Institutional Repository
The UDSpace Institutional Repository collects and disseminates research material from the University of Delaware.
- Faculty, staff, and graduate students can deposit their research material directly into UDSpace. Faculty may use UDSpace to fulfill the University of Delaware Faculty Senate Open Access Resolution, and in many cases may use it to fulfill open access requirements from grant funding agencies.
- Departments can use UDSpace to publish or distribute their working papers, technical reports, or other research material.
- UDSpace also includes all doctoral dissertations from winter 2014 forward, and all master's theses from fall 2009 forward.
To learn more about UDSpace, and how you can make your research openly accessible to the public, visit our UDSpace Policies website.
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Recent Submissions
The regulation of public sector collective bargaining in Delaware
(University of Delaware, 1976) Hsu, Linda
Sodium intake and biological sex influence urinary endothelin-1 in salt-resistantadults: a pilot study
(American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 2025-08-19) Nasci, Victoria L.; Benjamin, Jazmine I.; Stock, Jseph M.; Romberger, Nathan T.; Watso, Joseph C.; Babcock, Matthew C.; Wenner, Megan M.; Robinson, Austin T.; Gohar, Eman Y.
Hypertension is more prevalent in males than age-matched premenopausal females. Average sodium intake in the United States ishigher than recommended and is a risk factor for developing hypertension. Sex differences in renal sodium homeostasis may underliesex differences in hypertension prevalence. For example, renal endothelin-1 (ET-1) plays a key role in the maintenance of blood pres-sure and sodium homeostasis. Previous rodent studies demonstrate that females excrete higher urinary ET-1 compared with males,and increasing dietary sodium promotes urinary ET-1 excretion only in male rats. However, the impact of sex on sodium and renal ET-1 signaling in humans is unclear. Therefore, we aimed to determine whether the renal ET-1 system responds differently to salt loadingin male and female human research participants. To test our hypothesis, normotensive salt-resistant male and female participantswere administered a low (1 g/day), recommended (2.3 g/day), and high (7 g/day) sodium diet for 10 days each in random order. The24-h urine samples were collected and assessed for sodium and ET-1. Following increased dietary sodium, both males and femalesincreased urinary sodium excretion (diet: P < 0.001). Following increased dietary sodium, participants exhibited an increased urinaryET-1 excretion (diet: P ¼ 0.038). Interestingly, post hoc testing revealed that only females displayed an increase in ET-1 excretion (rec-ommended vs. high sodium, P ¼ 0.009). Overall, the current human study provides novel insights into potential sex-specific modula-tion of ET-1 and renal responses to dietary sodium. Further investigations are warranted to understand the underlying molecularmechanisms driving sex-related differences in renal ET-1 signaling and sodium handling.
The Wilmington Boarding School for Girls
(University of Delaware, 1961) Hodges, Margaret Hill
The subject of research for my thesis is the Wilmington Boarding School for Girls. This highly successful institution existed for some fifty years of the nineteenth century and offered an outstanding education for its day. Well over a thousand girls attended it, both boarding and day students, and they included not only local girls, presenting many of Wilmington's leading families, but a sizable number from neighboring states and even states farther away. ☐ My study includes an investigation into the lives of those who conducted the Wilmington Boarding School, especially Samuel and Eli Hilles, who were prominent citizens of the community for many years, as well as Madame Capron, Joshua Maule, John M. Smith, and Martha and Dubré Knight. I have also surveyed American secondary education during the first half of the nineteenth century, and in particular, schools for young ladies. Of particular interest were the private schools for girls which were operated in Wilmington during that period. ☐ In considering the Wilmington Boarding School for Girls, Ihave undertaken and examination of the school's curriculum and compared it with that of other girls' schools of the time, as well as investigating the methods and materials of instruction. I have also attempted to gather as much information as possible about the pupils and their homes, and about the teachers and their background. ☐ My research has centered on local sources of information, namely the Memorial Library of the University of Delaware, the Wilmington Institute Free Library, the Historical Society of Delaware, and the Wilmington Friends Meeting records. I have had correspondence with several descendants of Samuel Hilles, and visited one in New Hope, Pennsylvania. It is possible that additional material might be found at Haverford College or through the records of the Society of Friends in Philadelphia or Swarthmore, but I was unable to consult these sources at the present time. I do believe that I have unearthed and examined about all the material available concerning the Wilmington boarding school for girls in and around this city.
Biases in Perceiving Positive Versus Negative Emotions: The Influence of Social Anxiety and State Affect
(Vision, 2025-11-01) Ciaramitaro, Vivian M.; Morina, Erinda; Wu, Jenny L.; Harris, Daniel A.; Hayes-Skelton, Sarah A.
Models suggest social anxiety is characterized by negative processing biases. Negative biases also arise from negative mood, i.e., state affect. We examined how social anxiety influences emotional processing and whether state affect, or mood, modified the relationship between social anxiety and perceptual bias. We quantified bias by determining the point of subjective equality, PSE, the face judged equally often as happy and as angry. We found perceptual bias depended on social anxiety and state affect. PSE was greater in individuals high (mean PSE: 8.69) versus low (mean PSE: 3.04) in social anxiety. The higher PSE indicated a stronger negative bias in high social anxiety. State affect modified this relationship, with high social anxiety associated with stronger negative biases, but only for individuals with greater negative affect. State affect and trait anxiety interacted such that social anxiety status alone was insufficient to fully characterize perceptual biases. This raises several issues such as the need to consider what constitutes an appropriate control group and the need to consider state affect in social anxiety. Importantly, our results suggest compensatory effects may counteract the influences of negative mood in individuals low in social anxiety.
The disfranchisement of the Delaware Negros in the late nineteenth century
(University of Delaware, 1965) Hiller, Amy McNulty