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This book is printed on acid-free paper Copyright 2002, Elsevier Science Ltd. First printing 1997 Second printing 2000 All Rights Reserved No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Academic Press An Imprint of Elsevier Science 84 Theobald's Road, London WCIX 8RR, UK http://www.academicpress.com Academic Press An Imprint of Elsevier Science 525 B Street, Suite 1900, San Diego, California 92101^495, USA http: / / www.academicpress.com ISBN 0-12-652840-3 A catalogue record for this book is available from the British Library Typeset by J&L Composition Ltd, Filey, North Yorkshire Printed in Great Britain by The University Press, Cambridge 02 03 04 05 06 07 CU 9 8 7 6 5 4 3 2 1