What is R merge in crystallography?
Abstract. In macromolecular X-ray crystallography, refinement R values measure the agreement between observed and calculated data. Analogously, Rmerge values reporting on the agreement between multiple measurements of a given reflection are used to assess data quality.
What is R-value in PDB?
R-value is the measure of the quality of the atomic model obtained from the crystallographic data. When solving the structure of a protein, the researcher first builds an atomic model and then calculates a simulated diffraction pattern based on that model.
What is a good Rmerge value?
1) The lower the R(merge or sym), the better (in both small molecules and macromolecules stuff above 10% is not so good) 2) The higher redundancy, the better (above 3 is acceptable)
What is a good Rfree crystallography?
Good Values for Free R As a rule of thumb, for models with resolution of 2.0 Å or better (Å values <2.0), free R should not exceed (resolution/10) by more than 0.05; that is, if the resolution is 2.0 Å, free R should not significantly exceed 0.25.
What is completeness in crystallography?
Completeness of data can be defined by the number of collected crystallographic reflections in comparison to the number of theoretically possible reflections unique for the given crystal symmetry.
What is the crystallographic plane parallel to a 3-translation?
For example, the crystallographic plane parallel to a 3 – translation and passing through the diagonal, which connects vectors a 1 a 2 -is always(110) and passing through the ends of vectors a 1 a 2 a
What are the crystallographic directions of a hexagonal crystal?
of crystallographic directions hexagonal crystal The hexagon edge (X-direction) is parallel to the translation vector a 1, That is r= a 1, hence is along the  – direction. For Y – direction r= a 1 + 2 a 2 that is -direction The system is based on four translation vectors, three of them being in the hexagon plane (i.e. a 1, a 2, a s
What is the Coordinated Effect of a merger?
Δ Δ is either 0 or 1: firms internalize the profits from owned product but do not internalize the other products. After the merger, the mode of competition may change. For example, the tacit collusion becomes easier and it can happen. This effect, caused by the change in the mode of competition, is called the coordinated effect of a merger.
Can we predict the market response to a hypothetical merger?
Then, we conduct the first kind of counterfactual analysis, the merger simularion. In this exercise, we predict the market response when the ownership structure of product is changed due to a hypothetical merger. Every market institution needs its own model for merger simulation: