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  • Insect sensilla  (2)
  • Taste hairs  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Chemosensory control of pollen ingestion in the hoverfly Eristalis tenax by labellar taste hairs (2000)
    Springer
    Journal of comparative physiology 186 (2000), S. 193-203 
    Details
    ISSN: 1432-1351
    Keywords: Key wordsEristalis tenax ; Pollen ; Taste hairs ; Contact chemoreception ; Proline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The labellar gustatory system of the dronefly Eristalis tenax L. (Syrphidae; Diptera) that enables the fly to discriminate between pollen and nectar is investigated, and the triggering of pollen ingestion is examined. In behavioural preference tests, exhaustively extracted pollen of the sunflower Helianthus annuus is consumed in smaller amounts than untreated pollen, indicating that water-soluble substances are important for acceptance. Dry pollen is preferred over moist pollen in which the grains stick together, suggesting that mechanical properties of the pollen also play a role in its sensory assessment. Electrophysiological studies of the labellar taste hairs reveal that aqueous extracts of pollen (2% w/v) stimulate the salt receptor cell, but not the sugar receptor cell. The response of the water receptor cell remains the same as to pure water (or standard electrolyte, 10 mmol · l−1 KCl). Of the 20 amino acids tested, the salt cell is sensitive only to proline in a submillimolar range. Behavioural experiments support the electrophysiological findings. When KCl is applied at concentrations eliciting salt-cell spike frequencies equal to those produced by pollen extract (which is often accepted), the water receptor cell is inhibited and a pronounced rejection behaviour occurs. This rejection of concentrated salt solution in Eristalis is therefore mainly mediated by the inhibition of the water cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050019
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanorezeptive Strukturen der antennalen Haarsensillen der Baumwollwanze Dysdercus intermedius Dist. (1972)
    Springer
    Cell & tissue research 132 (1972), S. 79-94 
    Details
    ISSN: 1432-0878
    Keywords: Insect sensilla ; Mechanoreceptors ; Tubular body ; Stimulus-conducting structures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Mechanorezeptorzellen der Tast- und Schmeckhaare auf der Antenne der Baumwollwanze besitzen einen tubulären Körper (TK), dessen Mikrotubuli an der Peripherie eine palisadenartig dichte (Abstand 100–200 Å) und im Zentrum eine annähernd hexagonale Anordnung (Abstand 300 Å) zeigen. Zwischen den peripheren Tubuli und der Dendritenmembran bestehen Brücken. Die Mikrotubuli sind durch senkrecht zu ihrer Achse orientierte Schichten elektronendichten Materials (Dicke und Abstand je 170 Å) verbunden. Proximal vom TK ist die Zahl der Tubuli stark reduziert. Im Sockelbereich beider Haartypen finden sich hebelartige Verlängerungen des Haarschafts, die dessen Auslenkung in eine Kompression des TK transformieren. Eine Beteiligung der Mikrotubuli des TK an der Reiz-Erregungs-Transduktion wird diskutiert.
    Notes: Summary Mechanoreceptor cells of the touch- and taste hairs on the antenna of the red cotton bug possess a tubular body (TB). The TB contains microtubuli, which are 100–200 Å apart and arranged on palisades in the peripheral part of the TB, and about 300 Å apart and hexagonally arranged in the central part of the TB. Bridges (filaments) exist between the peripheral tubuli and the membrane of the dendrite. The microtubuli are connected by layers of dense material (of 170 Å thickness and distance) which are arranged perpendicularly to their axes. Proximal to the TB the number of the microtubuli is strongly reduced. In the joint region of both hair types the hairshafts show lever-like processes which transmit the bending effect of the hair into a compression of the TB. The role of the microtubuli in this transduction is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310298
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  • 3
    Electronic Resource
    Electronic Resource
    Die Feinstruktur der tarsalen Schmeckhaare der Fliege Phormia terraenovae Rob.-Desv. (1971)
    Springer
    Cell & tissue research 117 (1971), S. 419-442 
    Details
    ISSN: 1432-0878
    Keywords: Taste hairs ; Insects ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Schmeckhaare der Fliege Phormia terraenovae enthalten fünf Rezeptorzellen (vier Kontaktchemo- und eine Mechanorezeptorzelle), die von zwei Hüllzellen unter Aussparung von Lymphräumen („Vakuole“) umgeben sind. Die Rezeptorzellen gliedern sich in Axon, Zellkörper und Dendrit, der aus Innenglied, Übergangsabschnitt und Außenglied besteht. Der Übergangsabschnitt hat die 9+0-Struktur der modifizierten Cilien mit zwei Basalkörpern. Im Plasma der Außenglieder sind nur Mikrotubuli zu erkennen. Die Außenglieder der Kontaktchemorezeptoren ziehen durch die röhrenförmige Dendritenscheide und den Kanal I des Haarschafts bis zu einem Porus in der Haarspitze, durch den sie mit den Schmeckstoffen in Kontakt kommen (Ort der Primärprozesse). Das Außenglied der Mechanorezeptorzelle enthält einen tubulären Körper und setzt an der Haarbasis an. Die Hüllzelle II (tormogene Zelle) bildet zum großen Sensillenlymphraum hin ein stark gefaltetes Membransystem aus. Der Feinbau wird in Beziehung zur Funktion der Schmeckhaare gesetzt.
    Notes: Summary The tarsal taste hairs of the blowfly contain five receptor cells: four contact chemoreceptors and one mechanoreceptor. These cells are surrounded concentrically by two sheath cells with fluid-filled spaces (“vacuoles”) between them. The receptor cell parts are the axon, the cell body, and the dendrite. The latter has an inner segment, a transitional region, and an outer segment. The transitional region shows the 9+0 configuration of a modified cilium with two basal bodies. In the outer segment only microtubules are found. The outer segments of contact chemoreceptors pass through the tube-like dendrite sheath, then through “canal I” of the hair shaft, to reach the pore at the tip of the hair. The outer segment of the mechanoreceptor contains a “tubular body” and terminates at the hair base. The “sheath cell II” (tormogene cell) forms a folded membrane system toward the main liquor space. The fine structure of the tarsal taste hairs is discussed in relation to their function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324812
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Single-pore sensilla of damselfly-larvae: Representatives of phylogenetically old contact chemoreceptors? (1980)
    Springer
    Cell & tissue research 207 (1980), S. 307-320 
    Details
    ISSN: 1432-0878
    Keywords: Insect sensilla ; Fine structure ; Odonata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die vier Porensensillen des Maxillarpalpus von Agrion and Ischnura besitzen zwei (Sensillum Typ A), beziehungsweise fünf (Sensillum Typ B) bipolare Rezeptorzellen. Distal werden ihre Dendriten von der Dendritenscheide und dem Porusrohr umschlossen. Die Dendriteninnenglieder inserieren seitlich an den Perikarya. Die Rezeptorzellen jedes Sensillums sind von drei Hüllzellen und drei voneinander getrennten Rezeptorlymphräumen umschlossen. Rezeptorlymphraum l und 3 haben durch das Porusrohr, beziehungsweise durch das Porenkanalsystem der Cuticula Verbindung nach außen. Alle drei Hüllzellen zeigen apikal mikrovillusartige Membranstrukturen; außerdem besitzen sie je zwei Centriolen in Tandemstellung. Die Feinstruktur der Porensensillen wird mit der ähnlicher Arthropodensensillen verglichen. Funktionelle und phylogenetische Aspekte werden diskutiert.
    Notes: Summary The four single-pore sensilla on the maxillary palp of Agrion and Ischnura possess two bipolar sensory cells for A-sensilla and five for B-sensilla. Distally, their dendrites are enclosed by a dendritic sheath and a pore tube. The dendritic tips have access to the outside via the opening of the pore tube. The inner dendritic segments join the receptor cell bodies laterally. The receptor cells of each sensillum are enveloped by three sheath cells and three receptor lymph cavities. Receptor lymph cavity 1 and 3 are connected with the outside by the pore tube and a minute canal system in the cuticle, respectively. All three sheath cells show microvilluslike processes of the apical membrane. Moreover, all sheath cells contain two centrioles in tandem arrangement. The structure of the single-pore sensilla is compared with that of similar sensilla of other arthropods. Functional and phylogenetic aspects are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237814
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    Paper (German National Licenses)
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