{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19267"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19267","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Limb and thoracic segments of crayfish contain the same segmental field","abstract":"Made available in DSpace on 2011-05-07T12:02:12Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9124493.pdf: 6933819 bytes, checksum: 7a094fe79479328e0d51e5880b0c5af8 (MD5) Previous issue date: 1991","abstract_html":"Made available in DSpace on 2011-05-07T12:02:12Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9124493.pdf: 6933819 bytes, checksum: 7a094fe79479328e0d51e5880b0c5af8 (MD5) Previous issue date: 1991","abstract_has_math":false,"creators":["Sturtevant, Mark Alan"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Entomology","degree_department":null,"school":null,"contributors":["Mittenthal, Jay E."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:02:12Z","date_published":"2011-05-07T12:02:12Z","updated_at":"2026-07-22T22:25:12Z","subjects":["Biology, Animal Physiology","Biology, Zoology"],"languages":["eng"],"rights":["Copyright 1991 Sturtevant, Mark Alan"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9124493","(UMI)AAI9124493"],"render_values":[{"text":"AAI9124493","href":null,"code":true},{"text":"(UMI)AAI9124493","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19267","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Mittenthal, Jay E."]},{"key":"dc:creator","label":"Author","values":["Sturtevant, Mark Alan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:02:12Z","10000-01-01","1991"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Entomology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Biology, Animal Physiology","Biology, Zoology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1991 Sturtevant, Mark Alan"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9124493","(UMI)AAI9124493","http://hdl.handle.net/2142/19267"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Made available in DSpace on 2011-05-07T12:02:12Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9124493.pdf: 6933819 bytes, checksum: 7a094fe79479328e0d51e5880b0c5af8 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:35:47Z Item is restricted indefinitely.","The segmented appendages of arthropods are constructed by different types of morphogenetic fields. A long-range field system, called the limb field, promotes continuity for a normally segmented appendage. The control of this continuity also appears to extend onto the nearby body wall. Limb segmental fields act to ensure local positional continuity within a segment, and they are equivalent in the different segments of a leg. As an overview of these principles in crayfish, distal segments of a leg were grafted into the most proximal segment, the coxa. The presence of both field mechanisms was evident during the subsequent intercalary reconstruction of the leg. A jointed intercalate was the hallmark of limb field activity; intrasegmental fusion between matching areas of different segments was the hallmark of limb segmental fields. The principle of limb/body continuity is discussed; its limitation was assessed in crayfish with an operation that provoked extensive intercalary regeneration of legs from ectopic positions in the body.","Several operations were done to test if limb/body continuity includes subcoxa limb segmental fields incorporated into the thoracic body wall proximal to the coxa. Large coxa grafts into a leg site, and patch grafts between coxa and body wall, were used to test the 'subcoxa theory' in crayfish. A distinctive pattern of intrasegmental fusions between the coxa and body wall was found, and so subcoxa limb segmental fields exist in different thoracic body segments proximal to each coxa segmental field. The most unusual feature was that the pattern of fusions indicated that the subcoxa field maps are proximo-distally mirror symmetric to the more distal segmental fields of a leg. The more distal leg segments in crayfish and insects embody tandemly symmetric segmental fields. The finding of subcoxa limb segmental fields in crayfish is discussed in the context of possible mechanisms of arthropod leg development and evolution.","Restriction data tranferred 2014-07-01T11:14:14-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Limb and thoracic segments of crayfish contain the same segmental field"]}]}],"canonical_facts":{"dc:contributor":["Mittenthal, Jay E."],"dc:creator":["Sturtevant, Mark Alan"],"dc:date":["2011-05-07T12:02:12Z","10000-01-01","1991"],"dc:description":["Made available in DSpace on 2011-05-07T12:02:12Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9124493.pdf: 6933819 bytes, checksum: 7a094fe79479328e0d51e5880b0c5af8 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:35:47Z Item is restricted indefinitely.","The segmented appendages of arthropods are constructed by different types of morphogenetic fields. A long-range field system, called the limb field, promotes continuity for a normally segmented appendage. The control of this continuity also appears to extend onto the nearby body wall. Limb segmental fields act to ensure local positional continuity within a segment, and they are equivalent in the different segments of a leg. As an overview of these principles in crayfish, distal segments of a leg were grafted into the most proximal segment, the coxa. The presence of both field mechanisms was evident during the subsequent intercalary reconstruction of the leg. A jointed intercalate was the hallmark of limb field activity; intrasegmental fusion between matching areas of different segments was the hallmark of limb segmental fields. The principle of limb/body continuity is discussed; its limitation was assessed in crayfish with an operation that provoked extensive intercalary regeneration of legs from ectopic positions in the body.","Several operations were done to test if limb/body continuity includes subcoxa limb segmental fields incorporated into the thoracic body wall proximal to the coxa. Large coxa grafts into a leg site, and patch grafts between coxa and body wall, were used to test the 'subcoxa theory' in crayfish. A distinctive pattern of intrasegmental fusions between the coxa and body wall was found, and so subcoxa limb segmental fields exist in different thoracic body segments proximal to each coxa segmental field. The most unusual feature was that the pattern of fusions indicated that the subcoxa field maps are proximo-distally mirror symmetric to the more distal segmental fields of a leg. The more distal leg segments in crayfish and insects embody tandemly symmetric segmental fields. The finding of subcoxa limb segmental fields in crayfish is discussed in the context of possible mechanisms of arthropod leg development and evolution.","Restriction data tranferred 2014-07-01T11:14:14-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9124493","(UMI)AAI9124493","http://hdl.handle.net/2142/19267"],"dc:language":["eng"],"dc:rights":["Copyright 1991 Sturtevant, Mark Alan"],"dc:subject":["Biology, Animal Physiology","Biology, Zoology"],"dc:title":["Limb and thoracic segments of crayfish contain the same segmental field"],"dc:type":["text"],"thesis:degree_discipline":["Entomology"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:12Z"}