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Acta tropica 32건

  1. [해외논문]   A novel window entry/exit trap for the study of endophilic behavior of mosquitoes   SCI SCIE

    Mü (Department of Microbiology and Molecular Genetics, IMRIC, Kuvin Centre for the Study of Infectious and Tropical Diseases, Faculty of Medicine, Hebrew University, Jerusalem, 91120, Israel ) , ller, Gü (Department of Microbiology and Molecular Genetics, IMRIC, Kuvin Centre for the Study of Infectious and Tropical Diseases, Faculty of Medicine, Hebrew University, Jerusalem, 91120, Israel ) , nter C. (Malaria Research and Training Center, Faculty of Medicine, Pharmacy and Odontostomatology, University of Bamako, BP 1805, Bamako, Mali ) , Junnila, Amy (Department of Anatomy and Cell Biology, Bruce Rappaport Faculty of Medicine, Technion, Haifa 34995, Israel ) , Traore, Mohamed M. (Malaria Research and Training Center, Faculty of Medicine, Pharmacy and Odontostomatology, University of Bamako, BP 1805, Bamako, Mali ) , Revay, Edita E. (Malaria Research and Training Center, Faculty of Medicine, Pharmacy and Odontostomatology, University of Bamako, BP 1805, Bamako, Mali ) , Traore, Sekou F. (Department of Microbiology and Molecular Genetics, IMRIC, Kuvin Centre for the Study of Infectious and) , Doumbia, Seydou , Schlein, Yosef , Kravchenko, Vasiliy D. , Xue, Rui-De , Tsabari, Onie , Beier, John C.
    Acta tropica v.167 ,pp. 137 - 141 , 2017 , 0001-706x ,

    초록

    Abstract To overcome the limitations of currently used window entry/exit traps, we developed an efficient new glue net entry/exit trap (GNT) that is economical, easily transported and assembled, and can be utilized for a variety of studies which aim to investigate the dynamics of mosquito movements between indoor and outdoor habitats. Cage experiments were conducted to determine what percentage of mosquitoes trying to pass through the netting are actually being caught. The GNT caught 97% of female and 98% of male Anopheles gambiae s.s., as well as 97.5% of female and 98% of male Culex pipiens attempting to cross into a bait chamber adjoining the release cage. During a six day field study, the bedroom windows of 12 homes in Mali were fitted with entry/exit GNTs. Traps without glue were fitted over the inside and outside bedroom windows of an additional 12 homes as a control. A total of 446 An. gambiae s.l. were caught attempting to exit dwellings while 773 An. gambiae s.l. were caught attempting to enter. The number of males and females attempting to exit dwellings were roughly similar (215 and 231 respectively) while there was a slight difference in the number of males and females trying to enter (382 and 430 respectively). Pyrethrum spray catches (PSC’s) conducted inside the dwellings on the last day of the experiment yielded only six females and a single male. Highlights We developed a new mosquito entry/exit trap that is economical, easily transported and assembled. Traps consisted of glue-painted green plastic netting held in place by plywood frames. Traps caught >95% of mosquitoes in laboratory testing using Culex pipiens and Anopheles gambiae . In field trials in Mali, traps were highly effective at trapping entering and exiting An. gambiae s.l. Mosquitoes are trapped live and can be used for further biochemical, molecular or viral analyses. Graphical abstract A new glue net trap, for catching mosquitoes attempting to enter and exit human homes, was developed and field tested in Mali. An. gambiae s.l. caught on a glue net trap. [DISPLAY OMISSION]

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  2. [해외논문]   Development of an experimental model of schistosomal myeloradiculopathy   SCI SCIE

    de Carvalho, Tiago Pinheiro Vaz (Centro de Pesquisas Aggeu Magalhães −) , Ferrari, Teresa Cristina Abreu (FIOCRUZ, Recife, Pernambuco, Brazil ) , de Santana, Josimari Melo (Universidade Federal de Minas Gerais −) , Viana, Victor Antô (UFMG, Belo Horizonte, Minas Gerais, Brazil ) , nio Santos (Universidade Federal de Sergipe −) , Santos, José (UFS, São Cristóvão, Sergipe, Brazil ) , Aislan Correia (Universidade Federal de Sergipe −) , do Nascimento, Wheverton Correia (UFS, São Cristóvão, Sergipe, Brazil ) , da Cruz, Kamilla Mayara Lucas (Universidade Federal de Sergipe −) , de Araú (UFS, São Cristóvão, Sergipe, Brazil ) , jo, Karina Conceiç (Centro de Pesquisas Aggeu Magalhães −) , ã (FIOCRUZ, Recife, Pernambuco, Brazil ) , o Gomes Machado (Universidade Federal de Sergipe −)
    Acta tropica v.167 ,pp. 142 - 147 , 2017 , 0001-706x ,

    초록

    Abstract Schistosomal myeloradiculopathy (SMR) is a severe form of presentation of schistosomiasis in which Schistosoma spp. affect the spinal cord. The aims of the present study were to develop an animal model of SMR caused by S. mansoni, to characterize both sensory and motor abnormalities in the infected animals, and to investigate the relationship of the sensory, motor and histological findings with the progression of the infection over time. Mechanical sensitivity and behavioral tests were performed followed by euthanasia in male Wistar rats divided into six groups of five animals each, on days 5, 10, 20 and 30 after infection of S. mansoni eggs. The controls were subjected to the same procedure but were administered phosphate-buffered saline (PBS). The spinal cord was removed and subjected to histological analysis. S. mansoni eggs were found in the spinal cord of 25% of the infected animals, which belonged to the groups that exhibited more significant reduction of the superficial mechanical sensitivity, thermal sensitivity and muscle strength. This model proved to be satisfactory to assess functional changes in Wistar rats and might be used in studies investigating the pathogenesis of SMR. To our knowledge, this is the first experimental model of SMR. Highlights This is the first animal model of schistosomal myeloradiculopathy. Shistosoma mansoni eggs were found in the spinal cord of 25% of the animals. The animals presented reduction of the superficial mechanical and thermal sensitivity. The animals presented decrease in muscle strength. Graphical abstract Schistosoma mansoni egg in a sagittal section of the spinal cord from an animal with schistosomal myeloradiculopathy. [DISPLAY OMISSION]

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  3. [해외논문]   Ecological characteristics of Simulium breeding sites in West Africa   SCI SCIE

    Cheke, Robert A. (Natural Resources Institute, University of Greenwich at Medway, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK ) , Young, Stephen (Natural Resources Institute, University of Greenwich at Medway, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK ) , Garms, Rolf (Bernhard Nocht Institute for Tropical Medicine, Bernhard-Nocht-Str. 74, 20359, Hamburg, Germany)
    Acta tropica v.167 ,pp. 148 - 156 , 2017 , 0001-706x ,

    초록

    Abstract Twenty-nine taxa of Simulium were identified amongst 527 collections of larvae and pupae from untreated rivers and streams in Liberia (362 collections in 1967–71 & 1989), Togo (125 in 1979–81), Benin (35 in 1979–81) and Ghana (5 in 1980–81). Presence or absence of associations between different taxa were used to group them into six clusters using Ward agglomerative hierarchical cluster analysis. Environmental data associated with the pre-imaginal habitats were then analysed in relation to the six clusters by one way ANOVA. The results revealed significant effects in determining the clusters of maximum river width (all P Simulium damnosum species complex, whose breeding site distributions were further analysed by canonical correspondence analysis (CCA), a method also applied to the data on non-vector species.

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  4. [해외논문]   Schistosoma antigens downregulate CXCL9 production by PBMC of HTLV-1-infected individuals   SCI SCIE

    Lima, Luciane Mota (Serviço de Imunologia, Hospital Universitário Professor Edgard Santos, Brazil ) , Cardoso, Luciana Santos (Serviço de Imunologia, Hospital Universitário Professor Edgard Santos, Brazil ) , Santos, Silvane Braga (Serviço de Imunologia, Hospital Universitário Professor Edgard Santos, Brazil ) , Oliveira, Ricardo Riccio (Serviço de Imunologia, Hospital Universitário Professor Edgard Santos, Brazil ) , Oliveira, Sé (Instituto de Ciências Biológicas, Departamento de Bioquímica e Imunologia, Universidade Federal de Minas Gerais, Brazil ) , rgio Costa (Instituto de Ciências Biológicas, Departamento de Bioquímica e Imunologia, Universidade Federal de Minas Gerais, Brazil ) , Gó (Australian Institute of Tropical Health and Medicine, James Cook University, Queensland, Australia ) , es, Alfredo Miranda (Serviço de Imunologia, Hospital Universitário Professor Edgard Santos, Brazil) , Loukas, Alex , Araujo, Maria Ilma
    Acta tropica v.167 ,pp. 157 - 162 , 2017 , 0001-706x ,

    초록

    Abstract HTLV-1 is the causal agent of Adult T cell Leukemia/lymphoma (ATLL) and HTLV-1-associated Myelopathy/Tropical Spastic Paraparesis (HAM/TSP). The immune response to HTLV-1-infection is polarized to the Th1-type, and the presence of CXCL9/CXCL10 chemokines may lead to an increase in the recruitment of pro-inflammatory molecules in spinal cord tissue, contributing to the damage observed in the development of HAM/TSP. It has been observed that in chronic helminth-infections, such as schistosomiasis, there is a deviation toward the Th2/regulatory immune response. Objective To evaluate the ability of Schistosoma spp. proteins to decrease the in vitro CXCL9 and CXCL10 production by PBMC of HTLV-1-infected individuals. Methods The Schistosoma proteins rSm29, rSh-TSP-2 and PIII were added to PBMC cultures of HTLV-1-infected individuals and the levels of chemokines in the supernatants were measured using a sandwich ELISA method. Results The addition of rSm29 to the cultures resulted in decreased production of CXCL9 in all the analyzed individuals and HAM/TSP group (18167±9727pg/mL, p=0.044; 20237±6023pg/mL, p=0.028, respectively) compared to the levels in unstimulated cultures (19745±9729pg/mL; 25078±2392pg/mL, respectively). The addition of rSh-TSP-2 decreased the production of CXCL9 in all studied individuals and carriers group (16136±9233pg/mL, p=0.031; 13977±8857pg/mL, p=0.026) vs unstimulated cultures (19745±9729pg/mL; 18121±10508pg/mL, respectively). Addition of PIII did not alter the results. There was no significant change in the levels of CXCL10 by the addition of the studied proteins. Conclusion The Schistosoma proteins used in this study were able to down modulate the production of CXCL9, a chemokine associated with the inflammatory process in HTLV-1-infection. Highlights Schistosoma antigens rSm29 and rSh-TSP-2 reduce the levels of CXCL9 in supernatants of PBMCs of individuals with HTLV-1. Schistosoma Antigens downregulate the levels of CXCL9 and induced high level of IL-10 in PBMC culture of HTLV-1-infected individuals. Schistosoma antigens are able to supress in vitro the levels os proinflammatory chemokines involved in the pathology of HTLV-1 infection.

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  5. [해외논문]   Antiparasitic activity of menadione (vitamin K3) against Schistosoma mansoni in BABL/c mice   SCI SCIE

    Kapadia, Govind J. (Department of Pharmaceutical Sciences, College of Pharmacy, Howard University, Washington, DC 20059, USA ) , Soares, Ingrid A.O. (Research Group on Natural Products, Center for Research in Sciences and Technology, University of Franca, Franca, Brazil ) , Rao, G. Subba (Global Biotechnology Resource Center, 145 Rosewood Drive, Streamwood, IL 60107, USA ) , Badoco, Fernanda R. (Research Group on Natural Products, Center for Research in Sciences and Technology, University of Franca, Franca, Brazil ) , Furtado, Ricardo A. (Research Group on Natural Products, Center for Research in Sciences and Technology, University of Franca, Franca, Brazil ) , Correa, Mariana B. (Research Group on Natural Products, Center for Research in Sciences and Technology, University of Franca, Franca, Brazil ) , Tavares, Denise C. (Research Group on Natural Products, Center for Research in Sciences and Technology, University of Franca, Franca, Brazil ) , Cunha, Wilson R. (Research Group on Natural Products, Center for Research in Sciences and Technology, University of Franca, Franca, Brazil ) , Magalhã (Research Group on Natural Products, Center for Research in Sciences a) , es, Lizandra G.
    Acta tropica v.167 ,pp. 163 - 173 , 2017 , 0001-706x ,

    초록

    Abstract Schistosomiasis is one of the neglected tropical diseases affecting nearly quarter of a billion people in economically challenged tropical and subtropical countries of the world. Praziquantel (PZQ) is the only drug currently available to treat this parasitic disease in spite being ineffective against juvenile worms and concerns about developing resistance to treat reinfections. Our earlier in vitro viability studies demonstrated significant antiparasitic activity of menadione (MEN) (vitamin K 3 ) against Schistosoma mansoni adult worms. To gain insight into plausible mechanism of antischistosomal activity of MEN, its effect on superoxide anion levels in adult worms were studied in vitro which showed significant increases in both female and male worms. Further confirmation of the deleterious morphological changes in their teguments and organelles were obtained by ultrastructural analysis. Genotoxic and cytotoxic studies in male Swiss mice indicated that MEN was well tolerated at the oral dose of 500mg/kg using the criteria of MNPCE frequency and PCE/RBC ratio in the bone marrow of infected animals. The in vivo antiparasitic activity of MEN was conducted in female BALB/c mice infected with S. mansoni and significant reductions ( P P P S. mansoni infection in humans. Highlights LC 50 of menadione (MEN) against S. mansoni adult worms in vitro was 10.49±1.02μM at 24h. MEN induced alterations on tegument and organelles of S. mansoni adult worms in vitr o. MEN increased superoxide anion levels in S. mansoni adult worms in vitro . MEN reduced the number of worms and egg formation in S. mansoni -infected mice in vivo . Above effects of MEN compared reasonably well to currently used drug, praziquantel. Graphical abstract [DISPLAY OMISSION]

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  6. [해외논문]   Spatio-temporal and neighborhood characteristics of two dengue outbreaks in two arid cities of Mexico   SCI SCIE

    Reyes-Castro, Pablo A. (Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA ) , Harris, Robin B. (Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA ) , Brown, Heidi E. (Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA ) , Christopherson, Gary L. (School of Geography and Development, University of Arizona, Tucson, AZ, USA ) , Ernst, Kacey C. (Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA)
    Acta tropica v.167 ,pp. 174 - 182 , 2017 , 0001-706x ,

    초록

    Abstract Little is currently known about the spatial-temporal dynamics of dengue epidemics in arid areas. This study assesses dengue outbreaks that occurred in two arid cities of Mexico, Hermosillo and Navojoa, located in northern state of Sonora. Laboratory confirmed dengue cases from Hermosillo (N=2730) and Navojoa (N=493) were geocoded by residence and assigned neighborhood-level characteristics from the 2010 Mexican census. Kernel density and Space-time cluster analysis was performed to detect high density areas and space-time clusters of dengue. Ordinary Least Square regression was used to assess the changing socioeconomic characteristics of cases over the course of the outbreaks. Both cities exhibited contiguous patterns of space-time clustering. Initial areas of dissemination were characterized in both cities by high population density, high percentage of occupied houses, and lack of healthcare. Future research and control efforts in these regions should consider these space-time and socioeconomic patterns.

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  7. [해외논문]   Multiple-host pathogens in domestic hunting dogs in Nicaragua's BosawAs Biosphere Reserve   SCI SCIE

    Fiorello, Christine V. (One Health Institute, USA ) , Straub, Mary H. (Department of Medicine and Epidemiology, USA ) , Schwartz, Laura M. (Veterinary Medical Teaching Hospital, One Shields Avenue, School of Veterinary Medicine, University of California, Davis, CA 95616, USA ) , Liu, James (Veterinary Medical Teaching Hospital, One Shields Avenue, School of Veterinary Medicine, University of California, Davis, CA 95616, USA ) , Campbell, Amanda (Veterinary Medical Teaching Hospital, One Shields Avenue, School of Veterinary Medicine, University of California, Davis, CA 95616, USA ) , Kownacki, Alexa K. (Department of Medicine and Epidemiology, USA ) , Foley, Janet E. (Department of Medicine and Epidemiology, USA)
    Acta tropica v.167 ,pp. 183 - 190 , 2017 , 0001-706x ,

    초록

    Abstract Nicaragua’s BosawAs Biosphere Reserve is a vast forested area inhabited largely by indigenous Mayangna and Miskitu people. Most BosawAs residents rely on subsistence hunting and swidden agriculture, and hunting dogs are important for finding and securing wild game. We investigated the health of hunting dogs in three communities differing in location, size, and economy. Dogs in all communities were nutritionally compromised and experienced a heavy burden of disease. Seroprevalence of canine distemper, canine parvovirus, Rickettsia rickettsii , and Leptospira spp. exceeded 50% of dogs. At least one dog was actively shedding leptospires in urine, and many dogs were anemic and/or dehydrated. These dogs interact with wildlife in the forest and humans and domestic livestock in the communities, and may therefore serve as sources of zoonotic and wildlife diseases. BosawAs represents one of the largest intact tracts of habitat for jaguars ( Panthera onca ) in Central America, and given that these communities are located within the forest, jaguars may be at risk from disease spillover from hunting dogs. Dog owners reported that four of 49 dogs had been attacked and killed by jaguars in the past year, and that retaliatory killing of jaguars was sometimes practiced. Disease spillover from dogs to wildlife could occur both in the course of dogs’ hunting activities as well as during jaguar attacks. A better understanding of dog depredation by jaguars, pathogen exposure in jaguars, and a management strategy for the hunting dog population, are urgently needed to mitigate these dual threats to jaguars, improve the lives of hunting dogs, and safeguard the health of their owners.

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  8. [해외논문]   Occurrence and first molecular characterization of Sarcocystis spp. in wild boars (Sus scrofa) and domestic pigs (Sus scrofa domesticus) in Romania: Public health significance of the isolates   SCI SCIE

    Imre, Ká (Department of Animal Production and Veterinary Public Health, Faculty of Veterinary Medicine, Banat's University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania” Timişoara, Calea Aradului no. 119, 300645 Timişoara, Romania ) , lmá (Department of Animal Production and Veterinary Public Health, Faculty of Veterinary Medicine, Banat's University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania” Timişoara, Calea Aradului no. 119, 300645 Timişoara, Romania ) , n (Department of Animal Production and Veterinary Public Health, Faculty of Veterinary Medicine, Banat's University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania” Timişoara, Calea Aradului no. 119, 300645 Timişoara, Romania ) , Sala, Claudia (Department of Parasitology and Parasitic Diseases, Faculty of Veterinary Medicine, Banat's University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania” Ti) , Morar, Adriana , Imre, Mirela , Ciontu, Că , tă , lin , Chisă , liț , ă , , Ion , Dudu, Andreea , Matei, Marius , Dă , ră , buș , , Gheorghe
    Acta tropica v.167 ,pp. 191 - 195 , 2017 , 0001-706x ,

    초록

    Abstract Domestic and wild pigs, as intermediate hosts, can harbor tissue cysts of three Sarcocystis species namely S. miescheriana , S. suihominis and S. porcifelis . Out of them, S. suihominis is zoonotic. Romania is a country with high consumption of raw and/or undercooked traditional pork products. This fact may greatly favor the acquiring of the zoonotic Sarcocystis infections by humans, as definitive host. Based on this consideration and in order to investigate the occurrence and public health significance of Sarcocystis spp. in two western counties (Caraş-Severin and Timiş) of Romania, a total of 165 heart samples from hunted wild boars ( Sus scrofa , n=101) and home slaughtered domestic pigs ( Sus scrofa domesticus , n=64) were screened using microscopic fresh examination and molecular methods. Microscopic examination revealed the presence of sarcocysts in 60.4% of wild boars, and 23.4% of domestic pigs. Genetic characterization of isolates through the PCR-RFLP procedure, targeting the 18S rRNA gene, was successfully achieved for all microscopically positive samples, indicating the presence of a single species, S. miescheriana , in both hosts. The identity of 13 selected S. miescheriana isolates was also confirmed through sequencing. The tested hosts older than 27 months were found to be significantly higher infected ( p Sarcocystis than the 6 to ≤27months age group. Although the human infective S. suihominis has not been registered, for a more reliable epidemiological picture, further molecular studies enrolling a larger number of animals and diagnosis on human intestinal Sarcocystis infections are still necessary. Highlights Sarcocystis spp. prevalence in wild boars and domestic pigs of Western Romania is high. Sarcocystis miescheriana was the only identified species. Hosts older than 27 months were significantly higher ( p The lack of identification of S. suihominis suggests that the screened animals play a neglected role in the spreading of the zoonotic Sarcocystis infections.

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  9. [해외논문]   First characterization of viruses from freshwater snails of the genus Biomphalaria, the intermediate host of the parasite Schistosoma mansoni   SCI SCIE

    Galinier, Richard (Corresponding author.) , Tetreau, Guillaume , Portet, Anaï , s , Pinaud, Silvain , Duval, David , Gourbal, Benjamin
    Acta tropica v.167 ,pp. 196 - 203 , 2017 , 0001-706x ,

    초록

    Abstract We report the genome sequence and organization of five viruses infecting snails of both Biomphalaria glabrata and Biomphalaria pfeifferi , which are vectors of the intestinal schistosomiasis. Four viruses presented a polyadenylated positive single strand RNA genome encoding one or two large open reading frames (ORFs) flanked by untranslated region. Conserved protein motifs typical of the picorna-like virus superfamily were identified in these viruses but they all presented different genome organization. Phylogenetic analysis confirmed their assignment to this superfamily. The partially characterized fifth virus presented sequence similarity for Totiviridae , a family of non-polyadenylated double-strand RNA viruses. Virus distribution and relative abundance between the five strains of Biomphalaria originating from different geographical areas was determined. Our results provide valuable information of new viruses from Biomphalaria and pave the way for future studies dedicated to their impact on snail fitness and Biomphalaria / Schistosoma interactions. Highlights Five RNA viruses were isolated from five Biomphalaria strains. Four on five viruses may belong to Picorna-like virus superfamily. One virus presents similarity with Totiviridae family. Viruses are differentially represented between snail strains. Graphical abstract [DISPLAY OMISSION]

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  10. [해외논문]   Snail shells as larval habitat of Limatus durhamii (Diptera: Culicidae) in the Yungas of Argentina   SCI SCIE

    Mangudo, Carolina (Instituto de Investigaciones en Energía No Convencional (INENCO, UNSa - CONICET), Av. Bolivia 5150, A4400FVY, Salta, Argentina ) , Campos, Raú (Instituto de Limnología “Dr. Raúl A. Ringuelet”, Universidad Nacional de La Plata −) , l E. (CONICET, CCT La Plata, Boulevard 120 y 62 −) , Rossi, Gustavo C. (Casilla de Correo N° 712, 1900, La Plata, Buenos Aires, Argentina ) , Gleiser, Raquel M. (CEPAVE-Centro de Estudios Parasitológicos y de Vectores CCT La Plata, Argentina )
    Acta tropica v.167 ,pp. 204 - 207 , 2017 , 0001-706x ,

    초록

    Abstract The shells of dead snails collect water from rainfalls producing aquatic microenvironments called gastrotelmata. These habitats are small and hold simple detritus based on animal communities, being rotifers and culicids the most studied. Although a high diversity of aquatic microhabitats has been reported as larval habitats of mosquitoes in Argentina, the shell of snails has not been investigated yet. We report the shells of three species of native Megalobulimus genus as larval habitats of a neotropical mosquito and suspected vector of bunyaviruses, Limatus durhamii , and describe these microhabitats in the Yungas forest of Argentina. Highlights Shells of three species of Megalobulimus snails were mosquito larval habitats. The aquatic fauna was Li. durhamii immature and Psychodidae larvae. The average number of Li. durhamii per snail shell was 11.6, ranged from 1 to 27. Water volume had a significant effect on mosquito abundance. Graphical abstract The shells of three species of Megalobulimus genus are larval habitats of a native mosquito, Limatus durhamii , in the Yungas forest of Argentina. [DISPLAY OMISSION]

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