their production. Though these strategies have improved architectural design, they are not being used to their full extent in the design process. I propose taking the use of computers in aiding architectural design one step further; site information and program data should INFORM the project, driving the creation of …

Modular Inheritance Of Color Pattern In Lake Malawi Cichlid Fishes, Jennifer Roscoe

Renée Crown University Honors Thesis Projects - All

This study attempts to elucidate the mechanisms that underlie the evolution of pigmentation patterns among Lake Malawi cichlids. For decades researchers have sought to provide a theoretical model of cichlid speciation based on the evolution of male nuptial patterns and female preferences, yet our understanding of how color patterns change is limited. Here, we performed exploratory statistical analyses on an F₂ hybrid population to characterize the inheritance of color traits. Specifically, we sought to uncover patterns of modularity and levels of integration among color traits. Because cichlids are sexually dimorphic we did our analyses on males and females separately. …

Templeton High School - Teacher Internship Program, Erin Thompson

Agricultural Education: Graduate Internship Reports

This internship report addresses documentation required per quality criteria in secondary programs of agricultural education in California. The internship also included the development of instructional materials for a course now recognized as a UC/CSU approved Agriculture Biology course.

Assessing The Stability, Biological Transfer And Developmental Impact Of Environmentally Relevant Nitrosamines Using A Chicken Egg Model, Nikita Joshi

Environmental Health, Occupational Health, and Toxicology: Dissertations and Student Research

Nitrosamines comprise a large group of potentially toxic compounds occurring in the environment as by-products of various manufacturing, agricultural and natural processes. Nitrosamines are produced from reaction of nitrite with a suitable secondary amine in an acidic matrix; these acidic conditions can occur in environmental media and in the mammalian gastrointestinal (GI) tract. This research focused on the stability, transfer, and impacts of the environmentally relevant nitrosamines, N-nitrosodimethylamine (NDMA), N-nitrosmorpholine (NMOR), and N-nitrosoatrazine (NNAT) (formed from reaction of nitrite with dimethylamine, morpholine, and atrazine), using the chicken egg and embryo model systems. Chicken eggs were used to …

Ultrasonic Methods For The Characterization Of Complex Materials And Material Systems: Polymers, Structured Polymers, Soft Tissue And Bone, Charles Landais

Department of Engineering Mechanics: Dissertations, Theses, and Student Research

Understanding the characteristics and structure of materials is of importance in proper modeling and effective design of many products. Complex materials such as polymers, structured material systems, or biological materials provide a particular challenge to many of the traditional methods for doing this. In this dissertation I study the use of ultrasonic wave techniques to characterize several complex materials. These include plastically deformed and aged polycarbonate (PC), a structured PC plate with water filled cavities, bovine bone, and an elastomer used as a skin simulant. In each case, this work was part of a larger project that studied different aspects …

In Silico And In Vitro Investigations Of The Mutability Of Disease-Causing Missense Mutation Sites In Spermine Synthase, Zhe Zhang, Joy Norris, Charles Schwartz, Emil Alexov

Publications

Background

Spermine synthase (SMS) is a key enzyme controlling the concentration of spermidine and spermine in the cell. The importance of SMS is manifested by the fact that single missense mutations were found to cause Snyder-Robinson Syndrome (SRS). At the same time, currently there are no non-synonymous single nucleoside polymorphisms, nsSNPs (harmless mutations), found in SMS, which may imply that the SMS does not tolerate amino acid substitutions, i.e. is not mutable.

Methodology/Principal Findings

To investigate the mutability of the SMS, we carried out in silico analysis and in vitro experiments of the effects of amino acid substitutions at the …

Ntid Focus Spring/Summer 2011, Ntid Marketing And Communications

National Technical Institute for the Deaf Papers

No abstract provided.

Visitor Hand-Washing Compliance According To Policies And Procedures At A Regional Neonatal Intensive Care Unit., Desiree Raynor

Undergraduate Honors Theses

Hospital-acquired infections cost hospitals approximately $30.5 billion per year and also result in longer hospital stays, chronic conditions, and even death with associated malpractice costs. According to the Centers for Disease Control and Prevention, hand hygiene is a simple, effective way to prevent illness and infection. The purpose of this research was to determine if visitors to a neonatal intensive care unit (NICU) in a regional medical center comply with hand-washing policies and procedures. If NICU visitors wash their hands properly, they can prevent potentially fatal infections from spreading to patients, healthcare workers, and unaffected family members. Hand-washing compliance has …

Utah State University Commencement, 2011 – Main Campus, Utah State University

Commencement Programs

124^th Annual Commencement of Utah State University.

Constructive Noncooperation: Living In Truth, Mark A. Mattaini, Kristen Atkinson

Peace and Conflict Studies

Mohandas Gandhi often indicated that nonviolence was “a science,” and he appears to have meant this literally. Consistent with this vision, in this paper, we outline and apply principles of behavioral systems science, an emerging data-based approach to understanding the dynamics of complex cultural systems, to the practice of constructive noncooperation (Gandhi’s “constructive programme”). Although Gandhi emphasized that constructive action was the most important and potent of nonviolent strategic options, constructive alternatives have been the least developed in the literature of nonviolent struggle. The reconceptualization of constructive noncooperation in behavioral systems terms offered here suggests that rigorous analysis of Havel’s …

What's Happening: May, 2011, Maine Medical Center

What's Happening

No abstract provided.