Table 2.

Hydraulic conductivity (Lp: cm²* sec/g) for a variety of physiological membranes

Membrane	Typea	Lp×1011
Kidney epithelial cells (MDCK cells)b	a	0.075
Xenopus oocytesc	a	0.2
Xenopus oocytes +CHIP28c	a	1.6
Proximal tubule epithelial cellsd	a	1.2
Red blood cellsd,e	a	1–1.6
Gall bladder epithelial cellsf	a	4–9
Corneal epitheliumg,h	b	0.04–0.7
Gall bladder epitheliumd,f	b	1.3–3.6
Proximal tubule epitheliumb,d	b	7.5–55
Rentinal pigment epitheliumi	b	16
Brain capillaryj	c	0.03
Corneal endotheliumg,k	c	0.14–5
Lung capillaryj	c	3.4
Skeletal muscle capillaryj,l	c	2.5–7
Cardiac muscle capillaryj,l	c	8.6
Aortam	c	9
Mesentery, omentumj	c	50
Intestinal mucosaj,l	d	32–130
Synovium (knee)l	d	120
Renal peritubulal capillariesl	d	225–700
Renal glomerulusj,l	d	400–3100
Descemet's membraneh	e	15–37
Lens capsulen	e	17–50
Bruch's membraneo	e	2000–12 500
Kidney tubule basement membranep	e	6300–13 700

^aa, cell membranes; b, unfenestrated epithelium; c, unfenestrated endothelium; d, fenestrated epithelia; and e, basement membranes.

^bTimbs and Spring (1996).

^cPreston et al. (1992).

^dGonzalez et al. (1982).

^eSolomon et al. (1983).

^fPersson and Spring (1982).

^gKlyce and Russell (1979).

^hFatt (1969).

ⁱTsuboi (1987).

^jRenkin (1977).

^kHedbys and Mishima (1962).

^lLevick and Smaje (1987).

^mVargas et al. (1979).

ⁿFisher (1982).

^oStarita et al. (1996) (eyes under 40) and Bentzel and Reczek (1978).

^pWelling and Welling (1978).