Desempenho de cultivares de mini tomate em condições de verão do Submédio do Vale do São Francisco.

O presente trabalho se propõe avaliar cultivares de mini tomate, com hábito de crescimento determinado, em condições de verão no Submédio do Vale do São Francisco.Suplemento. Edição dos Anais do 53 Congresso Brasileiro de Olericultura, jul. 2014

Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence

International audienceWe obtained high resolution ELODIE and CORALIE spectra for both components of 20 wide visual binaries composed of an F-, G- or K-dwarf primary and an M-dwarf secondary. We analyse the well-understood spectra of the primaries to determine metallicities ([Fe/H]) for these 20 systems, and hence for their M dwarf components. We pool these metallicities with determinations from the literature to obtain a precise (±0.2 dex) photometric calibration of M dwarf metallicities. This calibration represents a breakthrough in a field where discussions have had to remain largely qualitative, and it helps us demonstrate that metallicity explains most of the large dispersion in the empirical V-band mass-luminosity relation. We examine the metallicity of the two known M-dwarf planet-host stars, Gl 876 (+0.02 dex) and Gl 436 (-0.03 dex), in the context of preferential planet formation around metal-rich stars. We finally determine the metallicity of the 47 brightest single M dwarfs in a volume-limited sample, and compare the metallicity distributions of solar-type and M-dwarf stars in the solar neighbourhood

Irish orthography: what do teachers and learners need to know about it, and why?

Irish has significant State support, but lacks a research base to support the teaching of Irish reading. Current approaches to teaching Irish reading are presented, and outcomes summarised. Issues of consistency and complexity in Irish orthography are discussed in light of an analysis of a corpus of early reader texts, and the formulation of rules for discriminating between words which are regular by letter-sound and grapheme-sound rules is outlined. While the most frequent words show a high level of regularity, underlying rules are very complex. The need to target decoding skills early is discussed. Recommendations regarding the teaching of aspects of Irish orthography are presented.Author has checked copyrightAM