Effects of homeopathic preparations on raphidiopsis raciborskii (Cyanobacteria) toxicity in artemia salina mode

Cyanobacteria are microorganisms found in different parts of the world. Some genera are cyanotoxins producers a sodium channel blockingneurotoxin (saxitoxins). Some homeopathic preparations have been identified as remedial action on toxicity models in Artemia salina. This study aimed to observe whether homeopathic products influence the toxicity ofR.raciborskiiextract onA.salinaby inducing cyst hatching arrest, anembryo bioresiliencemodel previously developed in our laboratory (Pinto et al., 2021; Mohammad et al., 2022). Thus, previous toxicity testswere carried out on cysts in 96-well plates, using different concentrations of the extract obtained from regular cultivation of R. raciborskii in HCl 0.05M, whose strain, named T3, is kept in the laboratory of Cyanobacteria at FURGS, Brazil.The standardization of toxin concentration was based on an established scale developed at FURGS, in which the number of T3 filaments is associated withspecific saxitoxin concentrationsdefined by chromatography. The concentration of 2.6 µg/L was chosen since it reducedthe cysthatching rate by 30%, the ideal level to observe embryo bioresilience. Then, a screeningstudy with 22 homeopathic preparations was tested blind in three experimental series, in duplicate,against threecontrols (unchallenged, water,and succussed water)for possible toxicity attenuationon Artemia salinacysts hatching rate. Homeopathic medicines were prepared in pure,sterile water from a stock homeopathic solution, one potency below the working potency. After the 1:100 dilution, 100 succussions were made using a robotic arm (Denise, Autic). The medicines were inserted into the seawater on a 10% basis. Due to the high sensitivity of A. salinato the circalunar variations, all experiments were performed during the first quarter moon. Statistical analysis was performed by two-way ANOVA followed by Tukey, with α=0.05. The most significant results indicative of bioresilience improvement were seen after the treatment with Nitric acidum6 cH, Plumbum metallicum6 cH, isotherapic 200 cH, and hydrochloric acid 1 cH being the last one used as a vehicle of the extracts. Thus, these preparations were chosen to be used in further experiments. In conclusion, the Artemia salinamodel has also beenuseful to study bioresilienceimprovement by homeopathic medicines after intoxication with saxitoxin.

Behavioral alterations induced by repeated saxitoxin exposure in drinking water

Background: Blooms of the saxitoxin-producing cyanobacterium Cylindrospermopsis raciborskii have been contaminating drinking water reservoirs in Brazil for many years. Although acute effects of saxitoxin intoxication are well known, chronic deleterious outcomes caused by repeated saxitoxin exposure still require further investigation. The aim of the present work is to investigate the effects of consumption of drinking water contaminated with C. raciborskii for 30 days on learning and memory processes in rats. Methods: The effects of saxitoxin (3 or 9 µg/L STX equivalents) or cyanobacteria on behavior was determined using the open field habituation task, elevated plus maze anxiety model task, inhibitory avoidance task, and referential Morris water maze task. Results: No effects of saxitoxin consumption was observed on anxiety and motor exploratory parameters in the elevated plus maze and open field habituation tasks, respectively. However, groups treated with 9 µg/L STX equivalents displayed a decreased memory performance in the inhibitory avoidance and Morris water maze tasks. Conclusions: These results suggest an amnesic effect of saxitoxin on aversive and spatial memories.(AU)

Behavioral alterations induced by repeated saxitoxin exposure in drinking water

Blooms of the saxitoxin-producing cyanobacterium Cylindrospermopsis raciborskii have been contaminating drinking water reservoirs in Brazil for many years. Although acute effects of saxitoxin intoxication are well known, chronic deleterious outcomes caused by repeated saxitoxin exposure still require further investigation. The aim of the present work is to investigate the effects of consumption of drinking water contaminated with C. raciborskii for 30 days on learning and memory processes in rats. Methods The effects of saxitoxin (3 or 9 g/L STX equivalents) or cyanobacteria on behavior was determined using the open field habituation task, elevated plus maze anxiety model task, inhibitory avoidance task, and referential Morris water maze task. Results No effects of saxitoxin consumption was observed on anxiety and motor exploratory parameters in the elevated plus maze and open field habituation tasks, respectively. However, groups treated with 9 g/L STX equivalents displayed a decreased memory performance in the inhibitory avoidance and Morris water maze tasks. Conclusions These results suggest an amnesic effect of saxitoxin on aversive and spatial memories.

Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil

Background Toxic cyanobacterial blooms are recurrent in Patos Lagoon, in southern Brazil. Among cyanotoxins, [D-Leu1] microcystin-LR is the predominant variant whose natural cycle involves water and sediment compartments. This study aimed to identify and isolate from sediment a bacterial strain capable of growing on [D-Leu1] microcystin-LR. Sediment and water samples were collected at two distinct aquatic spots: close to the Oceanographic Museum (P1), in Rio Grande City, and on São Lourenço Beach (P2), in São Lourenço do Sul City, southern Brazil. Methods [D-Leu1] microcystin-LR was isolated and purified from batch cultures of Microcystis aeruginosastrain RST9501. Samples of water and sediment from Rio Grande and São Lourenço do Sul were collected. Bacteria from the samples were allowed to grow in flasks containing solely [D-Leu1] microcystin-LR. This strain named DMSX was isolated on agar MSM with 8 g L1 glucose and further purified on a cyanotoxin basis growth. Microcystin concentration was obtained by using the ELISA immunoassay for microcystins whereas bacterial count was performed by epifluorescence microscopy. The genus Pseudomonas was identified by DNA techniques. Results Although several bacterial strains were isolated from the samples, only one, DMXS, was capable of growing on [D-Leu1] microcystin-LR. The phylogenetic analysis of the 16S rRNA gene from DMXS strain classified the organism as Pseudomonas aeruginosa. DMXS strain incubated with [D-Leu1] microcystin-LR lowered the amount of toxin from 1 g.L1 to 0.05 g.L1. Besides, an increase in the bacterial countfrom 71×105 bacteria.mL1 to 117×105 bacteria.mL1was observed along the incubation. Conclusions The use of bacteria isolated from sediment for technological applications to remove toxic compounds is viable. Studies have shown that sediment plays an important role as a source of bacteria capable of degrading cyanobacterial toxins. This is the first Brazilian report on a bacteriumof the genus Pseudomonasthat can degrade [D-Leu1] microcystin-LR, the most frequent microcystin variant in Brazilian freshwaters.

Antimycobacterial and cytotoxicity activity of microcystins

Background: The present work aimed to evaluate the antimycobacterial activity and cytotoxicity of Microcystis aeruginosa toxins, the MC-LR variant and purified extract of [D-Leu1] microcystin-LR. Methods: The antimicrobial activity of M. aeruginosa extract and microcystin was evaluated by resazurin microtiter assay against Mycobacterium tuberculosis, M. terrae, M. chelonae and M. kansasii. The cytotoxicity assay was performed by trypan blue exclusion against the HTC cell line. Results: Antimicrobial activity was observed in the hexanic extract of M. aeruginosa (RST 9501 strain) against M. tuberculosis, including sensitive and resistant strains with minimal inhibitory concentrations (MIC) between 1.93 μM and 0.06 μM. The high activity of M. aeruginosa hexanic extract could be attributed to the major presence of the toxins MC-LR and [D-Leu1] MC-LR that showed activity at MIC between 53 and 0.42 μM against tested mycobacterial strains. Even at the highest concentration tested, no toxicity of M. aeruginosa extracts was identified against HTC cells. Conclusions: These preliminary results suggest that [D-Leu1] MC-LR is a promising candidate for the development of a new antimycobacterial agent.

Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil

Background: Toxic cyanobacterial blooms are recurrent in Patos Lagoon, in southern Brazil. Among cyanotoxins, [D-Leu1] microcystin-LR is the predominant variant whose natural cycle involves water and sediment compartments. This study aimed to identify and isolate from sediment a bacterial strain capable of growing on [D-Leu1] microcystin-LR. Sediment and water samples were collected at two distinct aquatic spots: close to the Oceanographic Museum (P1), in Rio Grande City, and on São Lourenço Beach (P2), in São Lourenço do Sul City, southern Brazil. Methods: [D-Leu1] microcystin-LR was isolated and purified from batch cultures of Microcystis aeruginosastrain RST9501. Samples of water and sediment from Rio Grande and São Lourenço do Sul were collected. Bacteria from the samples were allowed to grow in flasks containing solely [D-Leu1] microcystin-LR. This strain named DMSX was isolated on agar MSM with 8 g L−1 glucose and further purified on a cyanotoxin basis growth. Microcystin concentration was obtained by using the ELISA immunoassay for microcystins whereas bacterial count was performed by epifluorescence microscopy. The genus Pseudomonas was identified by DNA techniques. Results; Although several bacterial strains were isolated from the samples, only one, DMXS, was capable of growing on [D-Leu1] microcystin-LR. The phylogenetic analysis of the 16S rRNA gene from DMXS strain classified the organism as Pseudomonas aeruginosa. DMXS strain incubated with [D-Leu1] microcystin-LR lowered the amount of toxin from 1 μg.L−1 to < 0.05 μg.L−1. Besides, an increase in the bacterial count–from 71 × 105 bacteria.mL−1 to 117 × 105 bacteria.mL−1–was observed along the incubation. Conclusions: The use of bacteria isolated from sediment for technological applications to remove toxic compounds is viable. Studies have shown that sediment plays an important role as ...

Perfil de ácidos graxos e teor de colesterol de mortadela elaborada com óleos vegetais / Fatty acid profile and cholesterol content of mortadella prepared with vegetable oils

Os objetivos deste trabalho foram avaliar o perfil de ácidos graxos e o teor de colesterol em mortadelas elaboradas com diferentes óleos vegetais. Nove tratamentos de mortadela foram elaborados com quatro diferentes óleos vegetais (canola, linhaça, oliva e soja), em dois níveis de substituição (50% e 100%). Os ácidos graxos e o teor de colesterol foram separados e identificados por cromatografia gasosa. Houve predominância dos ácidos graxos oleico, linoleico e palmítico. O teor de ácidos graxos saturados foi menor nos produtos que continham óleos vegetais. A relação PUFA/SFA foi menor no tratamento controle, enquanto que o maior valor foi observado no tratamento com 100% de óleo de linhaça. Os teores de colesterol encontrados foram semelhantes entre todos os tratamentos, sendo superior apenas no tratamento contendo 100% de óleo de soja. Logo, exceto o tratamento com 100% de óleo de soja, todos os outros tratamentos com óleos vegetais apresentaram uma melhor qualidade nutricional quando comparados com o controle.

The aim of this study was to evaluate the fatty acid profile and the cholesterol content of mortadella prepared with different vegetable oils. Nine treatments were made with four different vegetable oils (canola, linseed, olive and soy) using two substitution levels (50% and 100%). The fatty acids and the cholesterol content were separated and identified by gas chromatography. There was a prevalence of the oleic, linoleic and palmitic fatty acids. The saturated fatty acids were lower in the products with vegetable oils. The PUFA/SFA relation was lower in the control treatment while the higher value was observed in the 100% linseed oil treatment. The cholesterol levels found were similar between all the treatments, but a reduction of these levels were observed in the treatments, being superior only in treatment containing 100% of soybean oil. Thus, except the treatment with 100% of soybean oil, all the other treatments with vegetable oils showed a better nutritional quality in relation to the control treatment.

Situação da rêde pública de assistência médico-sanitária na área metropolitana da Grande São Paulo / Situation of the public health medical care at the Great São Paulo Metropolitan area, Brazil

A situação da rêde pública de Assistência Médico-Sanitária é analisada para a área metropolitana da Grande São Paulo, constituída por 37 municípios, com uma população de 8 milhões de habitantes. Existe para a área uma unidade sanitária do tipo Centro ou Sub-Centro de Saúde para cada 101.025 habitantes. Não há uma proporção homogênea entre o tamanho da população e o número de unidades sanitárias, pois existem sub-regiões que apresentam desde 22.000 até 136.142 habitantes por Pôsto de Saúde. O número de postos de assistência materno-infantil é de 232, havendo uma unidade para cada 34.400 habitantes, variando esta proporção por sub-região desde 2.444 até 73.500 habitantes por Pôsto. Há um dispensário de tuberculose para cada 380.048 habitantes. A sub-região Norte, com 67.000 habitantes, não conta com nenhum dispensário de tuberculose. Quanto ao Dispensário de Dermatologia Sanitária a proporção de habitantes por unidade é de 570.071. As sub-regiões Norte e Sudoeste, com 155.000 habitantes, não possuem nenhum dispensário de dermatologia sanitária. Observa-se a inexistência de critérios locacionais para as Unidades Sanitárias, a par do déficit quantitativo e qualitativo do atendimento. Foram apontados, entre os principais objetivos da reforma administrativa da Secretaria de Saúde do Estado, descongestionamento da cúpula, centralização normativa, descentralização executiva e integração em nível local das unidades sanitárias. Observou-se que se encontram integrados, física e funcionalmente, somente 25,6 por cento dos Centros de Saúde, 40 por cento dos Sub-Centros, 42,8 por cento dos Dispensários de Tuberculose e 42,8 por cento dos Dispensários de Dermatologia Sanitária. De acôrdo com estudo realizado pela Secretaria da Saúde, em 1970, somente 4,7 por cento dos atendimentos foi considerado ótimo; 62,7 por cento das unidade sanitárias não possuíam material suficiente e 52,3 por cento não contavam com recursos humanos de acôrdo com a lotação prevista de pessoal. A par dêste quadro carencial, observou-se falta de coordenação entre os podêres públicos responsáveis pelas unidades sanitárias, levando a supercobertura de algumas áreas e o total abandono de outras.

Mortalidad por causas violentas en adolescentes y jóvenes: un desafio para la región de las Américas / Mortality from violent causes in adolescents and young people: a challenge for the Region of the Americas

Este trabajo describe la tendencia de la mortalidad por homicidios, suicidios, accidentes de tráfico y otras causas externas, en la población total, adolescente y joven, de 16 países de la Región de las Américas. Se utiliza información del período comprendido entre los años 1980 y para el ultimo año disponible de la decada de 1990, proveniente del Banco de Datos de la Organización Panamericana de la Salud. Se realiza una descripción diferencial de los subgrupos de adolescentes y jóvenes, por edad y sexo. Los resultados demuestran que en la mayor parte de los países (Canadá, EEUU, Ecuador, México, Chile, Costa Rica, Trinidad & Tobago y El Salvador) hay una tendencia decreciente en la mortalidad por causas externas, tanto en la población total como en adolescentes y jóvenes. Colombia y Brasil son los únicos países analisados que presentam tasas de mortalidad por causas externas francamente ascendentes en los grupos estudiados. Los países con mayores tasas de mortalidad por causas externa en adolescentes y jóvenes, en orden decreciente, son: Colombia, El Salvador, Venezuela, Brasil y Puerto Rico. Los accidentes de tráfico son el determinante principal de la mortalidad por causas externas en la población total como en adolescentes y jóvenes, presentando tendencias decrecientes en casi todos los países estudiados. En 10 países se observa un ascenso progresivo de la mortalidad por homicidio en todos los grupos estudiados (Colombia, Puerto Rico, Trinidad & Tobago, Argentina, Uruguay, Panamá, EEUU, Venezuela, Ecuador y Brasil). Los países con mayores tasa de mortalidad por homicidio entre los varones de 15 a 19 años son, en orden decreciente: Colombia, El Salvador, Puerto Rico, Venezuela y Brasil. Los varones de 20 a 24 años presentan las tasas mas altas de homicidio dentro de los grupos estudiados. Hay un aumento alarmante de la tasa de homicidio en el grupo de varones de 15 a 19 años, especialmente en EEUU y Brasil. La mortalidad por suicidio es un problema creciente entre adolescentes y jóvenes de Cuba, Canadá, EEUU, Trinidad & Tobago, Argentina y El Salvador. Las tasas crecientes de mortalidad por homicidio reflejan la necesidad inminente de programas de vigilancia dirigidos a adolescentes y jóvenes de la Región de las Américas.

O SUS na lógica da descentralização / The SUS in descentralization logic

Aborda a criação do SUS e a municipalização da saúde, idéias que acabaram sendo inscritas na Constituição de 88, com sua posterior regulamentação por meio das leis 8080 e 8142, de 1990. A saúde é um direito de todos e dever do Estado