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Articles 151 - 180 of 183
Full-Text Articles in Genetics
Periocular Mesenchyme Heterogeneity During Morphogenesis Of The Vertebrate Ocular Anterior Segment, Kristyn L. Van Der Meulen
Periocular Mesenchyme Heterogeneity During Morphogenesis Of The Vertebrate Ocular Anterior Segment, Kristyn L. Van Der Meulen
Theses and Dissertations--Biology
The vertebrate eye is a complex organ, responsible for the primary sense with which we interact with our environment: vision. Development of the eye is a tightly regulated process, controlled by a vast network of genes. This process begins with eye morphogenesis, when the eye structure is formed through a series of morphogenetic movements and culminates in the creation of the optic cup, lens, and presumptive optic stalk. Next, retinal differentiation creates the critical cell layers of the retina needed to process light waves that enter the eye, including rod and cone photoreceptors, interneurons, and support cells. Failure in either …
Leveraging Chemical And Computational Biology To Probe The Cellulose Synthase Complex, B. Kirtley Amos
Leveraging Chemical And Computational Biology To Probe The Cellulose Synthase Complex, B. Kirtley Amos
Theses and Dissertations--Plant and Soil Sciences
Cellular expansion in plants is a complex process driven by the constraint of internal cellular turgor pressure by an expansible cell wall. The main structural element of the cell wall is cellulose. Cellulose is vital to plant fitness and the protein complex that creates it is an excellent target for small molecule inhibition to create herbicides. In the following thesis many small molecules (SMs) from a diverse library were screened in search of new cellulose biosynthesis inhibitors (CBI). Loss of cellular expansion was the primary phenotype used to search for putative CBIs. As such, this was approached in a forward …
Transactivation And Mitochondrial Activity Are Affected By High Temperature In C. Elegans Sperm, Jacqueline Mcvay
Transactivation And Mitochondrial Activity Are Affected By High Temperature In C. Elegans Sperm, Jacqueline Mcvay
Scripps Senior Theses
Sexual reproduction has a conserved flaw in that it is temperature sensitive. Exposure to high temperature leads to male infertility, but little is known about the underlying mechanism. Understanding these mechanisms is important for agriculture and reproductive medicine. Using C. elegans, we investigated two potential aspects of male fertility that may be affected by high temperature conditions: activation of sperm by seminal fluid and sperm mitochondrial activity. There are two pathways for sperm activation in C. elegans: the SPE-8 pathway in hermaphrodites and the TRY-5 pathway in male seminal fluid. Hermaphrodite sperm with a mutation in spe-8 can …
Identification And Optimization Of Mirna Biomarkers For Body Mass Index (Bmi) Estimation In Forensic Samples, Jennifer J. Shealy
Identification And Optimization Of Mirna Biomarkers For Body Mass Index (Bmi) Estimation In Forensic Samples, Jennifer J. Shealy
Master of Science in Forensic Science Directed Research Projects
DNA profiles do not provide as much evidentiary value when either all known samples can be excluded or when there is no known suspect. DNA phenotyping is a technique used for investigative purposes to predict externally visible characteristics (EVCs) based on specific markers found in the genome. Most phenotyping panels are currently restricted to markers stable over a lifetime within an individual and are not able to predict environmental or metabolic impacts on EVCs. It is known that miRNA expression levels change due to environmental and metabolic factors, such as BMI, and research has proven associations between circulating plasma miRNAs …
Attitudes And Opinions About Direct-To-Consumer Genetic Testing In Undergraduate Science Students, Morgan N. Driver, Sally I-Chun Kuo, Olivia Nayeri, Chloe J. Walker, Chelsea Derlan Willians, Tricia Smith, Amy E. Adkins, Danielle M. Dick
Attitudes And Opinions About Direct-To-Consumer Genetic Testing In Undergraduate Science Students, Morgan N. Driver, Sally I-Chun Kuo, Olivia Nayeri, Chloe J. Walker, Chelsea Derlan Willians, Tricia Smith, Amy E. Adkins, Danielle M. Dick
Graduate Research Posters
Background: There has been exponential growth in the number of direct-to-consumer genetic testing kits sold in the past decade. Consumers utilize direct-to-consumer genetic tests for a number of reasons which include learning about one’s ancestry and potential ways to manage health. Emerging adults tend to be early adopters of new technologies; however, there has been little research regarding the opinions about direct-to-consumer genetic testing in emerging adults.
Methods: Data came from a study conducted in an upper-level biology course focusing on understanding undergraduate science students’ overall experiences with receiving personalized genetic testing results from 23andMe. The present study used data …
Joint Modeling Of Rnaseq And Radiomics Data For Glioma Molecular Characterization And Prediction, Zeina A. Shboul, Norou Diawara, Arastoo Vossough, James Y. Chen, Khan M. Iftekharuddin
Joint Modeling Of Rnaseq And Radiomics Data For Glioma Molecular Characterization And Prediction, Zeina A. Shboul, Norou Diawara, Arastoo Vossough, James Y. Chen, Khan M. Iftekharuddin
Electrical & Computer Engineering Faculty Publications
RNA sequencing (RNAseq) is a recent technology that profiles gene expression by measuring the relative frequency of the RNAseq reads. RNAseq read counts data is increasingly used in oncologic care and while radiology features (radiomics) have also been gaining utility in radiology practice such as disease diagnosis, monitoring, and treatment planning. However, contemporary literature lacks appropriate RNA-radiomics (henceforth, radiogenomics) joint modeling where RNAseq distribution is adaptive and also preserves the nature of RNAseq read counts data for glioma grading and prediction. The Negative Binomial (NB) distribution may be useful to model RNAseq read counts data that addresses potential shortcomings. …
Exploring The Genetic Variability Of Zebra Mussels Dreisenna Polymoprha, Maxwell Carr
Exploring The Genetic Variability Of Zebra Mussels Dreisenna Polymoprha, Maxwell Carr
Journal of Earth and Life Science
Zebra Mussels Dreisenna polymorpha are one of the most well-known invasive species here in the United States. This species can take over watersheds very quickly, causing damage to both the ecosystem and man-made structures. The basic physical behavior of this species has been well documented, but the invasive North American Zebra Mussel is much more aggressive and therefore causes more damage in the Great Lakes region compared to its native waters. Genetic variation may be playing a very large role in how and why D. polymorpha is causing such large problems for stakeholders in the United States. This review cites …
Mnrr1: Understanding The Role Of A Novel Mitochondrial-Nuclear Regulator, Stephanie L. Gladyck
Mnrr1: Understanding The Role Of A Novel Mitochondrial-Nuclear Regulator, Stephanie L. Gladyck
Wayne State University Dissertations
Mitochondria are complex organelles that generate most of the energy required to sustain life and function in metabolic and signaling pathways required to maintain cellular homeostasis. MNRR1 (mitochondrial nuclear retrograde regulator 1 or CHCHD2) is a small, bi-organellar twin CX9C protein that is emerging as an important regulator of mitochondrial function, apoptosis, and cellular stress by participating in mitochondrial-nuclear crosstalk. Our lab has previously shown that in the mitochondria, MNRR1 regulates complex IV (Cytochrome c oxidase or COX) and is able to finetune the oxidase function through phosphorylation status. We have also shown that during stress, mitochondrial MNRR1 levels deplete, …
Modulation Of Pharyngeal Health In Bacterial Diet-Dependent Survival, Deniz Sifoglu
Modulation Of Pharyngeal Health In Bacterial Diet-Dependent Survival, Deniz Sifoglu
Wayne State University Dissertations
ABSTRACT
MODULATION OF PHARYNGEAL HEALTH IN BACTERIAL DIET-DEPENDENT SURVIVAL
by
DENIZ SIFOGLU
August 2021
Advisor: Dr. Joy Alcedo Major: Biological Sciences Degree: Doctor of Philosophy Both diet and bacterial microbiome modulate insulin signaling, which regulates key physiological processes that are important for survival. However, the mechanisms through which diet and the microbiome modulate insulin signaling remain unclear. To understand these mechanisms, I turned to the nematode worm C. elegans, whose diet consists of different types of bacteria. Like humans and other animals, C. elegans has to modulate its responses to its diet and to bacteria to optimize its survival. Because …
Biomarkers Of Ptsd: Dried Blood Spot Mrna Isolation, Amplification, And Analysis, Tyler F. Chan, Sarah G. Van Winkle
Biomarkers Of Ptsd: Dried Blood Spot Mrna Isolation, Amplification, And Analysis, Tyler F. Chan, Sarah G. Van Winkle
Summer Community of Scholars Posters (RCEU and HCR Combined Programs)
No abstract provided.
Enviromental Dna Analysis Of A Critically Endangered Cavefish, Katelyn Gitner
Enviromental Dna Analysis Of A Critically Endangered Cavefish, Katelyn Gitner
Summer Community of Scholars Posters (RCEU and HCR Combined Programs)
No abstract provided.
The Origin Of Novel Trait Inferred From Transcriptomic Analysis And A Targeted Gene Approach In The Beetle Horns., Naureen Fatima
The Origin Of Novel Trait Inferred From Transcriptomic Analysis And A Targeted Gene Approach In The Beetle Horns., Naureen Fatima
Graduate Theses, Dissertations, and Problem Reports (ETD)
The origin of the evolutionary new trait (evolutionary novelty) and its subsequent evolution is of great interest for biologists in various fields, and beetle horns have been used to address this fundamental biological question. Previous studies on one of the horned beetle species, Onthophagus taurus, that utilized comparative gene expression analyses, suggested legs to be a strong candidate of the origin of horns. At the same time, their horns are secondary sexual traits whose development is regulated by the same gene (doublesex) as genitalia, which also originates from paired appendages such as legs. However, little is known …
Effects Of 4-Methylcyclohexanemethanol On Stress Response Pathway Regulators, In Saccharomyces Cerevisiae, Suk Lan Ser
Effects Of 4-Methylcyclohexanemethanol On Stress Response Pathway Regulators, In Saccharomyces Cerevisiae, Suk Lan Ser
Graduate Theses, Dissertations, and Problem Reports (ETD)
Hydrotropes are small molecules capable of inducing liquid-liquid phase separation by altering the solubility and conformation states of organic compounds that are increasingly becoming important in organizing chemical reactions and regulating complexes. They prevent protein aggregation causing these proteins to form condensates. Mediator, a highly conserved multi-subunit complex, plays an important role in transcription. Med15, a subunit found within the tail domain of the Mediator complex, works with stress-induced transcription factors and is regulated by many kinases, including CDKs and the AMP kinase, Snf1. Living cells respond by changing molecular and cellular pathways when they are exposed to stressful conditions. …
Molecular Mechanisms Regulating Optic Fissure Fusion During Zebrafish Eye Development, Megan Weaver
Molecular Mechanisms Regulating Optic Fissure Fusion During Zebrafish Eye Development, Megan Weaver
Theses and Dissertations--Biology
Vertebrate retinal development requires timely and precise fusion of the optic fissure. Failure of this event leads to congenital vision impairment in the form of coloboma. Recent studies have suggested hyaloid vasculature to be involved in OF fusion. In order to examine this link, we analyzed optic fissure fusion and hyaloid vasculogenesis in the zebrafish pax2a noi mutant line. We first determined that pax2a-/- embryos fail to accumulate F-actin in the optic fissure prior to basement membrane (BM) degradation. Furthermore, using 3D and live imaging we observed reduced OF hyaloid vascularization in pax2a-/- embryos. When examining the connection …
Microbiomes Of Blood-Feeding Arthropods: Genes Coding For Essential Nutrients And Relation To Vector Fitness And Pathogenic Infections. A Review, Daniel E. Sonenshine, Philip E. Stewart
Microbiomes Of Blood-Feeding Arthropods: Genes Coding For Essential Nutrients And Relation To Vector Fitness And Pathogenic Infections. A Review, Daniel E. Sonenshine, Philip E. Stewart
Biological Sciences Faculty Publications
Blood-feeding arthropods support a diverse array of symbiotic microbes, some of which facilitate host growth and development whereas others are detrimental to vector-borne pathogens. We found a common core constituency among the microbiota of 16 different arthropod blood-sucking disease vectors, including Bacillaceae, Rickettsiaceae, Anaplasmataceae, Sphingomonadaceae, Enterobacteriaceae, Pseudomonadaceae, Moraxellaceae and Staphylococcaceae. By comparing 21 genomes of common bacterial symbionts in blood-feeding vectors versus non-blooding insects, we found that certain enteric bacteria benefit their hosts by upregulating numerous genes coding for essential nutrients. Bacteria of blood-sucking vectors expressed significantly more genes (p < 0.001) coding for these essential nutrients than those of non-blooding insects. Moreover, compared to endosymbionts, the genomes of enteric bacteria also contained significantly more genes (p < 0.001) that code for the synthesis of essential amino acids and proteins that detoxify reactive oxygen species. In contrast, microbes in non-blood-feeding insects expressed few gene families coding for these nutrient categories. We also discuss specific midgut bacteria essential for the normal development of pathogens (e.g., Leishmania) versus …
Identifying Genes Downstream Of Mef2 That Influence Ethanol Sedation In Drosophila Melanogaster, Ananya Talikoti
Identifying Genes Downstream Of Mef2 That Influence Ethanol Sedation In Drosophila Melanogaster, Ananya Talikoti
Theses and Dissertations
Alcohol use disorder is a global public health issue that affects millions across the world. It can result in negative physical and mental health outcomes, and currently treatment options are limited and rates of relapse are high. Identifying genes that affect aspects of ethanol behaviors in model organisms, such as Drosophila melanogaster, can serve to eventually develop more robust therapeutic interventions for those experiencing alcohol dependence. Previous studies have identified a relationship between a person's initial sensitivity to alcohol and their abuse potential for the drug in later life. Therefore, we can study sedation behaviors in Drosophila melanogaster to …
การเพิ่มประสิทธิภาพในการยับยั้งเชื้อแบคทีเรียก่อโรคของแบคทีริโอซินจาก Bacillus Licheniformis ที่แยกได้จากระบบทางเดินอาหารของกุ้ง, แพรทิพย์ คล้ายเจริญสุข
การเพิ่มประสิทธิภาพในการยับยั้งเชื้อแบคทีเรียก่อโรคของแบคทีริโอซินจาก Bacillus Licheniformis ที่แยกได้จากระบบทางเดินอาหารของกุ้ง, แพรทิพย์ คล้ายเจริญสุข
Chulalongkorn University Theses and Dissertations (Chula ETD)
การเพาะเลี้ยงสัตว์น้ำเพื่อเป็นแหล่งอาหาร มีผลต่อความมั่นคงทางอาหารและโภชนาการของมนุษย์ โดยกุ้งทะเลจัดเป็นสัตว์น้ำเศรษฐกิจอันดับหนึ่งของไทย ตั้งแต่ปี พ.ศ. 2534 เป็นต้นมา เนื่องจากเป็นสัตว์น้ำที่ได้รับความนิยมบริโภคทั้งในประเทศและต่างประเทศทั่วโลก แต่ในปี พ.ศ. 2555-2556 การเลี้ยงกุ้งเริ่มประสบปัญหาโรคระบาดอย่างหนักจากอาการตายด่วนเนื่องจากตับและตับอ่อนวายเฉียบพลัน (Early mortality syndrome/ acute hepatopancreatic necrosis disease : EMS/AHPND) ทําให้เกิดความเสียหายต่อเกษตรกรและส่งผลกระทบต่อภาคอุตสาหกรรม รวมไปถึงสูญเสียส่วนแบ่งการตลาดและมูลค่าการส่งออกกุ้งทะเลเป็นอย่างมาก ต่อมาได้มีการพัฒนาจุลินทรีย์ ปม.1 ที่เป็นโพรไบโอติกในกลุ่มบาซิลัส เพื่อลดอัตราการเกิดโรค ซึ่งเชื้อ B. licheniformis ที่รวมในกลุ่มโพรไบโอติกนี้ มีความสามารถสร้างแบคทีริโอซินที่ยับยั้งการเจริญของเชื้อก่อโรคได้ มีคุณสมบัติทนความร้อน 100 °C ทำงานได้ดีในค่าความเป็นกรด-ด่างกว้าง จึงเป็นที่น่าสนใจในการศึกษาสภาวะที่เหมาะสมเพื่อเพิ่มปริมาณการสร้างแบคทีริโอซินของเชื้อ B. licheniformis และประสิทธิภาพในการยับยั้งเชื้อก่อโรค จากการทดสอบเพาะเลี้ยงเชื้อ B. licheniformis ในอาหารเหลว Tryptic Soy Broth มีความเข้มข้นของเชื้อเป็น 106 CFU/มิลลิลิตร ในสภาวะที่ปรับเปลี่ยนอุณหภูมิ ช่วงเวลา และความเข้มข้นของเกลือที่ต่างกัน ผลการทดสอบประสิทธิภาพการยับยั้งเชื้อก่อโรคในกุ้งด้วยวิธี Total plate count พบว่า ในน้ำเลี้ยงเชื้อ (Cell Free Supernatant: CFS) สามารถยับยั้งเชื้อทดสอบได้แก่ เชื้อ Vibrio alginolyticus และ Vibrio parahaemolyticus ซึ่งเป็นสายพันธุ์ที่เป็นสาเหตุของโรคตับและตับอ่อนวายเฉียบพลันในกุ้งได้ดี เมื่อเพาะเลี้ยงเชื้อ B. licheniformis ที่อุณหภูมิ 30 องศาเซลเซียสเป็นเวลา 72 ชั่วโมง และเลี้ยงในอาหารเหลว TSB ที่มีเกลือความเข้มข้น 2.5% และเมื่อเลี้ยง B. licheniformis ร่วมกับเซลล์ของเชื้อทดสอบที่ถูกทำให้ตายด้วยความร้อน พบว่าน้ำเลี้ยงเชื้อยังคงมีประสิทธิภาพในการยับยั้งเชื้อทดสอบ จากนั้นตรวจวิเคราะห์ประสิทธิภาพการทำลายเซลล์ของแบคทีเรียก่อโรคของน้ำเลี้ยงเชื้อด้วยกล้องจุลทรรศน์อิเลคตรอนพบว่าส่วนที่ห่อหุ้มเซลล์ของเชื้อทดสอบมีลักษณะเป็นรู นอกจากนี้พบว่าสารยับยั้งในน้ำเลี้ยงเชื้อที่เกิดจากการเพาะเลี้ยงและจาก B. licheniformis ร่วมกับเซลล์ V. alginolyticus ที่ถูกทำให้ตายด้วยความร้อน มีความสามารถทำให้เซลล์ของเชื้อทดสอบมีขนาดเล็กลง และลดการเกาะกลุ่มของเชื้อทดสอบได้ดี ผลจากการวิเคราะห์ลำดับกรดอะมิโนในน้ำเลี้ยงเชื้อ (Cell-Free …
การพัฒนาเทคนิค Multiplex Allele-Specific Recombinase Polymerase Amplification With Dipstick Chromatography (Mas-Rpa-Dc) ในการวินิจฉัยการดื้อยา Rifampicin ของเชื้อ Mycobacterium Tuberculosis, มัชฐาวี โพธิกนิษฐ
Chulalongkorn University Theses and Dissertations (Chula ETD)
วัณโรคดื้อยาหลายขนาน (Multidrug-resistant tuberculosis: MDR-TB) เป็นหนึ่งในสาเหตุหลักที่ทำให้การรักษาวัณโรคล้มเหลว และส่งผลให้การแพร่ระบาดของโรคยังคงมีอัตราที่สูง วัณโรคดื้อยาหลายขนานเกิดจากเชื้อ Mycobacterium tuberculosis ที่ดื้อต่อยา Rifampicin และยา Isoniazid พร้อมกัน โดยมากกว่า 90% ของวัณโรคที่ดื้อยา Rifampicin มักเกิดการดื้อยา Isoniazid ร่วมด้วยภายหลัง ดังนั้นการตรวจวินิจฉัยการดื้อยา Rifampicin ของเชื้อ M. tuberculosis จึงสามารถใช้เป็นตัวแทนในการตรวจหาวัณโรคดื้อยาหลายขนานได้ วิธีทางอณูชีววิทยาที่ใช้วินิจฉัยวัณโรคดื้อยาหลายขนานในปัจจุบันต้องอาศัยเครื่องมือที่มีราคาแพงและการดูแลซ่อมบำรุงอย่างสม่ำเสมอ การเพิ่มปริมาณสารพันธุกรรมภายใต้อุณหภูมิคงที่ได้เข้ามามีบทบาทอย่างมากในการวินิจฉัยโรคทางห้องปฏิบัติการและเป็นทางเลือกสำหรับการทดสอบที่ไม่ต้องอาศัยเครื่องมือที่จำเพาะ สามารถให้ผลการทดสอบที่ถูกต้อง รวดเร็ว และนำไปประยุกต์ใช้ ณ งานภาคสนามได้ การศึกษาครั้งนี้มีวัตถุประสงค์เพื่อพัฒนาเทคนิค Multiplex allele-specific recombinase polymerase amplification ร่วมกับ dipstick chromatography (MAS-RPA-DC) สำหรับตรวจหาการกลายพันธุ์ภายในยีน rpoB ณ ตำแหน่งโคดอน 516 526 และ 531 ซึ่งสัมพันธ์กับการดื้อยา Rifampicin ของเชื้อ M. tuberculosis ในการทดสอบภายใต้ปฏิกิริยาเดียวกันและแบบอ่านผลด้วยตาเปล่า ภายหลังนำเทคนิค MAS-RPA-DC มาทดสอบกับ DNA ที่สกัดได้จากโคโลนีของเชื้อ M. tuberculosis สายพันธุ์คลินิกจำนวน 141 ตัวอย่าง พบว่าเทคนิค MAS-RPA-DC มีความไวและความจำเพาะที่สูงเมื่อเปรียบเทียบกับเทคนิค Sanger DNA sequencing โดยมีความไวในการตรวจการกลายพันธุ์ของยีน rpoB516 rpoB526 และ rpoB531 มีค่าเท่ากับ 100 % 70 % และ 98.2 % ตามลำดับ มีค่าความจำเพาะในการตรวจการกลายพันธุ์ของยีน rpoB516 rpoB526 และ rpoB531 เท่ากับ 95.5 % 97.5 % และ 97.7 …
Using Genetic Approaches To Understand Tumorigenesis In Drosophila, Shawna Defreitas
Using Genetic Approaches To Understand Tumorigenesis In Drosophila, Shawna Defreitas
College of Graduate Studies: Theses & Dissertations
The large number of conserved molecular and signaling pathways between Drosophila melanogaster and humans, makes Drosophila an effective model organism to better understand human diseases, including cancers. Previous studies by clinicians and researchers have identified PTEN, BRCA2, P53, NF1, and RB1 as key mutational drivers in High Grade Serous Ovarian Cancer (HGSOC), the most malignant form of ovarian cancer in humans. The objective of this study was to develop a tumor model in the follicle cell epithelium of the Drosophila ovary and to use immunohistochemistry to study the molecular mechanisms behind tumor development. First, the Drosophila …
Mimicking The Effect Of Prolactin On Stat3/Stat5 Activity In Breast Cancer, Jennifer N. Barbuto, Sarah R. Walker
Mimicking The Effect Of Prolactin On Stat3/Stat5 Activity In Breast Cancer, Jennifer N. Barbuto, Sarah R. Walker
Honors Theses and Capstones
Signal transducers and activators of transcription (STAT) 3 and 5 are commonly constitutively activated in breast cancer. STAT5 can outcompete STAT3 and reduce cell proliferation and metastasis. STAT5 activation is stimulated by prolactin, a natural hormone that can be harmful at high levels. The aim of this study is to identify some possible previously developed drugs that mimic the effect of prolactin and STAT5 without the added risk in MDA-MB231 breast cancer cells. Using the CLUE database query app and STAT5 up- and downregulation signatures, three drugs (X, K, and M) were chosen based on their similarity in signatures to …
Sars-Cov-2: An Investigation On Mutagenicity And Its Effects On Infectivity And Mortality, Tyler Elliott Silverwood
Sars-Cov-2: An Investigation On Mutagenicity And Its Effects On Infectivity And Mortality, Tyler Elliott Silverwood
Honors Theses and Capstones
SARS-CoV-2, the etiological agent of the COVID-19 pandemic, has rapidly become a worldwide public health concern. Classified as a betacoronavirus, it is the third human coronavirus (HCoV) to emerge in the 21st century that causes severe disease, alongside SARS-CoV and MERS-CoV. The genome consists of open reading frames encoding accessory proteins and four structural proteins, including the spike protein which is a key determinant of host cell tropism. Mutations within the genome, particularly the spike gene, have been linked in-vitro to increased binding affinity to the human receptor angiotensin-converting enzyme 2 (hACE2), increased fitness in human hosts, and immune evasion. …
Creating A Georgia Southern Spider Collection: Can Dna Barcoding Help?, Guy B. Hobbs
Creating A Georgia Southern Spider Collection: Can Dna Barcoding Help?, Guy B. Hobbs
College of Graduate Studies: Theses & Dissertations
With over 280 spider (Araneae) species recorded within the State of Georgia, USA, the need for a well-documented natural history collection with a usable voucher system is critical to continually assess spider diversity and their future ecological impact in this region. Spider identification can be daunting for the inexperienced taxonomist; it is time consuming and sometimes requires destructive procedures. Previous works have successfully used an alternative method, DNA barcoding, to correctly identify spider species while preserving their morphology. This study set forth to create the core of a well-documented spider collection within Georgia Southern University’s Institute for Coastal Plain Science …
Disease Prevalence And The Population Genetic Structure Of Crassostrea Virginica Along The Georgia Coast, Sarah Batchelor
Disease Prevalence And The Population Genetic Structure Of Crassostrea Virginica Along The Georgia Coast, Sarah Batchelor
College of Graduate Studies: Theses & Dissertations
The Eastern Oyster, Crassostrea virginica, is an ecologically important species that plays a role in protecting shorelines, water filtration, and providing habitat and food for various fish species. Perkinsus marinus and Haplosporidium nesloni are two pathogens currently affecting oyster populations. These pathogens have both been documented as causes of mass mortality events along the East coast. They greatly diminish the health of oysters, resulting in the degradation of oyster tissue, reduction in growth and reproductive ability, and may cause death. In this study, wild oysters were collected from eleven locations along the Georgia coast to investigate the presence, intensity, …
Population Genetics Of A Reintroduced Fisher (Pekania Pennanti) Population In West Virginia, Caroline E. Harms
Population Genetics Of A Reintroduced Fisher (Pekania Pennanti) Population In West Virginia, Caroline E. Harms
Graduate Theses, Dissertations, and Problem Reports (ETD)
Fishers (Pekania pennanti) were reintroduced in West Virginia in 1969 with no population wide genetic analysis ever having been conducted. Genetic analysis of reintroduced populations is vital to assess genetic diversity as an indicative of population viability. My objective was to collect fisher samples throughout West Virginia, nearby states where fisher may be migrating (PA and NY), and the New Hampshire source population to provide a full genetic interpretation of the reintroduced West Virginia population. Genetic analysis was used to measure genetic diversity, admixture or delineation of subpopulations, and effective population size. Sample location and genetic data were …
In Silico Investigation Of Cardiac Arrhythmia Susceptibility In Long Qt Phenotype, Anthony Owusu-Mensah, Victoria Lam, Bright Tsevi, Michel Audette, Makarand Deo
In Silico Investigation Of Cardiac Arrhythmia Susceptibility In Long Qt Phenotype, Anthony Owusu-Mensah, Victoria Lam, Bright Tsevi, Michel Audette, Makarand Deo
Electrical & Computer Engineering Faculty Publications
Long QT Syndrome (LQTS) is associated with cardiac arrhythmia and sudden cardiac death. The Long QT Type 2 (LQT2) phenotype, which accounts for 35–40 % of all LQTS patients, is caused by mutations in HERG gene. The mechanisms of arrhythmia in presence of LQT2 conditions are not fully understood. We utilized anatomically and electrophysiologically realistic numerical simulations to elucidate the mechanisms of arrhythmia initiation in presence of blockade in rapid component of delayed rectifier potassium current, IKr. We utilized a 3D finite element model of rabbit ventricles integrated with His-purkinje network to simulate whole heart response to LQT2 …
Weak Olfactory Preferences Of The Gall Midge Asphondylia Borrichiae, Associated Fungal Endophytes And Implications On Gene Flow And Host Range Expansion, Frances S. Nagle
Weak Olfactory Preferences Of The Gall Midge Asphondylia Borrichiae, Associated Fungal Endophytes And Implications On Gene Flow And Host Range Expansion, Frances S. Nagle
UNF Graduate Theses and Dissertations
Asphondylia borrichaie is a small fly (Diptera: Cecidomyiidae) that is currently undergoing host-associated sympatric divergence. Asphondylia borrichaie is an ambrosia galler, these insects utilize a host plant for oviposition, but its offspring also rely on a symbiotic fungus (or fungal community) to promote the formation of the gall as well as serve as a food source for the developing larvae. Previous studies indicate that A. borrichaie consists of two host- associated populations based on its original host plant Borrichia frutescens (Asterales: Asteraceae), and another one from the two Iva species (I. frutescens (Asterales: Asteraceae) and I. imbricata …
Statistical Methods In Genetic Studies, Cheng Gao
Statistical Methods In Genetic Studies, Cheng Gao
Dissertations, Master's Theses and Master's Reports
This dissertation includes three Chapters. A brief description of each chapter is organized as follows.
In Chapter 1, we proposed a new method, called MF-TOWmuT, for genome-wide association studies with multiple genetic variants and multiple phenotypes using family samples. MF-TOWmuT uses kinship matrix to account for sample relatedness. It is worth mentioning that in simulations, we considered hidden polygenic effects and varied the proportion of variance contributed by it to generate phenotypes. Simulation studies show that MF-TOWmuT can preserve the type I error rates and is more powerful than several existing methods in different simulation scenarios, MFTOWmuT is also quite …
The Effect Of Nutrition On Longevity And Fertility In Diverse Drosophila: A Tor-Mediated Process, Tessa E. Steenwinkel
The Effect Of Nutrition On Longevity And Fertility In Diverse Drosophila: A Tor-Mediated Process, Tessa E. Steenwinkel
Dissertations, Master's Theses and Master's Reports
Nutrition and growth are strongly linked, but not much is known about how nutrition leads to growth. To understand the connection between nutrition through diet, growth and/or proliferation, we need to study the phenotypes resulting from the activation and inhibition of central metabolic pathways. Here I use the model organism Drosophila melanogaster (D. mel.) and three non-model Drosophila species with different dietary needs, Drosophila guttifera (D. gut.), Drosophila deflecta (D. def.), and Drosophila tripunctata (D. tri.), to study the effects of dietary amino acid availability in these diverse flies on fecundity and …
Construction And Analysis Of Genetic Regulatory Networks With Rna-Seq Data From Arabidopsis Thaliana, Tessa Kriz
Construction And Analysis Of Genetic Regulatory Networks With Rna-Seq Data From Arabidopsis Thaliana, Tessa Kriz
Dissertations, Master's Theses and Master's Reports
Reconstruction of gene regulatory networks (GRNs) is a fundamental aspect of genetic engineering and provides a deeper understanding of the biological processes of an organism. Two methods were implemented to reconstruct the gene regulatory networks of Arabidopsis thaliana under two treatments: methyl jasmonate (MeJa) and salicylic acid (SA). The Joint Reconstruction of multiple Gene Regulatory Networks (JRmGRN) method was utilized to construct a joint network for identifying hub genes common to both conditions in addition to networks specific to each condition. The Differential Network Analysis with False Discover Rate Control method constructed a network of connections unique to only one …
การศึกษาการแสดงออกของ Efflux Pump ในเชื้อ Acinetobacter Baumannii ที่ถูกเหนี่ยวนำให้ดื้อยา Amikacin, ณัฐนิชา บัวงามดี
การศึกษาการแสดงออกของ Efflux Pump ในเชื้อ Acinetobacter Baumannii ที่ถูกเหนี่ยวนำให้ดื้อยา Amikacin, ณัฐนิชา บัวงามดี
Chulalongkorn University Theses and Dissertations (Chula ETD)
เชื้อแบคทีเรียแกรมลบ Acinetobacter baumannii เป็นเชื้อฉวยโอกาส ที่ก่อให้เกิดการติดเชื้อในโรงพยาบาล และมีการดื้อต่อยาปฏิชีวนะหลายชนิด จากหลายกลไกการดื้อยา รวมถึงการใช้ efflux pump ขับยาออกนอกเซลล์ การศึกษาครั้งนี้ผู้วิจัยได้ทดสอบหาค่าความเข้มข้นต่ำสุดที่ยับยั้งการเจริญเติบโตของเชื้อ (MIC) ต่อยา amikacin ในเชื้อ A. baumannii ทั้งหมด 8 ตัวอย่าง ที่ได้จากสิ่งส่งตรวจของผู้ป่วย และเชื้อสายพันธุ์มาตรฐาน ATCC 19606 พบว่าเชื้อ A. baumannii 7 ตัวอย่างมีค่า MIC อยู่ในช่วง 0.25 – 4 µg/mL (ไวต่อยา) และเชื้ออีก 2 ตัวอย่างมีค่า MIC เท่ากับ 64 และมากกว่า 256 µg/mL (ดื้อต่อยา) เมื่อเหนี่ยวนำเชื้อด้วยยา amikacin โดยเพาะเลี้ยงเชื้อในสภาวะที่มียา amikacin ความเข้มข้นเพิ่มขึ้นเป็นสองเท่า ทุก 48 ชั่วโมง ติดต่อกันเป็นเวลาหลายวัน พบว่าเชื้อ A. baumannii หลังเหนี่ยวนำด้วยยา amikacin ทั้ง 8 ตัวอย่าง มีค่า MIC เพิ่มขึ้นอยู่ในช่วง 32 ถึงมากกว่า 256 µg/mL ผลการศึกษาการใช้สารยับยั้ง efflux pump ได้แก่ สาร carbonylcyanide m-chlorophenylhydrazone (CCCP) พบว่าเชื้อ A. baumannii หลังเหนี่ยวนำด้วยยา amikacin ทั้ง 8 ตัวอย่าง มีค่า MIC ต่อยา amikacin เมื่อมีสาร CCCP ลดลงมากกว่าหรือเท่ากับ 4 เท่าของค่า MIC ต่อยา amikacin ที่ไม่มีสาร …