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Below are 10 random bionumbers. Click a row for more details
ID Property Organism Value Units Range Details
102675 size of pore across HIV TAT protein allowing passage through membrane HIV 3 nm
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101332 Coefficient of Variance of Generation Time Yeast Saccharomyces ellipsoideus 0.2 unitless
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101354 Efficiency of the TCA cycle - nominal, based on standard free energies Generic ~94 Percent
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104262 Nucleus fraction out of total cell volume in hepatocyte within liver parenchyma Rat Rattus norvegicus Percent 5-10
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101134 Kcat of Lys decarboxylase Bacteria Escherichia coli 8e+5 1/min
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104876 Amino acid composition of the proteins from E. coli cell supernatant Bacteria Escherichia coli N/A Table link -http://tinyurl.com/y9o59sk
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104832 Purification of corn leaf inorganic Pyrophosphatase Corn Zea mays N/A Table link - http://tinyurl.com/l5j6j9
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104941 Maximal culture density of E. coli on Luria Bertani medium Bacteria Escherichia coli 20.5 g/L
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104449 Number of ATP molecules in HeLa cell Human Homo sapiens 5.3e+9 Copies/cell
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102481 Number of microvilli per cell on HeLa cell Human Homo sapiens ~200 microvilli/cell
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Did you ever need to look up a number like the volume of a cell or the cellular concentration of ATP, only to find yourself spending much more time than you wanted on the Internet or flipping through textbooks - all without much success?

Well, it didn’t happen only to you. It is often surprising how difficult it can be to find concrete biological numbers, even for properties that have been measured numerous times. To help solve this for one and all, BioNumbers (the database of key numbers in molecular biology) was created. Along with the numbers, you'll find the relevant references to the original literature, useful comments, and related numbers.

Though we have made an honest first try at simplifying the process of finding useful biological numbers, there is still much work to be done. A key challenge is filling in the large number of missing items. Another challenge involves setting up a reliable and discriminating search engine which on a first try yields the numbers a user is actually interested in finding.