Y T Thathachari
Articles written in Proceedings – Section A
Volume 37 Issue 1 January 1953 pp 41-62
It is shown that ideally Bragg reflections can occur successively from two surfaces only if they form parts of the same sphere, a result shown to be sufficient (but not necessary) in an earlier publication. However, if the aperture radius and the size of the object are small compared to the radius of curvature of the reflecting surfaces (such that fourth and higher power of their ratios are less than (10−6), then the combination will work even with aspherical surfaces, provided the two reflectors are surfaces of revolution about a common axis and they are both concave reflectors having the same vertex radius of curvature and are separated by a distance equal to twice this radius. If a combination of two such mirrors are used, and
Volume 77 Issue 3 March 1973 pp 99-129
The molecule crystallizes in spacegroup P21 with two molecules per unit cell. The unit cell dimensions are
The bond lengths and angles of the amino acid grouping are consistent with values in other amino acids. The structural parameters of the aromatic system are very similar to those of noradrenaline and dopamine hydrochlorides. The crystal structure is dominated by a three-dimensional intermolecular hydrogen bonding system. The molecular conformation is different from that displayed by any other aromatic amino acid or peptide whose crystal structure is known.