Há benefícios a longo prazo da educação infantil em países de baixa e média renda?

We examine the relationship between participation in early childhood education (ECE) and various long-term outcomes: post-ECE educational attainment, the development of both cognitive and socioemotional skills, and labor market outcomes. The data are from the recent Skills Toward Employability and Productivity surveys of urban adults in 12 low- and middle-income countries. Using OLS regression and propensity score matching techniques, we find suggestive evidence of long-term benefits across countries, as well as mixed evidence within countries. Notably, we find positive and statistically significant associations between ECE participation and post-ECE educational attainment (a mean of 0.9 additional years across countries). We find relatively fewer cases of positive associations between ECE and long-term socioemotional outcomes. The evidence on ECE and labor market outcomes is varied, with positive associations for skill-use but weak associations with earnings. Such mixed results suggest that improvements in the quality of ECE programs are necessary for realizing the full range of long-term benefits. Examinamos la relación entre la participación en la educación de la primera infancia (ECE) y varios resultados a largo plazo: el logro educativo después de la ECE, el desarrollo de habilidades cognitivas y socioemocionales, y los resultados del mercado laboral. Los datos provienen de las recientes encuestas de Habilidades hacia el Empleabilidad y la Productividad de adultos urbanos en 12 países de ingresos bajos y medianos. Encontramos evidencia sugestiva de beneficios a largo plazo en todos los países, así como evidencia mixta dentro de los países. En particular, encontramos asociaciones positivas y estadísticamente significativas entre la participación de ECE y el logro educativo después de la ECE (una media de 0,9 años adicionales en todos los países). Encontramos relativamente pocos casos de asociaciones positivas entre ECE y resultados socioemocionales a largo plazo. La evidencia sobre ECE y los resultados del mercado laboral es variada, con asociaciones positivas para el uso de habilidades pero asociaciones débiles con los ingresos. Estos resultados mixtos sugieren que las mejoras en la calidad de los programas de ECE son necesarias para realizar toda la gama de beneficios a largo plazo.Nós examinamos a relação entre a participação na educação infantil (ECE) e vários resultados a longo prazo: o sucesso escolar após a educação infantil, o desenvolvimento de habilidades cognitivas e sócio-emocionais, e os resultados do mercado de trabalho. Os dados são provenientes de pesquisas recentes sobre Competências para Empregabilidade e Produtividade de adultos urbanos em 12 países de baixa e média renda. Encontramos evidências sugestivas de benefícios a longo prazo em todos os países, bem como evidências mistas nos países. Em particular, encontramos associações positivas e estatisticamente significativas entre a participação no ECE e o desempenho educacional após a ECE (uma média de 0,9 anos adicionais em todos os países). Encontramos relativamente poucos casos de associações positivas entre ECE e resultados socioemocionais de longo prazo. A evidência sobre a ECE e os resultados do mercado de trabalho é mista, com associações positivas para o uso de habilidades, mas associações fracas com a renda. Esses resultados mistos sugerem que melhorias na qualidade dos programas de ECE são necessárias para a obtenção de toda a gama de benefícios a longo prazo

Phytoplankton taxonomic and functional diversity in two shallow alluvial lakes with contrasting river connectivity

The mechanisms behind phytoplankton diversity patterns in natural ecosystems still remain elusive. In two shallow lakes with contrasting river connectivity, we first explored how diversity within each sampling (alfa diversity, α), among samplings (beta diversity, β1), and among hydrological seasons (β2) contributed to the diversity registered throughout the whole year (gamma diversity, γ). Then we estimated the importance of several environmental and temporal factors as structuring factors of these diversity patterns. To do this, we sampled the two lakes—one laterally isolated and other laterally connected lake with the Paraná River System—during a complete hydrological year. For the analyses, we considered both the species and the functional group level. At the species level, temporal variation (β1 + β2) made the main contribution for gamma diversity at the connected lake, possibly related to the constant species input from the river system. For the isolated lake, however, α was the main contributor. Regarding functional groups, α was the most important for both lakes, although no element of gamma diversity was different from the null model. Environmental factors like conductivity, turbidity, nutrient availability, and flood phases appeared as more relevant for the connected lake. Temporal processes (e.g., succession, ecological drift) were critical for the observed diversity patterns in both lakes. These results were consistent particularly considering the taxonomical approach. Our main findings are that the environment influences phytoplankton diversity patterns; however, other dynamics occurring on temporal scales may be more relevant for the phytoplankton community.Fil: Frau, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Pineda, Alfonso. UNIVERSIDADE ESTADUAL DE MARINGÁ (UEM);Fil: Mayora, Gisela Paola. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Devercelli, Melina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentin

The effect of an invading filter-feeding bivalve on a phytoplankton assemblage from the Parana´ system: a mesocosm experiment

The effect of different concentrations of the bivalve Limnoperna fortunei on the algal density and structure and its filtration rate was estimated in a mesocosm experiment. The experiment was carried out using containers of 200 L and three treatments: Control (without bivalves), C1 (with 128 individual bivalves), and C2 (with 256 individual bivalves). Decrease in phytoplankton density was detected in bivalve treatments after 6 h. A decrease of 52% and 86% of the initial density was measured in C1 and C2, respectively, after 48 h. All algae groups showed substantial decrease in densities (>60%) and the composition of the algae assemblages changed in the presence of the bivalve. In particular, there was an increase in the density of Flagellates. The maximum estimated bivalve filtration rate was 357 mL ind−1 h−1 at 28°C. Our results suggest that the invading bivalves could significantly affect both the plankton density and assemblage structure in natural systems.Fil: Frau, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Rojas Molina, Florencia Mercedes. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Devercelli, Melina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Jose, Susana Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentin

Estimation of Health State Utility Values in Fabry Disease Using Vignette Development and Valuation

Background: Health state utilities are measures of health-related quality of life that reflect the value placed on improvements in patients' health status and are necessary for estimation of quality-adjusted life-years. Health state utility data on Fabry disease (FD) are limited. In this study we used vignette (scenario) construction and valuation to develop health state utilities. Objectives: The aim of this study was to use vignette construction and valuation to estimate health state utility values suitable for inclusion in economic models of FD treatments. Methods: Health state vignettes were developed from semistructured qualitative telephone interviews with patients with FD and informed by published literature and input from an expert. Each vignette was valued in an online survey by members of the United Kingdom (UK) general population using the composite time trade-off (TTO) method, which aims to determine the time the respondent would trade to live in full health compared with each impaired health state. Results: Eight adults (50% women) with FD from the UK were interviewed. They were recruited via various approaches, including patient organizations and social media. The interviewees' responses, evidence from published literature, and input from a clinical expert informed the development of 6 health state vignettes (pain, moderate clinically evident FD [CEFD], severe CEFD, end-stage renal disease [ESRD], stroke, and cardiovascular disease [CVD]) and 3 combined health states (severe CEFD + ESRD, severe CEFD + CVD, and severe CEFD + stroke). A vignette valuation survey was administered to 1222 participants from the UK general population who were members of an external surveying organization and agreed to participate in this study; 1175 surveys were successfully completed and included in the analysis. Responses to TTO questions were converted into utility values for each health state. Pain was the highest valued health state (0.465), and severe CEFD + ESRD was the lowest (0.033). Discussion: Overall, mean utility values declined as the severity of the vignettes increased, indicating that respondents were more willing to trade life-years to avoid a severe health state. Conclusions: Health state vignettes reflect the effects of FD on all major health-related quality-of-life domains and may help to support economic modeling for treatment of FD

Can top-down and bottom-up forces explain phytoplankton structure in a subtropical and shallow groundwater-connected lake?

Bottom-up and top-down control of phytoplankton is one of the most important hypothesis that explains and predicts the structure of aquatic community. Our aim was to elucidate whether predation and resource limitation can control phytoplankton composition and abundance in a subtropical shallow lake with groundwater connection to the river system. During 12 months, the lake was sampled at three points. Physico-chemical parameters, phytoplankton and zooplankton were sampled fortnightly, whereas fish were sampled every 3 months. The results showed that Euglenophyta dominated the total biovolume, followed by Dinophyta and Cryptophyta. As for the species composition, Chlorophyta was the dominant group (80 species recorded), followed by phylum Cyanobacteria (26 species recorded). Redundancy analysis (RDA) indicated that temperature and nitrate + nitrite concentration mainly explained biovolume changes, with zooplankton predation not having any measurable effect on phytoplankton during the high-water (HW) period. During low-water (LW) period top-down by fish was more important. At higher taxonomic resolution (species biovolume), phosphorus was another controlling factor. We concluded that phytoplankton in this lake is mainly regulated by hydrological changes as a macrofactor that affects nutrient availability and other environmental conditions. Even though bottom-up top-down forces do not have a central effect, we found evidence of positive nutrient influences at the HW period and fish effect at the LW period.Fil: Frau, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Devercelli, Melina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: José De Paggi, Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; ArgentinaFil: Scarabotti, Pablo Augusto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; ArgentinaFil: Mayora, Gisela Paola. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Battauz, Yamila Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Senn, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentin

Estimation of Health State Utility Values in Fabry Disease Using Vignette Development and Valuation

**Background:** Health state utilities are measures of health-related quality of life that reflect the value placed on improvements in patients’ health status and are necessary for estimation of quality-adjusted life-years. Health state utility data on Fabry disease (FD) are limited. In this study we used vignette (scenario) construction and valuation to develop health state utilities. **Objectives:** The aim of this study was to use vignette construction and valuation to estimate health state utility values suitable for inclusion in economic models of FD treatments. **Methods:** Health state vignettes were developed from semistructured qualitative telephone interviews with patients with FD and informed by published literature and input from an expert. Each vignette was valued in an online survey by members of the United Kingdom (UK) general population using the composite time trade-off (TTO) method, which aims to determine the time the respondent would trade to live in full health compared with each impaired health state. **Results:** Eight adults (50% women) with FD from the UK were interviewed. They were recruited via various approaches, including patient organizations and social media. The interviewees' responses, evidence from published literature, and input from a clinical expert informed the development of 6 health state vignettes (pain, moderate clinically evident FD $$CEFD$$, severe CEFD, end-stage renal disease $$ESRD$$, stroke, and cardiovascular disease $$CVD$$) and 3 combined health states (severe CEFD + ESRD, severe CEFD + CVD, and severe CEFD + stroke). A vignette valuation survey was administered to 1222 participants from the UK general population who were members of an external surveying organization and agreed to participate in this study; 1175 surveys were successfully completed and included in the analysis. Responses to TTO questions were converted into utility values for each health state. Pain was the highest valued health state (0.465), and severe CEFD + ESRD was the lowest (0.033). **Discussion:** Overall, mean utility values declined as the severity of the vignettes increased, indicating that respondents were more willing to trade life-years to avoid a severe health state. **Conclusions:** Health state vignettes reflect the effects of FD on all major health-related quality-of-life domains and may help to support economic modeling for treatment of FD

Estimation of health state utility values in Fabry disease using vignette development and valuation

Background: Health state utilities are measures of health-related quality of life that reflect the value placed on improvements in patients’ health status and are necessary for estimation of quality-adjusted life-years. Health state utility data on Fabry disease (FD) are limited. In this study we used vignette (scenario) construction and valuation to develop health state utilities. Objectives: The aim of this study was to use vignette construction and valuation to estimate health state utility values suitable for inclusion in economic models of FD treatments. Methods: Health state vignettes were developed from semistructured qualitative telephone interviews with patients with FD and informed by published literature and input from an expert. Each vignette was valued in an online survey by members of the United Kingdom (UK) general population using the composite time trade-off (TTO) method, which aims to determine the time the respondent would trade to live in full health compared with each impaired health state. Results: Eight adults (50% women) with FD from the UK were interviewed. They were recruited via various approaches, including patient organizations and social media. The interviewees’ responses, evidence from published literature, and input from a clinical expert informed the development of 6 health state vignettes (pain, moderate clinically evident FD [CEFD], severe CEFD, end-stage renal disease [ESRD], stroke, and cardiovascular disease [CVD]) and 3 combined health states (severe CEFD + ESRD, severe CEFD + CVD, and severe CEFD + stroke). A vignette valuation survey was administered to 1222 participants from the UK general population who were members of an external surveying organization and agreed to participate in this study; 1175 surveys were successfully completed and included in the analysis. Responses to TTO questions were converted into utility values for each health state. Pain was the highest valued health state (0.465), and severe CEFD + ESRD was the lowest (0.033). Discussion: Overall, mean utility values declined as the severity of the vignettes increased, indicating that respondents were more willing to trade life-years to avoid a severe health state. Conclusions: Health state vignettes reflect the effects of FD on all major health-related quality-of-life domains and may help to support economic modeling for treatment of FD

Corporate Governance and Dividend Policy in Peru: Is there any link?

El objetivo del estudio es analizar el impacto de la adopción del Código de Gobierno Corporativo sobre el pago de dividendos en 111 compañías listadas en la Bolsa de Valores de Lima del 2007 al 2015. La metodología escogida incluye un modelo de panel no balanceado, con el ratio de pago de dividendos como variable dependiente y entre las variables independientes la adopción del Código de Gobierno Corporativo y la Calidad del Gobierno Corporativo. Los resultados muestran que las compañías con un Código de Gobierno Corporativo y, especialmente, aquellas con una calidad superior del mismo, han pagado más dividendos, ello a pesar de que el ratio de pago de dividendos siempre presenta una relación negativa con la concentración de propiedad. Sin embargo estos son resultados generales y más estudios deben ser realizados a nivel de industrias para encontrar sus diferencias. Este es el primer estudio que establece una relación entre gobierno corporativo y pago de dividendos en empresas que operan en el Perú. Una implicancia importante para los inversores institucionales es que es aconsejable considerar la adopción y la calidad del Código como un criterio de selección de acciones con el fin de obtener un mayor pago de dividendos en sus inversiones.The objective of the study is to analyze the impact of the adoption of the Corporate Governance Code over the dividend payout ratio in 111 companies listed on the Lima Stock Exchange (LSE) from 2007 to 2015. The chosen methodology includes an unbalanced panel data model with the dividend payout ratio as dependent variable and several independent variables such as the adoption of a Corporate Governance Code and the Corporate Governance Quality. The results show that companies that have adopted a Corporate Governance Code and especially those with a high quality in it pay more dividends despite the fact that the dividend payout always presents a negative relation with the ownership concentration. However, these are overall results and more studies need to be carried out at the industry level to find out differences among them. This is the first study that establishes the relationship between corporate governance and dividend payout in companies operating in Peru. One important implication for institutional investors is that it is advisable to consider the adoption and the quality of the code as stock selection criteria in order to obtain a higher dividend payout from their investments

Diet and feeding selectivity of the Andean Flamingo Phoenicoparrus andinus and Chilean Flamingo Phoenicopterus chilensis in lowland wintering areas

Flamingos Phoenicopteridae sp. are gregarious birds that travel long distances between breeding and feeding sites. Here we describe the diet and feeding selectivity of two flamingo species, the Andean Flamingo Phoenicoparrus andinus and Chilean Flamingo Phoenicopterus chilensis, which coexist in a lowland area of Argentina. Environmental characteristics and available food resources were assessed at twelve lakes where feeding flocks of both species of flamingos occurred. Food items found in faeces (16S rRNA for bacteria and archaea) and microscopic analyses (for Cyanobacteria, microalgae and microinvertebrates) were analysed, and the birds? feeding selectivity and niche overlap were estimated. Results showed that the lakes were of eutrophic to hypereutrophic status, and with hypohaline to mesohaline salinity levels. Predominant microorganisms belonged to the Planctomycetes, Verrucomicrobia, Chloroflexi, Euryarchaeota, Cyanobacteria, Bacillariophyta and Copepoda phyla. Euryarchaeota and Firmicutes were the main phyla found in the faeces, with Chloroflexi and Planctomycetes also present in smaller quantities. Proteobacteria were well represented in Andean Flamingo faeces, but Verrucomicrobia were scarce in both species. Cyanobacteria, Bacillariophyta, Copepoda, Cladocera, and Rotifera were abundant in Chilean Flamingo faeces, and larger organisms belonging to Ostracoda, Nematoda, and Diptera were also found. The most consumed taxa were in the intermediate to large size range (104 to 2×105 μm3, and 108 to 2×108 μm3). Andean Flamingo faeces were composed mainly of microalgae, especially diatoms. Cladocera and Copepoda species were found to a lesser extent, showing the flamingos? preference for intermediate prey sizes (104 to 2×105 μm3). Food selection was probably dependent on the spatial variability in prey availability, as both positive selectivity (for Bacillariophyceae) and avoidance (for Copepoda) were observed in Chilean Flamingos. In contrast, Andean Flamingos showed a high positive selection for diatoms, and strong negative selection for microinvertebrates. Both flamingo species can apparently coexist whilst feeding on a wide spectrum of microorganisms, but trophic niches differed in the amounts of Cyanobacteria, microalgae and microinvertebrates taken. Such a low niche overlap probably contributes to the coexistence of both sympatric species in similar waters.Fil: Polla, Wanda. Universidad Nacional del Litoral; ArgentinaFil: Di Pasquale, Vanesa Anabel. Universidad Nacional del Litoral; ArgentinaFil: Rasuk, Maria Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaFil: Barberis, Ignacio Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Investigaciones en Ciencias Agrarias de Rosario. Universidad Nacional de Rosario. Facultad de Ciencias Agrarias. Instituto de Investigaciones en Ciencias Agrarias de Rosario; ArgentinaFil: Romano, Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Investigaciones para el Descubrimiento de Fármacos de Rosario. Universidad Nacional de Rosario. Instituto de Investigaciones para el Descubrimiento de Fármacos de Rosario; ArgentinaFil: Manzo, Ramiro Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Paggi, Juan Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Farias, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaFil: Contreras, Manuel. Centro de Ecologí­a Aplicada (cea),; ChileFil: Devercelli, Melina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentin

Ensaios em laboratório para o controle de florações algais mediante ultrassom

 An increased development of Cyanophyceae produced by eutrophication of the aquatic environments yields algae blooms and compounds with unpleasant odors and flavors as well as liberation of toxic metabolites. Excessive algae growth is also a problem for water that can be used for human consumption or industrial processes, but treatment for their removal leads to increases in operating costs. In this paper, the use of ultrasound to control algal blooms, in particular Cyanophyceae, at laboratory level is assayed. The results obtained (using a frequency of 20 kHz and a power of 9 W) show that organisms belonging to classes Chrysophyceae, Euglenophyceae and  Chlorophyceae were removed after 5 minutes of exposure, and Raphidiopsis mediterranean within the first 10 minutes, while reduction was 98% for M. aeruginosa and 99% for Dolichospermum spiroides after 60 minutes. El mayor desarrollo de Cyanobacteria generado por la eutroficación de ambientes acuáticos produce, además de afloramientos y compuestos con olores y sabores desagradables, liberación de metabolitos tóxicos. El desarrollo excesivo de algas también es problema para aguas que se pueden utilizar para consumo humano o procesos industriales, pero el tratamiento para su eliminación lleva a aumentos de los costos operativos.  En este trabajo se analiza la utilización en laboratorio del ultrasonido como alternativa viable para controlar el desarrollo de algas, en particular de Cyanobacteria. Los resultados obtenidos (utilizando una frecuencia de 20 kHz y una potencia de 9 W) muestran que los organismos pertenecientes a las Clases Chrysophyceae, Euglenophyceae y Chlorophyceae fueron eliminados a los 5 minutos de exposición, y Raphidiopsis mediterranea dentro de los primeros 10 minutos, en tanto que, luego de 60 minutos, la reducción fue del 98% para M. aeruginosa y del 99% para Dolichospermum spiroides.O maior desenvolvimento de Cianobactéria gerado pela eutroficação de ambientes aquáticos produz, além de afloramentos e compostos com odores e sabores desagradáveis, liberação de metabólitos tóxicos. O desenvolvimento excessivo de algas é também problema para as águas que podem ser utilizadas para consumo humano ou processos industriais, porém o tratamento para sua eliminação acarreta aumentos nos custos operacionais. Neste trabalho é avaliado o uso em laboratório do ultrassom como alternativa viável para controlar o desenvolvimento de algas, principalmente de Cianobacterias. Os resultados obtidos (utilizando uma frequência de 20 kHz e uma potência de 9 W) mostram que os organismos pertencentes às Classes Chrysophyceae, Euglenophyceae e Chlorophyceae foram eliminados após 5 minutos de exposição, e Raphidiopsis mediterrânea dentro dos primeiros 10 minutos, enquanto que, após 60 minutos, a redução foi de 98% para Microcystis aeruginosa e de 99% para Dolichospermum spiroides