This handbook is an edited and updated version of the final report of the IEA Bioenergy sponsored Pyrolysis Activity - PYRA - that officially finished in 1998 and accomplished many valuable contributions to the science and technology of fast pyrolysis. It is intended that this handbook will provide a useful guide both to newcomers to the subject area as well as those already involved in research, development and implementation. The IEA Bioenergy Pyrolysis Task is continuing this work as a collaborative project with the European Commission network on fast pyrolysis of biomass which is now known as PyNe. The European Network was first formed in 1995 as an EC sponsored project in the AIR Programme (AIR3-CT94-1857). At the end of the three-year lives of the Networks in 1997, both sponsoring organisations recognised the benefits from their integration. This led to the present PyNe Network, which is co-sponsored by the European Commission FAIR Programme (FAIR-CT97-3409) and IEA Bioenergy, and which itself is sponsoring the publication of this book as a contribution to the technology.

This second volume reports on the reaction patterns of lymph nodes in neoplastic and immunodeficient diseases. Based on the contents of volume 1, it presents a detailed survey of lymph node structures and their cellular components under these conditions. The patterns of nodal reactions to the development and spread of cancer have recently been investigated and discussed by several authors. Here, the immediate interactions between tumor tissue and the regional nodes have been assessed in experimental models and in human material. Using modern morphological methods such as im munohistochemistry on the light and electron microscopic level, new insights have been gained into the stepwise process of lymphogenous metastasis. Macrophages/reticulum cells were found to playa signifi cant role in this process, which is duly emphasized. Based on appro priate animal models, one chapter focuses on various subtypes of these cellular elements and their role in the two separate phases of tumor spread and the development of true metastases. The induction of fibronectin in lymph nodes is effected by tumor cells forming a special part of the extracellular matrix. The multifunctional fibronec tin molecule serves as a mediator between tumor cells and fibroblasts, furthering the formation of tumor stroma. This volume also contains a comprehensive survey of primary im munodeficiency syndromes and their nodal manifestations, reference being made to the most recent immunological knowledge."

When two phase coherent laser beams are crossed at an angle, the electric fields of the beams produce a sinusoidal interference pattern. Partial absorption of the electric fields in a colloidal sample creates a sinusoidal temperature field. The temperature gradient then causes production of concentration gradient in the sample, known as the Ludwig-Soret effect or thermal diffusion. Solutions to nonlinear partial differential equations that describe the effect show that shock waves analogous to fluid shock waves are produced. A mathematical relation between the shock speed and the density fraction of one component, analogous to the well-known Rankine-Hugoniot equations, is derived. Self-diffraction and imaging experiments show shock-like behavior in colloidal systems governed by the thermal diffusion.