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  • 1.
    Blom, Jonas
    et al.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Lilja, Clas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    A comparative study of embryonic development of some species some birds with diffrent patterns of postnatal growth2005Inngår i: Zoology, Vol. 108 (2), s. 81-95Artikkel i tidsskrift (Fagfellevurdert)
  • 2.
    Blom, Jonas
    et al.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Lilja, Clas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    A comparative study of growth, skeletal development and eggshell composition in some species of birds2004Inngår i: Journal of Zoology London. Oxford University Press, Vol. 262Artikkel i tidsskrift (Fagfellevurdert)
  • 3.
    Blom, Jonas
    et al.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Lilja, Clas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Heterochrony and the developmental origins of neonatal characteristics of precocial and altircial birds.2006Inngår i: Journal of Ornithology 147 (5), 2006Konferansepaper (Fagfellevurdert)
  • 4.
    Blom, Jonas
    et al.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Lilja, Clas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Patterning of embryonic development in birds2004Inngår i: Journal of Morphology 260, 2004Konferansepaper (Fagfellevurdert)
  • 5.
    Blom, Jonas
    et al.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Österström, Ola
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Lilja, Clas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Embryonic stages in the development of the altricial Fieldfare2006Inngår i: Journal of Orhithology. 147 (5). 139, 2006Konferansepaper (Fagfellevurdert)
  • 6. karlsson, Ola
    et al.
    Blom, Jonas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Lilja, Clas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Egg shell morphology and calcium logistics in bird2004Inngår i: Journal of Morphology 260, 2004Konferansepaper (Fagfellevurdert)
  • 7.
    Lilja, Clas
    et al.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Blom, Jonas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Developmental origins of anatomical requirements for begging behavior2006Inngår i: Journal of Ornithology 147 (5), 2006Konferansepaper (Fagfellevurdert)
  • 8.
    Lilja, Clas
    et al.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Blom, Jonas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    L Marks, Henry
    A comparative study of embryonic development of Japanese quail selected for different patterns of postnatal growth2001Inngår i: Zoology, Urban & Fischer Verlag, Vol. 104Artikkel i tidsskrift (Fagfellevurdert)
  • 9.
    Österström, Ola
    et al.
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Holm, Lena
    Lilja, Clas
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Calcium mobilization from the avian eggshell during embryonic development2013Inngår i: Animal Biology, ISSN 1570-7555, E-ISSN 1570-7563, Vol. 63, nr 1, s. 33-46Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The avian eggshell acts as the major source of calcium for embryogenesis in bird. Using scanning electron microscopy, the inner eggshell surface was analysed before and after embryonic development and its accompanying calcium removal. This was done in eggs from two bird species with different growth rates and modes of development, the precocial Japanese quail Coturnix japonica and the altricial starling Sturnus vulgaris. Next, enzyme histochemistry was used to localize carbonic anhydrase in the extra-embryonic chorioallantoic membrane to provide support for the hypothesis that calcium may be released from the eggshell by means of acidification through the action of carbonic anhydrase. However, neither in the precocial quail nor in the altricial starling could any staining for carbonic anhydrase be detected. These results lead us to the conclusion that the role of carbonic anhydrase in embryonic calcium mobilization from the avian eggshell remains unclear.

  • 10.
    Österström, Ola
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Lilja, Clas
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Carbonic anhydrase and calcium mobilization from the avian eggshell during embryonic development2010Inngår i: 25th International Ornithological Congress 22 to 28 August 2010 ISBN 978-85-911618-0-5 Campos do Jordão, SP, BRAZIL: Abstracts of the 25 International Ornithological Congress, 2010, s. 683-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The avian eggshell contributes to successful embryogenesis by acting as the major source of calcium. It has been suggested, moreover, that birds have evolved eggshells with different structures adapted to cope with different calcium requirements imposed by different growth rates and modes of development. Yet the mechanism of calcium removal from the avian eggshell by the embryo remains unknown. Using enzyme histochemistry, we here test an old hypothesis stating that calcium is released from the eggshell by means of acidification by the action of carbonic anhydrase (CA) in the extra-embryonic chorio-allantoic membrane (CAM). This enzyme catalyses the reversible reaction CO2+H2O <-> H+HCO3 and is known to take significant part in acid-base regulation in the body. We examined CAMs from two bird species, Coturnix japonica and Sturnus vulgaris, with very different growth rates and modes of development. The CAMs were examined for CA activity at the later stages of embryonic development. However, in all CAMs examined, staining for CA was absent, leading us to the conclusion that existing hypothesis about a link between CA and embryonic calcium mobilization from the avian eggshell is at present premature.

  • 11.
    Österström, Ola
    et al.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Lilja, Clas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Changes in eggshell structure and function during avian evolution2007Inngår i: Journal of Morphology 246 (12), 2007Konferansepaper (Fagfellevurdert)
  • 12.
    Österström, Ola
    et al.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Lilja, Clas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Eggshell structure, mode of development and growth rate in birds.2008Inngår i: Zoology (Jena), ISSN 0944-2006, E-ISSN 1873-2720, Vol. 111, nr 6, s. 494-502Artikkel i tidsskrift (Fagfellevurdert)
  • 13.
    Österström, Ola
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Lilja, Clas
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Evolution of avian eggshell structure.2012Inngår i: Journal of morphology (1931. Print), ISSN 0362-2525, E-ISSN 1097-4687, Vol. 273, nr 3, s. 241-247Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Data are presented suggesting that birds have evolved eggs with shells containing different structures (numbers of mammillae per unit of inner eggshell surface area, i.e., mammillary densities) to cope up with different calcium requirements imposed by different growth rates and modes of development. Precocial bird species grow slowly, but have high mammillary density, while altricial bird species grow rapidly, but have low mammillary density. These results suggest an adaptation associated with growth rate and mode of development and show, moreover, that the mammillary layer is indicative of the breeding biology of the bird.

  • 14.
    Österström, Ola
    et al.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Lilja, Clas
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Is the shell of an egg adapted to support different rates of calcium removal by developing embryos2006Inngår i: Journal of Ornithology 147 (5), 2006Konferansepaper (Fagfellevurdert)
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