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Articles 1 - 17 of 17
Full-Text Articles in Entire DC Network
Effect Of Genotyping Error In Model-Free Linkage Analysis Using Microsatellite Or Single-Nucleotide Polymorphism Marker Maps, Cheryl L. Thompson, Dan Baechle, Qing Lu, George Mathew, Yeunjoo Song, Sudha K. Iyengar, Courtney Gray-Mcguire, Katrina A.B. Goddard
Effect Of Genotyping Error In Model-Free Linkage Analysis Using Microsatellite Or Single-Nucleotide Polymorphism Marker Maps, Cheryl L. Thompson, Dan Baechle, Qing Lu, George Mathew, Yeunjoo Song, Sudha K. Iyengar, Courtney Gray-Mcguire, Katrina A.B. Goddard
College of Natural and Applied Sciences
Errors while genotyping are inevitable and can reduce the power to detect linkage. However, does genotyping error have the same impact on linkage results for single-nucleotide polymorphism (SNP) and microsatellite (MS) marker maps? To evaluate this question we detected genotyping errors that are consistent with Mendelian inheritance using large changes in multipoint identity-by-descent sharing in neighboring markers. Only a small fraction of Mendelian consistent errors were detectable (e.g., 18% of MS and 2.4% of SNP genotyping errors). More SNP genotyping errors are Mendelian consistent compared to MS genotyping errors, so genotyping error may have a greater impact on linkage results …
Preliminary Survey Of The Mayflies (Ephemeroptera) And Caddisflies (Trichoptera) Of Big Bend Ranch State Park And Big Bend National Park, David E. Baumgardner, David E. Bowles
Preliminary Survey Of The Mayflies (Ephemeroptera) And Caddisflies (Trichoptera) Of Big Bend Ranch State Park And Big Bend National Park, David E. Baumgardner, David E. Bowles
College of Natural and Applied Sciences
The mayfly (Insecta: Ephemeroptera) and caddisfly (Insecta: Trichoptera) fauna of Big Bend National Park and Big Bend Ranch State Park are reported based upon numerous records. For mayflies, sixteen species representing four families and twelve genera are reported. By comparison, thirty-five species of caddisflies were collected during this study representing seventeen genera and nine families. Although the Rio Grande supports the greatest diversity of mayflies (n=9) and caddisflies (n=14), numerous spring-fed creeks throughout the park also support a wide variety of species. A general lack of data on the distribution and abundance of invertebrates in Big Bend National and State …
Arthropod Diversity And Allochthonous-Based Food Webs On Tiny Oceanic Islands, Lloyd W. Morrison
Arthropod Diversity And Allochthonous-Based Food Webs On Tiny Oceanic Islands, Lloyd W. Morrison
College of Natural and Applied Sciences
Very small islands, on the order of a few hundred square metres in area, have rarely been the focus of ecological investigations. I sampled nine such islands in the central Exumas, Bahamas for arthropod species abundance and diversity using a combination of pitfall traps, pan traps and sticky traps. Three islands had no terrestrial vegetation, three islands contained only Sesuvium portulacastrum L., a salt-tolerant perennial that had been experimentally introduced 10 years ago, and three islands supported one or two naturally occurring plant species. A relatively diverse arthropod assemblage was discovered, including representatives of 10 different orders of Crustacea and …
Hollow To Bamboolike Internal Structure Transition Observed In Carbon Nanotube Films, Y. Y. Wang, S. Gupta, R. J. Nemanich, Z. J. Liu, L. C. Qin
Hollow To Bamboolike Internal Structure Transition Observed In Carbon Nanotube Films, Y. Y. Wang, S. Gupta, R. J. Nemanich, Z. J. Liu, L. C. Qin
College of Natural and Applied Sciences
The transition of the internal structure in microwave chemical-vapor- deposited carbon nanotubes is investigated using scanning electron microscopy and high-resolution transmission electron microscopy. By controlling the thickness of the iron catalyst layer, a sequence of carbon nanotube films was obtained with diameters ranging from a few nanometers to over 100 nm. Experiments have established that by continuous reduction of the Fe layer thickness to <1 nm, single- and double-wall carbon nanotube films can be produced, whereas for an Fe film thickness <1 nm, multiwall carbon nanotube films can be synthesized. It was also found that for an Fe thickness ≥5 nm, interlayers (i.e., bamboolike or periodically compartmentalized nanotubes) were formed, while for an iron thickness <2 nm the tubes were primarily hollow. For an intermediate Fe thickness the internal structure of the carbon nanotubes was a mixture of hollow and bamboolike. A growth model which considers bulk and surface diffusions of carbon into andor onto the Fe catalyst surface is proposed to describe this transition and the internal periodic structure.
Observational Studies Of Early-Type Binary Stars: Mp Centauri, Dirk Terrell, Ulisse Munari, Tomaž Zwitter, George Wolf
Observational Studies Of Early-Type Binary Stars: Mp Centauri, Dirk Terrell, Ulisse Munari, Tomaž Zwitter, George Wolf
College of Natural and Applied Sciences
We present photometric and spectroscopic data on the early-type binary MP Centauri. The photometric data are analysed simultaneously with radial velocities to derive preliminary absolute dimensions for the binary components. Analysis of the spectra shows that the stars rotate synchronously and that the line of sight to the system crosses two kinematically sharp and well-separated interstellar reddening sources. It is shown that MP Cen consists of a B3 primary with M1 = 11.4 ± 0.4M⊙, R1 = 7.7 ± 0.1 R⊙ and a lobe-filling B6-B7 secondary with M2 = 4.4 ± 0.2 M⊙, R2 = 6.6 ± 0.1 R⊙.
Predicted Range Expansion Of The Invasive Fire Ant, Solenopsis Invicta, In The Eastern United States Based On The Vemap Global Warming Scenario, Lloyd W. Morrison, Michael D. Korzukhin, Sanford D. Porter
Predicted Range Expansion Of The Invasive Fire Ant, Solenopsis Invicta, In The Eastern United States Based On The Vemap Global Warming Scenario, Lloyd W. Morrison, Michael D. Korzukhin, Sanford D. Porter
College of Natural and Applied Sciences
The red imported fire ant, Solenopsis invicta Buren, is an invasive pest from South America that currently occupies much of the south-eastern USA. Global warming is likely to allow range expansion of many invasive species, including S. invicta. We used a dynamic, ecophysiological model of fire ant colony growth coupled with models simulating climate change to predict the potential range expansion of S. invicta in the eastern USA over the next century. The climate change scenario predicted by the Vegetation-Ecosystem Modelling and Analysis Project (VEMAP) was used in our analyses. Our predictions indicate that the habitable area for S. invicta …
Electronic Structure Of Sulfur-Modified Nanocrystalline Carbon Films, S. Gupta, B. R. Weiner, G. Morell
Electronic Structure Of Sulfur-Modified Nanocrystalline Carbon Films, S. Gupta, B. R. Weiner, G. Morell
College of Natural and Applied Sciences
The surface topography and electronic structure of sulfur-modified nanocrystalline carbon films were investigated. Using topographic image analysis it was observed that the root-mean-square roughness of the film surface and average grain size decreased with increasing sulfur incorporation either in gas or solid films. The Fermi level for undoped nanocrystalline carbon (n-C) was found just below the midgap which indicated that n-C is a weakly p-type semiconductor. The results show oscillatory behavior or peaks which was ascribed to states of the surface layer having relatively more graphitic or sp 2-bonded carbon bonds.
Pushing The Ground-Based Limit: 14-Μmag Photometric Precision With The Definitive Whole Earth Telescope Asteroseismic Data Set For The Rapidly Oscillating Ap Star Hr 1217, D. W. Kurtz, C. Cameron, M. S. Cunha, N. Dolez, G. Vauclair, E. Pallier, A. Ulla, S. O. Kepler, Michael D. Reed, For Complete List Of Authors, See Publisher's Website.
Pushing The Ground-Based Limit: 14-Μmag Photometric Precision With The Definitive Whole Earth Telescope Asteroseismic Data Set For The Rapidly Oscillating Ap Star Hr 1217, D. W. Kurtz, C. Cameron, M. S. Cunha, N. Dolez, G. Vauclair, E. Pallier, A. Ulla, S. O. Kepler, Michael D. Reed, For Complete List Of Authors, See Publisher's Website.
College of Natural and Applied Sciences
HR 1217 is one of the best-studied rapidly oscillating Ap (roAp) stars, with a frequency spectrum of alternating even- and odd-ℓ modes that are distorted by the presence of a strong, global magnetic field. Several recent theoretical studies have found that within the observable atmospheres of roAp stars the pulsation modes are magneto-acoustic with significant frequency perturbations that are cyclic with increasing frequency. To test these theories a Whole Earth Telescope extended coverage campaign obtained 342 h of Johnson B data at 10-s time resolution for the roAp star HR 1217 over 35 d with a 36 per cent duty …
Whole Earth Telescope Observations Of Bpm 37093: A Seismological Test Of Crystallization Theory In White Dwarfs, A. Kanaan, A. Nitta, D. E. Winget, S. O. Kepler, M. H. Montgomery, T. S. Metcalfe, H. Oliveira, L. Fraga, Michael D. Reed, For Complete List Of Authors, See Publisher's Website.
Whole Earth Telescope Observations Of Bpm 37093: A Seismological Test Of Crystallization Theory In White Dwarfs, A. Kanaan, A. Nitta, D. E. Winget, S. O. Kepler, M. H. Montgomery, T. S. Metcalfe, H. Oliveira, L. Fraga, Michael D. Reed, For Complete List Of Authors, See Publisher's Website.
College of Natural and Applied Sciences
BPM 37093 is the only hydrogen-atmosphere white dwarf currently known which has sufficient mass (∼1.1 M⊙) to theoretically crystallize while still inside the ZZ Ceti instability strip (Teff ∼ 12000 K). As a consequence, this star represents our first opportunity to test crystallization theory directly. If the core is substantially crystallized, then the inner boundary for each pulsation mode will be located at the top of the solid core rather than at the center of the star, affecting mainly the average period spacing. This is distinct from the "mode trapping" caused by the stratified surface layers, which modifies the pulsation …
Imaging Temperature-Dependent Field Emission From Carbon Nanotube Films: Single Versus Multiwalled, S. Gupta, Y. Y. Wang, J. M. Garguilo, R. J. Nemanich
Imaging Temperature-Dependent Field Emission From Carbon Nanotube Films: Single Versus Multiwalled, S. Gupta, Y. Y. Wang, J. M. Garguilo, R. J. Nemanich
College of Natural and Applied Sciences
Field emission properties of vertically aligned single- and multiwalled carbon nanotube films at temperatures up to 1000 °C are investigated by electron emission microscopy, enabling real-time imaging of electron emission to provide information on emission site density, the temporal variation of the emission intensity, and insight into the role of adsorbates. The nanotube films showed an emission site density of 104 ~ 105 cm2, which is compared to the areal density (from 1012 - 1013 cm2 to 108 - 109 cm2). At ambient temperature, the emission indicated temporal fluctuation (~6%-8%) in emission current with minimal changes in the emission pattern. …
Gardening In A Bag: A Viable Alternative For Growing Bedding Plants In The Landscape, Clydette M. Alsup, Pamela A. Trewatha
Gardening In A Bag: A Viable Alternative For Growing Bedding Plants In The Landscape, Clydette M. Alsup, Pamela A. Trewatha
College of Agriculture
The rocky Ozarks soils make it difficult for some homeowners to establish ornamental gardens. An alternative to digging in rocky soils is planting into bags of potting soil. This study evaluated "Gardening in a Bag" for herbaceous bedding plants. The growth and appearance of Alternanthera, Capisum annuum, Dianthus, Gazania, Tagetes `Wave', and upright petunias, Salvia splendens, Spilanthes, Verbena, and Catharanthus roseus were evaluated in 2002 under two planting methods: in the ground vs. in bags of potting soil. Wave petunias, Dianthus, C. roseus, and Portulacagrandiflora were evaluated in 2003. All plants were mulched with 3 inches of coarse sawdust. In …
Air Flow Technique For Large Scale Dispersion And Alignment Of Carbon Nanotubes On Various Substrates, James Hedberg, Lifeng Dong, Jun Jiao
Air Flow Technique For Large Scale Dispersion And Alignment Of Carbon Nanotubes On Various Substrates, James Hedberg, Lifeng Dong, Jun Jiao
College of Natural and Applied Sciences
Herein we present a method to disperse and align carbon nanotubes on various substrate surfaces. Using the shear forces associated with a rapidly moving fluid, nanoscale objects were positioned in a direction corresponding to the flow vector of the fluid. Dispersion of carbon nanotubes on microaddressable electrodes via the gas flow method creates opportunities for scaling up the production of nanoscale devices. In this letter, we demonstrate the feasibility of the method and the electrical characterization results obtained after the fabrication of carbon nanotube testing structures.
Local False Discovery Rate And Minimum Total Error Rate Approaches To Identifying Interesting Chromosomal Regions, Ritwik Sinha, Moumita Sinha, George Mathew, Robert C. Elston, Yugun Luo
Local False Discovery Rate And Minimum Total Error Rate Approaches To Identifying Interesting Chromosomal Regions, Ritwik Sinha, Moumita Sinha, George Mathew, Robert C. Elston, Yugun Luo
College of Natural and Applied Sciences
The simultaneous testing of a large number of hypotheses in a genome scan, using individual thresholds for significance, inherently leads to inflated genome-wide false positive rates. There exist various approaches to approximating the correct genomewide p-values under various assumptions, either by way of asymptotics or simulations. We explore a philosophically different criterion, recently proposed in the literature, which controls the false discovery rate. The test statistics are assumed to arise from a mixture of distributions under the null and non-null hypotheses. We fit the mixture distribution using both a nonparametric approach and commingling analysis, and then apply the local false …
Step-Pool Morphology Of A Wilderness Headwater Stream Of The Buffalo River, Arkansas, Aaron M. Nickolotsky
Step-Pool Morphology Of A Wilderness Headwater Stream Of The Buffalo River, Arkansas, Aaron M. Nickolotsky
MSU Graduate Theses
Step-pool and cascade morphology reflect the geological and climatic factors affecting channels in mountain watersheds. This study uses longitudinal and cross-section surveys of a headwater stream in the Boston Mountains of the Ozarks Plateau region in northwest Arkansas to describe channel form and develop quantitative models for comparisons with other regions. The Bowers Hollow Creek watershed (3.5 km2) is located within the boundaries of the Forest Service’s Upper Buffalo Wilderness Area. Step-pool morphology varies with the influence of lithology and sediment supply in the Boston Mountains. However, step height and wavelength relationships are generally similar to other regions. Distribution of …
Mercury Contamination Of Channel And Floodplain Sediments In Wilson Creek Watershed, Southwest Missouri, Willard E. Rodgers Ii
Mercury Contamination Of Channel And Floodplain Sediments In Wilson Creek Watershed, Southwest Missouri, Willard E. Rodgers Ii
MSU Graduate Theses
Mercury (Hg) is a pollutant affecting aquatic environments and human health world wide. Sediments in urban streams can store Hg from historical industrial waste releases in channel and floodplain deposits. Subsequent erosion of these deposits can remobilize sediment-bound Hg impacting downstream receiving waters. This study describes the distribution of Hg in floodplain and channel sediments of Wilson Creek and its tributaries using geochemical sediment analysis and cesium-137 dating. The upper Wilson Creek watershed drains the southern two-thirds of Springfield, Missouri. Results indicate that Hg concentrations in overbank and active channel sediments along the entire stream length are elevated above the …
Two-Neutron Transfer In The He6+Bi209 Reaction Near The Coulomb Barrier, P. A. Deyoung, Patrick J. Mears, J. J. Kolata, E. F. Aguilera, F. D. Becchetti, Y. Chen, M. Cloughesy, Scott R. Jones, J. A. Zimmerman, For Complete List Of Authors, See Publisher's Website.
Two-Neutron Transfer In The He6+Bi209 Reaction Near The Coulomb Barrier, P. A. Deyoung, Patrick J. Mears, J. J. Kolata, E. F. Aguilera, F. D. Becchetti, Y. Chen, M. Cloughesy, Scott R. Jones, J. A. Zimmerman, For Complete List Of Authors, See Publisher's Website.
College of Natural and Applied Sciences
The cross section for α-particle emission in the He6+Bi209 reaction at energies near the Coulomb barrier is remarkably large. Possible reactions that may produce the observed αparticles include two-neutron transfer, one-neutron transfer, and direct projectile breakup. Each of these mechanisms results in a distinctive angular correlation between the αparticle and the outgoing neutron(s). A neutron-α-particle coincidence experiment was performed to study two-neutron transfer to unbound states of Bi211. It is shown that approximately 55% of the observed α-particle yield at and beyond the grazing angle is because of this process. This is more than 2.5 times the fraction attributable to …
Geospatial Analysis Of Gravel Bar Deposition And Channel Migration Within The Ozark National Scenic Riverways, Missouri (1955-2003), Derek J. Martin
Geospatial Analysis Of Gravel Bar Deposition And Channel Migration Within The Ozark National Scenic Riverways, Missouri (1955-2003), Derek J. Martin
MSU Graduate Theses
Historical land clearing is believed to be responsible for present-day channel instability in main stem reaches in the Ozark National Scenic Riverways (ONSR) in south-central Missouri. The nature of instability is related to the delivery of excess amounts of gravel sediment to stream channels and higher rates of lateral bank erosion. These conditions are of concern to resource managers because of the potential damaging effects on recreational facilities and aquatic habitat. The purpose of this study is to develop a geographic information systems (GIS)/remote sensing (RS) based methodology to monitor spatial patterns of gravel deposition and lateral channel migration within …