This project examines what legal writings from ancient Rome reveal about the political ideology, social values, and power dynamics in Roman history. I focus on these concepts through analyzing selections from two sets of speeches given by Cicero, a politician, loyal proponent of the Roman Republic, and philosopher educated in both Latin and Greek. Additionally, I explore the scholarship on Roman legal history to provide supplementary cultural context. The sociopolitical climate of the late Roman Republic was tumultuous. Near the beginning of Cicero’s political career, he gave a set of orations, In Catalinam, to the Senate that accused Catiline of conspiring against the consuls. Much later, Cicero tried to keep the Republic alive after Caesar’s assassination and accused Mark Antony of being disloyal to Caesar by wanting to create an empire. This urge to defend the Republic prompted Cicero to write his Philippicae to attack Mark Antony. These orations ultimately resulted in Cicero’s death, as Mark Antony wanted, and the Republic ended. My research compares Cicero’s In Catilinam 1, 2, and 4 and Philippicae 4, 5, and 14: both sets involve murder plots, denunciations of powerful men, and the senatus consultum ultimum decree for Republican emergency. Specifically, I analyze how Cicero uses oratory to convince the Senate to declare Catiline and Mark Antony as public enemies. This process reveals elements of Roman sociopolitical culture, such as values, threats, and legal procedures, and follows these differences in this short, but crucial, time period in Roman legal and governmental history. Furthermore, it demonstrates the complexity between the government and the conflicting political ideologies during the late Roman Republic. Thus, through detailed analysis of these selected passages and their wider contexts, I explore how the Catilinarian and Philippic orations use references from Rome’s earlier history to adapt to, and reflect, their particular moments.

Aphasia is a language impairment that is often acquired due to left hemisphere stroke. Although current treatment for aphasia is successful, it is often limited to what is explicitly trained during treatment. That is, when conducting a single-word treatment protocol, persons with aphasia tend to only improve on naming the words given during treatment and show little to no improvement on untrained words. This study is focused on identifying what conditions improve naming untrained words after receiving aphasia treatment. For 8 individuals with aphasia, we assessed change in naming 120 pictures after undergoing a repetition priming task for 30 of those words. For a given “trained” word, its corresponding picture, printed name, and spoken name were presented to the participant four times, followed by an opportunity for the participant to verbally produce the name. For pre- and post- test naming, we implemented a standard coding method to ensure specific and consistent scoring, where responses were only scored correct if the participant verbally produced the entire picture name. We found that all participants improved in naming the 30 trained words. However, our results were mixed regarding improvement on naming the untrained words. Critically, we noticed two participants whose responses were not always verbal productions of the word, but rather spelled words (in one case verbally and in the other case through writing). This led us to question whether these coding parameters allow us to accurately identify if an individual is benefiting from treatment. We argue that incremental gains in productions (e.g., through spelling) also provide evidence of improved access to words. We focus this presentation on how alternative coding schemes for these two participants might change our interpretation of their outcomes, and discuss how future research should consider more inclusive scoring methods.

The spread of grasslands 26-22 million years ago has been linked to global climate changes in the late Oligocene to early Miocene. The pattern of vegetation change was established analyzing assemblages of microscopic plant silica (phytoliths) extracted from sediment samples from the Central Great Plains of North America. It is often presumed that as open-habitat grasses became abundant, vegetation structure concurrently transitioned from closed forests to open landscapes. However, recent work in the Cenozoic of Patagonia has pointed to a decoupling of grass dominance and habitat openness, each independently driven by climatic conditions. We set out to test if a similar decoupling occurred in the Central Great Plains by means of an a-taxonomic phytolith proxy using phytoliths produced in non-grass epidermal cells. Work in modern plants and soil assemblages has shown that the size and degree of undulation in these phytoliths (quantified by, respectively, Phytolith Area, PA, and the Phytolith Undulation Index, PUI) is correlated with the amount of light in the environment, reflecting habitat openness (measured as Leaf Area Index, LAI). We measure the PA and PUI of phytolith samples from Nebraska, dating 35 to 17 Ma, to reconstruct the regional LAI over time and place time constraints on the opening of habitats. By comparing this timeline to that of the rise to dominance of grasses, we hope to better understand changing vegetation and linked climatic conditions in Cenozoic North America.

Ever since they first appeared during the Late Cretaceous, members of the palm family (Arecaceae) have been ubiquitous in the fossil record. Traditionally, palms have been considered a key indicator of warm climates. In addition to leaf macrofossils, fruit, and pollen, palm phytoliths have gained utility as paleoecological indicators. Phytoliths are microscopic silica bodies accumulated in the tissues of many plants. Different plant taxa have unique phytolith morphologies, making them useful diagnostic tools. However, palm phytoliths currently lack diagnostic resolution below the family level, limiting our ability to fully utilize these powerful tools. The goal of our project was to increase this resolution by analyzing the morphology of phytoliths from across the entire Arecaceae family in more detail than has been possible before. We used confocal microscopy to take sharp, high-resolution images of palm phytoliths. Using these images, we took several key measurements, to which we applied multivariate ordination methods. Our analysis allowed us to test how well we can differentiate palm subclades within Arecaceae based on phytolith morphology. Ultimately, we hope to use this information to determine when and where specific clades of palms appeared in the fossil record, increasing our understanding of the evolution of the palm family. This will also allow us to describe past environments in more detail based on palm phytoliths, including estimating more specific climate parameter ranges, and characterizing particular biomes and habitats.

 Seed dispersal is a crucial phase of plant lifecycles. Effective dispersal is important to the ecosystem as a whole because it affects composition of the community, ecological succession, and response to climate change. Given the importance of seed dispersal, understanding the factors that contribute to the evolution of varied dispersal modes and promote convergence on specific dispersal strategies is particularly important to understanding grass ecology because it may allow us to understand the relationship between dispersal mode and habitat. In this study, we are interested in dispersal modes within the onion grasses (Melica), a small genus of perennial grasses, primarily distributed in temperate regions. The onion grasses are found in a wide variety of habitats and possess a remarkable diversity of seed dispersal strategies. These traits make them a useful case study for better understanding the factors that influence the evolution of dispersal strategies in grasses. We are testing the hypothesis that evolution in traits associated with seed dispersal is correlated with changes in habitat. In particular, we hypothesize that the evolution of wind dispersed seeds follows transitions into open habitats. Seed dispersal structures (diaspores) were collected from 46 grass species (35 Melica and 11 outgroup). To assess wind dispersal potential, we quantify falling velocity by filming seed descent at 1000 fps. Lower falling velocities are associated with higher wind dispersal potential. Diaspores were photographed and the images were used to measure surface roughness, which is associated with adhesive dispersal potential. These data, along with diaspore mass and plant height, were mapped onto the evolutionary tree of the onion grasses. We then ran tests of correlated evolution between seed dispersal traits and habitat type. Initial results indicate that convergence upon wind dispersal may be in part driven by convergence upon disturbed habitat types.

In a given year, a combined surplus of 20,000 transplants are performed in the US for patients requiring a new kidney, liver, or heart, and the need for these organs continues to increase rapidly with changes in societal and cultural outlooks on personal behavior. Recent regenerative medicine techniques have been implemented in attempts to create engineered tissues that support solutions to these problems, yet they are limited to thin or avascular tissues. In order to create thicker tissue constructs for implantation, vascular networks must be introduced to supply nutrients and oxygen to highly metabolic tissues. Yet, current methods can be expensive or require high-tech equiptment. To address this issue, this project aims to design a construct that integrates two vascularization techniques into a multilayered tissue. This new design of a thicker tissue will benefit from the advantages of both independent systems, endothelial cords and perfusable, patterened microvessels, advancing the tissue engineering field.