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Particulate Organic Carbon Fluxes Along Upwelling‐Dominated Continental Margins: Rates And Mechanisms, Robert Thunell, Claudia R. Benitez-Nelson, Ramon Varela, Yrene Astor, Frank Muller‐Karger Mar 2007

Particulate Organic Carbon Fluxes Along Upwelling‐Dominated Continental Margins: Rates And Mechanisms, Robert Thunell, Claudia R. Benitez-Nelson, Ramon Varela, Yrene Astor, Frank Muller‐Karger

Faculty Publications

[1] Time series sediment trap samples were used to examine the rates and mechanisms of particulate organic carbon (POC) flux at three continental margin locations, Santa Barbara Basin, Cariaco Basin, and Guaymas Basin, marked by seasonal upwelling and high primary production. The mean POC flux in Santa Barbara Basin (0.096 g m−2 d−1) is nearly twice that of Cariaco Basin and 4 times higher than that in Guaymas Basin, with all three sites having POC fluxes significantly higher than the open ocean average (0.007 g m−2 d−1). In Cariaco Basin, the only site with available primary production numbers, there is …

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Submarine Volcanic Morphology Of The Western Galapagos Based On Em300 Bathymetry And Mr1 Side-Scan Sonar, Jennifer B. Glass, D J. Fornari, Hillary F. Hall, Allison A. Cougan, Heidi A. Berkenbosch, Mark L. Holmes, Scott M. White, Giorgio De La Torre Mar 2007

Submarine Volcanic Morphology Of The Western Galapagos Based On Em300 Bathymetry And Mr1 Side-Scan Sonar, Jennifer B. Glass, D J. Fornari, Hillary F. Hall, Allison A. Cougan, Heidi A. Berkenbosch, Mark L. Holmes, Scott M. White, Giorgio De La Torre

Faculty Publications

A compilation of high-resolution EM300 multibeam bathymetric and existing MR1 side-scan sonar data was used to investigate the volcanic morphology of the flanks of the western Galapagos Islands. The data portray an assortment of constructional volcanic features on the shallow to deep submarine flanks of Fernandina, Isabela, and Santiago Islands, including rift zones and groups of cones that are considered to be the primary elements in constructing the archipelagic apron. Ten submarine rift zones were mapped, ranging in length from 5 to 20 km, comparable in length to western Canary Island rift zones but significantly shorter than Hawaiian submarine rift …

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Geochemistry Of Martian Soil And Bedrock In Mantled And Less Mantled Terrains With Gamma Ray Data From Mars Odyssey, Horton E. Newsom, Larry S. Crumpler, Robert C. Reedy, Michael T. Petersen, Gary C. Newsom, Larry G. Evans, G. Jeffrey Taylor, John M. Keller, Daniel M. Janes, William V. Boynton, Kris E. Kerry, Suniti Karunatillake Mar 2007

Geochemistry Of Martian Soil And Bedrock In Mantled And Less Mantled Terrains With Gamma Ray Data From Mars Odyssey, Horton E. Newsom, Larry S. Crumpler, Robert C. Reedy, Michael T. Petersen, Gary C. Newsom, Larry G. Evans, G. Jeffrey Taylor, John M. Keller, Daniel M. Janes, William V. Boynton, Kris E. Kerry, Suniti Karunatillake

Faculty Publications

Surficial materials, including soil and dust, are abundant in the upper tens of centimeters of the Martian surface sensed by the Mars Odyssey Gamma Ray Spectrometer (GRS). Seven large areas (14% of the Martian surface) that represent possible compositional end-members were selected, including three regions heavily mantled with surficial materials. The selection process included mapping the ratio of exposed rocky terrain to surficial materials using high-resolution imagery. GRS data for H, Cl, Fe, Si, K, and Th were obtained for each area. The areas are chemically homogeneous within each area, given the spatial resolution and analytical uncertainty of the GRS …

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Distinct Iron Binding Property Of Two Putative Iron Donors For The Iron-Sulfur Cluster Assembly: Isca And The Bacterial Frataxin Ortholog Cyay Under Physiological And Oxidative Stress Conditions, Huangen Ding, Juanjuan Yang, Liana C. Coleman, Simon Yeung Mar 2007

Distinct Iron Binding Property Of Two Putative Iron Donors For The Iron-Sulfur Cluster Assembly: Isca And The Bacterial Frataxin Ortholog Cyay Under Physiological And Oxidative Stress Conditions, Huangen Ding, Juanjuan Yang, Liana C. Coleman, Simon Yeung

Faculty Publications

Frataxin, a small mitochondrial protein linked to the neurodegenerative disease Friedreich ataxia, has recently been proposed as an iron donor for the iron-sulfur cluster assembly. An analogous function has also been attributed to IscA, a key member of the iron-sulfur cluster assembly machinery found in bacteria, yeast, and humans. Here we have compared the iron binding property of IscA and the frataxin ortholog CyaY from Escherichia coli under physiological and oxidative stress conditions. In the presence of the thioredoxin reductase system, which emulates the intracellular redox potential, CyaY fails to bind any iron even at a 10-fold excess of iron …

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Hydatellaceae Identified As A New Branch Near The Base Of The Angiosperm Phylogenetic Tree, Jeffery M. Saarela, Hardeep S. Rai, James A. Doyle, Peter K. Endress, Sarah Mathews, Adam D. Marchant, Barbara G. Briggs, Sean W. Graham Mar 2007

Hydatellaceae Identified As A New Branch Near The Base Of The Angiosperm Phylogenetic Tree, Jeffery M. Saarela, Hardeep S. Rai, James A. Doyle, Peter K. Endress, Sarah Mathews, Adam D. Marchant, Barbara G. Briggs, Sean W. Graham

Faculty Publications

Although the relationship of angiosperms to other seed plants remains controversial, great progress has been made in identifying the earliest extant splits in flowering-plant phylogeny, with the discovery that the New Caledonian shrub Amborella trichopoda, the water lilies (Nymphaeales), and the woody Austrobaileyales constitute a basal grade of lines that diverged before the main radiation in the clade. By focusing attention on these ancient lines, this finding has re-written our understanding of angiosperm structural and reproductive biology, physiology, ecology and taxonomy. The discovery of a new basal lineage would lead to further re-evaluation of the initial angiosperm radiation, but would …

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Nmr Structural Characterization Of Substrates Bound To N-Acetylglucosaminyltransferase V, Megan A. Macnaughtan, Maria Kamar, Gerardo Alvarez-Manilla, Andre Venot, John Glushka, J. Michael Pierce, James H. Prestegard Mar 2007

Nmr Structural Characterization Of Substrates Bound To N-Acetylglucosaminyltransferase V, Megan A. Macnaughtan, Maria Kamar, Gerardo Alvarez-Manilla, Andre Venot, John Glushka, J. Michael Pierce, James H. Prestegard

Faculty Publications

N-Acetylglucosaminyltransferase V (GnT-V) is an enzyme involved in the biosynthesis of asparagine-linked oligosaccharides. It is responsible for the transfer of N-acetylglucosamine (GlcNAc) from the nucleotide sugar donor, uridine 5'-diphospho-N-acetylglucosamine (UDP-GlcNAc), to the 6 position of the α-1-6 linked Man residue in N-linked oligosaccharide core structures. GnT-V up-regulation has been linked to increased cancer invasiveness and metastasis and, appropriately, targeted for drug development. However, drug design is impeded by the lack of structural information on the protein and the way in which substrates are bound. Even though the catalytic domain of this type II membrane protein can be expressed in mammalian …

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The Modulation Of Stat5a/Gr Complexes During Fat Cell Differentiation And In Mature Adipocytes, James E. Baugh, Z. Elizabeth Floyd, Jacqueline M. Stephens Mar 2007

The Modulation Of Stat5a/Gr Complexes During Fat Cell Differentiation And In Mature Adipocytes, James E. Baugh, Z. Elizabeth Floyd, Jacqueline M. Stephens

Faculty Publications

Objective: Signal transducer and activator of transcription (STAT) 5A has been shown to interact with the glucocorticoid receptor (GR) in adipocytes. The aim of this study was to investigate the subcellular locations and modulation of STAT5A/GR complexes during adipogenesis and in mature adipocytes. Research Methods and Procedures: Both 3T3-L1 and 3T3-F442A cells were studied by performing subcellular fractionations, immunoprecipitation, and Western blotting after various treatments. Results: The formation of nuclear STAT5A/GR complexes was regulated in the cytosol and in the nucleus at distinct times during adipogenesis and in mature adipocytes. STAT5A, but not STAT5B, forms a complex with GR in …

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Landscape Context Outweighs Local Habitat Quality In Its Effects On Herbivore Dispersal And Distribution, Kyle J. Haynes, Forrest P. Dillemuth, Bryan J. Anderson, Alyssa S. Hakes, Heather B. Jackson, S. Elizabeth Jackson, James T. Cronin Mar 2007

Landscape Context Outweighs Local Habitat Quality In Its Effects On Herbivore Dispersal And Distribution, Kyle J. Haynes, Forrest P. Dillemuth, Bryan J. Anderson, Alyssa S. Hakes, Heather B. Jackson, S. Elizabeth Jackson, James T. Cronin

Faculty Publications

Past studies with spatially structured herbivore populations have emphasized the primacy of intrinsic factors (e.g., patch quality), patch geometry (e.g., patch size and isolation), and more recently landscape context (e.g., matrix composition) in affecting local population abundance and dispersal rate. However, few studies have examined the relative importance of each factor, or how they might interact to affect herbivore abundance or dispersal. Here, we performed a factorial field experiment to examine the independent and interactive effects of patch quality (plant biomass, leaf protein, leaf phenolics) and matrix composition [mudflat or non-host grass (Bromus inermis)] on planthopper (Prokelisia crocea) emigration from …

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A Genetic Screen Supports A Broad Role For The Drosophila Insulator Proteins Beaf-32a And Beaf-32b In Maintaining Patterns Of Gene Expression, Swarnava Roy, Yian Yee Tan, Craig M. Hart Mar 2007

A Genetic Screen Supports A Broad Role For The Drosophila Insulator Proteins Beaf-32a And Beaf-32b In Maintaining Patterns Of Gene Expression, Swarnava Roy, Yian Yee Tan, Craig M. Hart

Faculty Publications

Chromatin domain insulators are thought to insulate adjacent genes, including their regulatory elements, from each other by organizing chromatin into functionally independent domains. Thus insulators should play a global role in gene regulation by keeping regulatory domains separated. However, this has never been demonstrated. We previously designed and characterized a transgene that is under GAL4 UAS control and encodes a dominant-negative form of the Boundary Element-Associated Factors BEAF-32A and BEAF-32B. The BID transgene encodes the BEAF self-interaction domain but lacks a DNA binding domain. Expression of BID in eye imaginal discs leads to a rough eye phenotype. Here we screen …

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Alkalilimnicola Ehrlichii Sp. Nov., A Novel, Arsenite-Oxidizing Haloalkaliphilic Gammaproteobacterium Capable Of Chemoautotrophic Or Heterotrophic Growth With Nitrate Or Oxygen As The Electron Acceptor, Shelley E. Hoeft, Jodi Switzer Blum, John F. Stolz, F. Robert Tabita, Brian Witte, Gary M. King, Joanne M. Santini, Ronald S. Oremland Mar 2007

Alkalilimnicola Ehrlichii Sp. Nov., A Novel, Arsenite-Oxidizing Haloalkaliphilic Gammaproteobacterium Capable Of Chemoautotrophic Or Heterotrophic Growth With Nitrate Or Oxygen As The Electron Acceptor, Shelley E. Hoeft, Jodi Switzer Blum, John F. Stolz, F. Robert Tabita, Brian Witte, Gary M. King, Joanne M. Santini, Ronald S. Oremland

Faculty Publications

A facultative chemoautotrophic bacterium, strain MLHE-1T, was isolated from Mono Lake, an alkaline hypersaline soda lake in California, USA. Cells of strain MLHE-1T were Gram-negative, short motile rods that grew with inorganic electron donors (arsenite, hydrogen, sulfide or thiosulfate) coupled with the reduction of nitrate to nitrite. No aerobic growth was attained with arsenite or sulfide, but hydrogen sustained both aerobic and anaerobic growth. No growth occurred when nitrite or nitrous oxide was substituted for nitrate. Heterotrophic growth was observed under aerobic and anaerobic (nitrate) conditions. Cells of strain MLHE-1T could oxidize but not grow on CO, while CH4 neither …

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A Mobile Element-Based Evolutionary History Of Guenons (Tribe Cercopithecini), Jinchuan Xing, Hui Wang, Yuhua Zhang, David A. Ray, Anthony J. Tosi, Todd R. Disotell, Mark A. Batzer Mar 2007

A Mobile Element-Based Evolutionary History Of Guenons (Tribe Cercopithecini), Jinchuan Xing, Hui Wang, Yuhua Zhang, David A. Ray, Anthony J. Tosi, Todd R. Disotell, Mark A. Batzer

Faculty Publications

Background: Guenons (tribe Cercopithecini) are a species-rich group of primates that have attracted considerable attention from both primatologists and evolutionary biologists. The complex speciation pattern has made the elucidation of their relationships a challenging task, and many questions remain unanswered. SINEs are a class of non-autonomous mobile elements and are essentially homoplasy-free characters with known ancestral states, making them useful genetic markers for phylogenetic studies. Results: We identified 151 novel Alu insertion loci from 11 species of tribe Cercopithecini, and used these insertions and 17 previously reported loci to infer a phylogenetic tree of the tribe Cercopithecini. Our results robustly …

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Human Genomic Dna Quantitation System, H-Quant: Development And Validation For Use In Forensic Casework, Jaiprakash G. Shewale, Elaine Schneida, Jonathan Wilson, Jerilyn A. Walker, Mark A. Batzer, Sudhir K. Sinha Mar 2007

Human Genomic Dna Quantitation System, H-Quant: Development And Validation For Use In Forensic Casework, Jaiprakash G. Shewale, Elaine Schneida, Jonathan Wilson, Jerilyn A. Walker, Mark A. Batzer, Sudhir K. Sinha

Faculty Publications

The human DNA quantification (H-Quant) system, developed for use in human identification, enables quantitation of human genomic DNA in biological samples. The assay is based on real-time amplification of AluYb8 insertions in hominoid primates. The relatively high copy number of subfamily-specific Alu repeats in the human genome enables quantification of very small amounts of human DNA. The oligonucleotide primers present in H-Quant are specific for human DNA and closely related great apes. During the real-time PCR, the SYBR® Green I dye binds to the DNA that is synthesized by the human-specific AluYb8 oligonucleotide primers. The fluorescence of the bound SYBR® …

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Requirement Of Nhp6 Proteins For Transcription Of A Subset Of Trna Genes And Heterochromatin Barrier Function In Saccharomyces Cerevisiae, Priscilla Braglia, Sandra L. Dugas, David Donze, Giorgio Dieci Mar 2007

Requirement Of Nhp6 Proteins For Transcription Of A Subset Of Trna Genes And Heterochromatin Barrier Function In Saccharomyces Cerevisiae, Priscilla Braglia, Sandra L. Dugas, David Donze, Giorgio Dieci

Faculty Publications

A key event in tRNA gene (tDNA) transcription by RNA polymerase (Pol) III is the TFIIIC-dependent assembly of TFIIIB upstream of the transcription start site. Different tDNA upstream sequences bind TFIIIB with different affinities, thereby modulating tDNA transcription. We found that in the absence of Nhp6 proteins, the influence of the 5′-flanking region on tRNA gene transcription is dramatically enhanced in Saccharomyces cerevisiae. Expression of a tDNA bearing a suboptimal TFIIIB binding site, bat not of a tDNA preceded by a strong TFIIIB binding region, was strongly dependent on Nhpf6 in vivo. Upstream sequence-dependent stimulation of tRNA gene transcription by …

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Novel Free Ceramides As Components Of The Soldier Defense Gland Of The Formosan Subterranean Termite (Coptotermes Formosanus), Masaya Ohta, Fumito Matsuura, Gregg Henderson, Roger A. Laine Mar 2007

Novel Free Ceramides As Components Of The Soldier Defense Gland Of The Formosan Subterranean Termite (Coptotermes Formosanus), Masaya Ohta, Fumito Matsuura, Gregg Henderson, Roger A. Laine

Faculty Publications

Of the lipid extracts of the defense secretion from the Formosan subterranean termite, Coptotermes formosanus Shiraki, on high-performance thin-layer chromatography analysis, no glycolipids or phospholipids were detected, but free fatty acids and three novel ceramides were found (termed TL-1, TL-2, and TL-3). Free fatty acids were confirmed to be lignoceric acid (C24:0) and hexacosanoic acid (C26:0), as described previously [Chen, J., G. Henderson, and R. A. Laine. 1999. Lignoceric acid and hexacosanoic acid: major components of soldier frontal gland secretions of the Formosan subterranean termite (Coptotermes formosanus). J. Chem. Ecol. 25: 817-824]. TL-1, TL-2, and TL-3 were characterized as ceramides …

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Tools For Evaluating Lipolexis Oregmae (Hymenoptera: Aphidiidae) In The Field: Effects Of Host Aphid And Host Plant On Mummy Location And Color Plus Improved Methods For Obtaining Adults, Raghuwinder Singh, Marjorie A. Hoy Mar 2007

Tools For Evaluating Lipolexis Oregmae (Hymenoptera: Aphidiidae) In The Field: Effects Of Host Aphid And Host Plant On Mummy Location And Color Plus Improved Methods For Obtaining Adults, Raghuwinder Singh, Marjorie A. Hoy

Faculty Publications

Lipolexis oregmae Gahan was introduced into Florida in a classical biological control program directed against the brown citrus aphid, Toxoptera citricida (Kirkaldy), on citrus. Prior to evaluating distribution, host range, and potential nontarget effects of L. oregmae in Florida, we evaluated the role of other potential host aphids and host plants on mummy production and location. Under laboratory conditions, this parasitoid produced the most progeny on the target pest, the brown citrus aphid on citrus. This parasitoid, unlike the majority of aphidiids, did not produce mummies on any of the host plants tested when reared in black citrus aphid T. …

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Analysis Of A Decade In Library Literature: 1994-2004, Kelly D. Blessinger, Michelle Frasier-Robinson Mar 2007

Analysis Of A Decade In Library Literature: 1994-2004, Kelly D. Blessinger, Michelle Frasier-Robinson

Faculty Publications

The purpose of this study was to analyze trends in publication and citation in library and information science journals over a decade (1994-2004) of the literature. This examination revealed the areas of concentration within the research, frequently published subjects through the years, and the characteristics of the top-cited authors and resources during this time. This information allows those in the field to follow the trends in publication, gives researchers the tools to determine which journals might give their work the most exposure and recognition, and can help libraries to make collection management decisions in this subject area.

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Mobile Element-Based Forensic Genomics, David A. Ray, Jerilyn A. Walker, Mark A. Batzer Mar 2007

Mobile Element-Based Forensic Genomics, David A. Ray, Jerilyn A. Walker, Mark A. Batzer

Faculty Publications

Mobile elements are commonly referred to as selfish repetitive DNA sequences. However, mobile elements represent a unique and underutilized group of molecular markers. Several of their characteristics make them ideally suited for use as tools in forensic genomic applications. These include their nature as essentially homoplasy-free characters, they are identical by descent, the ancestral state of any insertion is known to be the absence of the element, and many mobile element insertions are lineage specific. In this review, we provide an overview of mobile element biology and describe the application of certain mobile elements, especially the SINEs and other retrotransposons, …

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Distribution Of The Hiv Resistance Ccr5-Δ32 Allele Among Egyptians And Syrians, Abdel Halim Salem, Mark A. Batzer Mar 2007

Distribution Of The Hiv Resistance Ccr5-Δ32 Allele Among Egyptians And Syrians, Abdel Halim Salem, Mark A. Batzer

Faculty Publications

A mutant allele of the β-chemokine receptor gene CCR5 bearing a 32-basepair (bp) deletion that prevents cell invasion by the primary transmitting strain of HIV-1 has recently been characterized. Individuals homozygous for the mutation are resistant to infection, even after repeated high-risk exposure, but this resistance appears not absolute, as isolated cases of HIV-positive deletion homozygotes are emerging. The consequence of the heterozygous state is not clear, but it may delay the progression to AIDS in infected individuals. In order to evaluate the frequency distribution of CCR5-Δ32 polymorphism among Egyptians, a total of 200 individuals (154 from Ismailia and 46 …

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Production Of F1 Interspecies Hybrid Offspring With Cryopreserved Sperm From A Live-Bearing Fish, The Swordtail Xiphophorus Helleri, Huiping Yang, Leona Hazlewood, Sheila J. Heater, Paula A. Guerrero, Ronald B. Walter, Terrence R. Tiersch Mar 2007

Production Of F1 Interspecies Hybrid Offspring With Cryopreserved Sperm From A Live-Bearing Fish, The Swordtail Xiphophorus Helleri, Huiping Yang, Leona Hazlewood, Sheila J. Heater, Paula A. Guerrero, Ronald B. Walter, Terrence R. Tiersch

Faculty Publications

Despite study of sperm cryopreservation in more than 200 fish species, production of broods from cryopreserved sperm in live-bearing fish has not been demonstrated. This has not been due to a lack of effort, but instead is a result of the unique morphology, biology, and biochemistry of reproduction in viviparous fishes. For example, sperm of Xiphophorus helleri have a cylindrical nucleus, can swim for days after being activated, have glycolytic capabilities, and can reside in the female reproduction tract for months before fertilization. These traits are not found in fishes with external fertilization. The long-standing research use of the genus …

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Early Out-Of-Season Induced Spawning Of Channel Catfish Ictalurus Punctatus (Rafinesque) Conditioned In Heated Earthen Ponds, R. Paul Lang, Terrence R. Tiersch Mar 2007

Early Out-Of-Season Induced Spawning Of Channel Catfish Ictalurus Punctatus (Rafinesque) Conditioned In Heated Earthen Ponds, R. Paul Lang, Terrence R. Tiersch

Faculty Publications

This study documents early out-of-season induced spawning of channel catfish Ictalurus punctatus. During the early spring (February-April) of 1999, 2000 and 2001, ponds containing (1) male and female channel catfish (mixed-sex ponds) or (2) male channel and blue catfish I. furcatus only, or female channel catfish only (single-sex ponds) were heated to 24-30°C to encourage gonadal maturation and spawning. Unheated ponds were stocked with males and females and were monitored during the duration of heating. When natural spawning occurred in the heated ponds, the fish were captured by seining and unspawned females were injected with 100 μg kg-1 of synthetic …

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First Record Of A Sleeper Shark In The Western Gulf Of Mexico And Comments On Taxonomic Uncertainty Within Somniosus (Somniosus), George W. Benz, Eric R. Hoffmayer, William B. Driggers, Dan Allen, Lougan E. Bishop, David A. Brown Mar 2007

First Record Of A Sleeper Shark In The Western Gulf Of Mexico And Comments On Taxonomic Uncertainty Within Somniosus (Somniosus), George W. Benz, Eric R. Hoffmayer, William B. Driggers, Dan Allen, Lougan E. Bishop, David A. Brown

Faculty Publications

A sleeper shark, Somniosus (Somniosus) sp., is reported from Alaminos Canyon in the western Gulf of Mexico at a depth of about 2647 m based on observations made using a remotely operated vehicle. This is the first record of a sleeper shark (Somniosus, Somniosidae) from the western Gulf of Mexico and deepest record of any shark from the Gulf of Mexico. Despite claims to the contrary in the literature, no taxonomic character has been identified to date that can be used to unequivocally identify all representatives of Somniosus (Somniosus), and as a result, some species records must be considered dubious.

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Anxiety Sensitivity And Retaliatory Aggressive Behavior In Research Volunteers, Joshua J. Broman-Fulks, Michael S. Mccloskey, Mitchell E. Berman Mar 2007

Anxiety Sensitivity And Retaliatory Aggressive Behavior In Research Volunteers, Joshua J. Broman-Fulks, Michael S. Mccloskey, Mitchell E. Berman

Faculty Publications

An important focus of recent aggression research has been to identify personality variables that influence the expression of aggression. One such variable may be anxiety sensitivity (AS). Individuals high in AS fear unpleasant anxiety-related physiological sensations and perhaps physiological arousal in general. Accordingly, people high in AS are motivated to avoid situations that produce these sensations. With respect to aggressive encounters, an intense attack by an opponent involves significant physiological arousal. High anxiety-sensitive individuals may therefore attempt to decrease the intensity of the interaction by responding in a non-aggressive or conciliatory manner. To test this possibility, 112 community volunteers completed …

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Grass Shrimp (Palaemonetes Spp.) Play A Pivotal Trophic Role In Enhancing Ruppia Maritima, Donna Drury Mccall, Chet R. Rakocinski Mar 2007

Grass Shrimp (Palaemonetes Spp.) Play A Pivotal Trophic Role In Enhancing Ruppia Maritima, Donna Drury Mccall, Chet R. Rakocinski

Faculty Publications

Coupled trophic-engineer interactions are potentially important for maintaining habitat function and ecosystem services. As ephemeral submerged aquatic vegetation (SAV), Ruppia maritima has a short well-defined growth-senescence cycle and should benefit from any ecological interaction that enhances its physical condition and longevity. Grass shrimp (Palaemonetes spp.) are abundant facultative grazers of epiphytic algae and conveyors of nutrients in tidal marsh and SAV habitats. Grass shrimp addition consistently enhanced Ruppia biomass and shoot density in a series of three field experiments conducted in Grand Bay National Estuarine Research Reserve, Mississippi, USA. In two experiments, epiphyte grazing by grass shrimp enhanced Ruppia by …

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Federated Searching: Do Undergraduates Prefer It And Does It Add Value?, C. Jeffrey Belliston, Jared L. Howland Mar 2007

Federated Searching: Do Undergraduates Prefer It And Does It Add Value?, C. Jeffrey Belliston, Jared L. Howland

Faculty Publications

PDF of Powerpoint Presentation on federated searching. This presentation was given at the National ACRL Virtual Conference in Baltimore, Maryland.

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A Coarse Grain Model For Dna, Thomas A. Knotts, Nitin Rathore, David C. Schwartz, Juan J. De Pablo Feb 2007

A Coarse Grain Model For Dna, Thomas A. Knotts, Nitin Rathore, David C. Schwartz, Juan J. De Pablo

Faculty Publications

Understanding the behavior of DNA at the molecular level is of considerable fundamental and engineering importance. While adequate representations of DNA exist at the atomic and continuum level, there is a relative lack of models capable of describing the behavior of DNA at mesoscopic length scales. We present a mesoscale model of DNA that reduces the complexity of a nucleotide to three interactions sites, one each for the phosphate, sugar, and base, thereby rendering the investigation of DNA up to a few microns in length computationally tractable. The charges on these sites are considered explicitly. The model is parametrized using …

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A Coarse Grain Model For Dna, Thomas A. Knotts Iv, Nitin Rathore, David C. Schwartz, Juan J. De Pablo Feb 2007

A Coarse Grain Model For Dna, Thomas A. Knotts Iv, Nitin Rathore, David C. Schwartz, Juan J. De Pablo

Faculty Publications

Understanding the behavior of DNA at the molecular level is of considerable fundamental and engineering importance. While adequate representations of DNA exist at the atomic and continuum level, there is a relative lack of models capable of describing the behavior of DNA at mesoscopic length scales. We present a mesoscale model of DNA that reduces the complexity of a nucleotide to three interactions sites, one each for the phosphate, sugar, and base, thereby rendering the investigation of DNA up to a few microns in length computationally tractable. The charges on these sites are considered explicitly. The model is parametrized using …

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The Psbq Protein Defines Cyanobacterial Photosystem Ii Complexes With Highest Activity And Stability, Johnna L. Roose, Yasuhiro Kashino, Himadri B. Pakrasi Feb 2007

The Psbq Protein Defines Cyanobacterial Photosystem Ii Complexes With Highest Activity And Stability, Johnna L. Roose, Yasuhiro Kashino, Himadri B. Pakrasi

Faculty Publications

Light-induced conversion of water to molecular oxygen by Photosystem II (PSII) is one of the most important enzymatic reactions in the biosphere. PSII is a multisubunit membrane protein complex with numerous associated cofactors, but it continually undergoes assembly and disassembly due to frequent light-mediated damage as a result of its normal function. Thus, at any instant, there is heterogeneity in the subunit compositions of PSII complexes within the cell. In particular, cyanobacterial PSII complexes have five associated extrinsic proteins, PsbO, PsbP, PsbQ, PsbU, and PsbV. However, little is known about the interactions of the more recently identified PsbQ protein with …

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Timescale Dependence Of Environmental And Plant‐Mediated Controls On Ch4 Flux In A Temperate Fen, Claire C. Treat, Jill L. Bubier, Ruth K. Varner, Patrick M. Crill Feb 2007

Timescale Dependence Of Environmental And Plant‐Mediated Controls On Ch4 Flux In A Temperate Fen, Claire C. Treat, Jill L. Bubier, Ruth K. Varner, Patrick M. Crill

Faculty Publications

This study examined daily, seasonal, and interannual variations in CH4 emissions at a temperate peatland over a 5‐year period. We measured net ecosystem CO2 exchange (NEE), CH4 flux, water table depth, peat temperature, and meteorological parameters weekly from the summers (1 May to 31 August) of 2000 through 2004 at Sallie's Fen in southeastern New Hampshire, United States. Significant interannual differences, driven by high variability of large individual CH4 fluxes (ranging from 8.7 to 3833.1 mg CH4 m−2 d−1) occurring in the late summer, corresponded with a decline in water table level and an increase in air and peat temperature. …

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Evaluating The Impact On Users From Implementing A Course Management System, Charles R. Graham, Meghan M. Kennedy, Gregory L. Waddoups, Richard E. West Feb 2007

Evaluating The Impact On Users From Implementing A Course Management System, Charles R. Graham, Meghan M. Kennedy, Gregory L. Waddoups, Richard E. West

Faculty Publications

Nearly all colleges and universities are using some form of e-learning system, usually an expensive course management system (CMS), to create online course offerings or to enhance regular, classroom-oriented courses. Our university has invested a large amount of resources into purchasing and supporting one of the two most popular CMS vendors, and it has become imperative to understand what the effects from using this technology have been, as well as how we can improve the integration of this and other educational technologies into different instructional contexts. This project, through a combination of surveys, call-log analysis, and interviews, was used to …

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Degradation Of Stat5 Proteins In 3t3-L1 Adipocytes Is Induced By Tnf-Α And Cycloheximide In A Manner Independent Of Stat5a Activation, Z. Elizabeth Floyd, Brant M. Segura, Fang He, Jacqueline M. Stephens Feb 2007

Degradation Of Stat5 Proteins In 3t3-L1 Adipocytes Is Induced By Tnf-Α And Cycloheximide In A Manner Independent Of Stat5a Activation, Z. Elizabeth Floyd, Brant M. Segura, Fang He, Jacqueline M. Stephens

Faculty Publications

Tumor necrosis factor-α (TNF-α) is a multifunctional cytokine that has been implicated as a causative factor in obesity-linked insulin resistance. It is commonly accepted that macrophage-derived TNF-α acts in a paracrine manner on adjacent adipocytes to inhibit the expression of various adipocyte genes and to attenuate insulin signaling. Several studies have revealed that signal transducer and activator of transcription (STAT)5 proteins are modulated during adipogenesis and can modulate the transcription of some adipocyte genes. In this study, we demonstrate that TNF-α treatment, in the presence of cycloheximide, also results in the rapid turnover of STAT5A and STAT5B in a process …

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