Avarietyof?uorescentandluminescentmaterialsintheformofmolecules,their complexes,andnanoparticlesareavailableforimplementationasreportingunits intosensingtechnologies. Increasingdemandsfromtheseapplicationareasrequire developmentofnew?uorescencereportersbasedonassociationandaggregationof ?uorescencedyesandontheirincorporationintodifferentnanostructures. Inter- tionsbetweenthesedyesandtheirincorporatingmatricesleadtonewspectroscopic effectsthatcanbeactivelyusedforoptimizingthesensordesign. Oneofthese effects is a spectacular formation of J-aggregates with distinct and very sharp excitationandemissionbands. Byincorporationintonanoparticles,organicdyes offer dramatically increased brightness together with improvement of chemical stabilityandphotostability. Moreover,certaindyescanformnanoparticlesth- selvessothattheirspectroscopicpropertiesareimproved. Semiconductorquantum dotsaretheothertypeofnanoparticles thatpossessuniqueandveryattractive photophysicalandspectroscopicproperties. Manyinterestingandnotfullyund- stoodphenomenaareobservedinclusterscomposedofonlyseveralatomsofnoble metals. Inconjugatedpolymers,strongelectronicconjugationbetweenelementary chromophoricunitsresultsindramaticeffectsinquenchingandinconformati- dependentspectroscopicbehavior. Possessingsuchpowerfulanddiversearsenaloftools,wehavetoexplorethem innovelsensingandimagingtechnologiesthatcombineincreasedbrightnessand sensitivityinanalytedetectionwithsimplicityandlowcostofproduction. The present book overviews the pathways for achieving this goal. In line with the discussion on monomeric ?uorescence reporters in the accompanying book (Vol. 8ofthisseries),aninsightfulanalysisofphotophysicalmechanismsbehind the ?uorescence response of composed and nanostructured materials is made. Based on the progress in understanding these mechanisms, their realization in differentchemicalstructuresisoverviewed. vii viii Preface Demonstratingtheprogressinaninterdisciplinary?eldofresearchanddev- opment,thisbookisprimarilyaddressedtospecialistswithdifferentbackground- physicists, organic and analytical chemists, and photochemists - to those who developandapplynew?uorescencereporters. Itwillalsobeusefultospecialists inbioanalysisandbiomedicaldiagnostics. Kyiv,Ukraine AlexanderP. Demchenko June2010 Contents PartI GeneralAspects NanocrystalsandNanoparticlesVersusMolecularFluorescent LabelsasReportersforBioanalysisandtheLifeSciences: ACriticalComparison ...3 UteResch-Genger,MarkusGrabolle,RolandNitschke, andThomasNann OptimizationoftheCouplingofTargetRecognition andSignalGeneration ...41 AnaB. Descalzo,ShengchaoZhu,TobiasFischer,andKnutRurack CollectiveEffectsIn?uencingFluorescenceEmission ...107 AlexanderP. Demchenko PartII EncapsulatedDyesandSupramolecularConstructions FluorescentJ-AggregatesandTheirBiologicalApplications ...135 MykhayloYu. LosytskyyandValeriyM. Yashchuk Conjugates,Complexes,andInterlockedSystems BasedonSquarainesandCyanines ...159 LeonidD. Patsenker,AnatoliyL. Tatarets,OleksiiP. Klochko, andEwaldA. Terpetschnig PartIII Dye-DopedNanoparticlesandDendrimers Dye-DopedPolymericParticlesforSensingandImaging ...193 SergeyM. Borisov,TorstenMayr,Gu..nterMistlberger,andIngoKlimant ix x Contents Silica-BasedNanoparticles:DesignandProperties ...229 SongLiang,CarrieL. John,ShupingXu,JiaoChen,YuhuiJin, QuanYuan,WeihongTan,andJuliaX. Zhao LuminescentDendrimersasLigandsandSensors ofMetalIons ...2 53 GiacomoBergamini,EnricoMarchi,andPaolaCeroni ProspectsforOrganicDyeNanoparticles ...285 HiroshiYao PartIV LuminescentMetalNanoclusters Few-AtomSilverClustersasFluorescentReporters ...307 IsabelD?'ezandRobinH. A. Ras LuminescentQuantumClustersofGoldasBio-Labels ...333 M. A. HabeebMuhammedandT. Pradeep PartV ConjugatedPolymers Structure,EmissiveProperties,andReportingAbilities ofConjugatedPolymers ...357 MaryA. Reppy OpticalReportingbyConjugatedPolymers viaConformationalChanges ...389 RozalynA. SimonandK. PeterR. Nilsson FluorescenceReportingBasedonFRETBetweenConjugated PolyelectrolyteandOrganicDyeforBiosensorApplications ...417 Kan-YiPuandBinLiu Index ...455 PartI GeneralAspects NanocrystalsandNanoparticlesVersus MolecularFluorescentLabelsasReporters forBioanalysisandtheLifeSciences: ACriticalComparison UteResch-Genger,MarkusGrabolle,RolandNitschke,andThomasNann Abstract At the core of photoluminescence techniques are suitable ?uorescent labels and reporters, the spectroscopic properties of which control the limit of detection,thedynamicrange,andthepotentialformultiplexing.

Investigation of the structure and function of biological molecules through spectroscopic methods is a field rich in revealing, clever techniques and demanding experiments. It is most gratifying to see that the basic concepts are applied to more and more complex systems, making feasible the study of the behaviour of whole systems in relation to molecular disturbances. The analytical potential of spectroscopy and spectroscopic imaging enables species identification of bacteria and tissue recognition. Clear opportunities for in vivo applications become apparent in the medical field. The methods developed in biophysics start to generate spin-off in the direction of biotechnology, where in previous years we have seen this happen for biochemical techniques. New directions are manifest. Tools are being developed to investigate the behaviour of single molecules in interaction with their environment. Individual interactions can now be investigated and individual molecules in complexes can be visualized. Processes that were previously unobservable as a result of ensemble averaging can now be investigated on a single molecule level. Completely new information with regard to molecular behaviour is obtained in this way. The insights amaze us and the prospect that this development will continue is exciting. The 8th European Conference on the Spectroscopy of Biological Molecules is proud to have contributed to the dissemination of these new directions. This proceedings book is an appropriate reflection of the progress obtained so far in the spectroscopy of biological molecules.

This volume represents the proceedings of an international symposium on sample preparation, held at the University of Surrey, and jointly organised by the Chromatographic Society and the Robens Institute. The Chromatographic Society is the only international organisation devoted to the promotion of, and the exchange of information on, all aspects of chromatography and related techniques. With the introduction of gas chromatography in 1952, the Hydrocarbon Chemistry Panel of the Hydrocarbon Research Group of the Institute of Petroleum, recognising the potential of this new technique, set up a Committee under Dr S.F. Birch to organise a symposium on "Vapor Phase Chromatography" which was held in London in June 1956. Almost 400 delegates attended this meeting and success exceeded all expectation. It was to afford discussion of immediately apparent that there was a need for an organised forum development and application of the method and, by the end of the year, the Gas Chromatog raphy Discussion Group had been formed under the Chairmanship of Dr A.T. James with D.H. Desty as Secretary. Membership of this Group was originally by invitation only, but in deference to popular demand, the Group was opened to all willing to pay the modest sub scription of one guinea and in 1957 A.J.P. Martin, Nobel Laureate, was elected inaugural Chairman of the newly-expanded Discussion Group."

The development of contemporary molecular biology with its growing tendency toward in-depth study of the mechanisms of biological processes, structure, function, and identification of biopolymers requires application of accurate physicochemical methods. Electrophoresis occupies a key position among such methods. A wide range of phenomena fall un der the designation of electrophoresis in the literature at the present time. One common characteristic of all such phenomena is transport by an elec tric field of a substance whose particles take on a net charge as a result of interaction with the solution. The most important mechanisms for charge generation are dissociation of the substance into ions in solution and for mation of electrical double layers with uncompensated charges on particles of dispersed medium in the liquid. As applied to the problem of separation, purification, and analysis of cells, cell organelles, and biopolymers, there is a broad classification of electrophoretic methods primarily according to the methodological charac teristics of the process, the types of supporting media, etc. An extensive literature describes the use of these methods for the investigation of differ ent systems. A number of papers are theoretical in nature. Thus, the mi croscopic theory has been developed rather completely 13] by considering electrophoresis within the framework of electrokinetic phenomena based on the concept of the electrical double layer."

Mass spectrometry underwent dramatic changes during the decade of the 1980s. Fast atom bombardment (F AB) ionization, developed by Barber and coworkers, made it possible for all mass spectrometry laboratories to analyze polar, highly functionalized organic molecules, and in some cases ionic, inorganic, and organometallic compounds. The emphasis of much of this work was on molecular weight determination. Parallel with the development of ionization methods (molecular weight mass spectrometry) for polar biological molecules, the increased mass range of sector and quadrupole mass spectrometers and the development of new instruments for tandem mass spectrometry fostered a new era in structural mass spectrometry. It was during this same period that new instrument technologies, such as Fourier transform ion cyclotron resonance, radio frequency quadrupole ion trap, and new types of time-of-flight mass spectrometers, began to emerge as useful analytical instruments. In addi tion, laser methods useful for both sample ionization and activation became commonplace in almost every analytical mass spectrometry laboratory. In the last 5 years, there has been explosive growth in the area of biological mass spectrometry. Such ionization methods as electrospray and matrix-assisted laser desorption ionization (MALDI) have opened new frontiers for both molecular weight and structural mass spectrometry, with mass spectrometry being used for analysis at the picomole and even femto mole levels. In ideal cases, subfemtomole sample levels can be successfully analyzed. Sample-handling methods are now the limiting factor in analyz ing trace amounts of biological samples.

UV-VIS spectroscopy is one of the oldest methods in molecular spectroscopy. The definitive formulation of the Bouguer-Lambert Beer law in 1852 created the basis for the quantitative evaluation of absorption measurements at an early date. This led firstly to colorimetry, then to photometry and finally to spectrophotometry. This evolution ran parallel with the development of detectors for measuring light intensities, i.e. from the human eye via the photo element and photocell, to the photomultiplier and from the photo graphic plate to the present silicon-diode detector both of which allow simultaneous measurement of the complete spectrum. With the development of quantum chemistry, increasing atten tion was paid to the correlation between light absorption and the structure of matter with the result that in recent decades a number of excellent discussions of the theory of electronic spectroscopy (UV-VIS and luminescence sp, ctroscopy) have been published. Consequently, this extremely ivteresting aspect of molecular spec troscopy has dominated the teaching of the subject both in my own lectures and those of others. However, it is often overlooked that, in addition to the theory, applications of spectroscopic methods are of particular interest to scientists. For this reason, a lecture series about electronic spectroscopy given in the Institute for Physical Chemistry at the Heinrich-Heine-University in Dusseldorf was supplemented by one about "UV-VIS spectroscopy and its applications." This formed the basis of the present book."

Modern liquid column chromatography (LC) has developed rapidly since 1969 to become a standard method of separation. If the statisticians are to be believed, the recent growth of LC has been the most specta cular development in analytical chemistry and has not yet abated be cause its vast potential for application remains to be fully exploit ed. Significant factors contributing to this continued rise are the simplicity and low cost of the required basic equipment and the rela tive ease of acquiring and interpreting the data. Unfortunately, in LC, as so often in the field of analytical chemistry, the available commercial instruments are frequently far more complicated - and consequently far more expensive - than is nec essary for routine application. Therein also lies the risk of propa gating a "black box" philosophy that would be particularly detrimen tal to chromatography. Moreover, it appears to have been forgotten, as was done previously with gas chromatography, that inadequate sep aration by a column can be remedied only with great difficulty, if at all, by electronic means. Also, whether the capillary columns recent ly advocated with great enthusiasm for LC will fulfill the expecta tions of their proponents is highly questionable unless someone comes up with some new and revolutionary ideas."

This volume contains the proceedings of the Eighth International Symposium on Cyclodextrins, held in Budapest, Hungary, March 31-April 2, 1996. The 147 papers collected here are milestones in the exponentially increasing cyclodextrin literature, and represent a summary of the last two years' achievement in this field, with applications in such diverse disciplines as pharmaceuticals, food, cosmetics, textiles, plastics, and chromatography. Some highlights: lipophilicity profiles of cyclodextrins by computer molecular graphics; recent toxicological studies on cyclodextrins; Buckminsterfullerene/cyclodextrin complexes; hydroxypropyl-beta-cyclodextrin; pharmacokinetics and toxicology; peracylated cyclodextrins as drug carriers; cyclodextrins in nasal drug delivery; textile fibre surface modification by a reactive cyclodextrin; cyclodextrin-containing fabric care products; drug targeting by cyclodextrin-dimers for photodynamic cancer therapy; cyclodextrins in ophthalmologic drugs; new cyclodextrin derivatives and their potentials. Audience: This book will be of interest to researchers whose work involves pharmaceuticals, food chemicals and flavours, food additives, chromatographic methods, and biotechnology, as well as fundamental cyclodextrin research.

Major advances in instrumentation and technology have made high-performance liquid chromatography (HPLC) a pervasive tool in virtually all areas of chemical and biomedical research today. Despite HPLC's enormous growth, technical problems still bedevil most users at least occasionally. Based on their immensely successful short courses, Dolan and Snyder's landmark new book --Troubleshooting LC Systems--now makes available to every practicing chromatographer the authors' wealth of expertise from years of hands-on troubleshooting of real-world LC problems--problems that routinely cause crises and unproductive downtime in nearly every lab. Believing that successful troubleshooting requires an understanding of the basics, Dolan and Snyder open by setting forth all the fundamental principles of LC operation, then move on to a microscopic description of all the elements of LC devices, to lay out their optimal preventive maintenance routines, and ultimately to offer an unprecedentedly thorough treatment of each and every facet of troubleshooting.Displaying a special tutorial mastery--honed to a fineness during their ongoing teaching and consulting activities, and a well-received feature column in LC Magazine--the book's chapters cover: automation and robotics * approaches to troubleshooting * reactions of samples * basic separation techniques * valves, tubing, syringes * band broadening and tailing * preventive maintenance * column packing and flushing * individual LC modules * troubleshooting principles * reagents and buffering * specific problems in separation * ghost and vacancy peaks * quantitation and calibration * pumps, seals, and pistons * gradient elution problems * column composition * concentration and blockages * sample cleanup * temperature and mixing effects * detectors and recorders * column packing and flushing. In short, Dolan and Snyder's eminently practical new guide to Troubleshooting LC Systems is an essential laboratory handbook--one that empowers expert and novice chromatographer alike to solve every sort of practical laboratory problem on a day-to-day basis. No one using an LC system should be without it

This is the second of three volumes of Methods in Molecular Biology that deal with Physical Methods of Analysis. The first of these, Spectroscopic Methods and Analyses dealt with NMR spec troscopy, mass spectrometry, and metalloprotein techniques, and the third will cover X-ray crystallographic methods. As with the first volume. Microscopy, Optical Spectroscopy, and Macroscopic Techniques is intended to provide a basic understand ing for the biochemist or biologist who needs to collaborate with spe cialists in applying the techniques of modern physical chemistry to biological macromolecules. The methods treated in this book fall into four groups. Part One covers microscopy, which aims to visualize individual molecules or complexes of several molecules. Electron microscopy is the more familiar of these, while scanning tunneling microscopy is a new and rapidly developing tool. Methods for determining the shapes and sizes of molecules in solution are described in Part Two, which includes chapters on X-ray and neutron scattering, light scattering, and ult- centrifugation. Calorimetry, described in Part Three, provides the means to monitor processes involving thermodynamic changes, whether these are intramolecular, such as conformational transition, or the interactions between solutes or between a solute and its sol vent. Part Four is concerned with optical and infrared spectroscopy and describes applications ranging from the measurement of protein concentration by UV absorbance to the analysis of secondary struc ture using circular dichroism and Fourier-transform infrared spec troscopy.

The first of a two volume set, Volume 12 provides a long-awaited compilation of NMR theory to paramagnetic molecules. International experts report the latest developments in NMR methodology as applied to strongly relaxed and shifted resonances, detail the theoretical aspects of paramagnetic shift and relaxation, and discuss the interpretive bases of these molecular properties in relation to the structure and function of various paramagnetic molecules.

In 1976, on the occasion of the Centennial of the Ameri can Chemical Society, H. A. RESrnG and C. G. WADE organized an international symposium on magnetic resonance in collo1d and in terface science which brought together a large number of scien tists from the United States and from abroad. The aim of this symposium was to include all experimental inorganic, organic and biochemical systems in which molecules are bound to interfaces and to show the contribution of various techniques based on ma gnetic resonance to the knowledge of these systems. This ambi tious program resulted into a very interesting gathering that initiated a more interdisciplinary approach to the problem of interfaces. Because of the success of this symposium it was sug gested that a similar meeting should be organized in Europe within the next three years. Professor J. FRAISSARD accepted this task but, conside ring the rapid developments in the theory and in the applica tions of the magnetic resonance spectroscopies, the organ1z1ng committee decided to arrange the meeting to be held in MENTON (France) in two parts, the first being a School and the second the Symposium proper. The former was' intended to review and to teach theoretical aspects as well as to discuss the experimental results derived from these advanced methods; the Symposium was to be for the discussion of the latest results at the highest level."

Published as a companion to Volume 12, the current volume presents the latest advances in electron paramagnetic resonance of iron proteins, metalloproteins, and free radicals. The book features a diskette containing programs for iron ERP spectral simulation and ENDOR analyses.

In vivo nuclear magnetic and electron spin resonance spectroscopy is concerned, inter alia, with the noninvasive observation of metabolic changes in living systems, including animals and humans. Typically, the physiologi cal (or pathological) state of an organ or tissue is monitored. This multi faceted approach was developed during the 1980s. It is still a research technique, but will undoubtedly become a clinical tool. We are proud to present this volume (the eleventh of our series) in which some of the pioneers in this area summarize their contributions and review related literature. Bolinger and Lenkinski describe a variety of localization methods suitable for clinical applications of NMR spectroscopy. Schleich, Caines, and Rydzewski summarize their contributions to approaches involving off-resonance rotating frame relaxation and critically compare these with other NMR techniques that may yield similar information. Chang and James outline their approach and share their experience with the technical aspects 1 31 of H and P NMR spectroscopy and spatially localized spectroscopy in studies of brain ischemia. Sodium plays an important role in living systems, a key aspect being the large gradient between intra- and extracellular concentrations of sodium that is maintained by a variety of transport mechanisms. Miller and Elgavish give us a comprehensive review of an important research tool in this 23 area- Na NMR spectroscopy as aided by shift reagents.

The combination of solid materials of different structural dimensionality with atomic or molecular guest species via intercalation processes represents a unique and widely variable low temperature synthesis strategy for the design of solids with particular composition, structure and physical properties. In the last decade this field has experienced a rapid development and represents now an established specific domain of solid state research and materials science. Substantial progress has been made with respect to an understanding of the complex relationship between structure, bonding, physical properties and chemical reactivity since the first volume on the subject appeared in this series in 1979 (Intercalated Layered Materials, F. Levy, ed.). The purpose of this volume is to present a survey on progress and per spectives based on the treatment of a series of major areas of activities in this field. By the very nature of its subject this monograph has an interdisciplinary character and addresses itself to chemists, physicists and materials scien tists interested in intercalation research and related aspects such as design and characterization of complex materials, low temperature synthesis, solid state reaction mechanisms, electronic/ionic conductivity, control of electronic properties of solids with different structural dimensionality and application of intercalation systems. Several chapters have been devoted to specific groups of host lattices.

It is refreshing to find a book treating alkaloid analysis with all the latest techniques such as inverse-detected two dimensional NMR, GC/MS, and HPLC associated techniques. There have been many developments in the field of alkaloid analysis since the 1950s, not the least of which are the various powerful spectroscopic methods, which dominate this volume. Included also are the various aspects of tobacco alkaloids and analysis in various situations. The complexities of sampling and analysis in tobacco smoke is explained. Analysis of alkaloids produced by tobacco root cell cultures is included, while genetic and chemical analysis is described for "Papaver," a plant of considerable medicinal significance.

"Provides analytical chemists and biomedical scientists with an excellent summary of progress...This is a book that can be recommended to all analytical scientists interested in fluorimetry." (Analytical Chimica Acta) "This is a useful overview and gives the nonspecialist a feeling for the advantages and limitations of the methods. Overall this book is a worthwhile read and a good source of references." (TRAC)
The book is divided into chapters on new methods, new appli- cations, fluorescence immunoassays, fluorometric analysis and fluorescence spectroscopy in biomedical sciences. Specific topics are fluorescence spectroscopy using synchrotron radiation, picosecond fluorescence spectroscopy, fluorescence microscopy, fluorescence scattering by synthetic polymers, fluorescence immunoassays, fluorescence for environmental monitoring, fluorescence in flow injection analysis, hydro-geological studies, fluorescence of proteins, lipids and membranes, cell fluorescence, calcium transients.

Nuclear magnetic resonance spectroscopy, which has evolved only within the last 20 years, has become one of the very important tools in chemistry and physics. The literature on its theory and application has grown immensely and a comprehensive and adequate treatment of all branches by one author, or even by several, becomes increasingly difficult. This series is planned to present articles written by experts working in various fields of nuclear magnetic resonance spectroscopy, and will contain review articles as well as progress reports and original work. Its main aim, however, is to fill a gap, existing in literature, by publishing articles written by specialists, which take the reader from the introductory stage to the latest development in the field. The editors are grateful to the authors for the time and effort spent in writing the articles, and for their invaluable cooperation. The papers presented here are condensed versions of the main contributions to the 7th Colloquium on Nuclear Magnetic Resonance Spectroscopy, which was made possible by the generous support of the Freunde der Aachener Hoch schule (FAHO). The RWTH is indebted to the FAHO and to all the participants who contributed to the success of the Colloquium."

Oxidation and removal of atmospheric constituents involve complex sequences of reactions which can lead to the production of photo-oxidants such as ozone. In order to understand and model these complex reaction sequences, it is necessary to have a comprehensive understanding of reaction mechanisms and accurate estimates of kinetic parameters for relevant gas-phase atmospheric reactions. This book presents recent advances in the field and includes the following topics: e.g. the oxidation of simple organic compounds, NOx kinetics and mechanisms, OH radical production and rate constants for the OH attack on more complex organic compounds, peroxy and alkoxy radical reactions, photo-oxidation of aromatic and biogenic compounds, and the interaction between radical species.

One of the most important techniques for determining the atomic structure of a material is X-ray diffraction. One of the great problems of the technique, however, is the fact that only the intensity of the diffraction pattern can be measured, not its phase. The inverse problem, of determining the structure from the pattern thus contains ambiguities that must be resolved by other means. Quantitative X-ray analysis provides one way to resolve this phase problem: mixing the material in question with a material of known structure yields interferences that can be analyzed to yield the unknown phases. Invented in 1916, but little used at the time, the technique has seen a recent revival due to the development of extremely precise X-ray diffractometers coupled with powerful computers.

The range at which a weapon has been fired is an important measurement for the reconstruction of firearms offenses (murder, suicide, accident). All changes caused by a shot and which vary according to the distance from the weapon are suitable in principle for determining this distance. However, some procedures are very elegant in theory but hardly applicable in practice. The constructions of ammunition and the sequence of events during a shot are dealt with first as this knowledge forms a basis for understanding the various methods. \ The individual zones (classes) of firing distances (contact shot, intermediate shot, distance shot) are described. In this connection, the morphological methods for determining the firing distance are discussed. From the shape and size of the powder residue distribution (soot stains, powder tattooing) and with the knowledge of the weapon and ammunition, the distance from the target can be elucidated. In this chapter, the methods of making an invisible distribution visible are also dealt with. In order to determine the range of the shot from the appearance of the wound no complicated apparatus is necessary. One can judge with the naked eye. These procedures have a great advantage over the methods discussed in the following chapter in that they give stronger proof. They are more vivid and convincing for the uninitiated (judge or jury) than abstract measurements obtained by scientific devices.

This book is intended to collect in one place as much information as possible on the use of EPR spectroscopy in the analysis of systems in which two or more spins are magnetically coupled. This is a field where research is very active and chemists are elbow-to-elbow with physicists and biologists in the forefront. Here, as in many other fields, the contributions coming from different disciplines are very important, but for active researchers it is sometimes difficult to follow the literature, due to differences in languages, and sources which are familiar to, e. g. , a physicist, are exotic to a chemist. Therefore, an effort is needed in order to provide a unitary description of the many different phenomena which are collected under the title. In order to define the arguments which are treated, it is useful to state clearly what is not contained here. So we do not treat magnetic phenomena in conductors and we neglect ferro- and antiferromagnetic resonance. The basic foundations of EPR spectroscopy are supposed to be known by the reader, while we introduce the basis of magnetic interactions between spins. In the first two chapters we review the foundations of exchange interactions, trying to show how the magnetic parameters are bound to the electronic structure of the interacting centers.

The increasing interest in NMR spectroscopy of what in some confer ences in this field is commonly termed "other nuclei" is unmistakable. Chemists and biologists who employ NMR spectroscopy to study their problems have, however, been somewhat reluctant to study nuclei with electric quadrupole moments. These nuclei frequently give rise to broad NMR signals, sometimes too broad to be detectable with ordinary high resolution NMR spectrometers. Spectrometers that could cope with broad NMR signals of low intensity, "wide-line" spectrometers, have been available since the mid 1950: s but it appears that most of these instruments ended up in physical laboratories where the research was primarily directed towards solid state problems. The study of quadrupolar nuclei can provide unique and very valuable information on a variety of physico-chemical and biological systems. For one thing the relaxation of quadrupolar nuclei is in many ways easier to interpret than the relaxation of non-quadrupolar nuclei, since the former is in many cases caused by purely intramolecular interactions modulated by the molecular motion. Studies of quadrupolar relaxation have therefore furnished important information about molec ular reorientation and association in liquids and have played - and will certainly play for many years - an important role in testing new theoretical models of molecular motion in liquids."

Localization 1. C.S. Bosch, J.J.H. Ackerman, St. Louis, MO/USA SurfaceCoil Spectroscopy 2. P. Styles, Oxford, UK Rotating Frame Spectroscopyand Spectroscopic Imaging 3. P.A. Bottomley, Schenectady, NY/USA DepthResolved Surface Coil Spectroscopy (Dress) 4. R.J. Ordidge, J.A. Helpern, Detroit, MI/USA Image Guided Volume Selective Spectroscopy: A Comparison of Techniques for In-Vivo 31P NMR Spectroscopy of Human Brain 5. M. Decorps, D. Bourgeois, Grenoble, France Localized Spectroscopy Using Static Magnetic Field Gradients: Comparison of Techniques 6. J.A. den Hollander, P.R. Luyten, Ad J.H. Marien, Best, The Netherlands 1H NMR Spectroscopy and Spectroscopic Imaging of the Human Brain Spectral Editing and Kinetic Measurements 7. H.P. Hetherington, Birmingham, AL/USA Homo- and Heteronuclear Editing in Proton Spectroscopy 8. D. Freeman, R. Hurd, Fremont, CA/USA Metabolite Specific Methods Using Double Quantum Coherence Transfer Spectroscopy 9. B.A. Berkowitz, Research Triangle Park, NC/USA Two-Dimensional Correlated Spectroscopy In-Vivo 10. G. Navon, Tel Aviv, Israel; T. Kushnir, Tel Hashomer, Israel; N. Askenasy, O. Kaplan, Tel Aviv, Israel Two-Dimensional 31P-1H Correlation Spectroscopy in Intact Organs and Their Extracts 11. M. Rudin, A. Sauter, Basel, Switzerland Measurement of Reaction Rates In Vivo Using Magnetization Transfer Techniques