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Search Results: 1 - 10 of 461760 matches for " A. Alton "
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Search for light-to-heavy quark flavor changing neutral currents in $ν _μN$ and $\barν_μN$ scattering at the Tevatron
A. Alton
Physics , 2000, DOI: 10.1103/PhysRevD.63.012001
Abstract: We report on a search for flavor-changing neutral-currents (FCNC) in the production of heavy quarks in deep inelastic $\nu_{\mu}N$ and $\bar{\nu}% _{\mu}N$ scattering by the NuTeV experiment at the Fermilab Tevatron. This measurement, made possible by the high-purity NuTeV sign-selected beams, probes for FCNC in heavy flavors at the quark level and is uniquely sensitive to neutrino couplings of potential FCNC mediators. All searches are consistent with zero, and limits on the effective mixing strengths $% | V_{uc}| ^{2}$, $| V_{db}| ^{2}$, and $| V_{sb}| ^{2}$ are obtained.
Observation of neutral current charm production in $ν_μFe$ scattering at the Tevatron
A. Alton
Physics , 2000, DOI: 10.1103/PhysRevD.64.012002
Abstract: We report on the first observation of open charm production in neutral current deep inelastic neutrino scattering as seen in the NuTeV detector at Fermilab. The production rate is shown to be consistent with a pure gluon-$% Z^{0}$ boson production model, and the observed level of charm production is used to determine the effective charm mass. As part of our analysis, we also obtain a new measurement for the proton-nucleon charm production cross section at $\sqrt{s}=38.8$ GeV.
Review of "Advances in Silicon Carbide Processing and Applications" 1st Edition by Steven E. Saddow and Anant Agarwal
Alton Horsfall
BioMedical Engineering OnLine , 2005, DOI: 10.1186/1475-925x-4-33
Abstract: After the introductory chapter one the growth and potential market of silicon carbide wafers, is suitable for those people who are new to the field of SiC and offers a strong background to support the remainder of the material presented in the later chapters. The indication that the market forces for SiC power electronics will be in the 300V plus market however, goes against the significant inroads made by both Infineon [3] and Cree [4] into the switch mode power supply market for domestic customers. This is followed by a chapter which focuses on the technological requirements of implantation and annealing for the production of the selectively doped regions required for device fabrication. With the crystal lattice of SiC being particularly dense, the damage caused by ion implantation is severe and significantly degrades the carrier mobilities in these regions. The chapter provides a thorough review of the techniques being used to investigate the extent of this damage and the measures being used to minimise it in device structures.The chapters at the rear of the book focus on the development of power transistors (both MOSFETS and bipolars) and their suitability for replacing silicon based power devices in power electronic circuitry, as would be suitable for propulsion systems. Because SiC devices offer the possibility of operation with junction temperatures substantially above the 175°C limit associated with Si power devices, they can be operated without the need of heavy and cumbersome heat sinks. This, along with their higher efficiency makes them particularly suitable for mobile propulsion systems. The material properties of SiC also make it suitable for the fabrication of high power radio frequency devices, such as IMPATT diodes and bipolar transistors and the final section shows the recent research in this area which offers a potentially lucrative market for SiC devices as they offer superior properties in comparison to silicon.The remaining chapter focuses on t
L1 in the L2 Classroom. Yeah or Nay?
Dave Alton
Humanising Language Teaching , 2013, DOI: 17559715
The Active Management of Postpartum Uterine Atony—A Checklist Based Approach  [PDF]
Rachael Bailey, Michael R. Foley, Nicole Hall, Adiel Fleischer, Mary D’Alton, Gary A. Dildy, Michael A. Belfort, Gary D. Hankins, Steven L. Clark
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.611081
Abstract: Uterine atony remains the major cause of postpartum hemorrhage, and of death from postpartum hemorrhage in the United States. While existing guidelines outlining a general approach to postpartum hemorrhage are useful, recent data suggest that greater specificity may be necessary to significantly impact mortality. We present a highly specific and methodical approach to the management of uterine atony, which addresses what we believe to be the most common cause of preventable maternal hemorrhagic death in the US—lack of an intensive, focused approach to atony and perseverance with therapies that are not working. This protocol should result in cessation of hemorrhage by medical or surgical means within 1 hour of diagnosis. We then apply this protocol to a number of illustrative cases of maternal death due to atony. An approach involving the active management of uterine atony may assist clinicians in avoiding severe morbidity and mortality from uterine atony.
Pulmonary lymphangitic carcinomatosis presenting as severe interstitial lung disease in a 15-year-old female
F.J. Gilchrist,H. Alton,M-A Brundler,L. Edwards
European Respiratory Review , 2011,
Dimensional crossover of a frustrated distorted kagome Heisenberg Model: Application to FeCrAs
Travis E. Redpath,John M. Hopkinson,Alton A. Leibel,Hae-Young Kee
Physics , 2011,
Abstract: Motivated by recent experimental work on FeCrAs, we study the magnetic properties of classical spin models on the hexagonal Fe$_2$P/ZrNiAl structure (space group $P{\bar{6}}2m$). When both transition metal/rare earth sites carry magnetic moments, one has alternating distorted kagome and triangular lattice layers. Each point of the triangular lattice lies at the centre of a distorted hexagon and actually corresponds to three isolated magnetic atoms: a "trimer". We show that a simple model consisting of antiferromagnetically correlated Heisenberg spins on the frustrated distorted kagome lattice coupling either ferromagnetically or antiferromagnetically to Heisenberg spins at the average position of a trimer, leads to a rich phase diagram, including the possible selection of a $(1/3,1/3,0)$ magnetic order as may have been seen in FeCrAs.
Molecular Regulation of the Metabolic Pathways of the Medicinal Plants: Phyla dulcis  [PDF]
Godson O. Osuji, Aruna Weerasooriya, Peter A. Y. Ampim, Laura Carson, Paul Johnson, Yoonsung Jung, Eustace Duffus, Sela Woldesenbet, Sanique South, Edna Idan, Dewisha Johnson, Diadrian Clarke, Billy Lawton, Alfred Parks, Ali Fares, Alton Johnson
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.611171
Abstract: Phyla (Lippia) dulcis contains hernundulcin sesquiterpene zero-caloric sweetener that is about a thousand times sweeter than sucrose, and also bitter constituents including camphor and limonene. There is yet no simple method to remove the undesirable constituents. The yield of sweetener hernundulcin is very low, and there is no simple method to maximize its composition. The aim of the project was to characterize the mRNA targets that regulate the primary and terpenoid metabolic enzymes of P. dulcis. Restriction fragment differential display polymerase chain reaction of P. dulcis glutamate dehydrogenase-synthesized RNA showed that many mRNAs encoding β-caryophyllene, (+)-epi-α-bisabolol, bicyclogermacrene, bifunctional sesquiterpene, and geraniol synthases shared sequence homologies with ribulose-1,5-bisphophatase carboxylase, granule-bound starch synthase, pyruvate kinase, glucose-6-phosphate dehydrogenase, and phosphoenol pyruvate carboxylase. Sequence similarities between mRNAs encoding primary metabolic enzymes and terpene synthases suggested that photosynthesis could regulate terpenoid metabolism in order to increase the yield of sweetener hernundulcin.
Enhancement of the Essential Amino Acid Composition of Food Crop Proteins through Biotechnology  [PDF]
Godson O. Osuji, Eustace Duffus, Paul Johnson, Sela Woldesenbet, Aruna Weerasooriya, Peter A. Y. Ampim, Laura Carson, Yoonsung Jung, Sanique South, Edna Idan, Dwiesha Johnson, Diadrian Clarke, Billy Lawton, Alfred Parks, Ali Fares, Alton Johnson
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.619302
Abstract: Lack of essential amino acids (EAA) in the diet of at-risk populations could beget a state of food insecurity. Plant proteins are deficient in some essential amino acids. Animals obtain EAA from plant sources. Simple biotechnologies are being developed for improving the EAA composition of crop proteins. The aim was to integrate-discriminate glycolysis and citric-glyoxylic acid cycles to optimize biosynthesis of EAA in food crops. Permutation of diverse metabolic pathways at the mRNA level by glutamate dehydrogenase (GDH)-synthesized RNA is a common biotechnology for doubling the nutritious compositions of plants. Peanuts were planted in plots and treated with mineral salts mixed according to stoichiometric ratios. Protein-bounded and free amino acids of mature peanut seeds were determined by HPLC. GDH-synthesized RNA probes homologous to the mRNAs encoding glyceraldehyde-3-phosphate dehydrogenase (GAPDH), phosphoglycerate mutase (PGlycM), phosphoenolpyruvate carboxylase (PEPCase), enolase, malate dehydrogenase (MDH), isocitrate lyase (ICL), and malate synthase (MS) were prepared from peanut seeds using restriction fragment double differential display PCR method. Northern assays of peanut total RNA showed that the mRNAs encoding PGlycM, PEPCase, MDH, and MS shared extensive sequence homologies that produced a dense network of cross-talks, resulting to co-differential silencing of the mRNAs thereby permuting glycolysis, citric-glyoxylic acid cycles. There were 42 permutations in the NPPKtreated, 105 in control, 420 in KN-, and NPKS-treated peanuts. Because of permutations involving the mRNAs encoding ICL and MS, wherever the abundances of these mRNAs were high (control, and NPPK-treated peanuts) the concentrations of the α-ketoglutarate group of total glutamate, glutamine, arginine, proline, and histidine were minimized (<7.0 mg/g) but the concentrations of the oxaloacetate group of total aspartate, lysine, methionine, threonine, and isoleucine were maximized (>28.0 mg/g). The integration of glycolysis, citric and glyoxylic acid cycles increased the quality and doubled the concentrations of the protein-bounded EAA composition of NPPK-treated (33.37 mg/g) compared with the control peanut (15.66 mg/g). The commanding biotechnology was the stoichiometric mineral salts-based induction of GDH to synthesize the RNAs that integrated glycolysis, citric-glyoxylic acid cycles to one functional unit.
Race in the Bahamas: A Dysfunctional Narrative
Russell, Keith Alton
College of the Bahamas Research Journal , 2009,
Abstract: This essay addresses the ways in which the conversation about race in The Bahamas is predicated upon avoidance, obfuscation, and incoherence. Further, it critiques some traditional and sacred narratives concerning the protracted problems of race in the Bahamian archipelago. Then, briefly, it examines the historical circumstances which gave rise to the present paralysis, and offers suggestions on how to move forward towards “one Bahamas”, thus overcoming the obvious racial divide, and simultaneously, healing some old wounds too long left to fester.
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