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Articles 10471 - 10500 of 255677
Full-Text Articles in Life Sciences
The Island Biogeography Of Mangrove-Dwelling Vertebrates: Isolation, Specialisation, And Extinction, Jian Xiong David Tan
The Island Biogeography Of Mangrove-Dwelling Vertebrates: Isolation, Specialisation, And Extinction, Jian Xiong David Tan
Biology ETDs
Mangroves are highly dynamic ecosystems that are widely distributed across the coastlines of the tropics and subtropics. Despite their low plant diversity, mangroves host a disproportionately high number of terrestrial vertebrate taxa. However, mangrove specialists — taxa that only occur in mangrove habitats — exhibit a global distribution that is incongruous with the broader background distribution patterns of mangrove-associated fauna, exhibiting higher diversity in Australia and Southeast Asia. This dissertation therefore aims to assess how the diversity and distribution of mangrove specialist fauna may have been shaped by the historical biogeography of mangroves, and the effects of mangrove specialisation on …
Plant Reproductive Strategies Shift In Response To Restoration Using Beaver Dam Analogs, Laurel F. Martinez
Plant Reproductive Strategies Shift In Response To Restoration Using Beaver Dam Analogs, Laurel F. Martinez
Biology ETDs
As riparian communities become increasingly degraded, restoration treatments are being implemented in streams to recover ecosystem functions. In the Jemez Mountains, beaver dam analogs (BDAs) are used to restore degraded streams by connecting the floodplain and increasing the extent of anoxic soil conditions. These environmental disturbances are expected to alter how riparian plants recruit, particularly their allocation to seed-based and vegetative regeneration strategies. We investigated whether BDAs and associated changes in soil water filled pore space (WFPS) affected riparian plant recruitment. We investigated the number of flowering stems as a proxy for seed-based regeneration and rhizome length and mass as …
Ecoimmunology Of Dirty Physella Acuta Snails, Kevin Arthur Mcquirk
Ecoimmunology Of Dirty Physella Acuta Snails, Kevin Arthur Mcquirk
Biology ETDs
Research on Physella acuta, an invasive freshwater snail, reveals insights into its parasitology, fitness, and molecular biology. Morphological and molecular analyses revealed two distinct mitogenomic lineages, local (B) and invasive (A) strains of native P. acuta, both having comparable trematode infection rates, suggesting that the low infection rates observed from A in invaded regions result from "enemy release" rather than immune incompatibility. Fitness assessments showed that while lineages A and B performed similarly under laboratory conditions, rewilding experiments revealed significantly higher fitness in lineage A. Transcriptomic profiling supported these differences, with A snails showing greater immune-related gene expression and …
Elevated Nr2f1 Underlies The Persistence Of Invasive Disease After Treatment Of Braf-Mutant Melanoma, Manoela Tiago, Timothy J. Purwin, Casey D. Stefanski, Renaira Oliveira Da Silva, Mitchell E. Fane, Yash Chhabra, Jelan I. Haj, Jessica L. F. Teh, Rama Kadamb, Weijia Cai, Sheera Rosenbaum, Vivian Chua, Nir Hacohen, Michael A. Davies, Jessie Villanueva, Inna Chervoneva, Ashani T. Weeraratna, Dan A. Erkes, Claudia Capparelli, Julio A. Aguirre-Ghiso, Andrew E. Aplin
Elevated Nr2f1 Underlies The Persistence Of Invasive Disease After Treatment Of Braf-Mutant Melanoma, Manoela Tiago, Timothy J. Purwin, Casey D. Stefanski, Renaira Oliveira Da Silva, Mitchell E. Fane, Yash Chhabra, Jelan I. Haj, Jessica L. F. Teh, Rama Kadamb, Weijia Cai, Sheera Rosenbaum, Vivian Chua, Nir Hacohen, Michael A. Davies, Jessie Villanueva, Inna Chervoneva, Ashani T. Weeraratna, Dan A. Erkes, Claudia Capparelli, Julio A. Aguirre-Ghiso, Andrew E. Aplin
Department of Pharmacology, Physiology, and Cancer Biology Faculty Papers
Despite the success of targeted inhibitors in cutaneous melanoma, therapeutic responses are limited by the aged tumor microenvironment and drug-tolerant residual cells. Given the similarities between drug tolerance and cellular dormancy, we studied the dormancy marker, nuclear receptor subfamily 2 group F member 1 (NR2F1), in response to BRAF-V600E inhibitors (BRAFi) plus MEK inhibitors (MEKi) in BRAF-mutant melanoma models. Transcriptomic analysis of melanoma patient samples treated with BRAFi + MEKi showed increased NR2F1. NR2F1 was highly expressed in the drug-tolerant invasive cell state of minimal residual disease in patient-derived and mouse-derived xenografts on BRAFi + MEKi. NR2F1 over-expression was sufficient …
Using Triple Oxygen Isotopes To Investigate Water Usage In Desert Ecosystems, Cloe V. Knutson
Using Triple Oxygen Isotopes To Investigate Water Usage In Desert Ecosystems, Cloe V. Knutson
Earth and Planetary Sciences ETDs
In arid environments, maintaining water balance can be more critical for survival than obtaining food. As droughts intensify, understanding how animals manage body water is essential. Triple oxygen isotope analysis provides a novel way to trace water sources in animals, distinguishing contributions from free water, food-derived oxygen, and atmospheric O2. We developed an equilibration method using CO2–H2O oxygen exchange and measured δ’18O and Δ’17O values via tunable infrared laser direct spectroscopy (TILDAS). Validated against traditional fluorination methods, this technique enables streamlined analysis of whole blood and plant samples. Applied to …
Addressing Head Injuries In High School Football: An Assessment Of Best Practices And Challenges In The Area Of Concussions As Held By New Mexico Activities Association High School Varsity Football Head Coaches And Athletic Directors, Alonzo Maestas
Health, Exercise, and Sports Sciences ETDs
Youth sports participation in the United States offers children and adolescents opportunities for physical activity, skill development, social interaction, and personal achievement. However, with sports comes the risk of injury, including concussions. Concussions can have serious long-term consequences such as chronic traumatic encephalopathy (CTE). In response to the risks of concussions, New Mexico enacted a concussion law, NM Stat 22-13-31. In addition to this law, the New Mexico Activities Association (NMAA) and National Federation of High School Associations (NFHS) have also given guidance on how to manage concussions.
However, there is a gap in the literature concerning concussion education, best …
Immune Regulation In Fungal Airway Inflammation And Host Defense, Ruoning Wang
Immune Regulation In Fungal Airway Inflammation And Host Defense, Ruoning Wang
Biomedical Sciences ETDs
Asthma is a chronic inflammatory disease of the lungs characterized by complex pathophysiological mechanisms and diverse endotypes, primarily categorized as T helper type 2 cell (Th2)-high and Th2-low asthma. Despite significant advances in understanding asthma pathogenesis, the mechanisms governing the pulmonary immune system’s response to external challenges have not been fully understood. To address these gaps, this comprehensive project was designed to investigate the interplay between fungal infections and specific CD4+ T cell populations in asthma. Our findings suggest that fungal infections can contribute to neutrophilic asthma by promoting the migration of platelet-myeloid aggregates into the lungs. We also …
Exploration, Expansion, And Optimization Of Bacteriophage Virus-Like Particle Vaccines, Andzoa N. Jamus
Exploration, Expansion, And Optimization Of Bacteriophage Virus-Like Particle Vaccines, Andzoa N. Jamus
Biomedical Sciences ETDs
Bacteriophage virus-like particles are highly immunogenic, self-assembling platforms used for various vaccines. This work shows efforts to explore new vaccine candidates against Chlamydia trachomatis, targeting proteins that play critical roles in attachment and entry into the host cell, as well as in pathogenesis and bacteria proliferation. This work also shows the optimization of previously identified candidates, by investigating how altering routes of immunization can change the antibody profiles elicited, both systemically and locally. Finally, this work shows the establishment of various Chlamydia infection models in an effort to expand the ways in which vaccine efficacy can be investigated, particularly …
Self-Initiated Action Rescues Visual Targets From Backwards Masking, Amber R. Hopkins, Tian Lan, Aaron Schurger
Self-Initiated Action Rescues Visual Targets From Backwards Masking, Amber R. Hopkins, Tian Lan, Aaron Schurger
Psychology Faculty Articles and Research
When a visual target is followed by a visual mask stimulus, the target sometimes goes unseen. This is visual masking. In an experiment treating a masked visual stimulus as the sensory outcome of self-initiated action, we demonstrate that self-initiated action can rescue visual targets from backwards masks. Specifically, participants were correct about a visual target more often when the target-mask sequence appeared after their self-initiated action than when its onset was triggered externally. While self-initiated action sometimes induces sensory attenuation, whereby the perception of sensory events that follow actions is dampened, we observed that self-initiated action promotes the perception of …
Nitrogen Addition Additively Boosts Climate-Driven Salsola Tragus (Russian Thistle) Invasion Into Southwestern Usa Grasslands, Melissa A. Bacigalupa
Nitrogen Addition Additively Boosts Climate-Driven Salsola Tragus (Russian Thistle) Invasion Into Southwestern Usa Grasslands, Melissa A. Bacigalupa
Biology ETDs
Effective management of invasive, non-native plants requires understanding key drivers of invasion, including nitrogen enrichment from atmospheric deposition and agriculture. Long-term studies are essential for capturing complex invasion dynamics yet remain uncommon. We used 22 years of observations and 14 years of nitrogen experiments to examine invasion by Salsola tragus (Russian thistle) into three semi-arid grasslands of central New Mexico. Invasion patterns varied, with rapid expansion in Chihuahuan Desert grassland and the Desert-Plains ecotone but stability in Plains grassland. Under ambient nitrogen, precipitation most strongly correlated with Russian thistle biomass and high native grass biomass was associated with Russian thistle …
Miniature Carnation Cut Flower Production In Utah, Kellie Webb, Melanie Stock, Benjamin Scow, Cheyenne Reid, Victoria Xiong, Claudia Nischwitz, Nick Volesky
Miniature Carnation Cut Flower Production In Utah, Kellie Webb, Melanie Stock, Benjamin Scow, Cheyenne Reid, Victoria Xiong, Claudia Nischwitz, Nick Volesky
All Current Publications
Carnation is one of the most popular cut flowers worldwide and has been grown for centuries. The delicate, fringed petals of miniature carnation have a spicy, clove-like scent and are often used commercially in potpourri and perfume. Florists value the scent, versatility in both large and small design work, long vase life, and broad range of colors, which include yellow, orange, pink, white, red, and purple. While traditionally grown under cover in regions like Colombia and Ecuador, carnation may be a viable cut flower for U.S. Intermountain West growers, as plants tolerate frost and grow well in both cool and …
Creating Sustainable School And Home Gardens: Companion Planting, Ruby Mohr, Kathy Cabe Trundle, Rita Hagevik
Creating Sustainable School And Home Gardens: Companion Planting, Ruby Mohr, Kathy Cabe Trundle, Rita Hagevik
All Current Publications
Companion planting is an agricultural practice in which two or more plants are intentionally grown together to enhance mutual productivity. The special relationships that plants have with other organisms help create balanced ecosystems. Companion planting can be used to reduce the need for chemical fertilizers and pesticides, increase yields, and attract beneficial insects such as pollinators.
Table Of Contents
Journal of the South Carolina Academy of Science
No abstract provided.
Effects Of Perfluorooctanoic Acid (Pfoa) And Elevated Salinity On Growth, Reproduction, And Movement Of Physa Acuta, Juana Baudrix, Andrea Rizzo, Samuel Richardson, Jason Doll, Daniel Elias
Effects Of Perfluorooctanoic Acid (Pfoa) And Elevated Salinity On Growth, Reproduction, And Movement Of Physa Acuta, Juana Baudrix, Andrea Rizzo, Samuel Richardson, Jason Doll, Daniel Elias
Journal of the South Carolina Academy of Science
Freshwater ecosystems face increasing threats from pollutants such as perfluorooctanoic acid (PFOA) and elevated salinity. This study examined the effects of PFOA (1.69 µg/L) and elevated salinity (2.5 g/L) on Physa acuta growth, reproduction, and movement over a 21-day exposure. Movement increased across treatments, and reproductive output also increased with salinity and salinity + PFOA, with increased egg sac production in the combined treatment (p < 0.05), while PFOA alone reduced total egg production. Growth was higher with PFOA but decreased in the salinity and salinity + PFOA treatments. Our results suggest that P. acuta increases reproductive output when exposed to combined stressors, prioritizing egg sac production at the cost of movement and growth. These trade-offs may influence P. acuta population dynamics and freshwater ecosystem processes. While this study provides insights into the effects of PFOA and salinity, further research is necessary to understand the long-term ecological consequences in field conditions.
07.28.2025 Ored Connect, Liz Williamson
07.28.2025 Ored Connect, Liz Williamson
ORED Newsletter
On-demand training courses released
- Mentoring
- My Project Was Funded, Now What?
Notice of Funding Opportunity SMART Act Accelerate Initiative
Memo Regarding Contact from Federal Agencies
Selenium Nanoparticles Synthesized By Pulsed Laser Ablation In Liquids For Antimicrobial Applications, Tina Hesabizadeh
Selenium Nanoparticles Synthesized By Pulsed Laser Ablation In Liquids For Antimicrobial Applications, Tina Hesabizadeh
Theses and Dissertations
This study aimed to synthesize selenium nanoparticles (Se NPs) by Pulsed Laser Ablation in Liquids (PLAL) and investigate their antibacterial and biological effects, particularly their impact on cell viability and related biological responses. Spherical amorphous Se NPs were produced by irradiating a selenium target using a combination of bottom- and top-ablation protocols. After autoclaving, the amorphous Se NPs were converted into trigonal Se NPs. Se NPs were characterized by using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Fourier Transform Infrared Spectroscopy (FTIR). The biological effects of Se NPs were quantitatively assessed through evaluations of cell viability and associated …
Characterization Of The Role Of Rsd-6, A Tudor Domain Protein, In Antiviral Rnai Pathway In Caenorhabditis Elegans, Krishna Prasad Dahal
Characterization Of The Role Of Rsd-6, A Tudor Domain Protein, In Antiviral Rnai Pathway In Caenorhabditis Elegans, Krishna Prasad Dahal
LSU Doctoral Dissertations
RNA interference (RNAi) triggered by virus produced dsRNA intermediate offers robust innate immunity against invading viruses in plants, insects and animals. Caenorhabditis elegans has been extensively used as a model organism to study host virus interaction. Recently, a forward genetic screen identified RNAi spreading deficient-6 (RSD-6), a Tudor domain protein, as a key component in antiviral RNAi pathway against Orsay virus in C. elegans but its contribution in the pathway remained unclear. Here, we generated a rsd-6 null allele using CRISPR-Cas9 genome editing, crossed it with other known RNAi mutants and analyzed Orsay virus replication in them and in combination …
Distributional Records Of Blanding’S Turtles (Emydoidea Blandingii) In Nebraska, Sam Thede, Dan Fogell, Keith Geluso
Distributional Records Of Blanding’S Turtles (Emydoidea Blandingii) In Nebraska, Sam Thede, Dan Fogell, Keith Geluso
Transactions of the Nebraska Academy of Sciences and Affiliated Societies
Blanding’s Turtle (Emydoidea blandingii) is a species of concern in North America as many populations have declined across its distribution. Environmental factors associated with alteration of natural ecosystems have played a role in declines leading to many isolated populations. Most populations exist in the Great Lakes region with a number of outlying populations, such as Nebraska. Understanding the current distribution of the species will facilitate regional management strategies to protect this species into the future. In Nebraska, Blanding’s Turtles were known from 23 counties prior to this study. Herein, we report on eight new county records, five (Blaine, …
Simulated Walleye Responses To Various Harvest Regulations In A Nebraska Reservoir, Mikael Ranta, Melissa Wuellner, Keith D. Koupal
Simulated Walleye Responses To Various Harvest Regulations In A Nebraska Reservoir, Mikael Ranta, Melissa Wuellner, Keith D. Koupal
Transactions of the Nebraska Academy of Sciences and Affiliated Societies
Recreational fishing provides sociological and economic benefits, and fish populations are managed by state agencies to meet angler expectations. One of the most popular species in Midwest reservoirs are walleye (Sander vitreus), and most of these fisheries have established restrictions on the number and sizes of fish harvested. Regulations are set based on population structure and dynamics and management goals, but often agencies have incomplete information needed to establish regulations. Predictive models can provide insight on population responses and inform managers of the tradeoffs between angler restrictions and population sustainability. Lake McConaughy, Nebraska, supports a popular walleye fishery. …
Cultural Worldview And Rural Consumer Preferences For Genetically Modified Foods, Nathan P. Kemper
Cultural Worldview And Rural Consumer Preferences For Genetically Modified Foods, Nathan P. Kemper
Agricultural Economics and Agribusiness Faculty Publications and Presentations
The consumer acceptance of genetically modified (GM) foods varies widely based on personal values and social context. This study investigates how cultural worldviews—measured through the Individualism–Communitarianism and Hierarchical–Egalitarianism dimensions—affect willingness to pay (WTP) for food labeling attributes related to GM content. We surveyed 932 U.S. primary grocery shoppers and conducted a discrete choice experiment (DCE) with poultry product options. Using a Mixed Logit model and supplemental cognitive data from Query Theory, we find that rural individualists are more accepting of GM-labeled products. At the same time, urban communitarians show a stronger preference for non-GM labels. These results offer insight into …
Immunocytochemistry Evaluation Of Fibroblast Response To Garlic (Allium Sativum) Extract Targeting Mmp9: In Vitro And In Silico Approaches, Sri Suciati Ningsih, Endah Zuraidah, Supri Irianti Handayani, Ahmad Ali Irfan Ardiansyah, Ningrum Wahyuni
Immunocytochemistry Evaluation Of Fibroblast Response To Garlic (Allium Sativum) Extract Targeting Mmp9: In Vitro And In Silico Approaches, Sri Suciati Ningsih, Endah Zuraidah, Supri Irianti Handayani, Ahmad Ali Irfan Ardiansyah, Ningrum Wahyuni
Indonesian Journal of Medical Chemistry and Bioinformatics
Background: Fibrosis involves excessive extracellular matrix (ECM) deposition, with matrix metalloproteinase-9 (MMP-9) playing a critical role. Natural compounds targeting MMP-9 may offer therapeutic potential. Objective: This study evaluated the antifibrotic effect of Allium sativum extract on fibroblast cells through in vitro and in silico approaches targeting MMP-9. Methods: Human dermal fibroblasts were treated with A. sativum extract (25, 50, and 100 µg/mL) for 24 and 48 hours. Cell viability was assessed using MTT assay. MMP-9 expression was analyzed via quantitative real-time PCR (qRT-PCR) and immunocytochemistry (ICC). Major garlic compounds were docked to MMP-9 using AutoDock Vina. Results: The 50 µg/mL …
Effects Of Mating System And Adaptedness On The Evolution Of Fitness And Mtdna Copy Number In Mitonuclear Mismatched C. Elegans, Zachary P. Dietz, Devshuvam Banerji, Jennifer A. Sullins, Brent W. Bever, Stephen F. Christy, Ulfar Bergthorsson, Vaishali Katju, Suzanne Estes
Effects Of Mating System And Adaptedness On The Evolution Of Fitness And Mtdna Copy Number In Mitonuclear Mismatched C. Elegans, Zachary P. Dietz, Devshuvam Banerji, Jennifer A. Sullins, Brent W. Bever, Stephen F. Christy, Ulfar Bergthorsson, Vaishali Katju, Suzanne Estes
Biology Faculty Publications and Presentations
Metabolic functioning in nearly all eukaryotes relies on molecular machinery dual-encoded by mitochondrial DNA (mtDNA) and nuclear DNA (nDNA) genomes. The two genomes have sustained an extraordinary degree of cooperation across evolutionary time, preserving the capacity for indispensable processes including oxidative phosphorylation and ATP production, which in turn influence many fitness-related traits. How this cooperation is maintained when one member of the pair is debilitated by deleterious mutation is poorly understood, as is the influence of mutation location (mtDNA or nDNA), mating system, or the potentially compensatory effects of mtDNA copy number changes on the process. We asked whether and …
Use Of Cholic Acid In Smith-Lemli-Opitz Syndrome (Slos): Real-World Patient Outcomes, Edwin Ferren, Paul R Hillman, Amy Kritzer, Joseph Ray, Alvaro Serrano, Hope Northrup, Paige Roberts, Rana Dutta, Tiziano Pramparo, Pamela Vig, Robert D Steiner
Use Of Cholic Acid In Smith-Lemli-Opitz Syndrome (Slos): Real-World Patient Outcomes, Edwin Ferren, Paul R Hillman, Amy Kritzer, Joseph Ray, Alvaro Serrano, Hope Northrup, Paige Roberts, Rana Dutta, Tiziano Pramparo, Pamela Vig, Robert D Steiner
Faculty, Staff and Student Publications
Background: Smith-Lemli-Opitz Syndrome (SLOS) is an autosomal recessive disorder of cholesterol biosynthesis caused by biallelic pathogenic variants in DHCR7, which encodes the enzyme 7-dehydrocholesterol reductase (DHCR7). SLOS is a multisystemic disorder affecting various aspects of health, including growth, development, behavior, and quality of life, underscoring the need for safe, efficacious interventions that limit disease burden. DHCR7 enzyme deficiency leads to a "metabolic block" resulting in decreased cholesterol production and accumulation of its precursor 7-dehydrocholesterol and the secondary isomer 8-dehydrocholesterol. Reduced cholesterol synthesis, in turn, leads to decreased levels of cholic acid (CA), an endogenous bile acid synthesized from cholesterol and …
Melanoma Antigens In Pediatric Medulloblastoma Contribute To Tumor Heterogeneity And Species-Specificity Of Group 3 Tumors, Rebecca R J Collins, Rebecca R Florke Gee, Sima Tozandehjani, Tara Bayat, Maria Camila Hoyos Sanchez, Juan Sebastian Solano Gutierrez, Barbara Breznik, Anna K Lee, Samuel T Peters, Jon P Connelly, Shondra M Pruett-Miller, Martine F Roussel, Dinesh Rakheja, Heather S Tillman, Patrick Ryan Potts, Klementina Fon Tacer
Melanoma Antigens In Pediatric Medulloblastoma Contribute To Tumor Heterogeneity And Species-Specificity Of Group 3 Tumors, Rebecca R J Collins, Rebecca R Florke Gee, Sima Tozandehjani, Tara Bayat, Maria Camila Hoyos Sanchez, Juan Sebastian Solano Gutierrez, Barbara Breznik, Anna K Lee, Samuel T Peters, Jon P Connelly, Shondra M Pruett-Miller, Martine F Roussel, Dinesh Rakheja, Heather S Tillman, Patrick Ryan Potts, Klementina Fon Tacer
Faculty, Staff and Student Publications
Medulloblastoma (MB) is the most malignant childhood brain cancer. Group 3 MB (G3 MB) subtype accounts for about 25% of MB and is associated with the worst outcomes. Herein, we report that more than half of G3 MB tumors express melanoma antigens (MAGEs), which are potential prognostic and therapeutic markers. MAGEs are cancer-testis antigens, aberrantly expressed in several adult cancers, and associated with poorer prognosis and therapy resistance; however, their role in pediatric cancers is mostly unknown. This study aimed to determine whether MAGEs are activated and important in pediatric MB. We obtained formalin-fixed paraffin-embedded tumor samples of 34 patients, …
A Novel Microdosimetry-Based Formalism For Cell Survival Modelling Applicable To Hypofractionated Radiotherapy, Oleg N Vassiliev, Radhe Mohan
A Novel Microdosimetry-Based Formalism For Cell Survival Modelling Applicable To Hypofractionated Radiotherapy, Oleg N Vassiliev, Radhe Mohan
Faculty, Staff and Student Publications
Objectives
Hypofractionated radiotherapy requires reliable cell survival models for doses much higher than the standard 2 Gy, for which the linear-quadratic (LQ) model is not applicable. We developed an alternative approach applicable to both low doses and high doses used in hypofractionated treatments and radiobiological experiments.
Approach.
We combined a standard microdosimetric technique with a recently introduced non-LQ cell survival model. Our formulation accounts for cell damage by multi-track events involving any number of particles. This is necessary for modelling cell survival at therapeutic doses. We characterise each cell type by the size �� of the sensitive volume (SV) and …
The Nature Of Anthropogenically Driven River Drying: Spatiotemporal Causes And Consequences, Eliza Inez Gilbert
The Nature Of Anthropogenically Driven River Drying: Spatiotemporal Causes And Consequences, Eliza Inez Gilbert
Biology ETDs
Streambed drying naturally occurs in over 60% of rivers and streams worldwide. Climate change and human regulation of surface and groundwater have increased drying in naturally intermittent systems and caused perennial systems to transition to intermittency, impacting water security, water quality, and biodiversity. To understand human-induced drying dynamics, we used 12 years of daily drying data along a 154-km regulated reach of the Rio Grande. We conceptualized river drying as a regime analogous to the natural flow regime paradigm and quantified drying magnitude, rate of change, and duration. Although linear models predicting drying magnitude and rate of change were uninterpretable, …
High Spatial Resolution Crop Type And Land Use Land Cover Classification Without Labels: A Framework Using Multi-Temporal Planetscope Images And Variational Bayesian Gaussian Mixture Model, Minh Tri Le
Mathematics, Physics, and Computer Science Faculty Articles and Research
Previous studies often combined high spatial resolution data (e.g., PlanetScope) with wider spectral range data (e.g., Sentinel-2) and relied on supervised classification methods to produce land use and land cover (LULC) maps. This study proposed a new unsupervised framework to generate crop type and LULC maps at high spatial resolution (< 5 m) using available PlanetScope data solely without requiring ground truths. We used PlanetScope surface reflectance images and their derived spectral indices during growing seasons to create multi-temporal input features, which were fed into an unsupervised Variational Bayesian Gaussian Mixture Model (VBGMM). The VBGMM, unlike the traditional unsupervised classification methods, (1) first estimated optimal parameters that are most suitable based on the input features and then (2) assigned pixels to the cluster with maximum posteriori probability of a mixture of several Gaussian distributions. The crop type and LULC maps were then generated by labeling the derived clusters using the best possible assignment method, referring to the existing crop type or LULC products. We evaluated the produced PlanetScope-based crop type and LULC maps using true labels, corresponding reference maps, and other unsupervised classification methods. The results demonstrated the robustness and effectiveness of the proposed framework in mapping crop types and LULC at 3–5 m pixels across various ecosystems, climate zones, and human-managed landscapes. The spatial patterns of PlanetScope-based maps were (1) highly comparable with all the reference datasets at 10–30 m spatial resolution and (2) better than the traditional GMM and K-means clustering methods. The VBGMM produced classification maps with high confidence, yielding class probabilities above 0.9 for over 90 % of all study areas. The area percentage for all crop type and LULC classes agreed well with their reference maps, with R2 of 0.95 and RMSE of 1.04 %. The confusion matrices using true labels indicated that PlanetScope-based maps achieved a higher overall accuracy of 84 % than the supervised referenced maps of 81 %. Besides, the entropy comparison showed that our framework-based maps were better at capturing fine-scale features such as developed areas within cities that commonly mix with open space and vegetation, deforestation and cropland conversion in South America, smallholder croplands in Africa and Asia, and generating homogeneous crop fields in North America. This study further highlighted the potential for future research to implement our proposed framework to generate timely and extensive annotated datasets, which can be used for operationally training machine learning models to map crop types and LULC, track deforestation, detect wildfires, and delineate flooded areas at larger scales using medium/coarse Earth observations.
Optimal Water Hammer Protection Strategies For Low-Head Hydraulic Systems: A Case Study Using Bentley Hammer, Ahmed A. Abdel-Naby, Mostafa A. Abdel-Moaty, Eslam R. Lotfy
Optimal Water Hammer Protection Strategies For Low-Head Hydraulic Systems: A Case Study Using Bentley Hammer, Ahmed A. Abdel-Naby, Mostafa A. Abdel-Moaty, Eslam R. Lotfy
Mansoura Engineering Journal
The analysis of water hammer in low-head hydraulic systems holds significant importance compared to that in high-head systems, particularly given instances where Thorley’s equation may fall short in providing accurate pump inertia values. In situations where manufacturer data are unavailable, proactive measures to mitigate potential hammering incidents become imperative. While Bentley HAMMER software provides robust simulation capabilities, optimal protection strategies for low-head systems remain underexplored. This case study focuses on a scenario involving multistage centrifugal pumps that lift water from the basement floor of a building to its roof via a polypropylene pipeline. The investigation revealed a novel configuration: relocating …
Spatial Patterning And Growth Of Naturally Regenerated Eastern White Pine In A Northern Hardwood Silviculture Experiment, David A. Kromholz, Christopher R. Webster, Mike Hyslop
Spatial Patterning And Growth Of Naturally Regenerated Eastern White Pine In A Northern Hardwood Silviculture Experiment, David A. Kromholz, Christopher R. Webster, Mike Hyslop
Michigan Tech Publications
In forests dominated by deciduous tree species, coniferous species are often disproportionately important because of their contrasting functional traits. Eastern white pine (Pinus strobus L.), once a widespread emergent canopy species, co-occurs with deciduous hardwoods in the northern Lake States, but is often uncommon in contemporary hardwood stands. To gain insights into the potential utility of hardwood management strategies for simultaneously regenerating white pine, we leveraged a northern hardwood silvicultural experiment with scattered overstory pine. Seven growing seasons post-harvest, we conducted a complete census of white pine regeneration (height ≥ 30 cm) and mapped their locations and the locations of …
Combination Of Irreversible Electroporation And Clostridium Novyi-Nt Bacterial Therapy For Colorectal Liver Metastasis, Zigeng Zhang, Guangbo Yu, Qiaoming Hou, Farideh Amirrad, Sha Webster, Surya M. Nauli, Jianhua Yu, Vahid Yaghmai, Aydin Eresen, Zhuoli Zhang
Combination Of Irreversible Electroporation And Clostridium Novyi-Nt Bacterial Therapy For Colorectal Liver Metastasis, Zigeng Zhang, Guangbo Yu, Qiaoming Hou, Farideh Amirrad, Sha Webster, Surya M. Nauli, Jianhua Yu, Vahid Yaghmai, Aydin Eresen, Zhuoli Zhang
Pharmacy Faculty Articles and Research
Colorectal liver metastasis (CRLM) poses a significant challenge in oncology due to its high incidence and poor prognosis in unresectable cases. Current treatments, including surgical resection, systemic chemotherapy, and liver-directed therapies, often fail to effectively target hypoxic tumor regions, which are inherently more resistant to these interventions. This review examines the potential of a novel therapeutic strategy combining irreversible electroporation (IRE) ablation and Clostridium novyi-nontoxic (C. novyi-NT) bacterial therapy. IRE is a non-thermal tumor ablation technique that uses high-voltage electric pulses to create permanent nanopores in cell membranes, leading to cell death while preserving surrounding structures, and …