Efeito alelopático e análise dos rótulos de garrafadas comercializadas no Mercado Municipal de Montes Claros – MG / Allelopathic effect and analysis of bottle labels commercialized in the municipal market of Montes Claros – MG

RESUMO O presente estudo teve como objetivo analisar o efeito alelopático e o rótulo dos produtos vegetais contidos nas garrafadas comercializadas no mercado municipal de Montes Claros - MG. Adquiriram-se oito garrafadas que foram utilizadas para tratar, cada uma, 20 sementes de alface (Lactuca sativa L.) dispostas em placas de Petri sobre papel saturado com 4mL do conteúdo de cada garrafada em 04 concentrações: 12,5; 25; 50; e 75%. O controle positivo foi realizado com solução de sulfato de zinco a 1%, além dos controles: água mineral, água da torneira, e água destilada. As placas de Petri foram lacradas com filme plástico, cobertas com saco plástico e incubadas em escuro por sete dias à temperatura média de 27,2°C e na umidade média de 54%. Após 7 dias, mediu-se o comprimento da radícula e do hipocótilo (mm) de cada uma das plântulas e quantificou-se o número de sementes que germinaram. Os dados foram submetidos à análise de variância pelo software Sisvar, sendo os resultados comparados pelo Teste Scott-Knott ao nível nominal de 5%. Os resultados do teste de germinação indicaram que houve efeito significativo das garrafadas sobre a germinação das sementes de Lactuca sativa L., onde o percentual de germinação das sementes foi inversamente proporcional ao aumento da concentração das garrafadas. Portanto, observou-se que as garrafadas apresentaram potencial alelopático ao inibirem a germinação das sementes de alface.

ABSTRACT This study aimed to analyze the allelopathic effect and label of plant products put in bottles commercialized in the municipal market of Montes Claros - MG. Eight bottles were employed to treat, each one, 20 lettuce seeds (Lactuca sativa L.) placed at Petri plaques over saturated paper with 4mL of the content of each bottle in 04 concentrations of 12.5; 25; 50; 75% for each bottle, 1% of zinc sulfate solution (positive control) and 3 negative control groups (containing mineral water, tap water and distilled water). The Petri plaques were sealed with plastic film, covered with plastic bag and incubated in the dark for seven days at an average temperature of 27.2°C and average humidity of 54%. After 7 days, it was measured the length of the radicle and the hypocotyl (mm) of each one of the seedlings and the number of seeds that germinated was quantified. The data were submitted to analysis of variance by Sisvar software and the results were compared by Scot-Knott Test at a nominal level of 5%. The results of the germination test indicated that there was a significant impact of the bottles in the germination of the lactuca sativa L. seeds, where the percentage of seeds germination was inversely proportional to the concentration increase in the analyzed bottles. Therefore, it has been observed that the bottles presented allelopathic potential when they inhibited the germination of lettuce seeds.

Halophytes as sources of metals in estuarine systems with low levels of contamination.

Heavy metal concentrations present in the above- and beowground tissues of Scirpus maritimus L., Spartina maritima (Curtis) Fernald and Zostera noltii Hornem were analysed seasonally in the Mondego Estuary, Portugal. The sediments of the estuary were confirmed to contain only low concentrations of heavy metals. The belowground tissues of all three species showed higher heavy metal concentrations than the aboveground tissues. Although the sediments only contained low levels of contamination, because the area occupied by S. maritimus and Z. noltii was large, significant quantities of heavy metals were accumulated and exported to the surrounding water bodies. In contrast with observations of highly contaminated estuaries, it was found that in spite of the low level of contaminants in the sediments of the Mondego Estuary, aquatic vegetation functioned as a source of metals for nearby systems.

[Neurologic and laboratory findings in a population of an endemic area for taeniasis-cysticercosis, Lagamar, MG, Brazil (1992-1993)]. / Achados neurológicos e laboratoriais em população de área endêmica para teníase-cisticercose, Lagamar, MG, Brasil (1992-1993).

A clinic-epidemiological enquiry was conducted on in an endemic area for teniasis-cysticercosis. From the whole population 1080 (32.2%) individuals were examined. We found 198 (18.3%) individuals referring teniasis-bearing in the past, and 103 (9.5%) affirming to have had convulsions, either in the past or present. From the last group, 39 (37.8%) indicated that the crisis had begun in adulthood. From the group of patients presenting convulsions, 62 (62%) had laboratory tests performed. Computed tomography showed intracranial calcifications in 21 (33.8%) patients, variable in number and location, suggesting neurocysticercosis and no evidence of disease activity. Electroencephalograms showed abnormal waves in 21 (33.8%) patients and cerebrospinal fluid analyses were altered in 27 (43.5%) cases, having detected eosinophils only in 3 (4.8%) patients. Spinal fluid tests for cysticercosis through enzyme linked immunosorbent assay (ELISA) or indirect immunofluorescence were taken in only 26 (41.9%) patients, obtaining positive results in 6 (23%) samples. Varying upward shifts of protein levels were found in spinal fluid analysis. Assuming that all epidemiologic risk factors for teniasis-cysticercosis in the studied region and its correlation with the laboratory alterations described in convulsing crisis, a prevalence of 1.9% for neurocysticercosis was found.