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Some Physical Implications Of Regularization Ambiguities In Su(2) Gauge-Invariant Loop Quantum Cosmology, Klaus Liegener, Parampreet Singh Dec 2019

Some Physical Implications Of Regularization Ambiguities In Su(2) Gauge-Invariant Loop Quantum Cosmology, Klaus Liegener, Parampreet Singh

Faculty Publications

The way physics of loop quantum gravity is affected by the underlying quantization ambiguities is an open question. We address this issue in the context of loop quantum cosmology using gauge-covariant fluxes. Consequences are explored for two choices of regularization parameters: μ0 and μ in the presence of a positive cosmological constant, and two choices of regularizations of the Hamiltonian constraint in loop quantum cosmology: The standard and the Thiemann regularization. We show that novel features of singularity resolution and bounce, occurring due to gauge-covariant fluxes, exist also for Thiemann-regularized dynamics. The μ0 scheme is found to be unviable as …

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A New Climbing Shrew From Sulawesi Highlights The Tangled Taxonomy Of An Endemic Radiation, Jacob A. Esselstyn, Anang S. Achmadi, Heru Handika, Thomas C. Giarla, Kevin C. Rowe Dec 2019

A New Climbing Shrew From Sulawesi Highlights The Tangled Taxonomy Of An Endemic Radiation, Jacob A. Esselstyn, Anang S. Achmadi, Heru Handika, Thomas C. Giarla, Kevin C. Rowe

Faculty Publications

We describe a new species of Crocidura (Soricidae) from Sulawesi Island, Indonesia, documenting its novelty with both genetic and morphological characters. The new species is widespread on the island, with vouchered records from nine general localities distributed among five of the island's areas of endemism. Morphologically, the new species is readily distinguished from all other described Sulawesi Crocidura by its intermediate body size, gray pelage, and long, hairy tail. The new species was mainly captured in pitfalls placed in the ground, but we also obtained evidence that it readily climbs trees and may be scansorial in its locomotor habits. Populations …

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Concentrations, Sources, And Health Risks Of Particulate Matter In Southeast Us.: Current Status And Future Changes, Fenglin Han Dec 2019

Concentrations, Sources, And Health Risks Of Particulate Matter In Southeast Us.: Current Status And Future Changes, Fenglin Han

LSU Doctoral Dissertations

Evaluation of long-term air quality trends and prediction of future air quality may help to design and demonstrate effectiveness of control strategies and guide future air quality management. As one of the six criteria air pollutants (CAPs) regulated by the US Environmental Protection Agency (EPA), particulate matter with aerodynamic diameter of 2.5 µm or less (PM2.5) is of great interests since it has adverse effects on human health, visibility and climate. This study aims to understand the current status and future changes in concentrations, sources, and health risks of PM2.5 in Southeast US. Firstly, observations were analyzed …

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Divergent Trophic Responses Of Sympatric Penguin Species To Historic Anthropogenic Exploitation And Recent Climate Change, Kelton W. Mcmahon, Chantel I. Michelson, Tom Hart, Matthew D. Mccarthy, William P. Patterson, Michael J. Polito Dec 2019

Divergent Trophic Responses Of Sympatric Penguin Species To Historic Anthropogenic Exploitation And Recent Climate Change, Kelton W. Mcmahon, Chantel I. Michelson, Tom Hart, Matthew D. Mccarthy, William P. Patterson, Michael J. Polito

Faculty Publications

No abstract provided.

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Contrasting Regional Soil Alteration Across The Topographic Dichotomy Of Mars, D. R. Hood, S. Karunatillake, O. Gasnault, A. J. Williams, B. Dutrow, L. Ojha, S. Kobs, K. Kim, J. Heldmann, C. Fralick Dec 2019

Contrasting Regional Soil Alteration Across The Topographic Dichotomy Of Mars, D. R. Hood, S. Karunatillake, O. Gasnault, A. J. Williams, B. Dutrow, L. Ojha, S. Kobs, K. Kim, J. Heldmann, C. Fralick

Faculty Publications

©2019. American Geophysical Union. All Rights Reserved. Landscapes on either side of the martian topographic dichotomy bear distinct soil chemistry, but the processes associated with this distinction remain poorly understood. Here, correlation of soil chemistry at global to regional scales is examined with multivariate analysis of Gamma-Ray Spectrometer chemical maps and the Thermal Emission Spectrometer-derived Dust Cover Index (DCI). In the analysis, the northern lowlands show a strong S-Cl correlation, contrasting with the southern highlands, which show a stronger S-H2O correlation. These observations suggest aqueous interaction with soils throughout the southern highlands, preferentially dissolving Cl compounds and weakening S-Cl correlation. …

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Transcriptome-Wide Association Study Identifies Putative Elicitors/Suppressor Of Puccinia Graminis F. Sp. Tritici That Modulate Barley Rpg4-Mediated Stem Rust Resistance, Roshan Sharma Poudel, Jonathan Richards, Subidhya Shrestha, Shyam Solanki, Robert Brueggeman Dec 2019

Transcriptome-Wide Association Study Identifies Putative Elicitors/Suppressor Of Puccinia Graminis F. Sp. Tritici That Modulate Barley Rpg4-Mediated Stem Rust Resistance, Roshan Sharma Poudel, Jonathan Richards, Subidhya Shrestha, Shyam Solanki, Robert Brueggeman

Faculty Publications

Background: Stem rust is an economically important disease of wheat and barley. However, studies to gain insight into the molecular basis of these host-pathogen interactions have primarily focused on wheat because of its importance in human sustenance. This is the first extensive study utilizing a transcriptome-wide association mapping approach to identify candidate Puccinia graminis f. sp. tritici (Pgt) effectors/suppressors that elicit or suppress barley stem rust resistance genes. Here we focus on identifying Pgt elicitors that interact with the rpg4-mediated resistance locus (RMRL), the only effective source of Pgt race TTKSK resistance in barley. Results: Thirty-seven Pgt isolates showing differential …

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Microcanonical Analysis Of Boltzmann And Gibbs Entropies In Trapped Cold Atomic Gases, Kenneth J. Higginbotham, Daniel E. Sheehy Dec 2019

Microcanonical Analysis Of Boltzmann And Gibbs Entropies In Trapped Cold Atomic Gases, Kenneth J. Higginbotham, Daniel E. Sheehy

Faculty Publications

We analyze a gas of noninteracting fermions confined to a one-dimensional harmonic oscillator potential, with the aim of distinguishing between two proposed definitions of the thermodynamic entropy in the microcanonical ensemble, namely the standard Boltzmann entropy and the Gibbs (or volume) entropy. The distinction between these two definitions is crucial for systems with an upper bound on allowed energy levels, where the Boltzmann definition can lead to the notion of negative absolute temperature. Although negative temperatures do not exist for the system of fermions studied here, we still find a significant difference between the Boltzmann and Gibbs entropies, and between …

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Pretreatment Of Waste Biomass In Deep Eutectic Solvents: Conductive Heating Versus Microwave Heating, Narendra Kumar, Pranjali D. Muley, Dorin Boldor, Gary G. Coty, Joan G. Lynam Dec 2019

Pretreatment Of Waste Biomass In Deep Eutectic Solvents: Conductive Heating Versus Microwave Heating, Narendra Kumar, Pranjali D. Muley, Dorin Boldor, Gary G. Coty, Joan G. Lynam

Faculty Publications

Deep Eutectic Solvents (DESs) have recently emerged as an environmentally-friendly way to separate lignin from cellulose and hemicellulose in recalcitrant biomass prior to enzymatic hydrolysis to enhance glucose yields. Rice hulls, a widely-available secondary agricultural residue was pretreated with FA: CC (formic acid and choline chloride in a 2:1 mol ratio) using conductive heating and microwave heating. Pretreated biomass using either heating technique gave glucose titers 100 times higher than raw rice hulls after enzymatic hydrolysis. FTIR analysis shows similar findings for both heating techniques. For biomass pretreatment using DESs, microwave heating requires less than half of the energy (0.10 …

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Monitoring The Growth Dynamics Of Colloidal Gold-Silver Core-Shell Nanoparticles Using In Situ Second Harmonic Generation And Extinction Spectroscopy, Jeewan C. Ranasinghe, Asela S. Dikkumbura, Prakash Hamal, Min Chen, Rami A. Khoury, Holden T. Smith, Kenneth Lopata, Louis H. Haber Dec 2019

Monitoring The Growth Dynamics Of Colloidal Gold-Silver Core-Shell Nanoparticles Using In Situ Second Harmonic Generation And Extinction Spectroscopy, Jeewan C. Ranasinghe, Asela S. Dikkumbura, Prakash Hamal, Min Chen, Rami A. Khoury, Holden T. Smith, Kenneth Lopata, Louis H. Haber

Faculty Publications

© 2019 Author(s). The growth dynamics of gold-silver core-shell (Au@Ag) nanoparticles are studied using in situ time-dependent second harmonic generation (SHG) and extinction spectroscopy to investigate the nanoparticle shell formation. The silver shell is grown by reduction of silver cations onto a 14 nm gold core using ascorbic acid in colloidal aqueous solution under varying reaction concentrations producing Au@Ag nanoparticles of final sizes ranging from 51 to 78 nm in diameter. The in situ extinction spectra show a rapid increase in intensity on the timescale of 5-6 s with blue shifting and narrowing of the plasmonic peak during the silver …

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Exact Isovector Pairing In A Shell-Model Framework: Role Of Proton-Neutron Correlations In Isobaric Analog States, M. E. Miora, K. D. Launey, D. Kekejian, F. Pan, J. P. Draayer Dec 2019

Exact Isovector Pairing In A Shell-Model Framework: Role Of Proton-Neutron Correlations In Isobaric Analog States, M. E. Miora, K. D. Launey, D. Kekejian, F. Pan, J. P. Draayer

Faculty Publications

We utilize a nuclear shell model Hamiltonian with only two adjustable parameters to generate, for the first time, exact solutions for pairing correlations for light to medium-mass nuclei, including the challenging proton-neutron pairs, while also identifying the primary physics involved. In addition to single-particle energy and Coulomb potential terms, the shell model Hamiltonian consists of an isovector T=1 pairing interaction and an average proton-neutron isoscalar T=0 interaction, where the T=0 term describes the average interaction between nonpaired protons and neutrons. This Hamiltonian is exactly solvable, where, utilizing three to seven single-particle energy levels, we reproduce experimental data for 0+ state …

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Cosmogenic Neutron Production At The Sudbury Neutrino Observatory, B. Aharmim, S. N. Ahmed, A. E. Anthony, N. Barros, E. W. Beier, A. Bellerive, B. Beltran, M. Bergevin, S. D. Biller, R. Bonventre, K. Boudjemline, M. G. Boulay, B. Cai, E. J. Callaghan, J. Caravaca, Y. D. Chan, D. Chauhan, M. Chen, B. T. Cleveland, G. A. Cox, R. Curley, X. Dai, H. Deng, F. B. Descamps, J. A. Detwiler, P. J. Doe, G. Doucas, P. L. Drouin Dec 2019

Cosmogenic Neutron Production At The Sudbury Neutrino Observatory, B. Aharmim, S. N. Ahmed, A. E. Anthony, N. Barros, E. W. Beier, A. Bellerive, B. Beltran, M. Bergevin, S. D. Biller, R. Bonventre, K. Boudjemline, M. G. Boulay, B. Cai, E. J. Callaghan, J. Caravaca, Y. D. Chan, D. Chauhan, M. Chen, B. T. Cleveland, G. A. Cox, R. Curley, X. Dai, H. Deng, F. B. Descamps, J. A. Detwiler, P. J. Doe, G. Doucas, P. L. Drouin

Faculty Publications

Neutrons produced in nuclear interactions initiated by cosmic-ray muons present an irreducible background to many rare-event searches, even in detectors located deep underground. Models for the production of these neutrons have been tested against previous experimental data, but the extrapolation to deeper sites is not well understood. Here we report results from an analysis of cosmogenically produced neutrons at the Sudbury Neutrino Observatory. A specific set of observables are presented, which can be used to benchmark the validity of geant4 physics models. In addition, the cosmogenic neutron yield, in units of 10-4 cm2/(g·μ), is measured to be 7.28±0.09(stat)-1.12+1.59(syst) in pure …

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Influencing Factors On The Velocity And Temperature Of Propagating Fronts In Acrylate Composites, Samuel Morris Bynum Dec 2019

Influencing Factors On The Velocity And Temperature Of Propagating Fronts In Acrylate Composites, Samuel Morris Bynum

LSU Doctoral Dissertations

Thermal frontal polymerization is a type of polymerization in which a localized reaction zone propagates through an unstirred system. It is incumbent upon the production and transport of heat produced as a result of the exothermic reaction associated with free-radical polymerization. First discovered in the 1970s, frontal polymerization has been since utilized to produce a variety of different materials, utilizing a variety of different chemistries. The temperature of the propagating front and the velocity at which it propagates can be influenced via chemical or physical means. We show that through careful selection of monomers and control of the concentration of …

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Resource Theory Of Asymmetric Distinguishability, Xin Wang, Mark M. Wilde Dec 2019

Resource Theory Of Asymmetric Distinguishability, Xin Wang, Mark M. Wilde

Faculty Publications

This paper systematically develops the resource theory of asymmetric distinguishability, as initiated roughly a decade ago [Matsumoto, Reverse test and characterization of quantum relative entropy, arXiv:1010.1030]. The key constituents of this resource theory are quantum boxes, consisting of a pair of quantum states, which can be manipulated for free by means of an arbitrary quantum channel. We introduce bits of asymmetric distinguishability as the basic currency in this resource theory, and we prove that it is a reversible resource theory in the asymptotic limit, with the quantum relative entropy being the fundamental rate of resource interconversion. The distillable distinguishability is …

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Resource Theory Of Asymmetric Distinguishability For Quantum Channels, Xin Wang, Mark M. Wilde Dec 2019

Resource Theory Of Asymmetric Distinguishability For Quantum Channels, Xin Wang, Mark M. Wilde

Faculty Publications

This paper develops the resource theory of asymmetric distinguishability for quantum channels, generalizing the related resource theory for states [Matsumoto, arXiv:1010.1030, Wang and Wilde, Phys. Rev. Research 1, 033170 (2019)10.1103/PhysRevResearch.1.033170]. The key constituents of the channel resource theory are quantum channel boxes, consisting of a pair of quantum channels, which can be manipulated for free by means of an arbitrary quantum superchannel (the most general physical transformation of a quantum channel). One main question of the resource theory is the approximate channel box transformation problem, in which the goal is to transform an initial channel box (or boxes) to a …

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Quantum-Enhanced Advanced Ligo Detectors In The Era Of Gravitational-Wave Astronomy, M. Tse, Haocun Yu, N. Kijbunchoo, A. Fernandez-Galiana, P. Dupej, L. Barsotti, C. D. Blair, D. D. Brown, S. E. Dwyer, A. Effler, M. Evans, P. Fritschel, V. V. Frolov, A. C. Green, G. L. Mansell, F. Matichard, N. Mavalvala, D. E. Mcclelland, L. Mcculler, T. Mcrae, J. Miller, A. Mullavey, E. Oelker, I. Y. Phinney, D. Sigg, B. J.J. Slagmolen, T. Vo, R. L. Ward, C. Whittle, R. Abbott, C. Adams, R. X. Adhikari, A. Ananyeva Dec 2019

Quantum-Enhanced Advanced Ligo Detectors In The Era Of Gravitational-Wave Astronomy, M. Tse, Haocun Yu, N. Kijbunchoo, A. Fernandez-Galiana, P. Dupej, L. Barsotti, C. D. Blair, D. D. Brown, S. E. Dwyer, A. Effler, M. Evans, P. Fritschel, V. V. Frolov, A. C. Green, G. L. Mansell, F. Matichard, N. Mavalvala, D. E. Mcclelland, L. Mcculler, T. Mcrae, J. Miller, A. Mullavey, E. Oelker, I. Y. Phinney, D. Sigg, B. J.J. Slagmolen, T. Vo, R. L. Ward, C. Whittle, R. Abbott, C. Adams, R. X. Adhikari, A. Ananyeva

Faculty Publications

The Laser Interferometer Gravitational Wave Observatory (LIGO) has been directly detecting gravitational waves from compact binary mergers since 2015. We report on the first use of squeezed vacuum states in the direct measurement of gravitational waves with the Advanced LIGO H1 and L1 detectors. This achievement is the culmination of decades of research to implement squeezed states in gravitational-wave detectors. During the ongoing O3 observation run, squeezed states are improving the sensitivity of the LIGO interferometers to signals above 50 Hz by up to 3 dB, thereby increasing the expected detection rate by 40% (H1) and 50% (L1).

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Search For Gravitational Waves From Scorpius X-1 In The Second Advanced Ligo Observing Run With An Improved Hidden Markov Model, B. P. Abbott, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, C. Adams, R. X. Adhikari, V. B. Adya, C. Affeldt, M. Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, G. Allen, A. Allocca, M. A. Aloy, P. A. Altin, A. Amato, A. Ananyeva, S. B. Anderson, W. G. Anderson, S. V. Angelova, S. Antier, S. Appert, K. Arai, M. C. Araya, J. S. Areeda, M. Arène, N. Arnaud Dec 2019

Search For Gravitational Waves From Scorpius X-1 In The Second Advanced Ligo Observing Run With An Improved Hidden Markov Model, B. P. Abbott, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, C. Adams, R. X. Adhikari, V. B. Adya, C. Affeldt, M. Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, G. Allen, A. Allocca, M. A. Aloy, P. A. Altin, A. Amato, A. Ananyeva, S. B. Anderson, W. G. Anderson, S. V. Angelova, S. Antier, S. Appert, K. Arai, M. C. Araya, J. S. Areeda, M. Arène, N. Arnaud

Faculty Publications

We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO's second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h095%=3.47×10-25 when marginalizing over …

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Erratum: Measurement Of D+ Be 7 Cross Sections For Big-Bang Nucleosynthesis (Physical Review Letters (2019) 122 (182701) Doi: 10.1103/Physrevlett.122.182701), N. Rijal, I. Wiedenhöver, J. C. Blackmon, M. Anastasiou, L. T. Baby, D. D. Caussyn, P. Höflich, K. W. Kemper, E. Koshchiy, G. V. Rogachev Dec 2019

Erratum: Measurement Of D+ Be 7 Cross Sections For Big-Bang Nucleosynthesis (Physical Review Letters (2019) 122 (182701) Doi: 10.1103/Physrevlett.122.182701), N. Rijal, I. Wiedenhöver, J. C. Blackmon, M. Anastasiou, L. T. Baby, D. D. Caussyn, P. Höflich, K. W. Kemper, E. Koshchiy, G. V. Rogachev

Faculty Publications

The cross sections of nuclear reactions between the radioisotope Be7 and deuterium, a possible mechanism of reducing the production of mass-7 nuclides in big-bang nucleosynthesis, were measured at center-of-mass energies between 0.2 and 1.5 MeV. The measured cross sections are dominated by the (d,a) reaction channel, towards which prior experiments were mostly insensitive. A new resonance at 0.36(5) MeV with a strength of ωγ=1.7(5) keV was observed inside the relevant Gamow window. Calculations of nucleosynthesis outcomes based on the experimental cross section show that the resonance reduces the predicted abundance of primordial Li7, but not sufficiently to solve the primordial …

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Use Of Modified Reineke's Stand Density Index In Predicting Growth And Survival Of Chinese Fir Plantations, Xiongqing Zhang, Quang V. Cao, Lele Lu, Hanchen Wang, Aiguo Duan, Jianguo Zhang Dec 2019

Use Of Modified Reineke's Stand Density Index In Predicting Growth And Survival Of Chinese Fir Plantations, Xiongqing Zhang, Quang V. Cao, Lele Lu, Hanchen Wang, Aiguo Duan, Jianguo Zhang

Faculty Publications

Stand density index (SDI) has played an important role in controlling stand stocking and modeling stand development in forest stands. Reineke's SDI (SDI-R) is based on a constant slope of -1.605 for the self-thinning line. For Chinese fir plantations, however, it has been reported that the self-thinning slope varied with site and climate, rendering SDI-R questionable. Remeasured data from 48 plots distributed in Fujian, Jiangxi, Guangxi, and Sichuan provinces were used to develop models for prediction of stand survival and basal area, with SDI-R incorporated as a predictor variable. Also included in the evaluation were growth models based on self-thinning …

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Development And Evaluation Of A One-Step Multiplex Real-Time Taqman® Rt-Qpcr Assay For The Detection And Genotyping Of Equine G3 And G14 Rotaviruses In Fecal Samples, Mariano Carossino, Maria E. Barrandeguy, Erdal Erol, Yanqiu Li, Udeni B. R. Balasuriya Dec 2019

Development And Evaluation Of A One-Step Multiplex Real-Time Taqman® Rt-Qpcr Assay For The Detection And Genotyping Of Equine G3 And G14 Rotaviruses In Fecal Samples, Mariano Carossino, Maria E. Barrandeguy, Erdal Erol, Yanqiu Li, Udeni B. R. Balasuriya

Faculty Publications

No abstract provided.

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Understanding Tidal Marsh Trajectories: Evaluation Of Multiple Indicators Of Marsh Persistence, Kerstin Wasson, Neil K. Ganju, Zafer Defne, Charlie Endris, Tracy Elsey-Quirk, Karen M. Thorne, Chase M. Freeman, Glenn Guntenspergen, Daniel J. Nowacki, Kenneth B. Raposa Dec 2019

Understanding Tidal Marsh Trajectories: Evaluation Of Multiple Indicators Of Marsh Persistence, Kerstin Wasson, Neil K. Ganju, Zafer Defne, Charlie Endris, Tracy Elsey-Quirk, Karen M. Thorne, Chase M. Freeman, Glenn Guntenspergen, Daniel J. Nowacki, Kenneth B. Raposa

Faculty Publications

No abstract provided.

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Population Connectivity Of Pelagic Megafauna In The Cuba-Mexico-United States Triangle, Jay R. Rooker, Michael A. Dance, R. J.David Wells, Matthew J. Ajemian, Barbara A. Block, Michael R. Castleton, J. Marcus Drymon, Brett J. Falterman, James S. Franks, Neil Hammerschlag, Jill M. Hendon, Eric R. Hoffmayer, Richard T. Kraus, Jennifer A. Mckinney, David H. Secor, Gregory W. Stunz, John F. Walter Dec 2019

Population Connectivity Of Pelagic Megafauna In The Cuba-Mexico-United States Triangle, Jay R. Rooker, Michael A. Dance, R. J.David Wells, Matthew J. Ajemian, Barbara A. Block, Michael R. Castleton, J. Marcus Drymon, Brett J. Falterman, James S. Franks, Neil Hammerschlag, Jill M. Hendon, Eric R. Hoffmayer, Richard T. Kraus, Jennifer A. Mckinney, David H. Secor, Gregory W. Stunz, John F. Walter

Faculty Publications

The timing and extent of international crossings by billfishes, tunas, and sharks in the Cuba-Mexico-United States (U.S.) triangle was investigated using electronic tagging data from eight species that resulted in >22,000 tracking days. Transnational movements of these highly mobile marine predators were pronounced with varying levels of bi- or tri-national population connectivity displayed by each species. Billfishes and tunas moved throughout the Gulf of Mexico and all species investigated (blue marlin, white marlin, Atlantic bluefin tuna, yellowfin tuna) frequently crossed international boundaries and entered the territorial waters of Cuba and/or Mexico. Certain sharks (tiger shark, scalloped hammerhead) displayed prolonged periods …

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In Vivo Imaging Of D2 Receptors And Corticosteroids Predict Behavioural Responses To Captivity Stress In A Wild Bird, Christine R. Lattin, Devin P. Merullo, Lauren V. Riters, Richard E. Carson Dec 2019

In Vivo Imaging Of D2 Receptors And Corticosteroids Predict Behavioural Responses To Captivity Stress In A Wild Bird, Christine R. Lattin, Devin P. Merullo, Lauren V. Riters, Richard E. Carson

Faculty Publications

© 2019, The Author(s). Individual physiological variation may underlie individual differences in behaviour in response to stressors. This study tested the hypothesis that individual variation in dopamine and corticosteroid physiology in wild house sparrows (Passer domesticus, n = 15) would significantly predict behaviour and weight loss in response to a long-term stressor, captivity. We found that individuals that coped better with captivity (fewer anxiety-related behaviours, more time spent feeding, higher body mass) had lower baseline and higher stress-induced corticosteroid titres at capture. Birds with higher striatal D2 receptor binding (examined using positron emission tomography (PET) with 11C-raclopride 24 h post-capture) …

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Do Global Regulators Hold The Key To Production Of Bacterial Secondary Metabolites?, Sudarshan Singh Thapa, Anne Grove Dec 2019

Do Global Regulators Hold The Key To Production Of Bacterial Secondary Metabolites?, Sudarshan Singh Thapa, Anne Grove

Faculty Publications

© 2019 by the authors. Licensee MDPI, Basel, Switzerland. The emergence of multiple antibiotic resistant bacteria has pushed the available pool of antibiotics to the brink. Bacterial secondary metabolites have long been a valuable resource in the development of antibiotics, and the genus Burkholderia has recently emerged as a source of novel compounds with antibacterial, antifungal, and anti-cancer activities. Genome mining has contributed to the identification of biosynthetic gene clusters, which encode enzymes that are responsible for synthesis of such secondary metabolites. Unfortunately, these large gene clusters generally remain silent or cryptic under normal laboratory settings, which creates a hurdle …

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Evolution Patterns Of Peg3 And H19-Icr, Joomyeong Kim Dec 2019

Evolution Patterns Of Peg3 And H19-Icr, Joomyeong Kim

Faculty Publications

© 2018 Elsevier Inc. Mammalian imprinted domains are regulated through small genomic regions termed Imprinting Control Regions (ICRs). In the current study, the evolution patterns of the ICRs of Peg3 and H19-imprinted domains were analyzed using the genomic sequences derived from a large number of mammals. The results indicated that multiple YY1 and CTCF binding sites are localized within the Peg3 and H19-ICR in all the mammals tested. The numbers of YY1 and CTCF binding sites are variable among individual species, yet positively correlate with the presence of tandem repeats within the Peg3 and H19-ICRs. Thus, multiple YY1 and CTCF …

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Local Adaptation Of A Dominant Coastal Tree To Freshwater Availability And Solar Radiation Suggested By Genomic And Ecophysiological Approaches, Mariana Vargas Cruz, Gustavo Maruyama Mori, Caroline Signori-Müller, Carla Cristina Da Silva, Dong Ha Oh, Maheshi Dassanayake, Maria Imaculada Zucchi, Rafael Silva Oliveira, Anete Pereira De Souza Dec 2019

Local Adaptation Of A Dominant Coastal Tree To Freshwater Availability And Solar Radiation Suggested By Genomic And Ecophysiological Approaches, Mariana Vargas Cruz, Gustavo Maruyama Mori, Caroline Signori-Müller, Carla Cristina Da Silva, Dong Ha Oh, Maheshi Dassanayake, Maria Imaculada Zucchi, Rafael Silva Oliveira, Anete Pereira De Souza

Faculty Publications

© 2019, The Author(s). Local adaptation is often a product of environmental variations in geographical space and has implications for biodiversity conservation. We investigated the role of latitudinal heterogeneity in climate on the organization of genetic and phenotypic variation in the dominant coastal tree Avicennia schaueriana. In a common garden experiment, samples from an equatorial region, with pronounced seasonality in precipitation, accumulated less biomass, and showed lower stomatal conductance and transpiration, narrower xylem vessels, smaller leaves and higher reflectance of long wavelengths by the stem epidermis than samples from a subtropical region, with seasonality in temperature and no dry season. …

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Combinatorial Delivery Of Mirna-Nanoparticle Conjugates In Human Adipose Stem Cells For Amplified Osteogenesis, Mohammad Abu-Laban, Prakash Hamal, Julien H. Arrizabalaga, Anoosha Forghani, Asela S. Dikkumbura, Raju R. Kumal, Louis H. Haber, Daniel J. Hayes Dec 2019

Combinatorial Delivery Of Mirna-Nanoparticle Conjugates In Human Adipose Stem Cells For Amplified Osteogenesis, Mohammad Abu-Laban, Prakash Hamal, Julien H. Arrizabalaga, Anoosha Forghani, Asela S. Dikkumbura, Raju R. Kumal, Louis H. Haber, Daniel J. Hayes

Faculty Publications

© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim It is becoming more apparent in tissue engineering applications that fine temporal control of multiple therapeutics is desirable to modulate progenitor cell fate and function. Herein, the independent temporal control of the co-delivery of miR-148b and miR-21 mimic plasmonic nanoparticle conjugates to induce osteogenic differentiation of human adipose stem cells (hASCs), in a de novo fashion, is described. By applying a thermally labile retro-Diels–Alder caging and linkage chemistry, these miRNAs can be triggered to de-cage serially with discrete control of activation times. The method relies on illumination of the nanoparticles at …

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Efficacy Of Reduced Rates Of Chlorantraniliprole Seed Treatment On Insect Pests Of Irrigated Drill-Seeded Rice, James M. Villegas, Blake E. Wilson, Michael J. Stout Dec 2019

Efficacy Of Reduced Rates Of Chlorantraniliprole Seed Treatment On Insect Pests Of Irrigated Drill-Seeded Rice, James M. Villegas, Blake E. Wilson, Michael J. Stout

Faculty Publications

© 2019 Society of Chemical Industry Background: For the past decade, insecticidal seed treatment has been the most widely used control tactic against insect pests of rice (Oryza sativa L.) in the USA. Seed treatments are used primarily to control the most economically important early-season pest of rice, the rice water weevil (Lissorhoptrus oryzophilus Kuschel). This study was conducted to evaluate the efficacy of reduced rates of chlorantraniliprole seed treatment against the rice water weevil, fall armyworm (Spodoptera frugiperda J.E. Smith), and sugarcane borer (Diatraea saccharalis F.) under field and laboratory conditions. Concentrations of chlorantraniliprole in plant tissues were determined …

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Plant-Mediated Interactions Among Above-Ground And Below-Ground Life Stages Of A Root-Feeding Weevil, Emily C. Kraus, Michael J. Stout Dec 2019

Plant-Mediated Interactions Among Above-Ground And Below-Ground Life Stages Of A Root-Feeding Weevil, Emily C. Kraus, Michael J. Stout

Faculty Publications

© 2019 The Royal Entomological Society 1. Interactions among herbivores mediated by plant responses to herbivore injury may have large impacts on herbivore population densities. Responses may persist for weeks after injury and may affect not only the initial (inducing) herbivore, but also herbivores that are spatially or temporally separated from the initial attacker. 2. In many plant–insect interactions, multiple life stages of the insect may be associated with the same plant, and these various stages may interact indirectly with one another via induced responses. The rice water weevil (RWW), Lissorhoptrus oryzophilus, a serious global pest of rice, is one …

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Effects Of Arbuscular Mycorrhizal Fungi On Rice-Herbivore Interactions Are Soil-Dependent, Lina Bernaola, Michael J. Stout Dec 2019

Effects Of Arbuscular Mycorrhizal Fungi On Rice-Herbivore Interactions Are Soil-Dependent, Lina Bernaola, Michael J. Stout

Faculty Publications

© 2019, The Author(s). The effect of soil type on establishment of arbuscular mycorrhizal (AM) fungi, and their effects on plant growth and resistance to rice pests are poorly understood. We investigated the effects of inoculation with AM fungi on rice plants in two different unsterilized field soils under greenhouse and field conditions in two consecutive years in Louisiana, United States. We tested whether inoculation with AM fungi in the two soils changed plant biomass, nutrient concentration, resistance to pests, and yields. Inoculation with a commercial formulation of AM fungi increased root colonization by fungi in all soils, regardless of …

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Direct And Indirect Effects Of Herbicides On Insect Herbivores In Rice, Oryza Sativa, Emily C. Kraus, Michael J. Stout Dec 2019

Direct And Indirect Effects Of Herbicides On Insect Herbivores In Rice, Oryza Sativa, Emily C. Kraus, Michael J. Stout

Faculty Publications

© 2019, The Author(s). Densities of insect pests in agricultural communities may be affected by herbicides commonly used for weed management via several routes. First, herbicides may cause direct mortality to insects present both during and immediately following application. Second, herbicides may induce plant defenses that increase resistance to insect herbivores. Third, herbicides may alter the quantity and composition of weed populations, which in turn may change the structure of insect communities found subsequently in the crop. This study was designed to investigate the effects of an array of herbicides on the densities of several major pests found in rice …

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