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2005

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Potential Consequences Of The Coqui Frog Invasion In Hawaii, Karen H. Beard, William C. Pitt Jan 2005

Potential Consequences Of The Coqui Frog Invasion In Hawaii, Karen H. Beard, William C. Pitt

United States Department of Agriculture Wildlife Services: Staff Publications

The Puerto Rican frog, Eleutherodactylus coqui , has invaded Hawaii and has negatively impacted the state’s multimillion dollar floriculture, nursery and tourist industries; however, little is known about the ecological consequences of the invasion. Using data from Puerto Rico and Hawaii, the authors summarize the potential consequences of the invasion and describe future research needs. It could be predicted that the coqui would reduce the abundance of Hawaii’s endemic invertebrates. However, data suggest that coquis are mostly consuming non-native invertebrates, and not invertebrate pests, such as mosquitoes and termites. Endemic invertebrates are likely to represent a portion of the coqui …

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Transformation Of Maize With The P1 Transcription Factor Directs Production Of Silk Maysin, A Corn Earworm Resistance Factor, In Concordance With A Hierarchy Of Floral Organ Pigmentation, Suzy M. Cocciolone, Dan Nettleton, Maurice E. Snook, Thomas Peterson Jan 2005

Transformation Of Maize With The P1 Transcription Factor Directs Production Of Silk Maysin, A Corn Earworm Resistance Factor, In Concordance With A Hierarchy Of Floral Organ Pigmentation, Suzy M. Cocciolone, Dan Nettleton, Maurice E. Snook, Thomas Peterson

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The maize p1 gene encodes an R2R3-MYB transcription factor that controls the biosynthesis of red flavonoid pigments in floral tissues of the maize plant. Genetic and quantitative trait locus analyses have also associated the p1 gene with the synthesis of maysin, a flavone glycoside from maize silks that confers natural resistance to corn earworm. Here, we show directly that the p1 gene induces maysin accumulation in silk tissues. Transformation of maize plants that had low or no silk maysin with p1 transgenes elevated silk maysin concentrations to levels sufficient for corn earworm abiosis. The p1 transgenes also conferred red pigment …

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Grazing Evaluation Of Big Bluestems Bred For Improved Forage Yield And Digestibility, R. B. Mitchell, Kenneth P. Vogel, T. J. Klopfenstein, B. E. Anderson, R. A. Masters Jan 2005

Grazing Evaluation Of Big Bluestems Bred For Improved Forage Yield And Digestibility, R. B. Mitchell, Kenneth P. Vogel, T. J. Klopfenstein, B. E. Anderson, R. A. Masters

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Two big bluestem (Andropogon gerardii Vitman) strains (Pawnee C3 and Kaw C3) developed by three breeding cycles for increased forage yield and in vitro dry matter digestibility (IVDMD) were compared with the base populations of 'Pawnee' and 'Kaw' in a 3-yr grazing trial. Pastures were seeded in May 1998 near Mead, NE. Experimental units were three 0.4-ha pastures of each strain or cultivar in a randomized complete block design. Pastures were burned and fertilized with ammonium nitrate at 112 kg N ha-1 in the spring of 2000, 2001, and 2002 before grazing. Each pasture was continuously stocked with …

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Insect Fragments In Flour: Relationship To Lesser Grain Borer (Coleoptera: Bostrichidae) Infestation Level In Wheat And Rapid Detection Using Near-Infrared Spectroscopy, Joel Perez-Mendoza, James E. Throne, Elizabeth B. Maghirang, Floyd E. Dowell, James E. Baker Jan 2005

Insect Fragments In Flour: Relationship To Lesser Grain Borer (Coleoptera: Bostrichidae) Infestation Level In Wheat And Rapid Detection Using Near-Infrared Spectroscopy, Joel Perez-Mendoza, James E. Throne, Elizabeth B. Maghirang, Floyd E. Dowell, James E. Baker

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

We determined that the number of insect fragments, quantified using the standard flotation method, in flour milled from wheat infested with larvae, pupae, or preemergent adults of the lesser grain borer, Rhyzopertha dominica (F.), was proportional to infestation level. Wheat infested with a single preemergent adult contributed 28 and 10X as many fragments as wheat infested with a single larva or pupa, respectively. Using regression models that were developed from these data, we predicted that the maximum infestation level that would result in flour with fragment counts below the Food and Drug Administration defect action level (75 fragments/50 g of …

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The Southern Hebrew In Faulkner's Go Down , Moses : Rereading The Old Testament, Luke Duncan Jan 2005

The Southern Hebrew In Faulkner's Go Down , Moses : Rereading The Old Testament, Luke Duncan

Electronic Theses and Dissertations

No abstract provided.

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Improving Scalability For Networked Virtual Environments, Darko Milovanovic Jan 2005

Improving Scalability For Networked Virtual Environments, Darko Milovanovic

Electronic Theses and Dissertations

No abstract provided.

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All Nite Lon, D. Allan Mitchell Jan 2005

All Nite Lon, D. Allan Mitchell

Electronic Theses and Dissertations

No abstract provided.

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Analysis Of Seepage Erosion Of Streambank Sediment Using Soil Lysimeters, Raja K. Periketi Jan 2005

Analysis Of Seepage Erosion Of Streambank Sediment Using Soil Lysimeters, Raja K. Periketi

Electronic Theses and Dissertations

No abstract provided.

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Art, Aesthetics, And Ecology : Creating A High School Curriculum, Ashley Elizabeth Kalemjian Jan 2005

Art, Aesthetics, And Ecology : Creating A High School Curriculum, Ashley Elizabeth Kalemjian

Electronic Theses and Dissertations

No abstract provided.

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Performance Improvement And Drag Reduction Of Aircrafts By Boundary Layer Control Using A Flexible Composite Surface Deturbulator (Fcsd), Sundeep Vijay Ravande Jan 2005

Performance Improvement And Drag Reduction Of Aircrafts By Boundary Layer Control Using A Flexible Composite Surface Deturbulator (Fcsd), Sundeep Vijay Ravande

Electronic Theses and Dissertations

No abstract provided.

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The Concept Of Justice In Mediation: A Psychobiography, Ellen Waldman Jan 2005

The Concept Of Justice In Mediation: A Psychobiography, Ellen Waldman

Cardozo Journal of Conflict Resolution

Discussions of what justice means in mediation have a dialectical quality to them. At various points in the field's history, the notion that justice in mediation consists of fully maximized disputant self-determination holds sway. At other historical moments, a tentative consensus appears to recognize that justice in mediation requires normative content independent of the disputants' beliefs and values.

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Carrion Beetles (Coleoptera: Silphidae) Of The Konza Prairie Biological Station, David A. Rintoul, Laura M. Krueger, Chari Woodard, James E. Throne Jan 2005

Carrion Beetles (Coleoptera: Silphidae) Of The Konza Prairie Biological Station, David A. Rintoul, Laura M. Krueger, Chari Woodard, James E. Throne

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Pitfall traps were used to determine diversity, seasonality, and numbers of burying beetles on the Konza Prairie Biological Station (KPBS) during the summers of 1997 and 1998. Traps were baited with either beef liver (1997) or whole mouse carcasses (1997 and 1998); significantly more carrion beetles were found in traps baited with carcasses. A total of 1003 carrion beetles, representing 8 species, were trapped over the course of 1556 trap nights. One of these species, Necrophila americana Linneaus, had not previously been recorded in Riley County. One additional species was found at sites where pitfall trap bait was discarded, …

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Trichinella Nativa In A Black Bear From Plymouth, New Hampshire, D.E. Hill, H.R. Gamble, D.S. Zarlenga, C. Cross, J. Finnigan Jan 2005

Trichinella Nativa In A Black Bear From Plymouth, New Hampshire, D.E. Hill, H.R. Gamble, D.S. Zarlenga, C. Cross, J. Finnigan

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

A suspected case of trichinellosis was identified in a single patient by the New Hampshire Public Health Laboratories in Concord, NH. The patient was thought to have become infected by consumption of muscle larvae (ML) in undercooked meat from a black bear killed in Plymouth, NH in October 2003 and stored frozen at 􏰀20 8C fro 4 months. In January 2004, a 600 g sample of the meat was thawed at 4 8C, digested in hydrochloric acid and pepsin, and larvae were collected by sedimentation. Intact, coiled, and motile ML were recovered (366 larvae per gram (lpg) of tissue), which …

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Isolation And Characterization Of A Bovine Visceral Endoderm Cell Line Derived From A Parthenogenetic Blastocyst, Neil C. Talbot, Thomas J. Caperna, Anne M. Powell, Alan D. Ealy, Le Ann Blomberg, Wesley M. Garrett Jan 2005

Isolation And Characterization Of A Bovine Visceral Endoderm Cell Line Derived From A Parthenogenetic Blastocyst, Neil C. Talbot, Thomas J. Caperna, Anne M. Powell, Alan D. Ealy, Le Ann Blomberg, Wesley M. Garrett

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

A cell line, BPE-1, was derived from a parthenogenetic 8-d in vitro-produced bovine blastocyst that produced a cell outgrowth on STO feeder cells. The BPE-1 cells resembled visceral endoderm previously cultured from blastocysts produced by in vitro fertilization (IVF). Analysis of the BPE-1 cells demonstrated that they produced serum proteins and were negative for interferon-tau production (a marker of trophectoderm). Transmission electron microscopy revealed that the cells were a polarized epithelium connected by complex junctions resembling tight junctions in conjunction with desmosomes. Rough endoplasmic reticulum was prominent within the cells as were lipid vacuoles. Immunocytochemistry indicated the BPE-1 cells …

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Evaluation Of Oviposition Substrates And Organic Infusions On Collection Of Culex In Florida, Sandra Allan, Ulrich R. Bernier, David Kline Jan 2005

Evaluation Of Oviposition Substrates And Organic Infusions On Collection Of Culex In Florida, Sandra Allan, Ulrich R. Bernier, David Kline

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Gravid mosquito traps are commonly used for both arbovirus surveillance and population surveillance of mosquitoes of the genus Culex. Oviposition substrates, used as baits in these traps, were tested against Culex under laboratory and field conditions. In the laboratory all substrates tested as 1% and 10% dilutions in 2-choice bioassays against female Cx. quinquefascians were significantly more effective than well water controls in eliciting oviposition. Strongest responses were to dilutions of dairy effluent, followed by larval water and infusions of alfalfa hay, alfalfa pellets, Bermuda hay, oak leaves, and Typha leaves, with lowest responses to cow manure infusion. …

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Laboratory Evaluation Of Mosquito Traps Baited With A Synthetic Human Odor Blend To Capture Aedes Aegypti, Ivoneide M. Silva, Alvaro E. Eiras, Daniel L. Kline, Ulrich R. Bernier Jan 2005

Laboratory Evaluation Of Mosquito Traps Baited With A Synthetic Human Odor Blend To Capture Aedes Aegypti, Ivoneide M. Silva, Alvaro E. Eiras, Daniel L. Kline, Ulrich R. Bernier

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

A synthetic blend of chemicals comprising volatiles released by the human body has been shown to be an effective attractant for female Aedes aegypti in olfactometer bioassays with laboratory-reared mosquitoes. We report the laboratory evaluation of Ae. aegypti response to a synthetic blend tested with 4 types of mosquito traps (CDC model 512, CDC model 1012, CFG, and Fay–Prince traps). Aedes aegypti females were attracted significantly by the blend. The higher release rate of attractant (320.2 ± 10.71 mg/h) more efficiently attracted mosquitoes than the lower release rate (42.0 ± 2.3 mg/h). Although both the Fay–Prince and CFG traps caught …

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Plant Availability Of Phosphorus In Swine Slurry And Cattle Feedlot Manure, Bahman Eghball, Brian J. Wienhold, Bryan L. Woodbury, Roger A. Eigenberg Jan 2005

Plant Availability Of Phosphorus In Swine Slurry And Cattle Feedlot Manure, Bahman Eghball, Brian J. Wienhold, Bryan L. Woodbury, Roger A. Eigenberg

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

To utilize manure P for crop production, P release and plant availability needs to be quantified. An incubation study was conducted to determine P availability from swine (Sus scrofa) and cattle (Bos taurus) feedlot manure in three soils. Treatments for each manure included temperature (11, 18, 25, and 32°C), water regime [constant 60% water-filled pore space (WFPS) vs. four dry-down cycles of 60 to 30% WFPS], time, and soils (Catlin silt loam, Sharpsburg silty clay loam, and Valentine fine sand). In another study, synthetic P fertilizer was used to determine the fraction of P that becomes …

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Changes In Soil Attributes Following Low Phosphorus Swine Slurry Application To No-Tillage Sorghum, Brian J. Wienhold Jan 2005

Changes In Soil Attributes Following Low Phosphorus Swine Slurry Application To No-Tillage Sorghum, Brian J. Wienhold

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Swine (Sus scrofa) slurry can serve as an excellent fertilizer source. Application at rates to meet crop N requirements can result in excess soil P due to low manure N/P ratios. Low phytate corn (LPC) (Zea mays L.) stores a greater proportion of P as phosphate than does traditional corn (TC) increasing bioavailability of P in pig feed grain. Improved utilization of feed P reduces P concentration in manure and soil P accumulation. However, the potential effects of LPC manure on other soil properties are not known. Changes in soil attributes over 3 yr were compared for …

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Influence Of Dietary Crude Protein Concentration And Source On Potential Ammonia Emissions From Beef Cattle Manure, N. A. Cole, R. N. Clark, R. W. Todd, C. R. Richardson, A. Gueye, L. W. Greene, K. Mcbride Jan 2005

Influence Of Dietary Crude Protein Concentration And Source On Potential Ammonia Emissions From Beef Cattle Manure, N. A. Cole, R. N. Clark, R. W. Todd, C. R. Richardson, A. Gueye, L. W. Greene, K. Mcbride

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Emissions of ammonia, as well as other gases and particulates, to the atmosphere are a growing concern of livestock producers, the general public, and regulators. The concentration and ruminal degradability of CP in beef cattle diets may affect urinary and fecal excretion of N and thus may affect ammonia emissions from beef cattle feed yards. To determine the effects of dietary CP concentration and degradability on potential ammonia emissions, 54 steers were randomly assigned to nine dietary treatments in a 3 × 3 factorial arrangement of treatments. Treatments consisted of three dietary CP concentrations (11.5, 13, and 14.5%) and three …

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Involvement Of Acetosyringone In Plant–Pathogen Recognition, C. Jacyn Baker, Norton M. Mock, Bruce D. Whitaker, Daniel P. Roberts, Clifford P. Rice, Kenneth L. Deahl, Andrey A. Aver'yanov Jan 2005

Involvement Of Acetosyringone In Plant–Pathogen Recognition, C. Jacyn Baker, Norton M. Mock, Bruce D. Whitaker, Daniel P. Roberts, Clifford P. Rice, Kenneth L. Deahl, Andrey A. Aver'yanov

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

In this study, acetosyringone was identified as one of the major extracellular phenolics in tobacco suspension cells and was shown to have bioactive properties that influence early events in plant–bacterial pathogenesis. In our model system, tobacco cell suspensions treated with bacterial isolate Pseudomonas syringae WT (HR+) undergo a resistant interaction characterized by a burst in oxygen uptake several hours after inoculation. When the extracellular concentration of acetosyringone in tobacco cell suspensions was supplemented with exogenous acetosyringone, the burst in oxygen uptake occurred as much as 1.5 h earlier. The exogenous acetosyringone had no effect on tobacco suspensions undergoing susceptible interactions …

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Apoplastic Redox Metabolism: Synergistic Phenolic Oxidation And A Novel Oxidative Burst, C. Jacyn Baker, Daniel P. Roberts, Norton M. Mock, Bruce D. Whitaker, Kenneth L. Deahl, Andrey A. Aver'yanov Jan 2005

Apoplastic Redox Metabolism: Synergistic Phenolic Oxidation And A Novel Oxidative Burst, C. Jacyn Baker, Daniel P. Roberts, Norton M. Mock, Bruce D. Whitaker, Kenneth L. Deahl, Andrey A. Aver'yanov

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The plant apoplast is an important mediator of communication between the cell cytoplasm and its surroundings. Plant cell suspensions offer a convenient model system to gain insight into apoplastic physiology. Here, we describe a novel phenomenon that took place when two naturally occurring phenolics were added together to either soybean or tobacco cell suspensions. Acetosyringone (AS) and/or hydroxyacetophenone (HAP), phenolics found in the extracellular/apoplast of tobacco cells, were added to soybean or tobacco cell suspensions undergoing an oxidative burst. Individually, AS appeared to be utilized as a typical peroxidase substrate to scavenge hydrogen peroxide, while HAP was utilized at a …

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Induction Of Redox Sensitive Extracellular Phenolics During Plant–Bacterial Interactions, C. Jacyn Baker, Bruce D. Whitaker, Daniel P. Roberts, Norton M. Mock, Clifford P. Rice, Kenneth L. Deahl, Andrey A. Aver'yanov Jan 2005

Induction Of Redox Sensitive Extracellular Phenolics During Plant–Bacterial Interactions, C. Jacyn Baker, Bruce D. Whitaker, Daniel P. Roberts, Norton M. Mock, Clifford P. Rice, Kenneth L. Deahl, Andrey A. Aver'yanov

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

This study focuses on the transient and complex nature of phenolics that accumulate in the extracellular environment of plant suspension cells during the first few hours of the interaction between these plant cells and bacterial pathogens. Using suspension cells of Nicotiana tabacum we identified four acetophenones and four hydroxycinnamic acid amides that accumulate in this extracellular environment. Treatment of the suspension cells with isolates of the plant pathogen Pseudomonas syringae or heat-killed bacteria increased elicitation of extracellular phenolics and changed the composition of the compounds that accumulated. These phenolics were sensitive to oxidative stress; when suspension cells were treated with …

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Lamb Production Of Dorper, Katahdin, And St. Croix Bred In Summer, Winter, Or Spring In The Southeastern United States, J. M. Burke Jan 2005

Lamb Production Of Dorper, Katahdin, And St. Croix Bred In Summer, Winter, Or Spring In The Southeastern United States, J. M. Burke

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Ewe production traits and ability to breed out of season were compared for the Dorper (DO), Katahdin (KA), and St. Croix (SC) breeds between 2000 and 2005. Sheep were managed on grass pasture and were supplemented with corn/soybean meal and free-choice, trace-mineral mix. Ewes were exposed to rams of their respective breeds in late summer (August/September), winter (December), or spring (April/ May) for 30-day breeding periods. Lambs were weighed at birth and 60 days of age. Pregnancy and lambing rates and litter birth weight were greater for all breeds bred in winter and lowest in spring. Pregnancy losses were greater …

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Feedlot Performance And Carcass Characteristics Of Lambs Sired By Texel, Romanov, St. Croix Or Dorset Rams From Polypay And St. Croix Ewes, W. A. Phillips, M. A. Brown, H. G. Dolezal, G. Q. Fitch Jan 2005

Feedlot Performance And Carcass Characteristics Of Lambs Sired By Texel, Romanov, St. Croix Or Dorset Rams From Polypay And St. Croix Ewes, W. A. Phillips, M. A. Brown, H. G. Dolezal, G. Q. Fitch

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Over a 2-year period, crossbred lambs resulting from the mating of Texel (T), Romanov (R), and St. Croix (S) rams with Polypay (P) and S ewes, were finished during the summer and late fall to determine feedlot performance and carcass characteristics. A total of 175 wether lambs of the five genotypes (R x P, R x S, S x S, T x P and T x S) were fed a high-energy diet for an average of 110 d (Experiment 1). Purebred St. Croix lambs weighed less (P < 0.05) at the beginning and end of the finishing period, had the lowest average daily gain (ADG) (P < 0.05), and the lowest Gain:Feed (P < 0.10) of the five genotypes evaluated. All five genotypes produced carcasses with a quality grade ≥ Choice. In a subsequent 2-year experiment (Experiment 2), 251 lambs sired by either Dorset or St. Croix rams from the ewes created in Exp.1 were used. Dorset-sired lambs were heavier (P < 0.10) at the end of the feeding period and had greater ADG (P < 0.10) than lambs sired by St. Croix rams. Wether lambs were heavier (P < 0.10), grew faster (P < 0.10) and ate more (P<0.05) feed than female lambs. Lambs from crossbred ewes were heavier (P <0.05) at the beginning and end of the finishing period and grew faster (P < 0.10) than lambs from purebred St. Croix ewes. When Dorset rams were used as the terminal sire, lamb feedlot performance was similar among the five ewe genotypes used in this study.

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Growth Performance Of Barbados Blackbelly, Katahdin And St. Croix Hair Sheep Lambs Fed Pasture- Or Hay-Based Diets, S. Wildeus, K. E. Turner, J. R. Collins Jan 2005

Growth Performance Of Barbados Blackbelly, Katahdin And St. Croix Hair Sheep Lambs Fed Pasture- Or Hay-Based Diets, S. Wildeus, K. E. Turner, J. R. Collins

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Two experiments evaluated growth of mixed-sex Barbados Blackbelly, Katahdin, and St. Croix hair sheep lambs raised on pasture or hay-based diets with moderate levels of energy supplementation. In Experiment 1, 36 ewe and wether lambs were allocated to a pasture or pen feeding group in May. Pasture animals rotationally grazed tall fescue pasture, while pen animals were offered chopped alfalfa hay, and both groups were supplemented with corn/soybean meal at 0.75% of body weight. In Experiment 2, 72 lambs were allocated to pen and pasture in April, and provided either a low or high crude protein concentration corn/soybean meal supplement …

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Composition Of Irrigation Water Salinity Affects Growth Characteristics And Uptake Of Selenium And Salt Ions By Soybean, D. Wang, C. M. Grieve, D. L. Suarez Jan 2005

Composition Of Irrigation Water Salinity Affects Growth Characteristics And Uptake Of Selenium And Salt Ions By Soybean, D. Wang, C. M. Grieve, D. L. Suarez

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

A greenhouse study was conducted to determine the effects of irrigation waters differing in salt composition on growth characteristics, salt ion and selenium (Se) accumulation, and distribution in plant components of the soybean (Glycine max L. Merr.) cultivar “Manokin.” Plants were grown in sand cultures and irrigated with isoosmotic solutions containing (1) Cl− as the dominant anion, or (2) a mixture of salts containing equal molar amounts of SO2-4  and Cl−. Six treatments of each salinity type were imposed. Electrical conductivities of the irrigation waters ranged from 2.1 to 13.0 dSm−1. Selenium …

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The Eagleville Times, Volume 3, Issue 1, Debbie Ryan Jan 2005

The Eagleville Times, Volume 3, Issue 1, Debbie Ryan

Eagleville Times

No abstract provided.

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Silencing Of Retrotransposons In Dictyostelium By Dna Methylation And Rnai, Markus Kuhlmann, Branimira E. Borisova, Markus Kaller, Pontus Larsson, Dirk Stach, Jianbo Na, Ludwig Eichinger, Frank Lyko, Victor Ambros, Fredrik Soderbom, Christian Hammann, Wolfgang Nellen Jan 2005

Silencing Of Retrotransposons In Dictyostelium By Dna Methylation And Rnai, Markus Kuhlmann, Branimira E. Borisova, Markus Kaller, Pontus Larsson, Dirk Stach, Jianbo Na, Ludwig Eichinger, Frank Lyko, Victor Ambros, Fredrik Soderbom, Christian Hammann, Wolfgang Nellen

Dartmouth Scholarship

We have identified a DNA methyltransferase of the Dnmt2 family in Dictyostelium that was denominated DnmA. Expression of the dnmA gene is downregulated during the developmental cycle. Overall DNA methylation in Dictyostelium is ∼0.2% of the cytosine residues, which indicates its restriction to a limited set of genomic loci. Bisulfite sequencing of specific sites revealed that DnmA is responsible for methylation of mostly asymmetric C-residues in the retrotransposons DIRS-1 and Skipper. Disruption of the gene resulted in a loss of methylation and in increased transcription and mobilization of Skipper. Skipper transcription was also upregulated in strains that had genes encoding …

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Presuppositions In Moral Education Discourse: Developing An Analytic Framework And Applying It To Moral Education Traditions, Maria Sciaino Jan 2005

Presuppositions In Moral Education Discourse: Developing An Analytic Framework And Applying It To Moral Education Traditions, Maria Sciaino

Electronic Theses and Dissertations

Moral education is ever more important in our schools today, but the various moral education traditions make it difficult to decide which tradition best serves our purpose and population. This dissertation develops and uses an original analytic framework to narrow the choices of moral education curricula. The analytic framework introduced presuppositions that expounded upon one's center of value or source of moral authority, the nature of people and their capacity for rational thought, the nature of society, the time orientation of tradition, and the resulting morality in action. The analytic framework was then applied to ten notable traditions: Catholic religious …

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How Does The Use Of Picture Books During Instruction Improve Student Word Choice In Writing?, Laurie Anne Mcadams Jan 2005

How Does The Use Of Picture Books During Instruction Improve Student Word Choice In Writing?, Laurie Anne Mcadams

Electronic Theses and Dissertations

The purpose of my research was to determine how the use of picture books during instruction would improve student word choice in writing. Donald Graves (2003), a renowned researcher in the teaching of writing, states, "All children need . . . to be surrounded with poetry, stories, information books, biography, science and history, imaginative and factual books." Graves' research presents successful classroom instruction when teachers incorporate literature as a fundamental part of their reading and writing instruction. Likewise, Susan Anderson McElveen and Connie Campbell Dierking (2000) conducted a study with their students using picture books as "precise examples" to teach …

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