Results 201 to 210 of about 453,178 (226)
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Journal of the History of Biology, 2020
The concept that renders morphology a tool for phylogeny reconstruction is homology. The concept of homology is rooted in pre-evolutionary idealistic morphology. The claim that the goal of idealistic morphology was the seriability of form may sound paradoxical given that this discipline proceeded within a framework of strictly delimited types.
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The concept that renders morphology a tool for phylogeny reconstruction is homology. The concept of homology is rooted in pre-evolutionary idealistic morphology. The claim that the goal of idealistic morphology was the seriability of form may sound paradoxical given that this discipline proceeded within a framework of strictly delimited types.
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Archives of Surgery, 1980
When I have the opportunity to watch a bright young surgeon just a few years out of medical school as he casually stops his patient's heart and proceeds confidently with barely imaginable technical procedures while the patient's physiology is totally dependent on iatrogenic support, I feel like Darwin did as he looked at dinosaur bones in Patagonia ...
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When I have the opportunity to watch a bright young surgeon just a few years out of medical school as he casually stops his patient's heart and proceeds confidently with barely imaginable technical procedures while the patient's physiology is totally dependent on iatrogenic support, I feel like Darwin did as he looked at dinosaur bones in Patagonia ...
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Science, 1961 The systematic position of the small invertebrate group, Priapulida, is uncertain. In more recent publications they are classified usually as pseudocoelomates in the division Aschelminthes. A histological investigation of Priapulus caudatus , a widely distributed species, reveals the body cavity to be a coelom, its ...
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A PHYLOGENY OF THE BASIDIOMYCETES
Canadian Journal of Botany, 1955Thirteen phylogenetic principles of general or mycologicai application are presented. Adherence to these principles makes it difficult to accept any starting point for the Basidiomycetes other than a primitive ascomycete very close to Taphrina and parasitic upon ancient ferns. From the ancestral basidiomycete one line led to the rusts and another, via
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THE PHYLOGENY OF THE SALIENTIA
Biological Reviews, 1963Summary1. The essentially recent skeletal patterns of fossil Salientia indicates that the evolutionary relationships of the order must continue to be assessed on evidence obtained chiefly from a study of recent forms.2. The morphology and morphogenesis of the more important criteria employed in taxonomic analyses are described.
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Science, 1980
For the first time a single experimental approach, 16 S ribosomal RNA sequence characterization, has been used to develop an overview of phylogenetic relationships in the bacterial world. The technique permits the tracing of relationships back to the common ancestor of all extant life.
Ralph S. Tanner +18 more
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For the first time a single experimental approach, 16 S ribosomal RNA sequence characterization, has been used to develop an overview of phylogenetic relationships in the bacterial world. The technique permits the tracing of relationships back to the common ancestor of all extant life.
Ralph S. Tanner +18 more
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2003
Diatoms are among the most diverse groups of eukaryotic microorganisms and there are probably well in excess of 100,000 species (Mann and Droop 1996).The beauty and unbelievable variation of their intricately shaped and ornamented silica cell wall, called the frustule, have attracted taxonomists and naturalists alike (Round et al. 1990). More recently,
Wiebe H. C. F. Kooistra +3 more
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Diatoms are among the most diverse groups of eukaryotic microorganisms and there are probably well in excess of 100,000 species (Mann and Droop 1996).The beauty and unbelievable variation of their intricately shaped and ornamented silica cell wall, called the frustule, have attracted taxonomists and naturalists alike (Round et al. 1990). More recently,
Wiebe H. C. F. Kooistra +3 more
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2011
Publisher Summary This chapter discusses the study of living of phylogenetically ancient organisms such as insects, fish, amphibians, reptiles, and primitive mammals that give clues to the function of sleep. This phylogenetic approach toward investigating the origins of sleep has not been without controversy, and there is disagreement in the ...
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Publisher Summary This chapter discusses the study of living of phylogenetically ancient organisms such as insects, fish, amphibians, reptiles, and primitive mammals that give clues to the function of sleep. This phylogenetic approach toward investigating the origins of sleep has not been without controversy, and there is disagreement in the ...
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Journal of Theoretical Biology, 1972
Abstract t-RNA sequences have been aligned to maximize matches in corresponding positions. The sequences have subsequently been divided into two parts, the “squelette” (skeleton) and “muscle” positions. A test of homology based on the binomial approach has been developed and was applied to the “muscle” positions of t-RNA.
Jeff R. Cordeau +2 more
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Abstract t-RNA sequences have been aligned to maximize matches in corresponding positions. The sequences have subsequently been divided into two parts, the “squelette” (skeleton) and “muscle” positions. A test of homology based on the binomial approach has been developed and was applied to the “muscle” positions of t-RNA.
Jeff R. Cordeau +2 more
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Annual Review of Entomology, 1997
▪ Abstract The vitality of the phylogenetic dialogue in trichopterology, especially since 1967, is evidenced by the high quality and large number of published phylogenetic inferences concerning caddisflies and the continuing spirited exchange of opinions about some differences among those ideas. Monophyly for Trichoptera seems well argued.
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▪ Abstract The vitality of the phylogenetic dialogue in trichopterology, especially since 1967, is evidenced by the high quality and large number of published phylogenetic inferences concerning caddisflies and the continuing spirited exchange of opinions about some differences among those ideas. Monophyly for Trichoptera seems well argued.
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