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Search Results: 1 - 10 of 340028 matches for " Kulandaisamy S. Joseph Wilson "
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Investigation of Photonic Band Gap in Si-Based One-Dimensional Photonic Crystal  [PDF]
Kulandaisamy S. Joseph Wilson, Vasan Revathy
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.38057
Abstract:

A one-dimensional silicon based photonic crystal with nonlinear defect layers is examined. The linear and nonlinear optical properties are analyzed. The transmission spectrum was obtained by applying the optical transfer matrix formalism to the photonic crystal. The various transmittance peaks obtained with the defect layers are investigated. The nature of the transmittance peak is analyzed with the number of defect layers.

CO Isotopes in Planetary Nebulae
Dana S. Balser,Joseph P. McMullin,T. L. Wilson
Physics , 2002, DOI: 10.1086/340309
Abstract: Standard stellar evolution theory is inconsistent with the observed isotopic carbon ratio, 12C/13C, in evolved stars. This theory is also inconsistent with the 3He/H abundance ratios observed in Galactic HII regions, when combined with chemical evolution theory. These discrepancies have been attributed to an extra, non-standard mixing which further processes material during the RGB and should lower both the 12C/13C and 3He/H abundance ratios for stars with masses < 2 solar masses. Measurements of isotopic ratios in planetary nebulae probe material which escapes the star to be further processed by future generations of stars. We have measured the carbon isotopic abundance ratio, 12C/13C, in 11 planetary nebulae (PNe) by observing the J=2-->1 and J=3-->2 millimeter transitions of 12CO and 13CO in molecular clouds associated with the PNe. A large velocity gradient (LVG) model has been used to determine the physical conditions for each PNe where both transitions have been detected. We detect both 12CO and 13CO in 9 PNe. If 12CO/13CO = 12C/13C, the range of 12C/13C is 2.2--31. Our results support theories which include some form of extra mixing.
Phylogeographic Investigations of the Widespread, Arid-Adapted Antlion Brachynemurus sackeni Hagen (Neuroptera: Myrmeleontidae)
Joseph S. Wilson,Kevin A. Williams,Clayton F. Gunnell,James P. Pitts
Psyche , 2010, DOI: 10.1155/2010/804709
Abstract: Several recent studies investigating patterns of diversification in widespread desert-adapted vertebrates have associated major periods of genetic differentiation to late Neogene mountain-building events; yet few projects have addressed these patterns in widespread invertebrates. We examine phylogeographic patterns in the widespread antlion species Brachynemurus sackeni Hagen (Neuroptera: Myrmeleontidae) using a region of the mitochondrial gene cytochrome oxidase I (COI). We then use a molecular clock to estimate divergence dates for the major lineages. Our analyses resulted in a phylogeny that shows two distinct lineages, both of which are likely distinct species. This reveals the first cryptic species-complex in Myrmeleontidae. The genetic split between lineages dates to about 3.8–4.7 million years ago and may be associated with Neogene mountain building. The phylogeographic pattern does not match patterns found in other taxa. Future analyses within this species-complex may uncover a unique evolutionary history in this group. 1. Introduction Phylogeographic analyses investigate the relationship between genealogies and their geographic distribution [1]. Many recent studies have investigated the historical biogeography of the Nearctic arid lands through the phylogeographic analyses of wide-ranging, desert-adapted taxa [2–7]. These studies often associated major genetic divergences with mountain-building events that took place in the late Neogene. As a result of these late Neogene events, deeply divergent clades were found to be restricted to the eastern (Chihuahuan) and western (Mojave and Sonoran) deserts. While the various hypotheses detailing the causes of the diversification of the Nearctic’s arid-adapted biota approach a generalized model [8], little work has been done on wide-ranging, arid-adapted arthropods [7]. Phylogeographic analyses of these organisms will aid in the development of a generalized model detailing diversification in the deserts. In addition to the importance of phylogeographic analyses to historical biogeography, these analyses often uncover the existence of cryptic species [9–13]. Recognition of these complexes is an essential aspect of documenting biodiversity and can be beneficial in the development of conservation strategies [14, 15]. While some phylogeographic investigations have been done on arid-adapted arthropods, like beetles [16, 17], velvet ants [7, 18], and spiders [2, 19], several diverse arthropod groups remain unexplored. One such group are the antlions (Neuroptera: Myrmeleontidae). Antlions in the tribe
Ecological and Evolutionary Processes Drive the Origin and Maintenance of Imperfect Mimicry
Joseph S. Wilson, Joshua P. Jahner, Kevin A. Williams, Matthew L. Forister
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0061610
Abstract: Although the forces behind the evolution of imperfect mimicry remain poorly studied, recent hypotheses suggest that relaxed selection on small-bodied individuals leads to imperfect mimicry. While evolutionary history undoubtedly affects the development of imperfect mimicry, ecological community context has largely been ignored and may be an important driver of imperfect mimicry. Here we investigate how evolutionary and ecological contexts might influence mimetic fidelity in Müllerian and Batesian mimicry systems. In Batesian hoverfly systems we find that body size is not a strong predictor of mimetic fidelity. However, in Müllerian velvet ants we find a weak positive relationship between body size and mimetic fidelity when evolutionary context is controlled for and a much stronger relationship between community diversity and mimetic fidelity. These results suggest that reduced selection on small-bodied individuals may not be a major driver of the evolution of imperfect mimicry and that other factors, such as ecological community context, should be considered when studying the evolution of imperfect mimicry.
Radio-Variability in Radio-Quiet Quasars and Low-Luminosity AGN
Heino Falcke,Joseph Lehar,Richard Barvainis,Neil M. Nagar,Andrew S. Wilson
Physics , 2000,
Abstract: We report on two surveys of radio-weak AGN to look for radio variability. We find significant variability with an RMS of 10-20% on a timescale of months in radio-quiet and radio-intermediate quasars. This exceeds the variability of radio cores in radio-loud quasars (excluding blazars), which vary only on a few percent level. The variability in radio-quiet quasars confirms that the radio emission in these sources is indeed related to the AGN. The most extremely variable source is the radio-intermediate quasar III Zw 2 which was recently found to contain a relativistic jet. In addition we find large amplitude variabilities (up to 300% peak-to-peak) in a sample of nearby low-luminosity AGN, Liners and dwarf-Seyferts, on a timescale of 1.5 years. The variability could be related to the activity of nuclear jets responding to changing accretion rates. Simultaneous radio/optical/X-ray monitoring also for radio-weak AGN, and not just for blazars, is therefore a potentially powerful tool to study the link between jets and accretion flows.
Synthesis of Poly(APP-co-EGDMA) Particles Using Monomers Derived from Cashew Nut Shell Liquid for the Removal of Cr(III) from Aqueous Solutions  [PDF]
Joseph Wilson, Joseph Yoeza Naimani Philip, James Epiphan Gabriel Mdoe
Open Journal of Organic Polymer Materials (OJOPM) , 2014, DOI: 10.4236/ojopm.2014.41005
Abstract:

This work was aimed at synthesizing Cashew Nut Shell Liquid (CNSL) based polymer particles for adsorption of Cr(III) ions from aqueous solutions. Natural CNSL was used as a starting material in synthesizing amino pentadecylphenols (APP). This was achieved through isolating anacardic acid from the CNSL via calcium anacardate procedure, followed by hydrogenation of the alkenyl side chains, and subsequently decarboxylating the product to form 3-pentadecylphenol, which was then nitrated and reduced to a mixture of APP. APP were co-polymerized with ethylene glycol dimethacrylate (EGDMA) to form poly(APP-co-EGDMA) particles. The chemical structures of the synthesized compounds were confirmed by Fourier Transform IR and 1H-NMR. The co-polymer particles were characterized by Scanning Electron Microscopy (SEM) to establish their morphological properties. The prepared co-polymer particles were found to have-NH loading of 46 mmol/g and a maximum adsorption capacity for Cr(III) ions of 16 mg per g of dry polymer particles. The spent polymer particles were recoverable and reusable.

Splenic Red Pulp Macrophages Produce Type I Interferons as Early Sentinels of Malaria Infection but Are Dispensable for Control
Charles C. Kim, Christopher S. Nelson, Emily B. Wilson, Baidong Hou, Anthony L. DeFranco, Joseph L. DeRisi
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0048126
Abstract: Type I interferons (T1IFNs) are among the earliest cytokines produced during infections due to their direct regulation by innate immune signaling pathways. Reports have suggested that T1IFNs are produced during malaria infection, but little is known about the in vivo cellular origins of T1IFNs or their role in protection. We have found that in addition to plasmacytoid dendritic cells, splenic red pulp macrophages (RPMs) can generate significant quantities of T1IFNs in response to P. chabaudi infection in a TLR9-, MYD88-, and IRF7-dependent manner. Furthermore, T1IFNs regulate expression of interferon-stimulated genes redundantly with Interferon-gamma (IFNG), resulting in redundancy for resistance to experimental malaria infection. Despite their role in sensing and promoting immune responses to infection, we observe that RPMs are dispensable for control of parasitemia. Our results reveal that RPMs are early sentinels of malaria infection, but that effector mechanisms previously attributed to RPMs are not essential for control.
The Hepatocyte Growth Factor/c-Met Antagonist, Divalinal-Angiotensin IV, Blocks the Acquisition of Methamphetamine Dependent Conditioned Place Preference in Rats
John W. Wright,Wendy L. Wilson,Vanessa Wakeling,Alan S. Boydstun,Audrey Jensen,Leen Kawas,Joseph W. Harding
Brain Sciences , 2012, DOI: 10.3390/brainsci2030298
Abstract: The use of methamphetamine (MA) is increasing in the U.S. and elsewhere around the world. MA’s capacity to cause addiction significantly exceeds other psychostimulant drugs, and its use negatively impacts learning and memory. Recently, attempts have been made to interfere with the presumed mechanism(s) underlying the establishment of drug-induced memory consolidation. The majority of these studies have employed matrix metalloproteinase (MMP) inhibitors to disrupt MMP-induced extracellular matrix molecule dependent synaptic reconfiguration, or GABA receptor agonists. The present investigation utilized an angiotensin IV (AngIV) analogue, Divalinal-AngIV (divalinal), to disrupt acquisition of MA-induced dependence in rats as measured using the conditioned place preference paradigm. Results indicate that both acute and chronic intracerebroventricular infusion of divalinal prior to each daily subcutaneous injection of MA prevented acquisition. However, divalinal was unable to prevent MA-induced reinstatement after prior acquisition followed by extinction trials. These results indicate that prevention of MA dependence can be accomplished by blockade of the brain AT 4 receptor subtype. On the other hand, once MA-induced memory consolidation is in place divalinal appears to be ineffective. Mechanistic studies indicated that divalinal is a potent inhibitor of the hepatocyte growth factor (HGF)/c-Met receptor system, and thus it appears that a functional HGF/c-Met system is required for the acquisition of MA-mediated conditioned place preference.
Conocen los usuarios sus deberes y derechos?: Una evaluación posterior a una intervención Do the users know their rights and responsibilities?: A post-intervention evaluation
Fabio Alberto Camargo Figuera,Dora Inés Parra,Rocío Rey Gómez,Wilson Joseph Gómez Quintero
Revista de la Universidad Industrial de Santander. Salud , 2011,
Abstract: Introducción: Los derechos y deberes de los enfermos son un factor fundamental en un sistema de salud y un indicador de la calidad del servicio, por tal motivo, las instituciones prestadoras de servicios de salud tienen la responsabilidad de promover su conocimiento, no sólo en el personal asistencial y administrativo, sino también en sus usuarios, a fin de que ellos puedan exigir el cumplimiento de los mismos. Objetivos: Determinar el nivel de conocimiento de los usuarios sobre sus derechos y deberes en una institución de salud de Tercer Nivel de atención. Materiales y métodos: Se realizó un estudio descriptivo de corte trasversal luego de la implementación de un proyecto educativo que buscaba socializar entre los usuarios sus derechos y deberes. Se calculó un tama o muestral de 369 usuarios, con un nivel de confianza del 95,0%, poder estadístico del 80,0%, prevalencia esperada de buenos conocimientos del 50,0%, y un IC 95% (45,0-55,0%). Se realizó muestreo aleatorio simple. Se solicito consentimiento informado a todos los participantes. Resultados: El 54,7% de los usuarios tenía un nivel de conocimiento bueno, el 40,5% regular y el 4,8% deficiente. El nivel de conocimientos fue mayor, con respecto a una encuesta anterior. El 10,9% de los usuarios manifestaron que habían recibido información sobre sus derechos y deberes, y de estos el 40,4% la recibieron en la ESE-HUS. Conclusiones: En su mayoría, los usuarios tenían un buen nivel de conocimientos sobre derechos y deberes de los enfermos, a pesar de no haber recibido información sobre el tema. Salud UIS 2011; 43(1): 11-19 Introduction: Patients rights and responsibilities are a fundamental factor in on health system and a service quality indicator of the service, for that reason, health-care institutions have the responsibility to promote ther awareness not only among health-care and management staff, but also in their users, so that these could demond their compliance. Objectives: To determine the users level of knowledge or awareness in terms of their rights and responsibilities in a Third-Level health-care institution. Materials and methods: A transversal cut descriptive study was conducted after implementation of an educational project aimed to socialize users rights and obligations among patient population. A sample group of 369 users was calculated, with 95.0%, trust level, 80.0% statistical power, 50.0% expected awareness prevalence, and 95.0% (45.0-55.0%) IC. Simple random sampling was conducted. Consent in writing was obtained from all participants. Results: Fifty four point seven (54.7%) of u
Dye decolorizing potential of a novel fungus Coriolus versicolor ML04 in the medium optimized by response surface methodology
Venil, Chidambaram Kulandaisamy;Lakshmanaperumalsamy, Perumalsamy;
Brazilian Archives of Biology and Technology , 2010, DOI: 10.1590/S1516-89132010000600028
Abstract: the potential of the white rot fungus, coriolus versicolor ml04 to decolorize the widely used textile dye blue bb was tested by employing statistical optimization. response surface methodology (rsm) involving a central composite design (ccd) was applied to evaluate the interactive effects of four significant factors in different ranges i.e.; glucose (0.5 - 2.5 g/l), yeast extract (0.4 -1.2 g/l), dye concentration (100 - 500 ppm) and inoculum size (5 - 20 % v/v) to decolorize the blue bb. the results demonstrated the effectiveness of the statistical experimental design and the ability of c. versicolor ml04 for maximum dye decolorization (>96%) at the optimum conditions of the significant factors.
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