Mutual Conformational Adaptation of Both Ligand and Receptor in Antitumor Drug-DNA Complexes.- DNA Drug Interactions studied with Polarized Light Spectroscopy: the DAPI Case.- Drug-DNA Recognition: Sequence Specificity of the DNA Minor Groove Binder Berenil.- Binding of Minor Groove Ligands to Short DNA Segments: Berenil Complexed with d(GCAATTGC)2 and d(GCTTAAGC)2.- The Sequence Specificity of Damage Caused by [125I]-Labelled Hoechst 33258 and UV/IodoHoechst 33258 in Intact Cells and in Cloned Sequences of Purified DNA which differ by a Small Number of Base Substitutions.- Structure and Dynamics of a [1:1] Drug-DNA Complex: Analysis of 2D NMR Data Using Molecular Mechanics and Molecular Dynamics Calculations.- Determination of Distamycin-A Binding Modes by NMR.- Molecular Mechanisms of DNA Sequence Recognition by Groove Binding Ligands: Biochemical and Biological Consequences.- Daunomycin Binding to DNA: from the Macroscopic to the Microscopic.- In Vitro Transcription Analysis of the Sequence Specificity of Reversible and Irreversible Complexes of Adriamycin with DNA.- Quantitative Footprinting Analysis of the Actiomycin D-DNA Interaction.- Structural Requirements for DNA Topoisomerase II Inhibition by Anthracyclines.- Thermodynamic Studies of Amsacrine Antitumor Agents with Nucleic Acids.- Kinetic and Equilibrium Binding Studies of a Series of Intercalating Agents that Bind by Threading a Sidechain Through the DNA Helix.- Aminoacyl-Anthraquinones: DNA-Binding and Sequence Specificity.- The Molecular Basis of Specific Recognition Between Echinomycin and DNA.- Bis-Pyrrolecarboxamides Linked to Intercalating Chromophore Oxazolopyridocarbazole (OPC): Properties Related to the Selective Binding to DNA at Rich Sequences.- Parallel-Stranded Nucleic Acids and their Interaction with Intercalating and Groove Binding Drugs.- Design of Bifunctional Nucleic Acid Ligands.- Sequence-Specific Recognition and CLeavage of Duplex DNA by Derivatized Oligonucleotides.- Bis(Platinum) Complexes. Chemistry, Antitumor Activity and DNA-Binding.- Interaction of Calicheamicin with DNA.- The Effects of Ligand Structure on Binding Mode and Specificity in the Interaction of Unfused Aromatic Cations with DNA.- Modulation of Protein-DNA Interactions by Intercalating and Nonintercalating Agents.- Antitumor Antibiotics Endowed with DNA Sequence Specificity.- Cationic Porphyrin-DNA Complexes: Specificity of Binding Modes.- Complementary Studies on Sequence Specificity in DNA-Antitumor Drugs Interactions.- Uranyl Photofootpring. DNA Structural Changes upon Binding of Mithramycin.- Characteristics of Noncovalent and Covalent Interactions of (+) and (-) Anti-Benzo[a]pyrene Diol Epoxide Stereoisomers of Different Biological Activities with DNA.- Aflatoxin-DNA Binding and the Characterization of Aflatoxin B1-Oligodeoxynucleotide Adducts by 1H NMR Spectroscopy.- Sequence Specific Isotope Effects on the Cleavage of DNA by Radical-Generating Drugs.- Quinolone-DNA Interaction: How a Small Drug Molecule Acquires High DNA Binding Affinity and Specificity.- Mechanisms of DNA Sequence Selective Modifications by Alkylating Agents.- Contrasting Mechanisms for the Sequence Recognition of DNA by(+)- and (-)-CC-1065.- Course of Recognition and Covalent Reactions Between Mitomycin C and DNA: Sequence Selectivity of a Cross-Linking Drug.- Triplex Forming Oligonucleotide Reagents: Rationalization of DNA Site Selectivity and Application in a Pharmaceutical Context.- Experimental Proofs of a Drug's DNA Specificity.

The Twenty Sixth Jerusalem Symposium reflected the high standards of these distinguished scientific meetings, which convene once a year at the Israel Academy of Sciences and Humanities in Jerusalem to discuss a specific topic in the broad area of quantum chemistry and biochemistry. The topic at this year's Jerusalem Symposium was reaction dynamics in clusters and condensed phases, which constitutes a truly interdisciplinary subject of central interest in the areas of chemical dynamics, kinetics, photochemistry and condensed matter chemical physics. The main theme of the Symposium was built around the exploration of the interrelationship between the dynamics in large finite clusters and in infinite bulk systems. The main issues addressed microscopic and macroscopic sol vation phenomena, cluster and bulk spectroscopy, photodissociation and vibrational predissociation, cage effects, interphase dynamics, reaction dynamics and energy transfer in clusters, dense fluids, liquids, solids and biophysical systems. The interdisciplinary nature of this research area was deliberated by intensive and extensive interactions between modern theory and advanced experimental methods. This volume provides a record of the invited lectures at the Symposium.

The Fifteenth Jerusalem Symposium reflected the high standards of the former international scientific meetings, which convene once a year at the Israel Academy of Sciences and Humanities in Jerusalem to discuss a specific topic in the broad area of quantum chemistry and biochemistry. The topic at this year's Jerusalem Symposium was intramo lecular dynamics, a subject of central interest for theoreticians, che mists and biologists. During the last two decades, there has been remarkable pro gress in our understanding of time dependent phenomena. The development and application of the modern techniques of quantum mechanics and sta tistical mechanics to excited-state dynamics and to chemical and biophy sical systems constitutes a fast developing current research area. The main theme of the Symposium was built around a conceptual framework for the elucidation of photophysical and photochemical phenomena in atoms, molecules, van der Waals complexes and clusters, condensed phases, poly mers and biological supermolecules. The interdisciplinary nature of this research field was deliberated by intensive and extensive interactions between scientists from different disciplines and between theory and experiment. This volume provides a record of the invited lectures at the Symposium."

The 25th Jerusalem Symposium represents a most significant highlight in the development and history of these meetings. Living within the decimal system we have celebrated with much pleasure the lath and the 20th Jerusalem Symposia. With this one we experience a feeling of particular satisfaction because 25 years is different from, is more than, two decades and a half. It is a quarter of a century. It seems thus as if we have changed the dimension of our endeavour. In no way do we loose the sense of modesty with respect to the significance of these meetings. For the organizers, however, they do represent a continuity of efforts which we feel happy to have been able to carry out. At this occasion it seems useful to say a few words about the origin of the Jerusalem Symposia and to recall the name of a colleague who played an essential role in their creation and has been a most efficient and devoted co organizer of the seven first of them. This was Professor Ernst Bergmann, one of the most distinguished founders of Israeli Science and a world famous physico-organic chemist.

The Symposium on "Transport through Membranes : Carriers. Channels and Pumps" Inaugurates the third decade of the Jerusalem Symposia. It enlarges substantially their conceptual scope by Introducing a new subject not treated there previously. In fact. It Is a topic particularly well suited for the general object of these International meetings which Is to reassemble In an exhaustive Interdisciplinary discussion chemists. physicists and biologists. theoreticians and experimentalists. The main theme of the Symposium was the presentation and evaluation of the most up-to-date data on the structural and dynamic aspects of transport through membranes within the three main pathways: through carriers. channels and pumps. This goal was fully achieved thanks to the participation of a most outstanding assembly of world's experts In the field. We wish to thank Madame Pullman. the real organizer and mainspring of this meeting. for having composed a most exciting and excellent program and for carrying It out successfully. As the twenty preceding ones this Symposium was held under the auspices of the Israel Academy of Sciences and Humanities and the Hebrew University of Jerusalem. It was sponsored by the Instltut de Blologle Physlco Chimique. Fondatlon Edmond de Rothschild of Paris. We wish to express once again our gratitude to the Baron Edmond de Rothschild for his constant and generous support which makes this continuous endeavour possible.

The Twenty Fourth Jerusalem Symposium reflected the high standards of these distinguished scientific meetings, which convene once a year at the Israel Academy of Sciences and Humanities in Jerusalem to discuss a specific topic in the broad area of quantum chemistry and biochemistry. The topic at this year's Jerusalem Symposium was mode selective chemistry, which constitutes a truly interdisciplinary subject of central interest in the areas of chemical physics, photochemistry and photobiology. The main theme of the Symposium was built around the exploration of the possibility and conditions for non-statistical reaction dynamics in molecules, van der Waals molecules, clusters and condensed phases. The main issues addressed photoselective and coherent excitation modes, bottlenecks for intramolecular vibrational energy redistribution, the consequences of the internal structure of many-atom systems and of rotational vibrational level structure for intramolecular dynamics, bond selective photodissociation, ultrafast chemical clocks for energy disposal, coherent control of photochemical reactions and nonstatistical unimolecular reaction dynamics. The interdisciplinary nature of this research area was deliberated by intensive and extensive interactions between theory and experiment. This volume provides a record of the invited lectures at the Symposium."

Gathering together a number of experts in the world, the 27th Jerusalem Symposium was devoted to the theme of the modelling of biomolecular structures and mechanisms. As a result of recent growth in both importance and audience, the papers contained in this volume present an evaluation of the status of the present knowledge in this field. The main topics covered by this year's Symposium include nucleic acids and their interactions, proteins and their interaction, membranes and their interactions, enzymatic processes and the pharmacological and medical aspects of these subjects. Readers should benefit from the interdisciplinary approach which provides coverage of both theoretical and experimental advances.

Proceedings of the Nineteenth Jerusalem Symposium in Quantum Chemistry and Biochemistry, held in Jerusalem, Israel, May 5-8, 1986

The Twenty Sixth Jerusalem Symposium reflected the high standards of these distinguished scientific meetings, which convene once a year at the Israel Academy of Sciences and Humanities in Jerusalem to discuss a specific topic in the broad area of quantum chemistry and biochemistry. The topic at this year's Jerusalem Symposium was reaction dynamics in clusters and condensed phases, which constitutes a truly interdisciplinary subject of central interest in the areas of chemical dynamics, kinetics, photochemistry and condensed matter chemical physics. The main theme of the Symposium was built around the exploration of the interrelationship between the dynamics in large finite clusters and in infinite bulk systems. The main issues addressed microscopic and macroscopic sol vation phenomena, cluster and bulk spectroscopy, photodissociation and vibrational predissociation, cage effects, interphase dynamics, reaction dynamics and energy transfer in clusters, dense fluids, liquids, solids and biophysical systems. The interdisciplinary nature of this research area was deliberated by intensive and extensive interactions between modern theory and advanced experimental methods. This volume provides a record of the invited lectures at the Symposium.

One of the central problems in the study of the mechanism of DNA-ligand interactions is the existence and nature of sequence specificity with respect to the base pairs of DNA. The presence of such a specificity could be of particular significance because it might possibly mean the involvement of specific genes in the effectiveness of the different drugs. The elucidation of the factors responsible for the specificity could then be important for the development of compounds susceptible to contribute to the control of gene expression and also to the development of rationally conceived, improved new generations of effective and specific chemotherapeutic agents. Important recent achievements, experimental and theoretical, in the analysis of such sequence specificities open prospects for possible rapid progress in this field. The 23rd Jerusalem symposium was devoted to the exploration of these recent achievements in relation to many types of ligand, with special emphasis on antitumor drugs. All major types of interaction, intercalation, groove binding, covalent linking, coordination, have been considered. So was also the effect of the interaction on the structure and properties of the nucleic acids and the relationship between the interaction and biological or pharmacological activities. We feel that this Volume presents a relatively complete up-to-date account of the state of the art in this important field of research.

The 25th Jerusalem Symposium represents a most significant highlight in the development and history of these meetings. Living within the decimal system we have celebrated with much pleasure the lath and the 20th Jerusalem Symposia. With this one we experience a feeling of particular satisfaction because 25 years is different from, is more than, two decades and a half. It is a quarter of a century. It seems thus as if we have changed the dimension of our endeavour. In no way do we loose the sense of modesty with respect to the significance of these meetings. For the organizers, however, they do represent a continuity of efforts which we feel happy to have been able to carry out. At this occasion it seems useful to say a few words about the origin of the Jerusalem Symposia and to recall the name of a colleague who played an essential role in their creation and has been a most efficient and devoted co organizer of the seven first of them. This was Professor Ernst Bergmann, one of the most distinguished founders of Israeli Science and a world famous physico-organic chemist.

Gathering together a number of the best experts in the world, the 27th Jerusalem Symposium was devoted to the theme of the modelling of biomolecular structures and mechanisms. As a result of recent growth in both importance and audience, the papers contained in this volume present a thorough evaluation of the status of the present knowledge in this field. The main topics covered by this year's Symposium include nucleic acids and their interactions, proteins and their interaction, membranes and their interactions, enzymatic processes and the pharmacological and medical aspects of these subjects. Readers will benefit from the interdisciplinary approach which provides an extensive coverage of both theoretical and experimental advances.

The Twenty Fourth Jerusalem Symposium reflected the high standards of these distinguished scientific meetings, which convene once a year at the Israel Academy of Sciences and Humanities in Jerusalem to discuss a specific topic in the broad area of quantum chemistry and biochemistry. The topic at this year's Jerusalem Symposium was mode selective chemistry, which constitutes a truly interdisciplinary subject of central interest in the areas of chemical physics, photochemistry and photobiology. The main theme of the Symposium was built around the exploration of the possibility and conditions for non-statistical reaction dynamics in molecules, van der Waals molecules, clusters and condensed phases. The main issues addressed photoselective and coherent excitation modes, bottlenecks for intramolecular vibrational energy redistribution, the consequences of the internal structure of many-atom systems and of rotational vibrational level structure for intramolecular dynamics, bond selective photodissociation, ultrafast chemical clocks for energy disposal, coherent control of photochemical reactions and nonstatistical unimolecular reaction dynamics. The interdisciplinary nature of this research area was deliberated by intensive and extensive interactions between theory and experiment. This volume provides a record of the invited lectures at the Symposium."

Colloque Weyl I was convened in June 1963 at the Catholic University of Lille to commemorate one hundred years of the study of metal-ammonia solutions. This memorable event, which involved a "single-particle excitation," inspired Gerard Lepoutre to assemble an international group of physicists and chemists to discuss the nature of metal-ammonia solutions. Colloque Weyl II, which took 1969, was initiated as a place at Cornell Universtiy, Ithaca, N.Y. in June "cooperative interaction" between M. J. Sienko, J. L. Dye, J. J. Lagowski, G. Lepoutre and J. C. Thompson. That meeting made it clear that Colloque Weyl should be continued in order to promote the fruitful exchange of ideas set in motion at Lille and at Cornell. Colloque Weyl III came into being as the result of a resolution passed at the Cornell meeting, Tel-Aviv University being the suggested site. The Organizing Committee consisted ofE. D. Bergmann, J. Jortner, J. J. Lagowski, G. Lepoutre, U. Schindewolf and M. J. Sienko, reflecting the international and interdisciplinary aspects of the field.

The Seventeenth Jerusalem Symposium focused on dynamics on surfaces, a subject of interest in the areas of chemistry, physics and material sciences. The Symposium reflected the high standeds of these distinguished scientific meetings, which convene yearly at the Israel Academy of Sciences and Humanities to discuss a specific topic in the broad area of quantum chemistry and biochemistry. Molecule-surface dynamics constitutes a fast developing, current, research area. The main theme of the Symposium was built around a conceptual framework for the elucidation of the chemical and physical aspects of atomic and molecular scattering off surfaces, surface transport, surface reaction dynamics and radiative interactions on surfaces. The interdisciplinary nature of this research area was emphasized by intensive and extensive interactions between scientists from different disciplines and between theory and experiment. HeLd under the auspices of the Israel Academy of Sciences and Humanities and the Hebrew University of JerusaLem, the Seventeenth JerusaLem Symposium was sponsored by the Institut de BioLogie Physico- Chimique (Fondation Edmond de RothschiLd) of Paris. We wish to ex- press our deep thanks to Baron Edmond de Rothschild for his continuous and generous support, which makes him a true partner in this important endeavour. We would aLso like to express our gratitude to the Admi- nistrative Staff of the Israel Academy, and in particular to Mrs. AvigaiL Hyam, for the efficiency and exceLLency of the LocaL arrangements.

th The 16 Jerusalem Symposium debated on one of the most im- portant subjects of modern molecular biology: the nucleic acids. It continued the tradition of gathering the most distinguished experts in the field. Placed under the auspices of the Isra~l Acade~y of Sciences and Humanities and the Hebrew University of Jerusalem it was sponsored by the Institut de Biologie Physico-Chimique (Fondation Edmond de Rothschild) of Paris and the Na~ional Foundation for Cancer Research of Bethesda, U. S. A. We wish to express our deep thanks to the Baron Edmond de Rothschild for his continuous generosity which guarantees the perenniality of these meetings and to the authorities of the National Foundation for Cancer Research, in particular Mrs Tamara Salisbury and Dr. Franklin Salisbury for having joined hands with us in this venture. We wish also to express our gra~itude to the adminis- trative staff of the Isra~l Academy and in particular to Mrs Avigail Hyam for the efficiency and excellency of the local arrangements. Bernard Pullman ,Joshua Jortner B. Pullman and J. Jortner (eds. ) , ,Vucleic Acids the Vectors of Life, /-/5. (c) 1983 by D. Reidel PuhlisliinK Company. BASE SEQUENCE. I-!E. LJY ":'TRIJCTIIR!: I\NI' INTRIN

The Fifteenth Jerusalem Symposium reflected the high standards of the former international scientific meetings, which convene once a year at the Israel Academy of Sciences and Humanities in Jerusalem to discuss a specific topic in the broad area of quantum chemistry and biochemistry. The topic at this year's Jerusalem Symposium was intramo lecular dynamics, a subject of central interest for theoreticians, che mists and biologists. During the last two decades, there has been remarkable pro gress in our understanding of time dependent phenomena. The development and application of the modern techniques of quantum mechanics and sta tistical mechanics to excited-state dynamics and to chemical and biophy sical systems constitutes a fast developing current research area. The main theme of the Symposium was built around a conceptual framework for the elucidation of photophysical and photochemical phenomena in atoms, molecules, van der Waals complexes and clusters, condensed phases, poly mers and biological supermolecules. The interdisciplinary nature of this research field was deliberated by intensive and extensive interactions between scientists from different disciplines and between theory and experiment. This volume provides a record of the invited lectures at the Symposium."

The Twentieth Jerusalem Symposium reflected the high standards of these distinguished scientific meetings which convene once a year at the Israel Academy of Sciences and Humanities in Jerusalem to discuss a specific topic in the broad area of quantum chemistry and biochemistry. The Twentieth Jerusalem Symposium marked an auspicious occasion. commemorating two decades of this scientific endeavour. The topic at this year's Jerusalem Symposium was Large Finite Systems which constitutes a truly interdisciplinary subject of central interest in the broad areas of chemistry. physics. astrophysics and biophysics. The main theme of the Symposium was built around bridging the gap between molecular. surface and condensed matter chemical physics. Emphasis was placed on the interrelationship between the properties of large molecules. van der Waals complexes and clusters. focusing on the structure. dynamics of nuclear motion. quantum and thermodynamics size effects. the nature of electronic states and excited-state energetics and dynamics of large finite systems. The interdisciplinary nature of these research areas was deliberated by intensive and extensive interactions between scientists from different disciplines and between theory and experiment. This volume provides a record of the invited lectures at the Symposium.

The Symposium on "Transport through Membranes: Carriers. Channels and Pumps" Inaugurates the third decade of the Jerusalem Symposia. It enlarges substantially their conceptual scope by Introducing a new subject not treated there previously. In fact. It Is a topic particularly well suited for the general object of these International meetings which Is to reassemble In an exhaustive Interdisciplinary discussion chemists. physicists and biologists. theoreticians and experimentalists. The main theme of the Symposium was the presentation and evaluation of the most up-to-date data on the structural and dynamic aspects of transport through membranes within the three main pathways: through carriers. channels and pumps. This goal was fully achieved thanks to the participation of a most outstanding assembly of world's experts In the field. We wish to thank Madame Pullman. the real organizer and mainspring of this meeting. for having composed a most exciting and excellent program and for carrying It out successfully. As the twenty preceding ones this Symposium was held under the auspices of the Israel Academy of Sciences and Humanities and the Hebrew University of Jerusalem. It was sponsored by the Instltut de Blologle Physlco Chimique. Fondatlon Edmond de Rothschild of Paris. We wish to express once again our gratitude to the Baron Edmond de Rothschild for his constant and generous support which makes this continuous endeavour possible."

The Sixth International Congress on Quantum Chemistry convened at the Campus of the Hebrew University. Jerusalem. Israel. on August 22-25. 1988. The International Congresses on Quantum Chemistry are held under the auspices of the International Academy of Quantum Molecular Science. Previous International Congresses on Quantum Chemistry were held in France. Japan, the United States, Sweden and Canada. These prestigious meetings provided a central contribution to the important modern area of theoretical chemistry. The major goals of the Sixth International Congress on Quantum Chemistry were: A) To provide an overview of recent novel developments. advances and directions of research in the broad area of quantum molecular sciences. B) To establish strong interaction between the theoretical discipline of quantum molecular sciences and experiment. The general topics of the Sixth International Congress were: a) Molecular Quantum Mechanics b) Many-Body Theory of Molecular Structure c) Intermolecular Forces d) Complexes and Clusters e) Molecular Spectroscopy f) Intramolecular Dynamics g) Chemical Reactions h) Molecular Dynamics Simulations i) Condensed-Phase Chemistry j) Surface Phenomena and Catalysis k) Quantum Biochemistry 1) Biophysics The format of the Sixth International Congress consisted of plenary lectures. symposia and poster sessions. In the opening session of the Congress. commemorative addresses were delivered in honoured memory of the late Louis de Broglie and the late Robert S. Mulliken. Nobel Prize Laureates and Members of the International Academy of Quantum Molecular Science. A com memorative symposium was devoted to the honoured memory of the late Massimo Simonetta."

The Twenty-Second Jerusalem Symposium reflected the high standards of these distinguished scientific meetings, which convene once a year at the Israel Academy of Sciences and Humanities in Jerusalem to discuss a specific topic in the broad area of quantum chemistry and 'biochemistry. The topic at this year's Jerusalem Symposium was Perspectives in Photosynthesis, which constitutes a truly interdisciplinary subject of central interest to biophysicists, and biologists. chemists The main theme of the Symposium was built around a conceptual framework for the acquisition, storage and useful disposal of energy in photosynthetic reaction centres. Emphasis was placed on the elucidation of primary charge separation processes in photosynthesis and their exploration within the framework of the electron transfer theory, on the interrelationship between structural data, inter actions and electron transfer kinetics, and on the role of protein dynamics in primary processes in photosynthesis. The interdisciplinary nature of these research areas was deliberated by intensive and extensive interactions between scientists from different disciplines and between theory and experiment. This volume provides a record of the invited lectures at the Symposium."