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Acer tetramerum biological capacity byeloretsk (beloretsk) dividing up drastic evolution explosion-temperature hapency intravalley scattering Ipomoea aquatica Forsk. issue stock latent elastic deformation macro-residual stress merelli Neckargemünd O4-alkylthymine programmer assistant surface potential gradient two-wing building berth vascular sclerosis verbascosides