1,224 research outputs found
NMR conformational study of the lanthanide(III) complexes of DOTA in aqueous solution
No full textMarques, M.P.M. ; Geraldes, C.F.G.C. ; Sherry, A.D. ; Merbach, A.E. ; Powell, H. ; Pubanz, D. ; Aime, S. ; Botta, M
Solvent exchange and Jahn-Teller inversion on Cu2+ in water and N,N'-dimethylformamide: a high pressure 17O NMR study
No full textD. Hugh Powell, Patrick Furrer, Pierre-Andre Pittet, Andre E. Merbac
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Photophysical aspects of Lanthanide(III) complexes
No full textThere has been a huge increase in the use of MRI and contrast agents in medicine in recent years as evidenced by a big increase in the number of hospitals with MRI machines and the ever-increasing number of examinations using contrast agents. Contrast agents have revolutionized the use of Magnetic Resonance Imaging (MRI) in medical diagnostics, allowing doctors to distinguish between normal and abnormal tissues and ultimately improving prognosis for the patient.
This monograph covers all aspects of production, use, operating mechanisms and theory of these diagnostic agents, used to produce high contrast images in MRI. It will therefore be unique resource for what is currently a very active domain of research both in universities and in industry.
The Chemistry of Contrast Agents in Medical Magnetic Resonance Imaging is a comprehensive treatise:
* written by the most active scientists in the field of contrast agents for medical MRI - from both university and industrial backgrounds
* covering the topic from every angle from synthesis to safety considerations
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A conversation with Isca Wittenberg
No full textThis paper, based on a conversation with Isca Wittenberg, summarises the dialogue between her and the author and highlights the main points of their discussion, including the observational method, the role of the observer and the influence on clinical practice
Cello techniques and performing practices in the nineteenth and early twentieth centuries
No full textThis thesis comprises a study of cello performance practices throughout the nineteenth century and into the early decades of the twentieth. It is organised in terms of the increasing complexity of the concepts which it examines, as they are to be found in printed and manuscript music, instrumental methods and larger treatises, early recordings, concert reviews and pictures. Basic posture is considered along with different ways of holding the
bow. The development of the tail-pin shows that even when it was widely used, the older posture was still referred to as a model. Some implications for tone quality and tonal
projection are considered in the light of the shape of the arms. Some connections between the cellist's posture and that recommended by etiquette books are explored. The
functionality of the left hand and arm, and the development of modem scale fingerings, show that there was a considerable period of overlap between newer and older practices, with modern scale fingerings evolving over a long period of time. Similarly, views on the function of the right wrist in bowing are shown to change gradually, moving towards a more active upper arm movement with less extreme flexibility of the wrist. Two central expressive techniques especially associated with string playing arc considered in the context of the cello, namely vibrato and portamento. These topics are examined in the light of written indications in music, recommendations in cello treatises, and the practices evidenced in early recordings. The sources for this study can be brought into an overall
framework of a constant dialogue between `theory', as expressed in verbal instructions to the learner, or general a priori reflections about the cello, and `practice', manifested in performing editions and early recordings, or in individual acts of reception. A wide divergence is noted, both between theory and practice in general, and in terms of different styles of playing observable at any one time. It is suggested that tensions between practice
and critical disapproval can be resolved in terms of Lacanian discourse. Several test cases are used in order to compare several different recordings of the same works. The question of the musical character of the cello is discussed in terms of widespread assumptions about its gendered identity. A wide range of sources suggest that this moved from a straightforwardly `masculine' identity expressed through a controlling, elevated eloquence to a less clearly defined one, incorporating the 'feminine', with a greater stress on uninhibited emotional expression. Some performance implications for this change of view are pursued with respect to specific repertoires. Broad conclusions stress the importance of the diversity of performance practices as opposed to unifying generalisations
Recent developments in solvation and dynamics of the lanthanide (III) ions
No full textAbstract -This paper presents recent developments concerning the behaviour of the trivalent lanthanide ions in solution. Counterion complexation, coordinntion numbers and kinetic properties are discussed. Special interest is devoted to the results obtained in aqueous and N,N-dimethylformamide solutions, where the solvent exchange reactions have been characterized at variable temperature and pressure. T h e coordination properties, solvent exchange rates and mechanisms are discussed in terms of electrostatic and steric factors
Temperature measurement under high pressure using commercial platinum resistors
No full textPlatinum resistance thermometry has been used for temperature measurement in situ in a high-pressure vessel up to 360 MPa. Commercially available 100 Omega platinum resistors have been calibrated against pressure for temperatures between -60 and +100 degrees C. A convenient small four-wire electrical connector has been developed for use up to 500 MPa.LCI
Use of high pressure kinetic studies in determining inorganic substitution mechanisms
No full textLCI
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