Colonização de escleródios de Sclerotinia sclerotiorum por bactérias do solo após cultivo de diferentes genótipos de trigo sob dois níveis de irrigação.

Este trabalho teve como objetivo verificar o efeito do cultivo de trigo sob diferentes níveis de irrigação sobre bactérias do solo antagonistas a S. sclerotiorum

Bound States and Critical Behavior of the Yukawa Potential

We investigate the bound states of the Yukawa potential $V(r)=-\lambda \exp(-\alpha r)/ r$, using different algorithms: solving the Schr\"odinger equation numerically and our Monte Carlo Hamiltonian approach. There is a critical $\alpha=\alpha_C$, above which no bound state exists. We study the relation between $\alpha_C$ and $\lambda$ for various angular momentum quantum number $l$, and find in atomic units, $\alpha_{C}(l)= \lambda [A_{1} \exp(-l/ B_{1})+ A_{2} \exp(-l/ B_{2})]$, with $A_1=1.020(18)$, $B_1=0.443(14)$, $A_2=0.170(17)$, and $B_2=2.490(180)$.Comment: 15 pages, 12 figures, 5 tables. Version to appear in Sciences in China

On negative flows of the AKNS hierarchy and a class of deformations of bihamiltonian structure of hydrodynamic type

A deformation parameter of a bihamiltonian structure of hydrodynamic type is shown to parameterize different extensions of the AKNS hierarchy to include negative flows. This construction establishes a purely algebraic link between, on the one hand, two realizations of the first negative flow of the AKNS model and, on the other, two-component generalizations of Camassa-Holm and Dym type equations. The two-component generalizations of Camassa-Holm and Dym type equations can be obtained from the negative order Hamiltonians constructed from the Lenard relations recursively applied on the Casimir of the first Poisson bracket of hydrodynamic type. The positive order Hamiltonians, which follow from Lenard scheme applied on the Casimir of the second Poisson bracket of hydrodynamic type, are shown to coincide with the Hamiltonians of the AKNS model. The AKNS Hamiltonians give rise to charges conserved with respect to equations of motion of two-component Camassa-Holm and two-component Dym type equations.Comment: 20 pages, Late

Morfometria e endocrinologia de jacaré-tinga (Caiman crocodilus) em cativeiro.

Os crocodilianos estão no topo da cadeia alimentar, sendo controladores ecológicos. Entretanto, apesar de sua importância, nos anos 90 todas as espécies encontravam-se sob risco de extinção, e listadas nos Apêndices 1 e 2 da CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora), devido seu valor comercial. Neste contexto, o estímulo à criação em cativeiro foi uma das alternativas vislumbradas para promover a conservação e exploração desses animais. Portanto, este estudo objetivou analisar dados morfométricos e endocrinológicos do jacaré-tinga em cativeiro, por meio da atualização à luz da literatura atual do documento base, tese da Dr.ª Maria das Dores Correia Palha defendida na Universidade Federal de Pernambuco intitulada ?Jacaré-tinga (Caiman Crocodilus Crocodilus Linnaeus, 1758) em cativeiro na Amazônia Oriental: Biologia Geral e Reprodutiva?. Foram realizadas buscas, em bases científicas, de material bibliográfico publicado entre 1998 e 2014. Por meio da análise das bibliografias, atualizaram-se as informações contidas no documento base e produziram-se três minutas de artigos científicos. Foi possível observar que o cenário da pesquisa com jacaré-tinga em cativeiro não sofreu fortes alterações, pois pesquisas com a espécie ex-situ são escassas e que o documento base apresenta dados ainda cientificamente sustentados até o momento

Caracterização e classificação dos solos do Campo Experimental da Embrapa Acre, Rio Branco, Estado do Acre.

bitstream/item/66701/1/Oriental-Doc122.pdfAnexo: Mapa semidetalhado dos solos da área do Campo Experimental do CPAF- Acre

Risk of adverse events among older adults following co-prescription of clarithromycin and statins not metabolized by cytochrome P450 3A4

Background: The cytochrome P450 3A4 (CYP3A4) inhibitor clarithromycin may also inhibit liverspecific organic anion-transporting polypeptides (OATP1B1 and OATP1B3). We studied whether concurrent use of clarithromycin and a statin not metabolized by CYP3A4 was associated with an increased frequency of serious adverse events. Methods: Using large health care databases, we studied a population-based cohort of older adults (mean age 74 years) who were taking a statin not metabolized by CYP3A4 (rosuvastatin [76% of prescriptions], pravastatin [21%] or fluvastatin [3%]) between 2002 and 2013 and were newly prescribed clarithromycin (n = 51 523) or azithromycin (n = 52 518), the latter an antibiotic that inhibits neither CYP3A4 nor OATP1B1 and OATP1B3. Outcomes were hospital admission with a diagnostic code for rhabdomyolysis, acute kidney injury or hyperkalemia, and allcause mortality. All outcomes were assessed within 30 days after co-prescription. Results: Compared with the control group, patients co-prescribed clarithromycin and a statin not metabolized by CYP3A4 were at increased risk of hospital admission with acute kidney injury (adjusted relative risk [RR] 1.65, 95% confidence interval [CI] 1.31 to 2.09), admission with hyperkalemia (adjusted RR 2.17, 95% CI 1.22 to 3.86) and all-cause mortality (adjusted RR 1.43, 95% CI 1.15 to 1.76). The adjusted RR for admission with rhabdomyolysis was 2.27 (95% CI 0.86 to 5.96). The absolute increase in risk for each outcome was small and likely below 1%, even after we considered the insensitivity of some hospital database codes. Interpretation: Among older adults taking a statin not metabolized by CYP3A4, co-prescription of clarithromycin versus azithromycin was associated with a modest but statistically significant increase in the 30-day absolute risk of adverse outcomes

Nematic fluctuations and phase transitions in LaFeAsO: A Raman scattering study

Raman scattering experiments on LaFeAsO with distinct antiferromagnetic (TAFM=140 K) and tetragonal-orthorhombic (TS=155 K) transitions show a quasielastic peak (QEP) in B2g symmetry (2 Fe tetragonal cell) that fades away below ∼TAFM and is ascribed to electronic nematic fluctuations. A scaling of the reported shear modulus with the T dependence of the QEP height rather than the QEP area indicates that magnetic degrees of freedom drive the structural transition. The large separation between TS and TAFM in LaFeAsO compared to BaFe2As2 manifests itself in slower dynamics of nematic fluctuations in the former

Classical limit for the scattering of Dirac particles in a magnetic field

We present a relativistic quantum calculation at first order in perturbation theory of the differential cross section for a Dirac particle scattered by a solenoidal magnetic field. The resulting cross section is symmetric in the scattering angle as those obtained by Aharonov and Bohm (AB) in the string limit and by Landau and Lifshitz (LL) for the non relativistic case. We show that taking pr_0\|sin(\theta/2)|/\hbar<<1 in our expression of the differential cross section it reduces to the one reported by AB, and if additionally we assume \theta << 1 our result becomes the one obtained by LL. However, these limits are explicitly singular in \hbar as opposed to our initial result. We analyze the singular behavior in \hbar and show that the perturbative Planck's limit (\hbar -> 0) is consistent, contrarily to those of the AB and LL expressions. We also discuss the scattering in a uniform and constant magnetic field, which resembles some features of QCD