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Below are 10 random bionumbers. Click a row for more details
ID Property Organism Value Units Range Details
103769 Number of nicotinic acetylcholine receptors on surface of keratinocyte Unspecified ~35000 molecules/cell
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100042 Concentration of RNA in cell Bacteria Escherichia coli 97.5 mg/ml 75-120
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102054 Time separating onset of synthesis of consecutive okazaki fragments Bacteria Escherichia coli <=2 sec
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100795 Characteristic radius of capillary in mammals Unspecified 5 micron
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101691 volume of bacterium Mycobacterium tuberculosis ~8.4 um^3
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103342 Molecular weight of E. coli and Salmonella fimbriae Bacteria Escherichia coli kDa 14-29.5
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100825 Mesophyll leaf cross sectional cell size Thale cress Arabidopsis thaliana 1335 micron^2
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100601 Net primary producitivty - collection of references and values Biosphere N/A Database link - http://tinyurl.com/5jk73a
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103029 Number of ouabain molecules bound to sodium-potassium pump when completely saturated Guinea Pig Cavia porcellus 1.1e+11 molecules/per mg colon tissue
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102216 number of ribosomes Bacteria Rickettsia prowazekii 1500 ribosomes/cell
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BioNumbers - the numbers you need, with references, in under a minute.

In August 2008, twenty highly motivated Harvard graduate students and post-docs were given the QBioChallenge - a set of six basic questions in quantitative biology.

For example: How many mRNAs are in a yeast cell? (a)~10,000 (b)~100,000 (c)~1,000,000 or (d)~10,000,000

After an hour of searching the internet and Harvard's collection of electronic journals, they got fewer than half of the questions right. Following this frustrating effort they were given a tip: use bioNumbers (www.bioNumbers.org). Using bioNumbers they found the answers to most questions and had full references within 10 minutes. In a few more minutes they became registered users and added entries to the bioNumbers database themselves.

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