The Experts below are selected from a list of 11160 Experts worldwide ranked by ideXlab platform
G D Lange - One of the best experts on this subject based on the ideXlab platform.
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ampullary Sense Organs peripheral central and behavioral electroreception in chimeras hydrolagus holocephali chondrichthyes part 1 of 2
Brain Behavior and Evolution, 1993Co-Authors: R D Fields, Theodore H Bullock, G D LangeAbstract:Ampullary Sense Organs are distributed in groups over the head of Hydrolagus colliei with their pores in clusters and innervated by the buccal, hyomandibular and superficial ophthal
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ampullary Sense Organs peripheral central and behavioral electroreception in chimeras hydrolagus holocephali chondrichthyes
Brain Behavior and Evolution, 1993Co-Authors: R D Fields, Theodore H Bullock, G D LangeAbstract:Ampullary Sense Organs are distributed in groups over the head of Hydrolagus colliei with their pores in clusters and innervated by the buccal, hyomandibular and superficial ophthal
Veronica Rodrigues - One of the best experts on this subject based on the ideXlab platform.
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combinatorial expression of prospero seven up and elav identifies progenitor cell types during Sense organ differentiation in the drosophila antenna
Developmental Biology, 2003Co-Authors: Anindya Sen, Veronica Rodrigues, Venugopala G ReddyAbstract:The Drosophila antenna has a diversity of chemosensory Organs within a single epidermal field. We have some idea from recent studies of how the three broad categories of Sense-Organs are specified at the level of progenitor choice. However, little is known about how cell fates within single Sense-Organs are specified. Selection of individual primary olfactory progenitors is followed by organization of groups of secondary progenitors, which divide in a specific order to form a differentiated sensillum. The combinatorial expression of Prospero Elav, and Seven-up allows us to distinguish three secondary progenitor fates. The lineages of these cells have been established by clonal analysis and marker distribution following mitosis. High Notch signaling and the exclusion of these markers identifies PIIa; this cell gives rise to the shaft and socket. The sheath/neuron lineage progenitor PIIb, expresses all three markers; upon division, Prospero asymmetrically segregates to the sheath cell. In the coeloconica, PIIb undergoes an additional division to produce glia. PIIc is present in multiinnervated Sense-Organs and divides to form neurons. An understanding of the lineage and development of olfactory Sense-Organs provides a handle for the analysis of how olfactory neurons acquire distinct terminal fates.
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atonal is a proneural gene for a subset of olfactory Sense Organs in drosophila
Genes to Cells, 1997Co-Authors: Bhagwati P Gupta, Veronica RodriguesAbstract:Background: The antenna of the adult fruit fly, Drosophila melanogaster, is covered with three morphologically distinct types of olfactory Sense Organs. In addition, mechano- and hygro-sensitive receptors are also present on its surface. While much has been learnt about the development of peripheral nervous system in Drosophila, the mechanisms underlying the development of olfactory sensilla are just beginning to be unraveled. The antennal Sense Organs have several properties that make them distinct from other Sense Organs. While each sensillum type is arranged in a well-defined region of the antenna, the position of an individual sensillum is not fixed. The development of these Sense Organs appears to combine an initial step of cell recruitment, as in photoreceptors, followed by cell lineage mechanisms, as in the development of other external Sense Organs. The earliest step in development, the selection of a sensory organ precursor, involves the interaction of proneural and neurogenic genes. The proneural gene for the antennal Sense Organs has been elusive so far. Results: We show that the basic helix-loop-helix (bHLH) transcription factor encoded by atonal (ato) is a proneural gene for one morphological type of olfactory sensilla on the antenna and for all the olfactory sensilla on the maxillary palp. Loss of function and overexpression experiments together reveal that ato is both necessary and sufficient to specify these sensilla. Immunohistochemical experiments show that Ato expresses in a dynamic pattern in the developing antennal disc. Conclusions: Our results demonstrate that ato acts solely in the specification of antennal sensilla coeloconica. This along with our previous observation that the AS-C genes do not function in antenna allows us to suggest that other proneural genes must operate in the specification of sensilla basiconica and trichoidea. Our experiment involving overexpression of extramacrochaetae, a negative regulator of bHLH encoding genes, results in a significant reduction in the number of all three types of antennal sensilla. This suggests that the unidentified proneural gene(s) possibly encode bHLH factors.
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development of the drosophila olfactory Sense Organs utilizes cell cell interactions as well as lineage
Development, 1997Co-Authors: G. V. Reddy, Bhagwati P Gupta, Veronica RodriguesAbstract:We have examined the mechanisms underlying the development of the olfactory Sense Organs on the third segment of the antenna of Drosophila. Our studies suggest that a novel developmental strategy is employed. Specification of the founder or precursor cell is not governed by the genes of the achaete-scute complex. Another basic helix-loop-helix encoding gene, atonal, is essential for determination of only a subset of the sensilla types--the sensilla coeloconica. Therefore, we predict the existence of additional proneural genes for the selection of sensilla trichoidea and sensilla basiconica. The choice of a founder cell from the presumed proneural domain is regulated by Notch activity. Soon after delamination of the founder cell, two to three additional neighboring cells also take on a sensory fate and these cells together form a presensillum cluster. The selection of neighbors does not occur when endocytosis is blocked using a temperature sensitive allele of shibire, thus suggesting that cell-cell communication is required for this step. The cells of the cluster divide once before terminal differentiation which is influenced by Notch activity. The final cell number within each sensillum is controlled by programmed cell death.
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cellular events during development of the olfactory Sense Organs in drosophila melanogaster
Developmental Biology, 1995Co-Authors: Veronica RodriguesAbstract:Abstract The olfactory sensilla on the antenna of adult Drosophila melanogaster develop during the first 36 hr after pupariation, from their anlagen in the cephalic disc. We have used tissue-specific β-galactosidase expression in the enhancer trap strain A101.IF3 and the monoclonal antibody 22C10 as sensory cell markers, as well as the lineage tracer 5-bromo-2′-deoxyuridine (BrdU), to describe this process. The development of an olfactory sensillum begins with the selection of a "founder cell" (FC). These cells are distinct in that they possess large apically located nuclei revealed by β-galactosidase expression in A101.IF3. In the following 6 hr, a few cells neighboring the FC also start expressing β-galactosidase and together comprise a group. Cells of this group, denoted a "presensillum-cluster" (PSC), undergo at least one round of replication and give rise to all of the cells of a sensillum. A subset of the cells within each PSC and, later, all the sensory neurons are recognized by MAb22C10. The antennae of the mutant lozenge 3 ( lz 3 ) lack all basiconic and some trichoid sensilla. The mutation apparently affects early steps in sensillum development and many of the FCs fail to form. Those that are present, however, proceed to form mature olfactory sensilla. Therefore, we conclude that the selection of an FC is the first step in olfactory Sense organ development. Our study reveals novel aspects of sensory development in Drosophila .
R D Fields - One of the best experts on this subject based on the ideXlab platform.
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ampullary Sense Organs peripheral central and behavioral electroreception in chimeras hydrolagus holocephali chondrichthyes part 1 of 2
Brain Behavior and Evolution, 1993Co-Authors: R D Fields, Theodore H Bullock, G D LangeAbstract:Ampullary Sense Organs are distributed in groups over the head of Hydrolagus colliei with their pores in clusters and innervated by the buccal, hyomandibular and superficial ophthal
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ampullary Sense Organs peripheral central and behavioral electroreception in chimeras hydrolagus holocephali chondrichthyes
Brain Behavior and Evolution, 1993Co-Authors: R D Fields, Theodore H Bullock, G D LangeAbstract:Ampullary Sense Organs are distributed in groups over the head of Hydrolagus colliei with their pores in clusters and innervated by the buccal, hyomandibular and superficial ophthal
Theodore H Bullock - One of the best experts on this subject based on the ideXlab platform.
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ampullary Sense Organs peripheral central and behavioral electroreception in chimeras hydrolagus holocephali chondrichthyes part 1 of 2
Brain Behavior and Evolution, 1993Co-Authors: R D Fields, Theodore H Bullock, G D LangeAbstract:Ampullary Sense Organs are distributed in groups over the head of Hydrolagus colliei with their pores in clusters and innervated by the buccal, hyomandibular and superficial ophthal
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ampullary Sense Organs peripheral central and behavioral electroreception in chimeras hydrolagus holocephali chondrichthyes
Brain Behavior and Evolution, 1993Co-Authors: R D Fields, Theodore H Bullock, G D LangeAbstract:Ampullary Sense Organs are distributed in groups over the head of Hydrolagus colliei with their pores in clusters and innervated by the buccal, hyomandibular and superficial ophthal
Fred Delcomyn - One of the best experts on this subject based on the ideXlab platform.
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from insect Sense Organs to biomimetic walking robots exploratory dsp
IEEE Signal Processing Magazine, 2008Co-Authors: Fred DelcomynAbstract:In this article, we have pointed out several features of the sensory systems of insects that help these animals control their extraordinarily adaptable and agile locomotion on land. These impressive but often counterintuitive features allow the effects of sensory input to be adjusted continually according to the activity in which the insect is actively engaged, in contrast with hardwired reflexes that must be overcome as the animal switches from one activity to another. The pertinent question is how engineers can incorporate these and other features of biological systems into walking robots.
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Sense Organs of insect legs and the selection of sensors for agile walking robots
The International Journal of Robotics Research, 1996Co-Authors: Fred Delcomyn, Mark E. Nelson, J.h. Cocatre-zilgienAbstract:Legged robots modeled after insects have been proposed for use on rugged, dangerous, or inaccessible terrain. The agility of current hexapod robots, however, is not yet as good as that of their biological counterparts. The capability of insects for agile locomotion is likely due mainly to the rich variety of sensory information that is provided by Sense Organs in their legs. In this article we review the characteristics and distri bution of insect leg Sense Organs in terms that are relevant to researchers interested in designing agile, insect-like, walking robots, In insect locomotion, three classes of mechanosensory Organs seem to play an important role in sensory feedback: detectors of leg movement, detectors of external contact, and detectors of leg stress. We review the properties of these types of Sense Organs and describe their functional roles in the con trol of locomotion.
