Browsing by Subject "reproducibility"
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Item Evaluation of a Novel Dual Biometric Device Used to Obtain DNA from Fingerprints(2008-06-01) Mann, Michael L.; Arthur Eisenberg; John Planz; Joseph WarrenSummary: MICROFIELD COMPANY S.A. is currently developing a non intrusive method of obtaining a reference DNA sample known as Lift & Rub (Figure 1). The Lift & Rub is a self-adhesive security stamp designed to collect a single fingerprint from a known individual that can be used for DNA analyses. Lift & Rub is composed of an adhesive material with a protective film. The Lift & Rub is composed of an adhesive material with a protective film. The Lift & Rub is used in conjunction with an abrasive strip and a product named Dry-Ink, a graphite laminate. Together these items allow for an alternative to the traditional fingerprint collection technique and improve on it by allowing for DNA analysis. The objective of this research is test and maximize the performance of Lift & Rub. Microfield’s Lift & Rub is designed to collect a single fingerprint from a known individual to be used for DNA analyses. The Lift & Rub is intended to provide a full genetic profile of a known individual. This project aims to: 1) establish a standard collection protocol by evaluating empirical data to determine the average DNA yields using various collection techniques; 2) evaluate the reproducibility of DNA profiles obtained; and 3) gauge the overall success rate of obtaining a complete profile.Item Internal Validation of Applied Biosystems Quantifiler Duo DNA Quantitation Kit For Use in Fornesic Casework(2008-08-01) Klein, Cindi Leann; Arthur Eisenberg; Joseph Warren; John PlanzKlein, Cindi Leann. Internal Validation of Applied Biosystems Quantifiler Duo DNA Quantification Kit for Use in Forensic Casework. Master of Science (Forensic Genetics), August 2008, 48 pages, 19 figures, 4 tables, 10 references. Applied Biosystems (Foster City, CA) has recently developed a new DNA quantification kit, Quantifiler Duo, which simultaneously quantitates the total amount of amplifiable human and male DNA present in a sample. The kit is a multiplex real-time PCR system based on the 5’ nuclease assay and Taqman probe-based technology. An internal validation was performed at the Harris County Medical Examiner’s Office using Quantifiler Duo and was comprised of six studies: sensitivity, reproducibility, cross-contamination, precision, mixture, and stability. The preliminary results show an increased sensitivity from the currently used Quantifiler Human and Quantifiler Y Human Male DNA Quantification kits. The accuracy and precision of the Quantifiler Duo kit was also comparable or superior to that of the current kits.Item Rat Strain and Housing Conditions Alter Oxidative Stress and Hormone Responses to Chronic Intermittent Hypoxia(Frontiers Media S.A., 2018-11-06) Snyder, Brina D.; Duong, Phong; Tenkorang, Mavis A. A.; Wilson, E. Nicole; Cunningham, Rebecca L.Sleep apnea has been associated with elevated risk for metabolic, cognitive, and cardiovascular disorders. Further, the role of hypothalamic-pituitary-adrenal (HPA) activation in sleep apnea has been controversial in human studies. Chronic intermittent hypoxia (CIH) is a rodent model, which mimics the hypoxemia experienced by patients with sleep apnea. Most studies of CIH in rats have been conducted in the Sprague Dawley rat strain. Previously published literature suggests different strains of rats exhibit various responses to disease models, and these effects can be further modulated by the housing conditions experienced by each strain. This variability in response is similar to what has been observed in clinical populations, especially with respect to the HPA system. To investigate if strain or housing (individual or pair-housed) can affect the results of CIH (AHI 8 or 10) treatment, we exposed individual and pair-housed Sprague Dawley and Long-Evans male rats to 7 days of CIH treatment. This was followed by biochemical analysis of circulating hormones, oxidative stress, and neurodegenerative markers. Both strain and housing conditions altered oxidative stress generation, hyperphosphorylated tau protein (tau tangles), circulating corticosterone and adrenocorticotropic hormone (ACTH), and weight metrics. Specifically, pair-housed Long-Evans rats were the most sensitive to CIH, which showed a significant association between oxidative stress generation and HPA activation under conditions of AHI of 8. These results suggest both strain and housing conditions can affect the outcomes of CIH.