Biogeographical interpretation of the distribution of Littoridina (Hydrobiidae), in coastal lakes of Rio Grande do Sul, Brazil

This work aimed to a biogeographical and autecological survey concerning the influence of salinity on Littoridina distribution in the lagoons of Rio Grande do Sul Coastal Plain. Salinity was determined in 71 sample-points corresponding to 42 lagoons, lagunes and connection channels, in the area between Itapeva Lagoon and Peixe Lagoon, through measurements and collections with longitudinal and daily (seasonal) profiles, from November 1978 to March 1980. Concomitantly molluscs were collected and other abiotic parameters were measured. In order to verify the interrelationship between Littoridina distribution and salinity, laboratory bio-assays were carried out, with the collected and acclimatized individuals being submitted to several concentrations. Particular methodological procedures were developed. The present work shows the importance of salinity on biogeographical interpretation of freshwater and brackish water molluscs distribution in Rio Grande do Sul coastal region, using field surveys combined to laboratory autecological tests, and demonstrates the possibility of utilizing the studied species molluscs as salinity bioindicators

NEW EVIDENCES OF POSSIBILITY OF OMEGA-3 ACIDS USE FOR MYOCARDIAL INFARCTION SECONDARY PREVENTION

The metabolism, classification, biomedical implication and clinical application of polyunsaturated fatty acids (PUFAs) were analyzed. It was proved that PUFAs class omega-3 have positive effects on cardiovascular system. First of all, this is an antiarrhythmogenic action, which is accompanied by the increase in variability of heart rhythm. Omega-3 PUFAs cause the reduction in platelet activity and vasoactive mediator release (serotonin, thromboxane A2), vasodilatation, the reduction in inflammatory mediators release and endothelium permeability, the rising of endothelium dependent dilatation of vessels, the depression of vascular response on angiotensine П and noradrenalin. Omega-3 PUFAs are responsible for the reduction in blood pressure, the increase in erythrocytes elasticity, the fall of fibrinogen concentration and normalization of plasma lipid profile. Omega-3 PUFAs in large dozes show antiatherosclerotic effect. Clinical data showing that Omega-3 PUFAs increase in life time due to reduction in sudden death incidence were provided. It is suggested to use Omega-3 PUFAs (OMAKOR) for secondary prevention of ischemic heart disease and treatment of hypertriglyceridemia

O que é o Pampa?

O Pampa visto sob diferentes olhares

Espécies de plantas prioritárias para projetos de restauração ecológica em diferentes formações vegetais no bioma Pampa: primeira aproximação.

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Ornamentais: A conservação e o uso sustentável da diversidade de espécies ornamentais nativas do Bioma Pampa como fator de desenvolvimento no Escudo Sul-rio-grandense.

bitstream/item/151482/1/Gustavo-Heiden-Ornativas.RS.Bio.pd

Nova espécie de Heleobia (Rissooidea, Hydrobiidae) da planície costeira do sul do Brasil New species of Heleobia (Rissooidea, Hydrobiidae) from south plain coast of Brazil

<abstract language="eng">Heleobia robusta, new species from plain coast of Rio Grande do Sul, Brazil, is described. Conchology, conchometry, soft-part morphology including head-food, pallial structures, radula and some aspects of the female and male reproductive systems are provided

Butiás: Conservação e uso sustentável de Butia odorata na região do Litoral Médio do Rio Grande do Sul.

bitstream/item/151483/1/Gustavo-Heiden-Butia.RS.Bio.pd