By J. A. Schafer, T. E. Andreoli (auth.), Professor Dr. Gerhard Giebisch (eds.)
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Extra resources for Transport Organs
Y], which will be termed f3i' is relatively constant in aqueous solutions over a wide range of temperatures (WANG, 1951; LoNGSWORTH, 1963). y]= f3i' and by substitution: r 1 - 1 = -1]+ PD , ' f3i Pm, . (9) Equation 9 indicates that, if there are significant unstirred layers adjacent to a membrane, increasing the viscosity in the bulk aqueous phases will result in linear decrements in PD ,. We have examined this question directly in the isolated perfused cortical collecting tubule: 10-fold increases in the viscosity of both the perfusing and bathing solutions had no effect on PDw' the measured diffusional permeability coefficient for water (SCHAFER and ANDREOLI, 1972a).
Under these circumstances, the voltage drop across the tip of the perfusion pipet must first be nulled using a bridge circuit or a negative-resistance external circuit; the resulting ~ across the tubule can then be measured. This latter method can be applied only to tubule segments having relatively high transepithelial electrical resistances. When the current pulse is passed at one end of the tubule, e. , from the perfusing pipet, the resultant L1 ~ is maximal at the perfusion end of the segment and is attenuated with distance away from this point, due to current flow across the tubular epithelium.
GRANlHAM et al. (1972) demonstrated the accuracy and reliability of the method of measuring Iv in proximal convoluted tubules; as expected, the intercept of a plot of Iv versus length was nearly zero. More recently, 'GRANlHAM et al. (1973) have used another technique for measuring net volume transport in crimped tubules. Instead of measuring Iv from the rate of THO appearance in the bathing solution, these workers measured the rate of change in the fluid volume in the inner pipet by observing the rate of movement of a droplet of naphtha in a constant bore region of the pipet.
Transport Organs by J. A. Schafer, T. E. Andreoli (auth.), Professor Dr. Gerhard Giebisch (eds.)