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 September 9, 2005
Journal of Experimental Biology 208, 3603-3607 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01778
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 Similar articles in PubMed
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 HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Suarez, R. K.
Right arrow Articles by Hochachka, P. W.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Suarez, R. K.
Right arrow Articles by Hochachka, P. W.
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?

Roles of hierarchical and metabolic regulation in the allometric scaling of metabolism in Panamanian orchid bees

Raul K. Suarez1,3,*, Charles-A. Darveau2,3 and Peter W. Hochachka2,{dagger}

1 Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106-9610, USA
2 Department of Zoology, University of British Columbia, Vancouver, BC, Canada V6T 1Z4
3 Smithsonian Tropical Research Institute, Barro Colorado Island, Republic of Panama



View larger version (20K):

[in a new window]
  		Fig. 1. ln(enzyme activity in µmol g-1 min-1) vs ln(flux rate in µmol g-1 min-1) across orchid bee species. Slopes of regressions represent hierarchical regulation coefficients, {rho}h. These values are equal to 0.46 (COX, cytochrome oxidase), 0.98 (HK, hexokinase), and 0.36 (GP, glycogen phosphorylase), and significant for these three enzymes (P values are indicated in Table 1). Slopes are not significantly different from zero in the case of GPDH (glycerol 3-phosphate dehydrogenase), CS, citrate synthase, PGI (phosphoglucoisomerase), PFK (phosphofructokinase) and TR (trehalase).

 


View larger version (16K):

[in a new window]
  		Fig. 2. (A) Mass action ratio vs glycolytic flux rate (i.e. net forward flux at the phosphoglucoisomerase reaction). The Haldane relationship predicts that extremely small variation in the mass action ratio is enough to account for the range of glycolytic flux rates of 4.64-13.0 µmol g-1 min-1 observed across species. (B) Glycolytic flux rate (i.e. net forward flux at the PGI reaction) vs glucose 6-phosphate concentration. Holding fructose 6-phosphate concentration at 0.1 mmol l-1, the Haldane relationship predicts that the range of glycolytic flux rates of 4.64-13.0 µmol g-1 min-1 observed across species is achieved by a change in glucose 6-phosphate concentration of about 0.02 mmol l-1.

 

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 2005