1,853 Matching Results

Search Results

prev Results: 985 - 1008 next
open access

Final Technical Report: Response of Mediterranean-Type Ecosystems to Elevated Atmospheric CO2 and Associated Climate Change

Description: This research incorporated an integrated hierarchical approach in space, time, and levels of biological/ecological organization to help understand and predict ecosystem response to elevated CO{sub 2} and concomitant environmental change. The research utilized a number of different approaches, and collaboration of both PER and non-PER investigators to arrive at a comprehensive, integrative understanding. Central to the work were the CO{sub 2}-controlled, ambient Lit, Temperature controlled (CO{s… more
Date: August 15, 2002
Creator: Oechel, Walter C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hepatotoxicity of Mercury to Fish

Description: Tissue samples from spotted gar (Lepisosteus oculatus) and largemouth bass (Micropterus salmoides) were collected from Caddo Lake. Gar and bass livers were subjected to histological investigation and color analysis. Liver color (as abs at 400 nm) was significantly correlated with total mercury in the liver (r2 = 0.57, p = 0.02) and muscle (r2 = 0.58, p = 0.01) of gar. Evidence of liver damage as lipofuscin and discoloration was found in both species but only correlated with liver mercury con… more
Date: August 2010
Creator: Barst, Benjamin Daniel
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Phototoxic Effects of Titanium Dioxide Nanoparticles on Daphnia Magna

Description: Titanium dioxide nanoparticles (TiO2-NP) are one of the most abundantly utilized nanomaterials in the world. Studies have demonstrated the mechanism of acute toxicity in TiO2-NP to be the production of reactive oxygen species (ROS) leading to oxidative stress and mortality in exposed organisms. It has also been demonstrated that the anatase crystalline conformation is capable of catalyzing the cleavage of water molecules to further increase the concentration of ROS in the presence of ultraviole… more
Date: December 2013
Creator: Mansfield, Charles M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

The transcriptional diversity of 25 Drosophila cell lines

Description: Drosophila melanogaster cell lines are important resources for cell biologists. Here, we catalog the expression of exons, genes, and unannotated transcriptional signals for 25 lines. Unannotated transcription is substantial (typically 19% of euchromatic signal). Conservatively, we identify 1405 novel transcribed regions; 684 of these appear to be new exons of neighboring, often distant, genes. Sixty-four percent of genes are expressed detectably in at least one line, but only 21% are detected i… more
Date: November 15, 2010
Creator: Cherbas, Lucy; Willingham, Aarron; Zhang, Dayu; Yang, Li; Zou, Yi; Eads, Brian D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characterization and Monitoring Data for Evaluating Constructed Emergent Sandbar Habitat in the Missouri River Mainstem

Description: Emergent sandbar habitat (ESH) in the Missouri River Mainstem System is a critical habitat element for several federally listed bird species: the endangered interior least tern (Sterna antillarum) and the threatened Northern Great Plains piping plover (Charadrius melodus). The Army Corps of Engineers (Corps) provides the primary operational management of the Missouri River and is responsible under the Endangered Species Act (ESA) to take actions within its authorities to conserve listed species… more
Date: November 6, 2008
Creator: Duberstein, Corey A. & Downs, Janelle L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Constraints-based stoichiometric analysis of hypoxic stress on steroidogenesis in fathead minnows, Pimephales promelas

Description: This article presents a study in which an in silico genome-scale metabolic model of steroidogenesis is used to investigate the effects of hypoxic stress on steroid hormone productions in fish. This article introduces a powerful model for pathway analysis that can lend insights on the effects of various stressor scenarios on metabolic functions.
Date: May 15, 2012
Creator: Hala, David; Petersen, Lene H.; Martinovic, Dalma & Huggett, Duane B.
Item Type: Refine your search to only Article
Partner: UNT Institute of Applied Sciences
open access

Effects of dispersal strategy and migration history on genetic diversity and population structure of Antarctic lichens

Description: Article studying the effects of dispersal strategy and migration history on lichen genetic structure to better understand the importance of these processes and their interplay in shaping population structure as well as their relevance for conservation.
Date: March 23, 2021
Creator: Lagostina, Elisa; Andreev, Mikhail; Dal Grande, Francesco; Grewe, Felix; Lorenz, Aline; Lumbsch, H. Thorsten et al.
Item Type: Refine your search to only Article
Partner: UNT College of Liberal Arts & Social Sciences
open access

Retinal oxygen supply shaped the functional evolution of the vertebrate eye

Description: Article explores the hypothesis that oxygen diffusion limited the evolution of retinal morphology by reconstructing the evolution of retinal thickness and the various mechanisms for retinal oxygen supply, including capillarization and acid-induced haemoglobin oxygen unloading.
Date: December 10, 2019
Creator: Damsgaard, Christian; Lauridsen, Henrik; Funder, Anette MD; Thomsen, Jesper S.; Desvignes, Thomas; Crossley, Dane A., II et al.
Item Type: Refine your search to only Article
Partner: UNT College of Science
open access

Metabolic Allometry during Development and Metamorphosis of the Silkworm Bombyx mori: Analyses, Patterns, and Mechanisms

Description: This article studies the silkworm Bombyx mori, and hypothesizes that allometric relationships for metabolism both across all developmental stages and within each stage would not reflect conventional scaling coefficients.
Date: January 27, 2010
Creator: Blossman-Myer, Bonnie L. & Burggren, Warren W.
Item Type: Refine your search to only Article
Partner: UNT College of Arts and Sciences
open access

Ecological Responses to Severe Flooding in Coastal Ecosystems: Determining the Vegetation Response to Hurricane Harvey within a Texas Coast Salt Marsh

Description: Vegetative health was measured both before and after Hurricane Harvey using remotely sensed vegetation indices on the coastal marshland surrounding Galveston Island's West Bay. Data were recorded on a monthly basis following the hurricane from September of 2005 until September of 2019 in order to document the vegetation response to this significant disturbance event. Both initial impact and recovery were found to be dependent on a variety of factors, including elevation zone, spatial proximity … more
Date: August 2021
Creator: Hudman, Kenneth Russell
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Structure and Function of Subsurface Microbial Communities Affecting Radionuclide Transport and Bioimmobilization

Description: The objectives of this project were to: (1) isolate and characterize novel anaerobic prokaryotes from subsurface environments exposed to high levels of mixed contaminants (U(VI), nitrate, sulfate), (2) elucidate the diversity and distribution of metabolically active metal- and nitrate-reducing prokaryotes in subsurface sediments, and (3) determine the biotic and abiotic mechanisms linking electron transport processes (nitrate, Fe(III), and sulfate reduction) to radionuclide reduction and immobi… more
Date: June 15, 2011
Creator: Kostka, Joel E.; Kerkhof, Lee; Chin, Kuk-Jeong; Keller, Martin & Stucki, Joseph W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Southwest Retort, Volume 21, Number 7, March 1969

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: March 1969
Creator: American Chemical Society. Dallas/Fort Worth Section.
Item Type: Refine your search to only Journal/Magazine/Newsletter
Partner: UNT Libraries
open access

Southwest Retort, Volume 9, Number 7, March 1957

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: March 1957
Creator: American Chemical Society. Dallas/Fort Worth Section.
Item Type: Refine your search to only Journal/Magazine/Newsletter
Partner: UNT Libraries
open access

Microscopic and Autoradiographic Studies of Distribution of Uranium in the Rat Kidney

Description: Report issued by the Oak Ridge National Laboratory discussing studies conducted on uranium retention in rat kidneys. Methods, equipment, and results of the studies are presented. This report includes tables, illustrations, and photographs.
Date: February 1965
Creator: Jones, Edith Seymour
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Literature review: Phytoaccumulation of chromium, uranium, and plutonium in plant systems

Description: Phytoremediation is an integrated multidisciplinary approach to the cleanup of contaminated soils, which combines the disciplines of plant physiology, soil chemistry, and soil microbiology. Metal hyperaccumulator plants are attracting increasing attention because of their potential application in decontamination of metal-polluted soils. Traditional engineering technologies may be too expensive for the remediation of most sites. Removal of metals from these soils using accumulator plants is the … more
Date: May 1, 1998
Creator: Hossner, L. R.; Loeppert, R. H.; Newton, R. J. & Szaniszlo, P. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The photosynthetic acclimation of Lolium perenne in response to three years growth in a free-air CO{sub 2} enrichment (FACE) system

Description: Pure stands of Ryegrass were in their third year of growth in the field, exposed to either ambient (355 {mu}mol mol{sup -1}), or elevated (600 {mu}mol mol{sup -1}) atmospheric CO{sub 2} concentration. A Free-Air CO{sub 2} Enrichment (FACE) system was used to maintain the elevated CO{sub 2} concentration whilst limiting experimental constraints on the field conditions. The theoretically predicted increase in the net rates of CO{sub 2} uptake per unit leaf area (A {mu}mol mol{sup -1}) as a conseq… more
Date: August 1, 1996
Creator: Hymus, G.J.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

1994 Baseline biological studies for the Device Assembly Facility at the Nevada Test Site

Description: This report describes environmental work performed at the Device Assembly Facility (DAF) in 1994 by the Basic Environmental Monitoring and Compliance Program (BECAMP). The DAF is located near the Mojave-Great Basin desert transition zone 27 km north of Mercury. The area immediately around the DAF building complex is a gentle slope cut by 1 to 3 m deep arroyos, and occupied by transitional vegetation. In 1994, construction activities were largely limited to work inside the perimeter fence. The D… more
Date: February 1, 1995
Creator: Townsend, Y.E.; Woodward, B.D.; Hunter, R.B.; Greger, P.D. & Saethre, M.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen