Bücher veröffentlicht von Springer Netherlands

The first four volumes of the series on 'Charged and Reactive Polymers' have been devoted to polymers in solution (Voh. I and II) or in gel and membrane forms (Vols. III and IV). In correlation with charges, other physical or chemical properties of macro- molecules have been considered. Understanding of charge and hydrophobic effects is equally important for synthetic and biopolymers or their systems. Optically Active Polymers are related to problems of the same class, since optical activity is an inherent property of both natural macromolecules as well as a great variety of polymers synthesized in the Jast twenty years. Optical activity is a physical spectral property of chiral matter caused by asymmetrical configurations, conformations and structures which have no plane and no center of symmetry and consequently have two mirror image enantiomeric forms of inverse optical rotation. The racemic mixture of chiral enantiomers is optically inactive. The most common form of optical activity was first measured at a constant wavelength by the angle of rotation of linearly polarized light. More recently the measurements have been extended to the entire range of visible and attainable ultraviolet regions where electronic transitions are observed, giving rise to the ORD technique (Optical Rotatory Dispersion). The Cotton effects appear in the region of optically active absorption bands; outside of these bands the plain curve spectrum is also dependent on all the electronic transitions of the chromophores.

Eddy V AN DER MAAREL This volume is the first of two volumes covering the Sym- computer programmes for the rapid clustering and ordina- posium 'Advances in vegetation science', which was held at tion of very large sets of reI eves and for (subsequent) table Nijmegen, The Netherlands, from 15-19 May 1979. This rearrangement (this volume as well as the book Data- symposium was organized on behalf of the Working Group Processing in Phytosociology contain various new pro- for Data-Processing of the International Society for Vege- grams). What we do not have is a manual in which the tation Science. After this group held its final meeting two apparently successful methods are compared and applied years earlier it decided to continue its activities, but within a to some data-sets. H. Lieth, editor-in-chief of a new Junk wider scope. Most members of the Group felt that the series 'Tasks for vegetation science' already suggested to original aim, i. e. the introduction of data-processing and produce such a manual in this series. multivariate methods for use in the systematic description The present volume contains the texts of the lectures and of plant communities, was more or less fulfilled. The book most of the poster demonstrations of the first three sessions Data -Processing in Phytosociology, largely based on papers of the Symposium, dealing with classification and ordina- in Vegetatio, edited by E. van der Maarel, L. Orloci & S.

(RANKIN) of equivocation information (1-:) and interaction information (M). The method is described in the present paper for I: and in a previous paper (Orloci, 1976) for M. The results presented in this paper suggest that for Species Rank order Information Percentage of total* species to be weighted according to their suitability to I* M I M r M characterize isolated groups of releves in a phytosociolo- 5 7 54.15 2.31 17.97 0.82 gical table, the equivocation information may serve as a 9 5 49.86 23.19 16.55 8.22 3 3 9 47.79 0.56 15.86 0.20 suitable weight. The appropriate formulations are derived 6 4 8 36.18 1.18 12.01 0.42 4 5 3 24.36 59.34 8.09 21.03 and computed for some data from a salt marsh community. 8 6 4 24.25 39.04 8.05 13.84 10 7 I 21.96 71.17 7.29 25.23 7 8 2 18.67 69.01 6.20 24.46 9 10 18.40 6.11 10 6 5.64 16.31 1.87 5.78 References Total 301.00* 282.11 * 100.00 100.00 Feoli, E. 1973. An index for weighing characters in monothetic classifications. (Italian with English summary). Giorn. Bot. Ita!' 107: 263-268. Gower, J.e. 1967. A comparison of some methods of cluster is a monotone, increasing function of sample size if .. ).

Extensive reviews have been published on the mor- aspects, anatomy, ultrastructure, physiology, bio- phology, anatomy, and physiology of the mam- chemistry, endocrinology, pharmacology, and physiopathology of the mammalian ovary. The malian ovary. However, little attention has been given to the gaps between the physiological, endo- contributors, who prepared their chapters metic- ulously, are recognized experts in their respective crine and histochemical parameters of the ovary as disciplines and their writings reflect extensive per- it relates to clinical aspects. There is a wealth of sonal experience and unpublished data of both publications concerning the biology of the ovary: basic and clinical sciences. Without the assistance of the purpose of this volume is to integrate this information with emphasis on modern concepts in good friends and permission to draw extensively microanatomy, physiology, methodology, clinical from investigations, this volume would not have complications, and therapeutic approaches. An been possible. attempt is made to place fundamental research in Thanks are due to G. F. Franchitto, F. Barberini, clear perspectives. P. Stoops. Lori Rust and J. Squiers for their editorial It is hoped that this volume will fulfil a long- skills and for checking the references to the original standing need and serve as an important source for sources. Thanks are particularly due to 1. K. Smith investigators and clinicians concerned with the of Martinus Nijhoff Publishers BV for his excellent physiopathology of the ovaries for years to come. It cooperation during the production of the book.

Proceedings of the NATO Advanced Study Institute, Trieste, Italy, July 10-August 1, 1980