Previous studies of the hydraulic conductivity of connective tissues have failed to show a correspondence between ultrastructure and specific hydraulic conductivity. We used the technique of quick-freeze/deep-etch to examine the ultrastructure of the corneal stroma and then utilized morphometric studies to compute the specific hydraulic conductivity of the corneal stroma. Our studies demonstrated ultrastructural elements of the extracellular matrix of the corneal stroma that are not seen using conventional electron microscopic techniques. Furthermore, we found that these structures may be responsible for generating the high flow resistance characteristic of connective tissues. From analysis of micrographs corrected for depth-of-field effects, we used Carmen-Kozeny theory to bound a morphometrically determined specific hydraulic conductivity of the corneal stroma between and These bounds encompass experimentally measured values in the literature of to The largest source of uncertainty was due to the depth-of-field estimates that ranged from 15 to 51 nm; a better estimate would substantially reduce the uncertainty of these morphometrically determined values.
Specific Hydraulic Conductivity of Corneal Stroma as Seen by Quick-Freeze/Deep-Etch
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division Jan. 2000; revised manuscript received Oct. 2000. Associate Editor: C. Ross Ethier.
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Overby , D., Ruberti, J., Gong , H., Freddo, T. F., and Johnson, M. (October 1, 2000). "Specific Hydraulic Conductivity of Corneal Stroma as Seen by Quick-Freeze/Deep-Etch ." ASME. J Biomech Eng. April 2001; 123(2): 154–161. https://doi.org/10.1115/1.1351888
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