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open access

High pressure-derived nonsymmetrical [Cu2O]2+ core for room-temperature methane hydroxylation

Description: The authors of the article report the high-pressure synthesis of a metastable nonsymmetrical dicopper-μ-oxo compound with exceptional reactivity toward the mono-oxygenation of aliphatic C─H bonds. The nonequivalent coordination environment of copper stabilizes localized mixed valency and greatly enhances the hydrogen atom abstraction activity of the bridging oxygen, enabling room-temperature hydroxylation of methane under pressure. These findings highlight the role of dissymmetry in the reactiv… more
Date: October 4, 2024
Creator: VanNatta, Peter E.; Archambault, Cynthia M.; Wang, Sicheng; Lyu, Tengteng; D'Amelio, Jack; Martell, Noah J. et al.
Partner: UNT College of Science
open access

Rapid, high-capacity adsorption of iodine from aqueous environments with amide functionalized covalent organic frameworks

Description: This article asserts that the uses and production of radionuclides in nuclear energy production and medical therapy are becoming more significant in today's world. While these applications have many benefits, they can produce harmful pollutants, such as radioactive iodine, that need to be sequestered. The authors report the highly efficient capture of iodine in a series of mesoporous, two-dimensional (2D) covalent organic frameworks, called COFamides, which contain amide sidechains in their por… more
Date: January 24, 2024
Creator: Arora, Niyati; Debnath, Tanay; Senarathna, Milinda C.; Johnson, Rebecca M.; Roske, Isabella G.; Cisneros, Gerardo Andrés et al.
Partner: UNT College of Science
open access

Experimental and computational studies of the kinetics of the reaction of hydrogen peroxide with the amidogen radical

Description: In this article the pulsed-laser photolysis/laser-induced fluorescence method is used to study the kinetics of the reaction of NH2 with H2O2 to yield a second-order rate constant of (2.42 ± 0.55) × 10−14 cm3 molecule−1 s−1 at 412 K in 10–22 mbar of Ar bath gas. To check this value and enable reliable extrapolation to other temperatures, the authors also compute thermal rate constants for this process over the temperature range 298–3000 K via multi-structural canonical variational transition-sta… more
Date: July 1, 2022
Creator: Alecu, I. M.; Gao, Yide & Marshall, Paul
Partner: UNT College of Science
open access

Challenges in Kinetic modeling of ammonia pyrolysis

Description: This article discusses how ammonia pyrolysis reactions have implications for its ignition and oxidation in engines and gas turbines. In the present work, the chemistry of ammonia pyrolysis is investigated by kinetic modeling and theory. The chemical kinetic model is validated against reported shock tube measurements of NH3, NH2, and NH in ammonia pyrolysis.
Date: January 17, 2022
Creator: Glarbourg, Peter; Hashemi, Hamid & Marshall, Paul
Partner: UNT College of Science
open access

CAREER: Organic and inorganic carbon metabolism in methanotrophic bacteria

Description: Data management plan for the grant, "CAREER: Organic and inorganic carbon metabolism in methanotrophic bacteria." Evidence shows that the methanotroph Methylococcus capsulatus can uniquely co-utilize CH4 and CO2 as carbon sources, but the underlying metabolism and its regulation is incompletely understood. This project will leverage recently developed methanotroph genetic tools and high throughput CRISPR interference (CRISPRi) functional genetic techniques to further define the role of CO2 and … more
Date: 2025-02-01/2030-01-31
Creator: Henard, Calvin
Partner: UNT College of Science
open access

The rare Fuegian fox (Lycalopex culpaeus) from the Tierra del Fuego Archipelago: history of discovery, geographic distribution, and socioecological aspects

Description: This article describes the discovery, geographic distribution, and socioecological aspects of the Fuegian fox (Lycalopex culpaeus). The authors provide new distributional records and unpublished photographs of the Fuegian fox.
Date: January 17, 2024
Creator: Jaksić, F. M. (Fabian M.), 1952-; Zurita, Carlos; Briceño, Cristóbal & Jiménez, Jaime E.
Partner: UNT College of Science
open access

Overexpression of native carbonic anhydrases increases carbon conversion efficiency in the methanotrophic biocatalyst Methylococcus capsulatus Bath

Description: In this article authors show that M. capsulatus expresses five carbonic anhydrase (CA) isoforms, one α-CA, one γ-CA, and three β-CAs, that play a role in its inorganic carbon metabolism and CO2-dependent growth. The authors developed an engineered methanotrophic biocatalyst overexpressing the native α-CA and β-CA with a 2.5-fold improvement in the conversion of CH4 to biomass.
Date: August 27, 2024
Creator: Lee, Spencer A.; Henard, Jessica M.; Alba, Robyn A. C.; Benedict, Chance A.; Mayes, Tyler A. & Henard, Calvin
Partner: UNT College of Science
open access

Construction of a broad-host-range Anderson promoter series and particulate methane monoxygenase promoter variants expand the methanotroph genetic toolbox

Description: This article determined the copy number of three broad-host-range plasmids in Methylococcus capsulatus Bath and Methylosinus trichosporium OB3b, representing phylogenetically diverse Gammaproteobacterial and Alphaproteobacterial methanotrophs, respectively. The authors mutagenized the native M. Capsulatus particulate methane monooxygenase promoter and identified variants with activity that expand the activity range of synthetic, constitutive promotors functional not only in M. capsulatus, but a… more
Date: February 28, 2024
Creator: Bhat, Etash H.; Henard, Jessica M.; Lee, Spencer A.; McHalffey, Dustin; Ravulapati, Mahith S.; Rogers, Elle V. et al.
Partner: UNT College of Science
open access

Metal-Organic Frameworks Housing Active Molecules as Bioinspired Catalysts

Description: This article asserts that the development of synthetic heterogeneous catalyst analogs, which may not only mimic enzymes to reproduce or even surpass their performance but also bypass their intrinsic limitations, is thus, desirable and has been extensively studied in the context of porous materials. The authors summarize the last 5 years of progress exploiting MOFs housing active molecules for substantial catalysis applications, including asymmetric reactions, CO2 conversion (reduction, cycloadd… more
Date: June 3, 2024
Creator: Zhang, Yin; VanNatta, Peter E.; Ren, Junyu & Ma, Shengqian
Partner: UNT College of Science
open access

Effect of Irrigation Water Quality and Soil Compost Treatment on Salinity Management to Improve Soil Health and Plant Yield

Description: This article asserts that increasing soil salinity and degraded irrigation water quality are major challenges for agriculture. This study investigated the effects of irrigation water quality and incorporating compost on minimizing soil salinization and promoting sustainable cropping systems.
Date: May 13, 2024
Creator: Suvendran, Subansky; Johnson, David E.; Acevedo, Miguel F.; Smithers, Breana & Xu, Pei
Partner: UNT College of Science
open access

Creation of Cationic Polymeric Nanotrap Featuring High Anion Density and Exceptional Alkaline Stability fro Highly Efficient Pertechnetate Removal from Nuclear Waste Streams

Description: This article states that there is an urgent need for highly efficient sorbents capable of selectively removing 99TcO4– from concentrated alkaline nuclear wastes, which has long been a significant challenge. In this study, the authors present the design and synthesis of a high-performance adsorbent, CPN-3 (CPN denotes cationic polymeric nanotrap), which achieves excellent 99TcO4– capture under strong alkaline conditions by incorporating branched alkyl chains on the N3 position of imidazolium uni… more
Date: January 31, 2024
Creator: Wang, Bin; Li, Jie; Huang, Hongliang; Liang, Bin; Zhang, Yin; Chen, Long et al.
Partner: UNT College of Science

Contribution of terpenoids to systemic acquired resistance in plants

Description: In this poster the authors hypothesize that dehydroabietinal synthesized in the roots of plants is translocated to the shoots where it is engaged as a signaling metabolite in SAR and for flowering time. It was presented at the UNT Research Day on October 4, 2024 in Denton, Texas.
Date: October 4, 2024
Creator: Alatoum, Mohammad & Shah, Jyoti
Partner: UNT College of Science
open access

X-ray properties of reverberation-mapped AGNs with super-Eddington accreting massive black holes

Description: This article identifies eight reverberation-mapped AGNs with some of the largest known accretion rates without high-quality X-ray data. The authors obtained new Chandra ACIS-S X-ray observations and nearly simultaneous optical spectrophotometry to investigate the properties of these AGNs with extreme super-Eddington accreting massive black holes.
Date: January 11, 2024
Creator: Maithil, Jaya; Brotherton, Michael S.; Shemmer, Ohad; Luo, Bin; Du, Pu; Wang, Jian-Min et al.
Partner: UNT College of Science
open access

Theoretical Prediction of Core-Level Binding Energies: Analysis of Unexpected Errors

Description: This article is an analysis of the C(1s) and O(1s) core-level binding energies (CLBEs) of selected molecules computed by means of total energy Hartree-Fock (ΔSCF-HF) differences shows that in some cases, the calculated values for the C(1s) are larger than the experiment, which is unexpected.
Date: January 25, 2024
Creator: Sousa, Carmen; Bagus, Paul S. & Illas, Francesc
Partner: UNT College of Science
open access

Approaching Electroencephalographic Pathological Spikes in Terms of Solitons

Description: This article hypothesize that some of the electric oscillations detectable by scalp electroencephalography could be assessed in terms of solitons. The authors argue that solitons bear striking similarities with the electric activity recorded from medical conditions like epilepsies and encephalopathies.
Date: May 1, 2024
Creator: Tozzi, Arturo
Partner: UNT College of Science
open access

PUFchain 3.0: Hardware-Assisted Distributed Ledger for Robust Authentication in Healthcare Cyber-Physical Systems

Description: This article presents a novel hardware-assisted distributed ledger-based solution for simultaneous device and data security in smart healthcare. The authors' experimental analysis shows that the proposed approach successfully integrates three security primitives, PUF, blockchain, and Tangle, providing decentralized access control and security in H-CPS with minimal energy requirements, data storage, and response time.
Date: January 31, 2024
Creator: Bathalapalli, Venkata K. V. V.; Mohanty, Saraju P.; Kougianos, Elias; Iyer, Vasanth & Rout, Bibhudutta
Partner: UNT College of Science
open access

Combinatorial biosynthesis for the engineering of novel fungal natural products

Description: This article reviews different approaches for combinatorial biosynthesis of natural products via engineering fungal enzymes and biosynthetic pathways. The authors highlight the biosynthetic knowledge gained from these studies and provide examples of new-to-nature bioactive molecules, including molecules synthesized suing combinations of fungal and non-fungal enzymes.
Date: April 18, 2024
Creator: Skellam, Elizabeth; Rajendran, Sanjeevan & Li, Lei
Partner: UNT College of Science
open access

Complexity synchronization in emergent intelligence

Description: The authors of this article use a simple multi-agent-based-model (MABM) of a social network, implementing selfish algorithm agents, to create an adaptive environment and show, using a modified diffusion entropy analysis (DEA), that the mutual-adaptive interaction between the parts of such a network manifests complexity synchronization. The authors find the same kind of complexity synchronization in the emergent intelligence of groups formed in a self-organized social interaction without macrosc… more
Date: March 21, 2024
Creator: Mahmoodi, Korosh; Kerick, Scott E.; Franaszczuk, Piotr J.; Parsons, Thomas D.; Grigolini, Paolo & West, Bruce J.
Partner: UNT College of Science
open access

Shell shape does not accurately predict self-righting ability in hatchling freshwater turtles

Description: This article examines hatchling self-righting performance in three morphologically distinct freshwater turtle species that inhabit similar environmental niches. The authors demonstrate that these hatchlings were capable of rapid self-righting and used considerably less biomechanical effort relative to adult turtles.
Date: February 28, 2024
Creator: van Casteren, Adam; Sellers, William I.; Crossley, Dane A., II; Costello, Leah M. & Codd, Jonathan R.
Partner: UNT College of Science
open access

Engineering the pore environment of antiparallel stacked covalent organic frameworks for capture of iodine pollutants

Description: The authors of this article assert that radioiodine capture from nuclear fuel waste and contaminated water sources is of enormous environmental importance, but remains technically challenging. They further demonstrate robust covalent organic frameworks with antiparallel stacked structures, excellent radiation resistance, and high binding affinities toward I2, CH3I, and I3 under various conditions.
Date: March 26, 2024
Creator: Xie, Yinghui; Rong, Qiuyu; Mao, Fengyi; Wang, Shiyu; Wu, You; Lu, Xiaolu et al.
Partner: UNT College of Science
open access

Complete separation of benzene-cyclohexene-cyclohexane mixtures via temperature-dependent molecular sieving by a flexible chain-like coordination polymer

Description: This article asserts that the separation and purification of C6 cyclic hydrocarbons (benzene, cyclohexene, cyclohexane) represent a critically important but energy intensive process. The authors report a flexible one-dimensional coordination polymer as an efficient adsorbent to discriminate ternary C6 cyclic hydrocarbons via an ideal molecular sieving mechanism.
Date: March 12, 2024
Creator: Xie, Feng; Chen, Lihang; Cedeño Morales, Eder Moisés; Ullah, Saif; Fu, Yiwen; Thonhauser, Timo et al.
Partner: UNT College of Science
open access

Unraveling radiation damage and healing mechanisms in halide perovskites using energy-tuned dual irradiation dosing

Description: The authors of this article deconvolve the effects of radiation based on different energy loss mechanisms from incident protons which induce defects or can promote efficiency recovery. They goo on to design a dual dose experiment first exposing devices to low-energy protons efficient in creating atomic displacements.
Date: January 24, 2024
Creator: Kirmani, Ahmad R.; Byers, Todd A.; Ni, Zhenyi; VanSant, Kaitlyn; Saini, Darshpreet K.; Scheidt, Rebecca et al.
Partner: UNT College of Science
open access

Black carbon in urban soils: land use and climate drive variation at the surface

Description: The authors of this article conducted a literature review of black carbon in urban soils and found that black carbon comprises a major fraction of the total organic carbon in urban surface soils, yet sampling bias towards the surface could hide the potential for black carbon storage at depth. The authors recorded data on city, climate, and land use/land cover characteristics to examine drivers of black carbon content and contribution to total organic carbon in soil.
Date: March 2, 2024
Creator: Burke, Molly; Marín-Spiotta, Erika & Ponette-González, Alexandra G.
Partner: UNT College of Science
open access

Assessing climate niche similarity between persian fallow deer (Dama mesopotamica) areas in Iran

Description: This article aims to assess the similarity in climate niches between the original area of the Persian deer species and 11 newly enclosed areas. The authors used the environmental equivalency test to determine whether the environmental spaces of area pairs exhibit significant differences and whether these spaces are interchangeable.
Date: July 5, 2024
Creator: Rahimi, Ehsan; Dong, Pinliang & Ahmadzadeh, Faraham
Partner: UNT College of Science
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