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## Results: 9

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Schematic of the experimental setup. The filter cube and microlense and pinhole arrays (which have been modified to allow laser illumination while not rotating) are inside the spinning disk confocal head. Demagnifying optics were placed between the confocal head and the camera to allow more pinholes to be imaged.

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(

*A*,*upper*) A correlation curve from a solution of 40 nm colloids, obtained in 5 min by averaging data from ∼380 pinholes (*blue*) with a best fit to Eq. 1 (*red*). (*A*,*lower*) The residuals to the fit are of order 10^{−3}. (*B*) A dilution series for 40 nm colloids showing how the measured number of particles changes (FCS in*blue*, PACI in*red*). Lines are best fits to the expected linear trend.6.

PACI measurements obtained by averaging data from different pinholes for solutions of RPE with 0%, 16%, 32%, 40%, 48%, and 56% sucrose. (

*A*) Normalized correlation curves (*blue*) with best fits to Eq. 1 (*red*). (*B*) As expected, the measured diffusion time,*τ*_{D}, increases linearly with the solutions viscosity,*η*, (where*η*_{0}is the viscosity of water). Viscosities for sucrose solutions were obtained from (24). Errors in viscosity were assumed to arise from a 1% error in determining the sucrose concentration (with a linear extrapolation of the viscosities from (24)).7.

FOXO-GFP at the edge of a cell. (

*A*) An image of the cell edge obtained with the Nipkow disk spinning. (*B*) The disk was stopped and a PACI measurement was performed. The displayed map shows the locations of the pinholes with their color indicating the measured number of particles at that location (*scale to right*). (*C*) The measured number of particles at each location as a function of distance along the cell. (*D*) The measured diffusion time as a function of distance along the cell. (*E*) Two represented correlation curves from the indicated locations (*blue*) with the associated best fits to Eq. 1 (*red*).8.

Measurements on a solution of RPE in 32% sucrose. (

*A*,*left*) 40 correlation curves measured from different pinholes in 3.8 s (*blue*), with associated best fits (*red*). (*A*,*right*) correlation curves from the same 40 pinhole locations measured in 19 s (*blue*), with associated best fits (*red*). (*B*) The variance between pinholes (divided by the mean squared) of measured particle number (*N*,*green*) and diffusion time (*τ*_{D},*blue*) as a function of acquisition time. Both curves where fit to the function (*red*), where*E*is the intrinsic variance between pinholes,*T*is the acquisition time, and*a*is a constant (see text for details).9.

Behavior of FOXO-GFP in tissue culture cells studied with PACI. (

*A*) 15 representative correlation curves (*blue*) with best fits to Eq. 1 (*red*). (*B*) Histograms of the measured values of diffusion time, (*τ*_{D},*left*), and particle number (*right*) obtained from 89 locations in ∼161 s. (*C*) Spatial maps showing the measured mean fluorescence intensity (*left*) and particle number (*right*) at different pinholes. The focus is a few microns above the coverslip. Under the experimental conditions FOXO-GFP is predominantly cytoplasmic, and consistent correlation curves could not be obtained from the nucleus. Scale bar = 10*μ*m.