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Articles 1 - 5 of 5
Full-Text Articles in Life Sciences
Qualitative And Quantitative Characterization Of Epithelial Cell Mixtures Using Hormone Antibody Probes And Flow Cytometry, Luke Baldridge
Qualitative And Quantitative Characterization Of Epithelial Cell Mixtures Using Hormone Antibody Probes And Flow Cytometry, Luke Baldridge
Master of Science in Forensic Science Directed Research Projects
“Touch” DNA is evidence that consists of epidermal cells deposited by handling objects and it is becoming more common in evidence samples processed in crime labs. Because “touch” DNA evidence samples may be low-template DNA and are often mixtures, there is a need to both nondestructively estimate the amount of DNA present prior to DNA purification and to identify and characterize mixtures prior to DNA typing. The purpose of this study was to test the use of FITC-labeled anti-testosterone antibodies as a potential tool to estimate the number of contributors in two-, three-, and four-person mixtures of epidermal skin cells, …
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 …
Quantitative Pcr And Sanger Sequencing Of Mitochondrial Dna Recovered From Waterlogged Bone, Kailey Babcock
Quantitative Pcr And Sanger Sequencing Of Mitochondrial Dna Recovered From Waterlogged Bone, Kailey Babcock
Master of Science in Forensic Science Directed Research Projects
In forensic contexts, samples containing heavily fragmented DNA are commonly encountered. Compromised biological samples are especially prevalent in instances where human remains have been submerged in an aqueous environment for extended periods of time. Nuclear DNA is particularly vulnerable to the prolonged exposure to heat, moisture, and bacterial degradation that are prevalent in aquatic settings. Paired with the difficulty of recovering DNA from skeletal remains, which are often the only remaining component after the soft tissues have been stripped away, mitochondrial DNA (mtDNA) analysis serves as an invaluable alternative. In this multifaceted study, mtDNA analysis was performed on waterlogged bone …
Identification Of Compounds Causing Cellular Autofluorescence In Touch Samples, Elora C. Wall
Identification Of Compounds Causing Cellular Autofluorescence In Touch Samples, Elora C. Wall
Master of Science in Forensic Science Directed Research Projects
As DNA analysis has advanced and produced tests with higher sensitivities, attention has turned toward obtaining DNA profiles from cells left with fingermarks. Recent studies have reported that cells deposited within fingermarks can exhibit differences in autofluorescence emission in the ‘red’ region of the visible spectrum (e.g., between 650-670 nm), which can be used to differentiate contributor cell population and separate them before DNA profiles. Interestingly, this emission was not consistent to the individual day-to-day and likely not a genetically-controlled attribute of the contributor. Instead, this emission signature results from extended exposure of the skin to certain materials such as …
Comparison Of Semi-Automated And Manual Differential Separation Methods For Mock Sexual Assault Samples, Stephanie Rink
Comparison Of Semi-Automated And Manual Differential Separation Methods For Mock Sexual Assault Samples, Stephanie Rink
Master of Science in Forensic Science Directed Research Projects
In the event of a sexual assault, separation of suspect from victim DNA is possible through differential extraction if the evidentiary mixture consists of female epithelial cells and male spermatozoa. The basis of differential extraction is the differing properties of epithelial and sperm cell membranes, specifically the comparative sturdiness of the proteins making up the sperm head containing the male DNA. Effective retrieval and separation of male and female DNA fractions is important in generating high-quality STR profiles that can be utilized in identifying suspects in a sexual assault case. Differential extraction has been conventionally performed using Proteinase K (PK) …