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10 citations found for Agmon, I.

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The Diels-Alder reaction between 11-cyano-1,6-methano[10]annulene and 4-methyl-1,2,4-triazoline-3,5-dione yields the exo and endo isomers of the adduct 2,3,5,5a,9a,10-hexahydro-2-methyl-1,3-dioxo-5,10-etheno-5a,9a-methano-1H-[1,2,4]triazolo[1,2-b]phthalazine-14-carbonitrile (CMAT). CMAT(II) (the crystal of the exo isomer) transforms to CMAT(I) (the crystal of the endo isomer) during a thermally induced phase transition in the solid state. Two modes of transition were observed in crystals of CMAT(II) taken from different batches: a single-crystal-to-single-crystal transition and a single-crystal-to-polycrystal transition. The identification of the factor that determines the mode of transition was based on a structural comparison at room temperature and at circa 380 K, on thermal-motion analyses at both temperatures and on an examination of the defect content using X-ray topography. No substantial differences, concerning these aspects, were detected between crystals from the two batches and the various modes of transition were attributed to different sites of nucleation. A single nucleus at the edge of the crystal plates results in a single-crystal product, while nucleation at holes on the plate surface leads to a polycrystalline material.

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Acta Cryst. (2004). A60, s125
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Acta Cryst. (1984). A40, C104
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The MIR map pf the small ribosomal subunit, constructed at 7.2 Å and extended to 5.5 Å using crystals diffracting to 3 Å, shows morphologies close to the active conformation of these particles and contains elongated dense features traceable as RNA chains as well as globular regions in which folds observed in isolated ribosomal proteins were detected. Surface proteins and selected RNA strands are being located by difference Fourier methods, exploiting the metal cluster attached to them.

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Acta Cryst. (2002). A58, c232
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