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- Faculty of Science - Papers (Archive) (3)
- All Graduate Theses and Dissertations, Spring 1920 to Summer 2023 (2)
- Amru Bin Nasrulhaq Boyce (1)
- Biology Department Faculty Publication Series (1)
- Biology Faculty Publications and Presentations (1)
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- College of Natural and Applied Sciences (1)
- Dartmouth Scholarship (1)
- Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298 (1)
- Horticulture Faculty Publications (1)
- LSU Master's Theses (1)
- Marine & Environmental Sciences Faculty Articles (1)
- School of Biological Sciences: Dissertations, Theses, and Student Research (1)
- Turkish Journal of Agriculture and Forestry (1)
- Turkish Journal of Botany (1)
- United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications (1)
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Articles 1 - 18 of 18
Full-Text Articles in Entire DC Network
Type Ii Protein Arginine Methyltransferase 5 (Prmt5) Is Required For Circadian Pperiod Determination In Arabidopsis Thaliana, Sunghyun Hong, Hae-Ryoung Song, Kerry Lutz, Randall A. Kerstetter, Todd P. Michael, C. Robertson Mcclung
Type Ii Protein Arginine Methyltransferase 5 (Prmt5) Is Required For Circadian Pperiod Determination In Arabidopsis Thaliana, Sunghyun Hong, Hae-Ryoung Song, Kerry Lutz, Randall A. Kerstetter, Todd P. Michael, C. Robertson Mcclung
Dartmouth Scholarship
Posttranslational modification is an important element in circadian clock function from cyanobacteria through plants and mammals. For example, a number of key clock components are phosphorylated and thereby marked for subsequent ubiquitination and degradation. Through forward genetic analysis we demonstrate that protein arginine methyltransferase 5 (PRMT5; At4g31120) is a critical determinant of circadian period in Arabidopsis. PRMT5 is coregulated with a set of 1,253 genes that shows alterations in phase of expression in response to entrainment to thermocycles versus photocycles in constant temperature. PRMT5 encodes a type II protein arginine methyltransferase that catalyzes the symmetric dimethylation of arginine residues (Rsme2). …
A Comparison Of Cumulative-Germination Response Of Cheatgrass (Bromus Tectorum L.) And Five Perennial Bunchgrass Species To Simulated Field-Temperature Regimes, Stuart P. Hardegree, Corey A. Moffet, Bruce A. Roundy, Thomas A. Jones, Stephen J. Novak, Patrick E. Clark, Frederick B. Pierson, Gerald N. Flerchinger
A Comparison Of Cumulative-Germination Response Of Cheatgrass (Bromus Tectorum L.) And Five Perennial Bunchgrass Species To Simulated Field-Temperature Regimes, Stuart P. Hardegree, Corey A. Moffet, Bruce A. Roundy, Thomas A. Jones, Stephen J. Novak, Patrick E. Clark, Frederick B. Pierson, Gerald N. Flerchinger
Biology Faculty Publications and Presentations
Cheatgrass (Bromus tectorum L.) has come to dominate millions of hectares of rangeland in the Intermountain western United States. Previous studies have hypothesized that one mechanism conferring a competitive advantage to this species is the ability to germinate rapidly at low temperatures in the fall, winter and spring and, therefore, initiate growth and establishment more rapidly than more desirable perennial bunchgrass species. In this experiment, we developed thermal-germination-response models for multiple seedlots of cheatgrass and five perennial grass species. We conducted sensitivity analysis on potentialcumulative- germination response to a 38-y simulation of field-variable conditions of seedbed temperature and moisture. …
Assessing Linkages Among Landscape Characteristics, Stream Habitat, And Macroinvertebrate Communities In The Idaho Batholith Ecoregion, Andrew C. Hill
Assessing Linkages Among Landscape Characteristics, Stream Habitat, And Macroinvertebrate Communities In The Idaho Batholith Ecoregion, Andrew C. Hill
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Understanding the composition of lotic communities and the landscape processes and habitat characteristics that shape them is one of the main challenges confronting stream ecologists. In order to better understand the linkages among landscape processes, stream habitat, and biological communities and to understand how accurately our measurements represent important factors influencing biological communities, it is important to test explicit hypotheses regarding these linkages. Increasing our understanding of aquatic communities in a hierarchical context and recognizing how well our measurements represent factors structuring aquatic communities will help managers better evaluate the influence of land management practices on aquatic ecosystems, direct conservation …
Time, Temperature And Species Interactions In A Duckweed-Herbivore Mesocosm, Ian Waterman
Time, Temperature And Species Interactions In A Duckweed-Herbivore Mesocosm, Ian Waterman
School of Biological Sciences: Dissertations, Theses, and Student Research
Species interactions within a community are impacted by a variety of abiotic factors. Temperature is known to alter population dynamics such that direct and indirect interactions between populations within a community are affected. Here I investigate the effect of temperature change on species interactions within a duckweed-herbivore mesocosm. Multiple communities were constructed, from a single population of duckweed, to two populations of duckweed consumed by aphids. In the one-predator two-prey web we predicted mutually positive indirect effects between duckweed populations during the first generation of growth. As aphid populations respond numerically to more abundant prey, mutually negative and asymmetric indirect …
Fish Communities On The World's Warmest Reefs: What Can They Tell Us About The Effects Of Climate Change In The Future?, David A. Feary, John A. Burt, Andrew G. Bauman, Paolo Usseglio, Peter F. Sale, Georgenes Cavalcante
Fish Communities On The World's Warmest Reefs: What Can They Tell Us About The Effects Of Climate Change In The Future?, David A. Feary, John A. Burt, Andrew G. Bauman, Paolo Usseglio, Peter F. Sale, Georgenes Cavalcante
Marine & Environmental Sciences Faculty Articles
To examine the role of climatic extremes in structuring reef fish communities in the Arabian region, reef fish communities were visually surveyed at four sites within the southern Persian Gulf (also known as the Arabian Gulf and The Gulf), where sea-surface temperatures are extreme (range: 12–35° C annually), and these were compared with communities at four latitudinally similar sites in the biogeographically connected Gulf of Oman, where conditions are more moderate (range: 22–31° C annually). Although sites were relatively similar in the cover and composition of coral communities, substantial differences in the structure and composition of associated fish assemblages were …
Upper Thermal Tolerances Of Early Life Stages Of Freshwater Mussels, Tamara J. Pandolfo, W. Gregory Cope, Consuelo Arellano, Robert B. Bringolf, M. Christopher Barnhart
Upper Thermal Tolerances Of Early Life Stages Of Freshwater Mussels, Tamara J. Pandolfo, W. Gregory Cope, Consuelo Arellano, Robert B. Bringolf, M. Christopher Barnhart
College of Natural and Applied Sciences
Freshwater mussels (order Unioniformes) fulfill an essential role in benthic aquatic communities, but also are among the most sensitive and rapidly declining faunal groups in North America. Rising water temperatures, caused by global climate change, industrial discharges, drought, or land development, could further challenge imperiled unionid communities. The aim of our study was to determine the upper thermal tolerances of the larval (glochidia) and juvenile life stages of freshwater mussels. Glochidia of 8 species of mussels were tested: Lampsilis siliquoidea, Potamilus alatus, Ligumia recta, Ellipsaria lineolata, Lasmigona complanata, Megalonaias nervosa, Alasmidonta varicosa, and Villosa delumbis. Seven of these species also …
Optimizing The Physical And Nutritional Environment Of Unleached Root-Zones, Curtis B. Adams
Optimizing The Physical And Nutritional Environment Of Unleached Root-Zones, Curtis B. Adams
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Unleached root-zones represent an environmental ideal by eliminating wasteful leaching of nutrients and water. NASA grows plants in space in unleached root-zones, incorporating polymer-coated fertilizer (PCF) into a ceramic media (Turface or Profile). However, lack of growth productivity in space has led to the need for research to improve the nutritional and physical environment of the root-zone, which is the objective of this research. PCF types are diverse in release characteristics and the effects of temperature and substrate water content have not been well characterized. In spite of widespread use, studies on chemical properties and applied studies to verify soil …
A Comparison Of Cumulative-Germination Response Of Cheatgrass (Bromus Tectorum L.) And Five Perennial Bunchgrass Species To Simulated Field-Temperature Regimes, Stuart P. Hardegree, Corey A. Moffet, Bruce A. Roundy, Thomas A. Jones, Stephen J. Novak, Patrick E. Clark, Frederick B. Pierson, Gerald N. Flerchinger
A Comparison Of Cumulative-Germination Response Of Cheatgrass (Bromus Tectorum L.) And Five Perennial Bunchgrass Species To Simulated Field-Temperature Regimes, Stuart P. Hardegree, Corey A. Moffet, Bruce A. Roundy, Thomas A. Jones, Stephen J. Novak, Patrick E. Clark, Frederick B. Pierson, Gerald N. Flerchinger
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Cheatgrass (Bromus tectorum L.) has come to dominate millions of hectares of rangeland in the Intermountain western United States. Previous studies have hypothesized that one mechanism conferring a competitive advantage to this species is the ability to germinate rapidly at low temperatures in the fall, winter and spring and, therefore, initiate growth and establishment more rapidly than more desirable perennial bunchgrass species. In this experiment, we developed thermal-germination-response models for multiple seedlots of cheatgrass and five perennial grass species. We conducted sensitivity analysis on potential-cumulative-germination response to a 38-year simulation of field-variable conditions of seedbed temperature and moisture. Cheatgrass …
Temporal Dynamics Of Group Size And Sexual Segregation In Ibex, N. J. Singh, S. Amgalanbaatar, Richard P. Reading
Temporal Dynamics Of Group Size And Sexual Segregation In Ibex, N. J. Singh, S. Amgalanbaatar, Richard P. Reading
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
Group size is an important variable describing behavioral ecology of animals. A variety of factors such as habitat characteristics, life history, spatio-temporal resource dynamics, population density, predation risk, competition with kin, and social learning often determine group size in large mammals. We studied temporal dynamics of group size in Siberian ibex (Capra sibirica) in a protected area in Mongolia. We measured monthly and yearly variations in typical group size and used the sexual segregation and aggregation statistic to assess sexual segregation. Ibex formed the largest groups in November and smallest groups in July. However, group sizes did not …
Effect Of Sucrose And Kinetin On The Quality And Vase Life Of Bougainvillea Glabra Var. Elizabeth Angus Bracts At Different Temperature, Amru Bin Nasrulhaq Boyce
Effect Of Sucrose And Kinetin On The Quality And Vase Life Of Bougainvillea Glabra Var. Elizabeth Angus Bracts At Different Temperature, Amru Bin Nasrulhaq Boyce
Amru Bin Nasrulhaq Boyce
A study was conducted to investigate the effects of sucrose and kinetin on the post harvest quality and vase life of Bougainvillea bracts at different storage temperature. Bougainvillea bracts and flower (Bougainvillea glabra) of the same age and size were used in the experiments. Fresh bracts were continuously treated with 200 mg/l sucrose, 200mg/l kinetin and control (water) at 10 degrees C, 20 degrees C and 28 +/- 1 degrees C. It was observed that sucrose treated bracts exhibited the longest vase life compared to the control and kinetin treatments at different temperatures. The higher temperature has promoted water uptake, …
Temperature Dependent Development Of The Egg-Larval Parasitoid Chelonus Oculator On The Factitious Host, Ephestia Cautella, Hi̇lal Tunca, Cem Özkan, Ahmet Neşet Kilinçer
Temperature Dependent Development Of The Egg-Larval Parasitoid Chelonus Oculator On The Factitious Host, Ephestia Cautella, Hi̇lal Tunca, Cem Özkan, Ahmet Neşet Kilinçer
Turkish Journal of Agriculture and Forestry
Development, fecundity, and longevity of the egg-larval parasitoid Chelonus oculator Panzer (Hymenoptera: Braconidae) were studied on the factitious host, Ephestia cautella (Walker) (Lepidoptera: Pyralidae) at 4 different temperatures (15 °C, 20 °C, 25 °C, and 30 °C). Developmental time from egg to adult was inversely related to temperature. Egg to adult development time ranged from 188 days at 15 °C to 28 days at 30 °C. Complete development required 489 degree-days with a developmental threshold of 12.5 °C. Adult male and female longevity ranged from 43 days at 20 °C to 17 days at 30 °C. Maximum production of offspring …
Reactions Of The Cn Radical With Benzene And Toluene: Product Detection And Low-Temperature Kinetics, Adam J. Trevitt, Fabien Goulay, Craig A. Taatjes, David L. Osborn, Stephen R. Leone
Reactions Of The Cn Radical With Benzene And Toluene: Product Detection And Low-Temperature Kinetics, Adam J. Trevitt, Fabien Goulay, Craig A. Taatjes, David L. Osborn, Stephen R. Leone
Faculty of Science - Papers (Archive)
Low-temperature rate coefficients are measured for the CN + benzene and CN + toluene reactions using the pulsed Laval nozzle expansion technique coupled with laser-induced fluorescence detection. The CN + benzene reaction rate coefficient at 105, 165, and 295 K is found to be relatively constant over this temperature range, (3.9−4.9) × 10−10 cm3 molecule−1 s−1. These rapid kinetics, along with the observed negligible temperature dependence, are consistent with a barrierless reaction entrance channel and reaction efficiencies approaching unity. The CN + toluene reaction is measured to have a rate coefficient of 1.3 × 10−10 cm3 molecule−1 s−1 at 105 …
Effects Of Soil Temperature Regimes After Fire On Seed Dormancy And Germination In Six Australian Fabaceae Species, Victor Santana, Ross A. Bradstock, Mark Ooi, Andrew J. Denham, Tony D. Auld, M Baeza
Effects Of Soil Temperature Regimes After Fire On Seed Dormancy And Germination In Six Australian Fabaceae Species, Victor Santana, Ross A. Bradstock, Mark Ooi, Andrew J. Denham, Tony D. Auld, M Baeza
Faculty of Science - Papers (Archive)
In addition to direct fire cues such as heat, smoke and charred wood, the passage of fire leads indirectly to changes in environmental conditions which may be able to break physical dormancy in hard-coated seeds. After a fire, the open canopy and the burnt material lying on the surface alter the thermal properties of the soil, resulting in elevated soil temperatures for long periods of time. We simulated daily temperature regimes experienced at different depths of soil profile after a summer fire. Our aim was to determine whether these temperature regimes and the duration of exposure (5, 15 and 30 …
Reaction Of The C2h Radical With 1-Butyne (C4h6): Low Temperature Kinetics And Isomer-Specific Product Detection, Satchin Soorkia, Adam J. Trevitt, Talitha M. Selby, David L. Osborn, Craig A. Taatjes, Kevin R. Wilson, Stephen R. Leone
Reaction Of The C2h Radical With 1-Butyne (C4h6): Low Temperature Kinetics And Isomer-Specific Product Detection, Satchin Soorkia, Adam J. Trevitt, Talitha M. Selby, David L. Osborn, Craig A. Taatjes, Kevin R. Wilson, Stephen R. Leone
Faculty of Science - Papers (Archive)
No abstract provided.
Low Co-Cultivation Temperature At 20oc Improved Agrobacterium Tumefaciens-Mediated Transformation Of Tobacco Leaf Disks, Guiying Su
LSU Master's Theses
I investigated the effect of co-cultivation temperature and binary Ti vectors on the fresh weight yield of leaf disks of tobacco (Nicotiana tabacum L. cv. Xanthi (nn, Smith) after Agrobacterium tumefaciens-mediated transformation. I concluded that the temperature at 20ºC during co-cultivation of leaf disks with A. tumefaciens was the most critical factor on the reproducible enhancement of fresh weight yield. The highest fresh weight increase and presumably transformation efficiency was achieved under the following experimental conditions: A. tumefaciens strain LBA4404 containing pLSU binary Ti vector was grown overnight at 28oC in liquid Agrobacterium medium and the concentration was adjusted to …
Copy Number Variation Shapes Genome Diversity In Arabidopsis Over Immediate Family Generational Scales, Seth Debolt
Copy Number Variation Shapes Genome Diversity In Arabidopsis Over Immediate Family Generational Scales, Seth Debolt
Horticulture Faculty Publications
Arabidopsis thaliana is the model plant and is grown worldwide by plant biologists seeking to dissect the molecular underpinning of plant growth and development. Gene copy number variation (CNV) is a common form of genome natural diversity that is currently poorly studied in plants and may have broad implications for model organism research, evolutionary biology, and crop science. Herein, comparative genomic hybridization (CGH) was used to identify and interrogate regions of gene CNV across the A. thaliana genome. A common temperature condition used for growth of A. thaliana in our laboratory and many around the globe is 22 degrees C. …
The Contributions Of Evolutionary Divergence And Phenotypic Plasticity To Geographic Variation In The Western Fence Lizard, Sceloporus Occidentalis, Christine R. Buckley, Duncan J. Irschick, Stephen C. Adolph
The Contributions Of Evolutionary Divergence And Phenotypic Plasticity To Geographic Variation In The Western Fence Lizard, Sceloporus Occidentalis, Christine R. Buckley, Duncan J. Irschick, Stephen C. Adolph
Biology Department Faculty Publication Series
Local genetic adaptation and phenotypic plasticity are two mechanisms that can have marked effects on the morphology, performance, and behaviour of animals, producing geographic variation among populations. However, few studies have examined how these mechanisms interact during ontogeny to shape organismal phenotypes. We incubated eggs of the western fence lizard, Sceloporus occidentalis, from four populations (representing two latitudes and altitudes) in either a warm or cool environment in the laboratory. We then raised the hatchlings under common laboratory conditions, measured morphological and performance traits until 5 weeks of age, and compared juvenile morphology with that of field-caught adults from …
Pollination Behaviour Of Linum Aretioides Boiss. (Linaceae) And Its Relations With Air Temperature And Humidity, Özcan Seçmen, Aykut Güvensen, Serdar Gökhan Şenol, Sali̇h Gücel
Pollination Behaviour Of Linum Aretioides Boiss. (Linaceae) And Its Relations With Air Temperature And Humidity, Özcan Seçmen, Aykut Güvensen, Serdar Gökhan Şenol, Sali̇h Gücel
Turkish Journal of Botany
Linum aretioides Boiss., a local endemic, is distributed only on 2 mountains (İzmir: Bozdağ; Denizli: Babadağ) at the western part of Turkey between 1630 and 2300 m altitudes, above the tree line. The studies were conducted on Mount Bozdağ above the ski complex between 1750 and 2150 m, and on Mount Babadağ between 1630-2300 m both located at subalpine zones. Four 8 × 8 m quadrats on Bozdağ and 5 on Babadağ were used for the experiments. The development of reproductive structures of plants and frequency of insect visits were observed from early May to late June in 2006 and …