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Ontogeny Of Visual And Mechanosensory Structure And Function In Atlantic Menhaden Brevoortia Tyrannus, Dennis M. Higgs, Lee A. Fuiman
Ontogeny Of Visual And Mechanosensory Structure And Function In Atlantic Menhaden Brevoortia Tyrannus, Dennis M. Higgs, Lee A. Fuiman
Biological Sciences Publications
The importance of visual, mechanoreceptive and auditory inputs to escape responses was examined in larvae of the Atlantic menhaden (Brevoortia tyrannus) presented with a simulated predatory stimulus. Ontogenetic changes in the retina, superficial neuromasts and auditory bullae were examined in concert with behavioral trials in which sensory inputs were selectively blocked. Menhaden larvae showed a decrease in cone photoreceptor density and first developed rod photoreceptors when their total length (TL) reached 8-10 mm; they began summing photoreceptive inputs at 12-14 mm TL. Inflation of the auditory bullae was complete by 15 mm TL. The proliferation of superficial neuromasts varied depending …
Role Of Bicaudal-D In Patterning The Drosophila Egg Chamber In Mid-Oogenesis, Andrew Swan, B. Suter
Role Of Bicaudal-D In Patterning The Drosophila Egg Chamber In Mid-Oogenesis, Andrew Swan, B. Suter
Biological Sciences Publications
Skip to Next Section The Bicaudal-D (Bic-D) gene is required early in Drosophila oogenesis for the differentiation of an oocyte from one of a cluster of 16 interconnected germarial cells. To analyze the role of Bic-D later in oogenesis, we have constructed Drosophila lines in which Bic-D expression is under the control of the hsp70 promoter. In these flies, Bic-D activity can be induced early in oogenesis, allowing an oocyte to be made. Then, by shifting females to non-inducing conditions, Bic-D levels are depleted for the remainder of oogenesis. Using this system, we find that Bic-D is indeed required in …