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  1 / 23 MEDLINE  
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[PMID]:28130671
[Au] Autor:Bernot JP; Boxshall GA
[Ad] Endereço:Institute for Biomedical Sciences, George Washington University, 2300 Eye Street NW, Washington, DC, 20037, USA. jbernot@gwu.edu.
[Ti] Título:A new species of Pseudopandarus Kirtisinghe, 1950 (Copepoda: Siphonostomatoida: Pandaridae) from sharks of the genus Squalus L. in New Caledonian waters.
[So] Source:Syst Parasitol;94(2):275-291, 2017 Feb.
[Is] ISSN:1573-5192
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Both sexes of a new species of pandarid copepod are described from sharks of the genus Squalus L. (Squaliformes: Squalidae). Specimens of Pseudopandarus cairae n. sp. were collected from Squalus bucephalus Last, Séret & Pogonoski and S. melanurus Fourmanoir & Rivaton in New Caledonian waters, the first parasitic copepod to be described from either host species. This is the eighth nominal species of Pseudopandarus Kirtisinghe, 1950 and the first to be described from a shark of the order Squaliformes. Pseudopandarus cairae n. sp. is easily distinguished from P. australis Cressey & Simpfendorfer, 1988, P. longus (Gnanamuthu, 1951) Cressey, 1967, and P. pelagicus Rangnekar, 1977 in having the female genital complex concealed beneath an elongate dorsal genital shield with a trilobed posterior margin. It can be distinguished from P. gracilis Kirtisinghe, 1950 and P. scyllii Yamaguti & Yamasu, 1959 by the armature of the leg 4 endopod and by the proportions of the dorsal genital shield. The new species is unique among known species of Pseudopandarus in its possession of only 1 setal element on the distal endopod segment of leg 4. In addition to describing the new species, the host associations of all species of Pseudopandarus are reviewed and observations are made regarding sexual dimorphism and mode of attachment. A key to the species considered valid is provided.
[Mh] Termos MeSH primário: Copépodes/classificação
Squalus/parasitologia
[Mh] Termos MeSH secundário: Animais
Copépodes/anatomia & histologia
Feminino
Masculino
Nova Caledônia
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:171101
[Lr] Data última revisão:
171101
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170129
[St] Status:MEDLINE
[do] DOI:10.1007/s11230-016-9692-2


  2 / 23 MEDLINE  
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[PMID]:28093310
[Au] Autor:Deck CA; Gary Anderson W; Walsh PJ
[Ad] Endereço:Department of Biology, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada; Bamfield Marine Sciences Centre, Bamfield, British Columbia V0R 1B0, Canada. Electronic address: cdeck023@uottawa.ca.
[Ti] Título:Effects of glucose and insulin administration on glucose transporter expression in the North Pacific spiny dogfish (Squalus suckleyi).
[So] Source:Gen Comp Endocrinol;247:46-52, 2017 Jun 01.
[Is] ISSN:1095-6840
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Elasmobranchs (sharks, skates, and rays) are a primarily carnivorous group of fish, consuming few carbohydrates. Further, they tend to exhibit delayed responses to glucose and insulin administration in vivo relative to mammals, leading to a presumption of glucose-intolerance. To investigate the glucoregulatory capabilities of the spiny dogfish (Squalus suckleyi), plasma glucose concentration, muscle and liver glycogen content, and glucose transporter (glut1 and 4) mRNA levels were measured following intra-arterial administration of bovine insulin (10ngkg ) or an approximate doubling of fasting plasma glucose concentration. Within 6h, following glucose administration, approximately half of the introduced glucose load had been cleared, with control levels being restored by 24h post-injection. It was determined that plasma clearance was due in part to increased uptake by the tissues as muscle and liver glycogen content increased significantly, correlating with an upregulation of glut mRNA levels. Following administration of bovine insulin, plasma glucose steadily decreased through 18h before returning toward control levels. Observed decreases in plasma glucose following insulin injection were, however, relatively minor, and no increases in tissue glycogen content were observed. glut4 and glycogen synthase mRNA levels did significantly increase in the muscle in response to insulin, but no changes occurred in the liver. The responses observed mimic what occurs in mammals and teleosts, thus suggesting a conserved mechanism for glucose homeostasis in vertebrates and a high degree of glucose tolerance in these predominantly carnivorous fish.
[Mh] Termos MeSH primário: Proteínas Facilitadoras de Transporte de Glucose/metabolismo
Glucose/farmacologia
Insulina/farmacologia
Squalus/metabolismo
[Mh] Termos MeSH secundário: Animais
Glicemia/metabolismo
Bovinos
Glucose/administração & dosagem
Transportador de Glucose Tipo 4/metabolismo
Glicogênio/metabolismo
Glicogênio Sintase/genética
Glicogênio Sintase/metabolismo
Insulina/administração & dosagem
Fígado/efeitos dos fármacos
Fígado/metabolismo
Masculino
Músculo Esquelético/efeitos dos fármacos
Músculo Esquelético/metabolismo
RNA Mensageiro/genética
RNA Mensageiro/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Blood Glucose); 0 (Glucose Transport Proteins, Facilitative); 0 (Glucose Transporter Type 4); 0 (Insulin); 0 (RNA, Messenger); 9005-79-2 (Glycogen); EC 2.4.1.11 (Glycogen Synthase); IY9XDZ35W2 (Glucose)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171009
[Lr] Data última revisão:
171009
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170118
[St] Status:MEDLINE


  3 / 23 MEDLINE  
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[PMID]:28062996
[Au] Autor:Dippenaar SM
[Ad] Endereço:Department of Biodiversity, University of Limpopo, Private Bag X1106, Sovenga, 0727, South Africa. susan.dippenaar@ul.ac.za.
[Ti] Título:Trebius benzi n. sp. (Siphonostomatoida: Trebiidae) infecting Squalus acutipinnis Regan off South Africa.
[So] Source:Syst Parasitol;94(1):91-96, 2017 Jan.
[Is] ISSN:1573-5192
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Trebius Krøyer, 1838 currently consists of 15 accepted species all infecting elasmobranchs. Apart from two species, i.e. T. caudatus Krøyer, 1838 and T. latifurcatus Wilson, 1921, that have been reported from ten and eight host species, respectively, the other 13 species have each been reported from only one or two host species. Trebius benzi n. sp., collected from Squalus acutipinnis Regan, is described and illustrated after examination through stereo- and compound microscopes. This species can be distinguished from the other known species by a combination of characters including an abdomen that is shorter than the genital complex, a maxillule with an endite that consists of a single-tined dentiform process, sternal furca tines that are blunt and as long as the base, and the innermost spine of the last exopodal segment of leg 1 the shortest.
[Mh] Termos MeSH primário: Copépodes/classificação
Squalus/parasitologia
[Mh] Termos MeSH secundário: Animais
Copépodes/anatomia & histologia
África do Sul
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:171101
[Lr] Data última revisão:
171101
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170108
[St] Status:MEDLINE
[do] DOI:10.1007/s11230-016-9679-z


  4 / 23 MEDLINE  
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[PMID]:27395700
[Au] Autor:Viana ST; Carvalho MR; Gomes UL
[Ad] Endereço:Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo. Rua do Matão, Trav. 14, no. 101, CEP 05508-090, São Paulo, SP, Brazil.; Email: stviana@usp.br.
[Ti] Título:Taxonomy and morphology of species of the genus Squalus Linnaeus, 1758 from the Southwestern Atlantic Ocean (Chondrichthyes: Squaliformes: Squalidae).
[So] Source:Zootaxa;4133(1):1-89, 2016 Jul 04.
[Is] ISSN:1175-5334
[Cp] País de publicação:New Zealand
[La] Idioma:eng
[Ab] Resumo:Squalus is a genus of reportedly cosmopolitan shark species that have a high taxonomic complexity due to difficulties in their morphological differentiation; many of its species need revision. Currently, there are 26 valid species of Squalus, which have been divided into three species-groups according to overall morphological similarity, the S. acanthias, S. megalops, and S. mitsukurii groups. Loss of type specimens, propagation of erroneous identifications in the literature, and difficulties in obtaining representative series for comparison are secondary challenges that have impeded a global taxonomic revision of the genus. This problem applies clearly to species from the Southwestern Atlantic Ocean, including species that occur off Brazil. Following a current global tendency, a regional taxonomic revision of Squalus was conducted in order to investigate which species are valid in the Southwestern Atlantic Ocean and provide diagnostic morphological characters that can be efficiently used for identifying species. Comparative detailed analysis of external (e.g. morphometrics, dentition, and color pattern) and skeletal morphology (primarily meristic data, neurocrania and claspers) of specimens of Squalus from the region revealed four new species that are herein described (S. albicaudus sp. nov., S. bahiensis sp. nov., S. lobularis sp. nov., and S. quasimodo sp. nov.), as well as S. acanthias, which is redescribed from the region based on new material. Comparisons are offered based on examinations of congeneric species; this work is part of a global systematic revision of Squalus.
[Mh] Termos MeSH primário: Squalus/anatomia & histologia
Squalus/classificação
[Mh] Termos MeSH secundário: Animais
Oceano Atlântico
Feminino
Masculino
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170313
[Lr] Data última revisão:
170313
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160711
[St] Status:MEDLINE
[do] DOI:10.11646/zootaxa.4133.1.1


  5 / 23 MEDLINE  
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[PMID]:27225942
[Au] Autor:Sheath DJ; Andreou D; Britton JR
[Ad] Endereço:Department of Life and Environmental Sciences,Bournemouth University,BH12 5BB,UK.
[Ti] Título:Interactions of warming and exposure affect susceptibility to parasite infection in a temperate fish species.
[So] Source:Parasitology;143(10):1340-6, 2016 Sep.
[Is] ISSN:1469-8161
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Predicting how elevated temperatures from climate change alter host-parasite interactions requires understandings of how warming affects host susceptibility and parasite virulence. Here, the effect of elevated water temperature and parasite exposure level was tested on parasite prevalence, abundance and burden, and on fish growth, using Pomphorhynchus laevis and its fish host Squalius cephalus. At 60 days post-exposure, prevalence was higher at the elevated temperature (22 °C) than ambient temperature (18 °C), with infections achieved at considerably lower levels of exposure. Whilst parasite number was significantly higher in infected fish at 22 °C, both mean parasite weight and parasite burden was significantly higher at 18 °C. There were, however, no significant relationships between fish growth rate and temperature, parasite exposure, and the infection parameters. Thus, whilst elevated temperature significantly influenced parasite infection rates, it also impacted parasite development rates, suggesting warming could have complex implications for parasite dynamics and host resistance.
[Mh] Termos MeSH primário: Acantocéfalos/isolamento & purificação
Mudança Climática
Doenças dos Peixes/parasitologia
Helmintíase Animal/parasitologia
Squalus/parasitologia
[Mh] Termos MeSH secundário: Acantocéfalos/fisiologia
Animais
Suscetibilidade a Doenças
Interações Hospedeiro-Parasita
Carga Parasitária
Prevalência
Squalus/crescimento & desenvolvimento
Squalus/fisiologia
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170915
[Lr] Data última revisão:
170915
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160527
[St] Status:MEDLINE
[do] DOI:10.1017/S0031182016000846


  6 / 23 MEDLINE  
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[PMID]:27106538
[Au] Autor:Cox GK; Kennedy GE; Farrell AP
[Ad] Endereço:Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada.
[Ti] Título:Morphological arrangement of the coronary vasculature in a shark (Squalus sucklei) and a teleost (Oncorhynchus mykiss).
[So] Source:J Morphol;277(7):896-905, 2016 Jul.
[Is] ISSN:1097-4687
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The coronary circulation is of great importance in maintaining cardiovascular function and consequently it has been extensively studied in many mammalian species. However, much less attention has been paid to the coronary circulation in other vertebrates. For example, while elasmobranch fishes are of special interest as they are the most ancient lineage of vertebrates to possess a coronary circulation, only qualitative studies exist on their coronary circulation and most concern the architecture of the large arteries. Our study tested the prediction that the coronary circulation of sharks is better developed than previously thought. However, to test this idea, a methodology was needed to quantify vascularity, vessel morphology and oxygen diffusion distances in a heart with predominantly spongy myocardium. Here, we describe this methodology using dogfish and rainbow trout and suggest that the dogfish spongy myocardium appears to rely predominantly on the coronary circulation for its oxygen supply, an arrangement that contrasts with the spongy myocardial tissue of rainbow trout. In support of this suggestion, the density of the microvasculature of the spongy myocardial tissue of dogfish exceeded that of their compact tissue. Although vascularity in the compact myocardium of dogfish was significantly lower than trout, intervascular distances were similar on account of a significantly larger vessel diameter in dogfish, which corresponds to a larger red blood cell size of the dogfish when compared to trout. J. Morphol. 277:896-905, 2016. © 2016 Wiley Periodicals, Inc.
[Mh] Termos MeSH primário: Vasos Coronários/anatomia & histologia
Oncorhynchus mykiss/anatomia & histologia
Squalus/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Circulação Coronária
Oncorhynchus mykiss/fisiologia
Squalus/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170713
[Lr] Data última revisão:
170713
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160424
[St] Status:MEDLINE
[do] DOI:10.1002/jmor.20543


  7 / 23 MEDLINE  
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[PMID]:26686463
[Au] Autor:Deck CA; Bockus AB; Seibel BA; Walsh PJ
[Ad] Endereço:Department of Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada; Bamfield Marine Sciences Centre, Bamfield, BC V0R 1B0, Canada. Electronic address: cdeck023@uottawa.ca.
[Ti] Título:Effects of short-term hyper- and hypo-osmotic exposure on the osmoregulatory strategy of unfed North Pacific spiny dogfish (Squalus suckleyi).
[So] Source:Comp Biochem Physiol A Mol Integr Physiol;193:29-35, 2016 Mar.
[Is] ISSN:1531-4332
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The North Pacific spiny dogfish (Squalus suckleyi) is a partially euryhaline species of elasmobranch that often enter estuaries where they experience relatively large fluctuations in environmental salinity that can affect plasma osmolality. Previous studies have investigated the effects of altered salinity on elasmobranchs over the long term, but fewer studies have conducted time courses to investigate how rapidly they can adapt to such changes. In this study, we exposed unfed (no exogenous source of nitrogen or TMAO) spiny dogfish to hyper- and hypo-osmotic conditions and measured plasma and tissue osmolytes, nitrogen excretion, and changes in enzyme activity and mRNA levels in the rectal gland over 24h. It was shown that plasma osmolality changes to approximately match the ambient seawater within 18-24h. In the hypersaline environment, significant increases in urea, sodium, and chloride were observed, whereas in the hyposaline environment, only significant decreases in TMAO and sodium were observed. Both urea and ammonia excretion increased at low salinities suggesting a reduction in urea retention and possibly urea production. qPCR and enzyme activity data for Na(+)/K(+)-ATPase did not support the idea of rectal gland activation following exposure to increased salinities. Therefore, we suggest that the rectal gland may not be a quantitatively important aspect of the dogfish osmoregulatory strategy during changes in environmental salinity, or it may be active only in the very early stages (i.e., less than 6h) of responses to altered salinity.
[Mh] Termos MeSH primário: Osmorregulação/fisiologia
Osmose/fisiologia
Squalus/fisiologia
[Mh] Termos MeSH secundário: Amônia/metabolismo
Animais
Cloretos/metabolismo
Salinidade
Glândula de Sal/metabolismo
Glândula de Sal/fisiologia
Água do Mar
Sódio/metabolismo
ATPase Trocadora de Sódio-Potássio/metabolismo
Squalus/metabolismo
Ureia/metabolismo
Equilíbrio Hidroeletrolítico/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
0 (Chlorides); 7664-41-7 (Ammonia); 8W8T17847W (Urea); 9NEZ333N27 (Sodium); EC 3.6.3.9 (Sodium-Potassium-Exchanging ATPase)
[Em] Mês de entrada:1610
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151222
[St] Status:MEDLINE


  8 / 23 MEDLINE  
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[PMID]:25244375
[Au] Autor:Zimmer AM; Wood CM
[Ad] Endereço:Department of Biology, McMaster University, Hamilton, Ontario L8S 4K1, Canada; 2Bamfield Marine Sciences Centre, Bamfield, British Columbia V0R 1B0, Canada; 3Department of Zoology, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada, and Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Miami, Florida 33149.
[Ti] Título:Exposure to acute severe hypoxia leads to increased urea loss and disruptions in acid-base and ionoregulatory balance in dogfish sharks (Squalus acanthias).
[So] Source:Physiol Biochem Zool;87(5):623-39, 2014 Sep-Oct.
[Is] ISSN:1537-5293
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The effects of acute moderate (20% air O2 saturation; 6-h exposure) and severe (5% air O2 saturation; 4-h exposure) hypoxia on N-waste, acid-base, and ion balance in dogfish sharks (Squalus acanthias suckleyi) were evaluated. We predicted that the synthesis and/or retention of urea, which are active processes, would be inhibited by hypoxia. Exposure to moderate hypoxia had negligible effects on N-waste fluxes or systemic physiology, except for a modest rise in plasma lactate. Exposure to severe hypoxia led to a significant increase in urea excretion (Jurea), while plasma, liver, and muscle urea concentrations were unchanged, suggesting a loss of urea retention. Ammonia excretion (Jamm) was elevated during normoxic recovery. Moreover, severe hypoxia led to disruptions in acid-base balance, indicated by a large increase in plasma [lactate] and substantial decreases in arterial pHa and plasma [Formula: see text], as well as loss of ionic homeostasis, indicated by increases in plasma [Mg(2+)], [Ca(2+)], and [Na(+)]. We suggest that severe hypoxia in dogfish sharks leads to a reduction in active gill homeostatic processes, such as urea retention, acid-base regulation and ionoregulation, and/or an osmoregulatory compromise due to increased functional gill surface area. Overall, the results provide a comprehensive picture of the physiological responses to a severe degree of hypoxia in an ancient fish species.
[Mh] Termos MeSH primário: Oxigênio/metabolismo
Squalus acanthias/fisiologia
Ureia/metabolismo
Equilíbrio Hidroeletrolítico
[Mh] Termos MeSH secundário: Anaerobiose
Animais
Concentração de Íons de Hidrogênio
Masculino
Squalus
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
8W8T17847W (Urea); S88TT14065 (Oxygen)
[Em] Mês de entrada:1507
[Cu] Atualização por classe:140923
[Lr] Data última revisão:
140923
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140923
[St] Status:MEDLINE
[do] DOI:10.1086/677884


  9 / 23 MEDLINE  
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[PMID]:24518388
[Au] Autor:Guffey SC; Goss GG
[Ad] Endereço:Department of Biological Sciences, CW405 Biological Sciences Bldg, University of Alberta, Edmonton, AB T6G 2E9, Canada; Bamfield Marine Sciences Centre, 100 Pachena Road, Bamfield, BC V0R 1B0, Canada. Electronic address: guffey@ualberta.ca.
[Ti] Título:Time course of the acute response of the North Pacific spiny dogfish shark (Squalus suckleyi) to low salinity.
[So] Source:Comp Biochem Physiol A Mol Integr Physiol;171:9-15, 2014 May.
[Is] ISSN:1531-4332
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Dogfish are considered stenohaline sharks but are known to briefly enter estuaries. The acute response of North Pacific spiny dogfish (Squalus suckleyi) to lowered salinity was tested by exposing sharks to 21‰ salinity for 48 h. Temporal trends in blood pH, plasma osmolality, CO2, HCO3(-), Na(+), Cl(-), K(+), and urea concentrations, and in the rates of urea efflux and O2 consumption, were quantified. The rate of O2 consumption exhibited cyclic variation and was significantly depressed by lowered salinity. After 9 h, plasma [Cl(-)] stabilized at 9% below initial levels, while plasma [Na(+)] decreased by more than 20% within the first 12 h. Plasma [urea] dropped by 15% between 4 and 6 h, and continued to decrease. The rate of urea efflux increased over time, peaking after 36 h at 72% above the initial rate. Free-swimming sharks subjected to the same salinity challenge survived over 96 h and differed from cannulated sharks with respect to patterns of Na(+) and urea homeostasis. This high-resolution study reveals that dogfish exposed to 21‰ salinity can maintain homeostasis of Cl(-) and pH, but Na(+) and urea continue to be lost, likely accounting for the inability of the dogfish to fully acclimate to reduced salinity.
[Mh] Termos MeSH primário: Salinidade
Squalus/fisiologia
[Mh] Termos MeSH secundário: Animais
Artérias/metabolismo
Dióxido de Carbono/sangue
Cloretos/sangue
Concentração de Íons de Hidrogênio
Concentração Osmolar
Consumo de Oxigênio
Oceano Pacífico
Potássio/sangue
Sódio/sangue
Squalus/sangue
Fatores de Tempo
Ureia/sangue
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Chlorides); 142M471B3J (Carbon Dioxide); 8W8T17847W (Urea); 9NEZ333N27 (Sodium); RWP5GA015D (Potassium)
[Em] Mês de entrada:1411
[Cu] Atualização por classe:140318
[Lr] Data última revisão:
140318
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140213
[St] Status:MEDLINE


  10 / 23 MEDLINE  
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[PMID]:22779111
[Au] Autor:Pickering M; Caira JN
[Ad] Endereço:Department of Ecology and Evolutionary Biology, 75 N. Eagleville Rd., Unit 3043, University of Connecticut, Storrs, Connecticut 06269-3043, USA. maria.pickering@uconn.edu
[Ti] Título:A new hyperapolytic species, Trilocularia eberti sp. n. (Cestoda: Tetraphyllidea), from Squalus cf. mitsukurii (Squaliformes: Squalidae) off South Africa with comments on its development and fecundity.
[So] Source:Folia Parasitol (Praha);59(2):107-14, 2012 Jun.
[Is] ISSN:0015-5683
[Cp] País de publicação:Czech Republic
[La] Idioma:eng
[Ab] Resumo:A new species of tetraphyllidean cestode in the genus Trilocularia is described from an undescribed shark species, Squalus cf. mitsukurii, off the coast of South Africa. Trilocularia eberti sp. n. is the second known member of its genus, and like its congener, T. gracilis (Olsson, 1866-1867) Olsson, 1869, is extremely hyperapolytic, dropping proglottids from its strobila while they are still very immature. Characteristic of the genus, it possesses a distinctive scolex with triloculated bothridia, but differs conspicuously from its congener in its possession of an anterior loculus that is much larger in width relative to the paired posterior loculi, and also in its possession of an anterior, enlarged region of its free proglottids that is triangular with a slit-like ventral aperture, rather than rounded and cup-like. This anterior region of the free proglottid is used in attachment, and its development is described. For assessment of fecundity, an attempt was made to record all free proglottids of all ages found in both host individuals, and yielded an average estimate of 362 free proglottids being produced per individual worm of T. eberti sp. n. Both Trilocularia species parasitize sharks of the genus Squalus, and given the host specificity typically exhibited by tetraphyllideans and preliminary examinations of other members of this shark genus, it is likely that other Squalus species will be found to host additional new Trilocularia species.
[Mh] Termos MeSH primário: Cestoides/classificação
Infecções por Cestoides/veterinária
Doenças dos Peixes/parasitologia
Squalus/parasitologia
[Mh] Termos MeSH secundário: Animais
Cestoides/anatomia & histologia
Cestoides/fisiologia
Infecções por Cestoides/epidemiologia
Infecções por Cestoides/parasitologia
Fertilidade
Doenças dos Peixes/epidemiologia
Microscopia Eletrônica de Varredura/veterinária
Oceanos e Mares/epidemiologia
Reprodução/fisiologia
África do Sul
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Em] Mês de entrada:1208
[Cu] Atualização por classe:121115
[Lr] Data última revisão:
121115
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:120712
[St] Status:MEDLINE



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