scholarly journals Fear-Related Responses of White Leghorn Hens of Several Genetic Stocks in Five-Bird Cages and Associations with Quantitative Traits

1984 ◽  
Vol 63 (9) ◽  
pp. 1679-1688 ◽  
Author(s):  
S.K. KUJIYAT ◽  
J.V. CRAIG ◽  
A.D. DAYTON
1986 ◽  
Vol 65 (12) ◽  
pp. 2199-2207 ◽  
Author(s):  
J.V. CRAIG ◽  
J. VARGAS VARGAS ◽  
G.A. MILLIKEN
Keyword(s):  

Author(s):  
M.R. Richter ◽  
R.V. Blystone

Dexamethasone and other synthetic analogs of corticosteroids have been employed clinically as enhancers of lung development. The mechanism(s) by which this steroid induction of later lung maturation operates is not clear. This study reports the effect on lung epithelia of dexamethasone administered at different intervals during development. White Leghorn chick embryos were used so as to remove possible maternal and placental influences on the exogenously applied steroid. Avian lung architecture does vary from mammals; however, respiratory surfactant produced by the lung epithelia serves an equally critical role in avian lung physiology.


Author(s):  
G. M. Cohen ◽  
J. S. Grasso ◽  
M. L. Domeier ◽  
P. T. Mangonon

Any explanation of vestibular micromechanics must include the roles of the otolithic and cupular membranes. However, micromechanical models of vestibular function have been hampered by unresolved questions about the microarchitectures of these membranes and their connections to stereocilia and supporting cells. Otolithic membranes are notoriously difficult to preserve because of severe shrinkage and loss of soluble components. We have empirically developed fixation procedures that reduce shrinkage artifacts and more accurately depict the spatial relations between the otolithic membranes and the ciliary bundles and supporting cells.We used White Leghorn chicks, ranging in age from newly hatched to one week. The inner ears were fixed for 3-24 h in 1.5-1.75% glutaraldehyde in 150 mM KCl, buffered with potassium phosphate, pH 7.3; when postfixed, it was for 30 min in 1% OsO4 alone or mixed with 1% K4Fe(CN)6. The otolithic organs (saccule, utricle, lagenar macula) were embedded in Araldite 502. Semithin sections (1 μ) were stained with toluidine blue.


2013 ◽  
Vol 7 (2) ◽  
pp. 245-249 ◽  
Author(s):  
Scott E. Sattler ◽  
John J. Toy ◽  
James Aketch Okeno ◽  
Deanna L. Funnell-Harris ◽  
Jeffrey F. Pedersen

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