Browsing Theses/Dissertations - Environmental Studies by Title
Now showing items 1-20 of 27
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Accumulation of trifluralin and trinitrotoluene (TNT) in two aquatic invertebrates: formation and persistence of unextractable biotransformation products.
(2008-06-09)Exposure to nitroaromatic compounds has been reported to result in unextractable residues, or residues not readily extracted by traditional techniques. However, limited information is available about the formation rate ... -
Age matters : developmental stage of Zebrafish (Danio rerio) influences bioconcentration, and survival and behavioral photomotor response thresholds.
(2017-08-03)Toxicology information for the tens of thousands of compounds in commerce is severely lacking, and with continual introduction of new substances, this global chemical space is only increasing in complexity. Thus, generating ... -
Aquatic toxicology of salinity and silver in Daphnia magna : a comparative study of standardized chronic endpoints and progeny Phototaxis.
(, 2011-12-19)Behavioral bioassays with the model freshwater cladoceran Daphnia magna have the potential to serve as nontraditional but sensitive endpoints of sublethal stress in the field of ecotoxicology. However, few studies have ... -
Assessing interactions between nutrients and aquatic toxicity : influences of nitrogen and phosphorus on ionic silver toxicity to the aquatic macrophyte Lemna gibba.
(2011-05-12)Though nutrients and silver often co-occur in aquatic ecosystems, the combined effects of these environmental stressors on aquatic plants are poorly understood. Such coexposures are important because nanosilver is increasingly ... -
Atmospheric concentrations of organophosphate esters in Delhi, India.
(2018-04-27)The rise of organophosphate esters (OPEs) as ubiquitous global air pollutants is in part associated with their high-production volume, physical and chemical properties, and heavy use in consumer products, including many ... -
A baseline assessment of local mercury deposition from coal-fired power plants in Central Texas.
(2006-10-02)Coal-fired power plants represent the largest source of anthropogenic mercury in the world. The Central Texas region as represented by the Heart of Texas Council of Governments contains two coal-fired power plants located ... -
Bioaccumulation of contaminants of emerging concern in dynamic ecosystems.
(2018-11-14)The aquatic environment includes complex systems on which society relies to provide ecosystem services and support biodiversity. In recent years, the demand for aquatic-ecosystem commodities has greatly increased due to ... -
Designing quantitative structure activity relationships (QSAR) to predict specific toxic endpoints for polybrominated diphenyl ethers (PBDE) in mammalian cell culture systems.
(, 2011-12-19)Polybrominated diphenyl ethers (PBDEs) are becoming increasingly known as effective flame retardants and have vast industrial application in products like plastics, building materials, and textiles. They are found to be ... -
The fate of phosphate in the MixAlco process and its applicability to a Central Texas watershed.
(2007-01-19)The MixAlco process is proposed as a means to reduce phosphorus concentrations in dairy cow manure in order to help improve water quality in the Lake Waco watershed. Numerous dairy farms and intensive agricultural practices ... -
Hydrology of non-riverine freshwater wetlands of the upper Texas coast.
(2010-06-23)Coastal Prairie Freshwater Wetlands (CPFWs) are characterized by depressions and flats that occur in the Galveston Bay area. Studies estimate that over 9,000 acres of CPFWs were lost between 1992 and 2002. The cumulative ... -
Individual and interactive influences of low dissolved oxygen and calcium channel blockers in inland aquatic systems.
(2018-08-31)Understanding and managing influences of multiple stressors represents a major water quality challenge, particularly in urbanizing regions. Because aquatic hazard assessments with chemical and nonchemical stressors can ... -
Influences of nutrients and salinity on Prymnesium parvum elicited sublethal toxicity in two common fish models.
(2018-07-12)The magnitude, frequency, and duration of harmful algal blooms (HABs) are increasing worldwide primarily due to climate change and anthropogenic activities. Prymnesium parvum is a euryhaline and eurythermal HAB forming ... -
Influences of spatio-temporal variability during aquatic assessments of ionizable contaminants.
(2019-04-16)Urbanization and evolving land-use is challenging water management strategies in semi-arid regions of the United States, where stream flows are often dominated by treated wastewater effluent discharges. Effluent-dominated ... -
Investigating the efficacy of a novel therapeutic to mitigate traumatic brain injury : contributions of environmental exposures to overall healing.
(2015-07-30)Traumatic brain injury (TBI) is a leading cause of disability and premature death among both civilians and military. Morbidity and deaths are mainly caused by several secondary process that exacerbate brain dysfunction in ... -
Microplastic ingestion by freshwater and marine fish from the Brazos River basin and Texas nearshore marine waters.
(2018-07-16)This dissertation serves as one of the first comprehensive system investigations of microplastic ingestion by freshwater and marine fish from the Brazos River basin and Texas nearshore marine waters. In total, 436 freshwater ... -
Microplastic pollution in surface waters of urban watersheds in Central Texas, USA : a comparison above and below treated wastewater effluents.
(2018-11-20)Microplastics are polymer-based particles ranging in size from 50 µm to 5 mm. The behavior of microplastics within freshwater systems remains understudied. The purposes of this study are to assess microplastic levels in ... -
Multigenerational responses of Daphnia magna to Ethynylestradiol and Faslodex.
(2006-05-11)Select environmental contaminants can disrupt normal functions of aquatic invertebrate endocrine systems. While ecological risk assessments often rely on standardized laboratory toxicity tests to assess ecological impacts, ... -
The oaks of Independence : a landscape history of the original site of Baylor University and the potential surrounding historic district.
(2011-05-12)The landscape in and around the village of Independence in northeastern Washington County, Texas, is characterized by dense old growth riparian zones, released old fields, open pastures, and regenerated woodlots. The ... -
Prymnesium parvum effects on green algae, cladocerans and fish in field and laboratory studies.
(2008-08-12)Prymnesium parvum, commonly named “golden algae,” has severely impacted fisheries in Texas, USA and other parts of the world. This study explored the environmental conditions during fish kills in Texas inland waters known ... -
Prymnesium parvum in inland waters : comparative toxicity, microcystin allelopathy, and toxin photodegradation.
(2009-09-09)The harmful algal species Prymnesium parvum, a toxin-producing mixotrophic haptophyte, has caused massive fish kills in slightly saline inland Texas water bodies. In the first study, standardized aquatic test models from ...