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Full-Text Articles in Life Sciences
Estrogen's Effects On Oxidative Stress Levels In Glial Cells, Jacob J. Dirkman
Estrogen's Effects On Oxidative Stress Levels In Glial Cells, Jacob J. Dirkman
Theses and Dissertations
A decrease in astrocyte function and viability has been linked to many neurodegenerative diseases, including schizophrenia, major depressive disorders, Alzheimer’s disease, and Amyotrophic Lateral Sclerosis (ALS). Previous research indicates that some estrogens may have a positive effect on neuron and astrocyte viability. Estrogens’ effects on the brain are of interest as estrogens are commonly prescribed as hormone replacement therapy to reduce the symptoms of menopause in women. Unfortunately, these effects on are not completely understood. The goal of the project was to discover if estrogen has any protective effect on astrocytes exposed to oxidative stress. We measured the oxidative stress …
Phylogenetic Analyses Of Andean And Amazonian Tree Communities In Ecuador, Samantha J. Worthy
Phylogenetic Analyses Of Andean And Amazonian Tree Communities In Ecuador, Samantha J. Worthy
Theses and Dissertations
The forests of Ecuador are known for their high levels of diversity and endemism, classifying the country as a biodiversity hotspot. Both the western Amazon and Andean montane forests are richly populated with tropical tree species that have been little studied in a community phylogenetic context. The implementation of elevational transects and trait based analyses having proven useful in gaining a better understanding ofhow environmental factors are affecting the tree community structure in these habitats. The goal of this research was to evaluate the magnitude ofDNA barcode diversity among Amazonian and Andean tree species. Specifically, the objectives were to (1) …
The Involvement Of Estrogen Receptors In Astrocyte Survival, Lauren M. Johnson
The Involvement Of Estrogen Receptors In Astrocyte Survival, Lauren M. Johnson
Theses and Dissertations
Estrogens are a class of hormones that are demonstrated to be neuroprotective. The levels of estrogen in the body decline during menopause which can cause a variety of symptoms. Hormone replacement therapy (HRT) is a treatment option for menopause, however, it has been demonstrated to have adverse side effects. Of the treatment options for adverse side effects of HRT, Selective estrogen Down-regulators do not appear to have an agonist effects on estrogen receptors while Selective estrogen receptor Modulators do. The aim of this study was to determine the role that estrogen receptors play in the survival of astrocytes when placed …
Impact Of A Diesel Spill On Macroinvertebrate Communities In Ponds In S.E. Alabama, Usa, Katie E. Winkles
Impact Of A Diesel Spill On Macroinvertebrate Communities In Ponds In S.E. Alabama, Usa, Katie E. Winkles
Theses and Dissertations
No abstract provided.
The Effects Of Musical Intervals From Consonant To Dissonant On The Neural Activity Of Earthworms, Charley L. Weaver
The Effects Of Musical Intervals From Consonant To Dissonant On The Neural Activity Of Earthworms, Charley L. Weaver
Theses and Dissertations
Music is generated through vibrations of a medium creating what is perceived as tone. Two frequencies played simultaneously create intervals, and those ratios of frequencies determine what is consonant and dissonant. Studies have shown a greater neural response in human participants to consonant intervals (Bidelman and Heinz 2011, Bidelman and Krishnan 2009). In this study, the ventral nerve cord of Lumbricus terrestris was exposed to six dichotic intervals in the form of vibrations through a bass actuator. Nerve activity was recorded for amplitude (mV), duration (ms), and maximum depolarization (mV) of the action potential. There was no significant difference in …
Screening For Pathogenic Escherichia Coli In The Chattahoochee River, Columbus, Georgia, Micah A. Staples
Screening For Pathogenic Escherichia Coli In The Chattahoochee River, Columbus, Georgia, Micah A. Staples
Theses and Dissertations
Escherichia coli testing is frequently used to indicate the possible presence of harmful pathogens, but E. coli itself can be pathogenic. Serotype 0157:H7, enterohemorrhagic E. coli, is likely the most medically important pathogenic strain of E. coli in the United States. In this study, we surveyed for 0157:H7 and three strains of another pathogenic subtype: enterotoxigenic E. coli. We isolated E. coli colonies from samples taken from the Chattahoochee River in Columbus, Georgia at two different locations, above and below wastewater outputs. We used PCR to test for the individual subtypes and then used a nested PCR protocol for the …
Evaluating The Evolutionary And Genetic Relationships Of The Andean Orchids Of Northwestern Ecuador, Kylie Bucalo
Evaluating The Evolutionary And Genetic Relationships Of The Andean Orchids Of Northwestern Ecuador, Kylie Bucalo
Theses and Dissertations
DNA barcoding is a molecular based technique used to separate and identify individual species. Here we establish a DNA Barcode library for the orchid flora of an Andean cloud forest in Northwestern Ecuador. The library contains 135 matK and 136 rbcL DNA Barcodes representing over 33 Orchidaceae genera. Sequence analysis shows percent species resolution was higher for matK (98.8%) than rbcL (70.24%), with a large portion of the unresolved species for the rbcL loci coming from taxonomically complex genera in the subtribe Pleurothallidinae. Neighbor Joining (NJ) trees revealed that the orchid flora of Siempre Verde is divided taxonomically into two …
The Loss Of Methanol Utilization In Methylobacteria, Justin T. Skariah
The Loss Of Methanol Utilization In Methylobacteria, Justin T. Skariah
Theses and Dissertations
Methylobacteria primary uses Cl substrates as a carbon and energy source. This experiment was performed to see if Methylobacteria would lose the ability to use Cl compound methanol after prolonged exposure to multi-carbon substrates. To determine this, the bacteria was grown on MR2A3 (multi-carbon substrates) and MOM (single-carbon substrates) for multiple generations and tested for loss of function on a series of generations. These tests include streaking plates of MOM and R2A with bacteria from MR2A3 then getting a bacterial colony count and also toothpick transfers of the colonies to verify findings. After 20 generations there were no significant decrease …