Digital Commons Network^™

Interview No. 1488, Ruben E. Guerra

Combined Interviews

Mr. Guerra was born and raised in McAllen, TX. He speaks about how his family was one of the founding families in McAllen and started as a land clearing business. Mr. Guerra said both sides of his family came from different socioeconomic classes but each side was hardworking. He worked at a small convienience store his family owned during the summer when he was about eight to ten years old. When he was in the eighth grade, his family moved to El Paso at the urging of doctors who said his bother would die if he did not move to …

Volume 47, Number 47: July 14, 2010, University Of North Dakota

University Letter Archive

No abstract provided.

Lim-Domain Proteins Trip6 And Lpp Associate With Shelterin To Mediate Telomere Protection, Samantha A. Sheppard, Diego Loayza

Publications and Research

POT1 is the single stranded telomeric overhang binding protein, and is part of the shelterin complex, a group of six proteins essential for proper telomere function. The reduction or abrogation of POT1 DNA binding activity in mammalian cells results in telomere elongation, or activation of the ATR DNA damage response at telomeres. Therefore, overhang binding represents the functionally relevant activity of POT1. To better understand the roles of POT1, we sought to isolate proteins that interact with the DNA binding domain of the protein. A yeast two-hybrid screen was implemented using a C-terminal truncation termed POT1ΔC, retaining the DNA binding …

Synthesis, Functionalization And Characterization Of Dual Mode Nanoparticles For Biomedical Applications, Farah Radwan

Theses and Dissertations

Three different approaches were used to prepare dual mode nanoparticles using a previously described reverse micelle technique. Superparamagnetic Fe@FeOx core shell nanoparticles were chosen to be the magnetic component for all three dual mode systems. In the first type of particles, 2- amino-1,3- propane diol (APD) was used as a functionalization ligand to stabilize the surface of the particles and its functional amino group also provided a binding site for the attachment of a fluorescent probe. The TEM analysis showed that the APD coated particles have a size range of 8-13 nm while XPS and MALDI measurements confirmed the presence …

Passive Transfer Of Igg Anti-Gm1 Antibodies Impairs Peripheral Nerve Repair, Pablo H Lopez, Gang Zhang, Jiangyang Zhang, Helmar C Lehmann, John W Griffin, Ronald L Schnaar, Kazim A Sheikh

Faculty, Staff and Student Publications

Anti-GM1 antibodies are present in some patients with autoimmune neurological disorders. These antibodies are most frequently associated with acute immune neuropathy called Guillain-Barré syndrome (GBS). Some clinical studies associate the presence of these antibodies with poor recovery in GBS. The patients with incomplete recovery have failure of nerve repair, particularly axon regeneration. Our previous work indicates that monoclonal antibodies can inhibit axon regeneration by engaging cell surface gangliosides (Lehmann et al., 2007). We asked whether passive transfer of human anti-GM1 antibodies from patients with GBS modulate axon regeneration in an animal model. Human anti-GM1 antibodies were compared with other GM1 …

Factors Influencing The Abundance, Community Composition And Activity States Of Bacterioplankton From The Tidal Freshwater James River, Catherine Luria

Theses and Dissertations

Aquatic bacteria respond to changing environmental conditions through a variety of mechanisms including changes in abundance, shifts in community composition and variable activity states. In the tidal-freshwater James River, variation in bacterial abundance was linked to nutrient availability and autochthonous production with highest bacterial densities associated with low-nutrient, high-chlorophyll a conditions. Laboratory experiments revealed that bacterial growth rates were nutrient limited at the low-nutrient site, while co-limitation (nutrients, glucose, light) was apparent at the high nutrient site. Despite large differences in abundance, community composition was similar based on TRFLP and 16S rDNA pyrosequencing. Community similarity was lower among rRNA libraries …

Computer Simulation Of Metal-Organic Materials, Abraham C. Stern

USF Tampa Graduate Theses and Dissertations

Computer simulations of metal-organic frameworks are conducted to both

investigate the mechanism of hydrogen sorption and to elucidate a detailed,

molecular-level understanding of the physical interactions that can lead to successful

material design strategies. To this end, important intermolecular interactions are

identified and individually parameterized to yield a highly accurate representation

of the potential energy landscape. Polarization, one such interaction found to play a

significant role in H

2 sorption, is included explicitly for the first time in simulations

of metal-organic frameworks. Permanent electrostatics are usually accounted for by

means of an approximate fit to model compounds. The application of …

Geographic Variation In Life History Tactics, Adaptive Growth Rates, And Habitatspecific Adaptations In Phylogenetically Similar Species: The Eastern Fence Lizard, Sceloporus Undulatus Undulatus, And The Florida Scrub Lizard, Sceloporus Woodi, Travis R. Robbins

USF Tampa Graduate Theses and Dissertations

To understand the evolutionary and ecological significance of geographic variation in life

history traits, we must understand whether the patterns are induced through plastic or adaptive

responses. The Eastern Fence Lizard,

Sceloporus undulatus

, exhibits countergradient variation

(larger body sizes, et cetera, in northern, cooler environments; presumed adaptive) in life history

traits across its large geographic range. However, cogradient variation (the expected result from

a plastic response, although not necessarily inconsistent with adaptation) has been suggested as

a null hypothesis, especially on fine geographic scales because of relatively small environmental

changes. Here we focus on life history variation on a …

Assessing The Ability Of Soils And Sediment To Adsorb And Retain Cs-137 In Puerto Rico, Warner Ithier-Guzman

USF Tampa Graduate Theses and Dissertations

As part of the radioactive exercises taking place around the world anthropogenic radionuclides were introduce to Puerto Rico’s terrestrial and aquatic environments beginning in 1962. Two major projects took place in the island, the Rain Forest Project and the construction of a Boiling Superheat Nuclear Power Plant (BONUS). While in operation several accidental shutdowns occurred at the BONUS facility. One of these accidental shutdowns released 582 MBq into the nearby environment. Vieques an island located few miles east of the main island has received anthropogenic inputs of heavy metals resulting from military practices conducted by the US Navy. Due to …

Effect Of Hydrothermal Processing On Colour, Antioxidant And Free Radical Scavenging Capacities Of Edible Irish Brown Seaweeds, Gaurav Rajauria, Amit Jaiswal, Nissreen Abu-Ghannam, Shilpi Gupta

Articles

The effect of heat processing on change in colour (ΔE), level of bioactive compounds and overall antioxidant capacity in raw and heat processed Irish brown seaweeds was investigated. Raw seaweeds were heated at 85, 95, 100, 110 and 121 °C for 15 min in an autoclave and the samples were extracted with 60% methanol. Total phenol (TPC), total tannin (TTC), DPPH• scavenging and metal chelating ability (FIC) were significantly higher (p < 0.05) at 85 °C while the value of ΔE, total flavonoid (TFC), total sugar (TSC), lipid peroxidation and H2O2 scavenging capacity were higher at 95 °C, as compared to raw seaweeds, in all the species studied. Results showed that heat treatment affects not only the content of bioactive compounds in seaweeds but also beneficial biological activity associated with these compounds which can suggest new processing for the application of seaweeds extract as nutraceutical.

Biology Professor Receives Nih Grant To Continue Heart Development Research, Winthrop University

Winthrop News 2010

• The $419,115 grant continues through June 2013.
• Evans-Anderson came to Winthrop in 2008.

Tissue Material Process For Forming Bioprosthesis, Dan T. Simionescu, Narendra Vyavahare

Clemson Patents

A biomaterial useful for bioprostheses such as bioprosthetic heart valves is provided in which the fixed tissue has improved elastic properties. The high elastin-containing biomaterial is further characterized by having anisotropic properties wherein the biological material has a greater stiffness in one direction and a greater elasticity in a cross direction. For instance, the biological material has an elastin content of about 30% by weight. In one embodiment, the biological material is vena cava tissue.

Aqueous Suspension Of Nanoscale Drug Particles From Supercritical Fluid Processing, Ya-Ping Sun

Clemson Patents

The present invention is directed to an improved supercritical fluid processing technique that can be used to form particulate suspensions of biologically useful materials. The disclosed processes include variations of RESS processes. The disclosed processes do not form micelles of any stabilizing agents in the aqueous solution that receives the product materials following rapid expansion through a nozzle. In particular, stabilizing agents in the aqueous solution are either materials that will not form micelles in aqueous environments, or else they are materials that can form micelles, but are utilized at conditions that are insufficient for the formation of micelles or …

Uab In The News For July 13, 2010, Staff

Browse All News

No abstract provided.

The Daily Egyptian, July 13, 2010, Daily Egyptian Staff

July 2010

No abstract provided.

Unh Eelgrass (Zostera Marina) Monitoring Program For 2010-2014: Quality Assurance Project Plan, Frederick T. Short, Phil Trowbridge

PREP Reports & Publications

Eelgrass (Zostera marina) is essential to estuarine ecology because it filters nutrients and suspended particles from water, stabilizes sediments, provides food for wintering waterfowl, and provides habitat for juvenile fish and shellfish, as well as being the basis of an important estuarine food web. Healthy eelgrass both depends on and contributes to good water quality. The UNH Seagrass Ecology Lab, has mapped the distribution of eelgrass every year from 1986 through 2009 in the Great Bay. The entire Great Bay Estuary (Great Bay, Little Bay, tidal tributaries, Piscataqua River, Little Harbor, and Portsmouth Harbor) was mapped by these researchers in …

Molecular Evolution Of Glutamine Synthetase Ii: Phylogenetic Evidence Of A Non-Endosymbiotic Gene Transfer Event Early In Plant Evolution, Sohini Ghoshroy, Manfred Binder, Aurélien Tartar, Deborah L. Robertson

Biology

Background. Glutamine synthetase (GS) is essential for ammonium assimilation and the biosynthesis of glutamine. The three GS gene families (GSI, GSII, and GSIII) are represented in both prokaryotic and eukaryotic organisms. In this study, we examined the evolutionary relationship of GSII from eubacterial and eukaryotic lineages and present robust phylogenetic evidence that GSII was transferred from -Proteobacteria (Eubacteria) to the Chloroplastida. Results. GSII sequences were isolated from four species of green algae (Trebouxiophyceae), and additional green algal (Chlorophyceae and Prasinophytae) and streptophyte (Charales, Desmidiales, Bryophyta, Marchantiophyta, Lycopodiophyta and Tracheophyta) sequences were obtained from public databases. In Bayesian and maximum likelihood …

Matched Optical Waveforms For Detection And Identification Of Biological Pathogens., Peter Delfyett, Geoffrey Burdge, John Desalvo, Bruce Fitzgerald, Andreas Leven

UCF Patents

A method is provided for identifying a contaminant in a gaseous space. The method includes: generating a broadband optical waveform; shaping the optical waveform to match an expected waveform for a known contaminant; and transmitting the shaped optical waveform towards an unknown contaminant. Upon receiving a reflected optical waveform from the unknown contaminant, determining whether the unknown contaminant correlates to the known contaminant based on the reflected waveform.

Soundings 2010-07, N/A N/A

Soundings

No abstract provided.

A Macroscopic Study Of The Electrochemical Modeling Parameters Of A 6 Kw Pem Electrolyzer, Christian Y. F. Biaku

Theses and Dissertations

This study examined the thermodynamic electrochemistry of the process of proton exchange membrane electrolysis of a 6 kW electrolyzer manufactured by Proton Energy Systems. Each modeling parameter was examined based on the definition and the theories which characterize their behavior using experimental data generated at the University of North Dakota hydrogen laboratory. The exchange current densities, membrane resistance and charge transfer coefficients were examined at both electrodes for their temperature dependence. While most of the temperature studies revealed an Arrhenius behavior, the exchange current density at the anode showed a deviation. This leads me to believe that stacking cells together …

Gender Differences And Similarities In Perceptions And Experiences Of Secondary Public School Safety, Bryan K. Young

Theses and Dissertations

This study is a description of male and female secondary students' experiences of safety in public schools. Gender differences in reported victimization and perceptions of school safety have been noted. The National Center for Educational Statistics ([NCES], 2006) reported that boys were the victims of violent acts in the schools more often than girls. Many studies have reported different results relating to how safe students perceive their schools to be (Addington et al., 2002; Office of Educational Research and Improvement, 1997). This study considered gender differences and similarities in students' perceptions of school safety. The study utilized a qualitative research …

Impedance Imaging And Measurements By Micro Probes In Aqueous Environments, Tao Shang

Theses and Dissertations

The dissertation presented here describes two research projects that may, at first glance, seem unrelated. Their unifying principle is the measurement of electrical impedance for the detection and analysis of biological materials. Impedance measurements have long been employed and studied in scientific fields, and the dissertation begins with a summary of historical methodology, applications, and terminology. Utilizing impedance measurements for microscopic imaging is the driving motivation for Scanning Impedance Imaging (SII). This technique manifests the distribution of electrical impedance inside biological tissues and is described after the dissertation's introduction. SII can provide micron-scale imaging resolution by scanning a shielded microprobe …

July 13, 2010, The Daily Mississippian

Daily Mississippian (all digitized issues)

No abstract provided.

Does Electroacupuncture Affect Ethanol Modulation Of Mesolimbic Neurons?, Jung Jae Park

Theses and Dissertations

The purpose of this project was to investigate the mechanism of action of acupuncture on a critical neural substrate involved in alcoholism. Specifically, this study evaluated the effects of stimulation of the acupuncture Shenmen (HT7) point on inhibitory GABA neurons in the ventral tegmental area (VTA), a midbrain structure implicated in drug and alcohol abuse, and ethanol self-administration. In addition, the role of opioid receptors (ORs) in ethanol and acupuncture effects was explored. Using electrophysiological methods in mature rats, we evaluated the effects of HT7 stimulation and opioid antagonists on the VTA GABA neuron firing rate. With behavioral paradigms, we …

Pathogenic Role Of Phosphodiesterase Type 5 Upregulation In Cardiac Ischemia/Reperfusion Injury, Daniel Hobbs

Theses and Dissertations

Phosphodiesterase Type 5 (PDE5) inhibitors are cardioprotective against ischemia/reperfusion (I/R) injury. However, it remains uncertain if I/R affects PDE5. We hypothesized that generation of reactive oxygen species (ROS) during I/R leads to upregulation of PDE5, which contributes to pathological changes following acute myocardial infarction (AMI). Adult male ICR mice were subjected to 30 minutes of in vivo or ex vivo I/R. To examine the role of ROS, a subset of hearts were perfused with 100 µM hydrogen peroxide (H2O2). Expression and activity of PDE5, pPDE5, and cGMP-dependent protein kinase (PKG) were measured by Western blots and spectrophotometric assay. The results …

Book Reviews, Eric Bottelberghe, Cara Burnidge, Rachel Ozanne

Intermountain West Journal of Religious Studies

No abstract provided.

A Revisionary Approach To Cross-Curricular Literacy Work, Sandra L. Tarabochia

Department of English: Dissertations, Theses, and Student Research

In this dissertation, I use qualitative research methods to study relationships between compositionists and faculty in other disciplines in the context of cross-curricular literacy (CCL) work. Drawing on a two-year CCL project in the biology department, for which I was a participant observer, I argue that compositionists need to attend more carefully to issues that influence day-to-day interactions with disciplinary faculty in order to develop more meaningful CCL relationships. Toward that end, I offer a revisionary approach to cross-curricular literacy work that cultivates complex relationships by delaying consensus and embracing disconnection and disorientation. More specifically, I employ revisionary stance as …

The Common Pond Snail Lymnaea Stagnalis: Extracellular Fluid Recovery In Adults And Calcification And Lead Sensitivity During Embryonic Development, Sue C. Ebanks

Open Access Dissertations

Freshwater organisms are known to maintain hyperosmotic internal conditions despite outward diffusive loss of ions. The freshwater common pond snail Lymnaea stagnalis faces this challenge while additionally attaining the necessary ions for calcification. These are the first documented assessments of the time and mode of recovery for ions lost due to full-body withdrawal in adults of this species. Additionally, this document reports on the physiological and developmental onset of embryonic calcification and the commencement of active acquisition of shell-forming ions from the surrounding environment. The effect of water chemistry and lead (Pb) exposure on embryonic growth, development, and calcium (Ca …

Communiqué, July 12, 2010, Lindenwood University

Communiqué

The Communiqué was the faculty/staff newsletter for Lindenwood University/College from 1982 to 2016.

The Nature Of The O-2/O-5 Cooperative Effect And Its Role In Chemical Glycosylation, Laurel Kathryn Mydock

Dissertations

Since carbohydrates were first discovered, understanding the structure, reactivity, and function of these bioorganic compounds has remained of great priority. However, as the appreciation for the biological roles of carbohydrates intensifies, a growing demand for efficient and scalable methods towards the synthesis of these challenging molecules has become even more imperative. While modern synthetic techniques have allowed us to readily achieve most glycosidic linkages, it is the inability to effectively predict and control the stereoselectivity of the glycosylation reaction that has remained the synthetic hurdle. Herein, much effort has been placed in the investigation of “mixed-patterned” glycosyl donors as they …