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Search Results: 1 - 10 of 167475 matches for " E. Carloni "
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Resistencia a antimicrobianos en aislamientos de Escherichia coli de origen animal
Carloni,G.; Pereyra,A.; Denamiel,G; Gentilini,E.;
InVet , 2011,
Abstract: antimicrobial susceptibility tests were determined in 100 isolates of e.coli from differents patologies in cattle, horses, dogs and cats, according to clinical and laboratory standards institute. multiresistance isolates were detected in this assay. the antibiotics selected were amikacin, ampicillin /sulbactam, cefotaxime, ciprofloxacin, chloramphenicol, colistin, gentamicin, nitrofurantoin, streptomycin, tetracycline, trimethoprim/sulfamethoxazole. the antibiotic with the highest resistance was tetracycline (34% in cats and 75% in dogs). in isolated strains from dogs and cats it was also found considerable percentages of resistance to ampicilline/ sulbactam (27% in dogs and 53%in cats) and to ciprofloxacine (30%in dogs and 67% in cats). in these isolates it was also found the highest percentage of multiresistance (29% in dogs and 67% in cats). selective pressure originated from the inadecuate use of antibiotics can be responsible for the appearance of resistance, eventhough it is not the only one. it may be possible that e. coli could transmit genes of resistance to antimicrobials agents, although it is unknown if the presence of these genes are permanent or transitory.
Resistencia a antimicrobianos en aislamientos de Escherichia coli de origen animal Antimicrobial resistance of Escherichia coli isolated from animals
G. Carloni,A. Pereyra,G Denamiel,E. Gentilini
InVet , 2011,
Abstract: Se determinó el perfil de susceptibilidad a antimicrobianos de 100 aislamientos de E.coli provenientes de diversas patologías en bovinos, equinos, caninos y felinos, siguiendo metodología del Clinical and Laboratory Standards Institute y detectando la aparición de aislamientos multiresistentes. El panel de antibióticos ensayados incluyó amicacina, ampicilina/sulbactama, cefotaxima, ciprofloxacina, cloranfenicol, colistina, estreptomicina, gentamicina, nitrofurantoína, tetraciclina, trimetoprima/ sulfametoxazol. El mayor porcentaje de resistencia (R) se detectó frente a tetraciclina en aislamientos de todas las especies animales (entre 34% en los de origen felino y 75% de origen equino). En las cepas de origen canino y felino se encontraron porcentajes considerables frente ampicilina/ sulbactama (27% de caninos y 53% de felinos) y ante ciprofloxacina (30% y 67% respectivamente). En estos aislamientos también, se detectó el mayor porcentaje de multiresistencia (29% en caninos y 67% en felinos). La presión selectiva originada por la aplicación inadecuada de antibióticos puede resultar un factor, aunque no el único, responsable de la aparición de R. Además existe la posibilidad de que E.coli pueda constituirse en un eslabón de transmisión de genes de R a antimicrobianos, aunque no se conoce hasta el momento, el origen de ellos, humano o animal y, su permanencia en el tiempo. Antimicrobial susceptibility tests were determined in 100 isolates of E.coli from differents patologies in cattle, horses, dogs and cats, according to Clinical and Laboratory Standards Institute. Multiresistance isolates were detected in this assay. The antibiotics selected were amikacin, ampicillin /sulbactam, cefotaxime, ciprofloxacin, chloramphenicol, colistin, gentamicin, nitrofurantoin, streptomycin, tetracycline, trimethoprim/sulfamethoxazole. The antibiotic with the highest resistance was tetracycline (34% in cats and 75% in dogs). In isolated strains from dogs and cats it was also found considerable percentages of resistance to ampicilline/ sulbactam (27% in dogs and 53%in cats) and to ciprofloxacine (30%in dogs and 67% in cats). In these isolates it was also found the highest percentage of multiresistance (29% in dogs and 67% in cats). Selective pressure originated from the inadecuate use of antibiotics can be responsible for the appearance of resistance, eventhough it is not the only one. It may be possible that E. coli could transmit genes of resistance to antimicrobials agents, although it is unknown if the presence of these genes are permanent or transitory.
Covariant gauge invariant theory of Scalar Perturbations in $f(R)$-gravity: a brief review
Sante Carloni
Physics , 2010, DOI: 10.2174/1874381101003010076
Abstract: I review the state of the art of the investigation on the structure formation in $f(R)$-gravity based on the Covariant and Gauge Invariant approach to perturbations. A critical analysis of the results, in particular the presence of characteristic signature of these models, together with their meaning and their implication is given.
A new approach to the analysis of the phase space of f(R)-gravity
Sante Carloni
Physics , 2015, DOI: 10.1088/1475-7516/2015/09/013
Abstract: We propose a new dynamical system formalism for the analysis of f(R) cosmologies. The new approach eliminates the need for cumbersome inversions to close the dynamical system and allows the analysis of the phase space of f(R)-gravity models which cannot be investigated using the standard technique. Differently form previously proposed similar techniques, the new method is constructed in such a way to associate to the fixed points scale factors, which contain four integration constants (i.e. solutions of fourth order differential equations). In this way a new light is shed on the physical meaning of the fixed points. We apply this technique to some f(R) Lagrangians relevant for inflationary and dark energy models.
Unifying the study of background dynamics and perturbations in $f(R)$-gravity
Sante Carloni,Kishore N. Ananda,Peter K. S. Dunsby,Mohamed E. S. Abdelwahab
Physics , 2008,
Abstract: In this paper we show how the covariant gauge invariant equations for the evolution of scalar, vector and tensor perturbations for a generic $f(R)$-gravity theory can be recast in order to exploit the power of dynamical system methodology. In this way, recent results describing the dynamics of the background FRW model can be easily combined with these equations to reveal important details pertaining to the evolution of cosmological models in fourth order gravity.
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.
Evaluation of HPV Molecular Tests in Primary Screening for Cervical Cancer in Brazil  [PDF]
José E. Levi, Adhemar Longatto-Filho, José Eluf-Neto, Célia L. Rodrigues, Cristina M. Oliveira, Adriana C. Carloni, Adriana T. Lorenzi, Maricy Tacla, José H. Fregnani, Alexandre M. Ab’Saber, Cristovam Scapulatempo, Luisa L. Villa
Open Journal of Obstetrics and Gynecology (OJOG) , 2014, DOI: 10.4236/ojog.2014.48068
Abstract:

Background: Incorporation of HPV tests into cervical cancer screening programs may be advantageous over conventional cytology, especially in developing nations, where the largest burden of cervical cancer is observed. Objectives: To conduct an evaluation of commercially available molecular HPV tests in Brazilian women. Study design: Two groups were recruited: group A was composed of 511 women referred to the clinics because of a previous abnormal Pap test while group B consisted of 2464 subjects under routine screening. Cervical samples were collected using SurePath liquid cytology (LBC) device, and split into aliquots which were submitted to molecular testing by Hybrid Capture and cobas HPV. Colposcopy and biopsies were made according to the standard guidelines, directed by cytological diagnosis. Results: Prevalence of HSIL was 5.97% and 0.7% in Group A and B respectively. High-Risk HPV DNA was found in about 9% of group B women, while in group A this frequency was 24%. Having CIN3+ as the study end-point, the negative predictive values for molecular methods were above 99.8%. All “in-situ” and invasive cervical carcinomas were detected by both HPV nucleic acid assays. Conclusion: Use of HPV DNA testing was feasible and highly sensitive in cancer screening settings of Brazil.

An Improved Parton Shower algorithm in QED
Carlo Michel Carloni Calame
Physics , 2001, DOI: 10.1016/S0370-2693(01)01108-X
Abstract: An improved QED Parton Shower algorithm to calculate photonic radiative corrections to QED processes at flavour factories is described. We consider the possibility of performing photon generation in order to take into account also the effects due to interference between initial and final state radiation. Comparisons with exact order $\alpha$ results are shown and commented.
A first-order secular theory for the post-Newtonian two-body problem with spin -- I: The restricted case
Francesco Biscani,Sante Carloni
Physics , 2013, DOI: 10.1093/mnras/sts198
Abstract: We revisit the relativistic restricted two-body problem with spin employing a perturbation scheme based on Lie series. Starting from a post-Newtonian expansion of the field equations, we develop a first-order secular theory that reproduces well-known relativistic effects such as the precession of the pericentre and the Lense-Thirring and geodetic effects. Additionally, our theory takes into full account the complex interplay between the various relativistic effects, and provides a new explicit solution of the averaged equations of motion in terms of elliptic functions. Our analysis reveals the presence of particular configurations for which non-periodical behaviour can arise. The application of our results to real astrodynamical systems (such as Mercury-like and pulsar planets) highlights the contribution of relativistic effects to the long-term evolution of the spin and orbit of the secondary body.
Dynamical System Analysis of Cosmologies with Running Cosmological Constant from Quantum Einstein Gravity
Alfio Bonanno,Sante Carloni
Physics , 2011, DOI: 10.1088/1367-2630/14/2/025008
Abstract: We discuss a mechanism that induces a time-dependent vacuum energy on cosmological scales. It is based on the instability induced renormalization triggered by the low energy quantum fluctuations in a Universe with a positive cosmological constant. We employ the dynamical systems approach to study the qualitative behavior of Friedmann-Robertson-Walker cosmologies where the cosmological constant is dynamically evolving according with this nonperturbative scaling at low energies. It will be shown that it is possible to realize a "two regimes" dark energy phases, where an unstable early phase of power-law evolution of the scale factor is followed by an accelerated expansion era at late times.
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