spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

First published online April 17, 2009
Journal of Experimental Biology 212, 1270-1276 (2009)
Published by The Company of Biologists 2009
doi: 10.1242/jeb.022764
This Article
Right arrow Summary Freely available
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Hanson, L. M.
Right arrow Articles by Brauner, C. J.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Hanson, L. M.
Right arrow Articles by Brauner, C. J.
Social Bookmarking
Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati   Add to Twitter  
What's this?

Intrinsic mechanical properties of the perfused armoured catfish heart with special reference to the effects of hypercapnic acidosis on maximum cardiac performance

Linda M. Hanson1,*, Daniel W. Baker1, Louise J. Kuchel1,{dagger}, Anthony P. Farrell2, Adalberto L. Val3 and Colin J. Brauner1

1 Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC, V6T 1Z4 Canada
2 Faculty of Land and Food Systems and Department of Zoology, University of British Columbia, Vancouver, V6T 1Z4 Canada
3 Laboratory of Ecophysiology and Molecular Evolution, Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil


Figure 1
View larger version (9K):
[in this window]
[in a new window]

  		Fig. 1. The effect of changes in input pressure on cardiac output (A) and cardiac stroke volume (B) in in situ perfused Pterygoplichthys pardalis hearts under control, normocapnic conditions at 27.0±0.2°C (N=6). Results are presented as change from routine preload pressure and were normalized to a first order sigmoidal equation (r2>0.98) as discussed in the Results. Data are presented as the means for each preload value ± s.e.m.

 

Figure 2
View larger version (5K):
[in this window]
[in a new window]

  		Fig. 2. The effect of changes in after-load on cardiac power output in in situ perfused Pterygoplichthys pardalis hearts under control, normocapnic conditions at 27.0±0.2°C (N=6). Data are presented as means ± s.e.m.

 

Figure 3
View larger version (15K):
[in this window]
[in a new window]

  		Fig. 3. The effect of hypercapnia on (A) maximum cardiac power generation, POmax, (B) maximum cardiac output, Qmax, (C) cardiac stroke volume and (D) heart rate of in situ perfused Pterygoplichthys pardalis hearts at 27.0±0.2°C (N=5). Hearts were sequentially exposed to CO2 tensions of 1.0% (control), 2.5%, 5.0% and 7.5% before being returned to 1.0% CO2 to assess recovery (open circles). Hearts were then re-exposed to 7.5% CO2 to permit sampling for intracellular pH determinations (marked circles). One heart failed to recover from exposure to extreme hypercapnia and thus has been presented separately (squares).

 

Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati   Add to Twitter Twitter    What's this?



© The Company of Biologists Ltd 2009