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Search Results: 1 - 10 of 366 matches for " Nematodes "
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Plant parasitic nematodes associated with banana crop in Crete, Greece
Emmanuel A. Tzortzakakis
Acta agriculturae Slovenica , 2008, DOI: 10.2478/v10014-008-0010-9
Abstract: This is a report on the presence of Meloidogyne spp., Helicotylenchus multicintus and Pratylenchus goodeyi in roots of banana crops in Crete.
Nematode Infections Are Risk Factors for Staphylococcal Infection in Children
Moreira-Silva, Sandra F;Leite, Alba LA;Brito, Eliana F;Pereira, Fausto EL;
Memórias do Instituto Oswaldo Cruz , 2002, DOI: 10.1590/S0074-02762002000300021
Abstract: nematode infection may be a risk factor for pyogenic liver abscess in children and we hypothesized that the immunomodulation induced by those parasites would be a risk factor for any staphylococcal infection in children. the present study was designed to compare, within the same hospital, the frequency of intestinal nematodes and toxocara infection in children with and without staphylococcal infections. from october 1997 to february 1998, 80 children with staphylococcal infection and 110 children with other diseases were submitted to fecal examination, serology for toxocara sp., evaluation of plasma immunoglobulin levels, and eosinophil counts. mean age, gender distribution, birthplace, and socioeconomic conditions did not differ significantly between the two groups. frequency of intestinal nematodes and positive serology for toxocara, were remarkably higher in children with staphylococcal infections than in the non-staphylococcal group. there was a significant correlation between intestinal nematodes or toxocara infection and staphylococcal infection in children, reinforced by higher eosinophil counts and higher ige levels in these children than in the control group. one possible explanation for this association would be the enhancement of bacterial infection by the immunomodulation induced by helminth infections, due to strong activation of the th2 subset of lymphocytes by antigens from larvae and adult worms.
Nematode parasites of Brazilian psittacid birds, with emphasis on the genus Pelecitus railliet & Henry, 1910
Pinto, Roberto Magalh?es Pinto;Vicente, J. Julio;Noronha, Dely;
Memórias do Instituto Oswaldo Cruz , 1993, DOI: 10.1590/S0074-02761993000200016
Abstract: in the present paper, some species of nematodes from brazilian parrots are studied: aproctapyrrhurae. ascaridia hermaphrodita, a. sergiomeirai, pelecitus circularis and p. helicinus. single female specimens of pelecitus sp. and thelazia sp. are presented. the male of p. circularis is fully illustrated, for the first time, since 1884. ascaridia sergiomeirai is also restudied 59 years after proposition. new host records are estabilished. remarks on other species of nematodes occuring in psittacid birds are included.
Helmintos parasitos de peixes das usinas hidreléticas da Eletrosul (Brasil). II: Reservatórios de Salto Osório e de Salto Santiago, Bacia do Rio Igua?u
Kohn, Anna;Fernandes, Berenice M. M.;Pipolo, Harlan V.;Godoy, Manuel P. de;
Memórias do Instituto Oswaldo Cruz , 1988, DOI: 10.1590/S0074-02761988000300006
Abstract: eight species of nematodes and one larval cestode were recovered from 88 specimens of 12 species of fishes captured in the reservoir of "salto osório". capillaria sp., contracoecum sp., (larval forms), procamallanus peraccuratus pinto et al., 1976, procamallanus petterae kohn & fernandes, 1988, raphidascaris sp., spirocamallanus intermedius pinto et al., 1974 and spirocamallanus pintoi kohn & fernandes, 1988. from 83 specimens of 12 species of fishes from the reservoir of "salto santiago", only one species of cestode and three species of nematodes were recovered: contracoecum sp. (larval forms), procamallanus peraccuratus and raphidascaris sp. pimelodus ortmanni is a new host record for p. peraccurants and s. intermedius.
Estudio epidemiológico de larvas de nemátodos gastrointestinales en praderas pastoreadas por alpacas (Lama pacos) en Valdivia, Chile
Valenzuela,G.; Leiva,M.P.; Quintana,I.;
Archivos de medicina veterinaria , 1998, DOI: 10.4067/S0301-732X1998000200008
Abstract: in order to study the epidemiology of trichostrongylid parasites in alpacas (lama pacos), a study was undertaken in valdivia, chile, xth region (39° 48? s, 73° 14? w) based on faecal and grass examinations, during a period of fifteen months, starting in january 1995. animal were grouped according to the age as follows: group a, 4 animals up to one year old; group b, 11 animals between 1 to 2 years old and 32 animals more than 2 years old. the most frequent genus or species of infective larvae identified were: nematodirus spathiger, ostertagia, trichostrongylus, nematodirus filicollis and cooperia. during the 1995 summer, a low number of infective larvae were observed as a consequence of the low contamination of the grass during the previous year, and to the dry period in the summer months. in autumn, larvae increased reaching a peak in april with 447 larvae per kg dry matter. the greatest contribution was given by n. spathiger. the other species were less frequently identified. strongylid type eggs, nematodirus, trichuris sp. and capillaria sp. were observed, few eggs were seen during the observation period. related with strongylid type eggs, more eggs were seen in group a. related with nematodirus eggs, few eggs were seen in group b and c. more eggs were seen in group a. trichuris sp. and capillaria sp. eggs were less frequently observed. it can be concluded that: weather conditions influence the number of infective larvae on the grass. strongylid egg number are low as a consequence of the deposition of faeces in particular sites
Fenóis, peroxidase e polifenoloxidase na resistência do cafeeiro a Meloidogyne incognita
Mazzafera, Paulo;Gon?alves, Wallace;Fernandes, José Afonso Righetti;
Bragantia , 1989, DOI: 10.1590/S0006-87051989000200001
Abstract: seedlings of two coffee cultivars were inoculated with the nematode meloidogyne incognita: cv. mundo novo (susceptible) of coffea arabica and cv. apoat? (resistant) of c. canephora. during the larval penetration and adult female phases of the parasite, evaluations were made on phenol content, peroxidase and polyphenoloxidase activities. in the two evaluations, no differences were observed in roots and shoots growth among inoculated and non inoculated seedling. for both cultivars, only in the first phase infected seedlings showed an increase in phenols as compared to their counterparts not inoculated. however, phenol values were higher in the second than in the first phase. the cv. mundo novo had always higher phenols content than apoat?. only inoculated seedlings of the cv. mundo novo showed an increase of peroxidase activities in the first phase; but, both cultivars presented higher peroxidase activities in the second phase as compared to the first. apoat? seedlings had always higher peroxidase and polyphenoloxidase activities than mundo novo. infected seedlings of the cv. apoat? showed in the first phase, only, an increase in polyphenoloxidase activity. thin-layer chromatograms of phenolic extracts did not present any difference among inoculated and non-inoculated seedlings. twenty three spots on the chromatograms were common to both cultivars, except that apoat? had a further nine spots not found in mundo novo and the later had a further eleven not found in the former.
Larval nematodes found in amphibians from northeastern Argentina
González, CE.;Hamann, MI.;
Brazilian Journal of Biology , 2010, DOI: 10.1590/S1519-69842010000500026
Abstract: five species of amphibians, leptodactylus podicipinus, scinax acuminatus, s. nasicus, rhinella fernandezae and pseudis paradoxa, were collected in corrientes province, argentina and searched for larval nematodes. all larval nematodes were found as cysts in the serous of the stomach of hosts. were identified one superfamily, seuratoidea; one genus, spiroxys (superfamily gnathostomatoidea) and one family, rhabdochonidae (superfamily thelazioidea). we present a description and illustrations of these taxa. these nematodes have an indirect life cycle and amphibians are infected by consuming invertebrate, the intermediate hosts. the genus spiroxys and superfamily seuratoidea were reported for the first time for argentinean amphibians.
Atra??o e penetra??o de Meloidogyne javanica e Heterodera glycines em raízes excisadas de soja
Campos, Hercules Diniz;Campos, Vicente Paulo;Silva, Juliana Resende Campos;Silva, Luiz Henrique Carregal Pereira da;Costa, Lilian Simara Abreu Soares;Terra, Willian César;
Ciência Rural , 2011, DOI: 10.1590/S0103-84782011000900002
Abstract: to study the attraction and penetration of meloidogyne javanica (treub) chitwood and heterodera glycines (ichinoe) in soybean (glycine max l.), a technique using 2-cm long root segments was developed. in infected soybean root segments penetration of second stage juveniles (j2) of m. javanica occured through the root cap following migration between the vascular bundles of the central cylinder. juveniles of h. glycines penetrated about 15mm from the root cap. the cut region of the soybean root attracted three times more j2 of m. javanica when compared to the root cap, but was not as attractive to h. glycines j2. sealing both root cap and cut region reduced (83%) the j2 penetration of m. javanica and h. glycines. when only one of these penetration sites was sealed the open site compensated attractiveness. these results show that the attractive substances are released by these two penetration sites. the m. javanica j2 penetration was higher in root segments when compared to whole soybean plants. however, h. glycines j2 penetrated less in root segments and in roots of seedlings without leaves when compared to roots of whole soybean plants and roots of plants without the aerial part. in short, attraction and infection sites of h. glycines and m. javanica j2s in soybean cultivar "embrapa 20" are different and this technique may be useful in studies of attraction and penetration of other endoparasitic nematodes.
Helminth fauna of bovines from the Central-Western region, Minas Gerais State, Brazil
Santos, Thaís Rabelo dos;Lopes, Welber Daniel Zanetti;Buzulini, Carolina;Borges, Fernando de Almeida;Sakamoto, Cláudio Alessandro Massamitsu;Lima, Roberto Cesar de Araújo;Oliveira, Gilson Pereira de;Costa, Alvimar Jose da;
Ciência Rural , 2010, DOI: 10.1590/S0103-84782010005000040
Abstract: seventy-six naturally infected bovines, males and females of mixed breed, aged 8 to 12 months-old, were necropsied. the results of necropsy revealed the presence of 9 helminth genera and 16 species, with the following prevalence and mean infection intensity: haemonchus placei (100.0%; 3895.5); haemonchus similis (29.0%; 159.6); cooperia punctata (100.0%; 5595.0); cooperia spatulata (32.9%; 137.8); cooperia pectinata (34.2%; 1010.5); trichostrongylus axei (69.7%; 239.2); trichostrongylus colubriformis (10.5%; 10.8); trichostrongylus longyspicularis (2.6%; 0.5); ostertagia ostertagi (2.6%; 3.1); ostertagia lyrata (2.6%; 1.5); ostertagia trifurcata (1.3%; 0.3); oesophagostomum radiatum (94.7%; 470.9); trichuris discolor (47.4%; 32.5); strongyloides papillosus (1.3%; 0.1); capillaria bovis (9.2%; 1.0) and bunostomum phlebotomum (2.6%; 0.3). the mean parasitic load was 11,558.5 helminths per bovine. of the 76 necropsied bovine, 92.1% were infected by 3 to 7 helminth species. only 7.9% of hosts were parasitized by 8 different helminth species. this study includes the first report of the species ostertagia lyrata and ostertagia trifurcata in minas gerais state. it should be emphasized that while identifying the helminths collected during necropsy in the present work, observation revealed that an inversion in the mean parasitic intensity is occurring, showing diminishing numbers of cooperia and an increase in haemonchus compared to the values reported in the literature.
Xiphinema americanum Cobb, 1913 (Dorylaimida: Longidoridae): espécie-praga quarentenária para o Brasil
Brito, Giovani Greigh de;Costa, Ervandil Corrêa;Antoniolli, Zaida Inês;D?rr, Felipe;Maziero, Heleno;
Ciência Rural , 2005, DOI: 10.1590/S0103-84782005000100041
Abstract: different aspects concerning the quarantine pest x. americanum, including taxonomic characteristics, world distribution, host plants, viruses transmission potential, control methods and others, were reviewed. the difficulty in correctly identifying this nematode usually results in its misleading into another species belonging to the same genus. considering that this pest has almost a worldwide distribution and that it is a virus?s vector, knowledge about it is important to avoid its introduction in new areas, like brazil.
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