Biology Commons^™

Pharmacologic Induction Of The Melanocotin 1 Receptor (Mc1r) Pathway Provides Protection Against Sunburn And Enhances Expression Of Antioxidant Enzymes In The Skin, Alexandra Amaro-Ortiz

Theses and Dissertations--Toxicology and Cancer Biology

The inability to tan properly after sun exposure strongly correlates with increased incidence of skin cancer. The melanocortin 1 receptor (MC1R) is a transmembrane Gs-coupled cell surface receptor found on epidermal melanocytes that transmits pro-survival and pro-differentiation signals mediated by the second messenger cAMP. Humans carrying loss-of-function polymorphisms in MC1R signaling exhibit higher incidences of skin cancers including melanoma.

This study focused on the physiologic effects of topical application of forskolin, an adenylate cyclase activator, in extension (Mc1r^e/e) K14-SCF animals, which model the fair-skinned UV-sensitive human. Twice daily application of the drug promoted accelerated pigmentation, increased skin darkening …

Klebsiella Pneumoniae Assimilates To Increasing Concentrations Of Cephalothin By Differential Outer Membrane Porin Expression And Increased Production Of Capsular Polysaccharides, Nghi B. Lam

UNF Undergraduate Capstone Projects and Honors Theses

Klebsiella pneumoniae is an opportunistic Gram-negative nonmotile bacteria that causes nosocomial infections. In these bacteria, nutrients as well as antibiotics are able to diffuse through the outer membrane via outer membrane porins, transmembrane protein channels. Loss of outer membrane porins, increased capsule production, and a highly mucoid phenotype are commonly observed among antibiotic resistant isolates of this pathogen. The goal of this study was to investigate changes in outer membrane porin expression and capsular polysaccharide production by K. pneumoniae as it transitions to a β-lactam antibiotic resistant phenotype. Klebsiella pneumoniae strain 43816, which is susceptible to β-lactam antibiotics such as …

Molecular And Biochemical Analysis Of Phenolic Acid Decarboxylase From Brettanomyces Yeast Isolates, Chad Lawerence Harris

UNF Undergraduate Capstone Projects and Honors Theses

Many strains of Brettanomyces pose a major threat to the commercial brewing industry by producing phenolic off-flavors, while a few strains contribute desirable characteristics in unique beer styles. This genus of yeast possesses a two-step pathway that converts hydroxycinnamic acids (HCAs) to vinyl and ethyl derivatives that add unwanted flavors and aromas to the final beverage. This project focused on analyzing Brettanomyces yeast isolates for variation in phenolic acid decarboxylase activity (PAD), which catalyzes the first step in the pathway. Each strain was grown in the three different common HCAs (ferulic acid, p-coumaric acid, caffeic acid) to understand each strain’s …

Anthropogenic Noise Alters Bat Activity Levels And Echolocation Calls, Jessie P. Bunkley, Christopher J.W. Mcclure, Nathan J. Kleist, Clinton D. Francis, Jesse R. Barber

Biology Faculty Publications and Presentations

Negative impacts from anthropogenic noise are well documented for many wildlife taxa. Investigations of the effects of noise on bats however, have not been conducted outside of the laboratory. Bats that hunt arthropods rely on auditory information to forage. Part of this acoustic information can fall within the spectrum of anthropogenic noise, which can potentially interfere with signal reception and processing. Compressor stations associated with natural gas extraction produce broadband noise 24 hours a day, 365 days a year. With over half a million producing gas wells in the U.S. this infrastructure is a major source of noise pollution across …

Fearscapes: Mapping Functional Properties Of Cover For Prey With Terrestrial Lidar, Peter J. Olsoy, Jennifer S. Forbey, Janet L. Rachlow, Jordan D. Nobler, Nancy F. Glenn, Lisa A. Shipley

Biology Faculty Publications and Presentations

Heterogeneous vegetation structure can create a variable landscape of predation risk—a fearscape—that influences the use and selection of habitat by animals. Mapping the functional properties of vegetation that influence predation risk (e.g., concealment and visibility) across landscapes can be challenging. Traditional ground-based measures of predation risk are location specific and limited in spatial resolution. We demonstrate the benefits of terrestrial laser scanning (TLS) to map the properties of vegetation structure that shape fearscapes. We used TLS data to estimate the concealment of prey from multiple vantage points, representing predator sightlines, as well as the visibility of potential predators from the …

Map Kinase Signaling In Plant Responses To Biotic Stress, Carlton James Bequette

Theses and Dissertations

Plants must be able to perceive and properly respond to a multitude of environmental conditions and produce appropriate cellular responses for optimal growth and reproduction. Mitogen-activated protein kinase (MAPK) phosphorylation cascades are critical components of signal transduction networks that mediate cellular responses to a wide range of both biotic and abiotic extracellular stimuli. This thesis presents an investigation of three novel aspects of MAPK signaling, the role of MAPKs in the regulation of cell death, the organization of MAPKs in a multi-protein complex, and the negative regulation of MAPKs by MAPK phosphatases. In tomato, three MAPKs play an essential role …

Novel Biochemical And Phenotypical Findings On The Nodal Signaling Components Lefty And Cripto, Amapola Balancio

Wayne State University Theses

ABSTRACT

NOVEL BIOCHEMICAL AND PHENOTYPICAL FINDINGS ON THE NODAL SIGNALING COMPONENTS LEFTY AND CRIPTO

by

Amapola Balancio

December 2014

Advisor: Dr. William Branford, Jr.

Major: Biological Sciences (Molecular and Developmental Biology)

Degree: Master of Science

Nodal, a Transforming Growth Factor-β (TGF-B), is a key regulator of proper development along with its atypical TGF-B inhibitor Lefty and its EGF-CFC co-receptor Cripto. Studies have shown that Nodal is unable to signal in the absence of a functional Cripto, indicating that it is a Nodal obligate co-receptor. In fact, one of the ways that Lefty prevents Nodal is by binding to Cripto and …

Acoustic Cues Of Physical Formidability In Cage Fighters, Stefan Mattias-Maria Goetz

Wayne State University Theses

Across the animal kingdom, the sex that experiences the most reproductive variance tends to evolve sexually dimorphic traits—both behavioral and morphological—which aid in reproduction. Human evolution has been marked by greater male intrasexual selection and as a result, men display a variety of secondary sexual characteristics, putatively serving to enhance biological fitness. Among these, fundamental frequency, closely related to perception of pitch, among men is half that of women. Likewise, monotonicity, that is, variance in pitch across an utterance, is higher in men (i.e., women show greater variance in pitch) while formant dispersion, which gives the voice its timbre, is …

The Contribution Of The Melanin Pathway To Overall Body Pigmentation Changes During Ontogenesis Of Periplaneta Americana, Thomas Roger Lemonds

Wayne State University Theses

Pigmentation is one of the most diverse and distinguishable features of insect morphology. The most prominent colors observed in insects are black or brown, whose production is attributed to the melanin pathway. At present, though, the contribution of this pathway to overall body pigmentation throughout ontogenesis is still lacking. To address this question we examined the roles of four key melanin genes (TH, DDC, ebony, and aaNAT), in embryonic and post-embryonic development of Periplaneta americana. Our results show show that while the melanin pathway plays no role during the earliest nymphal stages, it is required during the later stages of …

Cytokine Dynamics, Diagnosis And Treatment Of Neuroinflammation In Chronic Constriction Injury Rat Model, Kiran Vasudeva

Electronic Theses and Dissertations

Chronic neuropathic pain is a serious, worldwide health problem leading to life-long treatment and the possibility of significant disability. In this study, neuropathic pain was modeled using the chronic constriction injury (CCI) in rats. The CCI rats exhibited hypersensitivity (typical neuropathic pain symptom) to mechanical stimulation of the affected paw 11 days post-surgery, at a time when sham surgery animals did not. It is known that immune cells play a role in the development of neuropathic pain and to further explore the relationship between neuropathic pain and immune cells, we hypothesized that the infiltration of immune cells into the affected …

How Effective Are Cleanwave® Uv-C Portable Toothbrush Sanitizers In Removing Streptococcus Mitis From Toothbrushes?, Rafaila Ramirez

Undergraduate Research Journal

The oral cavity is home to a wide variety of microorganisms1. More than 700 bacterial species have been detected within the oral cavity. Thus, it is not surprising that some of these microorganisms are transferred to a toothbrush during use. Furthermore, studies have shown that various microorganisms can grow on toothbrushes after use. More microorganism development occurs on toothbrushes stored in a moist environment such as a closed container. Since toothbrushes can become a potential portal of entry for organisms, the purpose of this study was to see how effective the CleanWave® UV-C Portable Toothbrush Sanitizer was in re-moving the …

Biology 120-251w Fundamentals Of Nutrition 13 Week Online Spring 2015, Toni Burkhalter

Biology Courses

No abstract provided.

Biology 104 Environmental Biology Online Spring 2015, Ralph Bonati

Biology Courses

No abstract provided.

Biology 104 Environmental Biology Online Summer 2015, Heidi Leuszler

Biology Courses

No abstract provided.

Biology 104 Environmental Biology Online Summer 2015, Mike Retzer

Biology Courses

No abstract provided.

Biology 109 Introduction To Plant Biology Summer 2015, Ralph Bonati

Biology Courses

No abstract provided.

Biology 105 Human Biology Fall 2015, Rosetta Dalton

Biology Courses

No abstract provided.

Biology 111 Basic Anatomy And Physiology Fall 2015, Janine Prillaman

Biology Courses

No abstract provided.

Biology 104 Environmental Biology Fall 2015, Heidi Leuszler

Biology Courses

No abstract provided.

Biology 121 Anatomy And Physiology I Hybrid Fall 2015, Lori Garrett

Biology Courses

No abstract provided.

Biology 101 General Biology Spring 2015, Scott Siechen

Biology Courses

No abstract provided.

Biology 123 Microbiology Fall 2015, Vikki Crnekovic

Biology Courses

No abstract provided.

Biology 121 Anatomy And Physiology I Fall 2015, Bryan Krall, Valentina Mitev

Biology Courses

No abstract provided.

The Effects Of Curcumin On The Expression Of P53 And Bcl-2 Oncoproteins On The Human Breast Carcinoma Cell Line Mda-Mb 468, Angelin S. Shajan

Theses and Dissertations

We studied the effects of curcumin on the proliferation and viability of MDA-MB-468 breast cancer cells and its effects on the expression ofBcl-2 and p53 proteins in these cells. Based on previous studies, we predicted a dose-dependent increase in p53 (tumor suppressor) expression, and a decrease in Bcl-2 (anti-apoptotic oncoprotein) expression. Briefly, MDA-MB468 cells were seeded into 12-well plates at 2.0 * 104 cells/well and allowed to grow for 72 hrs. Cells were treated with curcumin at 0, 25, 50 and 100 pM in triplicate at time zero and cultured for another 24 hours. All data were obtained using a …

Habitat Eradication And Cropland Intensification May Reduce Parasitoid Diversity And Natural Pest Control Services In Annual Crop Fields, D. K. Letourneau, Sara G. Bothwell Allen, Robert R. Kula, Michael J. Sharkey, John O. Stireman Iii

Biological Sciences Faculty Publications

California’s central coast differs from many agricultural areas in the U.S., which feature large tracts of monoculture production fields and relatively simple landscapes. Known as the nation’s salad bowl, and producing up to 90% of U.S. production of lettuces, broccoli and Brussels sprouts, this region is a mosaic of fresh vegetable fields, coastal meadow, chaparral shrubs, riparian and woodland habitat. We tested for relationships between the percent cover of crops, riparian and other natural landscape vegetation and the species richness of parasitic wasps and flies foraging in crops, such as broccoli, kale and cauliflower, and interpreted our results with respect …

Continuing Progress Towards A Phylogeny Of Tachinidae, John O. Stireman Iii, James E. O'Hara, John K. Moulton, Pierfilippo Cerretti, Isaac S. Winkler, Jeremy D. Blaschke, Z. L. Burington

Biological Sciences Faculty Publications

Readers of this newsletter are likely familiar with our ongoing project to establish a framework phylogeny of world Tachinidae (see articles in The Tachinid Times 26 and 27). This collaborative project, involving myself, Jim O’Hara, Kevin Moulton, Pierfilippo Cerretti, Isaac Winkler and a long list of collaborating tachinidophiles was initiated in 2012 with funding from the U.S. National Science Foundation. Our goal is to produce a robust phylogenetic framework of Tachinidae that can be used to inform tachinid taxonomy, systematics research, and the patterns of tachinid evolution. In previous issues of The Tachinid Times we summarized our progress to date …

Full Issue: Volume 8, Number 2

The Science Journal of the Lander College of Arts and Sciences

No abstract provided.

Full Issue: Volume 9, Number 1

The Science Journal of the Lander College of Arts and Sciences

No abstract provided.

Development Of Neuroendocrine Components Of The Thyroid Axis In The Direct-Developing Frog Eleutherodactylus Coqui: Formation Of The Median Eminence And Onset Of Pituitary Tsh Production., David H. Jennings, Bryce Evans, James Hanken

SIUE Faculty Research, Scholarship, and Creative Activity

Direct-developing frogs lack, wholly or in part, a wide range of larval features found in metamorphosing species and form adult-specific features precociously, during embryogenesis. Most information on thyroid regulation of direct development relies on hormone manipulations; the ontogeny of many thyroid axis components has not been fully described. This analysis examines differentiation of the median eminence of the hypothalamus and production of thyroid-stimulating hormone (TSH) by the pituitary of the direct-developing frog Eleutherodactylus coqui. The median eminence is established two-thirds of the way through embryogenesis. Cells immunoreactive to human TSHb antibodies are first detected during embryogenesis and quantitative changes in …

Comparative Population Genetics Of Two Invading Ticks: Evidence Of The Ecological Mechanisms Underlying Tick Range Expansions, Robyn Nadolny, Holly Gaff, Jens Carlsson, David Gauthier

Biological Sciences Faculty Publications

Two species of ixodid tick, Ixodes affinis Neumann and Amblyomma maculatum Koch, are simultaneously expanding their ranges throughout the mid-Atlantic region of the US. Although we have some understanding of the ecology and life history of these species, the ecological mechanisms governing where and how new populations establish and persist are unclear. To assess population connectivity and ancestry, we sequenced a fragment of the 16S mitochondrial rRNA gene from a representative sample of individuals of both species from populations throughout the eastern US. We found that despite overlapping host preferences throughout ontogeny, each species exhibited very different genetic and geographic …