MORPHOLOGICAL VARIATIONS CAUSED BY FIXATION TECHNIQUES MAY LEAD TO TAXONOMIC CONFUSION IN LAEONEREIS (POLYCHAETA: NEREIDIDAE)

Morphological variations caused by fixation techniques may lead to taxonomic confusion in Laeonereis (Polychaeta: Nereididae)

The nereidid polychaete Laeonereis acuta (Treadwell, 1923) is either considered to be a valid species, or a synonym of Laeonereis culveri (Webster, 1879).The species epithet, acuta, refers to the acuminate anterior region of the body followed by a widening that is visible up to the 10th setiger.The relative width of the anterior region of the body,

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Sociobiological control of plasmid copy number in bacteria.

All genes critical for plasmid replication regulation are located on the plasmid rather than on the host chromosome.It is possible therefore that there can be copy-up "cheater" mutants.In spite of this possibility, low copy number plasmids appear to exist stably in host populations.We examined this paradox using a multilevel selection model.Simulat

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A Plea for Concrete Universals

This paper is concerned with the metaphysics of created repeatable objects, such as musical works and literary fictions.In section 2 we lay out what we take to be intuitive and plausible desiderata for any theory of created repeatable objects.In sections 3 and 4 we proceed with an extended disjunctive Medium Format Lens syllogism.Created repeatable

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