Academic Press Series in Cognition and Perception: A Series of Monographs and Treatises: Music Cognition focuses on the perception and cognition of music. The book first elaborates on the sense and perception of sound and timbre, consonance, and dissonance. Discussions focus on timbre, consonance and dissonance, sound waves, loudness, localization, music materials, music, cognition, and culture. The text then takes a look at musical scales and melody, including memory for melodic features, scales in other cultures, absolute pitch, Western scales and equal temperament, and alternative accounts. The manuscript ponders on melodic organization, rhythm and organization of time, emotion, and meaning, and cultural contexts of musical experience. Topics include function of music in society, description from within cultures, a cognitive theory of emotion, temporal experience, perception of rhythm, and cross-cultural studies. The book is a dependable reference for music experts and researchers interested in music cognition.

Music Cognition (Academic Press Series in Cognition & Perception)

Arts & Photography

Dowling, W. Jay

Harwood, J.L.

Music

Academic Press

Lipids can usually be extracted easily from tissues by making use of their hydrophobic characteristics. However, such extractions yield a complex mixture of different lipid classes which have to be purified further for quantitative analysis. Moreover, the crude lipid extract will be contami nated by other hydrophobic molecules, e.g. by intrinsic membrane proteins. Of the various types of separation processes, thin layer and column chromatography are most useful for intact lipids. High performance liquid chromatography (HPLC) is also rapidly becoming more popular, especially for the fractionation of molecular species of a given lipid class. The most powerful tool for quantitation of the majority of lipids is gas liquid chromatography (GLC). The method is very sensitive and, if adapted with capillary columns, can provide information with regard to such subtle features as the position or configuration of substitutions along acyl chains. By coupling GLC or HPLC to a radioactivity detector, then the techniques are also very useful for metabolic measurements. Although research laboratories use generally sophisticated analytical methods such as GLC to analyse and quantify lipid samples, chemical derivatie:ations are often used in hospitals. For these methods, the lipid samples are derivatized to yield a product which can be measured simply and accurately-usually by colour. Thus, total triacylglycerol, cholesterol or phospholipid-phosphorus can be quantitated conveniently without bothering with the extra information of molecular species, etc. which might be determined by more thorough analyses. REFERENCES Christie, w.w. (1982) Lipid Analysis, 2nd edn, Pergamon Press, Oxford.

Lipid Biochemistry: An Introduction (International Perspectives on Adult)

Science & Math

Gurr, M.I.

Biological Sciences

Springer

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