Chlorophylls and Bacteriochlorophylls: Biochemistry, Biophysics, Functions and Applications

Supplementary material to this book contains the following Adobe-Writer (.pdf) files: an overview of the material, the color coding for the map on the title page), and supporting information for chapter 1, 14, 20, 22 and 30. Some of the files contain further links to materials on this server, in particular is there a collection of structural formulas accessible from the material to chapter 1. Please, click on the respective files for downloading. Any reference should cite the full title of the book

Derivation of the formyl-group oxygen of chlorophyll b from molecular oxygen in greening leaves of a higher plant (Zea mays)

Using mass spectroscopy, we demonstrate as much as 93% enrichment of the 7-formyl group oxygen of chlorophyll b when dark-grown, etiolated maize leaves are greened under white light in the presence of 18O2. This suggests that a mono-oxygenase is involved in the oxidation of its methyl group precursor. The concomitant enrichment of about 75% of the 131-oxygen confirms the well-documented finding that this oxo group, in both chlorophyll a and b, also arises from O2. High 18O enrichment into the 7-formyl oxygen relative to the substrate 18O2 was achieved by optimization of the greening conditions in combination with a reductive extraction procedure. It indicates not only a single pathway for Chl b formyl group formation, but also unequivocally demonstrates that molecular oxygen is the sole precursor of the 7-formyl oxygen

A Lifetime of Theory and Action on the Ethical Use of Computers: A Dialogue with Enid Mumford

Enid Mumford devoted her career to promoting the ethical use of computers. She founded her work on ethics, socio-technical and general systems theory, and action research. These foundations translated into four principles underlying all her work: (1) Information systems should be designed to improve the quality of life for all. (2) Individuals should be able to participate in designing their own working circumstances and information systems. (3) Solutions to local problems have global consequences. (4) All research should include action to improve the situation being studied. Enid Mumford¡¯s legacy extends from ethical information system design to complex problem solving in the global era. This paper is an interview of Enid Mumford at her home in the United Kingdom in the summer of 2003 with a brief introduction to the theoretical foundations of her thinking, her research and her legacy to the information systems research field

Ten Years of The Philosophical Foundations Mini-Track at AMCIS - Some Patterns

The Origins The first decade of the Philosophical Foundations mini-track at AMCIS has come to an end. Ten years of a lively discourse on a variety of topics hinging on philosophy, systems theory and ethics have left the core supporters of the track emotionally attached to the community of participants and the international effort that first grew out of the frustration of four individuals (Bunker et al., 2004, 2005) who felt strongly about promoting a more philosophical, systems-theoretical and ethical agenda for the information systems research field. At the time, it was difficult to find conference forums or publishing outlets for articles that built upon philosophy, systems theory or ethics. The general feeling amongst the founding members of the track was that the IS field considered ideas of many world-class philosophers too detached from IS research practice to be interesting or important. Similarly, systems theory had fallen out of fashion despite the fact that the very ideas of a computer and an information system originated from the concepts of that theory. Globa

Contrasting Approaches to Implementing an Evolving Technology: Internet-EDI

This paper traces the evolution of Internet-EDI technology in the last 3 years through two illustrative cases of it\u27s implementation -an Internet-EDI pilot project by Bank of America (BofA) and Lawrence Livermore National Labs (LLNL) in 1994, and a robust, production level Internet-EDI implementation by McKesson in 1996. While BofA took a proof of concept approach in its early implementation, McKesson applied the traditional life cycle model in the system design and purchased much of its Internet-EDI capability up front, albeit at a prohibitive cost. The rapid evolution of the technology has resulted in the availability of browser-based systems in early 1997. By facilitating entry of small to mid size companies into EDI networks, these inexpensive systems could transform the competitive landscape within these network