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 January 18, 2008
Journal of Experimental Biology 211, 459-465 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.013219
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 Google Scholar
Google Scholar
Right arrow Articles by Tsahar, E.
Right arrow Articles by del Rio, C. M.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Tsahar, E.
Right arrow Articles by del Rio, C. M.

Dietary protein influences the rate of 15N incorporation in blood cells and plasma of Yellow-vented bulbuls (Pycnonotus xanthopygos)

Ella Tsahar1,*, Nathan Wolf2, Ido Izhaki3, Zeev Arad1 and Carlos Martínez del Rio2

1 Department of Biology, Technion – Israel Institute of Technology, Haifa 32000, Israel
2 Department of Zoology and Physiology, University of Wyoming, Laramie, WY 82071, USA
3 Department of Biology, University of Haifa at Oranim, K. Tivon 36006, Israel


Figure 1
View larger version (13K):
[in this window]
[in a new window]

  		Fig. 1. The reaction progress variable plots all showed decreasing trends between ln(1–F) and time. However, it is difficult to discern from these plots whether a one- or a two-compartment model should be applied to each data set. Different symbols in each panel label data for each individual. For all figures, see List of abbreviations and symbols for definitions.

 

Figure 2
View larger version (16K):
[in this window]
[in a new window]

  		Fig. 2. One-compartment, first-order kinetic models of isotopic incorporation models adequately described the incorporation of 15N into the blood cells and plasma of Yellow-vented bulbuls. Points are means and bars are s.e.m. The curves were fitted using mean values of {delta}15N({infty}), [{delta}15N({infty})–{delta}15N(0)] and {tau}. The values for these parameters are shown in the equations. Both equations and fitted curves are presented for descriptive purposes only. All statistical analyses were conducted on data for individuals.

 

Figure 3
View larger version (12K):
[in this window]
[in a new window]

  		Fig. 3. Dietary protein content had a significant effect on the average residence time of 15N in the plasma solutes and blood cells of Yellow-vented bulbuls. Columns denote means and bars s.e.m. Means with the same letter in each panel are not statistically different from each other. We plotted the data on plasma and cells using the same scale to emphasize the large difference in incorporation rate, and hence residence time, between these two tissues.

 

Figure 4
View larger version (7K):
[in this window]
[in a new window]

  		Fig. 4. Dietary protein content had a significant effect on the tissue-to-diet discrimination factor in Yellow-vented bulbuls. Columns denote means and bars s.e.m. Means with the same letter in each panel are not statistically different from each other.

 

Figure 5
View larger version (8K):
[in this window]
[in a new window]

  		Fig. 5. The {delta}15N of cells, plasma and excreta was significantly enriched relative to diet in Yellow-vented bulbuls on all diets. In contrast, the {delta}15N of urine was depleted relative to diet in birds fed the diet with the low protein content. The {delta}15N of urine did not differ from that of diet in birds fed the diets with the medium and high protein content. Error bars represent 95% confidence intervals for means.

 




© The Company of Biologists Ltd 2008