PLAGIHEDRAL CRYSTAL
\plˌad͡ʒɪhˈiːdɹə͡l kɹˈɪstə͡l], \plˌadʒɪhˈiːdɹəl kɹˈɪstəl], \p_l_ˌa_dʒ_ɪ_h_ˈiː_d_ɹ_əl k_ɹ_ˈɪ_s_t_əl]\
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[Gr.] As quartz, which commonly takes the form of a six-sided prism terminated by a pyramid. In some cases the solid angles at the junction are replaced by secondary planes obliquely placed ; the form of crystal is then said to be plagihedral, and may be right-handed or left-handed according to the direction of the secondary planes. This difference in the form of the crystals corresponds to a difference in their action on polarized light.
By Henry Percy Smith
Word of the day
Platidiam
- An inorganic water-soluble platinum complex. After undergoing hydrolysis, it reacts DNA produce both intra interstrand crosslinks. These crosslinks appear to impair replication and transcription of DNA. The cytotoxicity cisplatin correlates with cellular arrest in G2 phase cell cycle.