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Registros recuperados: 6
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Novel 12S mtDNA findings in sloths (Pilosa, Folivora) and anteaters (Pilosa, Vermilingua) suggest a true case of long branch attraction Genet. Mol. Biol.
Barros,Maria Claudene; Sampaio,Iracilda; Schneider,Horacio.
We sequenced 12S RNA mtDNA for the majority of the extant species of sloths and anteaters and compared our results with previous data obtained by our group using 16S RNA mtDNA in the same specimens and to GenBank sequences of the extinct giant sloth Mylodon. Our results suggest that pigmy-anteaters may be a case of the long-branch attraction phenomenon and also show the large genetic difference between the Amazonian and Atlantic forest three-toed sloths, contrasting with the small differences observed between the two non-Atlantic forest forms of sloths. These results have important implications for the taxonomy of sloths and anteaters and strongly suggest the placement of pigmy anteaters in their own family (Cyclopidae) and raising the taxonomic status of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anteaters; Molecular evolution; Mylodont; Sloths; Xenarthra.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000400029
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Phylogenetic analysis of 16S mitochondrial DNA data in sloths and anteaters Genet. Mol. Biol.
Barros,Maria Claudene; Sampaio,Iracilda; Schneider,Horacio.
We sequenced part of the 16S rRNA mitochondrial gene in 17 extant taxa of Pilosa (sloths and anteaters) and used these sequences along with GenBank sequences of both extant and extinct sloths to perform phylogenetic analysis based on parsimony, maximum-likelihood and Bayesian methods. By increasing the taxa density for anteaters and sloths we were able to clarify some points of the Pilosa phylogenetic tree. Our mitochondrial 16S results show Bradypodidae as a monophyletic and robustly supported clade in all the analysis. However, the Pleistocene fossil Mylodon darwinii does not group significantly to either Bradypodidae or Megalonychidae which indicates that trichotomy best represents the relationship between the families Mylodontidae, Bradypodidae and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pilosa; Sloths; Anteaters; Phylogeny; Mitochondrial DNA; RDNA16S.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000100002
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An update on the physiology of two- and three-toed sloths BJMBR
Gilmore,D.P.; Da-Costa,C.P.; Duarte,D.P.F..
Physiological and pharmacological research undertaken on sloths during the past 30 years is comprehensively reviewed. This includes the numerous studies carried out upon the respiratory and cardiovascular systems, anesthesia, blood chemistry, neuromuscular responses, the brain and spinal cord, vision, sleeping and waking, water balance and kidney function and reproduction. Similarities and differences between the physiology of sloths and that of other mammals are discussed in detail.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Xenarthra; Sloths; Bradypus; Choloepus; Physiology.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000200001
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Sloth biology: an update on their physiological ecology, behavior and role as vectors of arthropods and arboviruses BJMBR
Gilmore,D.P.; Da Costa,C.P.; Duarte,D.P.F..
This is a review of the research undertaken since 1971 on the behavior and physiological ecology of sloths. The animals exhibit numerous fascinating features. Sloth hair is extremely specialized for a wet tropical environment and contains symbiotic algae. Activity shows circadian and seasonal variation. Nutrients derived from the food, particularly in Bradypus, only barely match the requirements for energy expenditure. Sloths are hosts to a fascinating array of commensal and parasitic arthropods and are carriers of various arthropod-borne viruses. Sloths are known reservoirs of the flagellate protozoan which causes leishmaniasis in humans, and may also carry trypanosomes and the protozoan Pneumocystis carinii.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sloths; Ecology; Behavior; Parasites; Bradypus; Choloepus.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000100002
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Circadian rhythms in blood pressure in free-ranging three-toed sloths (Bradypus variegatus) BJMBR
Duarte,D.P.F.; Silva,V.L.; Jaguaribe,A.M.; Gilmore,D.P.; Da Costa,C.P..
Blood pressure (BP) profiles were monitored in nine free-ranging sloths (Bradypus variegatus) by coupling one common carotid artery to a BP telemetry transmitter. Animals moved freely in an isolated and temperature-controlled room (24ºC) with 12/12-h artificial light-dark cycles and behaviors were observed during resting, eating and moving. Systolic (SBP) and diastolic (DBP) blood pressures were sampled for 1 min every 15 min for 24 h. BP rhythm over 24 h was analyzed by the cosinor method and the mesor, amplitude, acrophase and percent rhythm were calculated. A total of 764 measurements were made in the light cycle and 721 in the dark cycle. Twenty-four-hour values (mean ± SD) were obtained for SBP (121 ± 22 mmHg), DBP (86 ± 17 mmHg), mean BP (MBP, 98 ±...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Sloths; Bradypus; Circadian rhythm; Blood pressure.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000200016
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Dermatophytosis caused by Microsporum canis and Microsporum gypseum in free-living Bradypus variegatus (Schiz, 1825) in the state of Pernambuco, Brazil BJM
Xavier,Gileno Antônio Araújo; Silva,Leonildo Bento Galiza da; Silva,Davi Rubem da; Peixoto,Rodolfo de Moraes; Lino,Gileno Câmara; Mota,Rinaldo Aparecido.
Three cases of dermatophytosis in free living brown-throated three-toed sloths (Bradypus variegatus) in the Zona da Mata, North of Pernambuco State, Brazil, were studied. Two animals presented areas of alopecia on the pelvic member and thorax and one animal on the pelvic member only. The three animals presented scabs. Hair and scabs samples were submitted to microscopical examination after treatment with a 30 % KOH and cultivated in Mycosel Agar. The direct examination indicated the presence of arthrospores in the hair. Colonies grown after seven days of culture were confirmed as Microsporum based on examination of the structure of the macroconidia. This is the first observation of dermatophytosis caused by Microsporum canis and Microsporum gypseum in free...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microsporum canis; Microsporum gypseum; Bradypus variegatus; Dermatophytosis; Sloths.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000300018
Registros recuperados: 6
Primeira ... 1 ... Última
 

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