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Search Results: 1 - 10 of 221657 matches for " Karina C. Krasomil-Osterfeld "
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The Entomopathogenic Bacterial Endosymbionts Xenorhabdus and Photorhabdus: Convergent Lifestyles from Divergent Genomes
John M. Chaston, Garret Suen, Sarah L. Tucker, Aaron W. Andersen, Archna Bhasin, Edna Bode, Helge B. Bode, Alexander O. Brachmann, Charles E. Cowles, Kimberly N. Cowles, Creg Darby, Limaris de Léon, Kevin Drace, Zijin Du, Alain Givaudan, Erin E. Herbert Tran, Kelsea A. Jewell, Jennifer J. Knack, Karina C. Krasomil-Osterfeld, Ryan Kukor, Anne Lanois, Phil Latreille, Nancy K. Leimgruber, Carolyn M. Lipke, Renyi Liu, Xiaojun Lu, Eric C. Martens, Pradeep R. Marri, Claudine Médigue, Megan L. Menard, Nancy M. Miller, Nydia Morales-Soto, Stacie Norton, Jean-Claude Ogier, Samantha S. Orchard, Dongjin Park, Youngjin Park, Barbara A. Qurollo, Darby Renneckar Sugar, Gregory R. Richards, Zoé Rouy, Brad Slominski, Kathryn Slominski, Holly Snyder, Brian C. Tjaden, Ransome van der Hoeven, Roy D. Welch, Cathy Wheeler, Bosong Xiang, Brad Barbazuk, Sophie Gaudriault, Brad Goodner, Steven C. Slater, Steven Forst, Barry S. Goldman, Heidi Goodrich-Blair
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0027909
Abstract: Members of the genus Xenorhabdus are entomopathogenic bacteria that associate with nematodes. The nematode-bacteria pair infects and kills insects, with both partners contributing to insect pathogenesis and the bacteria providing nutrition to the nematode from available insect-derived nutrients. The nematode provides the bacteria with protection from predators, access to nutrients, and a mechanism of dispersal. Members of the bacterial genus Photorhabdus also associate with nematodes to kill insects, and both genera of bacteria provide similar services to their different nematode hosts through unique physiological and metabolic mechanisms. We posited that these differences would be reflected in their respective genomes. To test this, we sequenced to completion the genomes of Xenorhabdus nematophila ATCC 19061 and Xenorhabdus bovienii SS-2004. As expected, both Xenorhabdus genomes encode many anti-insecticidal compounds, commensurate with their entomopathogenic lifestyle. Despite the similarities in lifestyle between Xenorhabdus and Photorhabdus bacteria, a comparative analysis of the Xenorhabdus, Photorhabdus luminescens, and P. asymbiotica genomes suggests genomic divergence. These findings indicate that evolutionary changes shaped by symbiotic interactions can follow different routes to achieve similar end points.
The Delta-Nucleon Interaction in Hadronic Reactions on a Deuteron Target
C. A. Mosbacher,F. Osterfeld
Physics , 1998,
Abstract: The pi+ d scattering and the d(p,n) charge exchange reaction are used to study the Delta-Nucleon interaction in the Delta resonance energy region. Various observables, such as inclusive and exclusive cross sections, angular distributions, and analyzing powers, are calculated in a coupled channel approach and shown to be influenced by the Delta-Nucleon potential.
Study of Delta-Delta excitations in the reaction n+p -> d+pi+pi
C. A. Mosbacher,F. Osterfeld
Physics , 1998,
Abstract: The deuteron spectrum in n+p -> d+pi+pi at k_n = 1.88 GeV/c and theta_d = 0 deg is explained by considering a Delta-Delta excitation as the reaction mechanism for the 2pi production. We study the influence of intermediate Delta-Delta and Delta-Nucleon interactions on the spectrum. The angular distribution of the pions is predicted.
The Delta(1232)-nucleon interaction in the 2H(p,n) charge exchange reaction
C. A. Mosbacher,F. Osterfeld
Physics , 1997, DOI: 10.1103/PhysRevC.56.2014
Abstract: The 2H(p,n) charge exchange reaction at T_p=790 MeV is used to study the Delta(1232)-nucleon interaction in the Delta resonance excitation energy region. For the Delta-N potential, a meson exchange model is adopted where pi, rho, omega, and sigma meson exchanges are taken into account. The deuteron disintegration below and above pion threshold is calculated using a coupled channel approach. Various observables, such as the inclusive cross section, the quasifree Delta decay, the coherent pion production, and the two-nucleon breakup are considered. It is shown that these observables are influenced by the dynamical treatment of the Delta degrees of freedom. Of special interest is the coherent pion decay of the Delta resonance which is studied by means of the exclusive reaction 2H(p,n pi+)2H. Both the peak energy and the magnitude of the coherent pion production cross section depend very sensitively on the strength of the Delta-N potential. The coherent pions have a peak energy of 300 MeV and a strongly forward peaked angular distribution.
Double Delta(1232) excitation and the ABC effect in the reaction n + p -> 2H (pi pi)
C. A. Mosbacher,F. Osterfeld
Physics , 1999,
Abstract: The deuteron spectrum in n+p -> 2 H(pi pi) at k_n = 1.88 GeV/c and theta_d = 0^o is explained by considering a Delta Delta excitation as the dominant reaction mechanism for the 2 pi production. We present a new theoretical approach based on a coupled channel formalism which allows to include the residual interaction within the intermediate Delta Delta and Delta N systems. The corresponding interaction potentials V_{DeltaDelta} and V_{DeltaN} are adopted from a meson exchange model with pi, rho, omega, and sigma exchange taken into account. The influence of the residual interaction on the deuteron spectrum is studied. We also predict the angular distribution of the two pions. It is shown that this distribution is closely connected to the spin structure of the DeltaDelta excitation.
Community Organization and People's Participation: The Philippine Experience
Karina C. David
Kasarinlan : Philippine Journal of Third World Studies , 1985,
Abstract: This article presents concepts of community organization in today's world by restating the original assumptions behind the terms and further allowing for new concepts and methods in the effort to advance and enrich the conceptual reserve for authentic people's organizing. An analysis is given on the three types of community organizers - the apologetic, the liberal, and the liberative, explaining the unique methods of operation of each. With this explanation, the present state of communities in the Philippines is provided, along with methodological guidelines for community organizing to help with the attainment of politicalization or the recovery of the people's right to define their own reality and determine an alternative future. In order for this to occur, the importance of well-informed and systematic organizers is crucial in the process of community organization.
Using Ferrous Ion for the Reductive Degradation of Hexavalent Chromium  [PDF]
Jude O. Ighere, Karina Honjoya, Ramesh C. Chawla
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.51002
Abstract: This paper discusses the toxicity and mobility of chromium species. And it presents the extent and kinetics of reductive remediation of hexavalent chromium, Cr+ using ferrous ion, Fe2+. Molar ratios of 1:3 and 1:6 of Cr (VI) to Fe (II) were used. Integral method of data analysis showed reaction followed second-order kinetics with R square values near unity. Reaction was initially fast but with a rapid precipitation attributed to Cr (III)-Fe (III) in previous studies. This colloidal precipitate ultimately stops the reaction, which explains while conversion efficiency increases with increased molar ratio of Cr (VI) to Fe (II). The impact of pH was investigated by adjusting the Cr (VI)-Fe (II) medium to pH 2.78, 5.24, 7.00, 9.00 and 11.96 using predetermined drops of acid or base. Reaction was more rapid under alkaline conditions with higher extent of degradation consistent with previous research. In soil system, mass transfer limitation was hardly noticed as high extent of reduction was recorded relative to aqueous phase. The high solubility of Cr (VI) aided the release into the aqueous media for reduction by ferrous sulfate.
Applications of Potassium Permanganate in the Oxidative Degradation of Trichloroethylene  [PDF]
Jude O. Ighere, Karina Honjoya, Ramesh C. Chawla
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.37003
Abstract: The scope of this study was to determine techniques to remediate trichloroethylene contamination under different environmental conditions, media and in co-existence with chromium. The specific objectives were focused on the oxidation of trichloroethylene (TCE) in soil and aqueous media using both unmodified KMnO4 particles and poly (methyl methacrylate), PMMA encapsulated KMnO4 in the presence and absence of hexavalent chromium, Cr(VI). Molar ratios (p-values) of KMnO4 to TCE were used as a determining factor in the TCE oxidation process. p-values of 2, 5 and 10 were investigated in aqueous media and an approximately 0.5 M-1·s-1 rate constant was obtained using unmodified KMnO4 in aqueous system. The extent of oxidation did not change with TCE concentration. In soil system, TCE oxidation requires a large amount of KMnO4 to produce similar results as in aqueous system. pH experiments indicate that except at high alkaline condition, pH does not impact the extent of TCE oxidation. Also, the presence of Cr(VI) did not hinder TCE oxidation by KMnO4. Using controlled release application, the rate of TCE oxidation was reduced by PMMA encapsulated KMnO4. Comparative study indicated an expectedly slow rate of TCE degradation using modified KMnO4 but similar overall extent of oxidation for both modified and unmodified
Increased susceptibility of 129SvEvBrd mice to IgE-Mast cell mediated anaphylaxis
Muthuvel Arumugam, Richard Ahrens, Heather Osterfeld, Leah C Kottyan, Xun Shang, John A Maclennan, Nives Zimmermann, Yi Zheng, Fred D Finkelman, Simon P Hogan
BMC Immunology , 2011, DOI: 10.1186/1471-2172-12-14
Abstract: 129S5 mice had significantly increased susceptibility to passive and oral OVA-induced active anaphylaxis. Increased susceptibility to anaphylaxis was associated with increased homeostatic mast cell levels but not OVA-specific IgE or IgG1 levels. In vitro analyses of BMMCs revealed no difference in FcεRI and c-Kit expression, however, 129S5 BMMCs possessed greater proliferative capacity and reduced caspase-3-mediated apoptosis. IgE-BMMC degranulation assays demonstrated no difference in degranulation efficiency. Furthermore, 129S5 mice possessed increased sensitivity to histamine-induced hypothermia.We conclude that 129S5 mice have increased susceptibility to anaphylaxis as compared to BALB/c strain and their increased susceptibility was associated with altered mast cell proliferation and homeostatic tissue levels and responsiveness to histamine. Given the wide spread usage of the 129SvEvBrd strain of mice in experimental gene targeting methodology, these data have important implications for studying IgE-reactions in mouse systems.Anaphylaxis is a rapid, life threatening allergic reaction often triggered by food, drugs, insect venoms, latex, or allergen immunotherapy [1-5]. Early clinical and experimental evidence suggests that systemic anaphylaxis is mediated by IgE/mast cell degranulation and the rapid release of preformed mediators, including histamine, proteoglycans, PAF, serotonin, tryptase, chymase and lipid-derived mediators (PGD2 and LTC4, LTD4 and LTE4) [6,7]. These mediators are reportedly acting on target cells to induce vasodilation, increased vascular permeability, hypotension, bronchospasm and, as a result, shock.With the recent emergence of several gene knockout mice (Fc?RI, histamine decarboxylase, IL-4Rα) there has been significant focus on employment of animal models of IgE-mediated passive and active systemic and oral antigen-induced anaphylaxis in an attempt to decipher the relative contributions of inflammatory cells and cytokines to disease path
STRUCTURE AND SEASONAL DYNAMICS OF PERIPHYTON COMMUNITIES FROM THE SOMESUL CALD UPPER CATCHMENT AREA
Karina Battes,Laura Momeu,C. Tudorancea
Annals of West University of Timi?oara : Series of Biology , 2003,
Abstract: The present paper represents a qualitative and quantitative study of periphyton communities from the Somesul Cald headwaters, during 2001. Eighty algal species belonging to five phyla were identified at the sampling sites. Due to diatom obvious domination (Bacillariophyta) in all seasons and at all stations, quantitative analysis referred to diatom percentage estimation, together with observations regarding their colonization on artificial substrata.
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