Making wood inspection easier: FTIR spectroscopy and machine learning for Brazilian native commercial wood species identification.

The molecular structure of wood is mainly based on cellulose, lignin, and hemicellulose. However, low concentrations of lipids, phenolic compounds, terpenoids, fatty acids, resin acids, and waxes can also be found. In general, their color, smell, texture, quantity, and distribution of pores are used in human sensory analysis to identify native wood species, which may lead to erroneous classification, impairing quality control and inspection of commercialized wood. This study developed a fast and accurate method to discriminate Brazilian native commercial wood species using Fourier Transform Infrared Spectroscopy (FTIR) and machine learning algorithms. It not only solves the limitations of traditional methods but also goes beyond as it allows fast analyses to be obtained at low cost and high accuracy. In this work, we provide the identification of five Brazilian native wood species: Angelim-pedra (Hymenolobium petraeum Ducke), Cambara (Gochnatia polymorpha), Cedrinho (Erisma uncinatum), Champagne (Dipteryx odorata), and Peroba do Norte (Goupia glabra Aubl). The results showed the great potential of FTIR and multivariate analysis for wood sample classification; here, the Linear SVM differentiated the five wood species with an accuracy of 98%. The developed method allows industries, laboratories, companies, and control bodies to identify the nature of the wood product after being extracted and semi-manufactured.

Vectores de interés sanitario en la universidad médica de Camagüey: Sus implicaciones epidemiológicas / Vectors of sanitary interest at the medical university of Camagüey: It's epidemiological implications

Se realizaron prospecciones entomológicas y malacológicas en la Universidad Médica de Camagüey dirigidas a detectar especies de vectores de importancia médico-veterinaria, debido a que en la misma cursan estudios jóvenes procedentes de 40 países, en los cuales de ordinario se reportan importantes enfermedades exóticas para nuestro país. Se identificaron 17 especies con marcada relevancia vectorial, 10 pertenecientes al Phylum Arthropoda Stegomyia aegypti, Anopheles albimanus, Culex quinquefasciatus, Cx. nigripalpus, Ochlerotattus taeniorhynchus y Uranotaenia sapphirina (Familia Culicidae), Musca domestica (Familia Muscidae) y Blatella germánica, Periplaneta americana y Periplaneta brunnea (Familia Blattoptera), así como siete pertenecientes al Phylum Mollusca, cinco dulceacuícolas Depanotrema cimex, Depanotrema sp. (Familia Depanotremidae), Tarebia granifera (Familia Thiaridae), Lymnaea cubensis (Familia Lymnaeidae) y Physa cubensis (Familia Physidae), y dos terrestres Zachrysia auricoma (Familia Camaenidae) y Succinea sp. (Familia Succineinae). Los más abundantes y con mayor variedad de especies resultaron ser los mosquitos. Dichas taxa obliga a diseñar e implementar un adecuado programa de vigilancia y control antivectorial, destinado a evitar la propagación de enfermedades exóticas en nuestro territorio y que están bajo vigilancia epidemiológica.