Table 1.

Rates of relative area loss 1/τ for different membrane-particle systems.

	gel phase (10−3 s−1)	fluid phase (10−3 s−1)
r = 11 nm	−3 ± 1	−3 ± 1
r = 42 nm	−5 ± 3	−5 ± 4
r = 123 nm	approx. −2a	no uptake

^aMost particles are bound to the membrane.