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Search Results: 1 - 10 of 333396 matches for " C. Luna and K. Grunber "
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Relationship between seed yield and its component characters in Cenchrus spp.
S. Griffa*, M. Quiroga, A. Ribotta, E. López Colomba, E. Carloni, E. Tommasino, C. Luna and K. Grunber
Electronic Journal of Plant Breeding , 2012,
Abstract: Cenchrus setigerus, C. sp., eleven obligate apomictic cultivars and a sexual line of Cenchrus ciliaris L. were studied to determinethe relationship between seed production and its component characters, through principal component analysis, path correlationanalysis and analysis of variance. A completely randomized field design was used. Ten vegetative and reproductivemorphological characters were measured. Seed production was influenced directly by panicle weight and indirectly by paniclelength, 1000 seed weight, length and width of flag leaf lamina and length of flag leaf sheath. Panicle weight showed highheritability and variability among genotypes. Hence, panicle weight can be considered a selection criterion to obtain increasedseed production in Cenchrus. The cultivar Lucero INTA PEMAN exhibited the highest panicle weight and, therefore, greatestseed production, which makes it suitable for selection as parental cultivar to obtain new germplasm in Cenchrus with high seedyield.
Updated Spin Ephemeris for the Cataclysmic Variable EX Hydrae
C. W. Mauche,N. S. Brickhouse,R. Hoogerwerf,G. J. M. Luna,K. Mukai,C. Sterken
Physics , 2009,
Abstract: Historical optical data are combined with more recent optical, extreme ultraviolet, and X-ray data to update the spin ephemeris of the cataclysmic variable EX Hya.
Fatal necrotizing pneumonia due to a Panton-Valentine leukocidin positive community-associated methicillin-sensitive Staphylococcus aureus and Influenza co-infection: a case report
Jill C Roberts, Sam P Gulino, K Kealy Peak, Vicki A Luna, Roger Sanderson
Annals of Clinical Microbiology and Antimicrobials , 2008, DOI: 10.1186/1476-0711-7-5
Abstract: We describe a fatal case of necrotizing pneumonia in a patient co-infected with Influenza B and a community-associated, PVL-positive methicillin-susceptible Staphylococcus aureus (MSSA).Necrotizing pneumonia due to community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) is increasingly reported in otherwise healthy individuals [1]. Several cases of community-associated pneumonia (CAP) have been attributed to methicillin-resistant strains such as the USA 300 epidemic CA-MRSA clone and are often associated with influenza virus infection or influenza-like illness (ILI) [2]. The USA 300 clone harbors the gene encoding Panton-Valentine leukocidin (PVL) [3], a pore-forming toxin that targets cells of the immune system [4]. Although the majority of CA-MRSA infections involving skin and soft tissue likely occur independent of PVL toxin production [5], PVL is required for lung tissue necrosis and inflammation as present in the rare, but frequently fatal, cases of necrotizing pneumonia[4,6]. We report here a fatal case of necrotizing pneumonia in a patient co-infected with Influenza B and a PVL-positive Staphylococcus aureus that in contrast to recent reported cases is methicillin-susceptible.A previously healthy 30 year old black woman went to her local emergency department on April 12, 2007 with a 4 to 5 day history of sore throat, chills, fever and shortness of breath. A chest radiograph was performed and read as clear, however detail was obscured by abundant overlying soft tissue. She was diagnosed with bronchitis and treated with intravenous antibiotics and steroids. She was discharged to home with a prescription for albuterol and azithromycin, however the antibiotic was not utilized. Early the following morning, she developed worsening symptoms including hemoptysis. She was brought to the emergency room by ambulance. Vital signs at time of admission included a fever of 100.5°F (38°C), pulse of 165 bpm, and blood pressure of 104/53 mm Hg. In the emerge
High-resolution X-ray Spectra Of The Symbiotic Star SS73 17
R. N. C. Eze,G. J. M. Luna,R. K. Smith
Physics , 2009, DOI: 10.1088/0004-637X/709/2/816
Abstract: SS73 17 was an innocuous Mira-type symbiotic star until Integral and Swift discovered its bright hard X-ray emission, adding it to the small class of "hard X-ray emitting symbiotics." Suzaku observations in 2006 then showed it emits three bright iron lines as well, with little to no emission in the 0.3-2 keV bandpass. We present here followup observations with the Chandra HETG and Suzaku that confirm the earlier detection of strong emission lines of Fe Kalpha fluorescence, Fe XXV and Fe XXVI but also show significantly more soft X-ray emission. The high resolution spectrum also shows emission lines of other highly ionized ions as Si XIV and possibly S XVI. In addition, a reanalysis of the 2006 Suzaku data using the latest calibration shows that the hard (15-50 keV) X-ray emission is brighter than previously thought and remains constant in both the 2006 and 2008 data. The G ratio calculated from the Fe XXV lines shows that these lines are thermal, not photoionized, in origin. With the exception of the hard X-ray emission, the spectra from both epochs can be fit using thermal radiation assuming a differential emission measure based on a cooling flow model combined with a full and partial absorber. We show that acceptable fits can be obtained for all the data in the 1-10 keV band varying only the partial absorber. Based on the temperature and accretion rate, the thermal emission appears to be arising from the boundary layer between the accreting white dwarf and the accretion disk.
Bacillus Strains Most Closely Related to Bacillus nealsonii Are Not Effectively Circumscribed within the Taxonomic Species Definition
K. Kealy Peak,Kathleen E. Duncan,Vicki A. Luna,Debra S. King,Peter J. McCarthy,Andrew C. Cannons
International Journal of Microbiology , 2011, DOI: 10.1155/2011/673136
Abstract: Bacillus strains with >99.7% 16S rRNA gene sequence similarity were characterized with DNA:DNA hybridization, cellular fatty acid (CFA) analysis, and testing of 100 phenotypic traits. When paired with the most closely related type strain, percent DNA:DNA similarities (% ) for six Bacillus strains were all far below the recommended 70% threshold value for species circumscription with Bacillus nealsonii. An apparent genomic group of four Bacillus strain pairings with 94%–70% was contradicted by the failure of the strains to cluster in CFA- and phenotype-based dendrograms as well as by their differentiation with 9–13 species level discriminators such as nitrate reduction, temperature range, and acid production from carbohydrates. The novel Bacillus strains were monophyletic and very closely related based on 16S rRNA gene sequence. Coherent genomic groups were not however supported by similarly organized phenotypic clusters. Therefore, the strains were not effectively circumscribed within the taxonomic species definition.
Prevalência de cárie e fatores associados em crian?as hemofílicas
Rodrigues, Maria José;Luna, Ana Cláudia A.;Leal, Liliane C.;Lira, Suzana S.;Marques, Kátia M.;
Revista Brasileira de Hematologia e Hemoterapia , 2008, DOI: 10.1590/S1516-84842008000200008
Abstract: the present study aimed at verifying tooth decay and some associated factors in hemophilic children of both genders with ages from 3 to 12 years old, treated in the center of hemoterapia of pernambuco (hemope) in 2005 and 2006. the data were collected from an intentional sample composed of 40 children. data collection was achieved in two phases: clinical and non-clinical. in the clinical phase, an intrabuccal clinical examination was performed by a specialist. while in the non-clinical phase, the guardians of the children were requested to complete a questionnaire with objective and subjective questions on behavioral and social factors. to determine tooth decay, the ceo-d and cpo-d indexes were adopted as recommended by the world health organization. analysis of the data showed the ceo-d index was 2.00 and the cpo-d index was 0.67. additionally, in respect to the education of the guardians, the ceo-d index was 1.51 and 2.50 for children of parents with incomplete and complete primary school education, respectively. similarly, the cpo-d was 0.78 and 0.59 for participants whose parents had incomplete and complete primary school education, respectively. it was possible to conclude that tooth decay in this group was low and there was a significant association between tooth decay and socioeconomic development indicators. in respect to the education of guardians, less tooth decay was observed in children whose mothers received guidance on oral hygiene and diet.
Bacillus Strains Most Closely Related to Bacillus nealsonii Are Not Effectively Circumscribed within the Taxonomic Species Definition
K. Kealy Peak,Kathleen E. Duncan,Vicki A. Luna,Debra S. King,Peter J. McCarthy,Andrew C. Cannons
International Journal of Microbiology , 2011, DOI: 10.1155/2011/673136
Abstract: Bacillus strains with >99.7% 16S rRNA gene sequence similarity were characterized with DNA:DNA hybridization, cellular fatty acid (CFA) analysis, and testing of 100 phenotypic traits. When paired with the most closely related type strain, percent DNA:DNA similarities (% ) for six Bacillus strains were all far below the recommended 70% threshold value for species circumscription with Bacillus nealsonii. An apparent genomic group of four Bacillus strain pairings with 94%–70% was contradicted by the failure of the strains to cluster in CFA- and phenotype-based dendrograms as well as by their differentiation with 9–13 species level discriminators such as nitrate reduction, temperature range, and acid production from carbohydrates. The novel Bacillus strains were monophyletic and very closely related based on 16S rRNA gene sequence. Coherent genomic groups were not however supported by similarly organized phenotypic clusters. Therefore, the strains were not effectively circumscribed within the taxonomic species definition. 1. Introduction CBD 118 was one of the two first Bacillus strains not related to the B. cereus group reported to harbor the capsule genes carried on pXO2 by Bacillus anthracis (USF Center for Biological Defense (CBD)) [1, 2]. Luna et al. isolated and sequenced the capsule operon (capA, capB, capC, capD, and promoter), repA, capR, acpA, IS1627, ORF43, ORF48, and ORF61 on a large plasmid in CBD 118 [1]. Its status as a carrier of B. anthracis capsule genes spurred research into determining its closest relatives, to aid in circumscribing the reservoir of genes essential for virulence in B. anthracis. When near full length 16S rRNA gene sequences were compared, the most similar type strains to strain CBD 118 were Bacillus circulans ATCC (98.9%) and Bacillus nealsonii DSM (99.3%). Strain CBD 118 differed from B. circulans ATCC and B. nealsonii DSM for 10 and 12 of 100 phenotypic traits evaluated, respectively. The percentages of DNA:DNA binding in two pairings each of strain CBD 118 to B. circulans ATCC and B. nealsonii DSM were 12.5 and 10.2% and 10.8 and 8.3%, respectively. Thus, strain CBD 118 is differentiated by phenotypic and genome-based methods from the only validly named species with greater than 98.7% 16S rRNA gene sequence similarity [3–5]. Strain CBD 118 was the sole exemplar of a novel species. Prior to the proposal of novel species, studies of ten or more strains are recommended in order to detail intraspecies diversity and to foster appropriate type strain assignment [6–8]. To identify the requisite closely related strains, the
Swift Observations of Hard X-ray Emitting White Dwarfs in Symbiotic Stars
J. A. Kennea,K. Mukai,J. L. Sokoloski,G. J. M. Luna,J. Tueller,C. B. Markwardt,D. N. Burrows
Physics , 2009, DOI: 10.1088/0004-637X/701/2/1992
Abstract: The X-ray emission from most accreting white dwarfs (WDs) in symbiotic binary stars is quite soft. Several symbiotic WDs, however, produce strong X-ray emission at energies greater than ~20 keV. The Swift BAT instrument has detected hard X-ray emission from 4 such accreting WDs in symbiotic stars: RT Cru, T CrB, CD -57 3057, and CH Cyg. In one case (RT Cru), Swift detected X-rays out to greater than 50 keV at a > 5 sigma confidence level. Combining data from the XRT and BAT detectors, we find that the 0.3-150 keV spectra of RT Cru, T CrB, and CD -57 3057 are well described by emission from a single-temperature, optically thin thermal plasma, plus an unresolved 6.4-6.9 keV Fe line complex. The X-ray spectrum of CH Cyg contains an additional bright soft component. For all 4 systems, the spectra suffer high levels of absorption from material that both fully and partially covers the source of hard X-rays. The XRT data did not show any of the rapid, periodic variations that one would expect if the X-ray emission were due to accretion onto a rotating, highly magnetized WD. The X-rays were thus more likely from the accretion-disk boundary layer around a massive, non-magnetic WD in each binary. The X-ray emission from RT Cru varied on timescales of a few days. This variability is consistent with being due to changes in the absorber that partially covers the source, suggesting localized absorption from a clumpy medium moving into the line of sight. The X-ray emission from CD -57 3057 and T CrB also varied during the 9 months of Swift observations, in a manner that was also consistent with variable absorption.
HST FUV monitoring of TW Hya
H. M. Günther,N. S. Brickhouse,A. K. Dupree,S. J. Wolk,P. C. Schneider,G. J. M. Luna
Physics , 2014,
Abstract: Classical T Tauri stars (CTTS) are young (< 10 Myr), cool stars that actively accrete matter from a disk. They show strong, broad and asymmetric, atomic FUV emission lines. Neither the width, nor the line profile is understood. Likely, different mechanisms influence the line profile; the best candidates are accretion, winds and stellar activity. We monitored the C IV 1548/1550 Ang doublet in the nearby, bright CTTS TW Hya with the Hubble Space Telescope Cosmic Origin Spectrograph (HST/COS) to correlate it with i) the cool wind, as seen in COS NUV Mg II line profiles, ii) the photometric period from joint ground-based monitoring, iii) the accretion rate as determined from the UV continuum, and iv) the Ha line profile from independent ground-based observations. The observations span 10 orbits distributed over a few weeks to cover the typical time scales of stellar rotation, accretion and winds. Here we describe a model with intrinsically asymmetric C IV lines.
Chandra observation of an ultraluminous X-ray source from the Galaxy NGC 12911
Juan C Luna
Physics , 2009,
Abstract: I report the analysis of an ultraluminous X-ray source (ULX) located in the galaxy NGC 1291. This X-ray point source is denominated IXO6 in the Catalog of Candidate IXO (Colbert & Ptak). An Intermediate-luminosity X-ray Object (IXO) is defined as an off-nuclear, compact object with luminosity Lx [2-10keV] >= 1039 erg s-1. The cutoff Lx is defined as a value greater than the Eddington luminosity of a 1.4 Mo black hole (10 38.3 erg s-1). IXO is an early denomination of what is call now a ULX point source. The Catalog was derived from a ROSAT survey and represents 87 IXOS in 54 galaxies. IXO6 was selected because of being positioned in the outer disk of the galaxy, with no near X-ray source neighbors. The study of this ULX pretends to confirm certain assumptions related to this class of objects (Roberts et al.)
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