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Background: Tooth decay and periodontal disease are currently considered the main causes of tooth loss. Timely prosthetic rehabilitation is the ideal treatment for this problem, as it allows the restoration of lost functions. Objective: to characterize tooth loss in relation to the need for prosthetic treatment. Methods: descriptive, observational, cross-sectional study, carried out with all the patients who attended the El Carmen stomatological consultation, belonging to the Barrio Adentro Mission in the Barinas, Venezuela, from January to June 2018. The age, tooth loss, need for prosthetic treatment and type of prosthesis were analyzed. Results: female sex predominated, represented by 62.4%, and patients aged between 19 and 34 years old, with 48.7%. The loss of 7 and more teeth prevailed in the studied group. The 63.4% required prosthetic treatment, and partial rehabilitation was the most demanded. Conclusion: the conditions of oral health, specifically of tooth loss, in these Venezuelan patients, were characterized by the predominance of the female sex, as well as the youngest. A large number of participants were affected by the absence of seven and more teeth. The need for prosthetic treatment increased with age, with a greater demand for partial prostheses. [ABSTRACT FROM AUTHOR]

The use of educational resources, including interactive keys, encourages the development of skills in the professional training of biology. In this paper, the educational value of interactive keys in the teaching of biology in plant systematic subject of algae and fungi is evaluated. Scores are analysed, main difficulties of laboratory reports and a survey was applied to students who completed the course in the 2015-2016 racecourses in Biology at the University of East. Interactive keys contribute to better educational qualifications are achieved in classes that used it (ANOVA: F = 9.423, df = 74, p = 0.003). In handling, those students select appropriate knowledge for the identification of plant species, allowed them to understand what they learn and can adapt to new situations (making key taxonomic identification or description of specimens). Besides learning it stimulated by increasing professional motivation. The introduction of interactive keys in undergraduate teaching is a good educational practice that allows teachers to fulfil the objectives (instructional and educational) and skills identified in laboratory reports are developed. [ABSTRACT FROM AUTHOR]

The systematic list of the porcelain crabs of the coast of Santiago de Cuba, the taxonomic key for its identification and the notes of its vertical distribution are presented. Four species are added to the porcelain list of the Cuban costs (Neopisosoma angustifrons, Petrolisthes marginatus, P. politus, y P. quadratus). [ABSTRACT FROM AUTHOR]

A characterization of spatial and temporal variation of macroalgae assemblages in the intertidal rocky shore sector Aguadores-Baconao is presented. As a result of this study 47 species were determined, 33 genera and 16 families. 19 species belong to Rhodophyta, 17 to Heterokontophyta and 11 to Chlorophyta. Species like Amphiroa beauvoisii, Centroceras clavulatum, Ceramiun brasiliense, Yuzurua poiteaui, Ceratodictyon intricatum, Gracilaria damaecornis, Laurencia obtusa, Polysiphonia scopulorum, P. sphaerocarpa, Dictyota ciliolata, Anadyomene saldanhae, Chaetomorpha gracilis y Dictyosphaeria ocellata were first recorded in the southeast platform of Cuba. The higher values of species richness were obtained in March (35). The composition of macroalgae varies among months (55% of dissimilarity) and locations (30 to 100% of dissimilarity). These variations respond to the features of the characteristics of the microhabitat and the presence of point pollution sources for nutrient enrichment. [ABSTRACT FROM AUTHOR]