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divergent taxa, since duplication of genes promotes functional divergence. Surveys of homeobox gene diversity in vertebrates and amphioxus reveal that many classes of homeobox genes duplicated close to vertebrate origins. This raises the question of how widespread gene duplication was during early
VITAL- UND SUPRAVITALFÄRBUNG VERSCHIEDENER ORGANE UND ORGANSYSTEME VON AMPHIOXUS LANCEOLATUS VON P. B. VAN WEEL. AUS DER ZOOLOGISCHEN STATION, NEAPEL, UND DEM INSTITUT FÜR VERGLEICHENDE PHYSIOLOGIE, UTRECHT. Mit 5 Textabbildungen (18 Einzelbildern). EINLEITUNG. Wahrend ich im Sommer 1935 die
The structural origin of the vertebrates’ paired limbs is still an unsolved problem. Historically, two hypotheses have been raised to explain the origin of vertebrate limbs: the Archipterygium Hypothesis and the Fin Fold Hypothesis. Current knowledge provides support for both ideas. In the recent years, it has been also suggested that (1) all appendages correspond to body axis duplications and (2) they are originated by the ventralization of the developmental program present in the median fins. The tail bud is also a relevant structure in the attempt to understand the origin of the vertebrates’ limbs. Due to their similarities in gene expression and general organization, both structures should be studied more closely to understand their potential evolutionary link. Interestingly, in non-vertebrate chordates such as Amphioxus, it is possible to find a tail fin that during development expresses several genes that are conserved with other vertebrates’ limbs and tails. This shared gene expression could be considered as an evidence of potential co-option of the same genetic tool kit from the tail to the extremities. This observation is congruent with the hypothesis of Axis paramorphism, which previously suggested similarities between the tail and limb buds.
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la zone d'algues de l'eulittoral de Banyuls Vie et Milieu 1954a 4 608 612 Hartmann G. Ostracodes des eaux souterraines littorales de la Mediterranee et de Majorque Vie et Milieu 1954b 4 238 253 2 Hartmann G. Les Ostracodes du sable a Amphioxus de Banyuls Vie et Milieu 1954c 4 4 648 658
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, S.J., Q.-P. CAO & D.P. STEINER, 1990. Evolution of the insulin superfamily: Cloning of a hybrid insulin/insulin-like growth factor cDNA from Amphioxus. Proc. Natl. Acad. Sci. USA 87: 9319-9323. HUMBEL, R.E., 1990. Insulin-like growth factors I and 11. Eur. J. Biochem. 190: 445-462. MAAKE, C. & M
merely to describe, their language points toward nonlinear and mutually co-constructing relationships among objective, subjective, and evolutionary/transindividual meanings. 10 Especially Informative Postinfundibular Amphioxus Hypothalamus Neuropile “It seems very pretty,” she said when she had finished
Magic Science Religion explores surprising intersections among the three meaning-making and world-making practices named in the title. Through colorful examples, the book reveals circuitous ways that social, cultural and natural systems connect, enabling real kinds of magic to operate. Among the many case studies are accounts of how an eighteenth-century actor gave his audience goosebumps; how painters, poets, and pool sharks use nonlinearity in working their magics; how the first vertebrates gained consciousness; how plants fine-tuned human color vision; and the necessarily magical element of activism that builds on the conviction that "another future is possible" while working to push self-fulfilling prophecy into political action.
Magic Science Religion explores surprising intersections among the three meaning-making and world-making practices named in the title. Through colorful examples, the book reveals circuitous ways that social, cultural and natural systems connect, enabling real kinds of magic to operate. Among the many case studies are accounts of how an eighteenth-century actor gave his audience goosebumps; how painters, poets, and pool sharks use nonlinearity in working their magics; how the first vertebrates gained consciousness; how plants fine-tuned human color vision; and the necessarily magical element of activism that builds on the conviction that "another future is possible" while working to push self-fulfilling prophecy into political action.
that have a uniform head and tail end while the trunk consists of two separate lateral halves forming a ring around the persisting yolk plug. Comparable malformations probably due to delayed gastrulation can be traced throughout the chordates from amphioxus to man, revealing a fundamental unity in