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  • 1
    Electronic Resource
    Electronic Resource
    Quail Rathke's pouch differentiation (1978)
    Springer
    Anatomy and embryology 153 (1978), S. 23-36 
    Details
    ISSN: 1432-0568
    Keywords: Electron microscopy ; Quail embryo ; Rathke's pouch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Adenohypophyseal region of quail embryo has been examined by electron microscopy from stage 12 to stage 21 of Zacchei (1961). The Seessel's pouch develops prior to the early stages of adenohypophysis formation, then regresses while Rathke's pouch proliferates and differentiates. From Rathke's pouch formation by stage 12 (48 h of incubation) until appearance of the first secretory granules by stage 21 (6 days of incubation), there are no major ultrastructural modifications in adenohypophyseal cells. Mitochondria, Golgi vesicles, polysomic ribosomes, pinocytotic vesicles, and mitotic figures become more numerous while nucleocytoplasmic ratio and the number of ribosomes and lipid droplets decreases. The major change is the appearance of secretory granules by day 6 of incubation. This phenomenon occurs at the same time as in chick embryo, despite an incubation period shorter for quail than for chick. Mitotic figures are mainly distributed near the pouch lumen, while secretory granules are first located in the peripheral cells of the cephalic part ofpars distalis primordium. The hypothetical role of mesenchyme and vascularization is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00569847
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Embryonic and post-natal changes in activity and molecular forms of mucosal cell butyrylcholinesterase in chicken intestine (1990)
    Springer
    Molecular and cellular biochemistry 96 (1990), S. 143-151 
    Details
    ISSN: 1573-4919
    Keywords: cholinesterase ; butyrylcholinesterase ; molecular forms ; mucosal cells ; chicken intestine ; development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary The mucosal cells of the chicken intestine contain a cholinesterase activity essentially due to butyrylcholinesterase. The enzyme is present during embryonic and post-hatching development. The activity reaches a maximum value at day 19 in ovo and decreases prior to and after hatching up to day 4 ex ovo. Then the activity again rises reaching a second maximum at 2–3 weeks. Beyond this stage, the activity slowly decreases leveling off to the value determined in adult chicken. The enzyme exists as two globular forms (G1 and G4) soluble at low-ionic strengths. The G4 form is predominant in ovo up to day 19. From this stage and after hatching the G1 form is the main one. This change in the form proportion differentiates the mucosal cell butyrylcholinesterase from butyrylcholinesterase of other origins such as the chicken plasma enzyme which always shows a predominant G4 form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420906
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Characterization of cholinesterase molecular forms in the mucosal cells along the intestine of the chicken (1989)
    Springer
    Molecular and cellular biochemistry 85 (1989), S. 49-56 
    Details
    ISSN: 1573-4919
    Keywords: cholinesterase ; butyrylcholinesterase ; molecular forms ; mucosal cells ; chicken intestine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The presence of a butyrylcholinesterase (BuChE, EC 3.1.1.8) in the musocal cells of the chicken intestine was demonstrated by histochemical and biochemical methods. The study of its distribution, along the intestine from duodenum to rectum, showed that the jejuno-ileum possesses the highest activity. Sucrose gradient centrifugation revealed, in all intestinal areas, two globular forms with sedimentation coefficients of 4.3 S (G1 form) and 10.8 S (G4 form). The presence of Triton X-100 in the preparations did not modify the sedimentation profiles of these two forms which can be considered as soluble BuChE. The ratio of G1/G4-forms progressively decreases along the intestine from duodenum to rectum indicating a predominance of the G4 form in the areas where the activity is low. Our results are discussed in relation to other studies of globular forms of chicken BuChE.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223513
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    Paper (German National Licenses)
    Fulltext
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