Now showing items 1-20 of 221

    • Apportioned primary and secondary organic aerosol during pollution events of DISCOVER-AQ Houston 

      Yoon, Subin; Ortiz, Stephanie M.; Clark, Adelaide E.; Barrett, Tate E.; Usenko, Sascha; (2021)
      Understanding the drivers for high ozone (O3) and atmospheric particulate matter (PM) concentrations is a pressing issue in urban air quality, as this understanding informs decisions for control and mitigation of these key pollutants. The Houston, TX metropolitan area is an ideal location for studying the intersection between O3 and atmospheric ...
    • Hierarchical Assemblies of Superparamagnetic Colloids in Time-Varying Magnetic Fields 

      Spatafora-Salazar, Ald; Lobmeyer, Dana; da Cunha, Lucas Hildebrand Pires; Joshi, Kedar; Biswal, Sibani Lisa (2021)
      Magnetically-guided colloidal assembly has proven to be a versatile method for building hierarchical particle assemblies. This review describes the dipolar interactions that govern superparamagnetic colloids in time-varying magnetic fields, and how such interactions have guided colloidal assembly into materials with increasing complexity that display ...
    • Discrete-state stochastic kinetic models for target DNA search by proteins: Theory and experimental applications 

      Iwahara, Junji; Kolomeisky, Anatoly B.; Center for Theoretical Biological Physics (2021)
      To perform their functions, transcription factors and DNA-repair/modifying enzymes randomly search DNA in order to locate their specific targets on DNA. Discrete-state stochastic kinetic models have been developed to explain how the efficiency of the search process is influenced by the molecular properties of proteins and DNA as well as by other ...
    • Highly efficient photoelectric effect in halide perovskites for regenerative electron sources 

      Liu, Fangze; Sidhik, Siraj; Hoffbauer, Mark A.; Lewis, Sina; Neukirch, Amanda J.; (2021)
      Electron sources are a critical component in a wide range of applications such as electron-beam accelerator facilities, photomultipliers, and image intensifiers for night vision. We report efficient, regenerative and low-cost electron sources based on solution-processed halide perovskites thin films when they are excited with light with energy equal ...
    • Simulation of potential formation of atmospheric pollution from aboveground storage tank leakage after severe storms 

      Bi, Shiyang; Kiaghadi, Amin; Schulze, Benjamin C.; Bernier, Carl; Bedient, Philip B.; (2021)
      Damage by severe storms of infrastructure containing chemicals can cause widespread pollution of the atmosphere and nearby bodies of water. Because atmospheric monitoring equipment is inoperable in the periods after these storms, transport and fate modeling approaches are necessary to estimate the regional atmospheric concentrations of evaporated ...
    • Transformation of One-Dimensional Linear Polymers into Two-Dimensional Covalent Organic Frameworks Through Sequential Reversible and Irreversible Chemistries 

      Zhu, Dongyang; Li, Xiaoyi; Li, Yilin; Barnes, Morgan; Tseng, Chia-Ping; (2021)
      Covalent organic frameworks (COFs) are crystalline porous materials linked by dynamic covalent bonds. Dynamic chemistries enable the transformation of an initially amorphous network into a porous and crystalline COF. While dynamic chemistries have been leveraged to realize transformations between different types of COFs, including transformations ...
    • Translating New Synthetic Biology Advances for Biosensing Into the Earth and Environmental Sciences 

      Del Valle, Ilenne; Fulk, Emily M.; Kalvapalle, Prashant; Silberg, Jonathan J.; Masiello, Caroline A.; (2021)
      The rapid diversification of synthetic biology tools holds promise in making some classically hard-to-solve environmental problems tractable. Here we review longstanding problems in the Earth and environmental sciences that could be addressed using engineered microbes as micron-scale sensors (biosensors). Biosensors can offer new perspectives on open ...
    • A zero-dimensional view of atmospheric degradation of levoglucosan (LEVCHEM_v1) using numerical chamber simulations 

      Suciu, Loredana G.; Griffin, Robert J.; Masiello, Caroline A. (2021)
      Here, we developed a zero-dimensional (0-D) modeling framework (LEVCHEM_v1) to provide insights into the atmospheric degradation of a key tracer emitted during biomass burning – levoglucosan (LEV), while additionally exploring its effects on the dynamics of secondary organic aerosols (SOA) and other gases. For this, we updated existing chemical ...
    • DNA Looping and DNA Conformational Fluctuations Can Accelerate Protein Target Search 

      Felipe, Cayke; Shin, Jaeoh; Kolomeisky, Anatoly B.; Center for Theoretical Biological Physics (2021)
      Protein searching and binding to specific sites on DNA is a fundamentally important process that marks the beginning of all major cellular transformations. While the dynamics of protein–DNA interactions in in vitro settings is well investigated, the situation is much more complex for in vivo conditions because the DNA molecules in live cells are ...
    • Heavy oil viscosity reduction at mild temperatures using palladium acetylacetonate 

      Xu, Yan; Heck, Kimberly N.; Ayala-Orozco, Ciceron; Arredondo, Jacob H.; Zenor, William; (2021)
      Metal-ligand compounds (“MLCs”) have been shown to reduce heavy oil viscosity and upgrade oil quality. However, MLCs generally require high treatment temperatures (around 250 °C), which is undesirably energy-intensive. We identified palladium(II) acetylacetonate (“PdA”) as a model MLC that can operate at mild temperatures (<200 °C). We studied its ...
    • Theoretical Analysis Reveals the Cost and Benefit of Proofreading in Coronavirus Genome Replication 

      Mallory, Joel D.; Mallory, Xian F.; Kolomeisky, Anatoly B.; Igoshin, Oleg A.; Center for Theoretical Biological Physics (2021)
      Severe acute respiratory syndrome coronaviruses have unusually large RNA genomes replicated by a multiprotein complex containing an RNA-dependent RNA polymerase (RdRp). Exonuclease activity enables the RdRp complex to remove wrongly incorporated bases via proofreading, a process not utilized by other RNA viruses. However, it is unclear why the RdRp ...
    • High‐performance hybrid luminescent‐scattering solar concentrators based on a luminescent conjugated polymer 

      Li, Yilin; Sun, Yujian; Zhang, Yongcao; Li, Yuxin; Verduzco, Rafael (2021)
      Luminescent solar concentrators (LSCs) are considered a promising building‐integrated photovoltaic technology. Over the past decade, numerous luminophores have been developed for LSCs. However, conjugated polymers are rarely reported for LSCs despite their wide application in other fields. In this study, we investigated a luminescent conjugated ...
    • Side‐Chain Engineering for High‐Performance Conjugated Polymer Batteries 

      Li, Xiaoyi; Li, Yilin; Sarang, Kasturi; Lutkenhaus, Jodie; Verduzco, Rafael (2021)
      Conjugated polymers are attractive for energy storage but typically require significant amounts of conductive additives to successfully operate with thin electrodes. Here, side‐chain engineering is used to improve the electrochemical performance of conjugated polymer electrodes. Naphthalene dicarboximide (NDI)‐based conjugated polymers with ion‐conducting ...
    • Distinguishing the Effect of Rock Wettability from Residual Oil on Foam Generation and Propagation in Porous Media 

      Amirmoshiri, Mohammadreza; Wang, Xinglin; Bai, Chutian; Tewari, Raj Deo; Xie, Sheena Xina; (2021)
      One of the common challenges of applying foam for enhanced oil recovery is the foam instability in the presence of crude oil and nonwater-wet surfaces. In this experimental study, we systematically distinguish the effect of rock surface wettability from that of crude oil saturation on foam rheology under reservoir conditions. Neutral-wet Berea and ...
    • A platform for post-translational spatiotemporal control of cellular proteins 

      Jayanthi, Brianna; Bachhav, Bhagyashree; Wan, Zengyi; Martinez Legaspi, Santiago; Segatori, Laura; (2021)
      Mammalian cells process information through coordinated spatiotemporal regulation of proteins. Engineering cellular networks thus relies on efficient tools for regulating protein levels in specific subcellular compartments. To address the need to manipulate the extent and dynamics of protein localization, we developed a platform technology for the ...
    • Single-Particle Hyperspectral Imaging Reveals Kinetics of Silver Ion Leaching from Alloy Nanoparticles 

      Al-Zubeidi, Alexander; Stein, Frederic; Flatebo, Charlotte; Rehbock, Christoph; Hosseini Jebeli, Seyyed Ali; (2021)
      Gold–silver alloy nanoparticles are interesting for multiple applications, including heterogeneous catalysis, optical sensing, and antimicrobial properties. The inert element gold acts as a stabilizer for silver to prevent particle corrosion, or conversely, to control the release kinetics of antimicrobial silver ions for long-term efficiency at minimum ...
    • Long-Range Supercoiling-Mediated RNA Polymerase Cooperation in Transcription 

      Klindziuk, Alena; Kolomeisky, Anatoly B.; Center for Theoretical Biological Physics (2021)
      It is widely believed that DNA supercoiling plays an important role in the regulation of transcriptional dynamics. Recent studies show that it could affect transcription not only through the buildup and relaxation of torsional strain on DNA strands but also via effective long-range supercoiling-mediated interactions between RNA polymerase (RNAP) ...
    • Electrochemical ammonia synthesis via nitrate reduction on Fe single atom catalyst 

      Wu, Zhen-Yu; Karamad, Mohammadreza; Yong, Xue; Huang, Qizheng; Cullen, David A.; (2021)
      Electrochemically converting nitrate, a widespread water pollutant, back to valuable ammonia is a green and delocalized route for ammonia synthesis, and can be an appealing and supplementary alternative to the Haber-Bosch process. However, as there are other nitrate reduction pathways present, selectively guiding the reaction pathway towards ammonia ...
    • Rapid, Ambient Temperature Synthesis of Imine Covalent Organic Frameworks Catalyzed by Transition-Metal Nitrates 

      Zhu, Dongyang; Zhang, Zhuqing; Alemany, Lawrence B.; Li, Yilin; Nnorom, Njideka; (2021)
      Covalent organic frameworks (COFs) are crystalline, porous organic materials that are promising for applications including catalysis, energy storage, electronics, gas storage, water treatment, and drug delivery. Conventional solvothermal synthesis approaches require elevated temperatures, inert environments, and long reaction times. Herein, we show ...
    • Highly active and selective oxygen reduction to H2O2 on boron-doped carbon for high production rates 

      Xia, Yang; Zhao, Xunhua; Xia, Chuan; Wu, Zhen-Yu; Zhu, Peng; (2021)
      Oxygen reduction reaction towards hydrogen peroxide (H2O2) provides a green alternative route for H2O2 production, but it lacks efficient catalysts to achieve high selectivity and activity simultaneously under industrial-relevant production rates. Here we report a boron-doped carbon (B-C) catalyst which can overcome this activity-selectivity dilemma. ...