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Belen Jimenez M.,University of Salamanca | Alcazar V.,Politechnique University of Madrid | Pelaez R.,University of Salamanca | Sanz F.,University of Salamanca | And 2 more authors.
Organic and Biomolecular Chemistry | Year: 2012

Urea receptor 1 based on two (1-amino-8-amido-3,6-dichloro)carbazole units shows a strong association with dicarboxylate anions such as oxalate, malonate and succinate guests through multiple hydrogen bonds from the carbazole, urea and amide NH groups. 1H NMR complexation studies exhibit high values of association constants in DMSO-d 6. X-ray structures of the 1:1 complexes of 1 with oxalate and malonate as their ditetrabutylammonium salts were obtained. A modelling study of the complex of receptor 1 with succinate (as its diTBA salt) showed a more reduced geometric complementarity than its homologue malonate. © The Royal Society of Chemistry 2012. Source


Perez J.,Politechnique University of Madrid | Aragon C.,Politechnique University of Madrid | Rabadan M.,Higher Sports Council | Navarro E.,Politechnique University of Madrid | Sampedro J.,Politechnique University of Madrid
Assistive Technology Research Series | Year: 2010

Purpose: To study the relationship between individual heart rate and velocity during wheelchair basketball (WB) competition depending players' functional classification (FC). Methods: Two highly trained players were monitored using a heart rate (HR) monitor during one period of high - level competition match (Eurocup Finals). Physical strain was evaluated from personal percentage of HR (%HRR). At the same time, bidimensional photogrammetry techniques were applied to competition video images and used for kinematic analysis of the players' movement. 2D coordinates obtained from every player-wheelchair system (one-point mechanical model) respect to a defined inertial reference system were calculated two times per second. Results: For player 1 (class 3 FC, poliomyelitis both legs) mean (± SD) and maximum HRR (%) were 85,5 (±6,1) and 98,4 and for velocity (m/s) were 1,6 (±0,7) and 3,7. For player 2 (class 1 FC, complete spinal injury D5 level) mean and maximum HRR were 75,4 (±16,0) and 95,8 and for velocity were 1,3 (±0,6) and 2,9. Pearson correlation coefficient between HRR and velocity was r=0,21 (p<0.05) for player 1 and r=0,06 (p=0.48) for player 2. Conclusion: HRR correlates velocity for player 1, but not for player 2. Higher data dispersion in player 2 for this variable seems to be affected by type of disability/functional classification. © 2010 The authors and IOS Press. All rights reserved. Source

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