898 resultados para 3-18
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The characterization of free base porphyrin 2,3,7,8,12,13,17,18-octakis(hexyl-thio) tetraazaporphyrin (H(2)OHTTAP) and its zinc(II) complexes [Zn(II)OHTTAP] containing eight thioether groups at the beta -pyrrole positions of the macrocycle was reported. Results obtained by cyclic voltammetry and differential pulse voltammetry indicated a five-electron reduction in five steps for each complex. They were oxidized in two single-electron-transfer steps to yield pi -cation radicals and dications and reduced in three single-electron-transfer steps to yield pi -anion radicals, dianions and trianions, respectively. The redox property of H(2)OHTTAP was unusual as compared to porphyrins (PPs) and phthalocyanines (Pcs). Each process was monitored by in situ thin-layer spectroelectrochemistry, which indicated that only the Ligand was electroactive. The existence of the eight hexylthio groups was responsible for the intrastack interactions and enhanced intracolumnar and intercolumnar electron motions, resulting in improved conductivity. Copyright (C) 2001 John Wiley & Sons, Ltd.
Resumo:
采用固相反应法在Ａｌ２Ｏ３－Ｂ２Ｏ３体系中合成了Ａｌ４Ｂ２Ｏ９和Ａｌ１８Ｂ４Ｏ３３两个相关化合物，测定了在两种基质中Ｃｅ３＋，Ｔｂ３＋和Ｃｅ３＋－Ｔｂ３＋的光谱，观察到在两种基质中Ｃｅ３＋的光谱相似，Ｃｅ３＋的发射峰位置在Ａｌ１８Ｂ４Ｏ３３中比Ａｌ４Ｂ２Ｏ９稍有红移。实验表明，Ａｌ１８Ｂ４Ｏ３３将是一种好的发光基质
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Little is known about the developmental trajectory of cortisol levels in preterm infants after hospital discharge.
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Survey map of the Second Welland Canal created by the Welland Canal Company showing the area through Humberstone Township. Identified structures associated with the Canal are the north and south back ditches, Towing Path and spoil banks. Surveyor measurements and notes can be seen in red and black ink and pencil. Local area landmarks include Tram Way to Peat Beds. Roads running parallel to Canal are the Road to Port Colborn and the northern Road Allowance. Roads running parallel to Canal are Road Allowance between the 2nd and 3rd Concession, Road Allowance between the 3rd and 4th Concession. Properties and property owners are noted as follows: J. Thompson, J. Sullivan, J. Leady, John Neff and Peter Neff. Other properties include: Lot No. 27, 3rd Concession, Lot No. 26, 3rd Concession and Lot No. 25, 3rd Concession."Humberstone" - Scale 4 Chs. per Inch
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Pour toute demande de reproduction de contenu se trouvant dans cette publication, communiquer avec l’Association des diplômés de l’UdeM.
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La présente étude longitudinale a pour objectif d’évaluer la stabilité de la relation d’activation père-enfant entre 12-18 mois et 3-5 ans. De plus, nous nous intéressons aux facteurs qui pourraient être associés à la stabilité ou l’instabilité. La situation risquée a été conduite auprès des 39 dyades père-enfant aux deux temps de mesures, soit lorsque l’enfant était âgé entre 12 et 18 mois et lorsqu’il était âgé entre 3 et 5 ans. Le questionnaire d’ouverture au monde ainsi que le questionnaire d’évènements de vie ont été passés aux pères. Les résultats démontrent que seulement 46 % des enfants sont demeurés stables. L’instabilité et la stabilité ne se sont pas révélées associées significativement à aucun des facteurs mesurés.
