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Gradients In Wall Mechanics And Polysaccharides Along Growing Inflorescence Stems, Pyae Phyo, Tuo Wang, Sarah N. Kiemle, Hugh O’Neill, Sai Venkatesh Pingali, Mei Hong, Daniel J. Cosgrove Dec 2017

Gradients In Wall Mechanics And Polysaccharides Along Growing Inflorescence Stems, Pyae Phyo, Tuo Wang, Sarah N. Kiemle, Hugh O’Neill, Sai Venkatesh Pingali, Mei Hong, Daniel J. Cosgrove

Faculty Publications

© 2017 American Society of Plant Biologists. All Rights Reserved. At early stages of Arabidopsis (Arabidopsis thaliana) flowering, the inflorescence stem undergoes rapid growth, with elongation occurring predominantly in the apical; 4 cm of the stem. We measured the spatial gradients for elongation rate, osmotic pressure, cell wall thickness, and wall mechanical compliances and coupled these macroscopic measurements with molecular-level characterization of the polysaccharide composition, mobility, hydration, and intermolecular interactions of the inflorescence cell wall using solid-state nuclear magnetic resonance spectroscopy and small-angle neutron scattering. Force-extension curves revealed a gradient, from high to low, in the plastic and elastic compliances …

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Species Identification Of Vagrant Empidonax Flycatchers In Northeastern North America Via Non-Invasive Dna Sequencing, Nathan R. Goldberg, Nicholas A. Mason Dec 2017

Species Identification Of Vagrant Empidonax Flycatchers In Northeastern North America Via Non-Invasive Dna Sequencing, Nathan R. Goldberg, Nicholas A. Mason

Faculty Publications

Vagrant individuals from cryptic species complexes pose a persistent challenge for accurate species identification, hindering our understanding of vagrancy in these taxa. Here, we used non-invasive sampling of fecal matter to sequence the ND2 mitochondrial gene of 2 vagrant western flycatchers observed in northeastern North America. The DNAsequence data we recovered from these vagrants fell within a clade of known Empidonax difficillis (Pacific-slope Flycatcher) haplotypes. Our work provides robust records of 2 vagrant Pacific-slope Flycatchers in the northeastern US. These findings illustrate the power of non-invasive sampling for species identification of vagrants from cryptic species complexes.

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The Phylogeny Of Heliconia (Heliconiaceae) And The Evolution Of Floral Presentation, William J.D. Iles, Chodon Sass, Laura Lagomarsino, Gracie Benson-Martin, Heather Driscoll, Chelsea D. Specht Dec 2017

The Phylogeny Of Heliconia (Heliconiaceae) And The Evolution Of Floral Presentation, William J.D. Iles, Chodon Sass, Laura Lagomarsino, Gracie Benson-Martin, Heather Driscoll, Chelsea D. Specht

Faculty Publications

© 2016 Elsevier Inc. Heliconia (Heliconiaceae, order Zingiberales) is among the showiest plants of the Neotropical rainforest and represent a spectacular co-evolutionary radiation with hummingbirds. Despite the attractiveness and ecological importance of many Heliconia, the genus has been the subject of limited molecular phylogenetic studies. We sample seven markers from the plastid and nuclear genomes for 202 samples of Heliconia. This represents ca. 75% of accepted species and includes coverage of all taxonomic subgenera and sections. We date this phylogeny using fossils associated with other families in the Zingiberales; in particular we review and evaluate the Eocene fossil Ensete oregonense. …

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Incorporating Flaxseed (Linum Usitatissimum) Oil Into Queso Blanco At Different Stages Of The Cheese Manufacturing Process, Cristhiam Gurdian, Vondel Reyes, Emmanuel Kyereh, Franklin Bonilla, Cesar Galindo, Alexander Chouljenko, Kevin Mis Solval, Charles Boeneke, Joan M. King, Subramaniam Sathivel Dec 2017

Incorporating Flaxseed (Linum Usitatissimum) Oil Into Queso Blanco At Different Stages Of The Cheese Manufacturing Process, Cristhiam Gurdian, Vondel Reyes, Emmanuel Kyereh, Franklin Bonilla, Cesar Galindo, Alexander Chouljenko, Kevin Mis Solval, Charles Boeneke, Joan M. King, Subramaniam Sathivel

Faculty Publications

The objective of this study was to evaluate the physicochemical and microbial properties of queso blanco (QB) with flaxseed oil (FO) incorporated at different stages of the cheese manufacturing process. Whole milk was homogenized, coagulated with citric acid, salted with NaCl, and the resulting curds were pressed. Then QBFO was produced by incorporating FO during homogenization (QBFO-H), coagulation (QBFO-C), or salting (QBFO-S). The cheeses were stored at 8 °C for 30 days. Significantly lower lipid oxidation in QB was observed when FO was added during coagulation or salting compared to homogenization. However, lipid oxidation values of QBFO-H did not exceed …

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Comparison Of Five Methods For Parameter Estimation Under Taylor's Power Law, Peijian Shi, David A. Ratkowsky, Ningtao Wang, Yang Li, Lei Zhao, Gadi V.P. Reddy, Bai Lian Li Dec 2017

Comparison Of Five Methods For Parameter Estimation Under Taylor's Power Law, Peijian Shi, David A. Ratkowsky, Ningtao Wang, Yang Li, Lei Zhao, Gadi V.P. Reddy, Bai Lian Li

Faculty Publications

Taylor's power law (TPL) can be applied to the mean-variance relationship for various quantities, e.g., population densities over space and time, biomass of plants in the growth processes, developmental rates and growth rates of arthropods at different temperatures, etc. When TPL holds in the grouped data (e.g., the biomass of plants at different investigation times with limited replicates at each investigation), we must consider the heterocedasticity when carrying out the parameter estimation for a given mathematical model. We propose two new target functions based on TPL and attempt to more accurately estimate the model parameter(s). By capturing the mean-variance relationship, …

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Twenty Years Later: An Update To The Birds Of The Biological Dynamics Of Forest Fragments Project, Amazonas, Brazil, Cameron L. Rutt, Vitek Jirinec, Erik I. Johnson, Mario Cohn-Haft, Claudeir F. Vargas, Philip C. Stouffer Dec 2017

Twenty Years Later: An Update To The Birds Of The Biological Dynamics Of Forest Fragments Project, Amazonas, Brazil, Cameron L. Rutt, Vitek Jirinec, Erik I. Johnson, Mario Cohn-Haft, Claudeir F. Vargas, Philip C. Stouffer

Faculty Publications

Although species lists from throughout Amazonia have become available, relatively complete inventories based on longterm work remain rare. Longitudinal comparisons at well-studied sites provide the best opportunities for describing communities and identifying changes in regional avifaunas. Within central Amazonia, no region has received as much consistent ornithological coverage as the terra firme forests north of Manaus, Brazil, at the Biological Dynamics of Forest Fragments Project (BDFFP). Here we provide an updated list of the area, including notes on all species added between 1997 and 2017. We recorded 21 species new for the site, most of which (>75%) are birds …

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Effect Of Lactation On Conceptus-Maternal Interactions At The Initiation Of Implantation In Cattle: I. Effects On The Conceptus Transcriptome And Amino Acid Composition Of The Uterine Luminal Fluid, Niamh Forde, Constantine A. Simintiras, Roger G. Sturmey, Alexander Graf, Eckhard Wolf, Helmut Blum, Pat Lonergan Dec 2017

Effect Of Lactation On Conceptus-Maternal Interactions At The Initiation Of Implantation In Cattle: I. Effects On The Conceptus Transcriptome And Amino Acid Composition Of The Uterine Luminal Fluid, Niamh Forde, Constantine A. Simintiras, Roger G. Sturmey, Alexander Graf, Eckhard Wolf, Helmut Blum, Pat Lonergan

Faculty Publications

Approximately 65-75 days postpartum (dpp), the estrous cycles of nonlactating (dried off immediately postpartum: n = 12) and lactating (n = 13) Holstein Friesian cows were synchronized and on day 7 a single blastocyst derived from superovulated nulliparous Holstein Friesian heifers was transferred to each cow. A control group of nulliparous heifers (n = 8) were synchronized, inseminated to a standing heat, and slaughtered on the same day as nonlactating and lactating recipients (day 19; estrus = day 0). The uterine horn ipsilateral to the corpus luteum was flushed with 10 ml phosphate-buffered saline and the conceptus, and uterine luminal …

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Genome-Wide Microarray Analysis Leads To Identification Of Genes In Response To Herbicide, Metribuzin In Wheat Leaves, Whitney Pilcher, Hana Zandkamiri, Kelly Arceneaux, Stephen Harrison, Niranjan Baisakh Dec 2017

Genome-Wide Microarray Analysis Leads To Identification Of Genes In Response To Herbicide, Metribuzin In Wheat Leaves, Whitney Pilcher, Hana Zandkamiri, Kelly Arceneaux, Stephen Harrison, Niranjan Baisakh

Faculty Publications

Herbicides are an important component of weed management in wheat, particularly in the southeastern US where weeds actively compete with wheat throughout the winter for nutrients and reduce tillering and ultimately the yield of the crop. Some wheat varieties are sensitive to metribuzin, a low-cost non-selective herbicide, leading to leaf chlorosis, stand loss, and decreased yield. Knowledge of the genetics of herbicide tolerance in wheat is very limited and most new varieties have not been screened for metribuzin tolerance. The identification of genes associated with metribuzin tolerance will lead to the development of molecular markers for use in screening breeding …

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Effects Of Isolation On Ant Assemblages Depend On Microhabitat, Xuan Chen, Benjamin Adams, Michael Layne, Christopher Swarzenski, David Norris, Linda Hooper-Bui Dec 2017

Effects Of Isolation On Ant Assemblages Depend On Microhabitat, Xuan Chen, Benjamin Adams, Michael Layne, Christopher Swarzenski, David Norris, Linda Hooper-Bui

Faculty Publications

How isolation affects biological communities is a fundamental question in ecology and conservation biology. Local diversity (α) agnd regional diversity (γ) are consistently lower in insular areas. The pattern of species turnover (β diversity) and the influence of isolation on competitive interactions are less predictable. Differences in communities across microhabitats within an isolated patch could contribute to the variability in patterns related to isolation. Trees form characteristically dense and sparse patches (low vs. high isolation) in floating marshes in coastal Louisiana, and canopy and root areas around these trees could support distinct ant communities. Consequently, trees in floating marshes provide …

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Association Mapping For Traits Related To Nitrogen Use Efficiency In Tropical Maize Lines Under Field Conditions, Júlia Silva Morosini, Leandro De Freitas Mendonça, Danilo Hottis Lyra, Giovanni Galli, Miriam Suzane Vidotti, Roberto Fritsche-Neto Dec 2017

Association Mapping For Traits Related To Nitrogen Use Efficiency In Tropical Maize Lines Under Field Conditions, Júlia Silva Morosini, Leandro De Freitas Mendonça, Danilo Hottis Lyra, Giovanni Galli, Miriam Suzane Vidotti, Roberto Fritsche-Neto

Faculty Publications

Aims: Nitrogen deficiency is one of the most critical abiotic stresses for maize (Zea mays) cultivation worldwide. For a productive and sustainable scenario, developing genotypes more efficient in nitrogen use is essential. This study aimed to identify single nucleotide polymorphism (SNP) markers associated with nitrogen use efficiency (NUE) traits under field conditions and candidate genes related to these markers by genome-wide association study (GWAS). Methods: Sixty-four tropical maize inbred lines were evaluated in ideal and low nitrogen conditions for total root length (TRL) and low nitrogen tolerance index (LNTI). GWAS was performed using a fixed and random model circulating probability …

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Controls On Modern Erosion And The Development Of The Pearl River Drainage In The Late Paleogene, Chang Liu, Peter D. Clift, Andrew Carter, Philipp Böning, Zhaochu Hu, Zhen Sun, Katharina Pahnke Dec 2017

Controls On Modern Erosion And The Development Of The Pearl River Drainage In The Late Paleogene, Chang Liu, Peter D. Clift, Andrew Carter, Philipp Böning, Zhaochu Hu, Zhen Sun, Katharina Pahnke

Faculty Publications

© 2017 Elsevier B.V. The Pearl River and its tributaries drains large areas of southern China and has been the primary source of sediment to the northern continental margin of the South China Sea since its opening. In this study we use a combination of bulk sediment geochemistry, Nd and Sr isotope geochemistry, and single grain zircon U-Pb dating to understand the source of sediment in the modern drainage. We also performed zircon U-Pb dating on Eocene sedimentary rocks sampled by International Ocean Discovery Program (IODP) Expedition 349 in order to constrain the source of sediment to the rift before …

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Oystower | Oystown Multi-Scalar Biomimetic Design For Resilient Coastal Inhabitation, Christopher William James Dec 2017

Oystower | Oystown Multi-Scalar Biomimetic Design For Resilient Coastal Inhabitation, Christopher William James

Honors Capstones

No abstract provided.

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A Communal Catalogue Reveals Earth's Multiscale Microbial Diversity, Luke R. Thompson, Jon G. Sanders, Daniel Mcdonald, Amnon Amir, Joshua Ladau, Kenneth J. Locey, Robert J. Prill, Anupriya Tripathi, Sean M. Gibbons, Gail Ackermann, Jose A. Navas-Molina, Stefan Janssen, Evguenia Kopylova, Yoshiki Vázquez-Baeza, Antonio González, James T. Morton, Siavash Mirarab, Zhenjiang Zech Xu, Lingjing Jiang, Mohamed F. Haroon, Jad Kanbar, Qiyun Zhu, Se Jin Song, Tomasz Kosciolek, Nicholas A. Bokulich, Joshua Lefler, Colin J. Brislawn, Gregory Humphrey, Sarah M. Owens, Jarrad Hampton-Marcell, Donna Berg-Lyons, Valerie Mckenzie, Noah Fierer Nov 2017

A Communal Catalogue Reveals Earth's Multiscale Microbial Diversity, Luke R. Thompson, Jon G. Sanders, Daniel Mcdonald, Amnon Amir, Joshua Ladau, Kenneth J. Locey, Robert J. Prill, Anupriya Tripathi, Sean M. Gibbons, Gail Ackermann, Jose A. Navas-Molina, Stefan Janssen, Evguenia Kopylova, Yoshiki Vázquez-Baeza, Antonio González, James T. Morton, Siavash Mirarab, Zhenjiang Zech Xu, Lingjing Jiang, Mohamed F. Haroon, Jad Kanbar, Qiyun Zhu, Se Jin Song, Tomasz Kosciolek, Nicholas A. Bokulich, Joshua Lefler, Colin J. Brislawn, Gregory Humphrey, Sarah M. Owens, Jarrad Hampton-Marcell, Donna Berg-Lyons, Valerie Mckenzie, Noah Fierer

Faculty Publications

© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Our growing awareness of the microbial world's importance and diversity contrasts starkly with our limited understanding of its fundamental structure. Despite recent advances in DNA sequencing, a lack of standardized protocols and common analytical frameworks impedes comparisons among studies, hindering the development of global inferences about microbial life on Earth. Here we present a meta-analysis of microbial community samples collected by hundreds of researchers for the Earth Microbiome Project. Coordinated protocols and new analytical methods, particularly the use of exact sequences instead of clustered operational taxonomic units, enable …

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Mechanical Shielding Of Rapidly Growing Cells Buffers Growth Heterogeneity And Contributes To Organ Shape Reproducibility, Nathan Hervieux, Satoru Tsugawa, Antoine Fruleux, Mathilde Dumond, Anne Lise Routier-Kierzkowska, Tamiki Komatsuzaki, Arezki Boudaoud, John C. Larkin, Richard S. Smith, Chun Biu Li, Olivier Hamant Nov 2017

Mechanical Shielding Of Rapidly Growing Cells Buffers Growth Heterogeneity And Contributes To Organ Shape Reproducibility, Nathan Hervieux, Satoru Tsugawa, Antoine Fruleux, Mathilde Dumond, Anne Lise Routier-Kierzkowska, Tamiki Komatsuzaki, Arezki Boudaoud, John C. Larkin, Richard S. Smith, Chun Biu Li, Olivier Hamant

Faculty Publications

© 2017 Elsevier Ltd A landmark of developmental biology is the production of reproducible shapes, through stereotyped morphogenetic events. At the cell level, growth is often highly heterogeneous, allowing shape diversity to arise. Yet, how can reproducible shapes emerge from such growth heterogeneity? Is growth heterogeneity filtered out? Here, we focus on rapidly growing trichome cells in the Arabidopsis sepal, a reproducible floral organ. We show via computational modeling that rapidly growing cells may distort organ shape. However, the cortical microtubule alignment along growth-derived maximal tensile stress in adjacent cells would mechanically isolate rapidly growing cells and limit their impact …

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Cosmopolitan Species As Models For Ecophysiological Responses To Global Change: The Common Reed Phragmites Australis, Franziska Eller, Hana Skálová, Joshua S. Caplan, Ganesh P. Bhattarai, Melissa K. Burger, James T. Cronin, Wen Yong Guo, Xiao Guo, Eric L.G. Hazelton, Karin M. Kettenring, Carla Lambertini, Melissa K. Mccormick, Laura A. Meyerson, Thomas J. Mozdzer, Petr Pyšek, Brian K. Sorrell, Dennis F. Whigham, Hans Brix Nov 2017

Cosmopolitan Species As Models For Ecophysiological Responses To Global Change: The Common Reed Phragmites Australis, Franziska Eller, Hana Skálová, Joshua S. Caplan, Ganesh P. Bhattarai, Melissa K. Burger, James T. Cronin, Wen Yong Guo, Xiao Guo, Eric L.G. Hazelton, Karin M. Kettenring, Carla Lambertini, Melissa K. Mccormick, Laura A. Meyerson, Thomas J. Mozdzer, Petr Pyšek, Brian K. Sorrell, Dennis F. Whigham, Hans Brix

Faculty Publications

© 2017 Eller, Skálová, Caplan, Bhattarai, Burger, Cronin, Guo, Guo, Hazelton, Kettenring, Lambertini, McCormick, Meyerson, Mozdzer, Pyšek, Sorrell, Whigham and Brix. Phragmites australis is a cosmopolitan grass and often the dominant species in the ecosystems it inhabits. Due to high intraspecific diversity and phenotypic plasticity, P. australis has an extensive ecological amplitude and a great capacity to acclimate to adverse environmental conditions; it can therefore offer valuable insights into plant responses to global change. Here we review the ecology and ecophysiology of prominent P. australis lineages and their responses to multiple forms of global change. Key findings of our review …

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High-Throughput Droplet Barcoding And Automated Image Analysis In Microfluidic Droplet Trapping Array, Manibarathi Vaithiyanathan Nov 2017

High-Throughput Droplet Barcoding And Automated Image Analysis In Microfluidic Droplet Trapping Array, Manibarathi Vaithiyanathan

LSU Master's Theses

Molecularly-targeted therapeutics and personalized medicine have dramatically increased the median survival rate of patients suffering from cancer. However, cellular heterogeneity and the personalized nature of cancer have resulted in the limited success of single drug treatments which has led to the use of multiple therapeutic combinations. This has required the development of new analytical methods capable of multiplexed high-throughput screening (HTS) technologies necessary to identify is single or multi-agent therapies are effective in ex vivo samples like liquid biopsies. Droplet microfluidic devices have garnered significant interest to facilitate high-throughput, single cell analysis of heterogeneous populations. However, these devices are still …

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A Study Of The Urban Red Fox (Vulpes Vulpes) Population In Baton Rouge, Louisiana Using Social Media, Ahsennur Soysal Nov 2017

A Study Of The Urban Red Fox (Vulpes Vulpes) Population In Baton Rouge, Louisiana Using Social Media, Ahsennur Soysal

LSU Master's Theses

Foxes are timid yet resourceful animals that are integrated into many urban environments. Because they are elusive, collecting information about the number of urban foxes, their diet and spatial distribution, their interactions with the ecological community in their urban habitat, as well as residents’ response to them, is difficult. Involving stakeholders to participate in the data collection on wildlife via citizen science on social media is one way to overcome this complication, while simultaneously engaging residents in the ecology happening around them. Therefore, we used social media as the platform to engage the public to document and map the foxes …

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Growth And Development Of Two Broiler Strains With Low Protein And Crystalline Amino Acid Supplemented Diets, Chaoyang Li Nov 2017

Growth And Development Of Two Broiler Strains With Low Protein And Crystalline Amino Acid Supplemented Diets, Chaoyang Li

LSU Master's Theses

The objective of this research was to compare the growth performance of broilers from two commercial breeds with control, low protein and low protein supplemented with crystalline amino acids diets. This was a randomized block design, and identical experiments were conducted on successively in two years. In each experiment, day-old chicks, Ross 708 broilers and Cobb 405 broilers, were randomly assigned into three dietary treatments: 1) positive control, 2) low crude protein (LP), and 3) LP + crystalline amino acids (CAA). A three phase feeding program was used. Feed and water were provided ad-libitum. On d 12, 19, 26, 33, …

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Patterns In Abundance Of Louisiana’S Avifauna Revealed By The Louisiana Bird Atlas Project, Matthew L. Brady Nov 2017

Patterns In Abundance Of Louisiana’S Avifauna Revealed By The Louisiana Bird Atlas Project, Matthew L. Brady

LSU Master's Theses

The Louisiana Bird Atlas Project is a multi-year citizen science effort designed to quantify bird distribution and abundance for all species regularly occurring in the state of Louisiana during two time periods: summer and winter. Data were collected by volunteers in a citizen science framework across eight years, from 2007 to 2014. A total of 351 species was recorded (254 during the Summer Bird Atlas and 315 during the Winter Bird Atlas). Maps showing distribution and relative abundance for each species were generated within a Geographical Information System, and were accompanied by short descriptions of status, distribution, abundance, and other …

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Occurrence Of Putative Endornaviruses In Non-Cultivated Plant Species And Characterization Of A Novel Endornavirus In Geranium Carolinianum, Rachel Herschlag Nov 2017

Occurrence Of Putative Endornaviruses In Non-Cultivated Plant Species And Characterization Of A Novel Endornavirus In Geranium Carolinianum, Rachel Herschlag

LSU Master's Theses

Endornaviruses are RNA viruses, which can infect plants yet cause no apparent symptoms. To date, most descriptions of endornaviruses infecting plants have been in cultivated species. A survey for endornaviruses in non-cultivated plants was initiated in 2015 and continued through 2017 in Baton Rouge, Louisiana. Two hundred and seven plant species were tested for distinctive dsRNA profiles by selective extraction and gel electrophoresis, of which seven contained endornavirus-like dsRNA. RT-PCR amplification of an endornavirus-specific sequence supported the endornavirus nature of six of the seven samples. Of the six host species, one species, Geranium carolinianum was confirmed as being infected with …

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Expression, Purification And Characterization Of Egf27 From The Notch1 Abruptex Region, Huimin Zhong Nov 2017

Expression, Purification And Characterization Of Egf27 From The Notch1 Abruptex Region, Huimin Zhong

LSU Master's Theses

Notch proteins are transmembrane proteins and act as receptors in Notch signaling, which is related to diverse developmental diseases including cancer.1-2 The mouse Notch1 protein contains 36 tandem epidermal growth factor-like (EGF) repeats in the extracellular domain (ECD).1-2 Our research project focused on the structural study of the Abruptex region consisting of EGF24-29 in the ECD. The fact that this region is a potential competitor to a Notch ligand, because of its high glycosylation and flexibility, makes it important to solve the three-dimensional structure and investigate the glycosylation effect on the structure of the Abruptex region.3 By …

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Scaling Relationships Between Cranial Morphological Features And Cranial Capacity In Modern Humans, Jacob Jesch Nov 2017

Scaling Relationships Between Cranial Morphological Features And Cranial Capacity In Modern Humans, Jacob Jesch

LSU Master's Theses

Certain cranial morphologies referred to here as “cranial predictor features” are known to allometrically scale with body mass at statistically significant levels. Brain size likewise is known to scale with body mass, with brain-to-body-mass ratio being expressed numerically via the encephalization quotient. The study at hand aims to demonstrate whether brain size via its skeletal proxy of cranial capacity also scales with cranial predictor features. Correlation analysis was employed on two samples of contemporary male and female modern humans, respectively, in order to determine the statistical significance and degree of association between cranial predictor features and cranial capacity, as well …

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Development Of Remote Hydroxylation Via Redox Catalysis And Mild Activation Of Thioglycosides For O-Glycosylation, Kristina Deveaux Nov 2017

Development Of Remote Hydroxylation Via Redox Catalysis And Mild Activation Of Thioglycosides For O-Glycosylation, Kristina Deveaux

LSU Doctoral Dissertations

The focus of this dissertation is the development of a C-H functionalization method using redox catalysis and the synthesis of saccharides using thioglycosides. Chapter 1 is a review of C-H functionalization and visible-light photoredox catalysis. Over the years there have been many significant contributions to the field of C-H functionalization. Select examples have been discussed and a foundation for the method developed in chapter 2 has been outlined. Chapter 2 discusses the development and optimization of a C-H functionalization method. This approach uses the Tzo directing group and Ir(ppy)3 to activate a remote C-H bond via 1,6- and …

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Diatom Transcriptional And Physiological Responses To Changes In Iron Bioavailability Across Ocean Provinces, Natalie R. Cohen, Kelsey A. Ellis, Robert H. Lampe, Heather Mcnair, Benjamin S. Twining, Maria T. Maldonado, Mark A. Brzezinski, Fedor I. Kuzminov, Kimberlee Thamatrakoln, Claire P. Till, Kenneth W. Bruland, William G. Sunda, Sibel Bargu, Adrian Marchetti Nov 2017

Diatom Transcriptional And Physiological Responses To Changes In Iron Bioavailability Across Ocean Provinces, Natalie R. Cohen, Kelsey A. Ellis, Robert H. Lampe, Heather Mcnair, Benjamin S. Twining, Maria T. Maldonado, Mark A. Brzezinski, Fedor I. Kuzminov, Kimberlee Thamatrakoln, Claire P. Till, Kenneth W. Bruland, William G. Sunda, Sibel Bargu, Adrian Marchetti

Faculty Publications

Changes in iron (Fe) bioavailability influence diatom physiology and community composition, and thus have a profound impact on primary productivity and ecosystem dynamics. Iron limitation of diatom growth rates has been demonstrated in both oceanic and coastal waters of the Northeast Pacific Ocean and is predicted to become more pervasive in future oceans. However, it is unclear how the strategies utilized by phytoplankton to cope with low Fe bioavailability and resupply differ across these ocean provinces. We investigated the response of diatom communities to variable Fe conditions through incubation experiments performed in the Fe mosaic of the California Upwelling Zone …

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Evaluation Of Reproductive Phenology And Ecology Of Eastern Wild Turkey (Meleagris Gallopavo Silvestris) In South Carolina, Patrick Wightman Nov 2017

Evaluation Of Reproductive Phenology And Ecology Of Eastern Wild Turkey (Meleagris Gallopavo Silvestris) In South Carolina, Patrick Wightman

LSU Master's Theses

Many southeastern states, including South Carolina, in the last 10 -15 years have seen a decline in Eastern wild turkey (Meleagris gallopavo silvestris) populations. Around 50,000 turkey hunters in South Carolina, result in approximately 35 million annually in revenue. Turkeys encounter a unique situation as environmental variation and hunter activity may impact behaviors as hunting occurs during the reproductive season. Mistimed hunting seasons could result in population declines. Timing of harvest requires managers to implement seasons that allow for hunter satisfaction (hearing gobbles) while ensuring no detriment to turkey populations through impacts to reproduction. To better understand factors influencing gobbling …

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Producing "Fabulous": Commodification And Ethnicity In Hair Braiding Salons, Sylviane Ngandu-Kalenga Greensword Nov 2017

Producing "Fabulous": Commodification And Ethnicity In Hair Braiding Salons, Sylviane Ngandu-Kalenga Greensword

LSU Doctoral Dissertations

Black women wearing fabulous braids are a striking feature of the Afro-diasporic cultural landscape. However, the braiders and salon owners who enable this aesthetic engineering are seldom acknowledged. This dissertation investigates the experience and role of Caribbean and West and Central African women in the hair braiding industry, a rapidly growing business in the U.S. I address the complexity of these women’s multiple social roles and the multiple consciousness (King, 1988) associated with their demographic characteristics (color, ethnicity, gender, nationality, and immigrant status). The commonalities between the braiders and their mostly African American customers contrast vividly with their perception of …

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Evaluating The Effect Of Chitosan, Water-Soluble Chitosan And Chitosan Application Techniques On The Quality Of Refrigerated Catfish Fillets, Franklin Bonilla Torres Nov 2017

Evaluating The Effect Of Chitosan, Water-Soluble Chitosan And Chitosan Application Techniques On The Quality Of Refrigerated Catfish Fillets, Franklin Bonilla Torres

LSU Master's Theses

Chitosan (CH) is a biopolymer synthetized by deacetylation of chitin, it is found in the exoskeleton of crustaceans, cell wall of fungi, and insects. CH’s water insolubility limited the used of this compound in some food systems. However, enzymatic hydrolysis of CH yields water-soluble chitosan (WSC). The aim of this study was to evaluate the effect of chitosan, water-soluble chitosan, and chitosan application techniques on the quality of refrigerated catfish fillets. This research was conducted in two separated studies. In the first study, three solution treatments were prepared: (1) a 1% acetic acid (AA) solution, (2) a 0.5% CH solution …

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Measurement And Modeling Of Out-Of-Field Doses From Various Advanced Post-Mastectomy Radiotherapy Techniques, Jihyung Yoon, David Heins, Xiaodong Zhao, Mary Sanders, Rui Zhang Nov 2017

Measurement And Modeling Of Out-Of-Field Doses From Various Advanced Post-Mastectomy Radiotherapy Techniques, Jihyung Yoon, David Heins, Xiaodong Zhao, Mary Sanders, Rui Zhang

Faculty Publications

More and more advanced radiotherapy techniques have been adopted for post-mastectomy radiotherapies (PMRT). Patient dose reconstruction is challenging for these advanced techniques because they increase the low out-of-field dose area while the accuracy of out-of-field dose calculations by current commercial treatment planning systems (TPSs) is poor. We aim to measure and model the out-of-field radiation doses from various advanced PMRT techniques. PMRT treatment plans for an anthropomorphic phantom were generated, including volumetric modulated arc therapy with standard and flattening-filter-free photon beams, mixed beam therapy, 4-field intensity modulated radiation therapy (IMRT), and tomotherapy. We measured doses in the phantom where the …

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Evidence Of Subglacial Brine Inflow And Wind-Induced Mixing From High Resolution Temperature Measurements In Lake Bonney, Antarctica, Jade Lawrence Nov 2017

Evidence Of Subglacial Brine Inflow And Wind-Induced Mixing From High Resolution Temperature Measurements In Lake Bonney, Antarctica, Jade Lawrence

LSU Master's Theses

Hypersaline brine beneath Taylor Glacier enters proglacial West Lobe Lake Bonney (WLB) subglacially as well as from Blood Falls, a surface discharge point at the Taylor Glacier terminus. The brine strongly influences the water column of WLB. Because of the extremely high salinities below the chemocline in WLB, density is determined almost entirely by salinity and temperature can be used as a passive tracer. Cold brine intrusions enter WLB at the glacier face and intrude in to the water column at the depth of neutral buoyancy, where they can be identified by anomalously cold temperatures at that depth. This study …

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The Impact Of Co2-Related Ocean Acidification On The Molecular Regulation Of Shell Development In The Eastern Oyster (Crassostrea Virginica)., Mackenzie L. Richards Nov 2017

The Impact Of Co2-Related Ocean Acidification On The Molecular Regulation Of Shell Development In The Eastern Oyster (Crassostrea Virginica)., Mackenzie L. Richards

LSU Master's Theses

Eastern oysters (Crassostrea virginica), native to the Gulf of Mexico, are keystone species in estuarine ecosystems and are economically valued. Current research indicates that ocean acidification adversely affects the physiology and morphology of larval oysters, but the molecular mechanisms of this impact remain unstudied. Ocean acidification is contributed to by elevated atmospheric CO2 due to increased anthropogenic activities, causing heightened partial pressure of CO2 (pCO2), and eutrophication from land-based runoff in the Gulf. The objective of this work was to determine the genomic response of the eastern oyster in Louisiana to simulated ocean acidification. …

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