feedback

Disclaimer: Numbers in biology depend highly on conditions.
Use values as order of magnitude estimates or refer to experimental details in cited literature.

Below are 10 random bionumbers. Click a row for more details
ID Property Organism Value Units Range Details
100239 Dynamic range for gradient sensing of alpha-methylaspartate Bacteria Escherichia coli 5 orders of magnitude
more
101732 typical permeability coefficients in various cell membranes Various cm/min 0.02-0.42
more
104992 Number of distinct proteins in proteome Human Homo sapiens 28913 Unitless
more
104179 Rate constants for the various transitions of the metal dependent ATPases Various N/A Table link - http://tinyurl.com/lvng3e
more
102501 Length of RNA of 5.8S subunit of large subunit of ribosome Budding yeast Saccharomyces cerevisiae 159 nucleotides
more
104283 Shear stress of nucleus wall of Swiss 3T3 fibroblast mouse embryonic cell Mammalian tissue culture cell 9.4 dyn/cm^2
more
100134 Concentration of Mn ions (conditions of growth unknown) Bacteria Escherichia coli 4 mM
more
102856 Fat content in maternal milk Bison 1.7 %
more
102385 Endoplasmic reticulum proteomics datasets Various N/A Table link - http://tinyurl.com/3odnqw
more
104266 Diffusion coeffficient of Promyelocytic leukemia (PML) bodies in chromatin of HeLa cell Human Homo sapiens 1.2e-4 um^2/sec +-0.000031
more


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.

Use textbox on the left to tell us numbers you are searching for and couldn’t find or any comments.
Invitation to help BioNumbers with the most wanted numbers:
Log in as a user and make entries of the values below, references are much appreciated.
1) Number of HLA (Human Leukocyte Antigen, MHC) molecules on an average human cell.
2) Mass of total protein in human cell.