Violin timbre and the picket fence
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Spectroscopic investigations into the binding of hydrogen sulfide to synthetic picket-fence porphyrins.
The reversible binding of hydrogen sulfide (H2S) to hemeprotein sites has been attributed to several factors, likely working in concert, including the protected binding pocket environment, proximal hydrogen bond interactions, and iron ligation environment. To investigate the importance of a sterically-constrained, protected environment on sulfide reactivity with heme centers, we report here the...
متن کاملA triazole-bearing picket fence type nickel porphyrin as a cyanide selective allosteric host.
A triazole-bearing picket fence type nickel porphyrin (1) has been synthesized as a host compound for anion binding. Among the various anionic species examined, cyanide was the only one that affected a spectral change of 1. Moreover, 1 exhibited strong homotropic positive allosterism against cyanide binding due to an electronic effect as well as multiple hydrogen bonds formed between cyanide an...
متن کاملMS 15 P 06 Preparation , Spectroscopic and Structural characterization of the hexa - coordinate , high - spin iron ( III ) carbonato « picket fence » porphyrin complex
24 European Crystallographic Meeting, ECM24, Marrakech, 2007 Page s168 Acta Cryst. (2007). A63, s168 MS15 P06 Preparation, Spectroscopic and Structural characterization of the hexa-coordinate, high-spin iron(III) carbonato « picket fence » porphyrin complex Mondher Dhifet, Mohamed Salah Belkhiria et Habib Nasri, Laboratoire de Physico-Chimie des Matériaux, Faculté des Sciences de Monastir, Aven...
متن کاملModels for Cooperative Oxygen Binding in Hemoglobin
Equilibrium measurements of oxygen binding by 0 iron(II) and cobalt(II) picket fence porphyrins exhibit p^2, ΔΗ°, and AS° values close to those of myoglobin and cobalt myoglobin respectively. In contrast the CO affinities of simple iron(II) porphyrins are much greater than those of the hemoproteins, hemoglobin (Hb) and myoglobin (Mb). This difference is apparently caused by distal residues in H...
متن کاملViolin Timbre Space Features
Steps towards the development of a violin teaching aid which is based on violin pedagogy, sound analysis, and comparison of beginner and good player recordings was presented in [1]. The relationship between timbre and playing technique has been explored and five main beginner faults have been determined. Briefly, the tone fault categories are onsets, offsets, amplitude, unevenness and asymmetry...
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