Exact(12)
There were no systematically absent thicknesses.
This is analogous to 3D X-ray crystallography, where centered and non-symmorphic space groups result in "systematically absent" or in other words "extinct" reflections.
In the amplitude map of the dFT of a 2D-periodic image with one of the plane symmetries that is compatible with the rectangular centered Bravais lattice type, i.e., cm or c2mm, one needs to label the 'diffraction peaks' in a way that index sums are always even because one considers all odd integer sum 'reflections' as being systematically absent [25].
Biological false negatives are systematically absent from screening data.
Since all datasets were collected using synchrotron radiation, determination of systematically absent reflections should be reliable.
Lisch nodules were systematically absent in those patients who had been investigated ophthalmologically (17/30).
Similar(48)
We have systematically searched for genes that are consistently absent in genomes that do not code for selenoproteins but present in those that do.
It was especially difficult interpreting absence of information, since medical records are not written systematically denying absent phenomena.
Although individual disease proteins have been widely predicted, computational methods are still absent for systematically investigating disease-related protein complexes.
We then systematically searched for genes specifically absent from Xp_G6 and present in the other genomes (supplementary table S7, Supplementary Material online).
Compared to Table 1 which is a more typical way of differentiating concepts related to competing demands the conceptualization of Table 3 indicates systematically which features are present (and absent) when describing a specific competing demand.
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