Nitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata)
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.cbpa.2012.06.004 http://hdl.handle.net/11449/73605 |
Resumo: | Development within the cleidoic egg of birds and reptiles presents the embryo with the problem of accumulation of wastes from nitrogen metabolism. Ammonia derived from protein catabolism is converted into the less toxic product urea or relatively insoluble uric acid. The pattern of nitrogen excretion of the green iguana, Iguana iguana, was determined during embryonic development using samples from allantoic fluid and from the whole homogenized egg, and in hatchlings and adults using samples of blood plasma. Urea was the major excretory product over the course of embryonic development. It was found in higher concentrations in the allantoic sac, suggesting that there is a mechanism present on the allantoic membrane enabling the concentration of urea. The newly hatched iguana still produced urea while adults produced uric acid. The time course of this shift in the type of nitrogen waste was not determined but the change is likely to be related to the water relations associated with the terrestrial habit of the adult. The green iguana produces parchment-shelled eggs that double in mass during incubation due to water absorption; the eggs also accumulate 0.02. mM of urea, representing 82% of the total measured nitrogenous residues that accumulate inside the allantois. The increase in egg mass and urea concentration became significant after 55. days of incubation then were unchanged until hatching. © 2012 Elsevier Inc. |
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Nitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata)DevelopmentEmbryoExcretionIguanaUreaammonianitrogenureauric acidamnion fluideggembryoembryo developmentfetus membraneIguana iguananitrogen urine levelnonhumanreptileAmmoniaAnalysis of VarianceAnimalsIguanasNitrogenOvumUric AcidYolk SacAvesReptiliaSquamataDevelopment within the cleidoic egg of birds and reptiles presents the embryo with the problem of accumulation of wastes from nitrogen metabolism. Ammonia derived from protein catabolism is converted into the less toxic product urea or relatively insoluble uric acid. The pattern of nitrogen excretion of the green iguana, Iguana iguana, was determined during embryonic development using samples from allantoic fluid and from the whole homogenized egg, and in hatchlings and adults using samples of blood plasma. Urea was the major excretory product over the course of embryonic development. It was found in higher concentrations in the allantoic sac, suggesting that there is a mechanism present on the allantoic membrane enabling the concentration of urea. The newly hatched iguana still produced urea while adults produced uric acid. The time course of this shift in the type of nitrogen waste was not determined but the change is likely to be related to the water relations associated with the terrestrial habit of the adult. The green iguana produces parchment-shelled eggs that double in mass during incubation due to water absorption; the eggs also accumulate 0.02. mM of urea, representing 82% of the total measured nitrogenous residues that accumulate inside the allantois. The increase in egg mass and urea concentration became significant after 55. days of incubation then were unchanged until hatching. © 2012 Elsevier Inc.Department of General Physiology University of São Paulo, 05508-900 São PauloSchool of Biosciences Univ. of Birmingham, B15 2TT BirminghamDepartment of Zoology University of São Paulo State, 13506-900 Rio Claro, SPUniversidade de São Paulo (USP)Univ. of BirminghamUniversidade Estadual Paulista (Unesp)Sartori, M. R.Taylor, E. W.Abe, Augusto Shinya [UNESP]2014-05-27T11:27:03Z2014-05-27T11:27:03Z2012-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article210-214application/pdfhttp://dx.doi.org/10.1016/j.cbpa.2012.06.004Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology, v. 163, n. 2, p. 210-214, 2012.1095-64331531-4332http://hdl.handle.net/11449/7360510.1016/j.cbpa.2012.06.0042-s2.0-848641040552-s2.0-84864104055.pdf8776757457144680Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengComparative Biochemistry and Physiology - A Molecular and Integrative Physiology2.2580,8360,836info:eu-repo/semantics/openAccess2023-11-25T06:18:30Zoai:repositorio.unesp.br:11449/73605Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-11-25T06:18:30Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Nitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata) |
title |
Nitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata) |
spellingShingle |
Nitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata) Sartori, M. R. Development Embryo Excretion Iguana Urea ammonia nitrogen urea uric acid amnion fluid egg embryo embryo development fetus membrane Iguana iguana nitrogen urine level nonhuman reptile Ammonia Analysis of Variance Animals Iguanas Nitrogen Ovum Uric Acid Yolk Sac Aves Reptilia Squamata |
title_short |
Nitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata) |
title_full |
Nitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata) |
title_fullStr |
Nitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata) |
title_full_unstemmed |
Nitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata) |
title_sort |
Nitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata) |
author |
Sartori, M. R. |
author_facet |
Sartori, M. R. Taylor, E. W. Abe, Augusto Shinya [UNESP] |
author_role |
author |
author2 |
Taylor, E. W. Abe, Augusto Shinya [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Univ. of Birmingham Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Sartori, M. R. Taylor, E. W. Abe, Augusto Shinya [UNESP] |
dc.subject.por.fl_str_mv |
Development Embryo Excretion Iguana Urea ammonia nitrogen urea uric acid amnion fluid egg embryo embryo development fetus membrane Iguana iguana nitrogen urine level nonhuman reptile Ammonia Analysis of Variance Animals Iguanas Nitrogen Ovum Uric Acid Yolk Sac Aves Reptilia Squamata |
topic |
Development Embryo Excretion Iguana Urea ammonia nitrogen urea uric acid amnion fluid egg embryo embryo development fetus membrane Iguana iguana nitrogen urine level nonhuman reptile Ammonia Analysis of Variance Animals Iguanas Nitrogen Ovum Uric Acid Yolk Sac Aves Reptilia Squamata |
description |
Development within the cleidoic egg of birds and reptiles presents the embryo with the problem of accumulation of wastes from nitrogen metabolism. Ammonia derived from protein catabolism is converted into the less toxic product urea or relatively insoluble uric acid. The pattern of nitrogen excretion of the green iguana, Iguana iguana, was determined during embryonic development using samples from allantoic fluid and from the whole homogenized egg, and in hatchlings and adults using samples of blood plasma. Urea was the major excretory product over the course of embryonic development. It was found in higher concentrations in the allantoic sac, suggesting that there is a mechanism present on the allantoic membrane enabling the concentration of urea. The newly hatched iguana still produced urea while adults produced uric acid. The time course of this shift in the type of nitrogen waste was not determined but the change is likely to be related to the water relations associated with the terrestrial habit of the adult. The green iguana produces parchment-shelled eggs that double in mass during incubation due to water absorption; the eggs also accumulate 0.02. mM of urea, representing 82% of the total measured nitrogenous residues that accumulate inside the allantois. The increase in egg mass and urea concentration became significant after 55. days of incubation then were unchanged until hatching. © 2012 Elsevier Inc. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-10-01 2014-05-27T11:27:03Z 2014-05-27T11:27:03Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.cbpa.2012.06.004 Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology, v. 163, n. 2, p. 210-214, 2012. 1095-6433 1531-4332 http://hdl.handle.net/11449/73605 10.1016/j.cbpa.2012.06.004 2-s2.0-84864104055 2-s2.0-84864104055.pdf 8776757457144680 |
url |
http://dx.doi.org/10.1016/j.cbpa.2012.06.004 http://hdl.handle.net/11449/73605 |
identifier_str_mv |
Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology, v. 163, n. 2, p. 210-214, 2012. 1095-6433 1531-4332 10.1016/j.cbpa.2012.06.004 2-s2.0-84864104055 2-s2.0-84864104055.pdf 8776757457144680 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology 2.258 0,836 0,836 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
210-214 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1797789816428953600 |