1,721,037 research outputs found
OBSERVATIONS ON THE MORPHOGENESIS OF OTOLITHS DURING LARVAL DEVELOPMENT IN BROOK LAMPREY, LAMPETRA PLANERI,
No full textSTUDI SUL LABIRINTO MEMBRANOSO DURANTE LO SVILUPPO LARVALE NELLA LAMPREDA DI RUSCELLO LAMPETRA PLANERI (LINNAEUS, 1758) (CICLOSTOSTUDI SUL LABIRINTO MEMBRANOSO DURANTE LO SVILUPPO LARVALE NELLA LAMPREDA DI RUSCELLO LAMPETRA PLANERI (LINNAEUS, 1758) (CICLOSTOMATA, PETROMYZONIDAE)
No full textIL LABIRINTO MEMBRANOSO DURANTE LO SVILUPPO LARVALE E NELLADULTO DELLA LAMPREDA DI RUSCELLO LAMPETRA PLANERI (LINNAEUS, 1758) (CICLOSTOMATA, PETROMYZONIDAE)
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Development of the ampullae in the semicircular canals of chick embryos: A scanning and transmission electron microscopy investigation.
No full textOur scanning ultrastructural studies in chick embryos revealed that the early bud (7days embryo) of the septum cruciatum (s.c.) is represented by bulges of both sites of the central portion of the crista, that thus takes the shape of a spindle. During the following stages these buds become small roundish swelling that progressively grow thinner and elongate. In 1-and 4 day chickens, they display lateral depressions and cluster of microvilli that make the septum resemble the cladode of Opuntia vulgaris. From the 8th day, tufts of hairs appear on the crista, including a longer kinocilium and a bundle of stereocilia decreasing in height. In the vertical semicircular canals, the central portion of the crista on the area included between the two protrusions of the s.c. is hairless and clepsydra –shaped. During the early stages studied, transmission electron microscopy observations have shown differentiated sensorial cells of type I and II according to Wersall and the respective cytoneural synapses.The supporting cells, instead, are not yet well differentiated. On the 14th day, some cells show a darker cytoplasmic matrix and evident infolding of the basal and lateral plasmalemma delimiting compartments with numerous mitochondria. These features become more marked during the following days, and after birth dark cells resemble those of adults.Stress is laid on the mismatch between the early differentiation of ampullar receptors and the late one of dark cells, as well as on its possible significance
Immunocytochemistry of carbonic anhydrase in the chick embryo membranous labyrinth during development.
No full textImmunocytochemistry of carbonic anhydrase and non-radioactive detection of its RNA by in situ hybridization in the chick embryo membranous labyrinth
No full textImmunocytochemical observations of carbonic anhydrase in the membranous labyrinth during development
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