Physical Sciences and Mathematics Commons^™

First Proof Of Concept Of Sustainable Metabolite Production From High Solids Fermentation Of Lignocellulosic Biomass Using A Bacterial Co-Culture And Cycling Flush System, Wanying Yao, Sue E. Nokes

Biosystems and Agricultural Engineering Faculty Publications

To improve the lignocellulose conversion for ABE in high solids fermentation, this study explored the feasibility of cycling the process through the cellulolytic or/and solventogenic phases via intermittent flushing of the fermentation media. Five different flushing strategies (varying medium ingredients, inoculum supplement and cycling through phases) were investigated. Flushing regularly throughout the cellulolytic phase is necessary because re-incubation at 65 °C significantly improved glucose availability by at least 6-fold. The solvents accumulation was increased by 4-fold using corn stover (3-fold using miscanthus) over that produced by flushing only through the solventogenic phase. In addition, cycling process was simplified by re-incubating …

Catechol Oxidation By Ozone And Hydroxyl Radicals At The Air-Water Interface, Elizabeth A. Pillar, Robert C. Camm, Marcelo I. Guzman

Chemistry Faculty Publications

Anthropogenic emissions of aromatic hydrocarbons promptly react with hydroxyl radicals undergoing oxidation to form phenols and polyphenols (e.g., catechol) typically identified in the complex mixture of humic-like substances (HULIS). Because further processing of polyphenols in secondary organic aerosols (SOA) can continue mediated by a mechanism of ozonolysis at interfaces, a better understanding about how these reactions proceed at the air–water interface is needed. This work shows how catechol, a molecular probe of the oxygenated aromatic hydrocarbons present in SOA, can contribute interfacial reactive species that enhance the production of HULIS under atmospheric conditions. Reactive semiquinone radicals are quickly produced upon …

Interactive Comment On “Iodine Oxide In The Global Marine Boundary Layer” By C. Prados-Roman Et Al., Marcelo I. Guzman

Chemistry Faculty Publications

No abstract provided.

Persistent Hepatic Structural Alterations Following Nanoceria Vascular Infusion In The Rat, Michael T. Tseng, Qiang Fu, Khoua Lor, G. Rafael Fernandez-Botran, Zhong-Bin Deng, Uschi M. Graham, D. Allan Butterfield, Eric A. Grulke, Robert A. Yokel

Chemistry Faculty Publications

Understanding the long-term effects and possible toxicity of nanoceria, a widely utilized commercial metal oxide, is of particular importance as it is poised for development as a therapeutic agent based on its autocatalytic redox behavior. We show here evidence of acute and subacute adverse hepatic responses, after a single infusion of an aqueous dispersion of 85 mg/kg, 30 nm nanoceria into Sprague Dawley rats. Light and electron microscopic evidence of avid uptake of nanoceria by Kupffer cells was detected as early as 1 hr after infusion. Biopersistent nanoceria stimulated cluster of differentiation 3⁺ lymphocyte proliferation that intermingled with nanoceria-containing …

A Low Temperature Nonlinear Optical Rotational Anisotropy Spectrometer For The Determination Of Crystallographic And Electronic Symmetries, Darius H. Torchinsky, Hao Chu, Tongfei Qi, Gang Cao, David Hsieh

Center for Advanced Materials Faculty Publications

Nonlinear optical generation from a crystalline material can reveal the symmetries of both its lattice structure and underlying ordered electronic phases and can therefore be exploited as a complementary technique to diffraction based scattering probes. Although this technique has been successfully used to study the lattice and magnetic structures of systems such as semiconductor surfaces, multiferroic crystals, magnetic thin films, and multilayers, challenging technical requirements have prevented its application to the plethora of complex electronic phases found in strongly correlated electron systems. These requirements include an ability to probe small bulk single crystals at the μm length scale, a need …

Transparent Conducting Oxides: A Δ-Doped Superlattice Approach, Valentino R. Cooper, Sung S. Ambrose Seo, Suyoun Lee, Jun Sung Kim, Woo Seok Choi, Satoshi Okamoto, Ho Nyung Lee

Physics and Astronomy Faculty Publications

Metallic states appearing at interfaces between dissimilar insulating oxides exhibit intriguing phenomena such as superconductivity and magnetism. Despite tremendous progress in understanding their origins, very little is known about how to control the conduction pathways and the distribution of charge carriers. Using optical spectroscopic measurements and density-functional theory (DFT) simulations, we examine the effect of SrTiO3 (STO) spacer layer thickness on the optical transparency and carrier distribution in La δ-doped STO superlattices. We experimentally observe that these metallic superlattices remain highly transparent to visible light; a direct consequence of the appropriately large gap between the O 2p and Ti 3d …

Numerical Investigation Of Pyrolysis Gas Blowing Pattern And Thermal Response Using Orthotropic Charring Ablative Material, Haoyue Weng, Alexandre Martin

Mechanical Engineering Faculty Publications

An orthotropic material model is implemented in a three-dimensional material response code, and numerically studied for charring ablative material. Model comparison is performed using an iso-Q sample geometry. The comparison is presented using pyrolysis gas streamlines and time series of temperature at selected virtual thermocouples. Results show that orthotropic permeability affects both pyrolysis gas flow and thermal response, but orthotropic thermal conductivity essentially changes the thermal performance of the material. The effect of orthotropic properties may have practical use such that the material performance can be manipulated by altering the angle of orthotropic orientation.

Numerical Study Of Spallation Phenomenon In An Arc-Jet Environment, Raghava Davuluri, Alexandre Martin

Mechanical Engineering Faculty Publications

The spallation phenomenon might affect the aerodynamic heating rates of re-entry vehicles. To investigate spallation effects, a code is developed to compute the dynamics of spalled particles. The code uses a finite-rate chemistry model to study the chemical interactions of the particles with the flow field. The spallation code is one-way coupled to a CFD solver that models the hypersonic flow field around an ablative sample. Spalled particles behavior is numerically studied for argon and air flow field. The chemistry model is compared with that of Park's model which complies with oxidation and sublimation and shows disagreement for nitridation.

Ferromagnetic Resonance Study Of Eightfold Artificial Ferromagnetic Quasicrystals, Vinayak Shantaram Bhat, J. Sklenar, J. Woods, B. Farmer, J. B. Ketterson, Jeffrey Todd Hastings, Lance E. De Long

Physics and Astronomy Faculty Publications

We have performed broadband (10 MHz–18 GHz) and narrowband (9.7 GHz) ferromagnetic resonance (FMR) measurements on permalloy thin films patterned with quasiperiodic Ammann tilings having eightfold rotational symmetry. We observed highly reproducible mode structures in the low-frequency, hysteretic regime in which domain walls and unsaturated magnetization textures exist. A minimum of 10 robust modes were observed in patterned samples, compared to the single uniform mode observed in unpatterned permalloy films. The field dependence and approximate eightfold rotational symmetry of the FMR spectra are in good agreement with micromagnetic simulations that confirm the importance of patterning for controlling static and dynamic …

Co2 Recycling Using Microalgae For The Production Of Fuels, Michael H. Wilson, John Groppo, Andrew Placido, S. Graham, S. A. Morton Iii, Eduardo Santillan-Jimenez, Aubrey Shea, Mark Crocker, Czarena Crofcheck, Rodney Andrews

Center for Applied Energy Research Faculty and Staff Publications

CO₂ capture and recycle using microalgae was demonstrated at a coal-fired power plant (Duke Energy’s East Bend Station, Kentucky). Using an in-house designed closed loop, vertical tube photobioreactor, Scenedesmus acutus was cultured using flue gas as the CO₂ source. Algae productivity of 39 g/(m² day) in June–July was achieved at significant scale (18,000 L), while average daily productivity slightly in excess of 10 g/(m² day) was demonstrated in the month of December. A protocol for low-cost algae harvesting and dewatering was developed, and the conversion of algal lipids—extracted from the harvested biomass—to diesel-range hydrocarbons via catalytic …

Poster Session, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

1. Grading a Watershed? Patrick Creager, Eastern Kentucky University, Richmond, KY
2. Permeability Heterogeneity and Its Effects on Hyporheic Zone Exchange, Timothy Pryshlak and Audrey Sawyer, Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY
3. Effects of Atrazine on the Chemical Alarm Cue Response in Longear Sunfish (Lepomis megalottis), Ben M. Adams and Ben F. Brammell, Natural Sciences Department, Asbury University, Wilmore, KY
4. New Features Available on the Kentucky Groundwater Data Repository, Bart Davidson and others, Kentucky Geological Survey, University of Kentucky, Lexington, KY
5. Removal of Persistent Organic Pollutants from Contaminated Water Sources Utilizing Polyphenol- Functionalized Magnetic …

Session 2c, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Results of the Statewide Groundwater Pathogen Study, Susan L. Mallette, Kentucky Division of Water, Frankfort, KY
• Changes in Nutrients and E. coli During Two Storm Events in Hinkston Creek, KY, Tiffany Hunter and Brian Reeder, Institute for Regional Analysis and Public Policy, Morehead State University, Morehead, KY
• Engaging Partners in the Cane Run Watershed, Carol Hanley and others, College of Agriculture, Food and Environment, University of Kentucky, Lexington, KY
• The University of Kentucky Environmental Research and Training Lab is Available for Your Use, Tricia Coakley, Environmental Research Training Lab, University of Kentucky, Lexington, KY

Session 2b, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Watershed-Scale Stable Isotope Simulation of the Fluvial Organic Carbon Budget Using the ISOFLOC Model, William Ford and Jimmy Fox, Department of Civil Engineering, University of Kentucky, Lexington, KY
• Time Average Velocity Characteristics of Decelerating Open Channel Flows, Robert Stewart and Jimmy Fox, Department of Civil Engineering, University of Kentucky, Lexington, KY
• Spatiotemporal Relevance of Soil Moisture's Interaction with Measured Soil-Terrain Parameters, Carla Landrum and others, Lexington, KY
• Transport of Agricultural Contaminants through a Karst Soil, Carl Bolster and others, Food Animal Environmental Research Unit, USDA-ARS, Bowling Green, KY

Session 2a: Panel Discussion: Developing Post-Incident Risk Communication Guidelines For Intentional Water Contamination Events, Chike Anyaegbunam, Charles B. Madinger, Pamela Cupp, Shari R. Veil, Timothy L. Sellnow, Anna Goodman Hoover

Kentucky Water Resources Annual Symposium

This panel will discuss emerging findings from a US EPA-funded research project intended to improve risk communication for post-incident decontamination and clearance activities associated with intentional contamination of a water system. The session will center around Phase II of the study, which focuses on extending the Phase I case study findings that were presented at last year’s KWRRI Symposium, to identify ways in which disparate stakeholder groups in metropolitan areas differentially perceive risk and subsequent risk communication efforts.

Session 1c, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Curry's Fork Watershed Plan: Data Pondering, Engaging Expert Advice, Cleaner Water Plans, Carolyn Cromer and others, Oldham County Fiscal Court, LaGrange, KY
• Overall Stream Function, Hydraulically and Ecologically (Opportunity Meets Necessity), Wanda Lawson and Oakes Routt, Stantec Consulting Services Inc., Louisville, KY
• Improving Urban Stream Water Quality through Stream Restoration at Montessori Middle School of Kentucky (MMSK), Pre-Restoration Water Quality and Bank Erosion Monitoring, Eric Dawalt and Arthur Parola, EcoGro/Ridgewater and the Stream Institute at the University of Louisville
• Improving Urban Stream Water Quality through Stream Restoration at Montessori Middle School of Kentucky (MMSK), Design and Construction …

Session 1b, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Improving Karst Sinkhole Mapping in Kentucky Using LiDAR, Junfeng Zhu and others, Kentucky Geological Survey, University of Kentucky, Lexington, KY
• "Dividing Ridges" in Light of LiDAR: A Closer Look at Some of Kentucky's Watershed Boundaries, Demetrio Zourarakis, Kentucky Division of Geographic Information, Frankfort, KY
• Horse Park Karst Water Instrumentation System (KWIS) Monitoring Station, Jim Currens and others, Kentucky Geological Survey, University of Kentucky, KY
• Formation Water Chemistry of Cambrian-Ordovician Knox Group Strata, KGS-Hansen Aggregates No. 1 Well, Carter County, Kentucky, T. M. Parris and others, Kentucky Geological Survey, University of Kentucky, Lexington, KY

Session 1a, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Water Quality Studies in the Kentucky Coalfields: The Trend Station Program, Richard J. Wahrer, Kentucky Department for Natural Resources, Frankfort, KY
• Water Quality Studies in the Kentucky Coalfields: A Closer Look at Pigeonroost Fork, Martin County, KY, Richard J. Wahrer, Kentucky Department for Natural Resources, Frankfort, KY
• Water Quality Monitoring of the McConnell Springs Stormwater Quality Wetland Pond and Gainesway Pond Retrofit Project, 2010-2013, David Price and Susan Pluegar, Lexington-Fayette County Government, Division of Water Quality, Lexington, KY
• Water Quality Monitoring of McConnell Springs, Lexington, KY, David Price, Lexington-Fayette County Government, Division of Water Quality, Lexington, …

Plenary Session, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Using Microbial-Source Tracking to Investigate Sources of Fecal Contamination in the South Fork Little River Basin, Hopkinsville, Kentucky, Angie Crain and Mac Cherry, USGS Kentucky Water Science Center, Louisville, KY
• Application of Nitrogen and Oxygen Isotopes in Tracing Nitrate Sources in the South Fork Little River Basin, Hopkinsville, Kentucky, Angie Crain and Mac Cherry, USGS Kentucky Water Science Center, Louisville, KY
• Kentucky StreamStats Water-Resources Web Application: Enhancements and Implementation of Selected Low- and Mean-Flow Estimating Equations, Gary Martin, USGS Kentucky Water Science Center, Louisville, KY
• Kentucky Division of Water's Risk Communication Toolbox, Annemarie Cason and Kristen …

Proceedings Of 2014 Kentucky Water Resources Annual Symposium, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

This symposium was planned and conducted as a part of the state water resources research institute annual program that is supported by Grant/Cooperative Agreement Number G11AP20081 from the United States Geological Survey. The contents of this proceedings document and the views and conclusions presented at the symposium are solely the responsibility of the individual authors and presenters and do not necessarily represent the official views of the USGS or of the symposium organizers and sponsors. This publication is produced with the understanding that the United States Government is authorized to reproduce and distribute reprints for government purposes.

Phanerochaete Chrysosporium Pretreatment Of Biomass To Enhance Solvent Production In Subsequent Bacterial Solid-Substrate Cultivation, Wanying Yao, Sue E. Nokes

Biosystems and Agricultural Engineering Faculty Publications

This study investigated pretreatment of corn stover using solid substrate cultivation (SSC) of Phanerochaete chrysosporium (P. chrysosporium) to improve subsequent accessibility to cellulose. Thereafter, Clostridium thermocellum (C. thermocellum) was directly inoculated onto the pretreated biomass to accomplish hydrolysis, followed by solventogenesis by introducing Clostridium beijerinckii (C. beijerinckii).

An enzyme suite containing laccase, lignin peroxidase and manganese peroxidase activity was detected during the cultivation of P. chrysosporium on corn stover within 288 h at an initial moisture content 𝓌_H2O = 80% (mass of water/total mass). Incubation factors, such as substrate moisture content and cultivation …

Tunneling Into The Mott Insulator Sr2Iro4, John A. Nichols, Noah Bray-Ali, Armin Ansary, Gang Cao, Kwok-Wai Ng

Center for Advanced Materials Faculty Publications

We studied the single-layered iridate Sr₂IrO₄ with a scanning tunneling microscope. The finite low temperature conductance enables the electronic structure of this antiferromagnetic Mott insulator to be measured by tunneling spectroscopy. We imaged the topography of freshly cleaved surfaces and measured differential tunneling conductance at cryogenic temperatures. We found the Mott gap in the tunneling density of states to be 2Δ=615 meV. Within the Mott gap, additional shoulders are observed which are interpreted as inelastic loss features due to magnons.

Kentucky Water Resources Research Institute Annual Technical Report Fy 2013, Kentucky Water Resources Research Institute, University Of Kentucky

KWRRI Annual Technical Reports (USGS’s 104b Grant Program)

The FY 2013 Annual Technical Report for Kentucky consolidates reporting requirements of the Section 104(b) base grant award into a single document that includes: 1) a description of Kentucky Information Transfer activities, 2) citations for related publications, 3) a summary of student support during the reporting period, 4) notable awards and achievements during the year, and 5) publications from prior year projects.

No funds were requested for general program administration activities. However, travel funds were provided to support the participation of the Director and the Associate Director in the annual meeting of the National Institutes for Water Resources in Washington, …

Modification Of Plasmonic Nano Structures' Absorption And Scattering Under Evanescent Wave Illumination Above Optical Waveguides Or With The Presence Of Different Material Nano Scale Atomic Force Microscope Tips, Gazi Mostafa Huda

Theses and Dissertations--Electrical and Computer Engineering

The interaction of an evanescent wave and plasmonic nanostructures are simulated in Finite Element Method. Specifically, the optical absorption cross section (C_abs) of a silver nanoparticle (AgNP) and a gold nanoparticle (AuNP) in the presence of metallic (gold) and dielectric (silicon) atomic force microscope (AFM) probes are numerically calculated in COMSOL. The system was illuminated by a transverse magnetic polarized, total internally reflected (TIR) waves or propagating surface plasmon (SP) wave. Both material nanoscale probes localize and enhance the field between the apex of the tip and the particle. Based on the absorption cross section equation the author …

Reference Compensation For Localized Surface-Plasmon Resonance Sensors, Neha Nehru

Theses and Dissertations--Electrical and Computer Engineering

Noble metal nanoparticles supporting localized surface plasmon resonances (LSPR) have been extensively investigated for label free detection of various biological and chemical interactions. When compared to other optical sensing techniques, LSPR sensors offer label-free detection of biomolecular interactions in localized sensing volume solutions. However, these sensors also suffer from a major disadvantage – LSPR sensors remain highly susceptible to interference because they respond to both solution refractive index change and non-specific binding as well as specific binding of the target analyte. These interactions can severely compromise the measurement of the target analyte in a complex unknown media and hence limit …

Addressing Public Health Risks Of Persistent Pollutants Through Nutritional Modulation And Biomimetic Nanocomposite Remediation Platforms, Bradley J. Newsome

Theses and Dissertations--Chemistry

Due to their relative chemical stability and ubiquity in the environment, chlorinated organic contaminants such as polychlorinated biphenyls (PCBs) pose significant health risks and enduring remediation challenges. Engineered nanoparticles (NPs) provide a novel platform for sensing/remediation of these toxicants, in addition to the growing use of NPs in many industrial and biomedical applications, but there remains concern for their potential long-term health effects. Research highlighted herein also represents a transdisciplinary approach to address human health challenges associated with exposure to PCBs and NPs. The objectives of this dissertation research are two-fold, 1) to develop effective methods for capture/sensing and remediation …

Quantification Of Factors Governing Drug Release Kinetics From Nanoparticles: A Combined Experimental And Mechanistic Modeling Approach, Kyle Daniel Fugit

Theses and Dissertations--Pharmacy

Advancements in nanoparticle drug delivery of anticancer agents require mathematical models capable of predicting in vivo formulation performance from in vitro characterization studies. Such models must identify and incorporate the physicochemical properties of the therapeutic agent and nanoparticle driving in vivo drug release. This work identifies these factors for two nanoparticle formulations of anticancer agents using an approach which develops mechanistic mathematical models in conjunction with experimental studies.

A non-sink ultrafiltration method was developed to monitor liposomal release kinetics of the anticancer agent topotecan. Mathematical modeling allowed simultaneous determination of drug permeability and interfacial binding to the bilayer from release …