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Below are 10 random bionumbers. Click a row for more details
ID Property Organism Value Units Range Details
101355 Efficiency of the respiratory chain - nominal, based on standard free energies Generic Percent ~33
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102329 Salinity NaCl concentration growth range Bacteria Chromohalobacter salexigens M 0.1-4
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102135 Intestinal absorption of Alanine Human Homo sapiens 78.7 % ±6
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102043 Probability of ribosome binding to mRNA Bacteria Escherichia coli 0.8 unitless
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100636 Lysine abundance Bacteria Escherichia coli 6.4 Percent
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103866 Plasmid copy number of pC194 plasmid Bacteria Bacillus cereus 100 copies per chromosome
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103816 Human use of photosynthesis products: biomass, productivity, area Biosphere N/A Table link - http://tinyurl.com/cve3ve
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101888 Percentage of total ATP complexed to magnesium ion in anaerobic state of cell Generic 78 % +/- 4
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101085 Water withdrawals for human use worldwide Biosphere 5000 cubic kilometers per year
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105131 Activity of pR promoter (k(on)) Bacteriophage Lambda 6.7e+6 M^-1×sec^-1
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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.