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Search Results: 1 - 10 of 137888 matches for " LADO LI?ARES MARCOS "
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Variabilidade espacial da rugosidade superficial do solo medida com rugosímetros de agulhas e laser
BERTOLANI FERNANDO CESAR,PAZ GONZáLEZ ANTONIO,LADO LIARES MARCOS,VIDAL VáZQUEZ EVA
Bragantia , 2000,
Abstract: A variabilidade espacial da rugosidade superficial do solo foi estudada a partir de uma grade de dados pontuais medidos com instrumentos de diferentes graus de precis o. Para a medi o da rugosidade utilizou-se um rugosímetro laser, em condi es de laboratório, sendo as leituras realizadas antes e após a aplica o de diferentes quantidades de chuva (0 mm, 10 mm, 55 mm, 85 mm). Nas condi es de campo (pastagem e superfície arada) utilizou-se um rugosimetro de agulhas, e as leituras foram realizadas em quatro datas distintas. Verificou-se alta dependência espacial para a rugosidade superficial, com os dados obtidos em ambos os métodos e em todos os tratamentos. Os parametros dos semivariogramas obtidos com os dados do rugosímetro de agulhas apresentaram grandes varia es nas diferentes datas, devido à forma de distribui o e ao tamanho dos agregados. Isso indica a dificuldade de encontrar um modelo tridimensional, representativo do microrrelevo, em condi es de campo. Verificou-se grande semelhan a em todos os semivariogramas obtidos a partir dos dados do rugosímetro laser (superfície simulada) indicando que, apesar das altera es na rugosidade superficial, n o foram observadas modifica es no comportamento da dependência espacial com a aplica o de diferentes quantidades de chuva.
Variabilidade espacial da rugosidade superficial do solo medida com rugosímetros de agulhas e laser
BERTOLANI, FERNANDO CESAR;PAZ GONZáLEZ, ANTONIO;LADO LIARES, MARCOS;VIDAL VáZQUEZ, EVA;VIVAS MIRANDA, JOSé GARCíA;
Bragantia , 2000, DOI: 10.1590/S0006-87052000000200015
Abstract: the spatial variability of the soil surface roughness was analysed by instruments of different precision degrees in a grid of data points. for measuring the roughness it was used a laser reliefmeter before and after application of different amounts of rain (0 mm, 10 mm, 55 mm, 85 mm) in the laboratory. at field conditions (pasture and ploughed surface) a pin reliefmeter was used at four different dates. the results showed a great spatial dependence of soil surface roughness in both methods and for all treatments. the great variation of semivariogram parameters obtained with pin reliefmeter data for all different dates was due to the distribution and size of soil aggregates. this indicates how difficult it is to obtain a representative tridimensional microrelief model at field conditions. all other semivariograms obtained with laser reliefmeter data (simulated surface) were similar among themselves, indicating that despite the alterations in the soil surface roughness, the spatial dependence pattern did not change with different amounts of rain.
Bases farmacomicrobiológicas del tratamiento antibiótico de las enfermedades periodontales y periimplatarias
Liares,J.; Martín-Herrero,J.E.;
Avances en Periodoncia e Implantología Oral , 2003, DOI: 10.4321/S1699-65852003000300004
Abstract: periodontal disease must be considered a chronic bacterial infection. it does not appear to one single bacterial species that is uniquely involved. rather, periodontal disease seems to be a polymicrobial infection involving several organisms. the bacteria most often associated with periodontal disease are actinobacillus actinomycetemcomitans, porphyromonas gingivalis, prevotella intermedia, bacteroides forsythus y treponema denticola. pharmacodynamics parameters are very useful to select dosing regimens. the increase in prevalence of resistance occurred in some periodontopathogens in the last years has pushed some antibiotics into the background. positive responses have been reported with amoxicillin/clavulanate, metronidazole, clindamycin, doxycycline and the combination therapy metronidazole plus amoxicillin and metronidazole plus amoxicillin/clavulanate.
Bases farmacomicrobiológicas del tratamiento antibiótico de las enfermedades periodontales y periimplatarias Farmacobiological concepts in the antibiotic treatment of the periodontal diseases
J. Liares,J.E. Martín-Herrero
Avances en Periodoncia e Implantología Oral , 2003,
Abstract: La enfermedad periodontal debe considerarse un proceso infeccioso bacteriano crónico. En su etiología, no hay una única especie bacteriana implicada, sino que podríamos considerarla como una infección polimicrobiana en la que estarían implicados diversos microorganismos. Las bacterias que se han asociado más directamente con la enfermedad periodontal son Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, Prevotella intermedia, Bacteroides forsythus y Treponema denticola. Los parámetros farmacodinámicos de los antibióticos son muy útiles a la hora de seleccionar pautas posológicas. El aumento de resistencias producido en muchos periodontopatógenos en los últimos a os ha relegado a algunos antibióticos a un segundo plano. Entre la gran variedad de antibióticos utilizados, se han obtenido buenas respuestas terapéuticas con amoxicilina/ácido clavulánico, metronidazol, clindamicina, doxiciclina y las combinaciones de metronidazol más amoxicilina y metronidazol más amoxicili-na/ácido clavulánico. Periodontal disease must be considered a chronic bacterial infection. It does not appear to one single bacterial species that is uniquely involved. Rather, periodontal disease seems to be a polymicrobial infection involving several organisms. The bacteria most often associated with periodontal disease are Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, Prevotella intermedia, Bacteroides forsythus y Treponema denticola. Pharmacodynamics parameters are very useful to select dosing regimens. The increase in prevalence of resistance occurred in some periodontopathogens in the last years has pushed some antibiotics into the background. Positive responses have been reported with amoxicillin/clavulanate, metronidazole, clindamycin, doxycycline and the combination therapy metronidazole plus amoxicillin and metronidazole plus amoxicillin/clavulanate.
Pencil Beam Patterns Obtained by Planar Arrays of Parasitic Dipoles FED by Only One Active Element
Marcos Alvarez Folgueiras;J. A. Rodriguez Gonzalez;Francisco Jose Ares-Pena
PIER , 2010, DOI: 10.2528/PIER10040705
Abstract: In this paper, an innovative method for obtaining a pencil beam pattern is presented. Planar arrays of parasitic dipoles are used to modify the pattern of an active dipole above a ground plane, in order to obtain a pencil beam of moderate gain and bandwidth. Only one feed point and one active element provides a very simple feeding network that reduces the complexity of the antenna. The correct configuration of the elements of the parasitic arrays allows to obtain the desired pencil beam pattern. Three designs that use parasitic arrays fed by a λ/2-dipole and synthesize pencil beam patterns are shown: 1) an antenna designed at 1.645 GHz and composed by one layer of 49 parasitic elements; 2) an antenna designed at the same frequency but composed by two layers of 49 parasitic elements; 3) an antenna designed at 5 GHz, composed by one layer of 49 parasitic elements, and taking into account the dielectric substrate and teflon screws.
Experimental Results on a Planar Array of Parasitic Dipoles FED by One Active Element
Marcos Alvarez Folgueiras;Juan Antonio Rodríguez-Gonzalez;Francisco Jose Ares-Pena
PIER , 2011, DOI: 10.2528/PIER11010303
Abstract: A planar array composed of 41 parasitic dipoles, above a ground plane, fed by an active dipole at 5 GHz, was designed to obtain a pencil beam pattern with a moderate gain and bandwidth. Experimental results are in good agreement with the theory and show a pattern with an 18.78 dB gain, a sidelobe level (SLL) of -15 dB, an impedance bandwidth of 16.53% (the frequency range over which the value of S11 is below -10 dB) and a 2.7% bandwidth that is achieved within 1 dB gain variations.
Constraining scalar field dark energy with cosmological observations
Lado Samushia
Physics , 2009,
Abstract: High precision cosmological observations in last decade suggest that about 70% of our universe's energy density is in so called "Dark Energy" (DE). Observations show that DE has negative effective pressure and therefore unlike conventional energy sources accelerates the cosmic expansion instead of decelerating it. DE is highly uniform and has become a dominant component only recently. The simplest candidate for DE is the time-independent cosmological constant $\Lambda$. Although successful in fitting available data, the cosmological constant model has a number of theoretical shortcomings and because of that alternative models of DE are considered. In one such scenario a cosmological scalar field that slowly rolls down its potential acts like a time-dependent cosmological constant. I have used different independent cosmological data sets to constrain the time dependence of DE's energy density in the framework of the slowly-rolling cosmological scalar field model. Present data favors a time-independent cosmological constant, but the time-dependent DE can not be ruled out at high confidence level. Ongoing and planned cosmological probes and surveys will provide more and better quality data over the next decade. When the new data sets are available we will be able to either detect the time dependence of DE or constrain it to a very small physically uninteresting value.
Spatial Memory Deficits and Their Correlations with Clusters of Shrunken Neuronal Soma in the Cortices and Limbic System Following a “Mild’’ Mechanical Impact to the Dorsal Skull in Female Rats  [PDF]
Wudu E. Lado, Michael A. Persinger
Journal of Behavioral and Brain Science (JBBS) , 2012, DOI: 10.4236/jbbs.2012.23038
Abstract: Background: Previous results showed that quantitative changes in behavioural accuracies by rats that sustained a “mild” closed head injury were moderately correlated with the total areas (numbers) of anomalous neuronal soma within regions below the impact. Method: Water maze behavioural measures within one day or two months after a single impact of mechanical force over the right dorsal skull, with or without stunning and with or without subsequent pregnancy, were measured and compared to proportions of anomalous neurons under the impact site. Results: The consequences of the impact accommodated about 20% of the variance in the rats’ scores for less proficient spatial learning and memory. There were significantly more anomalous cells within right hemisphere below the impact site that were correlated with poorer initial maze learning. Maternal experience reduced the numbers of anomalous cells in the right limbic area only. Conclusion: These results suggest weak mechanical impacts produce changes in histomorphology within some neurons that are still evident two months later and that the presence of these anomalous clusters, corresponding to less than 1% of the cross-sectional area and below the resolution of contemporary MRI in human cases, are strongly correlated with specific behavioural impairments.
Invasive Pneumococcal Disease in Healthy Adults: Increase of Empyema Associated with the Clonal-Type Sweden1-ST306
Imma Grau, Carmen Ardanuy, Laura Calatayud, Dora Rolo, Arnau Domenech, Josefina Liares, Roman Pallares
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0042595
Abstract: Background Adult invasive pneumococcal disease (IPD) occurs mainly in the elderly and patients with co-morbidities. Little is known about the clinical characteristics, serotypes and genotypes causing IPD in healthy adults. Methods We studied 745 culture-proven cases of IPD in adult patients aged 18–64 years (1996–2010). Patients were included in two groups: 1.) adults with co-morbidities, and 2.) healthy adults, who had no prior or coincident diagnosis of a chronic or immunosuppressive underlying disease. Microbiological studies included pneumococcal serotyping and genotyping. Results Of 745 IPD episodes, 525 (70%) occurred in patients with co-morbidities and 220 (30%) in healthy adults. The healthy adults with IPD were often smokers (56%) or alcohol abusers (18%). As compared to patients with co-morbidities, the healthy adults had (P<0.05): younger age (43.5+/?13.1 vs. 48.7+/?11.3 years); higher proportions of women (45% vs. 24%), pneumonia with empyema (15% vs. 7%) and infection with non-PCV7 serotypes including serotypes 1 (25% vs. 5%), 7F (13% vs. 4%), and 5 (7% vs. 2%); and lower mortality (5% vs. 20%). Empyema was more frequently caused by serotype 1. No death occurred among 79 patients with serotype 1 IPD. There was an emergence of virulent clonal-types Sweden1-ST306 and Netherlands7F-ST191. The vaccine serotype coverage with the PCV13 was higher in healthy adults than in patients with co-morbidities: 82% and 56%, respectively, P<0.001. Conclusion In this clinical study, one-third of adults with IPD had no underlying chronic or immunosuppressive diseases (healthy adults). They were often smokers and alcohol abusers, and frequently presents with pneumonia and empyema caused by virulent clones of non-PCV7 serotypes such as the Sweden1-ST306. Thus, implementing tobacco and alcohol abuse-cessation measures and a proper pneumococcal vaccination, such as PCV13 policy, in active smokers and alcohol abusers may diminish the burden of IPD in adults.
Molecular characterization of resistance to Rifampicin in an emerging hospital-associated Methicillin-resistant Staphylococcus aureus clone ST228, Spain
Virginie Mick, M Angeles Domínguez, Fe Tubau, Josefina Liares, Miquel Pujol, Rogelio Martín
BMC Microbiology , 2010, DOI: 10.1186/1471-2180-10-68
Abstract: A sample of representative 108 rifampicin-resistant MRSA isolates belonged to a single PFGE genotype, ST-228, SCCmec type I and spa type t041. Of 108 isolates, 104 (96%) had a low-level rifampicin resistance (MICs, 2 to 4 mg/L) and 4 a high-level rifampicin resistance (MICs, 128 - ≥ 256 mg/L). Disk diffusion and E-test methods failed to identify a low-level rifampicin resistance in 20 and 12 isolates, respectively. A low-level rifampicin resistance was associated with amino acid substitution 481His/Asn in the beta-subunit of RNA polymerase. Isolates with a high-level rifampicin resistance carried additional mutations in the rpoB gene.The emergence of MRSA clone ST228-SCCmecI, related to the Southern Germany clone, involved a therapeutical challenge for treating serious MRSA infections. Decreased susceptibility to rifampicin in MRSA strains of ST228-SCCmecI was associated with one or two specific mutations in the rpoB gene. One fifth of isolates with low-level rifampicin-resistance were missed by the diffusion methods.Methicillin resistant Staphylococcus aureus (MRSA) is an important pathogen in Spanish hospitals. The percentage of patients infected or colonised by MRSA among patients with nosocomial S. aureus has been estimated between 20.2% and 30.5% in nation-wide multicenter studies [1,2].In the Hospital Universitari de Bellvitge MRSA has been endemic since 1990. The majority of strains isolated during the 1990-95 period belonged to the multiresistant Iberian clone. By multilocus sequence typing (MLST) the Iberian clone showed an allelic profile or sequence type (ST) 247, carrying the staphylococcal cassette chromosome mec (SCCmec) type I [3]. Isolates of the Iberian clone exhibited resistance against almost all antibiotics available for MRSA therapy including clindamycin, erythromycin, gentamicin, tobramycin, tetracycline, ciprofloxacin and rifampicin. From 1996 to 2003, the Iberian clone was gradually replaced by isolates of Clonal Complex 5 (ST125 and variants
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