Range 
Table  link

Organism 
Rat Rattus norvegicus 
Reference 
Willführ A et al., Estimation of the number of alveolar capillaries by the Euler number (EulerPoincaré characteristic). Am J Physiol Lung Cell Mol Physiol. 2015 Dec 1 309(11):L128693. doi: 10.1152/ajplung.00410.2014 p.L1290 table 1PubMed ID26432874

Method 
Abstract: "Here, [investigators] present a new stereological method to estimate the number of capillary loops in the ACN [alveolar capillary network]. One advantage of this method is that it is independent of the shape, size, or distribution of the capillaries. [They] used consecutive, 1 μmthick sections from epoxy resinembedded material as a physical disector. The EulerPoincaré characteristic of capillary networks can be estimated by counting the easily recognizable topological constellations of "islands," "bridges," and "holes."" 
Comments 
P.L1290 left column 2nd paragraph: "Table 1 summarizes the means of the stereological parameters obtained in this study. Figures 4 and 5 demonstrate the data of the individual animals for various stereological parameters. As expected, all global parameters (volume, surface area, and number) increased from the early postnatal to the young adult rats. However, differences were noted in the degree of changes. Whereas volume and surface area increased by a factor of 6.2 and 6.9, respectively, the number of capillary loops was 9.1 times higher in the young adult than in the 6dayold rats. The number of alveoli increased by a factor of 12.9, thus leading to a similar number of capillary loops per alveolus in both age groups. The mean volume of alveoli calculated from volume and number was not significantly higher in the 42dayold than in the 6dayold rats." See abbreviations beneath table 
Entered by 
Uri M 
ID 
113843 