= Eiko Yabuuchi
{c}
= E. Yabuuchi
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{synonym}
<Eiko Yabuuchi> is a <microbiologist> credited with comparative bacterial <taxonomy (biology)>. Her full name appears in the original 1990 publication proposing <Sphingomonas> as a <taxonomic genus>, establishing the identity behind the indexed E. Yabuuchi byline.<Sphingomonas genus and species proposals by E. Yabuuchi and others>[Original J-STAGE and publisher full author lists; 1990 affiliation]{ref}
The proposal combined different kinds of molecular evidence: partial <16S ribosomal RNA> sequences, characteristic <sphingoglycolipids> in cellular lipids, and the major <ubiquinone> type. Further DNA comparisons and observed traits supported distinctions among species. The resulting taxonomic argument concerned relationships and diagnostic properties, not just resemblance in cell shape.<Sphingomonas genus and species proposals by E. Yabuuchi and others>[Abstract, sequence comparisons, lipid chemistry, quinone and species distinctions]{ref}
A constructed comparison illustrates why several characters are useful. Suppose three isolates all appear as rods under a microscope. Isolates A and B share a characteristic membrane lipid and a closely related marker sequence, whereas C differs in both. The shared shape alone would group all three together; the additional observations support investigating a different arrangement. This example does not supply a universal numerical threshold for a genus or species, nor does it make any one chemical feature sufficient on its own.
Yabuuchi and collaborators also anchored their naming proposal to a <type species> and designated <type strains> for newly described species.<Sphingomonas genus and species proposals by E. Yabuuchi and others>[Abstract, Sphingomonas paucimobilis type species and named type strains]{ref} Such reference material connects a name to something that can be compared by later investigators. Taxonomic conclusions can be revised as evidence changes, while explicitly identified reference strains help make those comparisons reproducible.
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