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Biology And Management Of The Forest Tent Caterpillar (Lepidoptera: Lasiocampidae), Timothy D. Schowalter Jan 2017

Biology And Management Of The Forest Tent Caterpillar (Lepidoptera: Lasiocampidae), Timothy D. Schowalter

Faculty Publications

The forest tent caterpillar, Malacosoma disstria Hübner (Lepidoptera: Lasiocampidae) is a widespread defoliator that is native throughout most of the continental United States and Canada south of 61°N latitude. Larvae feed on a wide variety of hosts across their geographic range, but local populations perform best on local host species. Defoliation during outbreaks can strip preferred trees of all foliage and cause substantial branch mortality and growth reduction but generally does not cause much tree mortality, at least not directly. Defoliation in recreational areas reduces visitation because migrating caterpillars are viewed as nuisances and defoliated trees as unsightly. The insects, …

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Biology And Management Of The Fall Webworm, Hyphantria Cunea (Lepidoptera: Erebidae), T. D. Schowalter, D. R. Ring Jan 2017

Biology And Management Of The Fall Webworm, Hyphantria Cunea (Lepidoptera: Erebidae), T. D. Schowalter, D. R. Ring

Faculty Publications

The fall webworm, Hyphantria cunea (Drury) (Lepidoptera: Erebidae), is a widespread defoliator that is native throughout the continental United States, as well as southern Canada and northern Mexico. It has been introduced accidentally into many parts of Europe and Asia. Larvae have been recorded from > 400 species of forest and shade trees, primarily hardwoods, but also several conifer species in the southern United States. This species is of minor importance in forests, but can cause serious losses in pecan and fruit tree orchards and is a major nuisance in urban parks and homelots where it often completely defoliates ornamental and …

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Genome-Wide Meta-Analysis Of 241,258 Adults Accounting For Smoking Behaviour Identifies Novel Loci For Obesity Traits, Anne E. Justice, Thomas W. Winkler, Mary F. Feitosa, Misa Graff, Virginia A. Fisher, Kristin Young, Llilda Barata, Xuan Deng, Jacek Czajkowski, David Hadley, Julius S. Ngwa, Tarunveer S. Ahluwalia, Audrey Y. Chu, Nancy L. Heard-Costa, Elise Lim, Jeremiah Perez, John D. Eicher, Zolta'n Kutalik, Luting Xue, Anubha Mahajan, Frida Renström, Joseph Wu, Qibin Qi, Shafqat Ahmad, Tamuno Alfred, Najaf Amin, Lawrence F. Bielak, Amelie Bonnefond, Jennifer Bragg, Gemma Cadby, Martina Chittani, Scott Coggeshall, Tanguy Corre Jan 2017

Genome-Wide Meta-Analysis Of 241,258 Adults Accounting For Smoking Behaviour Identifies Novel Loci For Obesity Traits, Anne E. Justice, Thomas W. Winkler, Mary F. Feitosa, Misa Graff, Virginia A. Fisher, Kristin Young, Llilda Barata, Xuan Deng, Jacek Czajkowski, David Hadley, Julius S. Ngwa, Tarunveer S. Ahluwalia, Audrey Y. Chu, Nancy L. Heard-Costa, Elise Lim, Jeremiah Perez, John D. Eicher, Zolta'n Kutalik, Luting Xue, Anubha Mahajan, Frida Renström, Joseph Wu, Qibin Qi, Shafqat Ahmad, Tamuno Alfred, Najaf Amin, Lawrence F. Bielak, Amelie Bonnefond, Jennifer Bragg, Gemma Cadby, Martina Chittani, Scott Coggeshall, Tanguy Corre

Faculty Publications

Few genome-wide association studies (GWAS) account for environmental exposures, like smoking, potentially impacting the overall trait variance when investigating the genetic contribution to obesity-related traits. Here, we use GWAS data from 51,080 current smokers and 190,178 nonsmokers (87% European descent) to identify loci influencing BMI and central adiposity, measured as waist circumference and waist-to-hip ratio both adjusted for BMI. We identify 23 novel genetic loci, and 9 loci with convincing evidence of gene-smoking interaction (GxSMK) on obesity-related traits. We show consistent direction of effect for all identified loci and significance for 18 novel and for 5 interaction loci in an …

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Microsatellite Markers Reveal A Predominant Sugarcane Aphid (Homoptera: Aphididae) Clone Is Found On Sorghum In Seven States And One Territory Of The Usa, Karen Harris-Shultz, Xinzhi Ni, Phillip A. Wadl, Xinwang Wang, Hongliang Wang, Fangneng Huang, Kathy Flanders, Nicholas Seiter, David Kerns, Robert Meagher, Qingwu Xue, Dominic Reisig, David Buntin, Hugo E. Cuevas, Michael J. Brewer, Xiangbing Yang Jan 2017

Microsatellite Markers Reveal A Predominant Sugarcane Aphid (Homoptera: Aphididae) Clone Is Found On Sorghum In Seven States And One Territory Of The Usa, Karen Harris-Shultz, Xinzhi Ni, Phillip A. Wadl, Xinwang Wang, Hongliang Wang, Fangneng Huang, Kathy Flanders, Nicholas Seiter, David Kerns, Robert Meagher, Qingwu Xue, Dominic Reisig, David Buntin, Hugo E. Cuevas, Michael J. Brewer, Xiangbing Yang

Faculty Publications

The sugarcane aphid (Melanaphis sacchari) has become a serious pest causing severe economic losses to sorghum [Sorghum bicolor (L.) Moench] grown in the southern United States. Since its original detection in four states in 2013, M. sacchari on sorghum has now, in 2016, spread to 19 states. The presence of one or multiple genotypes on sorghum in the United States has not yet been established. In this study, genome sequencing of M. sacchari was used to develop microsatellite markers. A total of 8,665,267 reads and 1.44 Gb of nucleotide sequences were generated, and 79.6% of the reads were from M. …

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Objectively Measuring Subjectively Described Traits: Geographic Variation In Body Shape And Caudal Coloration Pattern Within Vieja Melanura (Teleostei: Cichlidae), Caleb D. Mcmahan, Justin Kutz, Christopher M. Murray, Prosanta Chakrabarty, Aaron D. Geheber, Diego Elías Jan 2017

Objectively Measuring Subjectively Described Traits: Geographic Variation In Body Shape And Caudal Coloration Pattern Within Vieja Melanura (Teleostei: Cichlidae), Caleb D. Mcmahan, Justin Kutz, Christopher M. Murray, Prosanta Chakrabarty, Aaron D. Geheber, Diego Elías

Faculty Publications

© 2017, Universidad de Costa Rica. All rights reserved. Vieja melanura is a Neotropical cichlid occurring in the Petén-lake district systems of Guatemala, as well as the Río Grijalva-Usumacinta basin, and other systems in Southern México, Belize, and Guatemala. A caudal stripe, extending forward from the caudal peduncle, is characteristic of this species. This stripe is sloped downward in nearly all individuals of V. melanura, but the degree of the slope is highly variable throughout its range. The slope and shape of the stripe has previously been used in diagnosing and differentiating between species of Vieja. The purpose of this …

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Biomarkers Of Aryl-Hydrocarbon Receptor Activity In Gulf Killifish (Fundulus Grandis) From Northern Gulf Of Mexico Marshes Following The Deepwater Horizon Oil Spill, Benjamin Dubansky, Charles D. Rice, Lester F. Barrois, Fernando Galvez Jan 2017

Biomarkers Of Aryl-Hydrocarbon Receptor Activity In Gulf Killifish (Fundulus Grandis) From Northern Gulf Of Mexico Marshes Following The Deepwater Horizon Oil Spill, Benjamin Dubansky, Charles D. Rice, Lester F. Barrois, Fernando Galvez

Faculty Publications

© 2017, Springer Science+Business Media New York. Following the Deepwater Horizon oil spill, shorelines throughout the Barataria Basin of the northern Gulf of Mexico in Louisiana were heavily oiled for months with Macondo-252 oil, potentially impacting estuarine species. The Gulf killifish (Fundulus grandis) has been identified as a sentinel species for the study of site-specific effects of crude oil contamination on biological function. In November and December 2010, 4–5 months after the Macondo well was plugged and new oil was no longer spilling into the Gulf waters, Gulf killifish were collected across the Barataria Basin from 14 sites with varying …

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A Multiple Case Narrative Examining The Experiences Of Alumni Of A Minority Research And Training Program, Gretchen Burton Jan 2017

A Multiple Case Narrative Examining The Experiences Of Alumni Of A Minority Research And Training Program, Gretchen Burton

Faculty Publications

The implementation of minority research and training (MRT) programs at the post secondary level has risen to close the educational achievement gap and build undergraduate pathways to generate a highly skilled and diverse STEM pool. Although the numbers of advanced science related degrees have slowly increased over the past decade, partially due to the utilization of MRT programs, this increase has not been adequate to establish an impactful representation in either academic or industry research careers. Numerous studies identify various support interventions influencing positive outcomes among MRT participants achieving graduate degrees. However, majority of the studies utilize quantitative or a …

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[Review Of] Robert J. Richards And Michael Ruse, Debating Darwin, Charles H. Pence Jan 2017

[Review Of] Robert J. Richards And Michael Ruse, Debating Darwin, Charles H. Pence

Faculty Publications

No abstract provided.

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Posterior Estimates Of Dynamic Constants In Hiv Transmission Modeling, Yingqing Chen, Renee Dale, Hongyu He, Quoc Anh T. Le Jan 2017

Posterior Estimates Of Dynamic Constants In Hiv Transmission Modeling, Yingqing Chen, Renee Dale, Hongyu He, Quoc Anh T. Le

Faculty Publications

In this paper, we construct a linear differential system in both continuous time and discrete time to model HIV transmission on the population level. The main question is the determination of parameters based on the posterior information obtained from statistical analysis of the HIV population. We call these parameters dynamic constants in the sense that these constants determine the behavior of the system in various models. There is a long history of using linear or nonlinear dynamic systems to study the HIV population dynamics or other infectious diseases. Nevertheless, the question of determining the dynamic constants in the system has …

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Pbwt: Achieving Succinct Data Structures For Parameterized Pattern Matching And Related Problems, Arnab Ganguly, Rahul Shah, Sharma V. Thankachan Jan 2017

Pbwt: Achieving Succinct Data Structures For Parameterized Pattern Matching And Related Problems, Arnab Ganguly, Rahul Shah, Sharma V. Thankachan

Faculty Publications

The fields of succinct data structures and compressed text indexing have seen quite a bit of progress over the last two decades. An important achievement, primarily using techniques based on the Burrows-Wheeler Transform (BWT), was obtaining the full functionality of the suffix tree in the optimal number of bits. A crucial property that allows the use of BWT for designing compressed indexes is order-preserving suffix links. Specifically, the relative order between two suffixes in the subtree of an internal node is same as that of the suffixes obtained by truncating the furst character of the two suffixes. Unfortunately, in many …

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The Microbiome Of Neotropical Ticks Parasitizing On Passerine Migratory Birds, Khemraj Budachetri, Jaclyn Williams, Nabanita Mukherjee, Michael Sellers, Shahid Karim Jan 2017

The Microbiome Of Neotropical Ticks Parasitizing On Passerine Migratory Birds, Khemraj Budachetri, Jaclyn Williams, Nabanita Mukherjee, Michael Sellers, Shahid Karim

Faculty Publications

Seasonal migration of passerine birds between temperate North America and tropical Central and South America is an ecological phenomenon. Migration of birds has been associated with the introduction of ectoparasites like ticks or tick-borne pathogens across the avian migration routes. In this study, the microbial diversity was determined in the ticks and bird DNA samples using 454 pyrosequencing of bacterial 16S rRNA gene. Tick DNA samples showed the dominance of genera Lactococcus, Francisella, Raoultella, Wolbachiaand Rickettsia across all the ticks, but birds DNA did not share common microbial diversity with ticks. Furthermore, “Candidatus Rickettsia amblyommii” …

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Eco-Health Linkages: Assessing The Role Of Ecosystem Goods And Services On Human Health Using Causal Criteria Analysis, Rebeca De Jesus Crespo, Richard Fulford Jan 2017

Eco-Health Linkages: Assessing The Role Of Ecosystem Goods And Services On Human Health Using Causal Criteria Analysis, Rebeca De Jesus Crespo, Richard Fulford

Faculty Publications

No abstract provided.

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Tropical Maize Selection Indexes Genotypes For Efficiency In Use Of Nutrients: Phosphorus, Gabriel Gonçalves Dos Reis, Felipe Bermudez Pereira, Italo Stefanine Correia Granato, Júlio César Dovale, Roberto Fritsche-Neto Jan 2017

Tropical Maize Selection Indexes Genotypes For Efficiency In Use Of Nutrients: Phosphorus, Gabriel Gonçalves Dos Reis, Felipe Bermudez Pereira, Italo Stefanine Correia Granato, Júlio César Dovale, Roberto Fritsche-Neto

Faculty Publications

Brazil generates an annual demand for more than 2.83 million tons of phosphate fertilizers. Part of this is due to low P use efficiency (PUE) by plants, particularly in current maize cultivars. Thus, the aim of this study was to create indexes that allow accurate selection of maize genotypes with high PUE under conditions of either low or high P availability. The experiment was conducted in a greenhouse (20°45'14"S; 42°52'53"W) at the Universidade Federal de Viçosa in October 2010. We evaluated 39 experimental hybrid combinations and 14 maize inbred lines with divergent PUE under two conditions of P availability. The …

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An Integrated System For Modeling Tree And Stand Survival, Quang V. Cao Jan 2017

An Integrated System For Modeling Tree And Stand Survival, Quang V. Cao

Faculty Publications

Traditionally, separate models have been used to predict the number of trees per unit area (stand-level survival) and the survival probability of an individual tree (tree-level survival) at a certain age. This study investigated the development of integrated systems in which survival models at different levels of resolution are related in a mathematical structure. Two approaches for modeling tree and stand survival were considered: deriving a stand-level survival model from a tree-level survival model (approach 1) and deriving a tree survival model from a stand survival model (approach 2). Both approaches rely on finding a tree diameter that yields a …

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Modeling Tree Mortality In Relation To Climate, Initial Planting Density, And Competition In Chinese Fir Plantations Using A Bayesian Logistic Multilevel Method, Xiongqing Zhang, Quang V. Cao, Aiguo Duan, Jianguo Zhang Jan 2017

Modeling Tree Mortality In Relation To Climate, Initial Planting Density, And Competition In Chinese Fir Plantations Using A Bayesian Logistic Multilevel Method, Xiongqing Zhang, Quang V. Cao, Aiguo Duan, Jianguo Zhang

Faculty Publications

Tree mortality models are important tools for simulating forest dynamic processes, and logistic regression is widely used for modeling tree mortality. However, most of the mortality models that have been developed generally ignore the hierarchical structure. In this study, Bayesian logistic multilevel mortality models were developed with the independent variables of initial planting density, competition, site index, and climate factors in Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) plantations in southern China. The results showed that a Bayesian three-level model was best for describing tree mortality data with multiple sources of unobserved heterogeneity compared to fixed-effects and two-level models. The variance …

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Effect Of Fungicide Applications On Grain Sorghum (Sorghum Bicolor L.) Growth And Yield, Dan D. Fromme, Trey Price, Josh Lofton, Tom Isakeit, Ronnie Schnell, Syam Dodla, Daniel Stephenson, W. James Grichar, Keith Shannon Jan 2017

Effect Of Fungicide Applications On Grain Sorghum (Sorghum Bicolor L.) Growth And Yield, Dan D. Fromme, Trey Price, Josh Lofton, Tom Isakeit, Ronnie Schnell, Syam Dodla, Daniel Stephenson, W. James Grichar, Keith Shannon

Faculty Publications

Field studies were conducted in the upper Texas Gulf Coast and in central Louisiana during the 2013 through 2015 growing seasons to evaluate the effects of fungicides on grain sorghum growth and development when disease pressure was low or nonexistent. Azoxystrobin and flutriafol at 1.0 L/ha and pyraclostrobin at 0.78 L/ha were applied to the plants of two grain sorghum hybrids (DKS 54-00, DKS 53-67) at 25% bloom and compared with the nontreated check for leaf chlorophyll content, leaf temperature, and plant lodging during the growing season as well as grain mold, test weight, yield, and nitrogen and protein content …

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A Before–After Control–Impact Assessment To Understand The Potential Impacts Of Highway Construction Noise And Activity On An Endangered Songbird, Ashley M. Long, Melanie R. Colón, Jessica L. Bosman, Dianne H. Robinson, Hannah L. Pruett, Tiffany M. Mcfarland, Heather A. Mathewson, Joseph M. Szewczak, J. Cal Newnam, Michael L. Morrison Jan 2017

A Before–After Control–Impact Assessment To Understand The Potential Impacts Of Highway Construction Noise And Activity On An Endangered Songbird, Ashley M. Long, Melanie R. Colón, Jessica L. Bosman, Dianne H. Robinson, Hannah L. Pruett, Tiffany M. Mcfarland, Heather A. Mathewson, Joseph M. Szewczak, J. Cal Newnam, Michael L. Morrison

Faculty Publications

Anthropogenic noise associated with highway construction and operation can have individual- and population-level consequences for wildlife (e.g., reduced densities, decreased reproductive success, behavioral changes). We used a before–after control–impact study design to examine the potential impacts of highway construction and traffic noise on endangered golden-cheeked warblers (Setophaga chrysoparia; hereafter warbler) in urban Texas. We mapped and monitored warbler territories before (2009–2011), during (2012–2013), and after (2014) highway construction at three study sites: a treatment site exposed to highway construction and traffic noise, a control site exposed only to traffic noise, and a second control site exposed to neither highway construction …

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Development Of An Artificial Neural Network Model To Predict Subgrade Resilient Modulus From Continuous Deflection Testing, Omar Elbagalati, Mostafa A. Elseifi, Kevin Gaspard, Zhongjie Zhang Jan 2017

Development Of An Artificial Neural Network Model To Predict Subgrade Resilient Modulus From Continuous Deflection Testing, Omar Elbagalati, Mostafa A. Elseifi, Kevin Gaspard, Zhongjie Zhang

Faculty Publications

The subgrade resilient modulus is an important parameter in pavement analysis and design. However, available non-destructive testing devices such as the falling weight deflectometer (FWD) have limitations that prevent their widespread use at the network level. This study describes the development of a model that utilizes the rolling wheel deflectometer (RWD) measurements to predict the subgrade resilient modulus at the network level for flexible pavements. Measurements ofRWDand FWD obtained from a testing program conducted in Louisiana were used to train an artificial neural network (ANN) based model. The ANN model was validated using data from a testing program independently conducted …

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Understanding The Uterine Environment In Early Pregnancy In Cattle: How Have The Omics Enhanced Our Knowledge?, Constantine A. Simintiras, Niamh Forde Jan 2017

Understanding The Uterine Environment In Early Pregnancy In Cattle: How Have The Omics Enhanced Our Knowledge?, Constantine A. Simintiras, Niamh Forde

Faculty Publications

Early pregnancy loss in cattle can be attributed to a myriad of sources. One key factor that can influence early pregnancy success or loss is the influence and interactions between the maternal environment and the developing embryo/conceptus. Recent advances in high-throughput 'omics' technologies coupled with improved bioinformatics capabilities represent a promising avenue for enhancing our understanding of fundamental developmental events - which would have direct agricultural, veterinary, and economic benefits. Thusly this review revolves around recent applications of advanced transcriptomic, proteomic, and metabolomic analyses within a bovine uterine secretomic and interactomic context, with an overriding aim to highlight the advantages …

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Modelling Aspects Of Oviduct Fluid Formation In Vitro, Constantine A. Simintiras, Thomas Fröhlich, Thozhukat Sathyapalan, Georg J. Arnold, Susanne E. Ulbrich, Henry J. Leese, Roger G. Sturmey Jan 2017

Modelling Aspects Of Oviduct Fluid Formation In Vitro, Constantine A. Simintiras, Thomas Fröhlich, Thozhukat Sathyapalan, Georg J. Arnold, Susanne E. Ulbrich, Henry J. Leese, Roger G. Sturmey

Faculty Publications

Oviduct fluid is the microenvironment that supports early reproductive processes including fertilisation, embryo cleavage and genome activation. However, the composition and regulation of this critical environment remain rather poorly defined. This study uses an in vitro preparation of the bovine oviduct epithelium to investigate the formation and composition of in vitro-derived oviduct fluid (ivDOF) within a controlled environment. We confirm the presence of oviduct-specific glycoprotein 1 in ivDOF and show that the amino acid and carbohydrate content resembles that of previously reported in vivo data. In parallel, using a different culture system, a panel of oviduct epithelial solute carrier genes …

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Dual Roles Of Oxidative Stress In Metal Carcinogenesis, Jie Xu, James T.F. Wise, Lei Wang, Kortney Schumann, Zhuo Zhang, Xianglin Shi Jan 2017

Dual Roles Of Oxidative Stress In Metal Carcinogenesis, Jie Xu, James T.F. Wise, Lei Wang, Kortney Schumann, Zhuo Zhang, Xianglin Shi

Faculty Publications

It has been well established that environmental and occupational exposure to heavy metal causes cancer in several organs. Although the exact mechanism of heavy metal carcinogenesis remains elusive, metal-generated reactive oxygen species (ROS) are essential. ROS can play two roles in metal carcinogenesis; two stages in the process of metal carcinogenesis differ in the amounts of ROS activating a dual redox-mediated mechanism. In the early stage of metal carcinogenesis, ROS acts in an oncogenic role. However, in the late stage of metal carcinogenesis, ROS plays an antioncogenic role. Similarly, NF-E2–related factor 2 (Nrf2) also has two different roles, which makes …

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Nutrients And Phytoplankton In A Shallow, Hypereutrophic Urban Lake: Prospects For Restoration, Brianne Norris, Edward A. Laws Jan 2017

Nutrients And Phytoplankton In A Shallow, Hypereutrophic Urban Lake: Prospects For Restoration, Brianne Norris, Edward A. Laws

Faculty Publications

University Lake, a shallow, artificial, urban lake adjacent to the campus of Louisiana State University, has a long history of water quality problems, including algal blooms, fish kills, and high concentrations of fecal indicator bacteria. Periodic dredging of the lake is necessary to prevent its return to swampland. This study was undertaken to elucidate the roles of allochthonous versus autochthonous nutrients as causes of water quality problems in the lake, with the expectation that this information would help identify strategies for lake restoration. Photosynthetic rates and concentrations of inorganic nutrients and phytoplankton pigments were measured over a period of one …

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A New Species Of Shrew (Soricomorpha: Crocidura) From Java, Indonesia: Possible Character Displacement Despite Interspecific Gene Flow, Terrence C. Demos, Anang S. Achmadi, Heru Handika, Maharadatunkamsi, Kevin C. Rowe, Jacob A. Esselstyn Jan 2017

A New Species Of Shrew (Soricomorpha: Crocidura) From Java, Indonesia: Possible Character Displacement Despite Interspecific Gene Flow, Terrence C. Demos, Anang S. Achmadi, Heru Handika, Maharadatunkamsi, Kevin C. Rowe, Jacob A. Esselstyn

Faculty Publications

We describe a new species of shrew (Soricomorpha, Soricidae, Crocidura) from Mt. Gede, West Java, Indonesia. Relative to other Javan shrews, the new species is small with a relatively thick, dark brown, medium-length tail. The new species is known only from the type locality at 1,611 and 1,950 m elevation on Mt. Gede. It occurs syntopically with at least 3 other Crocidura species: C. orientalis, C. abscondita, and C. monticola. Phylogenetically, the new species is nested among sympatric and allopatric populations of C. monticola. Although topological inferences differ slightly between the mtDNA gene tree and multilocus species tree, the new …

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Reverse Passing, Khaled A. Beydoun, Erika K. Wilson Jan 2017

Reverse Passing, Khaled A. Beydoun, Erika K. Wilson

Faculty Publications

No abstract provided.

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Valuing Identity, Osamudia James Jan 2017

Valuing Identity, Osamudia James

Faculty Publications

No abstract provided.

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Black Death Bodies, Sharon Dewitte, Maryanne Kowaleski Jan 2017

Black Death Bodies, Sharon Dewitte, Maryanne Kowaleski

Faculty Publications

The fourteenth-century Black Death was one of the most important and devastating epidemics in human history. It caused or accelerated important demographic, economic, political, and social changes throughout the Old World and has therefore been the subject of scholarly research in a variety of fields, including history, anthropology, demography, and molecular biology. In this paper, we examine the Black Death (specifically, the first and second outbreaks of fourteenth-century plague, c. 1347–1351 and 1361–1362) from bioarchaeological and historical perspectives, focusing on attempts to reconstruct mortality patterns and addressing the questions: Who died in England during the Black Death? How did they …

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Reproductive Strategy Of The Giant Electric Ray In The Southern Gulf Of California, María I. Burgos-Vázquez, Paola A. Mejía-Falla, Victor H. Cruz-Escalona, Nancy Brown-Peterson Jan 2017

Reproductive Strategy Of The Giant Electric Ray In The Southern Gulf Of California, María I. Burgos-Vázquez, Paola A. Mejía-Falla, Victor H. Cruz-Escalona, Nancy Brown-Peterson

Faculty Publications

The objective of the present study was to describe and characterize macroscopic and microscopic aspects of the reproductive biology of the Giant Electric Ray Narcine entemedor, a viviparous elasmobranch targeted by commercial fishers in Mexico. A total of 305 individual rays were captured (260 females, 45 males); all males were sexually mature. The median size at maturity for females was estimated to be 58.5 cm TL, the median size at pregnancy was 63.7 cm TL, and the median size at maternity was 66.2 cm TL. The range of ovarian follicles recorded per female was 1–69; the maximum ovarian fecundity of …

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Psychological Resilience Can Help Combat The Effect Of Stress On Problematic Social Networking Site Usage, Xiang-Ling Hou, Hai-Zhen Wang, Cheng Guo, James Gaskin, Detlef H. Rost, Jin-Liang Wang Jan 2017

Psychological Resilience Can Help Combat The Effect Of Stress On Problematic Social Networking Site Usage, Xiang-Ling Hou, Hai-Zhen Wang, Cheng Guo, James Gaskin, Detlef H. Rost, Jin-Liang Wang

Faculty Publications

This study was aimed to test the association between perceived stress and problematic social networking site (SNS) usage, and to figure outwhether psychological resiliencemoderated this relationship. The Perceived Stress Scale, Connor-Davidson Resilience Scale, and Facebook Intrusion Questionnaire were administered to 499 Chinese college students. The results showed that (1) perceived stress was positively associated with problematic SNS usage; (2) psychological resiliencewas negatively relatedwith problematic SNS usage; and (3) psychological resilience moderated the relationship between perceived stress and problematic SNS usage. Specifically, the relationship between perceived stress and problematic SNS usage was statistically significant for students with a lower level of …

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Region Of Smooth Functions For Positive Solutions To An Elliptic Biological Model, Joon Hyuk Kang, Timothy Robertson Jan 2017

Region Of Smooth Functions For Positive Solutions To An Elliptic Biological Model, Joon Hyuk Kang, Timothy Robertson

Faculty Publications

The non-existence and existence of the positive solution to the generalized elliptic model ∆u+g(u v) = 0 in Ω, ∆v+h(u, v) = 0 in Ω, u=v= 0 on∂Ω, were investigated.

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Optimal Combined Long-Term Facility Design And Short-Term Operational Strategy For Chp Capacity Investments, Jose Mojica, Damon Petersen, Brigham Hansen, Kody Powell, John Hedengren Jan 2017

Optimal Combined Long-Term Facility Design And Short-Term Operational Strategy For Chp Capacity Investments, Jose Mojica, Damon Petersen, Brigham Hansen, Kody Powell, John Hedengren

Faculty Publications

This work presents a detailed case study for the optimization of the expansion of a district energy system evaluating the investment decision timing, type of capacity expansion, and fine-scale operational modes. The study develops an optimization framework to find the investment schedule over 30 years with options of investing in traditional heating sources (boilers) or a next-generation combined heat and power (CHP) plant that provides heat and electricity. In district energy systems, the selected capacity and type of system is dependent on demand-side requirements, energy prices, and environmental costs. This work formulates capacity planning over a time horizon as a …

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