Incompatibility Between Miracidia of Schistosoma mansoni and Helisoma duryi Occurs at Two Stages: Penetration and Intramolluscan Establishment

2011 ◽  
Vol 97 (4) ◽  
pp. 743-745 ◽  
Author(s):  
John T. Sullivan ◽  
John T. Yeung
Keyword(s):  
Schistosoma Mansoni ◽  
Helisoma Duryi ◽  
Two Stages

scholarly journals A survey of planorbid molluscs in the Amazonian region of Brazil

1983 ◽  
Vol 78 (3) ◽  
pp. 343-361 ◽  
Author(s):  
W. Lobato Paraense
Keyword(s):  
Schistosoma Mansoni ◽  
Experimental Infection ◽  
Mato Grosso ◽  
Schistosomiasis Mansoni ◽  
Biomphalaria Straminea ◽  
Helisoma Duryi ◽  
Distrito Federal ◽  
In Parenthesis ◽  
Amazonian Region ◽  
Mato Grosso Do Sul

A survey of the plarnorbid fauna in the Brazilian states of the Amazonian river basin revealed the occurence of 14 species, 8 of the genus Biomphalaria, 4 of Drepanotrema, 1 of Antillorbis and 1 of Plesiophysa, besides a naturalized puopulation of Helisoma duryi at Santa Rosa, municipality of Formosa, state of Goiás. The following is the distribution of the species by genera, in decreasing order of frequency (number of localities in parenthesis): 1. Biomphalaria straminea (50): Acre, Amazonas, Distrito Federal, Goiás, Maranhão, Mato Grosso, Mato Grosso do Sul, Pará and Roraima; 2. B. occidentalis (30): Acre, Amazonas, Mato Grosso and Mato Grosso do Sul; 3. B. schrammi (22); Distrito Federal, Goiás, Maranhão, Mato Grosso, Mato Grosso do Sul and Pará; 4. B. amazonica (14): Acre, Amazonas and Rondônia; 5. B. glabrata (13): Distrito Federal, Goiás, Maranhão and Pará; 6. B. peregrina (4): Distrito Federal, Goiás and Mato Grosso do Sul; 7. B. tenagophila (2): Distrito Federal and Goiás; 8. B. oligoza (2): Mato Grosso do Sul; 9. Drepanotrema lucidium (72): Acre, Amapá, Amazonas, Distrito Federal, Goiás, Maranhão, Mato Grosso, Mato Grosso do Sul, Pará, Rondônia and Roraima; 10. D. anatinum (41): Acre, Amazonas, Distrito Federal, Goiás, Maranhão, Mato Grosso do Sul, Pará, Rondônia and Roraima; 11. D. depressissimum (19): Acre, Amazonas, Distrito Federal, Goiás, Maranhão, Mato Grosso, Mato Grosso do Sul and Pará; 12. D. cimex (15): Acre, Amazonas, Distrito Federal, Goiás, Mato Grosso, Mato Grosso do Sul and Pará; 13. Antillorbis nordestensis (3): Distrito Federal, Maranhão and Pará; 14. Plesiophysa ornata (1): Goiás. B. glabrata is responsibel for transmission of schistosomiasis mansoni in northeastern Pará, northern Marnhão and central Goiás including the Distrito Fedreal. B. tenagophila, although susceptible to experimental infection with Schistosoma mansoni, has not been found naturally infected so far in the area. B. straminea has been incriminated as...

scholarly journals Esquistossomose Urbana no Norte Pioneiro do Estado do Paraná, Brasil

2018 ◽  
Vol 19 (4) ◽  
pp. 251 ◽  
Author(s):  
Aline Balandis Costa ◽  
Daiane Suele Bravo ◽  
Tatiane Silva Guilherme ◽  
Reinaldo Marqui ◽  
Flávia Teixeira Ribeiro da Silva ◽  
...  
Keyword(s):  
Public Health ◽  
Schistosoma Mansoni ◽  
Economic Consequences ◽  
Parasitic Diseases ◽  
Risk Of Infection ◽  
Southern States ◽  
The Status ◽  
High Level ◽  
Two Stages ◽  
The City

A esquistossomose é uma das principais doenças parasitárias do mundo devido a sua prevalência e consequências econômicas na saúde pública nos locais onde ocorre. As estimativas apontam que 779 milhões de pessoas estão sob risco de infecção e 243 milhões de pessoas necessitaram de tratamento em 2011. No Brasil, a esquistossomose tem sido notificada em Estados do Nordeste, Sudeste e Sul, acometendo aproximadamente seis milhões de indivíduos. No Estado do Paraná se verifica a disseminação de moluscos da família Planorbidae em 102 municípios. O objetivo foi verificar a situação de transmissão da esquistossomose em área urbana do município de Bandeirantes, Paraná. Tratase de um estudo de caráter epidemiológico descritivo, de corte transversal, realizado em duas etapas. Na primeira etapa foi feito um estudo retrospectivo dos casos da doença e, na segunda, foi feita a aplicação de questionário sobre o comportamento das pessoas e das condições sanitárias e ambientais da Vila São Pedro. Nesta etapa, as fezes de 301 habitantes desta vila foram coletadas e examinadas pelo método de Kato-Katz. Constatou-se somente nove (2,99%) indivíduos infectados por Schistosoma mansoni, dos quais dois foram classificados com o grau moderado/alto de infecção. Os resultados mostram que houve redução de casos de esquistossomose no município de Bandeirantes.Palavras-chave: Schistosoma mansoni. Epidemiologia. Saúde Pública.AbstractSchistosomiasis is one of the world’s major parasitic diseases due to its prevalence and economic consequences in public health where it occurs. Estimates indicate that 779 million people are at risk of infection and 243 million people needed treatment in 2011. In Brazil, schistosomiasis has been reported in northeastern, southeastern and southern states, affecting approximately six million individuals. In the state of Paraná the dissemination of mollusks of the Planorbidae family is found in 102 municipalities. The objective was to verify the status of transmission of schistosomiasis in an urban area of the city of Bandeirantes, Paraná. It is a descriptive epidemiological study ofcross-sectional character, carried out in two stages. In the first stage a retrospective study was done of cases of the disease and in the second a questionnaire was done on the individuals’ behavior, sanitary and environmental conditions of Vila São Pedro. At this stage the feces of 301 inhabitants of this village were collected and examined by the Kato-Katz. It was found only nine (2.99%) individuals infected with Schistosoma mansoni, of which two were classified as moderate / high level of infection. The results showed a significant reduction of schistosomiasis cases in the city of Bandeirantes.Keywords: Infection. Schistosoma mansoni. Epidemiology. Public Health.

scholarly journals Ação inibidora de termofosfato magnesiano sobre a fecundidade de planorbídeos e seu possível significado no controle da esquistossomose mansoni

1981 ◽  
Vol 15 (1) ◽  
pp. 59-71 ◽  
Author(s):  
Roberto Milward-de-Andrade ◽  
Leonardo Fittipaldi Torga
Keyword(s):  
Schistosoma Mansoni ◽  
Fasciola Hepatica ◽  
Helisoma Duryi

A eficácia de termofosfato magnesiano (fertilizante e corretivo do solo) na alimentação de planorbídeos, em laboratório, foi testada ao longo de cinco semanas, verificando-se o crescimento da concha de populações experimentais de Bimphalaria glabrata (Say, 1818) e Helisoma duryi (Wetherby, 1879). Reversamente observou-se que aquele produto mineral bloqueou a oviposição de ambas as espécies, a partir da segunda semana do experimento, quando proporcionado, isoladamente ou associado, a latoso ou a folhas de alface. Em conseqüência, supõe-se que sua ampla utilização nas novas áreas de cultivo, obtidas através de métodos modernos de irrigação, poderá, adicionalmente - ao ser carreado pelas chuvas, para ecossistemas lênticos ou lóticos - reduzir as populações pioneiras de diferentes espécies de Bimphalaria constituindo-se útil meio de controle da esquistossomose mansoni, em zonas rurais. Ademais, poderá ser eficaz no controle dos hospedeiros intermediários de Schistosoma mansoni que, usualmente, se estabelecem em lagoas de criação de peixes - cuja multiplicação, em áreas tropicais, vem sendo incentivada, quer como atividade econômica alternativa para o pequeno proprietário rural quer como exigência de necessidade nutricional das comunidades humanas mais pobres. Supõe-se, ainda, que o material testado poderá controlar populações de limneídeos, hospedeiros intermediários de Fasciola hepatica. São sugeridos testes de campo que possam efetivamente comprovar a hipótese levantada, e também estudos destinados ao conhecimento do mecanismo de ação do elemento magnésio no bloqueio da fertilidade de moluscos. Salienta-se a necessidade de pesquisas especiais sobre o efeito de diferentes concentrações de magnésio em ovos e formas juvenís de planorbídeos, bem como sobre miracídios e cercárias (intra-caramujos e livre-natantes) de trematódeos.

scholarly journals REPRODUCTION MECHANISM OF MOTHER SPOROCYSTS SCHISTOSOMA MANSONI

2020 ◽  
Author(s):  
G.L. Ataev ◽  
◽  
A.S. Tokmakova ◽  
Keyword(s):  
Schistosoma Mansoni ◽  
Body Area ◽  
Electron Microscopic ◽  
Undifferentiated Cells ◽  
Two Stages ◽  
Germinal Cells ◽  
Microscopic Investigations

histological and electron microscopic investigations were performed of the development of generative elements of Schistosoma mansoni mother sporocysts (MS). On average 20 germinal cells (GC) are found in miracidium. After metamorphosis of miracidium into sporocysts GC grow and on the 3d day start to divide thus forming first embryos of daughter sporocysts. During the same time germinal masses start to form in the subtegumental body area of MS. At this point proliferation of undifferentiated cells (UC) occurs only in the germinal masses. Here also a part of UC differentiates into GC. These cells form sporocystoid embryos. Therefore, the formation of generative elements into S. mansoni MS occurs in two stages. The primaries GC are formed in the process of the miracidium development into the egg, but secondary GC forming into germinal masses of MS.

Altered Fine Structure of B Lymphocytes Correlated with Defective Terminal Differentiation

1973 ◽  
Vol 31 ◽  
pp. 386-387
Author(s):  
Dale E. Bockman ◽  
L. Y. Frank Wu ◽  
Alexander R. Lawton ◽  
Max D. Cooper
Keyword(s):  
Immune Deficiency ◽  
B Lymphocytes ◽  
Plasma Cells ◽  
Present Report ◽  
Specific Antigen ◽  
Terminal Differentiation ◽  
Second Stage ◽  
Two Stages ◽  
Deficiency Diseases ◽  
Cell Line Generation

B-lymphocytes normally synthesize small amounts of immunoglobulin, some of which is incorporated into the cell membrane where it serves as receptor of antigen. These cells, on contact with specific antigen, proliferate and differentiate to plasma cells which synthesize and secrete large quantities of immunoglobulin. The two stages of differentiation of this cell line (generation of B-lymphocytes and antigen-driven maturation to plasma cells) are clearly separable during ontogeny and in some immune deficiency diseases. The present report describes morphologic aberrations of B-lymphocytes in two diseases in which second stage differentiation is defective.

Formation of Dislocation Channels in Neutron Irradiated Molybdenum

1972 ◽  
Vol 30 ◽  
pp. 672-673
Author(s):  
S. Mahajan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ambient Temperature ◽  
Room Temperature ◽  
Channel Formation ◽  
Early Stages ◽  
Transmission Electron ◽  
Three Stages ◽  
Two Stages ◽  
Polycrystalline Molybdenum

The evolution of dislocation channels in irradiated metals during deformation can be envisaged to occur in three stages: (i) formation of embryonic cluster free regions, (ii) growth of these regions into microscopically observable channels and (iii) termination of their growth due to the accumulation of dislocation damage. The first two stages are particularly intriguing, and we have attempted to follow the early stages of channel formation in polycrystalline molybdenum, irradiated to 5×1019 n. cm−2 (E > 1 Mev) at the reactor ambient temperature (∼ 60°C), using transmission electron microscopy. The irradiated samples were strained, at room temperature, up to the macroscopic yield point.Figure 1 illustrates the early stages of channel formation. The observations suggest that the cluster free regions, such as A, B and C, form in isolated packets, which could subsequently link-up to evolve a channel.

Ultrastructural analysis of “Sensory” surface nerve endings and “putative” neurotransmitter sites in Schistosoma mansoni Miracidia

1989 ◽  
Vol 47 ◽  
pp. 962-963
Author(s):  
Betty Ruth Jones ◽  
Steve Chi-Tang Pan
Keyword(s):  
Nervous System ◽  
Life Cycle ◽  
Schistosoma Mansoni ◽  
Snail Host ◽  
Complex Life Cycle ◽  
Rational Approach ◽  
Effective Control ◽  
The Social ◽  
Social And Economic Development ◽  
Basic Biology

INTRODUCTION: Schistosomiasis has been described as “one of the most devastating diseases of mankind, second only to malaria in its deleterious effects on the social and economic development of populations in many warm areas of the world.” The disease is worldwide and is probably spreading faster and becoming more intense than the overall research efforts designed to provide the basis for countering it. Moreover, there are indications that the development of water resources and the demands for increasing cultivation and food in developing countries may prevent adequate control of the disease and thus the number of infections are increasing.Our knowledge of the basic biology of the parasites causing the disease is far from adequate. Such knowledge is essential if we are to develop a rational approach to the effective control of human schistosomiasis. The miracidium is the first infective stage in the complex life cycle of schistosomes. The future of the entire life cycle depends on the capacity and ability of this organism to locate and enter a suitable snail host for further development, Little is known about the nervous system of the miracidium of Schistosoma mansoni and of other trematodes. Studies indicate that miracidia contain a well developed and complex nervous system that may aid the larvae in locating and entering a susceptible snail host (Wilson, 1970; Brooker, 1972; Chernin, 1974; Pan, 1980; Mehlhorn, 1988; and Jones, 1987-1988).

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