scholarly journals Shell Strength and Carbonic Anhydrase Activity of the Shell Gland of the Domestic Fowl

1968 ◽  
Vol 47 (3) ◽  
pp. 858-862 ◽  
Author(s):  
P.J. Heald ◽  
Dianne Pohlman ◽  
E.G. Martin
Keyword(s):  
Carbonic Anhydrase ◽  
Domestic Fowl ◽  
Carbonic Anhydrase Activity ◽  
Shell Gland

scholarly journals Embryonic exposure to oestrogen causes eggshell thinning and altered shell gland carbonic anhydrase expression in the domestic hen

Reproduction ◽  
2004 ◽  
Vol 128 (4) ◽  
pp. 455-461 ◽  
Author(s):  
C Berg ◽  
A Blomqvist ◽  
L Holm ◽  
I Brandt ◽  
B Brunström ◽  
...  
Keyword(s):  
Carbonic Anhydrase ◽  
Environmental Concern ◽  
Carbonic Anhydrase Activity ◽  
Shell Gland ◽  
In Ovo ◽  
Functional Disturbance ◽  
Embryonic Exposure ◽  
Eggshell Thinning ◽  
Resistance To Deformation ◽  
Domestic Hen

Eggshell thinning among wild birds has been an environmental concern for almost half a century. Although the mechanisms for contaminant-induced eggshell thinning are not fully understood, it is generally conceived to originate from exposure of the laying adult female. Here we show that eggshell thinning in the domestic hen is induced by embryonic exposure to the synthetic oestrogen ethynyloestradiol. Previously we reported that exposure of quail embryos to ethynyloestradiol caused histological changes and disrupted localization of carbonic anhydrase in the shell gland in the adult birds, implying a functional disturbance in the shell gland. The objective of this study was to examine whether in ovo exposure to ethynyloestradiol can affect eggshell formation and quality in the domestic hen. When examined at 32 weeks of age, hens exposed to ethynyloestradiol in ovo (20 ng/g egg) produced eggs with thinner eggshells and reduced strength (measured as resistance to deformation) compared with the controls. These changes remained 14 weeks later, confirming a persistent lesion. Ethynyloestradiol also caused a decrease in the number of shell gland capillaries and in the frequency of shell gland capillaries with carbonic anhydrase activity. These data suggested that a disrupted carbonic anhydrase expression was involved in the mechanism for the oestrogen-induced eggshell thinning found in this study. The results support our hypothesis that eggshell thinning in avian wildlife can result from a structural and functional malformation in the shell gland, induced by xeno-oestrogen exposure during embryonic development.

The influence of saline drinking water on the activity of carbonic anhydrase in the shell gland of laying hens

1989 ◽  
Vol 40 (5) ◽  
pp. 1111 ◽  
Author(s):  
I Yoselewitz ◽  
D Balnave
Keyword(s):  
Drinking Water ◽  
Carbonic Anhydrase ◽  
Laying Hens ◽  
Specific Activity ◽  
Carbonic Anhydrase Activity ◽  
Shell Gland ◽  
Shell Quality ◽  
The Poor ◽  
Egg Shell ◽  
Reduced Activity

Carbonic anhydrase activity was measured in three experiments using mucosal extracts from the shell gland of laying hens given drinking water consisting of town water with or without the addition of sodium chloride (2 g/l). Hens laying eggs with normal or defective shells on both treatments were used. The specific activity of carbonic anhydrase was significantly lower in hens receiving the saline drinking water, but egg shell type had no significant effect on enzyme activity. The results indicate that a reduced activity of carbonic anhydrase in the shell gland contributes to the poor egg shell quality observed in hens receiving saline drinking water.

1123: Renal Oxalate Transport Depends on Local Carbonic Anhydrase Activity in the Proximal Tubule

2004 ◽  
Vol 171 (4S) ◽  
pp. 296-296
Author(s):  
Michael Straub ◽  
Joséphine Befolo-Elo ◽  
Richard E Hautmann ◽  
Edgar Braendle
Keyword(s):  
Carbonic Anhydrase ◽  
Proximal Tubule ◽  
Carbonic Anhydrase Activity ◽  
Oxalate Transport

RENAL CARBONIC ANHYDRASE IN PREMATURE AND MATURE INFANTS

PEDIATRICS ◽  
1951 ◽  
Vol 7 (2) ◽  
pp. 182-185
Author(s):  
RICHARD DAY ◽  
JANE FRANKLIN
Keyword(s):  
Carbonic Anhydrase ◽  
Premature Infants ◽  
Carbonic Anhydrase Activity ◽  
Renal Carbonic Anhydrase

The carbonic anhydrase activity in the kidneys of premature infants was studied because it was thought that if the renal enzyme is as deficient as that in the blood, inefficiency in acidification of urine might result. In contrast with the blood, postmortem specimens of kidneys of premature infants were found to exhibit carbonic anhydrase activity similar to that found in the case of kidneys from older infants and adults.

The Effect of Cholera Toxin on Choroid Plexus Carbonic Anhydrase Activity In Vitro

1980 ◽  
Vol 1 (4) ◽  
pp. 333-339
Author(s):  
Arthur M. Feldman ◽  
Mel H. Epstein ◽  
Fallon Maylack ◽  
Saul W. Brusilow
Keyword(s):  
Carbonic Anhydrase ◽  
Choroid Plexus ◽  
Cholera Toxin ◽  
Carbonic Anhydrase Activity
Sign in / Sign up

Export Citation Format

Share Document