Life Sciences Commons^™

Migratory Material: Epigenetics & Weaving At The Us-Mexico Border, Valerie Navarrete

Masters Theses

Discourse often sutures the body shut, disallowing representations of identity to outgrow sociopolitical interests. This issue may originate from borders, but also from the unnamable pathology that generational colonial trauma transmits to the mind, body, and environment. Without a direct form of translatability, this thesis proposes a new materialism that deviates from any object-oriented ontology. Untethered and intra-active, epigenetics and weaving represent objects that transform typical ways of knowing and seeing. Their sensitivity to the environment, in addition to their mobility across generations of time, broaden the spatiotemporal loci of the body and its embodiment. Proposing new materials that expand …

Palynology And Paleoclimatology Of The Chicxulub Impact Crater In The Early Paleogene, Vann Smith

LSU Doctoral Dissertations

At the end of the Cretaceous Period, a large bolide impacted the Earth and formed the Chicxulub impact crater in the Yucatán Peninsula, Mexico. In 2016, International Ocean Discovery Program (IODP) Expedition 364 Site M0077 drilled into the buried peak ring of the crater, recovering a marine Paleocene to early Eocene post-impact section deposited on top of the impact breccia. Palynological analysis of 195 samples from the post-impact section has yielded the first pre-Holocene vegetational record from inside the Chicxulub impact crater and the first palynological record of the recovery of life following the end-Cretaceous mass extinction from inside the …

Comparing Semi-Urban And Forest Populations Of The Jalisco Mud Turtle (Kinosternon Chimalhuaca), Jose Garrido

All Master's Theses

Mud turtles (family Kinosternidae) are primarily threatened by climate change, overexploitation, and land development. To survive in increasingly urbanized and arid regions, mud turtles often inhabit man-made water sources such as cattle troughs and irrigation ditches. These bodies of water are critical in urban habitat where they may offer some of the last remaining refugia; however, the effect of these conditions on population structure is poorly understood. The Jalisco mud turtle (Kinosternon chimalhuaca) was described in 1997 from a small range south of Puerto Vallarta, Mexico. Since its description, critical ecological research has remained largely nonexistent, hindering …

Soil Sustainability Of Forest Bioenergy Feedstocks Across The Americas, Michelle Brill

Dissertations, Master's Theses and Master's Reports

Many sources of woody biofuels provide alternative options to fossil fuels that can help mitigate greenhouse gases. One key component of feedstock sustainability from an ecosystem service perspective is soil sustainability. We examined eucalyptus (Eucalyptus grandis) plantations in the warm-temperate entic and mollic soils of Northeastern Argentina, oil palm plantations (Elaeis guineensis Jacq.) in the tropical alfic soils of Southeastern Mexico, and aspen (Populus tremuloides) in the cool-temperate spodic soils of Northeastern United States. The following elements were measured in soil increments of 15 cm, down to a total of 60 cm: carbon (C), nitrogen …

Species Delimitation Predictions Using Mitochondrial And Nuclear Dna Sequences From The Heteromys Pictus-Spectabilis Species Complex, Joanna Rosa Bateman

Theses and Dissertations

Heteromys pictus-spectabilis is a species complex within the subfamily Heteromyinae (Family: Heteromyidae) that is distributed along the western and southern Mexican coast and surrounding environments. Currently, the species complex is accepted as being 2 separate species (H. pictus and H. spectabilis), but this also renders H. pictus paraphyletic. Therefore, the species complex requires re-evaluation in order to resolve the paraphyly. Mitochondrial DNA sequences from a previously existing ~720 specimen database compiled by Victoria Vance were used in conjunction with new nuclear DNA sequences sequenced for the purpose of this study to generate multiple phylogenetic trees via the software programs RAxML, …

Trends In Antibiotic Resistance And Correlations Of Antibiotic Use And Antibiotic Resistance In A Small Hospital In El Paso, Texas 2013-2015, Christopher Olivas

Open Access Theses & Dissertations

Antibiotic resistance is a serious public health threat, primarily, resulting from the excess and inappropriate use of antibiotics. Antibiotic resistance and antibiotic consumption trends may differ along the U.S-Mexico border from the rest of the U.S. due to geographical and cultural differences unique to the border region. The objectives of this study were: 1.) To examine the trends in antibiotic resistance among E. coli, ESBL producing E. coli, P. aeruginosa, S. aureus, and MRSA over a 3-year period (2013, 2014, 2015) in a U.S.-Mexico border area hospital; 2.) To examine the trends in antibiotic consumption among aztreonam, cefazolin, cefepime, ceftriaxone, …

The Diet And Subsistence Methods Of The Maya: Their Health And Cultural Consequences From The Pre-Classic Era To Today, Rachel E. Watson

Honors Undergraduate

The Maya, a once great civilization, seemingly vanished without an obvious reason, before the Spanish landed in the region. Some say that their downfall was a result of famine and inadequate nutrition. Surprisingly, most of the archaeological evidence surrounding the Classic Maya diet and subsistence methods indicates that they both adequately sustained the population to the point where there has been practically no change over hundreds of years. Change did not occur to the Maya diet or the classic subsistence methods until the late twentieth century when the tourism industry exploded in the area of the former Maya empire. The …

Distribution And Condition Of Stony Corals In The Veracruz Reef System National Park: A Management Perspective, Mauricio López Padierna

HCNSO Student Theses and Dissertations

The Veracruz Reef System (VRS) is located in the southwestern Gulf of Mexico. It is comprised of 28 coral reefs in various stages of development and conservation. They are protected under the Parque Nacional Sistema Arrecifal Veracruzano National Park created in 1992. There are many threats to the reefs of the VRS, including the Port and city of Veracruz, which hosts half a million inhabitants and Mexico’s oldest active port. The inhabitants of Veracruz have used reef resources for thousands of years, as evidenced in archaeological sites on Sacrificios island, and constructions throughout the city, most notably in the San …

The Mexican Water Forest: Benefits Of Using Remote Sensing Techniques To Assess Changes In Land Use And Land Cover, Maria F. Lopez Ornelas

Master's Projects and Capstones

In the past 30 years, anthropogenic activities like urbanization, agriculture, road fragmentation and deforestation have resulted in changes in the land use and land cover (LULC) in the Mexican Water Forest. Due to the important ecosystem services, and the natural resources this forest provides, in Mexico, it has become increasingly necessary to use new technologies and tools to support the planning, implementation and integration of forest management and conservation plans, as well as ecological and socioeconomic analysis of this ecosystem. Remote Sensing techniques and Geographic Information Systems (GIS) have been a true technological and methodological revolution in the acquisition, management …

High Diversity Of Trypanosoma Cruzi Discrete Typing Units Circulating In Triatoma In Western Mexico, Uyen T. Nguyen

All Master's Theses

Chagas disease is caused by the protozoan parasite Trypanosoma cruzi, which is transmitted to domestic and sylvatic mammals via the feces of hematophagous hemiptera of the subfamily Triatominae (Reduviidae). Trypanosoma cruzi is found only in the Americas and displays remarkable genetic diversity. Seven discrete typing units (DTUs) are currently recognized (TcI–TcVI and TcBat). In Jalisco, Mexico, where Chagas disease has a high prevalence rate, TcI has historically been the only DTU reported. This study focused on the molecular identification of T. cruzi DTUs circulating in Triatoma near the Estación de Biología Chamela, on the southwest coast of Jalisco, Mexico. …

Price Impacts Of Increased Peruvian Table Grape Supply, Jacob W. Iest

Open Access Theses

In the last decade, Peru has begun to structure its economy and complete infrastructure projects to promote agricultural export growth. Bolstered by the signing of the Peru Trade Promotion Agreement (PTPA) with the U.S., table grape production has increased significantly since 2006. Peru has a climatic advantage for a quality harvest from November to March, which overlaps the end of the U.S. growing season. With this supply increase expected to continue, U.S. producers and marketers question the effect Peru will have on "late-season" table grape prices in North America.

This thesis is a study of the effects of an increase …

Multiple Approaches For Assessing Mangrove Biophysical And Biochemical Variables Using In Situ And Remote Sensing Techniques, Francisco Javier Flores De Santiago

Electronic Thesis and Dissertation Repository

Mangrove forests are important ecosystems and play a key role in maintaining the equilibrium in coastal lagoons and estuaries. However, in recent years, there has been a considerable loss of mangrove extension due to anthropogenic activities. Recent studies suggest that multiple in situ and remote sensing approaches must be carried out to understand the dynamics in these complex ecosystems. Therefore, the objective for this PhD dissertation is to develop multiple techniques for monitoring the seasonal biophysical and biochemical conditions of the mangrove forests. Particular objectives will include: i. Test the feasibility of using a Chlorophyll Content Index from a …

Pesticide Regulation Differences Of The U.S., Chile, And Mexico On Imported Berries, Kayla Felicia Gardener

Agribusiness

Growing consumer demand for knowledge in the area of food safety and producer accountability on what is applied to fresh produce is resulting in a greater need for transparency in the industry. Additionally, the demand for safe, fresh produce year round has led to extensive international trade and consumers to wonder if imported produce is of the same quality of that in produced in the U.S. The study analyzes the differences and similarities between pesticide application tolerance standards, and labels for applied use on berries produced in the U.S., Mexico, and Chile. This is done by reviewing tolerance information and …

Examining The Relationship Between The Exchange Rate, Foreign Direct Investment And Trade, Shanta Parajuli

LSU Doctoral Dissertations

Extensive research has been carried out on the relationships among foreign direct investment (FDI), exports, the exchange rate, and economic growth. However, these research findings are mixed and inconclusive. Therefore, further research and discussion are needed on this topic. This study focused on Mexico, since it is one of the major FDI recipient countries in Latin America and much of its trade is a result of its free trade agreements. This study examines the relationship between FDI, exports, and economic growth in the context of FDI from developed to developing countries (Mexico). The second chapter analyzes the relationship of FDI …

Historical Diversification Of Montane Herpetofauna Within And Between The Sierras Of Mexico, Robert William Bryson Jr.

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Mexican highlands consist of four major mountain ranges spanning most of mainland Mexico. The evolutionary history of the Mexican highlands has been shaped by various geological and climatic events over the past several million years. The relative impacts of these historical events on diversification in montane taxa, however, remains uncertain. I used mitochondrial DNA data from three widely distributed species complexes of lizards as a model system to exemplify the potential roles of Neogene mountain formation and Quaternary climate change on timing and tempo of diversification across the Mexican highlands. My results suggested strong geographic partitioning of genetic variation …

Economics Of U.S. Government Debt Accumulation, Carlos Ignacio Garcia Jimenez

LSU Doctoral Dissertations

The United States of America is an indebted nation in the early years of the new millennium, changing from $469 billion in 1973 to $14 trillion in 2010, as spending is justified on the basis that it promotes GDP growth which in turn increases societal benefits. Despite the benefits of debt, its effectiveness and the transmission mechanisms of fiscal policy are still on debate. Consequently, the economic effects of U.S. government debt accumulation are studied in three empirical research articles.

The dissertation is composed of five chapters. The first chapter is an introduction wherein the problem statement, the purpose, objectives …

Historical Biogeography Of North American Nightsnakes And Their Relationships Among The Dipsadines: Evidence For Vicariance Associated With Miocene Formations Of Northwestern Mexico, Daniel G. Mulcahy

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

I used a hierarchical approach to study historical biogeography in a group of colubrid snakes found in western North America. I combined small regions of mtDNA sequence data from a large number of individuals, with complete mt-genomic data. First, I investigated the relationships among leptodeirines—a presumed subgroup of dipsadines, including nightsnakes (Pseudoleptodeira, Eridiphas, and Hypsiglena)—using ~1.5 kb of data (cob and nad4). The relationships differed among parsimony, likelihood, and Bayesian analyses. All analyses supported the monophyly of the nightsnakes; however, none supported the monophyly of the leptodeirines. Instead, these data supported a new hypothesis …

A Unit On The Agriculture Economy In Mexico For Use In An Eighth Grade History Course To Facilitate The Teaching Of Economic Concepts, Lillian F. Hole

Graduate Student Research Papers

This study was made to aid in teaching economic concepts in an eighth grade history unit on Mexico. The economic problems in Mexico, especially in the area of agriculture, are compared to similar problems in the United States to show that, though the problems in Mexico may be similar to problems that have developed in the United States, there are factors that make it necessary to use a much different approach in solving them.