Resumo Sistemas de informação são fundamentais para o gerenciamento dos acervos biológicos das instituições de pesquisas em biodiversidade, uma vez que elas vêm fazendo investimentos significativos nos processos de informatização e digitalização de suas coleções. Os sistemas de bancos de dados de herbários e de jardins botânicos têm evoluído no sentido de disponibilizar online os dados de exsicatas e das coleções correlatas, além de suas imagens. Neste trabalho é apresentada a nova versão do Jabot, o sistema de gerenciamento de coleções botânicas desenvolvido no Jardim Botânico do Rio de Janeiro. O sistema reflete hoje o conhecimento adquirido por uma equipe multidisciplinar composta de botânicos e profissionais da área de computação, em uma década de uso intensivo no gerenciamento do conteúdo digital e na curadoria do herbário.

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We report calculations for the elastic collision of low-energy positrons by acetone (C3H6O). For this purpose, the Schwinger multichannel method was used in the static plus polarization approach to calculate cross sections in the energy range from 10–4 to 10 eV. Acetone is a polar molecule, and the effect of the long-range dipole interaction was taken into account through the Born-closure scheme. Our integral cross section was compared with the experimental total cross section results available in the literature, which do not agree among themselves below 2 eV. Our results agree qualitatively well with the most recent experimental data available in all energy regions. Particularly, below the positronium formation channel threshold, when the experimental data are corrected because of the angular resolution of the apparatus, the quantitative agreement is improved.

This article provides a quantitative description of flora specimens stored in the Jardim Botânico of Rio de Janeiro Herbarium that belongs to the Federal Conservation Units of Caatinga’s phytogeography domain. The Caatinga represents 11% of Brazilian territory and is, in South America, the largest and most biodiverse semi-arid tropical ecoregion, yet only 5% of its territory is covered by Federal Conservation Units, with few collections of flora samples. Thus, providing a georeferenced inventory of existing collections is essential for purposes of species distribution, environmental management and conservation. The aim of this data paper is to gauge, by means of geographic coordinates correction and retrieval of the flora specimens present in the RB Herbarium, the amount of specimen gatherings performed in the Federal Conservation Units belonging to the Caatinga domain. Currently, the RB data is publicly available online at several biodiversity portals, such as our institutional database JABOT, the Reflora Virtual Herbarium, the SiBBr and the GBIF portal (Lanna et al. 2019). However, a description of the dataset that belongs to the Federal Conservation Units of Caatinga’s phytogeography domain as a whole is not yet available in the literature.

This work reports a theoretical investigation on the elastic-positron collision with the 1,1-difluoroethylene molecule for energies up to 10 eV. We have employed the Schwinger multichannel method in the static-plus polarization level of approximation to obtain the integral and differential cross sections. In order to account for the long-range potential due to the permanent dipole moment of the target, the Born-closure procedure has been employed. Also, our present differential cross sections have been applied to estimate a correction to the total cross section measurements available in the literature.

Many biological collections databases feature data quality problems. On the existing computational resources, we present an import tool and data validation. The program applies filters to data submitted through a spreadsheet at the time of data import, streamlining the error-checking process. The validations presented were divided into three categories according to the taxonomic, geographical and general specimen collection data. Its implementation eliminated the errors in the data entry of new vouchers in the Herbarium of the Botanical Garden of Rio de Janeiro.

Índice de prenhez de vacas utilizando progesterona após a IATF. Pregnancy index of cows using progesterone after fixed-time artificial insemination.