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dc.contributor.advisor Hustert, Reinhold Prof. Dr. de
dc.contributor.author Gaaboub, Ibrahim Abdalla de
dc.date.accessioned 2012-04-16T14:56:58Z de
dc.date.available 2013-01-30T23:50:40Z de
dc.date.issued 2000-11-15 de
dc.identifier.uri http://hdl.handle.net/11858/00-1735-0000-0006-AC70-5 de
dc.format.mimetype ContentType:application/pdf Size:4.046 de
dc.language.iso eng de
dc.rights.uri http://webdoc.sub.gwdg.de/diss/copyrdiss.htm de
dc.title Neural processing of chemosensory information from the locust legs de
dc.type doctoralThesis de
dc.title.translated Motorische Antworten auf Reizung chemorezeptiver Sensomotorik bei locusta de
dc.contributor.referee Hustert, Reinhold Prof. Dr. de
dc.date.examination 2000-11-01 de
dc.subject.dnb 570 Biowissenschaften, Biologie de
dc.description.abstracteng Tarsal chemoreceptors in phytophagous insects can provide information on the chemical nature of the leaf surface, and are thus potentially important in host plant discrimination. Ovipositing Pieris brassicae, for example, drum the surface of leaves with their tarsi and tarsal chemoreceptors have been shown to respond to host-specific glucosinolates (Ma and Schoonhoven,1973). The classic work of Dethier on the blowfly, showed that chemical stimulation of the tarsi of Phormia regina led to proboscis extension, which was necessary to allow subsequent stimulation of additional chemoreceptors on the labellum and oral papillae, which finally led to drinking. This work was conducted in order to investigate the reflex of the pro and mesothoracic legs in Locusta migratoria L under control of their chemoreceptors in responses to be stimulating media. The study was conducted utilising different stimulating media namely : salt (10mM and 100mM NaCl), sugar (50mM sucrose and 50mM glucose), acid (25mM and100mMcitric acid) and alkaloid (50mM NHT) solutions, in addition to a repellent agent (10mM and 100mM quinine hydrochloride). The central projection of basiconic sensilla, canal sensilla and meshanoreceptors sensillum were studied by using neurobiotin backfilling and single cell recording. Results indicated that sensitivity of the prothoracic leg and its reflex are faster in comparison to the mesothoracic leg which could be explained by the dense spiking of the sensory neurones of the basiconic sensilla in the prothorecic ganglia controlling the prothoracic leg as compared to the spiking of the sensory neurones of the mesothoracic leg. Denser spiking of the sensory neurones of both canal and meshano sensilla in the prothoracic ganglia were also recorded in comparison to less spiking in mesothoracic ganglia . The basiconic sensilla shows responses to one or more of the tested stimulators indicating a partial specificity of basiconic sensilla . Results on the responses of motor neurones and their effect on the basiconic sensilla in relation to tested stimulus indicated that not all the motor neurones controlling the depressor muscles show similar responses. Some responded only to salt solution others only to sugars solutions, however, some responded to both stimuli at the same time. Local interneurones were also found to responded differently to stimulating media. One Local interneurones was identified for both salt(NaCl) and sugar(Glucose) solutions and a second was identified for the repellent agent (quinine hydrochloride). Based on the pervious result it could be concluded that chemoreceptors and specially basiconic sensilla on the tarsus, pro and mesothoracic legs play an essential role in identifying the nature of surrounding media which is intern translated as reflexes by the pro and mesothoracic legs. de
dc.contributor.coReferee Lakes-Harlan Reinhard Dr. de
dc.subject.topic Mathematics and Computer Science de
dc.subject.eng Contact chemoreceptor de
dc.subject.eng Meshanoreceptors sensillum de
dc.subject.eng Motor neurones de
dc.subject.eng Interneurones de
dc.subject.eng Basiconic sensilla de
dc.subject.eng Canal sensilla de
dc.subject.eng Locust de
dc.subject.eng Tarsus de
dc.subject.eng Central projection de
dc.subject.eng neurobiotin backfilling de
dc.subject.eng Locusta migratoria de
dc.subject.eng ganglia de
dc.subject.bk 42.17 Elektrophysiologie de
dc.identifier.urn urn:nbn:de:gbv:7-webdoc-878-1 de
dc.identifier.purl webdoc-878 de
dc.affiliation.institute Biologische Fakultät inkl. Psychologie de
dc.subject.gokfull WI Adaptation de
dc.subject.gokfull Allgemeine Physiologie de
dc.subject.gokfull Homoeostase de
dc.subject.gokfull Thermobiologie de
dc.identifier.ppn 32678487X

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