Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Theses and Dissertations

Discipline
Institution
Keyword
Publication Year

Articles 781 - 810 of 5148

Full-Text Articles in Entire DC Network

Trust In Integrated Medical Care Using A Population-Based Normative Approach, Heather Summers Jan 2023

Trust In Integrated Medical Care Using A Population-Based Normative Approach, Heather Summers

Theses and Dissertations

The role of integrated care partnerships in addressing health care and social needs to achieve whole person care is important as health care costs rise and quality of care outcomes are incentivized. Medicaid reform and 1115 Medicaid waiver programs are implemented statewide as innovative programs aimed at achieving cost savings and improved clinical quality of care outcomes. Understanding how cross sector partnerships can meet the needs of individuals through integrated care cross sectoral coordination between government, social services and managed care is needed. This research study examined the role of normative care values, vision, trust, shared care, and leadership. The …


Provider Racial Concordance And Medical Mistrust In Pediatric Dentistry, Chinelo Eke Jan 2023

Provider Racial Concordance And Medical Mistrust In Pediatric Dentistry, Chinelo Eke

Theses and Dissertations

Purpose: Studies have drawn varying conclusions on the importance of a racially concordant patient provider relationship. Medical mistrust has continued to garner attention as healthcare enterprises thread equity, diversity and inclusion throughout their organizational policies, practices and systems.

Methods: Parents/caregivers of pediatric patients at VCU Pediatric Dentistry were invited to participate. Surveys included questions about demographics, racial concordance, language preference, and the validated Group-Based Medical Mistrust Scale.

Results: A total of 246 guardians completed the survey. For guardians, 40% reported Black or African American, 31% Hispanic, and 19% Caucasian. Seventy-one percent of guardians reported speaking English, 18% Spanish, and 11% …


The Age And Primary Reason For The First Dental Visit In Children With Special Health Care Needs, Amanda Dickerson Jan 2023

The Age And Primary Reason For The First Dental Visit In Children With Special Health Care Needs, Amanda Dickerson

Theses and Dissertations

Purpose: The aim of this project is to evaluate the average age and primary reason for the first dental visit among patients with special health care needs as well as to examine socioeconomic factors and other barriers related to children with special health care needs accessing care.

Methods: This is a cross-sectional survey that was distributed to caregivers of children with special health care needs. Study data was collected through REDCap, a secure web-based survey application. The inclusion criteria for participating in the survey included having a child with a special health care need that presented for a recall or …


Home Disruption And Substance Use: The Moderated-Mediating Role Of Family Conflict And Stress Among Racial-Ethnic Minoritized College Students, Geovani Muñoz Jan 2023

Home Disruption And Substance Use: The Moderated-Mediating Role Of Family Conflict And Stress Among Racial-Ethnic Minoritized College Students, Geovani Muñoz

Theses and Dissertations

The COVID-19 pandemic has disproportionately impacted first-generation college students who identify as racial-ethnic minorities (REM). Aside from the academic and health repercussions caused by COVID-19, little is known if home disruptions have increased substance use for REM college students. Specifically, increased home disruptions may directly relate to substance use and indirect relationships through increased family conflict and stress. Therefore, this master's thesis examined the direct relationships between home disruption and substance use. I also examined the relationships between home disruption and family conflict, as well as home disruption and stress. Further, I also investigated the relationships between family conflict and …


The Environment Of Interprofessional Education In Graduate Education: Exploring Professional Programs Of Occupational Therapy, Physician Assistant, And Physical Therapy, Allison R. Kaczmarek Jan 2023

The Environment Of Interprofessional Education In Graduate Education: Exploring Professional Programs Of Occupational Therapy, Physician Assistant, And Physical Therapy, Allison R. Kaczmarek

Theses and Dissertations

Interprofessional education (IPE) is an educational approach of increasing popularity in professional schools for the preparation of a collaborative ready healthcare workforce. The accrediting bodies of professional education programs in occupational therapy (OT), physician assistant (PA), and physical therapy (PT) have incorporated standards for outcomes addressing IPE. Although they have endorsed the Health Professions Accreditors Collaborative (HPAC) consensus document on quality IPE, we do not have a contemporary snapshot of the IPE environments in the curriculum of their accredited programs. This dissertation, a collection of three distinct inquiries, has two aims: first, to provide a description of IPE as it …


Family-Based Support As Social Determinants Of Health Protective Factor On Depression Of Parents Of Children With Autism Spectrum Disorder, Bisola E. Duyile Jan 2023

Family-Based Support As Social Determinants Of Health Protective Factor On Depression Of Parents Of Children With Autism Spectrum Disorder, Bisola E. Duyile

Theses and Dissertations

All parents experience challenges in their caregiving roles (Barańczuk & Pisula, 2020). However, parents raising a child/children with disabilities experience different social barriers (Oliver, 1996) that may also contribute to additional stressors in their caregiving role (Tomeny, 2016). Although these parents, on average, have reported greater symptoms of depression than parents of typically developing children, research shows that parents who reported receiving social support had lower symptoms of depression and stress (Das et al., 2017; Singh et al., 2017). Through the social determinants of health (SDOH) framework (ODPHP, 2022), the present study investigated informal/family-based support and its protective impact on …


Food Deserts And Pediatric Oral Health Status In An Under-Resourced Urban Community, Jessica T. Mcauliffe Jan 2023

Food Deserts And Pediatric Oral Health Status In An Under-Resourced Urban Community, Jessica T. Mcauliffe

Theses and Dissertations

Purpose: The aim of this analysis of survey data was to assess the influence of living within a food desert as a predictor of oral health problems among children of East Henrico County, Virginia.

Methods: Survey participants were recruited and questionnaires applied online. Residing in a food desert, using access to affordable produce as a proxy value, was the independent variable, while self- reported assessment of the child’s oral health status was the primary outcome variable. Analyses controlled for other indirect factors of pediatric oral health. Logistic regression was used to model the association between the self-reported access to healthy …


Salinization Impacts On Heterotrophic Respiration, Ecosystem Respiration, And Plant Productivity In Tidal Freshwater Marshes, Kelsie J. Moses Jan 2023

Salinization Impacts On Heterotrophic Respiration, Ecosystem Respiration, And Plant Productivity In Tidal Freshwater Marshes, Kelsie J. Moses

Theses and Dissertations

Tidal freshwater marshes have preserved substantial stocks of soil carbon, which represents carbon dioxide that is no longer in the atmosphere. There is conflicting evidence in the literature about how disturbances such as sea level rise and associated wetland salinization impact the accumulation and long-term stability of this stored carbon. The goal of this experiment was to quantify how salinization impacts total ecosystem respiration and its component parts, autotrophic and heterotrophic respiration. This was a microcosm experiment using a C4 plant (Spartina cynosuroides) grown in soil derived from C3 plant matter and exposed to different salinities (0 to …


Treponema Denticola Synthesizes C-Di-Amp And Encodes The Cdaa-Type Diadenylate Cyclase Cdaa, Claire R. O'Brien Jan 2023

Treponema Denticola Synthesizes C-Di-Amp And Encodes The Cdaa-Type Diadenylate Cyclase Cdaa, Claire R. O'Brien

Theses and Dissertations

Periodontitis is a form of oral disease characterized by dysbiosis of the oral microbiome, leading to inflammation, bone resorption, and in severe cases, entire tooth loss, affecting 42% of adults in the US. One of the bacteria most associated with periodontal disease progression is Treponema denticola (Td), an oral spirochete which inhabits the mouth in small quantities during health but which can dominate the biofilms that form during periodontal disease. The ability of Td to survive in a disease environment and contribute to the progression of disease requires the use of robust signaling networks. Analysis of Td cultures …


The Impact Of A Parent-Only Pediatric Obesity Intervention Program On Quality Of Life In Racially Diverse Children, Taylor Vashro Jan 2023

The Impact Of A Parent-Only Pediatric Obesity Intervention Program On Quality Of Life In Racially Diverse Children, Taylor Vashro

Theses and Dissertations

Pediatric obesity has been associated with significant decrements in pediatric quality of life (QOL) comparable with severe pediatric diseases such as cancer. Parenting interventions have yielded health benefits for children with obesity; however, few studies have investigated the impact of parent-focused interventions on QOL in children with overweight and obesity. This study investigated the impact of a 6-week intensive parenting intervention program on the QOL of 5-12 year old, predominantly Black children with overweight and obesity. Parents were randomized into either the parenting intervention (NOURISH+) or a control group, and QOL, as well as variables related to child and parenting …


The Impact Of Patient Characteristics On Dysphagia Therapy Utilization And Feeding Outcomes For Premature Infants In The Neonatal Intensive Care Unit, Tiana Nguyen Jan 2023

The Impact Of Patient Characteristics On Dysphagia Therapy Utilization And Feeding Outcomes For Premature Infants In The Neonatal Intensive Care Unit, Tiana Nguyen

Theses and Dissertations

Medical advances have significantly increased the survival rates of preterm infants at lower gestational ages. However, infants born at lower gestational ages have an increased risk for developmental disabilities and oral feeding difficulties. A stay in the neonatal intensive care unit (NICU) is very costly and inadequate oral feeding is the most common barrier to discharge for premature infants. Infants can receive dysphagia therapy services during their NICU stay that focuses on the development of oral feeding and swallowing skills. However, literature to this date has mainly focused on the impact of therapy services for premature infants after NICU discharge. …


Qvoices: Queer Voices In Oncology Igniting Change Through Empowered Stories Of Survivorship, Viktor Clark Jan 2023

Qvoices: Queer Voices In Oncology Igniting Change Through Empowered Stories Of Survivorship, Viktor Clark

Theses and Dissertations

Background: Each year in the United States there are roughly 2 million new cancer diagnoses, with over 600,000 deaths due to cancer. The National Cancer Institute developed a six-stage cancer control continuum framework ranging from etiology to survivorship to organize the cancer experience. Sexual and gender minorities (SGM) are comprised of multiple communities representing ~23.6 million adults in the US, SGM face disparities at each stage of the cancer control continuum. This study emphasizes three stages, prevention, detection, and treatment. Engagement in prevention can prevent or prolong cancer, early detection through engagement in cancer screening improves cancer trajectories and compliance …


Breaking Bread & Boundaries : Finding Home In Every Bite, Steffi Ann Braganza Jan 2023

Breaking Bread & Boundaries : Finding Home In Every Bite, Steffi Ann Braganza

Theses and Dissertations

Raised outside of their “passport” countries, Third Culture Individuals (TCIs) often experience a lack of rootedness and belonging, and home is often everywhere and nowhere. Childhood food memories can provide the sense of connection and identity TCIs crave. Four Qatar-raised TCIs, from very different backgrounds share memories of their childhood comfort foods, now hybridized dishes, that reflect their unique third culture experiences. Each dish, in turn, inspired the creation of a bespoke set of cooking /dining ware designed to trigger a specific sensory memory: the sight, smell, touch, or sound associated with the original comfort dish. This specialized cooking/dining ware …


How Do Cultural Norms Shape Healthy Eating In African Americans? The Role Of Cultural Congruence And Mindsets Of Health In Healthy Eating Intentions Among African American College Students, Danyel Smith Jan 2023

How Do Cultural Norms Shape Healthy Eating In African Americans? The Role Of Cultural Congruence And Mindsets Of Health In Healthy Eating Intentions Among African American College Students, Danyel Smith

Theses and Dissertations

Targeting dietary behaviors is a predominant strategy to reduce rates of obesity among African Americans, across the lifespan. Notably, dietary behaviors are shaped by social, cultural and environmental affordances. This study integrated Theory of planned behavior (TPB), identity-based motivation, and mindset theory to unearth cultural mechanisms that inform motivations to eat healthy among African American college students. This project employed a cross-sectional (Study 1) and experimental design (Study 2) to contextualize the antecedents of intentions to eat healthy among African American college students. Recruitment occurred via university-wide digital channels. Eligible participants: were 18+ years; Black/African American; were undergraduate students; and …


A Standardized Pipeline For Isolation And Assembly Of Genomes From Symbiotic Bacteria In Whole Louse Genomic Sequence Data., Mohammad Mikail I. Bala Jan 2023

A Standardized Pipeline For Isolation And Assembly Of Genomes From Symbiotic Bacteria In Whole Louse Genomic Sequence Data., Mohammad Mikail I. Bala

Theses and Dissertations

Many insects are known to harbour intracellular and heritable bacteria (endosymbionts), which provide their hosts with adaptive traits. Whole insect gDNA shotgun sequencing projects often sequence the genome of endosymbiont, in addition to the insect’s genome. There are approximately 600 whole genome shotgun libraries from insects available on the public repository (NCBI), which can be mined to obtain endosymbiont genomes. The assembly and annotation of endosymbiont genomes can contribute towards the exploration of their role as obligate symbiotic partners. However, de novo assembly of an endosymbiont genome, continues to be challenging, when the host and/or enteric bacterial gDNA is present …


The Impact Of A Series Of Professional Development Sessions On Culturally Responsive Pedagogy (Crp) On The Awareness Level Of Seven Teachers At A Suburban High School, Charity Jo Brady Jan 2023

The Impact Of A Series Of Professional Development Sessions On Culturally Responsive Pedagogy (Crp) On The Awareness Level Of Seven Teachers At A Suburban High School, Charity Jo Brady

Theses and Dissertations

This dissertation aimed to examine the impact that culturally responsive pedagogy had on a suburban high school. Specifically, it focused on the effectiveness of a six-session professional development series in increasing the awareness level of seven teacher-participants at Bayside High School during the Spring 2022 semester. The study utilized pre- and post- questionnaires, weekly journal reflections (written), field notes and observations, and participant interviews for data collection. The findings suggest that the professional development sessions were successful in increasing the awareness level of the teachers, leading to a more culturally responsive classroom environment. This study highlights the importance of ongoing …


Producer Interviews And Analysis As A Tool For Science Communication And Research Implementation In Agriculture, Lacy Marie Barnette Jan 2023

Producer Interviews And Analysis As A Tool For Science Communication And Research Implementation In Agriculture, Lacy Marie Barnette

Theses and Dissertations

Research implementation beyond the laboratory requires both sound science and high-quality science communication. Science communication is an emerging field that is increasing in importance as the public has access to more information than ever, however there are some underlying obstacles like the lack of communication-specific training that scientists receive and disconnected populations. Agricultural producers have a perceived history of being disconnected from science even though modern agriculture relies heavily on researched practices and has an entire network of extension agencies intended to communicate with producers. One reason for this perceived disconnect is the one-way communication that has dominated science communication …


Attention Deficit Hyperactivity Disorder: Lived Experiences Of Adults Diagnosed With Adhd, Carole Larson Yokell Jan 2023

Attention Deficit Hyperactivity Disorder: Lived Experiences Of Adults Diagnosed With Adhd, Carole Larson Yokell

Theses and Dissertations

The problem addressed in the research was that many individuals were not diagnosed with attention deficit hyperactivity disorder (ADHD) until they were adults. The purpose of the study was to examine the experiences and beliefs of participants regarding the management of ADHD and the impact that experiences may or may not have regarding the quality of life during adulthood. This study utilized a phenomenological qualitative approach to collect data from adults diagnosed with ADHD about their life experiences. Data were gathered with virtual conference interviews and phone calls using an interview protocol that the researcher developed. Qualitative methods were utilized …


Targeting Parental Behavior: Contingency Contracting To Increase Parental Competence And Adherence, Sara Clasky Richardson Jan 2023

Targeting Parental Behavior: Contingency Contracting To Increase Parental Competence And Adherence, Sara Clasky Richardson

Theses and Dissertations

The purpose of this study was to investigate the impact of using behavior contracts specifically targeting parental behavior and providing reinforcing consequences for the parent’s behavior on parental adherence in implementing behavior contracts to address their child’s behavior problems. Parents used identical procedures to implement behavior contracts with their children to address their child’s noncompliance and associated problem behavior. A secondary purpose of this study was to determine parent perceptions about the impact their use of behavior contracts had on the behavior of their children.

This study used a multiple baseline across participants design to measure the effectiveness of a …


A Mixed-Method Study On Social Media’S Role In The Health Decision-Making Practices Of Black Millennial Women In South Florida, Sashah Damier Jan 2023

A Mixed-Method Study On Social Media’S Role In The Health Decision-Making Practices Of Black Millennial Women In South Florida, Sashah Damier

Theses and Dissertations

The purpose of this research study was to examine health care decision-making practices of Black millennial women in South Florida, based on their social media use. The study contributed to understanding of how cultural components contribute to health care disparities for people of color because health care providers lacked information on how to reach Black millennial women with accurate and helpful information through social media.

The design for the study included a convergent parallel mixed-methods design using a web-based quantitative cross-sectional survey along with embedded qualitative telephone interviews and NVivo software. This mixed-methods methodology provided rich data and new understandings …


Evaluating Growth Rates Of The Eastern Oyster (Crassostrea Virginica) And Water Quality For Oyster Restoration Sites At City Island, Bronx, Ny, Cody L. Jernigan Dec 2022

Evaluating Growth Rates Of The Eastern Oyster (Crassostrea Virginica) And Water Quality For Oyster Restoration Sites At City Island, Bronx, Ny, Cody L. Jernigan

Theses and Dissertations

Oyster growth and water quality were monitored at four sites at City Island, Bronx, NY, to determine suitability for oyster reef restoration. Significant growth occurred at two sites and water quality was not indicated as a contributing factor. Oyster growth at all sites indicate appropriate conditions for oyster reef restoration.


The Effect Of Gut Microbiota On Overwintering Success In Mule Deer, Emma Wilcox Dec 2022

The Effect Of Gut Microbiota On Overwintering Success In Mule Deer, Emma Wilcox

Theses and Dissertations

Mule deer are an important rangeland grazer, large prey species, and game animal for the state of Utah, so herd size is monitored and managed actively. A significant cause of population decline is poor overwintering survival, including from the lack of available forage during winter months. Mule deer energy storage is correlated with greater overwintering success, so physical estimates of energy storage including body condition score (BCS), rump fat (RF), and loin thickness (LT), can be used to track and predict a herd's health. Current methods of collecting deer information are costly, time consuming, and cause physical stress to deer, …


Evaluating Equitable Access To Nutrition In Utah, Emma Stucki Dec 2022

Evaluating Equitable Access To Nutrition In Utah, Emma Stucki

Theses and Dissertations

One of the more recent topics in transportation policy making and project prioritization in DOT's across the United States is how to improve quality of life. This quality of life focus is an intersection of public health and transportation and has many different branches including traffic safety, pollution, active transportation, equity, and accessibility to resources. The topic among these that seems to receive the least attention is equitable access to resources. However, with the proven impact that equitable access to resources has on physical and emotional well-being, as well as economic opportunity it is important to ensure that all populations, …


Identity Work To Teach Mathematics For Social Justice, Navy B. Dixon Dec 2022

Identity Work To Teach Mathematics For Social Justice, Navy B. Dixon

Theses and Dissertations

In this thesis, mathematics educators are conceptualized as individuals with multiple, simultaneous figured worlds that inform their decisions while planning. The study explores how two mathematics educators negotiated and orchestrated their figured worlds to plan two mathematics lessons for social justice. The results highlight how numerous the figured worlds each participant surfaced through background interviews. Some of the figured worlds were elicited by the interview questions (i.e., Race, Family, Social Justice Teaching) but other figured worlds organically surfaced through the interviews (i.e., Sexuality, Community, Activism, Critical Information Consumption). A discursive analysis of a selection of these figured worlds revealed conceptualizations …


Development Of A Crosslinked Osteochondral Xenograft And A Collagen Stabilizing Intra-Articular Injection To Remediate Cartilage Focal Lesions To Prevent Osteoarthritis, Mark Lewis Mosher Dec 2022

Development Of A Crosslinked Osteochondral Xenograft And A Collagen Stabilizing Intra-Articular Injection To Remediate Cartilage Focal Lesions To Prevent Osteoarthritis, Mark Lewis Mosher

Theses and Dissertations

Osteoarthritis is one of the most common causes of disability in adults in America. It is a progressive and degenerative disease where the articular cartilage is broken down and lost from the surfaces of bones causing chronic pain and swelling in the joints, and currently has no cure. The most commonly osteoarthritis starts from a focal lesion on the cartilage surface, which will expand on the surface and downwards through the thickness of the tissue. The current gold standard for correcting cartilage focal lesions is the osteochondral autograft/allograft transplantation (OAT), which replaces the defect with a fresh osteochondral graft. The …


Vegetation And Nutritional Changes Over 20 Years Of White-Tailed Deer Exclusion, Gabrielle Nicole Ripa Dec 2022

Vegetation And Nutritional Changes Over 20 Years Of White-Tailed Deer Exclusion, Gabrielle Nicole Ripa

Theses and Dissertations

Knowledge of the impacts of white-tailed deer (Odocoileus virginianus; hereafter deer) as dominant herbivores throughout the Southeastern United States of America is lacking. To address this, three paired experimental units of exclosures and controls were constructed in 2000 on three Wildlife Management Areas across Mississippi within the ecoregions of the Upper Coastal Plain, Lower Coastal Plain, and the Mississippi Alluvial Valley. Vegetation was sampled in the summers of 2000, 2005, and 2021 including vegetation structure, canopy coverage, basal area, and species composition. Additionally, in 2005 and 2021, biomass was sampled to determine potential impacts on nutritional carrying capacity. Among the …


Molecular And Phenotypic Characterization Of Escherichia Coli Isolated From Broiler Chicken Flocks In Mississippi, Priyanka Devkota Dec 2022

Molecular And Phenotypic Characterization Of Escherichia Coli Isolated From Broiler Chicken Flocks In Mississippi, Priyanka Devkota

Theses and Dissertations

Avian pathogenic Escherichia coli (APEC) is the causative agent of colibacillosis. APEC causes significant economic losses to the poultry industry. In this study, 66 E. coli isolates were collected from broiler flocks across Mississippi and categorized as clinical and non-clinical isolates. Genotypic and phenotypic characterization of virulence factors and antimicrobial resistance profiles of these E. coli were examined. The data disclosed a higher prevalence of virulence genes in clinical isolates than in non-clinical isolates. High differences on the genotypic and phenotypic antimicrobial resistance among clinical and non-clinical isolates were observed. Whole genome sequences of avian E. coli elaborated a diverse …


Reassessing Nitrogen Management For Maize Production In Mississippi, Camden Dawson Oglesby Dec 2022

Reassessing Nitrogen Management For Maize Production In Mississippi, Camden Dawson Oglesby

Theses and Dissertations

12 N treatments in 2020 and 11 in 2021 were replicated four times over four locations in a randomized complete block design. The first research tested the efficacy of CYG for Mississippi corn (Zea mays L.) production. The optimum N rates were calculated by fitting four models. Differences between the CYG rate and AONR were compared. AONR varied from 134 to 301 kg N ha–1 at different management levels. When we compared the AONR to the CYG rate, the CYG rate over-recommended N in 12 of the 14 possible comparisons. The second study compared different VIs, methods, and sensors at …


Effect Of Spray Droplet Size On Pronamide Control Of Annual Bluegrass (Poa Annua L.) And The Role Of Absorption And Translocation In The Mechanism Of Pronamide Resistance, Martin Ignes Dec 2022

Effect Of Spray Droplet Size On Pronamide Control Of Annual Bluegrass (Poa Annua L.) And The Role Of Absorption And Translocation In The Mechanism Of Pronamide Resistance, Martin Ignes

Theses and Dissertations

Annual bluegrass (Poa annua L.) is a problematic weed in turfgrass that has evolved resistance to twelve different herbicide sites of action. The mitotic-inhibiting herbicide pronamide has both pre- and post-emergence activity on susceptible annual bluegrass populations. Still, post-emergence activity may be compromised in some resistant populations due to the lack of root uptake or an unknown foliar resistance mechanism. Spray droplet size may affect foliar and soil deposition of pronamide, thus potentially explaining variation in population control or differential foliar and root uptake. Pronamide, flazasulfuron, and pronamide + flazasulfuron deposition were quantified on annual bluegrass as affected by spray-droplet …


Mitigating The Shrink-Swell Capacities Of The Yazoo Clay Through Application Of Lime And Biochar, Austin Alan Brister Dec 2022

Mitigating The Shrink-Swell Capacities Of The Yazoo Clay Through Application Of Lime And Biochar, Austin Alan Brister

Theses and Dissertations

Shrinking and swelling in Yazoo Clay is a cause of concern for construction projects in Mississippi. This thesis investigated the effects of adding lime and Douglas Fir biochar on the shrinking and swelling capabilities of Yazoo Clay. Samples of Yazoo Clay were mixed with the additives in defined ratios and subjected to the free swell test and the COLE(rod) test. Biochar addition reduced the COLE(rod) of the samples a large amount, while increasing the swelling potential of the clay samples. The addition of lime slightly reduced both the shrinking and swelling potentials of the samples. The mineralogical variability of Yazoo …