Now showing items 2179-2198 of 5065

    • La Niña-driven flooding in the Indo-Pacific warm pool during the past millennium 

      Rodysill, Jessica R.; Russell, James M.; Vuille, Mathias; Dee, Sylvia; Lunghino, Brent; (2019)
      Extreme precipitation events are one of the most consequential components of climate change for society. The El Niño-Southern Oscillation (ENSO) is the dominant mode of precipitation variability in the tropics and causes severe flooding and drought in many socioeconomically vulnerable regions. It remains unclear how tropical rainfall extremes and ...
    • Label-free as-grown double wall carbon nanotubes bundles for Salmonella typhimurium immunoassay 

      Punbusayakul, Niramol; Talapatra, Saikat; Ajayan, Pulickel M; Surareungchai, Werasak (2013)
      Background: A label-free immunosensor from as-grown double wall carbon nanotubes (DW) bundles was developed for detecting Salmonella typhimurium. The immunosensor was fabricated by using the as-grown DW bundles as an electrode material with an anti-Salmonella impregnated on the surface. The immunosensor was electrochemically characterized by cyclic ...
    • Labeling Stem Cells with a New Hybrid Bismuth/Carbon Nanotube Contrast Agent for X-Ray Imaging 

      Hernández-Rivera, Mayra; Cho, Stephen Y.; Moghaddam, Sakineh E.; Cheong, Benjamin Y.; Cabreira-Hansen, Maria da Graça; (2019)
      The poor retention and survival of cells after transplantation to solid tissue represent a major obstacle for the effectiveness of stem cell-based therapies. The ability to track stem cells in vivo can lead to a better understanding of the biodistribution of transplanted cells, in addition to improving the analysis of stem cell therapies’ outcomes. ...
    • Laboratory investigation of co-precipitation of CaCO3/BaCO3 mineral scale solids at oilfield operating conditions: Impact of brine chemistry 

      Zhang, Zhang; Kan, Amy T.; Tomson, Mason B.; Zhang, Ping (2020)
      Oilfield mineral scale deposition can become severe flow assurance challenge especially for offshore deepwater productions. Hazards arising from scale formation and subsequent deposition include production system throughput reduction and eventually blockage. Among various types of scales, carbonates are among the most frequently observed scales in ...
    • Lactose repressor hinge domain independently binds DNA 

      Xu, Joseph S.; Hewitt, Madeleine N.; Gulati, Jaskeerat S.; Cruz, Matthew A.; Zhan, Hongli; (2018)
      The short 8–10 amino acid “hinge” sequence in lactose repressor (LacI), present in other LacI/GalR family members, links DNA and inducer‐binding domains. Structural studies of full‐length or truncated LacI‐operator DNA complexes demonstrate insertion of the dimeric helical “hinge” structure at the center of the operator sequence. This association ...
    • Lagged and dormant season climate better predict plant vital rates than climate during the growing season 

      Evers, Sanne M.; Knight, Tiffany M.; Inouye, David W.; Miller, Tom E. X.; Salguero‐Gómez, Roberto; (2021)
      Understanding the effects of climate on the vital rates (e.g., survival, development, reproduction) and dynamics of natural populations is a long-standing quest in ecology, with ever-increasing relevance in the face of climate change. However, linking climate drivers to demographic processes requires identifying the appropriate time windows during ...
    • Lamellar and liquid crystal ordering in solvent-annealed all-conjugated block copolymers 

      (2014)
      All-conjugated block copolymers are an emerging class of polymeric materials promising for organic electronic applications, but further progress requires a better understanding of their microstructure including crystallinity and self-assembly through micro-phase segregation. Here, we demonstrate remarkable changes in the thin film structure of a model ...
    • Laminin Peptide-Immobilized Hydrogels Modulate Valve Endothelial Cell Hemostatic Regulation 

      (2015)
      Valve endothelial cells (VEC) have unique phenotypic responses relative to other types of vascular endothelial cells and have highly sensitive hemostatic functions affected by changes in valve tissues. Furthermore, effects of environmental factors on VEC hemostatic function has not been characterized. This work used a poly(ethylene glycol) diacrylate ...
    • Land Use and Land Cover Shape River Water Quality at a Continental Caribbean Land-Ocean Interface 

      Clark, Kasey E.; Bravo, Viviana D.; Giddings, Sarah N.; Davis, Kristen A.; Pawlak, Geno; (2022)
      Land use and land cover (LULC) can significantly alter river water, which can in turn have important impacts on downstream coastal ecosystems by delivering nutrients that promote marine eutrophication and hypoxia. Well-documented in temperate systems, less is known about the way land cover relates to water quality in low-lying coastal zones in the ...
    • Land, Race, and Citizenship: The Political Spaces of Monumentalism in South Africa 

      Emden, Christian J. (2013)
      This essay discusses the nature of (old and new) national monuments in post-apartheid South Africa which even now, twenty years after the first free elections, remains a democracy in transition. The discourse of monumentalism in transitional political systems is marked by concrete political interests that, in the case of South Africa, are centered ...
    • Landau Collision Integral Solver with Adaptive Mesh Refinement on Emerging Architectures 

      Adams, Mark F.; Hirvijoki, Eero; Knepley, Matthew G.; Brown, Jed; Isaac, Tobin; (2017)
      The Landau collision integral is an accurate model for the small-angle dominated Coulomb collisions in fusion plasmas. We investigate a high order accurate, fully conservative, finite element discretization of the nonlinear multispecies Landau integral with adaptive mesh refinement using the PETSc library (ŭlwww.mcs.anl.gov/petsc). We develop algorithms ...
    • Landau level crossing in a spin-orbit coupled two-dimensional electron gas 

      Wu, Xing-Jun; Li, Ting-Xin; Zhang, Chi; Du, Rui-Rui (2015)
      We have studied experimentally theᅠLandau levelᅠ(LL) spectrum of a two-dimensionalᅠelectron gasᅠ(2DEG)ᅠin an In0.53Ga0.47As/InPᅠquantum wellᅠstructure by means of low-temperature magneto-transport coincidence measurement in vectorᅠmagnetic fields.ᅠIt is well known that LL crossing occurs in tiltedᅠmagnetic fieldsᅠdue to a competition between cyclotron ...
    • Large enhanced dielectric permittivity in polyaniline passivated core-shell nano magnetic iron oxide by plasma polymerization 

      (2014)
      Commercial samples of Magnetite with size ranging from 25-30nm were coated with polyaniline by using radio frequency plasma polymerization to achieve a core shell structure of magnetic nanoparticle (core)-Polyaniline (shell). High resolution transmission electron microscopy images confirm the core shell architecture of polyaniline coated iron oxide. ...
    • Large-amplitude electric fields in the inner magnetosphere: Van Allen Probes observations of subauroral polarization streams 

      Califf, S.; Li, X.; Wolf, R.A.; Zhao, H.; Jaynes, A.N.; (2016)
      The subauroral polarization stream (SAPS) is an important magnetosphere-ionosphere (MI) coupling phenomenon that impacts a range of particle populations in the inner magnetosphere. SAPS studies often emphasize ionospheric signatures of fast westward flows, but the equatorial magnetosphere is also affected through strong radial electric fields in the ...
    • Large-Amplitude Variations in Carbon Cycling and Terrestrial Weathering during the Latest Paleocene and Earliest Eocene: The Record at Mead Stream, New Zealand 

      Slotnick, Benjamin S.; Dickens, Gerald R.; Nicolo, Micah J.; Hollis, Christopher J.; Crampton, James S.; (2012)
      The late Paleocene to early Eocene was marked by major changes in Earth surface temperature and carbon cycling. This included at least two, and probably more, geologically brief (<200-k.yr.) intervals of extreme warming, the Paleocene-Eocene thermal maximum (PETM) and the Eocene thermal maximum-2 (ETM-2). The long-term rise in warmth and short-term ...
    • Large-scale current systems and ground magnetic disturbance during deep substorm injections 

      (2012)
      We present a detailed analysis of the large-scale current systems and their effects on the ground magnetic field disturbance for an idealized substorm event simulated with the equilibrium version of the Rice Convection Model. The objective of this study is to evaluate how well the bubble-injection picture can account for some classic features of ...
    • Large-Scale Structure-Based Prediction of Stable Peptide Binding to Class I HLAs Using Random Forests 

      Abella, Jayvee R.; Antunes, Dinler A.; Clementi, Cecilia; Kavraki, Lydia E.; Center for Theoretical Biological Physics (2020)
      Prediction of stable peptide binding to Class I HLAs is an important component for designing immunotherapies. While the best performing predictors are based on machine learning algorithms trained on peptide-HLA (pHLA) sequences, the use of structure for training predictors deserves further exploration. Given enough pHLA structures, a predictor based ...
    • Large-Scale Structure-Based Screening of Potential T Cell Cross-Reactivities Involving Peptide-Targets From BCG Vaccine and SARS-CoV-2 

      Tarabini, Renata Fioravanti; Rigo, Mauricio Menegatti; Faustino Fonseca, André; Rubin, Felipe; Bellé, Rafael; (2022)
      Although not being the first viral pandemic to affect humankind, we are now for the first time faced with a pandemic caused by a coronavirus. The Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) has been responsible for the COVID-19 pandemic, which caused more than 4.5 million deaths worldwide. Despite unprecedented efforts, with vaccines ...
    • Large-scale tectonic cycles in Europe revealed by distinct Pb isotope provinces 

      Blichert-Toft, Janne; Delile, Hugo; Lee, Cin-Ty; Stos-Gale, Zofia; Billstrӧm, Kjell; (2016)
      Lead isotopic systematics of U-poor minerals, such as sulfides and feldspars, can provide unique insights into the origin and evolution of continents because these minerals “freeze in” the Pb isotopic composition of the crust during major tectonothermal events, allowing the history of a continent to be told through Pb isotopes. Lead model ages constrain ...
    • Laser Pulse Duration Is Critical For the Generation of Plasmonic Nanobubbles 

      (2014)
      Plasmonic nanobubbles (PNBs) are transient vapor nanobubbles generated in liquid around laser-overheated plasmonic nanoparticles. Unlike plasmonic nanoparticles, PNBs’ properties are still largely unknown due to their highly nonstationary nature. Here we show the influence of the duration of the optical excitation on the energy efficacy and threshold ...