Digital Commons Network^™

Associations Between Cognitive Scripts Of Insecure And Anomalous Attachment And Psychopathology Symptoms In A Normative-Risk Community Sample, Andrea “Andie” Youniss M.S.

Selected Full Text Dissertations, 2011-

Adult insecure and disorganized attachment representations have been shown to be consistently associated with internalizing and externalizing symptoms in adulthood. A recently validated coding system (Groh & Haydon, 2024) was developed to assess insecure (i.e., deactivating and hyperactivating) and disorganized (i.e., anomalous) scripted attachment representations via the Attachment Script Assessment (ASA; Waters & Waters, 2006) – a word prompt task traditionally designed to assess secure base script knowledge. Deactivating scripts reflect minimized or ignored attachment-relevant problems; hyperactivating scripts entail exacerbated attachment-relevant issues; and scripts with anomalous content contain disorganized or contradictory attachment-relevant concerns that shape how caregiving interactions are expected …

Culturally Responsive Dialectical Behavior Therapy With Chinese Sexual And Gender Minority Individuals: A Qualitative Study, Weiyi Liao M.S.

Selected Full Text Dissertations, 2011-

Professional guidelines emphasize the importance of adapting evidence-based treatments to the cultural and contextual needs of minoritized populations. Although substantial research has examined lesbian, gay, bisexual, transgender, and queer (LGBTQ+) mental health, comparatively little is known about the psychotherapy experiences of Chinese sexual and gender minority individuals or how dialectical behavior therapy (DBT) may be delivered responsively with this population. DBT is an evidence-based treatment for emotion dysregulation, self-harm, and suicidal behavior that explicitly addresses the effects of invalidating environments. Because Chinese cultural contexts and LGBTQ-related minority stress may both shape emotional expression, help-seeking, and treatment experiences, this qualitative study …

Post-Boom(Er) Maximalism In The Americas: Valeria Luiselli's “Lost Children Archive”, Antonio Barrenechea

English & Linguistics Articles

This article poses an alternative non-Anglophone starting point for twenty-first century maximalism through the Latin American Boom and “la novela total” that is its crowning achievement. Among such works are Gabriel García Márquez’s One Hundred Years of Solitude (1967) and Carlos Fuentes’s Terra Nostra (1975). The term’s 1960s conception by Peruvian author Mario Vargas Llosa predates Thomas Pynchon as figurehead for maximalist theorizing within First World academic environments that control the conversation. Furthermore, I examine Mexican author Valeria Luiselli’s Lost Children Archive (2019) as a case of post-Boom(er) maximalism that differs from the big novels of the Latin American luminaries. …

News Media Sentiment Toward Chinese Ai: A Comparative Analysis With Belt And Road Initiative Involvement And Public Opinion On China, Asya Vaisberg

Pomona Senior Theses

This study evaluates different countries' news media’s sentiment towards Chinese AI, between May 2023 and May 2024, by using Microsoft Azure NLP Sentiment Analysis. The results are then compared with the country’s public opinion on China and its involvement in the Belt and Road Initiative (BRI). For this study 12 countries have been selected which are USA, Australia, Pakistan, Peru, Russia, Romania, Italy, Greece, Portugal, Philippines, Brazil, and Egypt. For each one, GNews Application Programming Interface (API), which has access to more than 60,000 global news sources, was used to aggregate relevant news articles based on queried keywords. The collected …

Geography Of Erasure: Manufactured Housing, Heat Exposure, And State Neglect In Florida, Gianna M. Hutton

Pomona Senior Theses

This thesis examines Florida's manufactured housing communities through the intersecting frameworks of energy justice, critical heat studies, and housing displacement scholarship, centering how structural, political, and economic forces shape uneven exposure to thermal insecurity and housing precarity. Using a mixed-methods approach combining statistical regression analysis of American Community Survey microdata (2019-2023) and spatial case study of Miami-Dade County's heat governance and The Li'l Abner Mobile Home Community’s displacement, this research investigates how manufactured housing residents experience compounded exclusions across energy systems, urban heat governance, and housing security. The findings reveal that manufactured home residents face a 26% higher energy burden …

Place-Branding In The Japanese Agricultural Industry: A Discourse Analysis Of National, Prefectural, Municipal, And Producer Perspectives, Miyu L. Owada

Pomona Senior Theses

This essay is a case study of place-based agricultural branding in Japan, particularly in the sub-urban context of Mitaka City, Tokyo. Shifting the focus from rural revitalization models typically studied in this field, this study brings sub-urban landscapes into the conversation. Although existing studies assume a top-down policy is implemented for agricultural branding in Japan, the study assesses to what extent this structure holds true for the Mitaka context, comparing narratives across four tiers: the national Ministry of Agriculture, Forestry, and Fisheries (MAFF), the prefectural Tokyo Metropolitan Government (TMG), the municipal Mitaka City and Japan Agricultural Cooperatives (JA) Tokyo Musashi …

Left In The (Road) Dust: Analyzing Advanced Clean Cars Ii In California’S Disadvantaged Communities, Jj Hoffman

Pomona Senior Theses

Across the United States, air pollution disproportionately impacts minority groups. California’s Advanced Clean Cars II (ACC II) waiver was positioned to lead to significant environmental justice impacts, such as reductions in emissions and adverse health outcomes, by establishing stricter regulations for vehicle emissions and ensuring that 100 percent of new passenger vehicle sales are zero-emission by 2035. As the federal government recently nullified ACC II, pollution, and by extension health, could worsen, especially in disadvantaged communities. The thesis established several important relationships, including how disadvantaged communities experienced higher traffic, pollution, and worse health outcomes than non-disadvantaged communities. Though the results …

An Ideological Target Through The Archaeological Archive: The Islamic State’S Destruction Of Palmyra And Its Impact On Local Syrian Identity, Tristen A. Leone

Pomona Senior Theses

This paper investigates how Palmyra's multicultural archaeological archive incited ISIS's destruction of the site during the Syrian Civil War through an analysis of sepulchral and religious architectural structures and onomastic practices. In contributing the cultural heritage scholarship, this paper places the motives of Islamic extremist groups in conversation with intellectual discourse around the multicultural identities of the Ancient Near East during the Roman Imperial Period. Further, through anthropological methodological frameworks and the photographic archive of excavation efforts at Palmyra, I aim to center modern local communities' experiences of living on and near an archaeological site like Palmyra. In consulting modern …

Art Heals Chicago: Murals On The South Side Of Xicágo, Brenda Rodriguez

Pomona Senior Theses

Mural making as a collective art form is a tool for healing, resistance, and cultural pride in Black and Brown communities. With my focus being on Mexican American communities on the South Side of Chicago, specifically Pilsen. I make ties to indigenous motifs and the history of Mexican Muralism to show how it has evolved and how murals in the 1960s and 70s were used for healing from violence and the revolution. Murals that include images that reference the Mesoamerican past and preconquest life are a powerful way of reclaiming one’s identity and asserting one's indigeneity in the present and …

An Llm-Driven System For Doctor-Patient Simulation, Akilan Amithasagaran

Computer Science Theses

Effective physician-patient communication is fundamental to clinical competence, yet traditional simulation-based training methods using standardized patients and high-fidelity manikins are costly, resource-intensive, and difficult to scale. This dissertation presents CLiVR (Conversational Learning system in Virtual Reality), an LLM-driven system that integrates large language models and 3D avatars to simulate doctor-patient interactions for medical communication training.

CLiVR addresses three key limitations in existing virtual reality medical training platforms. First, the system operates on standalone Meta Quest 3 hardware with realistic 3D patient avatars featuring synchronized lip movements and speech-based interaction. Second, CLiVR grounds LLM responses using a curated syndrome-symptom database, constraining …

(R)Evolutionary Cultural Literacy: Pauli Murray’S Boundary-Crossing Tripartite Pedagogy, Lorise Ann Diamond

CGU Theses & Dissertations

Civil rights lawyer, poet, activist, questioning, and Episcopal priest Pauli Murray spent seven decades generating legal doctrine, autobiography, poetry, and institutional redesign across some of the most hostile yet fecund terrain American public life produced. Scholarship across rhetoric and writing studies, cultural studies, Black feminism, and critical pedagogy has theorized literacy, movement, and commons-making as separate concerns. What the field of cultural literacy lacks is a framework that holds those concerns together, reads them through a focused body of texts, and translates them into a transferable pedagogy applicable across academic, civic, and institutional settings. This dissertation argues that cultural literacy …

How Teachers Learn Strategies To Support Students With Individualized Education Programs Through The Use Of Multi-Tiered Systems Of Support, Behrose Foroughi

CGU Theses & Dissertations

This dissertation study captured how teachers learn strategies to support students with Individualized Education Programs (IEPs) through the use of Multi-Tiered Systems of Support (MTSS). In the MTSS framework, Tier 1 serves approximately 80–85% of students with high-quality evidence-based core instruction (e.g., science of reading curriculum, social emotional curriculum); Tier 2 serves approximately 10–15% with targeted small-group interventions (e.g., data-informed small-group math/reading groups, check-in/check-out behavior programs); Tier 3 serves approximately 5% with intensive individualized support (e.g., Orton-Gillingham reading intervention groups, individualized behavior plans). Special Education is a separate, legally mandated service outside the tiers for students with identified disabilities under …

Bail Reform, Large Language Model Risk And Reasoning, William Wyatt

CGU Theses & Dissertations

This dissertation contains three studies. Each asks how rules or language change the choices people and machines make when outcomes are uncertain. The first study, written with Kiran John, evaluates California’s 2020 cashless bail reform. We use propensity score matching on arrestee records from the windows before and after implementation, and we test whether the shift away from cash bail produced any effect on subsequent offending. It did not. Matched comparisons yield small, statistically insignificant differences across every window we examined. That null result cuts against both sides of the public argument. The reform did not drive a spike in …

Electron Beam Irradiation Effects On Bulk Metals: A Comparative Study Of Polycrystalline Versus Single-Crystalline Structures, A. A. Elmustafa, N. A. Sultana, A. H. Al-Allaq, M. Ojha, Y. S. Mohammed, J. Vennekate, H. Baumgart

Mechanical & Aerospace Engineering Faculty Publications

This study investigates the effects of electron beam (e-beam) irradiation on the mechanical and structural properties of eight bulk metallic samples, comprising both polycrystalline (PC) and single-crystalline (SC) forms of Ni, Cr, V, and Ti. These metals were evaluated as potential candidates for beam exit windows in high-power (MW-class) particle accelerators. The primary objective is to identify metals capable of withstanding the conditions of high-power/MW-class e-beam accelerators and serve effectively as exit windows. Selection criteria were based on each metal’s intrinsic properties, power dissipation capability, and irradiation-induced changes in mechanical behavior, including hardness, elastic modulus, and defect density. Comprehensive characterization …

An Exploration Of Academic Help-Seeking Among Postsecondary Students: Differences By Gender And Ethnicity, Stephanie Greenquist-Marlett, Linda Bol, Claire Consadine, Courtney Hill

STEMPS Faculty Publications

Students often struggle to employ effective learning and study strategies in postsecondary settings that challenge their academic success. These struggles can be amplified depending on student characteristics like gender and ethnicity. One way to improve their success is an awareness they may need help and how to most productively use this help. We sought to understand students’ patterns of help-seeking behaviors as well as whether these patterns differed by gender and ethnicity. The researcher-developed Academic Help-Seeking Inventory (AHSI) was designed to measure academic help-seeking. Participants were 249 undergraduate and graduate students enrolled at two East Coast public universities. An exploratory …

An Ensemble Classifier For Ordinal Outcomes In High-Dimensional Genomics Data, Heranga K. Rathnasekara, Sinjini Sikdar

Mathematics & Statistics Faculty Publications

Analysis of genomics data for predicting disease outcomes is a fast-growing field in medical research. There often exist categorical, specifically, ordinal outcomes that need to be predicted based on genomic profiles. This has led to recent development of some high-dimensional ordinal classification methods that can address the large dimensionality of the genomic covariate set. These high-dimensional ordinal models tend to vary widely in their performance depending on the data they are applied to and the evaluation criteria used. In this article, we outline an ensemble ordinal classifier that integrates different ordinal modeling approaches through bootstrap-based model evaluation, multi-metric performance assessment, …

Tezepelumab's Effects On Patient-Reported Symptoms In Severe Asthma, Overall And With History Of Comorbid Chronic Rhinosinusitis With Nasal Polyps (Crswnp), Njira L. Lugogo, Joseph K. Han, Anju T. Peters, Stella E. Lee, Monica Kraft, Mary Kay Margolis, Sonia F. Shenoy, Nicole Martin, Shradha Chandarana, Christopher S. Ambrose

Department of Otolaryngology (ENT) Faculty Publications

Background

Tezepelumab (an anti-thymic stromal lymphopoietin monoclonal antibody) treatment resulted in reduced exacerbations and improved sino-nasal symptoms and health-related quality of life in patients with severe uncontrolled asthma (SUA) and chronic rhinosinusitis with nasal polyps (CRSwNP) in the NAVIGATOR study.

Objective

To evaluate the effect of tezepelumab versus placebo on sleep disturbances, activity levels, and physical exertion tolerance in NAVIGATOR patients with SUA overall and in those with past medical history of comorbid CRSwNP.

Methods

Patients (12-80 years old) with SUA were randomized to receive tezepelumab 210 mg or placebo subcutaneously every 4 weeks for 52 weeks. Patient responses to …

Three Decades Of Classifying Threatened Species: Lessons Learned From And About The Iucn Red List Criteria For Quantifying Extinction Risk, H. Resit Akçakaya, E. J. Milner-Gulland, Mike Hoffmann, Helen M. Regan, Ilona Naujokaitis-Lewis, Andre E. Punt, Kevin J. Gaston, David A. Keith, Stuart H. M. Butchart, Simon N. Stuart, Nigel J. Collar, Moreno Di Marco, Monika Bohm, Alex J. Berryman, David P. Mallon, Axel Hochkirch, Nicholas K. Dulvy, Malin Rivers, Thomas M. Brooks, James R. S. Westrip, Jonathan Paul Rodriguez, Craig Hilton-Taylor, Janet Scott, Simon Tarr, Sophie H. Ledger, Christi Linardich

Biological Sciences Faculty Publications

The IUCN Red List of Threatened Species, the most widely used global system for assessing species' extinction risk, has become a foundational source of information for conservation management, policy and research. Since the adoption of quantitative extinction risk criteria more than three decades ago, the Red List has expanded substantially in scope and influence, informing decisions ranging from species conservation and protected area designation to international agreements, corporate risk assessments and global biodiversity indicators. Given its central role, maintaining scientific rigour, transparency and trust in the Red List system is essential. Feedback from users, emerging from evolving applications and scientific …

Characterization Of Phytoplankton-Excreted Metabolites Mediating Carbon Flux Through The Surface Ocean, Yuting Zhu, Hanna S. Anderson, Eli Salcedo, Samuel E. Miller, Krista Longnecker, Melissa C. Kido Soule, Sheean T. Haley, Gretchen J. Swarr, Rogier Braakman, Sonya T. Dyhrman, Elizabeth B. Kujawinski

Chemistry & Biochemistry Faculty Publications

The marine labile dissolved organic carbon (DOC) pool is a dynamic reservoir of thousands of molecules that cycles approximately one-quarter of Earth’s primary production within days to weeks. After excretion by phytoplankton and other microbes, metabolites are rapidly consumed, resulting in low standing concentrations (picomolar to low nanomolar). Despite the decades-long search for labile DOC sources and molecular identities, marine phytoplankton exometabolomes are not well characterized, largely due to difficulties in measuring small polar molecules in saline water. Here, we profiled the exometabolomes of six axenic phytoplankton species representing key functional groups including a diatom (Thalassiosira pseudonana CCMP1335), a …

Expanded Scorpionate And Siderophore-Inspired Ligands: From Foundational Designs To Modern Applications, Austin Winfield Medley, Trandon Allen Bender

Chemistry & Biochemistry Faculty Publications

Scorpionate ligands have been advanced significantly through systematic modifications of their apical atoms and heterocyclic arms, expanding their structural diversity and chemical reactivity. Recent biologically inspired variants now enable accurate modeling of complex bioinorganic motifs, such as the Fe₄S₄ clusters of nitrogenase, and support enzyme‐like reactivity under mild aqueous conditions. These developments have broadened the impact of scorpionate chemistry across bioinorganic modeling, homogeneous catalysis, and biorthogonal transformations. In particular, expanded tripodal scaffolds provide modular, tunable platforms for mimicking enzyme active sites and probing biological nitrogen fixation pathways. Beyond fundamental insight, these ligands present practical opportunities for sustainable catalysis by enabling …

M-Type Star Spectral Analysis: Sco Line List Including The B²Σ⁺-X²Σ⁺ Band System, Léo Lavy, Jacques Liévin, Peter F. Bernath

Chemistry & Biochemistry Faculty Publications

An analysis of the B²Σ⁺ − X²Σ⁺ band system of ⁴⁵Sc¹⁶O is presented. ScO was excited in a hollow cathode discharge, and its Doppler-limited resolution spectrum was measured with a Fourier transform spectrometer. The spectroscopic constants of the B²Σ⁺ state with v ≤ 3 are reported, and equilibrium constants are derived. Ab initio transition dipole moment functions are calculated for the A²Π − X²Σ⁺ and B²Σ⁺ − X²Σ⁺ transitions and scaled using lifetime measurements. We report new line lists of hyperfine-resolved transitions for ⁴⁵Sc¹⁶O with recalculated Einstein A coefficients and oscillator strengths of the …

The Hitran2024 Molecular Spectroscopic Database, I. E. Gordon, L. S. Rothman, R. J. Hargreaves, F. M. Gomez, T. Bertin, C. Hill, R. V. Kochanov, Y. Tan, P. Wcisło, V. Yu. Makhnev, P. F. Bernath, M. Birk, V. Boudon, A. Campargue, A. Coustenis, B. J. Drouin, R. R. Gamache, J. T. Hodges, D. Jacquemart, E. J. Mlawer, A. V. Nikitin, V. I. Perevalov, M. Rotger, S. Robert, J. Tennyson, G. C. Toon, H. Tran, V. G. Tyuterev, E. M. Adkins, A. Barbe, D. M. Bailey, K. Bielska, L. Bizzocchi, T. A. Blake, C. A. Bowesman, P. Cacciani, P. Čermák, A. G. Császár, L. Denis, S. C. Egbert, O. Egorov, A. Yu. Ermilov, A. J. Fleisher, H. Fleurbaey, A. Foltynowicz, T. Furtenbacher, M. Germann, E. R. Guest, J. J. Harrison, J. -M. Hartmann, A. Hjältén, S. -M. Hu, X. Huang, T. J. Johnson, H. Jóźwiak, S. Kassi, M. V. Khan, F. Kwabia-Tchana, T. J. Lee, D. Lisak, A. -W. Liu, O. M. Lyulin, N. A. Malarich, L. Manceron, A. A. Marinina, S. T. Massie, J. Mascio, E. S. Medvedev, V. V. Meshkov, G. Ch. Mellau, M. Melosso, S. N. Mikhailenko, D. Mondelain, H.S.P. Müller, M. O' Donnell, A. Owens, A. Perrin, O. L. Polyansky, P. L. Raston, Z. D. Reed, M. Rey, C. Richard, G. B. Rieker, C. Röske, S. W. Sharpe, E. Starikova, N. Stolarczyk, A. V. Stolyarov, K. Sung, F. Tamassia, J. Terragni, V. G. Ushakov, S. Vasilchenko, B. Vispoel, K. L. Vodopyanov, G. Wagner, S. Wójtewicz, S. N. Yurchenko, N. F. Zobov

Chemistry & Biochemistry Faculty Publications

The HITRAN database is a curated compilation of validated molecular spectroscopic parameters, established in the early 1970s. It is used by various computer codes to predict and simulate the transmission and emission of light in gaseous media (with an emphasis on terrestrial and planetary atmospheres). The HITRAN compilation is composed of six major components. These components include the line-by-line spectroscopic parameters required for high-resolution radiative-transfer codes, experimentally derived absorption cross-sections (for molecules where it is not yet feasible for representation in a line-by-line form), collision-induced absorption data, aerosol indices of refraction, and general tables (including partition sums) that apply globally …

Investigating The In Vitro Antimicrobial Potential And Comprehensive Computational Studies Of New Schiff Base Derivatives, Abrar Hussain, Shahzaib Akhter, Hammad Nasir, Khurram Shahzad, Muhammad Arfan, Sand Hyun Park

Chemistry & Biochemistry Faculty Publications

Antimicrobial resistance (AMR) is a growing global health threat driven by multidrug-resistant bacteria (Staphylococcus aureus, Pseudomonas aeruginosa), and fungi (Candida albicans, and C. parapsilosis). This study evaluated six novel Schiff base derivatives (HSB-1 to HSB-6) through integrated in vitro antimicrobial activity and comprehensive computational studies. In vitro disk diffusion assay demonstrated the largest zones of inhibition against S. aureus for HSB-6 and HSB-1 (15–17 mm), activity against P. aeruginosa for HSB-5 and HSB-6 (12 mm), and moderate antifungal activity for HSB-4 (8–11 mm). Molecular docking results correlated with the in vitro findings with the binding energy ΔG = −12.3 kcal/mol …

The Diasporic Cookbook As Chronotope. [Review Of The Book Kitchens Of Hope: Immigrants Share Stories Of Resilience And Recipes From Home, By I. S. Svitak, C. J. Eaton, And I. S. Dean (Eds)], Marcella Prokop

English Faculty Publications

[Introduction] Edited by Linda S. Svitak and Christin Jaye Eaton, with Lee Svitak Dean, and published by the University of Minnesota Press, Kitchens of Hope: Immigrants Share Stories of Resilience and Recipes from Home (2025) fits neatly into the popular genre network of cookbooks that blend essay with recipe, mixing memoir with meals perfected over generations. But this book doesn't simply share the legacy of Liberian rice bread or summer beat soup. It explores the migration of these dishes and their cooks, contextualizing stories of displacement and development. Because of the breadth of this book, Mikhail Bakhtin might describe this …

A Re-Evaluation Of Atlantic Bluefin Tuna (Thunnus Thynnus) Spawning Distribution In The Western Atlantic Ocean, David E. Richardson, Katrin E. Marancik, Malgorzata Adamus, Elizabeth A. Broughton, Robert K. Cowen, Trika Gerard, Christina M. Hernández, John J. Hoey, Joel K. Llopiz, Molly E. Lutcavage, Estrella Malca, Debra L. Palka, Lourdes Vásquez-Yeomans, Harvey J. Walsh, C. Michelle Willis, Glenn A. Zapfe

Biological Sciences Faculty Publications

There is currently a lack of consensus on the spatial, seasonal and decadal-scale patterns of Atlantic bluefin tuna (Thunnus thynnus) spawning in the western Atlantic Ocean. We compiled ichthyoplankton and reproductive data to characterize bluefin spawning patterns and the uncertainty in these patterns. Ichthyoplankton data indicates that bluefin spawn in the Gulf of America/Gulf of Mexico, northwest Caribbean Sea, north of the Bahamas, along the inshore edge of the Florida Current off the Carolinas and in the western Slope Sea. Reproductive studies identified these same spawning areas, as well as the Windward Passage and waters east of the …

The Role Of Education In Reducing Social Inequality: A Systems-Level Analysis Of Socio-Technical Infrastructures And Policy Governance, Aisling O'Shea, Batzorig Dashnyam, Ximena Quintanilla

Women's & Gender Studies Faculty Publications

Social inequality remains one of the most persistent challenges to global systemic stability, threatening the robustness of democratic institutions and economic sustainability. Education has long been theorized as the primary mechanism for social mobility and the mitigation of disparate life outcomes; however, its role within modern socio-technical infrastructures is increasingly complex and often contradictory. This paper provides a comprehensive systems-level analysis of the relationship between educational architecture and social stratification. By examining the structural trade-offs inherent in contemporary pedagogical deployment, the research evaluates how institutional governance, digital infrastructure, and policy mandates either facilitate or hinder the reduction of inequality. The …

Sulfhydryl-Functionalized Diarylethenes: Synthesis, Photoswitching, And Fluorescent Properties, Pramod Aryal, Jonathan Bietsch, Gowri Sankar Grandhi, Josh Choi, Guijun Wang

Chemistry & Biochemistry Faculty Publications

Sulfhydryl group (SH) plays important roles in reactions with various functional groups, especially in biologically active systems. Photoswitchable diarylethene (DAE) derivatives have demonstrated applications in many research fields. Among the many classes of diarylethene derivatives, thiol derivatives have not been extensively explored. In this study, we systematically synthesized and characterized a series of bis-thiol functionalized dithienylethene derivatives. The thiol groups in this series are attached directly to the thiophene, or through a phenyl or methylene linker. Each series incorporated both dithienyl cyclopentene and hexafluorocyclopentene bridges and total six thiol substituted diarylethenes were synthesized. Among the six sulfhydryl DAE derivatives, four …

Nonpyrogenic "Black" Nitrogen Likely Plays A Major Yet Underrecognized Role In The Global Nitrogen Cycle, João Vitor Dos Santos, Aleksandar I. Goranov, Kyle M. Lambert, Theodoro Da Rosa Salles, Susan J. Carter, Ann Pearson, Patrick G. Hatcher

Chemistry & Biochemistry Faculty Publications

Condensed aromatic nitrogen (ConAN) is commonly found in soil and aquatic environments. ConAN is broadly viewed by the biogeochemistry community as a combustion-derived product leading to its frequent designation as pyrogenic “black” nitrogen. Here, we provide evidence that ConAN can also form through nonpyrogenic pathways. In an experiment simulating biomass oxidation, pine wood boards assembled with iron nails were exposed to 12 years of natural environmental conditions. Nitrogen concentrations increased from 0.2 to 1.2 wt % with increasing proximity to the nail. Ultrahigh resolution mass spectrometry showed enrichment of nitrogen-containing compounds within the lignin and condensed aromatic domains. X-ray spectroscopic …

Land Use Influences Dissolved Organic Matter Composition In The U.S. Coastal Critical Zone Network, Aleksandar I. Goranov, Elizabeth V. Whitney, Brian R. Moyer, Katherine L. Tully, Patrick G. Hatcher, Yu-Ping Chhin

Chemistry & Biochemistry Faculty Publications

Coastal watersheds are highly productive biogeochemical systems supporting robust coastal fisheries and contributing significantly to the marine gross primary production flux. These ecosystems are comprised of civil infrastructure, farms, forests, and marshes, and their diversity is reflected in the quantity and quality of dissolved organic matter (DOM). Here, we assess the role of farming in influencing DOM from surface waters of six coastal tidal creeks adjacent to forest and farm sites in the US Critical Zone Network. Molecular fingerprinting using electrospray ionization - Fourier transform - ion cyclotron resonance - mass spectrometry revealed that farm-influenced DOM was enriched in nitrogen-, …

Multidentate Surfactant-Dependent Synthesis Of Giant Iridium Superstructures, Ramjee Balasubramanian, Maeren E. Hill

Chemistry & Biochemistry Faculty Publications

Giant superstructures of iridium, comprised of smaller spherical and slightly larger anisotropic nanoparticles, were synthesized by reducing iridium chloride in the presence of resorcinarene, a class of tetrameric macrocyclic polyphenols, with sodium borohydride in ethanol in 30 min under mild conditions. These superstructures were characterized by a range of techniques including TEM, HRTEM, EDS and other spectroscopic methods. The impact of the macrocyclic surfactant, its features and reaction conditions in dictating the formation of giant iridium superstructures was evaluated. The packing density of nanoparticles in these giant iridium superstructures could be altered qualitatively by varying the duration of the reaction, …