Enumeration and characterization of arsenic-tolerant diazotrophic bacteria in a long-term heavy-metal-contaminated soil

The abundance of arsenic-tolerant diazotrophic bacteria was compared in a long-term contaminated soil versus a non-contaminated one. In addition, the characterization of tolerant diazotrophic bacteria was carried out. Differences in the number of heterotrophic N2 fixers were found between soils. Contaminated soil showed a decrease in the microbial population size of about 80%, confirming the great sensitivity of this group of soil bacteria to metals. However, quantitative analysis of the response to increased doses of arsenic reveals that the proportion of the culturable diazotrophic community tolerant to arsenic was identical for both soils (contaminated and non-contaminated). Twentytwo arsenic-tolerant diazotrophic isolates were obtained and further characterized. 16S ribosomal DNA sequence analysis revealed that these bacterial isolates were distributed among four taxons (Actinobacteria, Firmicutes, γ-Proteobacteria, and β-Proteobacteria). Most genera recovered from the contaminated soil were also found in the uncontaminated soi

Niche partitioning and coexistence of two spiders of the genus peucetia (araneae, oxyopidae) inhabiting trichogoniopsis adenantha plants (asterales, asteraceae)

Niche theory suggests that the coexistence of ecologically similar species in the same site requires some form of resource partitioning that reduces or avoids interspecific competition. Here, from July 2013 to December 2015, we investigated spatial niche differentiation at three different scales of two sympatric congeneric spiders, Peucetia rubrolineata and P. flava, along an altitudinal gradient in shaded and open areas in an Atlantic forest in Serra do Japi, SP, Brazil. These spiders are peculiar in that they present an exclusive association with the plant Trichogoniopsis adenantha (Asteraceae). In theory, the coexistence of two Peucetia species could be explained by: (1) microhabitat segregation with individuals from different species occupying different parts of the same plants; (2) mesohabitat segregation with different species using plant in different environments; (3) macrohabitat segregation, where different species would not co-occur along the altitudinal gradient. With respect to micro-habitat use, in both species, different instars used different plant parts, while the same instars of both species used the same type of substrate. However, the two Peucetia species segregated by meso-habitat type, with P. rubrolineata preferring T. adenantha plants in shaded areas and P. flava preferring those in open areas. Our results support the hypothesis of niche partitioning begetting diversity, and highlight the importance of analyzing habitat use at multiple scales to understand mechanisms related to coexistence1410CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPnão temnão temnão te

Geometric Quantization of Topological Gauge Theories

We study the symplectic quantization of Abelian gauge theories in $2+1$ space-time dimensions with the introduction of a topological Chern-Simons term.Comment: 13 pages, plain TEX, IF/UFRJ/9

O USO DO MÉTODO GEOSSISTÊMICO NA COMPARTIMENTAÇÃO AMBIENTAL DO MUNICÍPIO DE COREAÚ, CEARÁ.

O estudo tem como objetivo identificar e caracterizar as unidades geoambientais existentes no Município de Coreaú – Ceará, através da metodologia geossistêmica proposta por Bertrand - onde seu método de análise da paisagem é feito de forma sistêmica considerando a relação existente entre os elementos que a compõem. Neste caso refere-se ao relevo de áreas do semiárido nordestino, no qual tem no seu processo de formação a atuação do clima em sua pedogênese e na predominância no intemperismo físico

Síndrome De Transfusão Feto-fetal: Neurodesenvolvimento De Lactentes Tratados Com Cirurgia A Laser

To assess the neurodevelopmental functions of survivors of twin-twin transfusion syndrome (TTTS) treated by fetoscopic laser coagulation (FLC), during the first year of life, comparing them to a control group; and to verify the influence of specific variables on neurodevelopment. Method: This was a prospective, longitudinal study. The sample comprised 33 monochorionic diamniotic twins who underwent FLC for treatment of TTTS and 22 full-term infants of single-fetus pregnancies. Bayley Scales of Infant and Toddler Development Screening Test were used for evaluation. Prenatal, perinatal and postnatal information were obtained. Results: There was an increased frequency of infants in the TTTS group with inadequate performance compared to the control group. The identified variables (fetal donor, low economic income and cardiorespiratory disease) negatively impacted expressive communication and fine motor skills. Conclusion: Although through follow-up is recommended in all TTTS survivors, particular attention is required for the high-risk group as defined in this study. © 2016, Associacao Arquivos de Neuro-Psiquiatria. All rights reserved.74430731

Symplectic Quantization of Open Strings and Noncommutativity in Branes

We show how to translate boundary conditions into constraints in the symplectic quantization method by an appropriate choice of generalized variables. This way the symplectic quantization of an open string attached to a brane in the presence of an antisymmetric background field reproduces the non commutativity of the brane coordinates.Comment: We included a comparison with previous results obtained from Dirac quantization, emphasizing the fact that in the symplectic case the boundary conditions, that lead to the non commutativity, show up from the direct application of the standard method. Version to appear in Phys. Rev.

COLCHICINA: INTOXICAÇÃO E ÓBITO, RELATO DE CASO

B. I., de 67 anos, foi internado em um hospital no interior do Estado do Paraná, apresentando dor abdominal, vômitos e diarréia intensa, vindo a falecer após 4h de internamento. Após investigação do médico sanitarista, constatou-se que a vítima havia começado tratamento com cápsulas manipuladas com o princípio ativo colchicina. Análise por cromatografia líquida de alta resolução (HPLC) indicou positividade para colchicina nas cápsulas, com concentração média de 63,48mg e negativo no material biológico da vítima. A intoxicação por colchicina foi confirmada através dos exames anátomo patológico, sintomatologia apresentada no período de internamento e a alta dosagem de colchicina encontrada nas cápsulas manipuladas e ainda disponíveis. COLCHICINE: INTOXICATION AND DEATH, CASE REPORT Abstract B. I., sixty-seven years old, was taken to a hospital with abdominal cramps, vomiting and intense diarrhoea; he died four hours after being admitted in the emergency ward. After some medical investigation, it became known that the patient had started a treatment with colchicine in capsules prepared by a pharmacist. The capsules and the autopsy materials were analysed by High Performance Liquid Chromatography (HPLC) and the analytical results for the capsules were positive for colchicine with mean concentration of 63,48mg/capsule; the analytical results for the autopsy materials were negative for colchicine. The fatal colchicine intoxication was confirmed by the anatomo-pathological exams carried out in the autopsy materials, by the sintomatology presented by the patient during his staying in the hospital and by the high concentration of colchicine found in the still remaining capsules

A Comment on the Topological Phase for Anti-Particles in a Lorentz-violating environment

Recently, a scheme to analyse topological phases in Quantum Mechanics by means of the non-relativistic limit of fermions non-minimally coupled to a Lorentz-breaking background has been proposed. In this letter, we show that the fixed background, responsible for the Lorentz-symmetry violation, may induce opposite Aharonov-Casher phases for a particle and its corresponding antiparticle. We then argue that such a difference may be used to investigate the asymmetry for particle/anti-particle as well as to propose bounds on the associated Lorentz-symmetry violating parameters.Comment: 4 pages - A published versio

A quantum-like description of the planetary systems

The Titius-Bode law for planetary distances is reviewed. A model describing the basic features of this rule in the "quantum-like" language of a wave equation is proposed. Some considerations about the 't Hooft idea on the quantum behaviour of deterministic systems with dissipation are discussed.Comment: LaTex file, 17 pages, no figures. Version published in Foundations of Physics, August 200