Life Sciences Commons^™

Diaryl Oxazoles As Cleavable Linkers For Drug Discovery Platforms, Elizabeth Taggart

Honors Theses

Within the field of medicine and pharmacology, discovering small molecule or biologic based molecules with therapeutic potential is a difficult task. Current methods involve individually screening hundreds of compounds on a potential target biomolecule, and recent technologies have explored peptide encoded libraries (PELs) as a means of making this screening process more high-throughput. These libraries produce a large number of small molecule drug candidates each conjugated to a unique peptide fragment, functioning as a barcode. Analysis of PELs requires the capture of hit small molecules and the subsequent release of their peptide tags; however, current approaches are limited in their …

Investigation Of The Vira Linker Domain To Characterize Its Phenol Interactions, Jessica Garofalo

Honors Theses

The soil bacterium Agrobacterium tumefaciens causes tumors in plants through interkingdom gene transfer. This transfer is initiated upon a wounding event that results in the release of plant signaling factors such as phenols and sugars that are recognized by protein machinery in the periplasm and inner membrane of A. tumefaciens. The histidine kinase protein VirA, in combination with the periplasmic protein ChvE, recognizes these signals and initiates induction of virulence genes via a signaling pathway, culminating with the insertion of tumor-inducing T-DNA into the wounded plant cells. While the interaction between the Periplasmic domain of VirA and sugar-bound ChvE …

Bryophytes Of Goochland County, Virginia, Mikayla Quinn

Honors Theses

Bryophytes are non-vascular land plants that include mosses, liverworts, and hornworts. Although easier to overlook because of their smaller size, bryophytes are a fundamental part of the ecosystem. As such, maintaining record of their biodiversity is important. Yet, records of bryophyte species in Goochland County, VA were low compared to more thoroughly documented counties such as Prince Edward County. This study expands the documentation of bryophyte flora and presents a checklist of bryophyte species found Virginia’s Goochland County from 2020-2023. Fieldwork conducted at public and privately-owned properties throughout the county between January 2020 and March 2023 yielded 702 specimens that …

Role Of Cdx4 And Sp5l In Zebrafish Development, Wesley Tsai

Honors Theses

The Caudal Type Homeobox transcription factors cdx are a family of genes found in vertebrates that regulates body regionalization and anterior-posterior patterning. They are also responsible for regulating axial elongation, but the mechanisms behind this behavior are not known. Previous studies in mouse embryonic stem cells have shown that the cdx genes are necessary for upregulating the gene sp5 which may be linked to axial elongation. Sp5 is a zinc-finger transcription factor belonging to the specificity protein (sp) family. Our group has used in-situ hybridization experiments on zebrafish embryos to show that sp5-like (sp5l) is transcribed within tailbud tissues that …

Electrochemical Reduction Of Carbon Dioxide Using Ruthenium And Amines, Sydney Moise

Honors Theses

With an increased concern for climate change in the recent years, a significant area of research has been devoted to the reduction of greenhouse gases. Carbon dioxide (CO2) resides in the atmosphere between 300 – 1000 years, making the reduction of the molecule a substantial field of study.1 Amines have been used as CO2 scrubbing agents in literature historically, due to their ability to form bonds to carbon.2 Although studies involving metal catalysts and amines have been reported numerous times, research involving chemical reduction of CO2 using purely amines is scarce. In this paper, amines, in addition to hydride donors …

Investigating The Helicase Activity Of Methylated Vs Unmethylated Ded1, Hannah Lukow

Honors Theses

Ded1 is an RNA helicase protein of the DEAD-box subfamily in eukaryotic organisms (Sharma & Jankowsky, 2014) which can act as an activator or initiation factor, during translation (Hilliker et al., 2011). Ded1 has several functions in yeast including assembly of translational initiation factors, scanning the mRNA for the start codon, and unwinding any double stranded segments of mRNA with its helicase ability. Ded1 was discovered to be methylated at four arginine sites in vivo (Low et al., 2013), with a fifth methylation site being discovered recently (Low et al., 2020), however the purpose of such post-translational modifications is still …

Analysis Of Wild Rodent Gut Microbiota As A Function Of Exposure To Ticks And Tick-Borne Pathogens, Joshua Pandian

Honors Theses

Due to advances in high-throughput parallel sequencing, researchers have conducted novel studies exploring relationships between microbiome compositions and different aspects of organism health. Some of these studies have shown that the gut microbiome of rodent models has effects on organism health and behavior and that infection with pathogens and the composition of the skin microbiome are linked to changes in gut microbiome composition. While previous studies have shown how vector microbiota impact vector behavior and pathogen transmission, the effect vectors have on reservoir species microbiomes has been a less prominent focus. We were interested in the relationships between tick parasitism, …

The Role Of Cerium(Iii) In Bacterial Growth And The Microbial Transformation Of Aromatic Hydrocarbons, Shruti Sathish

Honors Theses

Biofilms are communities of surface-attached bacterial cells encased in an exopolymeric matrix. In this state, they are more resistant to antimicrobial treatment and can have adverse effects in medical, agricultural, and industrial settings. Whereas, as biocatalysts, biofilms from nonpathogenic bacteria enhance their performance and stability in catalysis. Unfortunately, there are several challenges when using bacteria in organic transformations due to their complex cellular chemistry. Trivalent lanthanide metals were discovered to serve regulatory roles in some bacterial catalytic processes, including those of Pseudomonas putida KT2440 (P. putida), a non-infectious Gram-negative bacterium. The main goal of our research is to use cerium(III) …

Halogen Bonding: A Computational Chemistry Investigation Of The Interaction Between Thyroid Hormone And Deiodinase, William Rice

Honors Theses

Halogen bonding is a noncovalent interaction that continues to garner interest among the scientific community. Investigation of halogen bonds in biological contexts typically revolves around rational drug design for developing therapeutics. However, halogen bonding may be occurring naturally in our body every day. Thyroid hormone and its regulating enzyme, iodothyronine deiodinase, show promising results for a halogen bonding interaction that happens during catalysis. Prior work has examined the interaction between the iodine of thyroid hormone and the selenium of iodothyronine deiodinase. However, this study is the first of its kind to use computational chemistry methods to analyze the halogen bond …

Investigation Of The Effects Of Resveratrol And Epigallocatechin Gallate On Woodsmoke-Induced Inflammation, Sarenna Naomi Enright

Honors Theses

Until a few years ago, most scientific investigations related to the health effects of air pollution focused on outdoor air pollutants. But in recent years, the concerns over indoor air pollution has increased. People can spend up to 90% of their time in indoor environments, especially their homes, even more so since the beginning of the COVID-19 pandemic. The concentrations of some air pollutants are five times higher than what is found outdoors.

Indoor air pollution exposure remains a significant cause of morbidity and mortality worldwide. Approximately half of the global population is exposed to abnormally high concentrations of household …

Organizational Networking, Leadership, And Community Engagement: A Case Study Of The Revitalization Of An Impaired Watershed In Richmond, Virginia, Julia L. Roller

School of Professional and Continuing Studies Nonprofit Studies Capstone Projects

Green infrastructure is a necessary component of urban environments designed to mitigate climate instability and provide healthier living environments for urban residents. Discrimination and socio-economic status are some of the determining factors in the provision of green infrastructure, availability of green spaces, and outdoor programming available in urban communities. This paper describes an exploratory case study of the partnerships between municipal and nonprofit organizations involved in the revitalization of an impaired watershed in Richmond, Virginia. Preliminary findings suggest networking between agencies and nonprofits with strong mission alignment can increase organizational capacity by sharing specialized training and resources. Success may also …

American Bullfrog (Lithobates Catesbeianus) Diet In Uruguay Compared With Other Invasive Populations In Southern South America, Gabriel Laufer, Noelia Gobel, Mauro Berazategui, Matías Zarucki, Sofía Cortizas, Alvaro Soutullo, Claudio Martinez Debat, Rafael O. De Sá

Biology Faculty Publications

Between 2000-2020, more than ten new populations of the invasive American bullfrog (Lithobates catesbeianus) have been reported in the southern cone of South America. We studied the stomach contents of 126 bullfrogs from a population at an early invasion stage in Uruguay (Acegua, Cerro Largo Department). We observed a rich diet, with extensive prey volume range (1 mm3 to more than 7 000 mm(3)); the most frequent items were Hymenoptera (19.6%), Coleoptera (16.4%), Amphipoda (13.3%), Anura (8.9%) and Heteroptera (8.7%). Despite some overlap, differences were observed in volume (chi(2) = 54.6, p <0.001, d.f. = 2) and prey quantity (F = 8.1, p <0.001, d.f. = 79) between males, females, and juveniles. Juveniles showed significantly higher consumption of terrestrial prey by count (82% of their total ingestion) than adults (29% for males and 32% for females) (chi(2) = 28.5, p <0.001, d.f. = 2). Adults, especially females, showed a high frequency of cannibalism (33% of their total ingestion; chi(2) = 20.9, p <0.001, d.f. = 2). Comparing our data with other bullfrog regional studies, we found great plasticity in trophic habits and differences in the incidence of cannibalism (higher incidence in the populations of Acegua, Uruguay, and Buenos Aires, Argentina). These differences could be related to local biodiversity, but also could be affected by the invasion phase. Cannibalism frequency was higher in small bullfrog populations, where it could be favoring the establishment success. This shift in foraging strategies during the invasion process had been insufficiently evaluated in amphibians. Knowing the ecological determinants for the invasion by bullfrogs can be useful to the development of management strategies.

Human Population History At The Crossroads Of East And Southeast Asia Since 11,000 Years Ago, Tianyi Wang, Wei Wang, Guangmao Xie, Zhen Li, Xuechun Fan, Qingping Yang, Xichao Wu, Ling Qin, Fajun Li, Melinda A. Yang

Biology Faculty Publications

Past human genetic diversity and migration between southern China and Southeast Asia have not been well characterized, in part due to poor preservation of ancient DNA in hot and humid regions. We sequenced 31 ancient genomes from southern China (Guangxi and Fujian), including two ∼12,000- to 10,000-year-old individuals representing the oldest humans sequenced from southern China. We discovered a deeply diverged East Asian ancestry in the Guangxi region that persisted until at least 6,000 years ago. We found that ∼9,000- to 6,000-year-old Guangxi populations were a mixture of local ancestry, southern ancestry previously sampled in Fujian, and deep Asian ancestry …

Larval Chondrocranial And Internal Oral Morphology Of The Neotropical Treefrog Boana Crepitans (Wied-Neuwied, 1824; Amphibia, Anura, Hylidae), Marianna Isabella Rosa Rodrigues De Oliveira, Luiz Norberto Weber, Johnny Sousa Ferreira, Anna Evelin Coimbra Liborio, André Masahide Guimaraes Takazone, Rafael O. De Sá

Biology Faculty Publications

We describe the internal oral morphology and chondrocranial anatomy for Boana crepitans tadpoles, and compare them with available descriptions for other species in the subfamily Cophomantinae. Among species of the Boana faber group, the chondrocranial anatomy has been reported only for one species internal oral morphology and cranial anatomy are similar to other described species of Boana and Cophomantinae. B. crepitans lacks unique features in the oral cavity and chondrocranium that would distinguish it from other congeneric species. We identify six characters from the internal oral anatomy of tadpoles unique for Cophomantinae. In addition, Boana has infralabial papillae projections, buccal …

Research Towards Understanding Hox Regulation By Cdx, Joshua M. Fisher

Honors Theses

In this project, we aim to functionally test the contribution that individual Cdx binding sites have in hox gene regulation. We will achieve this by individually blocking Cdx binding sites using CRISPR/dCas9 in the zebrafish and then analyzing changes in the time, distribution, and levels of hox gene transcription.

We will focus our analysis in only one of the seven zebrafish hox clusters, the hoxca cluster. We are focusing on the hoxca gene cluster because it has lost the least number of genes relative to other clusters and is involved in specifying the axial identity of cells in …

Investigation Of The Effects Of Curcumin On Woodsmoke-Induced Inflammation, Melissa Lewis

Honors Theses

Inflammatory diseases caused by biomass smoke exposure and indoor air pollution affect millions of people worldwide. These diseases can be caused by the burning of biomass (plastic, wood, rubber, tobacco, etc.) for light or heat. Acrolein is a common indoor and outdoor pollutant from tobacco smoke or organic combustion. Wood smoke is hypothesized to cause inflammation since it contains high concentrations of particulate matter and gaseous compounds and are similar in size to other well-known damaging particles. Natural remedies, like curcumin, are hypothesized to be a natural remedy for combating inflammation. The goal of this research was to investigate the …

The Effect Of Color Morph On Behavior Interactions In Red-Backed Salamanders (Plethodon Cinereus), Taylor M. Aliferis

Honors Theses

Studies in behavioral ecology provide critical information regarding a species’ territoriality, predator-prey interactions, and reproduction. Red-backed salamanders (Plethodon cinereus) are a polymorphic terrestrial amphibian whose behavioral interactions have long been studied to provide insights on the processes that structure salamander populations, which are often cryptic and difficult to study. However, research regarding the effect of coloration on these interactions is more limited, but potentially extremely important for studies of population dynamics and speciation in terrestrial salamanders. In this study, aggressive and submissive behaviors of adult male red-backed salamanders in five different color morph treatment pairings were observed to …

Characterization Of A Myo19 Knockdown Phenotype In A Cultured Neuron-Like Cell Line, Adelaide Masterson, Bridget Wolters

Arts & Sciences Student Symposium

We will be characterizing and analyzing properties related to neurite outgrowth, including neurite length & mitochondrial dynamics, in order to understand how MYO19 activity and mitochondrial distribution play a role in neurite development. We aim to observe if loss of MYO19 expression alters these properties, and if reintroducing specific aspects of MYO19 function can “rescue” any observed defects in cells where normal MYO19 expression has been lost. Our studies and hypothesis are based on the previous work of Dr. Quintero and his students, where they have observed differences in the behavior of neuron-like CAD cells when MYO19 expression has been …

Covid-19 And Campus Life: Student Perspectives, Ryan Shah

Osmosis Magazine

The COVID-19 pandemic has caused unprecedented changes to campus life as students have adjusted to the hybrid class model and physical distancing framework. Simply residing on campus this semester has been a privilege; many Spiders, especially international students and students with pre-existing health conditions, could not come at all. Among students on campus, there are varying attitudes about how this semester of “Protecting Our Web” has gone. To document this historic semester, I interviewed three students in mid- October:

• Colin Sparkevicius, a senior from Pennsylvania majoring in business administration
• Tereza Hernandez, a sophomore from Virginia majoring in global studies
• Karthik …

“A Fitbit For Your Brain”-Elon Musk, Sci-Fi Or Attainable?, Ryan Cvelbar

Osmosis Magazine

Just a couple months ago, Elon Musk, the CEO of Tesla, SpaceX, and now Neuralink, debuted his enhanced design of the Neuralink, a wireless brain implant the size of a coin, which he plans to use to ultimately facilitate the achievement of a state of symbiosis between humans and artificial intelligence. Specifically, Musk envisions a world where we can control technology with our minds by connecting the neurons of our brains to the Neuralink and hence, digitally to computers.

We’Ve Got Your Back: New Studies In Spinal Cord Regeneration, Joshua Pandian

Osmosis Magazine

Every day, the spinal cord transmits messages between the brain and body at speeds of 270 miles per hour. The spinal cord allows us to walk, run, or swim. However, for 200,000 Americans who suffer from spinal cord injury (SCI), simply standing up is often not a possibility. This number rises by approximately 17,000 cases a year as a result of sports injuries, car accidents, motorcycle collisions, or falls. Unlike many cells in the body, the neurons in the spinal cord cannot regenerate after an injury, which means spinal cord injuries tend to last for the remainder of one’s lifetime.

Salmonella: Clever Bacteria, Najnin Rimi

Osmosis Magazine

A recent outbreak of salmonella caused many grocery stores to recall their onions and many unknowing consumers to become ill. A major produce supplier from California, Thompson International Inc., had announced a recall on August 1st for all onion types distributed by the company starting May 1st of 2020. This caused a recall from over hundreds of grocery stores, even our familiar Kroger and Walmart grocery stores.

Passive Antibody Therapy: Potentially The First Covid-19 Treatment, Caterina Erdas

Osmosis Magazine

While the world anxiously waits for a COVID-19 vaccine, thousands of people are in critical condition, in need of help today. Scientists are wondering what tools they have now to prevent the spread of COVID-19 and help save the lives of patients in critical condition. Passive antibody therapy may be the solution.

Illuminating Health Disparities: The Untold Story Of Black Women’S Pregnancies, Kacy Workman

Osmosis Magazine

Recent studies have found that Black women are 3-4 times more likely to die from pregnancy-related complications than White women. Researchers in the 1990s examined data surrounding specific pregnancy complications such as postpartum hemorrhage, finding that although prevalence rates were similar between White and Black women, Black women with these conditions were 2-3 times more likely to die than their White counterparts. Despite medical advances, these rates have not improved over time. Data analyses examining maternal mortality from 2005 – 2014 reveal that mortality rates for Black women have actually increased from 39 to 49 deaths for every 100,000 live …

Ai And Art: An Increasingly Inextricable Affair, Rebecca Hedlund

Osmosis Magazine

Siri, Waze, Google Translate, Instagram -- we experience Artificial Narrow Intelligence (ANI) every day of our lives when we use apps that are trained for a specific task, such as when Spotify recommends new songs based on the music you already like. These apps compute the data users give (whether knowingly or not) and adjust their own algorithms to provide the best possible experience. This is an application of Artificial Intelligence called machine learning. While some see it as a subset of AI, many argue that the ability to learn and improve through experience is critical to the very definition …

The Benefits Of Reading On Longevity, Olivia Lomax

Osmosis Magazine

What if I told you there is a scientifically proven way of adding time to your life that is as simple as reading a few chapters of your favorite book? A study performed at Yale University School of Public Health compared the longevity of people who read books to those who only read periodicals. Those conducting the study predicted that the book-readers would have increased levels of survival, as reading books has been shown to promote two distinct cognitive properties tied to longevity.

Letter From The Editor, Ryan Shah

Osmosis Magazine

Letter form the Editor-in-Chief, Ryan Shah.

Osmosis - Fall 2020

Osmosis Magazine

Osmosis is a student read, led, and written publication from the University of Richmond, focusing on all aspects of healthcare and science.

Is Medecine Losing Money?, Garrett Lang

Osmosis Magazine

It is no secret that modern medicine has improved people’s lives in virtually every are of healthcare. What is also not a secret is how expensive it is. . Not only does the average American spend roughly $5000 on healthcare, they also spend roughly $1200 on pharmaceuticals. The candidates gunning for the U.S. presidency often bring up the topic of rising pharmaceuticals and what they would do to change it. Medical services and products as a whole are of concern for virtually all Americans, and many of them are considered overpriced. The development of these products isn’t cheap, and it …

Our Future In A 3-D Printer, Ryan Cvelbar

Osmosis Magazine

CareCloud, a privately held technology company headquartered out of Miami, states that according to recent figures, the average cost of an organ transplant in the U.S. can reach well over $1 million. Furthermore, according to the United Network for Organ Sharing (UNOS), more than 113,000 patients in the U.S. are currently waiting for an organ transplant. Anne Paschke of UNOS stresses this need for organs by expressing that only 1 to 2 percent of the population dies in a way that makes them potential organ donors. Although the need for organs has yet to be met, bioprinting has the potential …