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Articles 61 - 74 of 74
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Hydraulic Resistance: A Determinant Of Short Term Stomatal Conductance Signaling In Disparate Xylem Anatomy Of Red Maple (Acer Rubrum L.) And Shumard Oak (Quercus Shumardii Buckl.), William Inman
All Theses
Recent work has shown that stomatal conductance (gs) and net photosynthesis (Anet) are responsive to the hydraulic conductance of the soil to leaf pathway (Xp). However, no study has compared xylem anatomical differences under controlled conditions to directly evaluate the whole plant hydraulic and chemical response to manipulations of Xp. Two tree species with differing xylem structures were used to study the effect of systematic manipulations in Xp that elevated xylem hydraulic resistance. Simultaneous measures of gs, Anet, bulk leaf abscisic acid concentration, leaf water potential, and whole plant transpiration were taken under controlled environment conditions. Shumard oak, a ring …
In Vitro Liquid Culture Systems Of Scutellaria Species, Ayse Tascan
In Vitro Liquid Culture Systems Of Scutellaria Species, Ayse Tascan
All Theses
In vitro culture of three Scutellaria species (S. lateriflora, S. costaricana and S. baicalensis) compared growth on different culture systems; agar and liquid cultures; stationary (LS), agitated (LA) and floating paper (FP). Fresh (FW), dry (DW), % dry weight (%DW=DW/FW), multiplication ratio (MR) and, sucrose, media and water use were compared. LA and LS plantlets were more hyperhydric, had more biomass, except S. baicalensis in LS, and less MR compared to agar and FP plantlets. A second experiment was conducted comparing liquid, agar and polyester fiber matrixes at different initial media volumes-30 mL and 20 mL. Plantlets from fiber had …
Assessment Of Hydration Knowledge, Attitude, Behaviors And Fluid Replacement Effectiveness Of Collegiate Athletes., Jeffie Trammell
Assessment Of Hydration Knowledge, Attitude, Behaviors And Fluid Replacement Effectiveness Of Collegiate Athletes., Jeffie Trammell
All Theses
The purpose of this study was to determine if there was any significant correlation between an athletes' knowledge, attitude, and behavior in regards to hydration and how well they maintained their level during preseason training. 74 athletes completed surveys that measured their knowledge, attitude, and behavior in regards to hydration. 59 athletes allowed monitoring of their hydration status via weight charts. Significant differences in knowledge and behavior scores were found between demographic variables such as class year, training intensity, and team. There were no significant correlations discovered between any of the survey scores and the data from the weight charts. …
Physiochemical Properties And Bioactivities Of Tea Seed (Camellia Oleifera) Oil, Yen-Hui Chen
Physiochemical Properties And Bioactivities Of Tea Seed (Camellia Oleifera) Oil, Yen-Hui Chen
All Theses
Tea seed (Camellia oleifera) oil has been used for cooking in China and other Asian countries for more than a thousand years. This study determined the fatty acid composition and tocopherol content through chromatography-flame ionization (GC-FID) and high performance liquid chromatography-UV (HPLC-UV) , respectively. The results showed that the tea seed oil (TSE) was mainly composed of 18.30% palmitic acid (C16:0), 54.95% oleic acid (C18:1), 22.41% linoleic acid (C18:2), and 0.17% linolenic acid (C18:3). Its α-tocopherol content was found the 21.13 mg/100 g oil. Moreover, the antioxidant capacities of methanolic extract of TSE and the remaining meal (Meal)were …
The Proliferative Response Of Equine Chondrocytes To Bovine Lymph Node Proteins In Vitro , Alison Reed
The Proliferative Response Of Equine Chondrocytes To Bovine Lymph Node Proteins In Vitro , Alison Reed
All Theses
Osteoarthritis is a leading cause of chronic lameness in horses. Many treatment options for osteoarthritis have limited effectiveness and are expensive. Treatments that stimulate cartilage development may promote cartilage healing. Bovine supramammary lymph nodes are available at no cost and contain bioactive growth factors that could promote cartilage healing. The purpose of this study was to measure the proliferative response of equine chondrocytes to bovine lymph node proteins. Chondrocytes were harvested from adult horses. Lymph node extract (LNE) was prepared by mixing freeze-dried lymph node powder with PBS. Experiments compared BGS and LNE on equal and unequal protein bases. Additional …
Influence Of Supramammary Lymph Node Extract On Cell Growth In Vitro, Danelle Duffy
Influence Of Supramammary Lymph Node Extract On Cell Growth In Vitro, Danelle Duffy
All Theses
ABSTRACT The bovine supramammary lymph node, located on the dorso-caudal surface of the udder, is a protein rich organ that is discarded on a regular basis during slaughter. Experiments were conducted to evaluate whether or not the lymph node extract could be used as a substitute for bovine growth serum in cell media. Two different preparations of lymph node extract were made and tested. Three different cell lines (MDA-MB-435, MAC-T, and 1C6) were used in assays to evaluate the lymph node extract as a supplement. The first extract yielded a protein concentration of 3.0 mg/ml (heat inactivated) and the second …
Associating Larvae And Adults Of Chinese Hydropsychidae Caddiflies (Insecta:Trichoptera) Using Dna Sequences, Xin Zhou, Karl M. Kjer, John C. Morse
Associating Larvae And Adults Of Chinese Hydropsychidae Caddiflies (Insecta:Trichoptera) Using Dna Sequences, Xin Zhou, Karl M. Kjer, John C. Morse
Publications
The utility of hydropsychid (Trichoptera:Hydropsychidae) caddisfly larvae for freshwater biomonitoring has been demonstrated, but the major impediment to its implementation has been the lack of species-level larval descriptions and illustrations. A rapid and reliable molecular protocol that also uses morphology is proposed because conventional approaches to associating undescribed larvae with adults have been slow and problematic. Male adults were identified before DNA sequence analyses were used. These identifications established morphospecies boundaries that were mapped on phylograms constructed from 2 independent gene fragments: mitochondrial cytochrome c oxidase subunit I (COI) and large subunit (28S) nuclear ribosomal DNA expansion fragment D2 (D2). …
A Link Between Hurricane-Induced Tree Sprouting, High Stem Density And Short Canopy In Tropical Dry Forest, Skip Van Bloem, Peter G. Murphy, Ariel E. Lugo
A Link Between Hurricane-Induced Tree Sprouting, High Stem Density And Short Canopy In Tropical Dry Forest, Skip Van Bloem, Peter G. Murphy, Ariel E. Lugo
Publications
The physiognomy of Caribbean dry forest is shorter, denser and contains a greater proportion of multi-stemmed trees than other neotropical dry forests. Our previous research, conducted after Hurricane Georges in 1998, has shown that dry forest trees sprout near the base following hurricane disturbance, even if the trees have not incurred structural damage. However, for these hurricane-induced sprouts to contribute to the physiognomy of the forest, they must grow and survive. We followed sprout dynamics and stem mortality on 1,407 stems from 1998, after Hurricane Georges, until 2005. The number of surviving sprouts and the proportion of sprouting stems decreased …
Urban Physiology: City Ants Possess High Heat Tolerance, Michael W. Sears, Michael J. Angilletta, Robbie S. Wilson, Amanda C. Niehaus, Pedro L. Ribeiro, Carlos A. Navas
Urban Physiology: City Ants Possess High Heat Tolerance, Michael W. Sears, Michael J. Angilletta, Robbie S. Wilson, Amanda C. Niehaus, Pedro L. Ribeiro, Carlos A. Navas
Publications
Urbanization has caused regional increases in temperature that exceed those measured on a global scale, leading to urban heat islands as much as 12°C hotter than their surroundings. Optimality models predict ectotherms in urban areas should tolerate heat better and cold worse than ectotherms in rural areas. We tested these predications by measuring heat and cold tolerances of leaf-cutter ants from South America’s largest city (São Paulo, Brazil). Specifically, we compared thermal tolerances of ants from inside and outside of the city. Knock-down resistance and chill-coma recovery were used as indicators of heat and cold tolerances, respectively. Ants from within …
Ontogenetic Change In Novel Functions: Waterfall Climbing In Adult Hawaiian Gobiid Fishes, R Blob, K M. Wright, M Becker, T Maie, T J. Iverson, M L. Julius, H L. Schoenfuss
Ontogenetic Change In Novel Functions: Waterfall Climbing In Adult Hawaiian Gobiid Fishes, R Blob, K M. Wright, M Becker, T Maie, T J. Iverson, M L. Julius, H L. Schoenfuss
Megan Sheffield
Juveniles from three species of Hawaiian gobiid fishes climb waterfalls as part of an amphidromous life cycle, allowing them to re-penetrate adult upstream habitats after being swept out to the ocean upon hatching. The importance of climbing for juvenile stream gobies is well established, but adult fish in upstream island habitats also face potential downstream displacement by periodic disturbances. Thus, retention of climbing ability could be advantageous for adult stream gobies. Climbing performance might be expected to decline among adults, however, due to the tendency for mass-specific muscular power production to decrease with body size, and a lack of positively …
Wind Damage And Salinity Effects Of Hurricanes Katrina And Rita On Coastal Baldcypress Forests Of Louisiana, William Conner, Thomas W. Doyle, Richard H. Day, Ken W. Krauss, Christopher M. Swarzenski
Wind Damage And Salinity Effects Of Hurricanes Katrina And Rita On Coastal Baldcypress Forests Of Louisiana, William Conner, Thomas W. Doyle, Richard H. Day, Ken W. Krauss, Christopher M. Swarzenski
Publications
The frequency of hurricane landfall in a given coastal stretch may play a more important role in the ecology of coastal forests than previously thought because of direct and indirect impacts of fallen trees and the introduction of salt water that lingers long after the storm passes. Findings show that surge events can inundate interior freshwater forests many miles from the coast and elevate soil salinities twofold to threefold. These elevated salinities may contribute to delayed mortality of certain tree species and set the stage for eventual forest decline and dieback.
Science And The Storms: The Usgs Response To The Hurricanes Of 2005 - Chapter Six: Ecological Impacts, William Conner, Stephen Faulkner, Wylie Barrow, Brady Couvillion, Lori Randall, Michael Baldwin
Science And The Storms: The Usgs Response To The Hurricanes Of 2005 - Chapter Six: Ecological Impacts, William Conner, Stephen Faulkner, Wylie Barrow, Brady Couvillion, Lori Randall, Michael Baldwin
Publications
Ecological impacts from the hurricanes of 2005 affected both vegetation and the animals that depend on coastal habits on land and in water. Discussed in this section are migratory birds, coastal marsh vegetation, chenier forests, coastal floodplain forests, mangrove forests, estuaries, and the endangered manatee.
Conservation And Use Of Coastal Wetland Forests In Louisiana, William Conner, Stephen P. Faulkner, Jim L. Chambers, Richard F. Keim, John W. Day, Emile S. Gardiner, Melinda S. Hughes, Sammy L. King, Kenneth W. Mcleod, Craig A. Miller, J Andrew Nyman, Gary P. Shaffer
Conservation And Use Of Coastal Wetland Forests In Louisiana, William Conner, Stephen P. Faulkner, Jim L. Chambers, Richard F. Keim, John W. Day, Emile S. Gardiner, Melinda S. Hughes, Sammy L. King, Kenneth W. Mcleod, Craig A. Miller, J Andrew Nyman, Gary P. Shaffer
Publications
The natural ecosystems of coastal Louisiana reflect the underlying geomorphic processes responsible for their formation. The majority of Louisiana's wetland forests are found in the lower reaches of the Mississipp Alluvial Valley and the Deltaic Plain. The sediments, water, and energy of the Mississippi River have shaped the Deltaic Plain as natural deltas have been formed and abandoned over the last 5,000 years (Coleman et al. 1998). During the regressive or constructional phase of the delta cycle, the system is dominated by freshwater riverine inputs with the formation of corresponding freshwater marshes and swamps, which then deteriorate during the marine-dominated …
Moistened Seeds Increase Rodent Trap Success, Michael W. Sears, John C. Tull
Moistened Seeds Increase Rodent Trap Success, Michael W. Sears, John C. Tull
Publications
Seed moisture has been shown to influence the rates of seed cache removal by rodents. Although the precise mechanism is not known, this knowledge might prove useful in field applications. We examined whether moistened bait would increase trap success in desert rodent populations. We placed traps 15 m apart in grids within a 500-ha study area and randomly baited traps with either dry or moistened seeds. We found that traps baited with moistened seeds had 34.9% higher success than traps baited with dry seeds (n = 190, Χ2 = 5.389, df = 1, P = 0.020). Our results …