GRAVITROPISM
\ɡɹˈavɪtɹˌə͡ʊpɪzəm], \ɡɹˈavɪtɹˌəʊpɪzəm], \ɡ_ɹ_ˈa_v_ɪ_t_ɹ_ˌəʊ_p_ɪ_z_ə_m]\
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The directional growth of organisms in response to gravity. In plants, the main root is positively gravitropic (growing downwards) and a main stem is negatively gravitropic (growing upwards), irrespective of the positions in which they are placed. Plant gravitropism is thought to be controlled by auxin (AUXINS), a plant growth substance. (From Concise Dictionary of Biology, 1990)
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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.