B10NUMB3R5: The Database of Useful Biological Numbers

The BioNumbers database provides a collection of useful biological numbers across various organisms. Notable entries include the number of hairs on a human head, which ranges from 90,000 to 150,000, and the average duration of a single eye blink, measured at 0.1 to 0.4 seconds. For Escherichia coli, one unit of OD600 corresponds to a cell wet weight of 1.7 g/L and a cell dry weight of 0.39 g/L. The longest neuron in the human body extends from the base of the spine to the big toe, measuring up to 1 meter. The size of a glucose molecule in its open chain form is approximately 1.5 nm. In budding yeast (Saccharomyces cerevisiae), a culture with an OD600 of 1 has a cell concentration of about 30 million cells per milliliter. The mean volume of a human body is around 65.22 liters, and the diameter of human hair varies from 17 to 181 micrometers. Reaction times to stimuli such as sound, light, and touch are reported as 140-160 ms, 180-200 ms, and 155 ms, respectively. The genomic DNA amount in a diploid human cell is roughly 6 picograms, and collagen constitutes 30 to 40 percent of the body's protein content. The human body contains approximately 10 trillion blood and immune cells. The diameter of a HEK-293 cell is about 13 micrometers, and the doubling time for a normal laboratory haploid strain of budding yeast is around 90 minutes in specific media.