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Dioxygen: What Makes This Triplet Diradical Kinetically Persistent? (open access)

Dioxygen: What Makes This Triplet Diradical Kinetically Persistent?

This article examines experimental heats of formation and enthalpies obtained from G4 calculations to find that the resonance stabilization of the two unpaired electrons in triplet Oā‚‚, relative to the unpaired electrons in two hydroxyl radicals, amounts to 100 kcal/mol.
Date: June 14, 2017
Creator: Borden, Weston T.; Hoffmann, Roald; Stuyver, Thijs & Chen, Bo
Object Type: Article
System: The UNT Digital Library
A theoretical study of Mā€“Mā€² polar-covalent bonding in heterobimetallic multinuclear organometallic complexes of monovalent group 11 metal centres (open access)

A theoretical study of Mā€“Mā€² polar-covalent bonding in heterobimetallic multinuclear organometallic complexes of monovalent group 11 metal centres

Article describes how complexes with closed-shell (d10ā€“d10) interactions have been studied for their interesting luminescence properties in organic light-emitting diode (OLED) devices. The present computational study aims at understanding the chemical bonding/interactions in a series of molecules with unusually short metalā€“metal bond distances between monovalent coinage-metal (d10ā€“d10) centres.
Date: February 8, 2023
Creator: RabaĆ¢, Hassan; Sundholm, Dage & Omary, Mohammad A.
Object Type: Article
System: The UNT Digital Library
Toward a More Rational Design of the Direct Synthesis of Aniline: A Density Functional Theory Study (open access)

Toward a More Rational Design of the Direct Synthesis of Aniline: A Density Functional Theory Study

This article uses plane-wave density functional theory calculations to investigate the direct amination of benzene catalyzed by a Ni(111) surface to explore the reaction intermediates and to understand the role of nickel in this reaction.
Date: March 24, 2017
Creator: Alsunaidi, Zainab H. A.; Cundari, Thomas R., 1964- & Wilson, Angela K.
Object Type: Article
System: The UNT Digital Library
Multi-omic characterization of bifunctional peroxidase 4-coumarate 3-hydroxylase knockdown in Brachypodium distachyon provides insights into lignin modification associated pleiotropic effects (open access)

Multi-omic characterization of bifunctional peroxidase 4-coumarate 3-hydroxylase knockdown in Brachypodium distachyon provides insights into lignin modification associated pleiotropic effects

Article discusses how a bifunctional peroxidase enzyme, 4-coumarate 3-hydroxylase (C3H/APX), provides a parallel route to the shikimate shunt pathway for the conversion of 4-coumarate to caffeate in the early steps of lignin biosynthesis. Here, a multi-omic approach was used to characterize molecular changes resulting from C3H/APX-KD associated lignin modification and negative growth phenotype in Brachypodium distachyon.
Date: September 28, 2022
Creator: Shrestha, Him K.; Fichman, Yosef; Engle, Nancy L.; Tschaplinski, Timothy J.; Mittler, Ron; Dixon, R. A. et al.
Object Type: Article
System: The UNT Digital Library
Gene-based association tests using GWAS summary statistics and incorporating eQTL (open access)

Gene-based association tests using GWAS summary statistics and incorporating eQTL

Article proposes a powerful and computationally efficient gene-based association test, called Overall. Using extended Simes procedure, Overall aggregates information from three types of traditional gene-based association tests and also incorporates expression quantitative trait locus (eQTL) information into a gene-based association test using GWAS summary statistics. The results show that this newly developed method can identify more significant genes than other methods.
Date: March 3, 2022
Creator: Cao, Xuwei; Wang, Xuexia; Zhang, Shuanglin & Sha, Qiuying
Object Type: Article
System: The UNT Digital Library
Optical Pump Terahertz Probe (OPTP) and Time Resolved Terahertz Spectroscopy (TRTS) of emerging solar materials Editorā€™s Pick (open access)

Optical Pump Terahertz Probe (OPTP) and Time Resolved Terahertz Spectroscopy (TRTS) of emerging solar materials Editorā€™s Pick

Article describes how photoconductivity is the crucial benchmark to assess the potential of any emerging material for future solar applications. This tutorial aims to familiarize the reader with the main THz techniques used to explore emerging materials.
Date: July 19, 2023
Creator: Neu, Jens
Object Type: Article
System: The UNT Digital Library
State of the world's raptors: Distributions, threats, and conservation recommendations (open access)

State of the world's raptors: Distributions, threats, and conservation recommendations

Article exploring the International Union for the Conservation of Nature's Red List to examine the conservation status, distributions, threats, and conservation recommendations for all 557 raptor species.
Date: September 6, 2018
Creator: McClure, Christopher J.W.; Westrip, James R.S.; Johnson, Jeff A.; Schulwitz, Sarah; Virani, Munir Z.; Davies, Robert et al.
Object Type: Article
System: The UNT Digital Library
Sub-Antarctic Freshwater Invertebrate Thermal Tolerances: An Assessment of Critical Thermal Limits and Behavioral Responses (open access)

Sub-Antarctic Freshwater Invertebrate Thermal Tolerances: An Assessment of Critical Thermal Limits and Behavioral Responses

Describes study which assessed the upper (CTmax) and lower (CTmin) thermal limits of three freshwater macroinvertebrate taxa with restricted low elevation distribution (20 m a.s.l.) and three taxa restricted to upper elevations (480 and 700 m a.s.l.) in the Magellanic sub-Antarctic ecoregion of southern Chile, and argues that their low tolerance to temperature increase can make them useful as indicators of thermal alteration in their habitats.
Date: February 4, 2020
Creator: Rendoll CƔrcamo, Javier; Contador, Tamara; Convey, Peter & Kennedy, James H.
Object Type: Article
System: The UNT Digital Library
High degree of non-genetic phenotypic variation in the vascular system of crayfish: a discussion of possible causes and implications (open access)

High degree of non-genetic phenotypic variation in the vascular system of crayfish: a discussion of possible causes and implications

This article studies the hemolymph vascular system (HVS) in two cambarid crayfishes, i.e. the Marbled Crayfish, Procambarus virginalis Lyko, 2017 and the Spiny Cheek Crayfish, Faxonius limosus (Rafinesque, 1817) in regard to areas of non-genetic phenotypic variation.
Date: August 12, 2021
Creator: Scholz, Stephan; Gƶpel, Torben; Richter, Stefan & Wirkner, Christian S.
Object Type: Article
System: The UNT Digital Library
Metallic nanoparticle production and exposure/deposition system for toxicological research applications using zebrafish (open access)

Metallic nanoparticle production and exposure/deposition system for toxicological research applications using zebrafish

Article presents a method that provides a novel way to synthesize NPs and expose biological organisms for various toxicological analysis.
Date: September 3, 2020
Creator: Nayek, Subhayu; Aguilar, Roberto; Juel, Lauren A. & Verbeck, Guido F.
Object Type: Article
System: The UNT Digital Library
Visualization of Lipid Droplet Composition by Direct Organelle Mass Spectrometry (open access)

Visualization of Lipid Droplet Composition by Direct Organelle Mass Spectrometry

Article reporting an approach that combines the visualization of individual lipid droplets (LDs), microphase extraction of lipid components from droplets, and the direct identification of lipid composition by nanospray mass spectrometry, even to the level of a single LD. The triacylglycerol (TAG) composition of LDs from several plant sources (mature cotton (Gossypium hirsutum) embryos, roots of cotton seedlings, and Arabidopsis thaliana seeds and leaves) were examined by direct organelle mass spectrometry and revealed the heterogeneity of LDs derived from different plant tissue sources.
Date: February 4, 2011
Creator: Horn, Patrick J.; Ledbetter, Nicole R.; James, Christopher N.; Hoffman, William D.; Case, Charlene R.; Verbeck, Guido F. et al.
Object Type: Article
System: The UNT Digital Library
Angiogenesis in the Avian Embryo Chorioallantoic Membrane: A Perspective on Research Trends and a Case Study on Toxicant Vascular Effects (open access)

Angiogenesis in the Avian Embryo Chorioallantoic Membrane: A Perspective on Research Trends and a Case Study on Toxicant Vascular Effects

This article considers areas of cardiovascular research that have benefited from studies of the chorioallantoic membrane (CAM), including the themes of investigation of the CAMā€™s hemodynamic influence on heart and central vessel development, use of the CAM as a model vascular bed for studying angiogenesis, and the CAM as an assay tool.
Date: October 28, 2020
Creator: Burggren, Warren W. & Antich, Maria Rojas
Object Type: Article
System: The UNT Digital Library
Measurement of the Intramolecular Hydrogen-Shift Rate Coefficient for the CH3SCH2OO Radical Between 314 and 433 K (open access)

Measurement of the Intramolecular Hydrogen-Shift Rate Coefficient for the CH3SCH2OO Radical Between 314 and 433 K

Article describes how the intramolecular hydrogen-shift rate coefficient of the CH3SCH2O2 (methylthiomethylperoxy, MSP) radical, a product formed in the oxidation of dimethyl sulfide (DMS), was measured using a pulsed laser photolysis flow tube reactor coupled to a high-resolution time-of-flight chemical ionization mass spectrometer that measured the formation of the DMS degradation end product HOOCH2SCHO. Measurements performed over the temperature range of 314ā€“433 K yielded a hydrogen-shift rate coefficient of k1(T) = (2.39 Ā± 0.7) Ɨ 109 exp(āˆ’(7278 Ā± 99)/T) sā€“1 Arrhenius expression and a value extrapolated to 298 K of 0.06 sā€“1.
Date: March 2, 2023
Creator: Assaf, Emmanuel; Finewax, Zachary; Marshall, Paul; Veres, Patrick R.; Neuman, Andrew & Burkholder, James B. (James Bart), 1954-
Object Type: Article
System: The UNT Digital Library
Patch characteristics and domestic dogs differentially affect carnivore space use in fragmented landscapes in southern Chile (open access)

Patch characteristics and domestic dogs differentially affect carnivore space use in fragmented landscapes in southern Chile

This article's aim is to determine whether (a) the spatial use of domestic dogs increases with habitat destruction, and (b) domestic dogs and habitat destruction drive the spatial use of native carnivores in a heavily degraded agricultural landscape. Conclusions highlight that domestic dog occupancy was positively correlated with habitat loss and future conditions of increased fragmentation and habitat loss will likely increase the potential contact between domestic dogs and native carnivores.
Date: August 30, 2021
Creator: Malhotra, Rumaan; JimƩnez, Jaime E. & Harris, Nyeema C;
Object Type: Article
System: The UNT Digital Library
Phenotypic Switching Resulting From Developmental Plasticity: Fixed or Reversible? (open access)

Phenotypic Switching Resulting From Developmental Plasticity: Fixed or Reversible?

Article explores the question of whether animals with switched phenotypes during early development are unable to return to a normal range of adult phenotypes, or whether they do not experience the specific environmental conditions necessary for them to switch back to the normal range of adult phenotypes.
Date: January 21, 2020
Creator: Burggren, Warren W.
Object Type: Article
System: The UNT Digital Library
Targeting hydroxycinnamoyl CoA: shikimate hydroxycinnamoyl transferase for lignin modification in Brachypodium distachyon (open access)

Targeting hydroxycinnamoyl CoA: shikimate hydroxycinnamoyl transferase for lignin modification in Brachypodium distachyon

This article conducts a study to evaluate the utility of Hydroxycinnamoyl CoA: shikimate hydroxycinnamoyl transferase (HCT) as a target for lignin modification in a species with an ā€œincompleteā€ shikimate shunt. Results imply that this gene is a preferred target for biotechnological improvement of grasses for bioprocessing.
Date: February 27, 2021
Creator: Serrani-Yarce, Juan Carlos; Escamilla-TreviƱo, Luis; Barros, Jaime; Gallego-Giraldo, Lina; Pu, Yunqiao; Ragauskas, Arthur J. (Arthur Jonas), 1957- et al.
Object Type: Article
System: The UNT Digital Library
Lipid signaling in plants (open access)

Lipid signaling in plants

Article on the publication of a volume of articles of researchers addressing various fundamental questions in lipid signaling in plants.
Date: June 27, 2013
Creator: Wang, Xuemin & Chapman, Kent Dean
Object Type: Article
System: The UNT Digital Library
Lignin biosynthesis: old roads revisited and new roads explored (open access)

Lignin biosynthesis: old roads revisited and new roads explored

Article presents several hypothetical models to illustrate information about lignin and the lignification process in plants.
Date: December 4, 2019
Creator: Dixon, R. A. & Barros, Jaime
Object Type: Article
System: The UNT Digital Library
Systematic approaches to C-lignin engineering in Medicago truncatula (open access)

Systematic approaches to C-lignin engineering in Medicago truncatula

Article describes how C-lignin is a homopolymer of caffeyl alcohol present in the seed coats of a variety of plant species including vanilla orchid, various cacti, and the ornamental plant Cleome hassleriana. The authors used information from a transcriptomic analysis of developing C. hassleriana seed coats to suggest strategies for engineering C-lignin in a heterologous system, using hairy roots of the model legume Medicago truncatula.
Date: June 12, 2023
Creator: Ha, Chan Man; Escamilla-TreviƱo, Luis; Zhuo, Chunliu; Pu, Yunqiao; Bryant, Nathan; Ragauskas, Arthur J. (Arthur Jonas), 1957- et al.
Object Type: Article
System: The UNT Digital Library
Whole-genome survey reveals extensive variation in genetic diversity and inbreeding levels among peregrine falcon subspecies (open access)

Whole-genome survey reveals extensive variation in genetic diversity and inbreeding levels among peregrine falcon subspecies

Article describes how, in efforts to prevent extinction, resource managers are often tasked with increasing genetic diversity in a population of concern to prevent inbreeding depression or improve adaptive potential in a changing environment. The authors used whole-genome resequencing to generate over two million single nucleotide polymorphisms (SNPs) from multiple individuals of all peregrine falcon subspecies.
Date: July 20, 2023
Creator: Johnson, Jeff A.; Athrey, Giridhar; Anderson, Clifford M.; Bell, Douglas A.; Dixon, Andrew; Kumazawa, Yoshinori et al.
Object Type: Article
System: The UNT Digital Library
Phylogenetic Occurrence of the Phenylpropanoid Pathway and Lignin Biosynthesis in Plants (open access)

Phylogenetic Occurrence of the Phenylpropanoid Pathway and Lignin Biosynthesis in Plants

This article is a review summarizing recent progress in defining the lignin biosynthetic pathway in lycophytes, monilophytes, gymnosperms, and angiosperms. This review provides new insights into the genetic engineering of the lignin biosynthetic pathway to overcome biomass recalcitrance in bioenergy crops.
Date: August 17, 2021
Creator: Yao, Tao; Feng, Kai; Xie, Meng; Barros, Jaime; Tschaplinski, Timothy J.; Tuskan, Gerald et al.
Object Type: Article
System: The UNT Digital Library
Development and use of a switchgrass (Panicum virgatum L.) transformation pipeline by the BioEnergy Science Center to evaluate plants for reduced cell wall recalcitrance (open access)

Development and use of a switchgrass (Panicum virgatum L.) transformation pipeline by the BioEnergy Science Center to evaluate plants for reduced cell wall recalcitrance

Article examines the creation of a transformation pipeline (TP) to produce plants with decreased recalcitrance and a laboratory information management system (LIMS) for data compilation from these plants. While many genes accepted into the TP resulted in transgenic switchgrass without modified lignin or biomass content, a group of genes with potential to improve lignocellulosic biofuel yields was identified. Results from transgenic lines targeting xyloglucan and lignin structure provide examples of the types of information available on switchgrass lines produced within BioEnergy Science Center (BESC).
Date: December 22, 2017
Creator: Nelson, Richard S.; Stewart, C. Neal; Gou, Jiqing; Holladay, Susan; Gallego-Giraldo, Lina; Flanagan, Amy et al.
Object Type: Article
System: The UNT Digital Library
Combining loss of function of FOLYLPOLYGLUTAMATE SYNTHETASE1 and CAFFEOYL-COA 3-O-METHYLTRANSFERASE1 for lignin reduction and improved saccharification efficiency in Arabidopsis thaliana (open access)

Combining loss of function of FOLYLPOLYGLUTAMATE SYNTHETASE1 and CAFFEOYL-COA 3-O-METHYLTRANSFERASE1 for lignin reduction and improved saccharification efficiency in Arabidopsis thaliana

This article tests if lignin content can be further reduced by combining genetic mutations in C1 metabolism and the lignin biosynthetic pathway by generating and functionally characterizing fpgs1ccoaomt1 double mutants. The observations demonstrate that additional reduction in lignin content and improved sugar release can be achieved by simultaneous downregulation of a gene in the C1 (FPGS1) and lignin biosynthetic (CCOAOMT) pathways.
Date: December 31, 2018
Creator: Xie, Hongli; Engle, Nancy L.; Venketachalam, Sivasankari; Yoo, Chang Geun; Barros, Jaime; Lecoultre, Mitch et al.
Object Type: Article
System: The UNT Digital Library
Combining loss of function of FOLYLPOLYGLUTAMATE SYNTHETASE1 and CAFFEOYL-COA 3-O-METHYLTRANSFERASE1 for lignin reduction and improved saccharification efficiency in Arabidopsis thaliana (open access)

Combining loss of function of FOLYLPOLYGLUTAMATE SYNTHETASE1 and CAFFEOYL-COA 3-O-METHYLTRANSFERASE1 for lignin reduction and improved saccharification efficiency in Arabidopsis thaliana

Article describes study in which fpgs1ccoaomt1 double mutants were generated and functionally characterized in order to test if lignin content can be further reduced by combining genetic mutations in C1 metabolism and the lignin biosynthetic pathway.
Date: May 3, 2019
Creator: Xie, Hongli; Engle, Nancy L.; Venketachalam, Sivasankari; Yoo, Chang Geun; Barros, Jaime; Lecoultre, Mitch et al.
Object Type: Article
System: The UNT Digital Library