Showing papers by "Oswaldo Cruz Foundation published in 1978"
TL;DR: Stability of Schistosoma mansoni egg excretion was studied in 23 residents of a rural endemic area in North-east Brazil where the over-all prevalence rate was 87% and the peak geometric mean egg Excretion was 308 eggs/ml (Bell method) in the 10 to 14-year-old age group.
Abstract: Stability of Schistosoma mansoni egg excretion was studied in 23 residents of a rural endemic area in North-east Brazil where the over-all prevalence rate was 87% and the peak geometric mean egg excretion was 308 eggs/ml (Bell method) in the 10 to 14-year-old age group. Stool examinations by the Kato method were performed for three to four consecutive days each month for three consecutive months. Both raw and transformed data showed significant stability of S. mansoni egg excretion from day to day and month to month in this population. A single Kato examination detected 68% of individuals who were excreting more than 400 eggs per gramme. Although S. mansoni egg excretion is stable over time, identifying individuals with high egg excretion in endemic populations requires sensitive quantitative methods.
38 citations
TL;DR: In vivo activity of olivacine does not parallel its in vitro effects suggesting inactivation of the drug by the host, and ultrastructural and metabolic alterations in Trypanosoma cruzi epimastigotes are observed.
13 citations
TL;DR: Foram feitas observacoes no laboratorio e no campo, em Belo Horizonte, MG, Brasil, com a finalidade de se obter informacoes biologicas e ecologicas sobre Pomacea haustrum.
Abstract: Foram feitas observacoes no laboratorio e no campo, em Belo Horizonte, MG, Brasil, com a finalidade de se obter informacoes biologicas e ecologicas sobre Pomacea haustrum (Reeve, 1856), molusco pilideo, competidor-predador de hospedeiros intermediarios de Schistosoma mansoni Sambon 1907.
10 citations
TL;DR: A significant increase in hepatic fumarase specific activity was observed in mice inoculated with Ehrlich ascites fluid after centrifugation of cells (EAF) and Hepatic aconitase was not significantly influenced by EAF.
Abstract: Ehrlich ascites carcinoma induced significant changes in liver fumarase (activation) and aconitase (inhibition). A significant increase in hepatic fumarase specific activity was also observed in mice inoculated with Ehrlich ascites fluid after centrifugation of cells (EAF). Hepatic aconitase was not significantly influenced by EAF.
5 citations
01 Jan 1978
TL;DR: Helminths from sea fishes occuring in Maranhao State coast are recovered and the nematodes represent 3 genera and the cestode specimes are under Pterobothriidae and only larvae were obtained what makes further diagnosis impossible.
Abstract: Some helminths were recovered from Bagre bagre (Linnaeus, 1766), Fowler, 1841, and Macrodon ancylodon (Bloch, 1801) Jordan, Evermann & Clark, 1930. The nematodes represent 3 genera and the cestode specimes are under Pterobothriidae and only larvae were obtainde what makes further diagnosis impossible. This is the firt note on helminths from sea fishes occuring in Maranhao State coast.
4 citations
3 citations
TL;DR: Foi comentada a possibilidade oferecimento de controle biologico de diferentes especies de Biomphalaria atraves de H. duryi - questao sobre a qual vem desenvolvendo investigacoes biologicas e ecologicas.
Abstract: Utilizando dois tipos distintos de alimentos: "Aquariol" (alimento utilizado para alimentar peixes ornamentais) e alface, isolados e associados, na criacao de Helisoma (Seminolina) duryi (Wetherby, 1879) em laboratorio, foi verificado que; 1. Os caramujos alimentados com alface fresca liberaram, em 17 semanas, 826 desovas on 17.707 ovos. 2. Os especimens alimentados com "aquariol" depuseram 534 desovas on 11.361 ovos. 3. O oferecimento dos dois materiais associados resultou no aumento da fertilidade, obtendo-se, assim, 1.355 desovas ou 34.645 ovos. 4. Em termos medios, cada conjunto de quinze exemplares (com 10 a 14 mm de diâmetro) liberou, diariamente, 95,5 - 148,8 e 291,1 ovos/dia, segundo o tipo de alimento consumido: "aquariol", alface fresca, ou ambos associados. O numero de desovas/dia, na mesma ordem enunciada, foi de 4,5 - 6,9 e 11,4, respectivamente. 5, Os exemplares utilizados descendiam de uma cepa supostamente recem introduzida no municipio de Formosa, GO (Brasil)e originaria da Regiao Neartica (EUA). Foi comentada a possibilidade de controle biologico de diferentes especies de Biomphalaria atraves de H. duryi - questao sobre a qual vem desenvolvendo investigacoes biologicas e ecologicas.
2 citations
TL;DR: Experimental investigations of the immunizing and enhancing activities of exoantigens of T. cruzi are presented, showing that these antigens are able to enhance an infection when added to the trypanosome inoculum just before inoculation into rats.
Abstract: Circulating antigens or exoantigens of trypanosomal origin were first demonstrated in the serum of rats infected with Trypanosoma brucei by WEITZ (1960). Subsequently the presence of these types of antigens has been demonstrated in hosts infected with T. vivax by GRAY (1961), with T. Iewisi by D’ALESSANDRO (1972), and with T. cruzi by SIQUEIRA et al. (1966), DZBENSKI (1974) and ARAUJO (1976). The nature and the role of these antigens in the course of the infection are not yet clear. WEITZ (1960) reported that rats can be immunized by repeated injection of exoantigens of T. brucei, and that exoantigens of this trypanosome are able to enhance an infection when added to the trypanosome inoculum just before inoculation into rats (WEITZ, 1963). In this paper we present results of experimental investigations of the immunizing and enhancing activities of exoantigens of T. cruzi.
2 citations
TL;DR: Aquariol, alface fresca, and alface isolados e associados were used by H. duryi (Wetherby, 1879) in a laboratorio at the criacao de Helisoma (Seminolina) in Brazil as mentioned in this paper.
Abstract: Utilizando dois tipos distintos de alimentos: "Aquariol" (alimento utilizado para alimentar peixes ornamentais) e alface, isolados e associados, na criacao de Helisoma (Seminolina) duryi (Wetherby, 1879) em laboratorio, foi verificado que; 1. Os caramujos alimentados com alface fresca liberaram, em 17 semanas, 826 desovas on 17.707 ovos. 2. Os especimens alimentados com "aquariol" depuseram 534 desovas on 11.361 ovos. 3. O oferecimento dos dois materiais associados resultou no aumento da fertilidade, obtendo-se, assim, 1.355 desovas ou 34.645 ovos. 4. Em termos medios, cada conjunto de quinze exemplares (com 10 a 14 mm de diâmetro) liberou, diariamente, 95,5 - 148,8 e 291,1 ovos/dia, segundo o tipo de alimento consumido: "aquariol", alface fresca, ou ambos associados. O numero de desovas/dia, na mesma ordem enunciada, foi de 4,5 - 6,9 e 11,4, respectivamente. 5, Os exemplares utilizados descendiam de uma cepa supostamente recem introduzida no municipio de Formosa, GO (Brasil)e originaria da Regiao Neartica (EUA). Foi comentada a possibilidade de controle biologico de diferentes especies de Biomphalaria atraves de H. duryi - questao sobre a qual vem desenvolvendo investigacoes biologicas e ecologicas.
1 citations
TL;DR: Foram feitas observacoes no laboratorio e no campo, em Belo Horizonte, MG, Brasil, com a finalidade de se obter informacoes biologicas e ecologicas sobre Pomacea haustrum.
Abstract: Foram feitas observacoes no laboratorio e no campo, em Belo Horizonte, MG, Brasil, com a finalidade de se obter informacoes biologicas e ecologicas sobre Pomacea haustrum (Reeve, 1856), molusco pilideo, competidor-predador de hospedeiros intermediarios de Schistosoma mansoni Sambon 1907.
1 citations