Results 121 to 130 of about 1,771 (171)
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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,
R. W. Gauldie +2 more
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Nature Reviews Genetics, 2021
Two new studies report the assembled genomes of the Australian lungfish (Neoceratodus forsteri) and the African lungfish (Protopterus annectens), which provide insights into the water-to-land transition.
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Two new studies report the assembled genomes of the Australian lungfish (Neoceratodus forsteri) and the African lungfish (Protopterus annectens), which provide insights into the water-to-land transition.
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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
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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
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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
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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
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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
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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
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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 ...
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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 ...
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Nitrogen metabolism in the African lungfish
Comparative Biochemistry and Physiology, 1968Abstract 1. 1. The free amino acid concentration and glutamate dehydrogenase (GDH) activity were similar in livers of unfed and estivating African lungfish. 2. 2. Glutamine synthetase was present in brain but undetectable in liver. 3. 3. Lungfish GDH was kinetically similar to amphibian GDH. 4. 4.
P A, Janssens, P P, Cohen
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Journal of Morphology, 1986
Problems surrounding the relationships of lungfishes are intricately connected with the search for the origin of tetrapods. Early in the history of lungfish research, the emphasis was on attempts to determine whether lungfishes were more closely related to fishes or to tetrapods.
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Problems surrounding the relationships of lungfishes are intricately connected with the search for the origin of tetrapods. Early in the history of lungfish research, the emphasis was on attempts to determine whether lungfishes were more closely related to fishes or to tetrapods.
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Current Biology
Alice Clement introduces the lungfishes, a group of sarcopterygian fishes that uses lungs to breathe and is the living sister group to tetrapod vertebrates.
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Alice Clement introduces the lungfishes, a group of sarcopterygian fishes that uses lungs to breathe and is the living sister group to tetrapod vertebrates.
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Cardiovascular dynamics in the lungfishes
Zeitschrift für vergleichende Physiologie, 19681. Cardiovascular dynamics and the functional status of a double circulation have been studied in representatives of the three genera of lungfishes; Neoceratodus, Lepidosiren, and Protopterus. 2. The experimental approach consisted in continuous recording of heart rate, blood pressures and blood velocity from appropriate blood vessels in
Kjell Johansen +2 more
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