Smart contracts

A smart contract is code deployed in a blockchain environment, or the source code from which such code was compiled

Dark matter from the scalar sector of 3-3-1 models without exotic electric charges

We show that three SU(2) singlet neutral scalars (two CP-even and one CP-odd) in the spectrum of models based on the gauge symmetry SU(3)_c X SU(3)_L X U(1)_X, which do not contain exotic electric charges, are realistic candidates for thermally generated self-interacting dark matter in the Universe, a type of dark matter that has been recently proposed in order to overcome some difficulties of collisionless cold dark matter models at the galactic scale. These candidates arise without introducing a new mass scale in the model and/or without the need for a discrete symmetry to stabilize them, but at the expense of tuning several combinations of parameters of the scalar potential.Comment: RevTeX, 11 pages. v2: typos corrected, one reference added. v3: clarifications added, four more references added. To appear in Europhys. Let

Manual de biossegurança em instalações com certificado de qualidade em biossegurança na Embrapa Arroz e Feijão.

Foi produzido o presente manual de biossegurança para a orientação nas diversas atividades desenvolvidas nas dependências regidas pelo Certificado de Qualidade em Biossegurança (CQB). Esclarece o significado de termos técnicos úteis empregados e apresenta um conjunto de normas e procedimentos que certamente minimizarão os riscos de trabalho e de uma possível liberação acidental de organismos geneticamente modificados.bitstream/CNPAF/26693/1/doc_216.pd