Digital Commons Network^™

Development And Validation Of Green Stability-Indicating Rp-Hplc Method For Estimation Of Ertapenem: Degradation Kinetics And Structural Mass Elucidation Using Ms, Sohair M. Aboelghar, Hebatallah A. Wagdy, Maha A. Hegazy

Pharmacy

Ertapenem is an antibiotic that is used in the treatment of several bacterial infections, and it was recently approved for the treatment of the COVID-19 virus. A simple validated stability-indicating reversed phase High Performance Liquid Chromatographic (RP-HPLC) method was developed for ertapenem estimation. The separation was done using Pronto SIL® C18 (300 × 4.6 mm, 5 μm) as the stationary phase, methanol, and acidified water as the mobile phase in gradient mode with a flow rate of 1 mL/min and a pH 4.0 adjusted by orthophosphoric acid. The method was validated according to ICH guidelines. The linearity ranges from 5.00-120.00 …

Exploring The Pre- And Post-Pandemic Connection Between The Plus School Climate Survey And Student Outcomes: A Comparative Analysis And Predictive Study, Sarah V. Neely

University of the Pacific Theses and Dissertations

The return to in-person schooling post-COVID-19 pandemic has brought increased pressure on educators to ensure academic success for students. This study examines the school climate of 40 elementary and middle schools in California's Central Valley and its impact on academic performance and attendance, comparing pre-pandemic (2018-2019) with post-pandemic (2021-2022 and 2022-2023) data. Additionally, the study explores the influence of positive student-teacher relationships on academic outcomes and chronic absenteeism. Utilizing the PLUS School Climate Survey, this research sought to identify significant differences in survey scores pre- and post-pandemic, as well as examining the predictive power of student-teacher connectedness on academic performance …

Transforming Land And Home Ownership: Emergent Strategy And Community Cultural Wealth In Developing Community Land Trusts, Ahmed Naguib

University of the Pacific Theses and Dissertations

This dissertation investigates the transformative potential of Community Land Trusts (CLTs) in reimagining land and homeownership within the context of capitalist real estate markets. Utilizing a qualitative research framework that combines narrative inquiry with Emergent Strategy and Community Cultural Wealth theories, this study explores the intricacies of developing CLTs as a counter-narrative to traditional models of property ownership. Through extensive narrative analysis of four distinct CLTs in California, this research highlights the complex challenges and innovative strategies employed to scale CLTs in competitive urban markets. The findings reveal how CLTs leverage emergent strategy and community cultural wealth to navigate and …

The Decline Of Science In The Early Years: A Diagnosis And A Plan Of Action, Jennifer Bentley

University of the Pacific Theses and Dissertations

Science instruction in the early years of a student’s education career is essential to a student successfully continuing science in their secondary and postsecondary careers. However, the amount of high-quality science instruction students receive at the elementary level has been steadily declining for two decades, resulting in an inequitable imbalance in those who pursue STEM careers, a lack of critical science literacy in the U.S. populace, and a shortage of qualified employees entering the U.S. economy. Much of the lack of science instruction can be traced to decreased training of teachers to teach science during elementary credentialing programs or the …

Nutrition Counseling Practices Among Psychologists, Wibecke Stromsnes

University of the Pacific Theses and Dissertations

There is a lack of treatment guidelines for how to address the impact of nutrition on clients’ mental health. Prior research is limited regarding psychologists’ practices of nutrition counseling and has mostly focused on practices of dieticians and medical doctors. The purpose of this study was to examine psychologists’ beliefs and attitudes about nutrition counseling, amount of training and use of nutrition counseling, self-rated knowledge in the use of nutrition counseling and perceived benefits and barriers to using nutrition counseling. Data was collected using an online survey of 76 licensed psychologists’ training in nutrition and use of nutrition counseling. Findings …

Analyzing Sex Differences In Human Performance Through 3d Isotonic Resistance, Jacob M. Cunha

University of the Pacific Theses and Dissertations

Appraisal of scientific literature and understanding continues to grow in the domain of human performance. The effects of sex on concentric resistance training and power output are not well understood. Recent advancements in technology permit more precise measurements of force output and the kinematic changes elicited by training stress. A unique device in capturing kinematic performance output is Proteus Motion. The machine produces an external magnetic load through a protruding apparatus connected to a gyrosphere, which in turn captures concentric movement through all three planes of movement (sagittal, coronal, transversal). The aim of this study is to investigate power output …

Quantitative Shotgun Proteomic Analysis Of Bacteria After Overexpression Of Recombinant Spider Miniature Spidrion, Masp1, Kathryn P. Randene

University of the Pacific Theses and Dissertations

Spider silk has extraordinary mechanical properties, displaying high tensile strength, elasticity, and toughness. Given the high performance of natural fibers, one of the long-term goals of the silk community is to manufacture large-scale synthetic spider silk. This process requires vast quantities of recombinant proteins for wet-spinning applications. Attempts to synthesize large amounts of native size recombinant spidroins in diverse cell types have been unsuccessful. In these studies, we design and express recombinant miniature black widow (Latrodectus hesperus) MaSp1 spidroins in bacteria that incorporate the NTD and CTD, along with varying numbers of codon-optimized internal block repeats. Following spidroin overexpression, we …

Synthesis Of Hydroxycinnamate Derivatives And Characterization Of Bioactivity As Radical Scavengers And Α-Glucosidase Inhibitors, Cate Simmermaker

University of the Pacific Theses and Dissertations

Hydroxycinnamic acids (HCAs), a class of polyphenols commonly found in regularly consumed fruits and vegetables, have been investigated for efficacy as radical scavengers and glycosidase inhibitors. These compounds could mitigate the negative health effects of free radicals in oxidative stress diseases including neurodegeneration, cancer and diabetes. The HCAs investigated were caffeic acid (1), p-coumaric acid (2), ferulic acid (3), and sinapic acid (4). The compounds were derivatized with synthetically prepared amino acid esters through a four-step synthesis including protective acetylation, chlorination of the carboxylic acid, amidation, and subsequent deprotection of all applied protecting groups. The inclusion of diverse derivative groups …

Evaluating The Effects Of Self-Monitoring On Physical Activity Within A Health Coaching Package, Morgan E. Valois

University of the Pacific Theses and Dissertations

The World Health Organization recommends that adults engage in at least 150 minutes of moderate to vigorous physical activity every week. Engaging in physical activity improves long-term health, unfortunately, half of the adults in the United States do not meet the recommended levels. Health coaching is a patient-oriented approach to deliver behavior change interventions that has been shown to increase physical activity and improve health outcomes. Self-monitoring is a component of health coaching, and is a behavior change technique that has been identified as an integral component of health interventions that resulted in improved health outcomes. However, the specific effects …

An Empirical Predictive Model For Determining The Aqueous Solubility Of Bcs Class Iv Drugs In Amorphous Solid Dispersions, Sridivya Raparla

University of the Pacific Theses and Dissertations

Poor aqueous solubility persists as a significant challenge in the pharmaceutical industry.Ongoing research aims to enhance the solubility of drugs to deliver them more effectively. Amorphous solid dispersion (ASD) is a widely used solubility enhancement technique. The absence of a specific model to predict compound solubility from ASDs resulted in a trial-and- error approach to studying solubility enhancement and makes it a laborious and time-consuming process. Predictive models could streamline this process and accelerate the development of oral drugs with improved aqueous solubilities. This study aimed to develop a predictive model to estimate the solubility of a compound from the …

Supporting At-Risk Students Through The Interconnected Systems Framework: Perspectives Of Specialized Instructional Support Personnel, Luis Angel Sandoval

University of the Pacific Theses and Dissertations

The number of students with mental health challenges has increased significantly in public schools during the past 10 years. Despite school and community efforts many students remain underserved, specifically at-risk populations. At-risk youth are more likely to experience adverse life outcomes such as performing poorly in school, dropping out of school, acting violently, and facing higher instances of mental health challenges when compared to peers with fewer risk factors. The purpose of this qualitative study was to examine specialized instructional support personnel’s attitudes and willingness to implement a change model, ISF, to support at-risk youth in the public school system. …

Structural And Functional Studies Of The Human Members Of The Macrophage Migration Inhibitory Factor Family, Andrew Parkins

University of the Pacific Theses and Dissertations

Macrophage migration inhibitory factor (MIF) and D-dopachrome tautomerase (D-DT) are the two human members of the MIF superfamily, which are implicated in an array of autoimmune disorders, inflammatory diseases, and cancer via their pleiotropic functionality. Despite only sharing 34% sequence identity, MIF and D-DT have high structural homology and overlapping functional traits, including activation of the type II cell surface receptor CD74 and keto-enol tautomerase activity. The MIF and/or D-DT-induced activation of CD74 leads to signaling cascades pivotal for cell growth, proliferation, and inhibition of apoptosis. Such characteristics make MIF and D-DT attractive molecular targets for drug discovery.

Currently, all …

From Elementary School To Doctoral Education: An Autoethnographic Journey, Gwendolyn D. Dailey

University of the Pacific Theses and Dissertations

Every child has a right to education, and their skin color should not determine their education quality. However, since the landmark case of Brown v. Board of Education (1954), it has been proven that race continues to matter in the success and failure of education (Delgado & Stefancic, 2001). The persistent achievement gaps between students of different racial and ethnic backgrounds, as well as the disparities in access to high-quality educational opportunities, demonstrate how race and ethnicity shape the educational experiences of students of color (Stanford Center for Education Policy Analysis, 2012). Unfortunately, stories such as Ruby Bridges of New …

Elaboration Of Diquinanes To Access Trifunctional Angular Triquinanes And Designed Dna Polymerase Α Inhibitors, Spencer M. Webber

University of the Pacific Theses and Dissertations

Natural products are of great significance to the pharmaceutical industry in the development of new drugs. Diquinane or bicyclo[3.3.0]octane is a conspicuous structural unit existing in the carbo-frameworks of a wide range of natural products such as alkaloids and terpenoids. These diquinane-containing molecules not only exhibit intriguing architectures, but also showcase a broad spectrum of significant bioactivities, which draw widespread attention from the global synthetic community. A more specific group of compounds containing a diquinane moiety with one extra 5-membered ring are called the angular triquinanes.In this work, we have developed a general synthetic scheme to the angular triquinanes. We …

Impact Of A Culturally-Grounded And Interprofessional Approach To Managing Latino/Hispanic Patients At Risk For Or Diagnosed With Type 2 Diabetes Mellitus: A Pilot Study, Jahnavi Yalamanchili

University of the Pacific Theses and Dissertations

Background: Despite significant progress in diabetes research, there remain significant health disparities between Hispanic/Latino patients in the United States, particularly those with lower socioeconomic status, compared to non-Hispanic white patients. Previous studies have identified potential reasons behind these disparities, including the need for a multifaceted approach that addresses social determinants of health (SDOH) faced by patients. Social cognitive theory (SCT) stipulates that interventions that promote self-management by improving knowledge, self-efficacy, and problem-solving skills can be successful in improving health outcomes. However, there is a paucity of studies that have evaluated an interprofessional approach to providing culturally relevant care, in particular …

Effects Of Glyphosate-Based Herbicide Exposure On Life History, Stress Tolerance, And Microbiome—From Plasticity To Evolution, Jacob R. Whitlock

University of the Pacific Theses and Dissertations

Glyphosate (GLY) is the most used pesticide worldwide, and GLY-based herbicides (GBHs) can affect animals’ microbiomes and, in turn, their physiology and morphology. Environmental stressors can be mitigated by flexibility in life-history strategies, which can also dictate animal physiology and morphology. However, we lack an understanding of how GBH influences life-history strategies and stress tolerance, in addition to its effects across generations. Thus, I exposed the variable field cricket, Gryllus lineaticeps, to GBH within- and across-generations to examine the role of GBH in developmental plasticity and evolution. Specifically, I measured its effects on life-history traits (e.g., developmental duration and a …

The Role Of The Unfolded Protein Response In Fatty Liver Disease, Anusha L. Murshed

University of the Pacific Theses and Dissertations

The unfolded protein response (UPR) is composed of three highly conserved pathways (ATF6, IRE1, PERK). Cellular stressors induce protein misfolding and aggregation in the endoplasmic reticulum (ER). This signaling pathway maintains protein homeostasis when there is stress in the ER. When the UPR is activated, the eukaryotic initiation factor 2 alpha (eIF2α) becomes phosphorylated, which inhibits global mRNA translation. If ER stress remains chronically unmitigated, the UPR induces apoptosis. GADD34 and CReP shift in expression when the UPR is activated and work as phosphatases and dephosphorylate eIF2α in a feedback loop, allowing protein synthesis to resume. Several human diseases, including …

Impact Of Drug-Polymer Interactions On Stability In Simvastatin-Based Amorphous Solid Dispersions, Charina Lampa

University of the Pacific Theses and Dissertations

This study aimed to investigate the drug-polymer interactions between simvastatin (SIM) and three polymers [PVP-VA, HPMC-AS, and Soluplus® (SOL)] in amorphous solid dispersions (ASDs) prepared by hot melt extrusion (HME), and to understand the implications on physical stability. ASDs are of significant interest within the pharmaceutical industry for improving drug bioavailability. However, the amorphous nature of a drug in an ASD presents physical stability challenges. Utilizing novel applications of accessible tools such as ATR-FTIR or DSC aid in understanding the mechanisms of stabilization which are critical to the rational design of ASDs. ASDs were prepared using HME and were characterized …

Close To The Pain: Alternative Education And The Unheard Voices Of Young Adults’ Transformative Learning Experiences, Vicki Lynn Lock

University of the Pacific Theses and Dissertations

This dissertation focuses on amplifying the voices of marginalized students in alternative education, with an emphasis on the positive impact of resilience on their outcomes. The study addresses the challenges these students face, particularly those from BIPOC communities, in navigating educational systems that have historically marginalized them. The purpose of this qualitative research was to explore the experiences of BIPOC students in a Central Valley alternative education program, highlighting how nurturing relationships, resilience, and the fulfillment of basic needs contribute to their academic success and personal growth. Utilizing a framework that incorporates theories of resilience, educational equity, and transformative leadership, …

Filipina American Mothers’ Experiences Obtaining Services For Their Children With Autism Spectrum Disorder, Nina Chelle Boling

University of the Pacific Theses and Dissertations

Autism spectrum disorder (ASD) is a multifaceted developmental condition that manifests in early childhood, affecting various aspects of neurologic, biological, adaptive, social, linguistic, and cognitive functions. A timely and accurate diagnosis of ASD is crucial for effective intervention, promoting personal and social growth, and fostering independent adulthood. However, obtaining this diagnosis can pose challenges, particularly for people of color, who often encounter disparities in healthcare access compared to their White counterparts. This study aims to investigate the experiences of Filipina mothers raising children with ASD, specifically focusing on their journey to access appropriate autism services.

As of 2019, there were …

On The Social Validity Of Teaching Children To Give A Polite Response, Nancy V. Ramirez

University of the Pacific Theses and Dissertations

Some children, including individuals diagnosed with autism spectrum disorder (ASD), may respond rudely when expressing their opinions about nonpreferred gifts or aspects of someone else’s appearance (Bergstrom et al., 2016; Saarni, 1984; Talwar et al., 2007; Xu et al., 2010). One proposed solution discussed in the literature to decrease rude responses in children involves teaching children to tell a socially appropriate lie, often referred to as prosocial lies, as an alternative response. These types of lies are defined as “lies that have some benefit for the lie recipient and are not intended to cause harm to another individual” (Popliger et …

Plasticity In Response To Temperature Magnitude And Variation---From Life History To Thermal Tolerance And Coloration, Austin Rex Hoffman

University of the Pacific Theses and Dissertations

Warming associated with climate change has many direct and downstream effects on animals. For example, warmer developmental temperatures can improve heat tolerance and reduce insect melanization, which is related to coloration, thermoregulation, immunity, desiccation resistance, and potentially life-history traits, such as investment into reproduction and dispersal. Increased temperature variation is also a feature of climate change, and it may have a larger impact on animals than warming. However, I lack insight into the combined effects of temperature magnitude and variability on important traits of life history, thermal tolerance, and coloration. Thus, I integrated temperature variation into thermal performance using a …

The Effect Of Breathing Hypoxic Gas (15% Fio2) On Physiological And Behavioral Outcomes During Simulated Driving In Healthy Subjects, Jaspreet Kaur, Lebbathana Manokaran, Michael Thynne, Mirza M.F. Subhan

School of Biomedical Sciences

Hypoxia is mainly caused by cardiopulmonary disease or high-altitude exposure. We used a driving simulator to investigate whether breathing hypoxic gas influences driving behaviors in healthy subjects. Fifty-two healthy subjects were recruited in this study, approved by the Science and Engineering Ethical Committee. During simulated driving experiments, driving behaviors, breathing frequency, oxygen saturation (SpO 2 ), and heart rate variability (HRV) were analyzed. Each subject had four driving sessions; a 10-min practice and three 20-min randomized interventions: normoxic room air (21% FIO 2 ) and medical air (21% FIO 2 ) and hypoxic air (equal to 15% FIO 2 ), …

Short- And Midterm Outcomes Of Off- And On-Pump Coronary Artery Bypass In Patients With A Mean Age Of 65 Or More: Systematic Review And Meta-Analysis, Jake Trotman, Toluwalase Eboka, Neil Smart, Nicola King

School of Biomedical Sciences

Background. Advancing age is a nonmodifiable risk factor for the development of coronary artery disease. Furthermore, patients >65 years old are considered at high risk for coronary artery bypass grafting (CABG). The aim of this study was to investigate whether there were any differences in clinical outcomes for patients with a mean age ≥65 undergoing CABG on or off pump. Methods. Systematic searches were conducted in EMBASE, PubMed, Web of Science, and Cochrane Central Registry of Controlled Trials (CENTRAL). The key search terms used were "cardiopulmonary bypass"OR "On pump"AND "off pump"OR "beating heart"AND "coronary artery bypass grafting"OR "CABG"AND "age."This was …

Editorial: Bacteriocins And Other Ribosomally Synthesised And Post-Translationally Modified Peptides (Ripps) As Modulators Of The Microbiome, Harsh Mathur, Des Field, Caitriona Guinane, Maire Begley, Mathew Upton, Hilario C. Mantovani, Paul D. Cotter

School of Biomedical Sciences

No abstract provided.

Double Testing With Lateral Flow Antigen Test Devices For Covid-19: Does A Second Test In Quick Succession Add Value?, Matthias E Futschik, Sarah A Tunkel, Elena Turek, David Chapman, Zareen Thorlu-Bangura, Raghavendran Kulasegaran-Shylini, Edward Blandford, Andrew Dodgson, Paul E Klapper, Malur Sudhanva, Derrick Crook, John Bell, Susan Hopkins, Tim Peto, Tom Fowler

School of Biomedical Sciences

BACKGROUND/OBJECTIVES: We investigated if performing two lateral flow device (LFD) tests, LFD2 immediately after LFD1, could improve diagnostic sensitivity or specificity for detecting severe acute respiratory syndrome-related coronavirus 2 (SARS-CoV-2) antigen.

STUDY DESIGN: Individuals aged ≥16 years attending UK community testing sites (February-May 2021) performed two successive LFD tests and provided a nose-and-throat sample for a polymerase chain reaction (PCR) test. Using the PCR result as the reference diagnosis, we assessed whether improvements could be achieved in sensitivity (by counting a positive result in either LFD as a positive overall test result) or specificity (by using LFD2 as confirmatory test). …

Rapid Antigen Testing For Sars-Cov-2 By Lateral Flow Assay: A Field Evaluation Of Self- And Professional Testing At Uk Community Testing Sites, Matthias E Futschik, Samuel Johnson, Elena Turek, David Chapman, Simon Carr, Zareen Thorlu-Bangura, Paul E Klapper, Malur Sudhanva, Andrew Dodgson, Joanna R Cole-Hamilton, Nick Germanacos, Raghavendran Kulasegaran-Shylini, Edward Blandford, Sarah Tunkel, Timothy Peto, Susan Hopkins, Tom Fowler

School of Biomedical Sciences

BACKGROUND: The advent of lateral flow devices (LFDs) for SARS-CoV-2 detection enabled widespread use of rapid self-tests during the pandemic. While self-testing using LFDs is now common, whether self-testing provides comparable performance to professional testing was a key question that remained important for pandemic planning.

METHODS: Three prospective multi-centre studies were conducted to compare the performance of self- and professional testing using LFDs. Participants tested themselves or were tested by trained (professional) testers at community testing sites in the UK. Corresponding qRT-PCR test results served as reference standard. The performance of Innova, Orient Gene and SureScreen LFDs by users (self) …

Loss Of The Scavenger Receptor Marco Results In Uncontrolled Vomocytosis Of Fungi From Macrophages, Chinaemerem U. Onyishi, Yusun Jeon, Gyorgy Fejer, Subhankar Mukhopadhyay, Siamon Gordon, Robin C. May

School of Biomedical Sciences

Vomocytosis, also known as nonlytic exocytosis, is a process whereby fully phagocytosed microbes are expelled from phagocytes without discernible damage to either the phagocyte or microbe. Although this phenomenon was first described in the opportunistic fungal pathogen Cryptococcus neoformans in 2006, to date, mechanistic studies have been hampered by an inability to reliably stimulate or inhibit vomocytosis. Here we present the fortuitous discovery that macrophages lacking the scavenger receptor MAcrophage Receptor with COllagenous domain (MARCO), exhibit near-total vomocytosis of internalised cryptococci within a few hours of infection. Marco^−/− macrophages also showed elevated vomocytosis of a yeast-locked C. albicans strain, …