Physical Sciences and Mathematics Commons^™

Adsorption And Transport Of Colloids At Interface And In Bulk, Jingyun Lee

LSU Doctoral Dissertations

Colloids are suspensions of microscopic insoluble particles dispersed in a continuum phase such as liquid or gas. Colloids are found in our everyday life from food and cosmetic industries to pharmaceutical and biomedical applications. Depending on a global minimum of the free-energy landscape, colloidal suspensions can be classified as two major classes: equilibrium or active colloidal system. This Ph.D dissertation presents strategies to engineer equilibrium self-assembled structures and out-of-equilibrium active matter using various interparticle forces.

First, we introduce the means to promote the equilibrium self-assembled structures driven by adsorption of colloids at interface. Typically, adsorption of colloids at interface is …

Vimentin Tunes Cell Migration On Collagen By Controlling Β1 Integrin Activation And Clustering, Zofia Ostrowska-Podhorodecka, Isabel Ding, Wilson Lee, Jelena Tanic, Sevil Abbasi, Pamma D. Arora, Richard S. Liu, Alison E. Patteson, Paul A. Janmey, Christopher A. Mcculloch

Physics - All Scholarship

Vimentin is a structural protein that is required for mesenchymal cell migration and directly interacts with actin, β1 integrin and paxillin. We examined how these interactions enable vimentin to regulate cell migration on collagen. In fibroblasts, depletion of vimentin increased talin-dependent activation of β1 integrin by more than 2-fold. Loss of vimentin was associated with reduction of β1 integrin clustering by 50% and inhibition of paxillin recruitment to focal adhesions by more than 60%, which was restored by vimentin expression. This reduction of paxillin was associated with 65% lower Cdc42 activation, a 60% reduction of cell extension formation and a …

Mathematical Modeling Of The Candida Albicans Yeast To Hyphal Transition Reveals Novel Control Strategies, David J. Wooten, Jorge Gómez Tejeda Zañudo, David Murrugarra, Austin M. Perry, Anna Dongari-Bagtzoglou, Reinhard Laubenbacher, Clarissa J. Nobile, Réka Albert

Mathematics Faculty Publications

Candida albicans, an opportunistic fungal pathogen, is a significant cause of human infections, particularly in immunocompromised individuals. Phenotypic plasticity between two morphological phenotypes, yeast and hyphae, is a key mechanism by which C. albicans can thrive in many microenvironments and cause disease in the host. Understanding the decision points and key driver genes controlling this important transition and how these genes respond to different environmental signals is critical to understanding how C. albicans causes infections in the host. Here we build and analyze a Boolean dynamical model of the C. albicans yeast to hyphal transition, integrating …

Heterogeneous Bacterial Swarms With Mixed Lengths, Shlomit Peled, Shawn D. Ryan, Sebastian Heidenreich, Markus Baer, Gil Ariel, Avraham Be'er

Mathematics and Statistics Faculty Publications

Heterogeneous systems of active matter exhibit a range of complex emergent dynamical patterns. In particular, it is difficult to predict the properties of the mixed system based on its constituents. These considerations are particularly significant for understanding realistic bacterial swarms, which typically develop heterogeneities even when grown from a single cell. Here, mixed swarms of cells with different aspect ratios are studied both experimentally and in simulations. In contrast with previous theory, there is no macroscopic phase segregation. However, locally, long cells act as nucleation cites, around which aggregates of short, rapidly moving cells can form, resulting in enhanced swarming …

Forecasting Of The Covid-19 Epidemic: A Scientometric Analysis, Pandri Ferdias, Ansari Saleh Ahmar

Library Philosophy and Practice (e-journal)

This study presented a scientometric analysis of scientific publications with discussions of forecasting and COVID-19. The data of this study were obtained from the Scopus database using the keywords: ( TITLE-ABS-KEY (forecast) AND TITLE-ABS-KEY (covid)) and the data were taken on March 26, 2021. This study was a scientometric study. The data were subsequently analyzed using the VosViewer and Bibliometrix R Package. The results showed that “COVID-19” was the keyword most frequently used by researchers, followed by “forecasting” and “human”. Authors who discussed the topic of forecasting COVID-19 come from 83 different countries/regions, with the most articles sent by authors …

Tribal Revegetation Project Final Project Report: 92-Acre Area, Area 5 Radioactive Waste Management Complex, Nevada National Security Site, Nevada, Jeremy Spoon, Brittany Kruger, Richard Arnold, Kate Monti Barcalow, Tribal Revegetation Committee, Trc

Anthropology Faculty Publications and Presentations

Nuwu (Southern Paiute), Newe (Western Shoshone), and Nuumu (Owens Valley Paiute) are linguistically related, Numic-speaking peoples who are part of the broader Uto-Aztecan language group. Numic peoples view the land as a holistic, living, sentient being with feelings and purpose. The land is personified with human characteristics and it needs to be experienced to be understood through “learning by doing.” Numic peoples do not support ground disturbing activities within their ancestral lands, including activities tied to the storage of low-level radioactive waste or classified materials on the NNSS, which they view as culturally inappropriate. These deep-rooted ancestral connections are the …

Effects Of Different Salts And Concentrations On Germination And Growth Of Leymus Chinensis, L. H. Huang, Z. W. Liang, H. Y. Ma, M. Liu, C. Yan, Z. C. Wang

IGC Proceedings (1993-2023)

No abstract provided.

Effects Of Grazing On Wind Driven Matter Fluxes In The Xilingele Grassland, Inner Mongolia, C. Hoffmann, R. Funk

IGC Proceedings (1993-2023)

No abstract provided.

Desertification Mapping By Iranian Classification Of Desertification (Icd) Method Case Study: Kohdasht Watershed In Iran, G. R. Zehtabian, G. R. Chamanpira, H. Ahmadi, H. Khosravi

IGC Proceedings (1993-2023)

No abstract provided.

Energy Balance Analysis Of Integrated Crop‐Livestock Production System In Tianshui Town, Huanxian County Of Gansu Province, Xiaoyan Wang, Fujiang Hou, Randall Jones

IGC Proceedings (1993-2023)

No abstract provided.

Effect Of Oxytropis Species Consumption On Sheep Forage Preference In Northeastern Qing‐Tibetan Plateau, Shengyao Wang, Kun Wang, Yonglai Zh.

IGC Proceedings (1993-2023)

No abstract provided.

Is The Relationship Between Mining And Climate Change Only One-Way? Climate Change Potential Impacts On Mining Activity – Hazards, Risks And Adaptation Measures, Małgorzata Markowska

Journal of Sustainable Mining

No abstract provided.

Effect Of Sexual Reproduction And Seedling Recruitment On Vegetation Dynamics In Grasslands, Christian Huyghe, Isabelle Litrico, F. I. Martinez, M. Philip Rolston

IGC Proceedings (1993-2023)

No abstract provided.

Seed Production Of Native Grassland Plants, M. Philip Rolston, Christian Huyghe

IGC Proceedings (1993-2023)

No abstract provided.

Establishment And Effects On Soil And Pasture Of Diverse Arrangements Of Acacia Decurrens, Acacia Melanoxylon And Alnus Acuminata As Silvopasture Systems In The High Tropic In Colombia, A. Conde, L. L. Betancourt, C. J. Jaramillo, A. Umaña, D. Barrera, D. R. Chamorro

IGC Proceedings (1993-2023)

No abstract provided.

Sustainable Agricultural And Rural Development In Semi‐Arid Environment When Supplementing Rainfall With 200 Mm Irrigation Water Per Year, Benzarti Jalila, Ben Youssef Salah

IGC Proceedings (1993-2023)

No abstract provided.

Animal Unit Weight And Daily Requirement Of Sangsary Sheep Breed, Hossein Arzani, Mehdi Ghorbani, A. Nikkhah, Hossein Azarnivand

IGC Proceedings (1993-2023)

No abstract provided.

Companion Crops For Pasture Establishment In The State Of Minas Gerais, Brazil, I. F. Andrade, P. Schmidt

IGC Proceedings (1993-2023)

No abstract provided.

The Value Accounting Index System And Application Of Degenerative Grassland — A Case Study On Chen Barng Banner In Hulunbeir Grassland, Jianhui Yin

IGC Proceedings (1993-2023)

No abstract provided.

Supported Bilayer Membranes For Reducing Cell Adhesion In Microfluidic Devices [Post-Print], Julia R. Clapis, Mengqi Jonathan Fan, Michelle Kovarik

Faculty Scholarship

The high surface area-to-volume ratio of microfluidic channels makes them susceptible to fouling and clogging when used for biological analyses, including cell-based assays. We evaluated the role of electrostatic and van der Waals interactions in cell adhesion in PDMS microchannels coated with supported lipid bilayers and identified conditions that resulted in minimal cell adhesion. For low ionic strength buffer, optimum results were obtained for a zwitterionic coating of pure egg phosphatidylcholine; for a rich growth medium, the best results were obtained for zwitterionic bilayers or those with slight negative or moderate positive charge from the incorporation of 5-10 mol% egg …

Flocc: From Agent-Based Models To Interactive Simulations On The Web, Scott Donaldson

Northeast Journal of Complex Systems (NEJCS)

Agent-based modeling (ABM) is a computational technique wherein systems are represented through the actions and interactions of many individual entities (‘agents’) over time. ABM often attempts to elucidate the unpredictable, high-level behavior of systems through the predictable, low-level behavior of actors within the system. There are currently few software or frameworks for ABM that allow modelers to design and build interactive models on the web, for a wide audience as well as a scientifically literate audience well-versed in complexity, models, and simulations. Flocc is a novel framework for agent-based modeling written in JavaScript, the lingua franca programming language of the …

Integrated Cyberattack Detection And Handling For Nonlinear Systems With Evolving Process Dynamics Under Lyapunov-Based Economic Model Predictive Control, Keshav Kasturi Rangan, Henrique Oyama, Helen Durand

Chemical Engineering and Materials Science Faculty Research Publications

Safety-critical processes are becoming increasingly automated and connected. While automation can increase effciency, it brings new challenges associated with guaranteeing safety in the presence of uncertainty especially in the presence of control system cyberattacks. One of the challenges for developing control strategies with guaranteed safety and cybersecurity properties under suffcient conditions is the development of appropriate detection strategies that work with control laws to prevent undetected attacks that have immediate closed-loop stability consequences. Achieving this, in the presence of uncertainty brought about by plant/model mismatch and process dynamics that can change with time, requires a fundamental understanding of the characteristics …

First-Principles Study Of A Mos2-Pbs Van Derwaals Heterostructure Inspired By Naturally Occurring Merelaniite, Gemechis Degaga, Sumandeep Kaur, Ravindra Pandey, John Jaszczak

Michigan Tech Publications

Vertically stacked, layered van der Waals (vdW) heterostructures offer the possibility to design materials, within a range of chemistries and structures, to possess tailored properties. Inspired by the naturally occurring mineral merelaniite, this paper studies a vdW heterostructure composed of a MoS2 monolayer and a PbS bilayer, using density functional theory. A commensurate 2D heterostructure film and the corresponding 3D periodic bulk structure are compared. The results find such a heterostructure to be stable and possess p-type semiconducting characteristics. Due to the heterostructure’s weak interlayer bonding, its carrier mobility is essentially governed by the constituent layers; the hole mobility is …

Antioxidant Properties Of Pecan Shell Bioactive Components Of Different Cultivars And Extraction Methods, Cameron Cason, Veerachandra K. Yemmireddy, Juan Moreira, Achyut Adhikari

School of Earth, Environmental, and Marine Sciences Faculty Publications and Presentations

Pecan shells are a rich source of various bioactive compounds with potential antioxidant and antimicrobial properties. This study investigated the effect of pecan variety and method extraction on the antioxidant property of shell extracts. Twenty different varieties of pecan shells were subjected to either aqueous or ethanolic extraction and were examined for total phenolics and antiradical activity. The phenolic content and antiradical activity of shell extracts were significantly (p < 0.05) varied with different pecan cultivars. The total phenolic content of ethanol extracts ranged from 304.2 (Caddo) to 153.54 (Cherokee) mg GAE/g of dry extract and was significantly greater (p < 0.05) than those obtained by aqueous extraction. The antiradical activity of ethanol extracts ranged from 840.6 (Maramec) to 526.74 (Caper Fear) mg TEg−1, while aqueous extracts ranged from 934.9 (Curtis) to 468.3 (Elliot) mg TEg−1. Chemical profiling of the crude and acid hydrolyzed extracts was performed by reverse phase high performance liquid chromatography and flow injection electrospray ionization mass spectrometry. Lignin degradation products such as lignols, dilignols, trilignols, and oligolignols were found to be the major components of tested extracts. Phenolic content and antiradical activity of pecan shell extracts are significantly varied with cultivars and methods of extraction.

Hydro-Morphodynamics Of Sandy Coastal Embayments, Shamim Murshid

LSU Doctoral Dissertations

This dissertation investigates the hydro-morphodynamics of two major components of a sandy coastal environment: tidal inlets and embayment shorelines. In the first study, I focused on the evolution of inlet geometry by compiling and analyzing a database with 226 inlets worldwide with a special attention given to their width to depth ratio (or aspect ratio). I found that the aspect ratio has a weak dependency on tidal range and wave height, and they lie in different ranges for three types of tidal inlets: engineered, natural single-thread, and natural compound. I also developed a 2D hydro-morphodynamic model of an idealized barrier-inlet …

The Study On The Mathematics Model Of Forage Type Mulberry High‐Output Cultivation And Optimizing Plan, Shuangyin Sun

IGC Proceedings (1993-2023)

No abstract provided.

Studies On Effect Of Intercropping Forage Grasses In Young Forestries On The Hilly Areas In South China, Keyun Li, Kexin Liu, Lingling He

IGC Proceedings (1993-2023)

No abstract provided.

Genetic Study On The Biological Characteristics Of F1 Hybrids Between Sorghum Bicolor And Sorghum Sudanense, Haiming Zhao, Nan Xie, Yuan Li, Guibo Liu

IGC Proceedings (1993-2023)

No abstract provided.

Dendrolobium Spp. — A Source Of Tropical Multipurpose Legumes, R. Schultze‐Kraft, M. Peters, L. H. Franco, B. Hincapié

IGC Proceedings (1993-2023)

No abstract provided.

Non-Linear Effects Of Solution Parameters And Gamma Radiation On Nickel Oxidation Dynamics, Razieh Karimihaghighi

Electronic Thesis and Dissertation Repository

Nickel is the main component in nickel-based superalloys which are known for their superior corrosion resistance and mechanical properties. These alloys are used in nuclear power plants, mainly for thin-walled heat exchanger tubing where these materials are exposed to a continuous flux of ionizing radiation. The long-term corrosion behaviour of these alloys at high temperatures and in the presence of gamma-radiation is not well understood. Moreover, the mechanism by which nickel improves the corrosion resistance of these alloys is also not known. Therefore, a mechanistic understanding of the nickel oxidation process is required to develop a predictive corrosion model for …