Results 21 to 30 of about 5,469 (161)
Heterogeneidade de hemoglobina nos peixes da Amazonia [PDF]
Acta Amazonica, 1978 Resumo Os padrões eletroforáticos de hemoglobinas de peixes da Amazônia foram descritos. Os peixes incluíram a pirambóia sul-americana, Lepidosiren paradoxa, quatro espécies de raias de água doce do género Potamotrygon e teleósteos sctinopterígeos de 77 ...
Unni E. H. Fyhn +5 more
doaj +1 more source
Beyond mammals: the evolution of chewing and other forms of oropharyngeal food processing in vertebrates. [PDF]
Biol Rev Camb Philos SocABSTRACT Oropharyngeal food processing exhibits a remarkable diversity among vertebrates, reflecting the evolution of specialised ‘processing centres’ associated with the mandibular, hyoid, and branchial arches. Although studies have detailed various food‐processing strategies and mechanisms across vertebrates, a coherent and comprehensive terminology ...
Schwarz D +6 more
europepmc +2 more sources
Genetic and functional diversity of the multiple lungfish myoglobins
The FEBS Journal, Volume 287, Issue 8, Page 1598-1611, April 2020., 2020 The lungfish harbors multiple copies of the oxygen‐binding protein myoglobin (Mb). Amplification of this gene occurred during an early stage of lungfish evolution. The Mbs are differentially expressed throughout various tissues and display different abilities to bind oxygen or act as enzymes. Remarkably, the main expression site of the Mbs is the brain
Julia Lüdemann +6 more
wiley +1 more source
Ocorrência de hemoglobinas de efeito Root em peixes amazônicos [PDF]
Acta Amazonica, 1978 Resumo O efeito Root foi medido em hemolisados de representantes de 56 gêneros de peixes amazônicos. Hemolisados de várias espécies de peixes de respiração aérea apresentaram efeito Root, contrariamente às hipóteses publicadas.
Martha Farmer +3 more
doaj +1 more source
The Limbs of Lepidosiren Paradoxa [PDF]
Nature, 1894 DR. GUNTHER, in his valuable work, “The Study of Fishes,” says of Natterer's Lepidosiren from the Amazons, “It is one of the greatest desiderata of natural history collections.” In fact, only seven years ago the opinion was current that Natterer had been deceived by specimens of Protopterus imported from Africa, or that in some way African specimens ...
openaire +1 more source
Transição da respiração aquática para a aérea: efeitos do CO2 sobre a função de hemoglobina [PDF]
Acta Amazonica, 1978 Resumo A dependência do pH do efeito específico ao CO2 (pCO2 = 30 torr) sobre os equilíbrios de oxigênio foi medida nas hemoglobinas de quatro espécies de peixe e um anfíbio: Leiostomus xanthurus (teleósteo marinho), Brachyplatystoma sp.
Martha Farmer
doaj +1 more source
RNA‐Mediated Gene Duplication and Retroposons: Retrogenes, LINEs, SINEs, and Sequence Specificity
International Journal of Evolutionary Biology, Volume 2013, Issue 1, 2013., 2013 A substantial number of “retrogenes” that are derived from the mRNA of various intron‐containing genes have been reported. A class of mammalian retroposons, long interspersed element‐1 (LINE1, L1), has been shown to be involved in the reverse transcription of retrogenes (or processed pseudogenes) and non‐autonomous short interspersed elements (SINEs ...
Kazuhiko Ohshima, Frédéric Brunet
wiley +1 more source
Nuclear DNA content of thirty species of Neotropical fishes
Genetics and Molecular Biology, 1998 The present paper reports nuclear DNA content in 30 Neotropical freshwater fish species and summarizes the data on other Neotropical species presented in the literature. Among Neotropical fishes, the nuclear DNA content ranges from 1.04 ± 0.09 pg/nucleus
Margarida Lima Carvalho +2 more
doaj +1 more source
Tras las huellas de la lepidosirena
Revista Brasileira de História da Ciência, 2016 Los llamados “peces pulmonados”, cuyas formas vivas se encuentran en Sudamérica, África y Australia, constituyeron objetos muy codiciados por la ciencia europea del siglo XIX. En torno a los mismos se dieron varios debates sobre su clasificación y luego
Susana V. García
doaj +1 more source