Combining type I and type II seesaw mechanisms in the minimal 3-3-1 model

The minimal 3-3-1 model is perturbative until energies around 4-5TeV, posing a challenge to generate neutrino masses at eV scale, mainly if one aims to take advantage of the seesaw mechanism. As a means to circumvent this problem we propose a modification of the model such that it accommodates the type I and type II seesaw mechanisms altogether. We show that the conjunction of both mechanisms yield a neutrino mass expression suppressed by a high power of the cutoff scale, $M^5$, in its denominator. With such a suppression term we naturally obtain neutrino masses at eV scale when $M$ is around few TeV. We also investigate the size of lepton flavor violation through the process $\mu \rightarrow e\gamma$.Comment: about 15 pages, no figure

Spin-polarized transport in ferromagnetic multilayered semiconductor nanostructures

The occurrence of inhomogeneous spin-density distribution in multilayered ferromagnetic diluted magnetic semiconductor nanostructures leads to strong dependence of the spin-polarized transport properties on these systems. The spin-dependent mobility, conductivity and resistivity in (Ga,Mn)As/GaAs,(Ga,Mn)N/GaN, and (Si,Mn)/Si multilayers are calculated as a function of temperature, scaled by the average magnetization of the diluted magnetic semiconductor layers. An increase of the resistivity near the transition temperature is obtained. We observed that the spin-polarized transport properties changes strongly among the three materials.Comment: 3 pages, 4 figure

A Simple Realization of the Inverse Seesaw Mechanism

Differently from the canonical seesaw mechanism, which is grounded in grand unified theories, the inverse seesaw mechanism lacks a special framework that realizes it naturally. In this work we advocate that the 3-3-1 model with right-handed neutrinos has such an appropriate framework to accommodate the inverse seesaw mechanism. We also provide an explanation for the smallness of the $\mu$ parameter and estimate the branching ratio for the rare lepton flavor violation process $\mu \rightarrow e\gamma$.Comment: About 14pages, no figures, basis corrected, to appear at the PR

Efficiency of low versus high airline pressure in stunning cattle with a pneumatically powered penetrating captive bolt gun

The efficiency of stunning cattle was assessed in 443 animals (304 pure Zebu and 139 crossbred cattle), being mainly mature bulls and cows. Cattle were stunned using a Jarvis pneumatically powered penetrating captive bolt gun operating with low (160–175 psi, N = 82) and high (190 psi, N = 363) airline pressure, which was within the manufactures specifications. Signs of brain function and the position of the shots on the heads were recorded after stunning. Velocity of the captive bolt and its physical parameters were calculated. Cattle shot with low pressures showed more rhythmic respiration (27 vs. 8%, P < 0.001), less tongue protrusion (4 vs. 12%, P = 0.03) and less masseter relaxation (22 vs. 48%, P < 0.001). There was an increased frequency of shots in the ideal position when cattle were shot with the low compared to high airline pressures (15.3 vs. 3.1%). Bolt velocity and its physical parameters were significantly (P < 0.01) higher when using high pressure. Airline pressures below 190 psi are inappropriate when shooting adult Zebu beef cattle with pneumatically powered penetrating captive bolt guns

Primeiro relato do Cowpea aphid-borne mosaic virus em feijão-de-metro no estado do Pará.

O feijão-de-metro (Vigna unguiculata (L.) Walp. ssp. unguiculata Verdc. cultigrupo sesquipedalis Westphal) é uma planta anual que chega a medir até 3 metros, da família das leguminosas (Fabaceae). No estado do Pará esta hortaliça vem adquirindo grande valorização, principalmente na mesorregião do nordeste paraense. Várias doenças podem comprometer a sua produtividade e dentre elas as viroses. Em cultivos de feijão-de-metro, localizados no município de Curuçá-PA, observou-se plantas apresentando sintomas de deformação, mosaico, clorose e bolhosidade foliar. O objetivo deste trabalho foi identificar o vírus causador da doença no feijão-demetro. Para isso, realizou-se a diagnose por meio do RT-PCR utilizando-se primers específicos para a detecção do Cowpea aphid-borne mosaic virus (CABMV), que pertence ao gênero Potyvirus. Através da eletroforese em gel de agarose a 0,8% observou-se a banda de DNA esperada de 221pb, confirmando a presença do CABMV no feijão-de-metro. Este é o primeiro relato do CABMV infectando feijão-de-metro no estado do Pará

Caracterização agronômica, morfológica e taxonômica de espécies do horto de plantas medicinais da Embrapa Amazônia Oriental.

A construção de um horto-medicinal possibilita a visualização prática de alguns conteúdos dentro do estudo da Botânica. Este trabalho objetivou realizar a caracterização morfológica, agronômica e taxonômica das plantas existentes no horto da Embrapa Amazônia Oriental. Foram avaliadas taxonômicamente 81 espécies dentro de 38 famílias. Para a caracterização agronômica e morfológica foram criadas tabelas com descritores morfológicos. Os hábitos que se destacaram foram o herbáceo e o arbóreo, a forma, ápice e base de folha que se destacaram foram a elíptica, acuminado, atenuada respectivamente. A filotaxia com maior representatividade foi a oposta. A caracterização efetuada contribuiu para os estudos de domesticação e valor socioeconômico das espécies, contribuindo também para a taxonomia e conservação das mesmas