We use a set of evoked words to define the vertices of a network. The connections between vertices are established by individuals in a population that evoke these words. The resulting graph is called an Evoked Words Network, EWN. The data of evoked words comes from an epidemiological research in odontological public health. In this research we consider three concept themes or evocative words: mouth, disease, and health. We investigate these words in two populations: an upper middle class and a poor district of the city of Natal. We compare and analyze six EWNs. The distribution of connectivities of all of these EWNs indicates a scale-free structure, with the data fitting a power law. The analyzed quantities of the EWNs depend more on the concept theme than on the income of population. This conclusion is discussed in the context of language-based networks.

Sementes de picão-preto (Bidens pilosa L.) foram germinadas em placas de petri sobre papel de filtro molhado com diferentes concentrações de fluometuron (0, 5, 25, 125 e 625 ppm). O ensaio foi conduzido em condições de laboratório, com variação de temperatura entre 24°C e 28°C e intensidade luminosa máxima de 600 lux e foi encerrado após sete dias (168 horas). O fluometuron diminuiu a germinabilidade e o comprimento da radídula e do hipocótilo, afetou o formato dos cotilédones e, nas concentrações mais elevadas, impediu a rejeição do pericarpo. Os efeitos observados não são atribuíveis a lesões bioquímicas do processo fotossintético.

Seeds of Bidens pilosa L. (Compositae) were germinated in Petri dishes on filter paper wetted with aqueous suspensions of fluometuron at different concentrations (0, 5, 25, 125 and 625 ppm). The experiment was conducted during 7 days, under room conditions; the temperature range was 24°C - 28°C and the maximum light intensity was 600 lux. Fluometuron reduced germination percentage, radicle and hypocotyl lenght, affected cotyledon shape and, at the higher concentrations, prevented the pericarp rejection. The observed effects can not be attributed to biochemical lesions of the photosynthetic process.