Memórias do Instituto Oswaldo Cruz

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List of Papers (Total 515)

Gel-eletroforese no diagnóstico da varíola

The test of gel-electrophoresis applied to the pox virus group showed to be at least thirth times (30X) more sensitive than agar-gel test on the described conditions (Table I). Twelve specimens, which were positives form Smallpox in the conventional tests of egg inoculation and agar-gel difusion test, have been screened in their original dilutions frozen for more than 1 year and...

A refratariedade das aves ao "Trypanosoma (Schizotrypanum) cruzi

It has already been shown that the refractory state of chickens toward "T. (S.) cruzi" appears early at time of hatch. Fifty-four normal newly hatched and inoculated chicks were negative. it has also been verified that this refractory state persists even after hormonal bursectomy (eggs being injected with 2.5 mg of testosterone). Forty-four bursectomized and inoculated newly...

Alguns nematódeos de peixes do Oceano Atlântico - Costa Continental Portuguesa e Costa do Norte da África

Twenty one fishes collected in Continental Portuguese Coast and North African Coast have been examined for helminths. We found seven of them infected with nematodes (33,3%). Their hosts as well as the species recovered and incidences of infection are as follows: six samples of Beryx decadactylus, in one of them we recovered Ascarophis morrhuae (16,6%); three sample of Lethrinus...

Método para coleta de água em Bromeliáceas

The author describes a new technique of collecting water in bromeliads. It consists in the use of a plastic seringe adapted to a small plastic canule, which is tied to a rubber tube. Pictures are given to better understanding.

Uma nova hemogregarina no sangue de Bufo crucifer wied, 1821 do Brasil

The occurrence of hemogregarines in the blood of Brazilian toads that we have examined (Bufo crucifer, B. Marinus and Melanophryniscus moreirae) has displayed very scarce; only one specimen of B. crucifer from Manguinhos (Rio de Janeiro, Guanabara) was infected. The blood forms that we found were intraerythrocytic, averaging 10,8 by 3,6µ; we did not differenciate them as...

Fauna triatominae do Estado da Bahia, Brasil II - o gênero Rhodnius, com estudos sobre a genitália (Hemiptera, reduviidae, Triatominae)

One female specimen of Rhodnius neglectus was collected inthe State of Bahia, Brazil and is considered the only species of the genus so far found in that State. The AA. present data on the biology and morphology of the insect and make a thorough study of the genital apparatus of the species, which will be used for species differentiation in the future papers about the fauna of...

Mutantes letais termossensíveis em Aspergillus nidulans

Temperature sensitive strains (42ºC) of Aspergillus nidulans were obtaines by U.V. irradiation. The mutant alleles had not been located and among 18 thermosensitive mutants theree gave clear evidence that the determinant of thermosensitivity was caused by effects associated with the nucleus and were selected for further studies. Diploids have been synthesised between normal...

Observações hidrobiológicas sobre a poluição do rio Capibaribe-Mirim, Pernambuco, Brasil

Ecological studies on water pollution in the Capibaribe-Mirim river were carried out during a period of 12 months (January to December 1974 covering the dry and wet seasons). Six collecting stations were established, from the upper course of the river, near Macaparana town, to the middle course, near Goiana town. In about 40 collected samples, 96 taxons, including species and...

Quatro especies nuevas de nematodos del sur del Perú y redescripción de Hedruris Orestiae Moniez, 1889

The collection of large numbers of nematodes from amphibians (Telmatobius sp.) and fish Orestias luteus Valenciennes, 1839 Arequipa, Puno, and Titicaca Lake in South Peru has made possible the revision of one species and the description of our new species: Hedruris orestiae Moniez, 1889 is re-described; Hedruris moniezi sp. n., Falcaustra condorcanquii sp. n., Falcaustra...

Imunoglobulinas na fase crônica da doença de Chagas

Since dibergent results were obtained by different authors about immunoglobulins concentration in sera from acute and chronic cases of Chagas disease, the problem was submited to statistical approach in field conditions in the endemic zone of Bambui, state of Minas Gerais, Brazil. Positives cases were considered in all individuals presenting evidences in parasitological...

Effect of interferon on the development of Trypanosoma cruzi in tissue culture "Vero

Results are presented on the effects of interferon on the intracellular stages of T. cruzi in tissue culture "Vero" cells. Interferon was obtained by infecting monolayers of human amniotic cells with inactivated Newcastle disease virus. Interferon has not affected the cell infection by T. cruzi culture infective stages and neither has it prevented the transformation of amastigote...

Prevalência da infecção pelo Toxoplasma gondii em animais domésticos, silvestres e grupamentos humanos da Amazônia

Serological examination for Toxoplasma gondii in human blood samples and in blood samples from ten different species of animals obtained in Manaus, State of Amazonas-Brazil, are compared with results obtained from similar examinations of blood from humans living in other areas of the Amazon basin. The domestic cat (Felis catus) showed the highest levels of antibody for Toxoplasma...

Alterações celulares na glândula pineal de ratas albinas: efeito da estimulação sonora diária

The authors studied the effect of noise (110 dB), delivered by an eletric bell, upon parenchima cells of pineal gland of albino female rats. Several experimental groups were previously formed and stimulated during, 1, 2, 4 and 7 days. In addition another group was formed and stimulated during 7 days plus 10 additional stimulations of about 3 minutes each after the routine...

Pulmonary involvement in Schistosomiasis mansoni

The post-treatment pulmonary alterations were evaluated in patients (Study 1) and in mice (Study 2) infected with Schistosoma mansoni. Study 1: the patients were examined pre and post-treatment (with ora oxamniquine) and the following exams were performed: sputum for eosinophils and chest x-ray. Study 2: four groups of mice (total = 64) were studied; Group I (infected and treated...

The significance of variation in the susceptibility of Schistosoma mansoni to the antischistosomal drug oxamniquine

Clinical and laboratory evidence is reviewed which shows that there is a great deal of variation in the susceptibility of Schistosoma mansoni to oxamniquine. This variation occurs both among endemic regions and within endemic regions in Brazil and Kenya. It is genetically controlled. It is suggested that the parasite possesses a large capacity for developing resistance to the...

Competitive displacement of Biomphalaria glabrata by B. straminea

Data on the interaction between populations of closely related species of Biomphalaria, B. glabrata and B. straminea, are presented in the current paper. Laboratory and field observations and experiments have shown that B. straminea has competitive advantages over B. glabrata.

A review of achievements of the national schistosomiasis control program in middle and upper Egypt areas

In Egypt the "national schistosomiasis control program" was formulated to control transmission by reduction of prevalence and intensity of current infections, and thereby achieve an acceptable level of schistosomiasis disease control. The program was implemented foremost in Middle Egypt (1977) and Upper Egypt (1980), collectively extending 800 km alongside of the River Nile and...

Granulomatous hypersensitivity to Schistosoma mansoni egg antigens in human Schistosomiasis: I. Granuloma formation and modulation around polyacrylamide antigen-conjugated beads

We have developed an in vitro model of granuloma formation for the purpose of studying the immunological components of delayed type hypersensitivity granuloma formation in patients infected with Schistosoma mansoni. Our data show that 1) granulomatous hypersensitivity can be studied by examining the cellular reactivity manifested as multiple cell layers surrounding the antigen...

Gene amplification in Rhynchosciara (1955-1987)

A review is made of the evidence indicating the existence of gene amplification in Rhynchosciara, from the early cytological work to the more recent studies using cloned sequences from the DNA puffs. Mention is made of work still in progress which indicates that the transcription unit of a DNA puff is surprisingly complex.