Bacterial Cells. Bacterial cells are very small-about 10 times smaller than most plant and animal cells. Most bacterial cells range in size from 0.2 to 10 microns or micrometers (0.0000079 to 0.00039 inches). Common Escherichia coli, or E.coli, bacteria are rod-shaped bacteria, 1 micron by 2 microns long.
1 Installing a concrete paver patio averages between $8 and $15 per square foot.  Stone: The most natural option, stone comes in several sizes, textures, colors and styles. Most homeowners opt for stone to create a design-focused patio. Installing a stone paver patio averages between $4 and $8 per square foot.
You probably want something like attractive patio pavers (flat stones) or rocks to tread upon. Home improvement chain stores sell the patio pavers for around a buck and upward. If you need, say, 800 inexpensive patio pavers for a 200-square-foot patio, that will generally equate to the price of a concrete patio. Not too bad, until you factor in the price of hiring someone to put them in the ground and any other extras your patio might need. HomeWyse.com places the average cost of a 230-square-foot patio that uses patio stones from about $2,850 to $3,540.