The phrase "a random area of" is correct and usable in written English.
It can be used when referring to an unspecified or arbitrary location or section within a larger context.
Example: "During the survey, we selected a random area of the park to collect data on wildlife."
Alternatives: "an arbitrary section of" or "a selected region of".
r values were normalized from 0 to R = 1, and pixel intensity values of each image were normalized by the darkest point in each particle's centre (0) and an average intensity of a random area of background ultrathin carbon film (1).
For estimating yield, a random area of 1 m × 1 m size was selected from each plot excluding boarder rows and columns of the plot.
Later that day, the area of convection degenerated into a "random area of cloudiness".
Measurements were started by scanning a random area of 50 × 50 μm which could contain several to dozens of bacterial cells.
A blinded observer set a random area of the photographed cell culture (as seen in Figure 7b) using Adobe Photoshop software (i) of cells treated with human apoptotic MNC-secretomes and (ii) of cells treated with cell culture medium (control).
The Wicksell transform [ 11, 12] was applied to islet radii to address the problem of estimating the real radii distribution from profile radii by means of Bach's eigenfunctions [ 13, 14].Islet density was quantified by measuring a random area of pancreas using Image Pro Plus and then counting the number of islets contained within that pancreatic area, the results being expressed as islets per mm.
In order to simulate a situation where the antigen of interest (AR in this case) is present only in a limited area, we performed a test where we set the intensity of some random areas of the TRF image to null.
Immunostained and DAPI-stained cells were counted in 10 20 random areas of each culture coverslip using an eyepiece grid at a magnification of 200× or 400×.
Random areas of each chamber were imaged with a Zeiss Axioplan 2 microscope (Carl Zeiss).
Proliferation and apoptosis were evaluated by counting Ki67-positive cells and apoptotic structures, respectively, from 3 to 5 random areas of each tumour section and calculated as a percentage of total cells.
One sure way to find a stunt spot is to look for oddly placed ramps throughout random areas of the city.
