In an octopus's garden in the shade: Underwater image analysis of litter use by benthic octopuses

Benthic octopuses have been widely documented in artificial shelters for decades, and this use is apparently increasing. Despite any possible positive effects, the use of litter as shelter could have negative implications. In this work, we aimed to elucidate the interactions of octopuses with marine litter, identifying types of interactions and affected species and regions. To achieve this, we obtained 261 underwater images from ‘citizen science’ records, and identified 8 genera and 24 species of benthic octopuses interacting with litter. Glass objects were present in 41.6% of interactions, and plastic in 24.7%. Asia presented the highest number of images, and most records were from 2018 to 2021. Citizen science provided important evidence on octopus/marine litter interactions, highlighting its value and the need for more investigations on the subject. This information is fundamental to help prevent and mitigate the impacts of litter on octopuses, and identify knowledge gaps that require attention

The compound Poisson limit ruling periodic extreme behaviour of non-uniformly hyperbolic dynamics

We prove that the distributional limit of the normalised number of returns to small neighbourhoods of periodic points of non-uniformly hyperbolic dynamical systems is compound Poisson. The returns to small balls around a fixed point in the phase space correspond to the occurrence of rare events, or exceedances of high thresholds, so that there is a connection between the laws of Return Times Statistics and Extreme Value Laws. The fact that the fixed point in the phase space is a repelling periodic point implies that there is a tendency for the exceedances to appear in clusters whose average sizes is given by the Extremal Index, which depends on the expansion of the system at the periodic point. We recall that for generic points, the exceedances, in the limit, are singular and occur at Poisson times. However, around periodic points, the picture is different: the respective point processes of exceedances converge to a compound Poisson process, so instead of single exceedances, we have entire clusters of exceedances occurring at Poisson times with a geometric distribution ruling its multiplicity. The systems to which our results apply include: general piecewise expanding maps of the interval (Rychlik maps), maps with indifferent fixed points (Manneville-Pomeau maps) and Benedicks-Carleson quadratic maps.Comment: To appear in Communications in Mathematical Physic

Outflows in the Narrow Line Region of Bright Seyfert Galaxies - I: GMOS-IFU Data

We present two-dimensional maps of emission-line fluxes and kinematics, as well as of the stellar kinematics of the central few kpc of five bright nearby Seyfert galaxies -- Mrk\,6, Mrk\,79, Mrk\,348, Mrk\,607 and Mrk\,1058 -- obtained from observations with the Gemini Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU) on the Gemini North Telescope. The data cover the inner 3\farcs5$\times$5\farcs0 -- corresponding to physical scales in the range 0.6$\times$0.9 to 1.5$\times$2.2\,kpc$^2$ -- at a spatial resolution ranging from 110 to 280 pc with a spectral coverage of 4300 -- 7100\,\AA\ and velocity resolution of $\approx$ 90\,km\,s$^{-1}$. The gas excitation is Seyfert like everywhere but show excitation, but show excitation gradients that are correlated with the gas kinematics, reddening and/or the gas density. The gas kinematics show in all cases two components: a rotation one similar to that observed in the stellar velocity field, and an outflow component. In the case of Mrk607, the gas is counter-rotating relative to the stars. Enhanced gas velocity dispersion is observed in association to the outflows according to two patterns: at the locations of the highest outflow velocities along the ionization axis or perpendicularly to it in a strip centered at the nucleus that we attribute to an equatorial outflow. Bipolar outflows are observed in Mrk\,348 and Mrk\,79, while in Mrk\,1058 only the blueshifted part is clearly observed, while in the cases of Mrk\,6 and Mrk\,607 the geometry of the outflow needs further constraints from modeling to be presented in a forthcoming study, where the mass flow rate and powers will also be obtained.Comment: 20 pages, accepted by MNRA

Controle de nematodeos gastrintestinais em matrizes suinas e sua influencia sobre as leitegadas.

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Synthesis and characterization of new dialkylacylphosphonylhydrazones.

Made available in DSpace on 2019-01-02T23:34:17Z (GMT). No. of bitstreams: 1 Synthesisandcharacterizationofnewdialkylacylphosphonylhydrazones.pdf: 2546236 bytes, checksum: 3827902dcae71a7626ffcbb140b73ae9 (MD5) Previous issue date: 2018-09-24bitstream/item/183428/1/Synthesis-and-characterization-of-new-dialkylacylphosphonylhydrazones.pd

Ação do levamisol sobre infecções por Oesophagostomum dentatum em suínos.

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Germoplasma de manga no Brasil.

O Brasil ocupa atualmente o nono lugar entre os maiores produtores mundiais de manga, com 456 mil toneladas de frutos, o que corresponde a cerca de 2% do total da produção mundial (FAO, 1999). Esta produção, advem em grande parte, de plantios extensivos não comerciais, com elevadas perdas pós-colheita, que atende primordialmente a demanda interna, considerando um consumo per capita de 2,4 kg. A área colhida de manga no Brasil é de 63,5 mil ha, sendo que a maior concentração está na região Nordeste, com 45%, vindo logo a seguir a região Sudeste, com 41%. Porém, os maiores produtores, em ordem decrescente, são os estados de São Paulo, Minas Gerais, Pernambuco, Bahia e Ceará. A região Nordeste lidera também as exportações, com 88% do total da manga brasileira exportada, o que corresponde a US$ 28 milhões .Trabalhos apresentados no I Simpósio Latino Americano sobre Produção de Manga, 1999, Vitória da Conquista

Índice de seleção em progênies de maracujazeiro amarelo.

O gênero Passiflora é o mais importante da família Passifloraceae, em que as espécies de maior expressão comercial são Passiflora edulis Sims (maracujá amarelo ou roxo) e P. alata Curtis (maracujá doce). Esta diversidade de espécies tem proporcionado a seleção e geração de novas variedades melhoradas, utilizando a variabilidade inter e intraespecífica. Progênies de meios-irmãos têm sido comumente utilizadas nos programas de melhoramento da cultura, pela facilidade de aplicação do método, sobretudo na obtenção de numerosas famílias. Após sua obtenção, são feitos testes de progênie e seleção das melhores com base na avaliação de uma série de características. Isto se deve ao fato de que a seleção com base em apenas uma característica não se constitui num critério adequado para representar o mérito econômico de uma planta, pois pode conduzir ao desenvolvimento de tipos economicamente insatisfatórios, seja pela não consideração de outros caracteres de importância econômica ou pelas respostas correlacionadas negativas em outros caracteres. Com o objetivo de continuar com o processo seletivo num conjunto de progênies de meios-irmãos, este trabalho descreve os ganhos genéticos obtidos pelo uso da distância genótipo-ideotipo em onze características relacionadas à qualidade de frutos.PDF.072

Unparticle Searches Through Compton Scattering

We investigate the effects of unparticles on Compton scattering, e gamma -> e gamma based on a future e^+e^- linear collider such as the CLIC. For different polarization configurations, we calculate the lower limits of the unparticle energy scale Lambda_U for a discovery reach at the center of mass energies sqrt(s)=0.5 TeV- 3 TeV. It is shown that, especially, for smaller values of the mass dimension d, (1 <d <1.3), and for high energies and luminosities of the collider these bounds are very significant. As a stringent limit, we find Lambda_U>80 TeV for d<1.3 at sqrt(s)=3 TeV, and 1 ab^(-1) integrated luminosity per year, which is comparable with the limits calculated from other low and high energy physics implications.Comment: Table 1 and 2 have been combined as Table 1, references updated, minor typos have been correcte