108 research outputs found
Manejo florestal comunitĂĄrio madeireiro na regiĂŁo TransamazĂŽnica.
bitstream/item/38633/1/ManejFlorestalcomunitario.pdfCartilha
Rapid incorporation of carbon from ectomycorrhizal mycelial necromass into soil fungal communities
Peer reviewedPublisher PD
Utilization of the wastes of vital activity
The recycling of wastes from the biological complex for use in life-support systems is discussed. Topics include laboratory equipment, heat treatment of waste materials, mineralization of waste products, methods for production of ammonium hydroxide and nitric acid, the extraction of sodium chloride from mineralized products, and the recovery of nutrient substances for plants from urine
Retrospective detection of Porcine circovirus 3 (PCV-3) in pig serum samples from Spain
Porcine circovirus 3 (PCVâ3) is an emerging circovirus species that has recently been reported in different countries around the world, suggesting a widespread circulation. In this study, sera samples originating from 654 pigs of different production phases and clinical/pathological conditions, submitted for diagnostic purposes between 1996 and 2017, were randomly selected. Detection of PCVâ3 genome in such samples was attempted with a previously described PCR method, and the partial genome sequence was obtained from selected PCVâ3âpositive samples from different years. Compiled data confirmed that PCVâ3 has been circulating in the Spanish pig population since 1996. The overall frequency of PCVâ3 PCRâpositive samples in the study period was 11.47% (75 of 654). Phylogenetic analysis of twelve PCVâ3 partial sequences obtained showed a high nucleotide identity with the already known PCVâ3 sequences, with minor variations among years. No significant correlation was found between the detection of PCVâ3 and any production phase nor clinical/pathological condition. These results confirm PCVâ3 circulation at least since 1996 in the Spanish pig population with a low/moderate frequency. Although the information obtained was limited, PCVâ3 did not appear to be linked to any specific pathological condition or age group.info:eu-repo/semantics/publishedVersio
Evidence for antiferromagnetism coexisting with charge order in the trilayer cuprate HgBaCaCuO
Multilayered cuprates possess not only the highest superconducting
temperature transition but also offer a unique platform to study disorder-free
CuO planes and the interplay between competing orders with
superconductivity. Here, we study the underdoped trilayer cuprate
HgBaCaCuO and we report the first quantum oscillation
and Hall effect measurements in magnetic field up to 88 T. A careful analysis
of the complex spectra of quantum oscillations strongly supports the
coexistence of an antiferromagnetic order in the inner plane and a charge order
in the outer planes. The presence of an ordered antiferromagnetic metallic
state that extends deep in the superconducting phase is a key ingredient that
supports magnetically mediated pairing interaction in cuprates.Comment: 6+5 pages, 4+6 figure
Quantum oscillations in the linear chain of coupled orbits: the organic metal with two cation layers theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2))
Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear
chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived
systematically taking into account the chemical potential oscillations in
magnetic field. Although corrective terms are observed, basic (alpha) and
magnetic breakdown-induced (beta and 2beta - alpha) orbits can be accounted for
by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in
the explored field and temperature ranges. In contrast, the 'forbidden orbit'
beta - alpha amplitude is described by a non-LK equation involving a product of
two classical orbit amplitudes. Furthermore, strongly non-monotonic field and
temperature dependence may be observed for the second harmonics of basic
frequencies such as 2alpha and the magnetic breakdown orbit beta + alpha,
depending on the value of the spin damping factors. These features are in
agreement with the dHvA oscillation spectra of the strongly 2D organic metal
theta- theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2)).Comment: to be published in Europhysics Letters (2012
A new simple class of superpotentials in SUSY Quantum Mechanics
In this work we introduce the class of quantum mechanics superpotentials
and study in details the cases and 1. The
superpotential is shown to lead to the known problem of two
supersymmetrically related Dirac delta potentials (well and barrier). The
case result in the potentials . For we
present the exact ground state solution and study the excited states by a
variational technic. Starting from the ground state of and using
logarithmic perturbation theory we study the ground states of and also
of and compare the result got by this new way with other results
for this state in the literature.Comment: 18 page
A global multinational survey of cefotaxime-resistant coliforms in urban wastewater treatment plants
The World Health Organization Global Action Plan recommends integrated surveillance programs as crucial strategies for monitoring antibiotic resistance. Although several national surveillance programs are in place for clinical and veterinary settings, no such schemes exist for monitoring antibiotic-resistant bacteria in the environment. In this transnational study, we developed, validated, and tested a low-cost surveillance and easy to implement approach to evaluate antibiotic resistance in wastewater treatment plants (WWTPs) by targeting cefotaxime-resistant (CTX-R) coliforms as indicators. The rationale for this approach was: i) coliform quantification methods are internationally accepted as indicators of fecal contamination in recreational waters and are therefore routinely applied in analytical labs; ii) CTX-R coliforms are clinically relevant, associated with extended-spectrum ÎČ-lactamases (ESBLs), and are rare in pristine environments. We analyzed 57 WWTPs in 22 countries across Europe, Asia, Africa, Australia, and North America. CTX-R coliforms were ubiquitous in raw sewage and their relative abundance varied significantly (<0.1% to 38.3%), being positively correlated (p < 0.001) with regional atmospheric temperatures. Although most WWTPs removed large proportions of CTX-R coliforms, loads over 103 colony-forming units per mL were occasionally observed in final effluents. We demonstrate that CTX-R coliform monitoring is a feasible and affordable approach to assess wastewater antibiotic resistance status
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