Results 161 to 170 of about 5,493 (196)
Some of the next articles are maybe not open access.
Nature, 2003
Perhaps the most enduring of puzzles in palaeontology has been the identity of Palaeospondylus gunni Traquair, a tiny (5-60-mm) vertebrate fossil from the Middle Devonian period (approximately 385 Myr ago) of Scotland, first discovered in 1890 (refs 1-3). It is known principally from a single site (Achanarras Quarry, Caithness) where, paradoxically, it
Keith S, Thomson +2 more
openaire +2 more sources
Perhaps the most enduring of puzzles in palaeontology has been the identity of Palaeospondylus gunni Traquair, a tiny (5-60-mm) vertebrate fossil from the Middle Devonian period (approximately 385 Myr ago) of Scotland, first discovered in 1890 (refs 1-3). It is known principally from a single site (Achanarras Quarry, Caithness) where, paradoxically, it
Keith S, Thomson +2 more
openaire +2 more sources
2009
Abstract The six species of lungAsh are the living representatives of the Subclass Dipnoi. thesespecies are divided into two suborders (Lepidosirenoidei and Ceratodontoidei) and three families (Lepidosirenidae, Protopteridae, Ceratodontidae) (1).
Matthew P Heinickea +2 more
openaire +1 more source
Abstract The six species of lungAsh are the living representatives of the Subclass Dipnoi. thesespecies are divided into two suborders (Lepidosirenoidei and Ceratodontoidei) and three families (Lepidosirenidae, Protopteridae, Ceratodontidae) (1).
Matthew P Heinickea +2 more
openaire +1 more source
Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2002
Bradykinin (BK) isolated from plasma of the African lungfish, Protopterus annectens, contains four amino acid substitutions compared with BK from mammals (Arg(1)-->Tyr, Pro(2)-->Gly, Pro(7)-->Ala, Phe(8)-->Pro). Bolus intra-arterial injections of synthetic lungfish BK (1-1000 pmol/kg body wt.) into unanaesthetised, juvenile lungfish (n=5) produced a ...
R. J. BALMENT +3 more
openaire +3 more sources
Bradykinin (BK) isolated from plasma of the African lungfish, Protopterus annectens, contains four amino acid substitutions compared with BK from mammals (Arg(1)-->Tyr, Pro(2)-->Gly, Pro(7)-->Ala, Phe(8)-->Pro). Bolus intra-arterial injections of synthetic lungfish BK (1-1000 pmol/kg body wt.) into unanaesthetised, juvenile lungfish (n=5) produced a ...
R. J. BALMENT +3 more
openaire +3 more sources
Journal of Morphology, 1986
Stratigraphical and paleoecological evidence indicates that lungfishes evolved in shallow marine conditions. Devonian genera had large gill chambers, and the details of bony supports of the gill arches of the Late Devonian Griphognathus whitei demonstrate that the arches were all functional.
K. S. W. Campbell, R. E. Barwick
openaire +1 more source
Stratigraphical and paleoecological evidence indicates that lungfishes evolved in shallow marine conditions. Devonian genera had large gill chambers, and the details of bony supports of the gill arches of the Late Devonian Griphognathus whitei demonstrate that the arches were all functional.
K. S. W. Campbell, R. E. Barwick
openaire +1 more source
Molecular Cloning of Lungfish Proopiomelanocortin cDNA
General and Comparative Endocrinology, 1999To investigate the evolution of proopiomelanocortin (POMC) from fish to tetrapods, nucleotide sequence of POMC cDNA from a lobe-finned fish, the African lungfish, was determined. POMC cDNA was prepared from lungfish pituitary glands. The POMC cDNA is composed of 1114 bp, excluding a poly-A tail, and encodes 255 amino acids (aa) including a signal ...
Y, Amemiya +3 more
openaire +2 more sources
Microscopy Research and Technique, 2002
AbstractLungfish are a group of ancient fish, represented almost continuously in the fossil record from their first appearance in the Devonian to the present time. They have numerous unique characters in the dentition, found only among lungfish, as well as some that are shared with other groups of fish and with higher vertebrates, such as a thin layer ...
openaire +3 more sources
AbstractLungfish are a group of ancient fish, represented almost continuously in the fossil record from their first appearance in the Devonian to the present time. They have numerous unique characters in the dentition, found only among lungfish, as well as some that are shared with other groups of fish and with higher vertebrates, such as a thin layer ...
openaire +3 more sources
Lungfish evolution and development
General and Comparative Endocrinology, 2006The first vertebrates recognizable as tetrapods appeared in the mid-Devonian. It is generally agreed that their ancestors were lobe-finned fish. What is not agreed is how close either of the extant groups of lobe-finned fish, lungfish or coelacanths, is to the actual ancestor of the tetrapods.
openaire +2 more sources
Lungfish prolactin exhibits close tetrapod relationships
Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology, 1993This paper describes the isolation and the complete amino-acid sequence of prolactin (PRL) from the pituitary glands of African lungfish, Protoputerus aethiopicus. We purified the hormone from an alkaline extract of the pituitaries using a two-step chromatographic procedure by detecting specific immunoblot reactivity with rabbit antisera against salmon
T, Noso, C S, Nicoll, H, Kawauchi
openaire +2 more sources
The remarkable lungfish otolith
New Zealand Journal of Marine and Freshwater Research, 1986Abstract Otoliths and macula from the Australian lungfish Neoceratodus forsteri were examined by light and scanning electron microscopy. The otoliths, corresponding to the sagitta and lapillus in teleosts, were found to consist of crystalline oto‐conia consisting of calcite, aragonite, and a previously undescribed form of calcium carbonate bound in ...
R. W. Gauldie +2 more
openaire +1 more source