41. Please refer to Chirality for more information regarding the D-and L-labels. 42. It is important that the chirality of the molecule can be conformational rather than structural. 43. Relative direction and chirality are distinct concepts. 44. The weak interaction is chiral and thus provides a means for probing chirality in physics. 45. This stereogenic atom, but has axial chirality due to restricted rotation ( atropisomerism ). 46. The chirality is introduced into the substrate by influence of enzyme, which is chiral. 47. The absolute stereochemistry of the two stereocenters is controlled by the chirality in the auxiliary. 48. The introduction of chirality at phosphorus appeared of importance for intra-and intermolecular dynamics. 49. DNA could be synthesized for pyrimidine bases in which the chirality of phosphorus was decisive. 50. Chirality , or handedness, determines the polarity of wave propagation ( wave vector ).