1,013 research outputs found
The Insular Cortex Controls Food Preferences Independently of Taste Receptor Signaling
The insular cortex (IC) contains the primary sensory cortex for oral chemosensation including gustation, and its integrity is required for appropriate control of feeding behavior. However, it remains unknown whether the role of this brain area in food selection relies on the presence of peripheral taste input. Using multielectrode recordings, we found that the responses of populations of neurons in the IC of freely licking, sweet-blind Trpm5−/− mice are modulated by the rewarding postingestive effects of sucrose. FOS immunoreactivity analyses revealed that these responses are restricted to the dorsal insula. Furthermore, bilateral lesions in this area abolished taste-independent preferences for sucrose that can be conditioned in these Trpm5−/− animals while preserving their ability to detect sucrose. Overall, these findings demonstrate that, even in the absence of peripheral taste input, IC regulates food choices based on postingestive signals
Abate e cortes tradicionais de aves para o consumo caseiro.
bitstream/item/124771/1/ITAV-012.pd
Uso de leitos cultivados no tratamento de efluentes da aquicultura.
In the last fifty years, worldwide aquaculture has increased about 8.8% /year. In Brazil, the tilapia culture, the flagship aquaculture production, represents 39% of the total cultivated fish. The increasing demand for aquatic protein, the demographic increasement and the decline of natural stocks have contributed to the promotion of aquaculture around the world. Nevertheless, concerns about the negative environmental impacts caused by this activity are also increasing. Some of these impacts are: destruction of mangroves, significant inputs of nitrogen, phosphorus and organic matter downstream nurseries, invasion of exotic species in natural aquatic ecosystems. Natural treatment systems such as constructed wetlands are costeffective, do not depend on energy, and the efficiency of removal of the main physico-chemical parameters of water quality are at 70 to 90% on average. By bacteriological metabolism and mechanical filtration, the organic matter is used as food and nutrient for aquatic plants. This study aims to assess the efficiency of constructed wetlands for treatment of effluents from tilapia culture, using a closed cycle of water. At Embrapa Environment (Jaguariúna, SP), a system composed by 54 plastic boxes was constructed to test three kinds of substrates: pebbles, expanded clay and a mixture of both. The plant Vetiver was used as another part of the treatment system. We expect to verify a great reduction in important parameters such as total nitrogen, total phosphorus, biochemical oxygen demand, total suspended solids and others. This system could be very useful at smallholder aquaculture worried with best management practices
Comparação de rações de custo mínimo para frangos de corte, formuladas a partir de tabela nacional e estrangeira.
bitstream/CNPSA/15794/1/publicacao_s3f41g5l.pd
The Top Window for dark matter
We investigate a scenario that the top quark is the only window to the dark
matter particle. We use the effective Lagrangian approach to write down the
interaction between the top quark and the dark matter particle. Requiring the
dark matter satisfying the relic density we obtain the size of the effective
interaction. We show that the scenario can be made consistent with the direct
and indirect detection experiments by adjusting the size of the effective
coupling. Finally, we calculate the production cross section for at the Large Hadron Collider (LHC), which will give rise to an
interesting signature of a top-pair plus large missing energy.Comment: 17 pages including 8 figures; added references and a footnot
Strong Coupling Constant from the Photon Structure Function
We extract the value of the strong coupling constant alpha_s from a
single-parameter pointlike fit to the photon structure function F_2^gamma at
large x and Q^2 and from a first five-parameter full (pointlike and hadronic)
fit to the complete F_2^gamma data set taken at PETRA, TRISTAN, and LEP. In
next-to-leading order and the MSbar renormalization and factorization schemes,
we obtain alpha_s(m_Z)=0.1183 +/- 0.0050(exp.)^+0.0029_-0.0028(theor.)
[pointlike] and alpha_s(m_Z)=0.1198 +/- 0.0028(exp.)^+0.0034_-0.0046(theor.)
[pointlike and hadronic]. We demonstrate that the data taken at LEP have
reduced the experimental error by about a factor of two, so that a competitive
determination of alpha_s from F_2^gamma is now possible.Comment: 11 pages, 2 tables, 2 figures. Version accepted for publication by
Phys. Rev. Let
Analyzing Explosive Volcanic Deposits From Satellite‐Based Radar Backscatter, Volcán de Fuego, 2018
Satellite radar backscatter has the potential to provide useful information about the progression of volcanic eruptions when optical, ground-based, or radar phase-based measurements are limited. However, backscatter changes are complex and challenging to interpret: explosive deposits produce different signals depending on pre-existing ground cover, radar parameters and eruption characteristics. We use high temporal- and spatial-resolution backscatter imagery to examine the emplacement and alteration of pyroclastic density currents (PDCs), lahar and ash deposits from the June 2018 eruption of Volcán de Fuego, Guatemala, using observatory reports and rainfall gauge data to ground truth our observations. We use a temporally dense time series of backscatter data to reduce noise and extract deposit areas. We observe backscatter changes in six drainages, the largest deposit was 11.9-km-long that altered an area of 6.3 urn:x-wiley:21699313:media:jgrb55183:jgrb55183-math-0001 and had a thickness of 10.5 urn:x-wiley:21699313:media:jgrb55183:jgrb55183-math-00022 m in the lower sections as estimated from radar shadows. The 3 June eruption also produced backscatter signal over an area of 40 urn:x-wiley:21699313:media:jgrb55183:jgrb55183-math-0003, consistent with reported ashfall. We use transient patterns in backscatter time series to identify nine periods of high lahar activity in a single drainage system between June and October 2018. We find that the characterisation of subtle backscatter signals associated with explosive eruptions are best observed with (1) radiometric terrain calibration, (2) speckle correction, and (3) consideration of pre-existing scattering properties. Our observations demonstrate that SAR backscatter can capture the emplacement and subsequent alteration of a range of explosive deposits, allowing the progression of an explosive eruption to be monitored
Resummed small-x and first-moment evolution of fragmentation functions in perturbative QCD
We study the splitting functions for the evolution of fragmentation
distributions and the coefficient functions for single-hadron production in
semi-inclusive electron-positron annihilation in massless perturbative QCD for
small values of the momentum fraction and scaling variable x, where their
fixed-order approximations are completely destabilized by huge double
logarithms of the form alpha_s^n 1/x ln^(2n-a) x. Complete analytic all-order
expressions in Mellin-N space are presented for the resummation of these terms
at the next-to-next-to-leading logarithmic accuracy. The poles for the first
moments, related to the evolution of hadron multiplicities, and the small-x
instabilities of the next-to-leading order splitting and coefficient functions
are removed by this resummation, which leads to an oscillatory small-x
behaviour and functions that can be used at N=1 and down to extremely small
values of x. First steps are presented towards extending these results to the
higher accuracy required for an all-x combination with the state-of-the-art
next-to-next-to-leading order large-x results.Comment: 21 pages, LaTeX, 4 figures (.eps). FORM file of main results included
in sourc
Prediction of metabolizable energy values in poultry offal meal for broiler chickens.
Projeto/Plano de Ação: 16.00.300.04-00
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