Resolution: Difference between revisions
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''Resolution'', in structure determinations, is the distance corresponding to the smallest observable feature: if two objects are closer than this distance, they appear as one combined blob rather than two separate objects. | ''Resolution'', in structure determinations, is the distance corresponding to the smallest observable feature: if two objects are closer than this distance, they appear as one combined blob rather than two separate objects. | ||
'''2.05 Å''' is the '''median''' resolution for [[X-ray crystallography|X-ray crystallographic]] results in the Protein Data Bank (88,701 on May 15, 2014). For comparison, the van der Waals diameter of a carbon atom is 3.4-3.7 Å<ref name="atomsize">See [http://en.wikipedia.org/wiki/Atomic_radii_of_the_elements_(data_page) Atomic radii of the elements (Wikipedia)], and [http://chemwiki.ucdavis.edu/Theoretical_Chemistry/Chemical_Bonding/General_Principles/Covalent_Bond_Distance,_Radius_and_van_der_Waals_Radius values from an Inorganic Chemistry textbook].</ref>, and the length of a carbon-carbon bond is 1.5 Å<ref name="atomsize" />. | '''2.05 Å''' is the '''median''' resolution for [[X-ray crystallography|X-ray crystallographic]] results in the Protein Data Bank (88,701 on May 15, 2014). For comparison, the van der Waals diameter of a carbon atom is 3.4-3.7 Å<ref name="atomsize">See [http://en.wikipedia.org/wiki/Atomic_radii_of_the_elements_(data_page) Atomic radii of the elements (Wikipedia)], and [http://chemwiki.ucdavis.edu/Theoretical_Chemistry/Chemical_Bonding/General_Principles/Covalent_Bond_Distance,_Radius_and_van_der_Waals_Radius values from an Inorganic Chemistry textbook].</ref>, and the length of a covalent carbon-carbon bond is 1.5 Å<ref name="atomsize" />. | ||
The uncertainty of the position of each atom in a crystallographic model is quantitated in its [[Temperature_value|temperature value]]. | The uncertainty of the position of each atom in a crystallographic model is quantitated in its [[Temperature_value|temperature value]]. | ||
