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Nitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata)

dc.contributor.authorSartori, M. R.
dc.contributor.authorTaylor, E. W.
dc.contributor.authorAbe, Augusto Shinya [UNESP]
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniv. of Birmingham
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:27:03Z
dc.date.available2014-05-27T11:27:03Z
dc.date.issued2012-10-01
dc.description.abstractDevelopment 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.en
dc.description.affiliationDepartment of General Physiology University of São Paulo, 05508-900 São Paulo
dc.description.affiliationSchool of Biosciences Univ. of Birmingham, B15 2TT Birmingham
dc.description.affiliationDepartment of Zoology University of São Paulo State, 13506-900 Rio Claro, SP
dc.format.extent210-214
dc.identifierhttp://dx.doi.org/10.1016/j.cbpa.2012.06.004
dc.identifier.citationComparative Biochemistry and Physiology - A Molecular and Integrative Physiology, v. 163, n. 2, p. 210-214, 2012.
dc.identifier.doi10.1016/j.cbpa.2012.06.004
dc.identifier.file2-s2.0-84864104055.pdf
dc.identifier.issn1095-6433
dc.identifier.issn1531-4332
dc.identifier.lattes8776757457144680
dc.identifier.scopus2-s2.0-84864104055
dc.identifier.urihttp://hdl.handle.net/11449/73605
dc.language.isoeng
dc.relation.ispartofComparative Biochemistry and Physiology - A Molecular and Integrative Physiology
dc.relation.ispartofjcr2.258
dc.relation.ispartofsjr0,836
dc.relation.ispartofsjr0,836
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectDevelopment
dc.subjectEmbryo
dc.subjectExcretion
dc.subjectIguana
dc.subjectUrea
dc.subjectammonia
dc.subjectnitrogen
dc.subjecturea
dc.subjecturic acid
dc.subjectamnion fluid
dc.subjectegg
dc.subjectembryo
dc.subjectembryo development
dc.subjectfetus membrane
dc.subjectIguana iguana
dc.subjectnitrogen urine level
dc.subjectnonhuman
dc.subjectreptile
dc.subjectAmmonia
dc.subjectAnalysis of Variance
dc.subjectAnimals
dc.subjectIguanas
dc.subjectNitrogen
dc.subjectOvum
dc.subjectUric Acid
dc.subjectYolk Sac
dc.subjectAves
dc.subjectReptilia
dc.subjectSquamata
dc.titleNitrogen excretion during embryonic development of the green iguana, Iguana iguana (Reptilia; Squamata)en
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dspace.entity.typePublication
unesp.author.lattes8776757457144680[3]
unesp.author.orcid0000-0002-6765-8726[3]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Rio Claropt
unesp.departmentZoologia - IBpt

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