Session TWO
10am-10:50 Arizona | 11am-11:50 New Mexico
1pm-1:50 Florida | 1400-1450 Argentina
10am-10:50 Arizona | 11am-11:50 New Mexico
1pm-1:50 Florida | 1400-1450 Argentina
To enter session rooms, please click on the links below each room number. Links will be active only on the day of the conference.
Moderadora: Adriana Ludmila Szymañski, La Universidad Nacional de Cuyo, Mendoza, Argentina
Greta Faure. ¿Agrupados por el frío? Termorregulación social como estrategia de ahorro energético en un marsupial endémico de zonas áridas (Thylamys bruchi)
Co-autores: M. Soledad Albanese, Rosarita Sanchez Dómina, Cielo Linares, Paola Sassi
Universidad Nacional de Cuyo, Mendoza, Argentina
Las bajas temperaturas representan un gran desafío para los pequeños mamíferos de ambientes estacionales, ya que mantener la temperatura corporal es esencial para su supervivencia. Una de las estrategias que contribuyen al ahorro energético es la termorregulación social, que consiste en agruparse reduciendo la superficie expuesta al frío, y así, la pérdida de calor corporal. *Thylamys bruchi* es un pequeño marsupial descrito como solitario, aunque existen registros a campo de anidamiento compartido. Este estudio evalúa si este comportamiento puede ser explicado, en parte, por la termorregulación social. Para ello, los individuos fueron evaluados bajo dos regímenes de fotoperiodo y temperatura, correspondientes a invierno (n = 8) y verano (n = 6), de a pares e individualmente. Además se realizó una aclimatación al anidamiento compartido, durante la cual se permitió el agrupamiento. Utilizando un sistema de respirometría de circuito abierto, se estimó la tasa metabólica basal (TMB) y la tasa metabólica por debajo de la zona termoneutral (TM15°C) específicas para el peso durante ambos regímenes. Asimismo, se calculó la TMB antes y después de la aclimatación al anidamiento compartido. El efecto de las aclimataciones sobre la TMB no fue significativo. En cambio, la TM15°C fue significativamente mayor en individuos medidos individualmente que en pareja, tanto en invierno (test-t pareado, p < 0.001), como en verano (test-t pareado, p = 0.0058). En conclusión, el anidamiento compartido en *T. bruchi* contribuye significativamente al balance energético, permitiendo un ahorro frente a desafíos térmicos frecuentes en su hábitat, tanto invernales como estivales.
Mariana Piccione, Pamela Quintas, Roxana González. Impacto del ambiente sobre la composición funcional de frutos secos de la región centro-oeste argentina
Co-autor: Eduardo Trentacoste
Universidad Nacional de Cuyo, Mendoza, Argentina
En los últimos años, los frutos secos han originado gran interés tanto en la comunidad científica como en los consumidores. Estudios clínicos y epidemiológicos indican que el consumo regular de frutos secos, reduce el riesgo de enfermedades cardiovasculares, diabetes, cáncer y enfermedades inflamatorias. Estas propiedades son determinadas por la composición química de los frutos secos. Sin embargo, factores tales como el genotipo, el ambiente y las prácticas agronómicas pueden modificar su composición química. El objetivo del presente trabajo fue determinar el perfil de compuestos fenólicos, el contenido de fenoles totales (CFT) y la actividad antioxidante in vitro (AOX) de nueces y pistachos provenientes de diferentes zonas productivas de las provincias de Mendoza, San Juan y La Rioja. Los resultados obtenidos evidenciaron diferencias significativas entre ambas especies (p < 0,05). El CFT en nueces varió entre 1013-1758 mg AGE/100 g ps y 1459-1749 mg AGE/100 g ps, en las temporadas 2023/2024 y 2024/2025, respectivamente. En el caso de pistacho, el CFT varió entre 402-475 mg AGE/100 g ps en la temporada 2024/2025. Respecto al perfil de fenoles, ácido gálico, ácido p-cumárico, ácido ferúlico, rutina, catequina y luteolina, fueron los mayoritarios en ambas especies. En cuanto a la AOX, fue significativamente diferente entre ambas especies de frutos secos y estuvo determinada por la concentración de fenoles presentes, variando entre 181-356 mM Trolox g-1 en nueces y 65-160 mM Trolox g-1 en pistachos.
Augusto Marchionni. Representaciones de la esclavitud en la obra de Frederick Douglass. Narrative of the Life of Frederick Douglass, an American Slave
Universidad Nacional de Cuyo, Mendoza, Argentina
Narrative of the Life of Frederick Douglass, an American Slave es el primer texto autobiográfico de este autor, publicado en 1845, que narra sus experiencias como esclavo afroamericano en el antebellum estadounidense. Es considerada una de las más preeminentes narrativas esclavas escritas en ese período, y un potente estímulo para el movimiento abolicionista durante la primera mitad del siglo XIX. Este trabajo propone analizar la construcción o discurso realizado que concierne a la esclavitud en los Estados Unidos en los años previos a la Guerra de Secesión, reconociendo la importancia del estudio de las vivencias de los sujetos subalternos para una construcción más completa de la historia. Dicho análisis parte desde la perspectiva proveída por la Teoría de la Historia, empleando particularmente los conceptos de representación y narratividad. Veremos entonces cómo Douglass plasma sus experiencias, cuáles son las que más destaca y cuáles quedan relegadas, y cuál era su intención en ese contexto histórico, en el que las voces abolicionistas comenzaban a cobrar fuerza, al relatar sus vivencias. Es de particular interés que el autor mismo haya sido esclavo, lo que desafía nociones tradicionalistas sobre las subalternidades como agentes históricos y al mismo tiempo provee nuevas perspectivas para complementar los relatos oficiales. Concluimos que Narrative of the Life of Frederick Douglass, an American Slave representa acertadamente las vicisitudes de la vida esclava, además de construir un discurso que buscó informar a sus congéneres de la situación que vivían los esclavos afroamericanos para generar apoyo para la causa abolicionista.
Moderator: Karna Walter, The University of Arizona, Tucson, Arizona
Natalia Morales. How Student Centered Learning Can Be Used to Support Hispanic/Latinx Students and Instructors in Higher Education
The University of Arizona, Tucson, Arizona
This study examines the effectiveness of using student-centered learning (SCL) as a culturally responsive pedagogy with a focus on supporting Latinx students in higher education. This is a self-study conducted by instructors of an intro-level Mexican American Studies course alongside an undergraduate researcher using student reflection papers. Early results show a strong identification with course content from Latinx students, along with critical engagement with the material from most students, demonstrating that SCL is an effective teaching strategy to increase student success and engagement.
Gonzalo di Carlo Robles. Effect of urbanization on the ecological interactions of Ligaria cuneifolia (Loranthaceae)
Universidad Nacional de Cuyo, Mendoza, Argentina
Urbanization typically degrades native ecosystems. To assess its effect on native plant interactions, we studied species interacting with Ligaria cuneifolia (a native South American mistletoe) at two key life stages: host parasitism and flower pollination. We evaluated the influence of host characteristics and their environment across an urbanization gradient in Greater Mendoza, Argentina. Our survey of 1080 parasitized plants revealed a significantly higher abundance of parasitized hosts in sites with low impermeable surfaces (n=1027) compared to urban sites (n=53), showing a clear preference for specific host species. For instance, in native plant sites, Zuccagnia punctata and Senegalia sp. were most parasitized (57% and 27% respectively), while in urban areas, Ulmus sp. was predominantly affected (87% and 89% respectively). Regarding pollinators, the semi-urban site saw more floral visitors (n=34 hummingbirds, n=139 bees) than the urban site (n=19 hummingbirds, n=94 bees). These results demonstrate that urbanization acts as a filter, limiting the dispersal and establishment of this hemiparasitic species.
Jadiel Pinto Ruiz. Development of an Electrochemical Biosensor for the Detection of Serotonin Using Metallic Alloys
Co-author: Joshua Reyes Morales
Universidad Ana G. Méndez, San Juan, Puerto Rico
Serotonin is an important neurotransmitter that regulates various functions of the central and enteric nervous systems, as well as diverse physiological processes. The abnormal release of serotonin has been associated with medical conditions, including mood disorders such as
depression and certain types of cancer like carcinoid tumors. Current methods for measuring serotonin are often expensive, requiring specialized equipment and trained personnel. In addition, the interference of structurally similar molecules such as dopamine presents
challenges for selective detection. This experiment focuses on developing a serotonin biosensor using metallic catalytic alloys, reduced through chemical synthesis in an emulsion system. NaBH₄ was used as a reducing agent, with metal salts dissolved in the aqueous phase. The alloys were formulated from copper (Cu), cobalt (Co), and nickel (Ni), and were used to modify glassy carbon electrodes (GCE) through the drop-casting technique. Electrochemical studies were conducted to identify the oxidation potential of serotonin and evaluate the selectivity of the electrode in the presence of common interferents such as dopamine. The electrode modified with the CoCu alloy showed oxidation potentials different in comparison to the unmodified control. For example, CoCu showed serotonin oxidation approximately at (0.42) V vs Ag/AgCl, while unmodified serotonin oxidized at (0.38) V vs Ag/AgCl. The CoCuNi alloy, evaluated through square wave voltammetry (SWV), clearly separated the peaks of dopamine (0.21 V) and serotonin (0.50 V), avoiding overlaps. Additional studies will be conducted to evaluate the performance and specificity of neurotransmitter biosensors like this one for future applications.
Anusha Sharma. The Colors of My Journey
The University of Arizona, Tucson, Arizona
This project hopes to create an original children's book about the immigrant experience, specifically the journey of an Indian child adjusting to life in the United States.. The story will tackle issues such as identity, cultural adjustment, and belonging, providing young readers with a sympathetic and authentic picture of these challenges. The book will emphasize the beauty of accepting two identities while also fostering empathy and cultural awareness, ensuring that South Asian children see their own stories represented in the novels they read.
Moderator: Allen Varela, Florida International University, Miama, Florida
Deekshitha Alladi. Finding the X-ray binaries where black holes are spun up by tides with the help of Cogsworth and the eRosita telescope.
The University of Arizona, Tucson, Arizona.
Gravitational waves are produced by binary black holes where one black hole is highly spinning. However, the origin of such highly spinning black holes remains unclear. Recent works propose that the tidal spin-up of the companion star in an X-ray binary could explain the spin of one of the black holes in a GW event. This research aims to leverage galactic and local universe X-ray observations to constrain the origin of the black hole spin. Additionally, it will use data from the eRosita telescope to check the maps simulated with the population synthesis code Cogsworth.
Michael Crenshaw. Analyzing the Legal Frameworks Protecting Nepalese Cultural Heritage.
Florida International University, Miami, Florida.
Nepal's unique characteristics set it apart from other nations. Its geography extends from the vast land diversity ranging between the northern Himalayan mountain range and the southern Terai, to the awe-inspiring spiritual architecture and decorative street art from younger generations, to the geopolitical turmoil the self-governing nation finds itself constrained between the powers of China and India. Each of these topics will come into play as I discuss the history of Nepal’s tangible heritage property - from the spiritual narratives behind these artifacts, to the illicit trade market which spans thousands of years. The issue of heritage repatriation has been dealt with in other continents (Africa, South America, Europe), and while many lessons can be learned from the cultural loss Nepal has faced for thousands of years, this paper focuses on advocacy and victories from the past five decades, as increasing globalization has led to calls for institutional transparency and accountability, and Nepalese repatriation efforts highlight the cultural importance heritage property holds on a nation’s identity. This paper will focus explicitly on legal frameworks and political repatriation activities - from United Nations agencies, local and national provisions, and the grassroots organizations working to repatriate heritage on a national level. Research methodology includes a review of the current literature, a dissection of law and policy pertaining to Asian heritage protection and the global illicit trade, as well as interviews conducted with public litigators, researchers, and community advocacy groups.