Singlet Oxygen, the lowest electronically excited state of molecular oxygen, is highly reactive and involved in many chemical and biological processes. It is one major mediator during photosensitization, which has been used by mankind since ancient times, even though the mechanisms behind it were understood only about half a century ago. The combination of high reactivity and very long natural lifetime allows for direct optical detection of singlet oxygen and its interactions using its characteristic phosphorescence at around 1270 nm. Since this emission is very weak, optical detection was technically very challenging for a long time. Therefore, even today, most laboratories only exploit the high reactivity to observe the interaction with sensor molecules, rather than singlet oxygen emission itself. However, in recent years highly sensitive optical detection was developed, the authors being major contributors. This book is dedicated to the detection of singlet oxygen, discussing possibilities, pitfalls and limits of the various methods with a special focus on time-resolved phosphorescence and the kinetics of singlet oxygen generation and decay including involved and related processes, discussing investigated systems with various complexity from solutions over in vitro to in vivo. The long-standing paradigm that singlet oxygen phosphorescence is a benchmark for detection systems rather than an option for process observation is still ubiquitous and this book hopes to contribute in overcoming this still prevailing bias.
This book delivers the first comprehensive study on German modal verbs which summarises and critically reflects the discussion of the last 500 years, checks these findings against large corpus data and is accessible to the English reader. It is shown that non-epistemic modal verbs modify events, whereas their epistemic counterparts modify the proposition, and how the latter developed from the former.
The essays in this volume consider the involvement of business corporations and of individual businessmen in the politics of the 1930s and 1940s: in the move away from the market and also from democracy, towards state control and authoritarianism, including the massive intervention of the state in property rights. How far did businesses attempt to guide this intervention for their own purposes, and to what extent did they succeed? This debate deals, centrally, with the role of German business, of banks, of industrial corporations, and of small tradesmen in the Nazi regime. An older discussion of how they may have facilitated the Nazi takeover has been supplemented here by an investigation into how they made the regime’s policies possible, and the extent to which the profit motive drove them to participate - with sometimes more, sometimes less enthusiasm - in the politics of inhumanity. Such discussion has been given further impetus by legal action, initially in the United States, in the form of class action suits on behalf of the victims of Nazism. What do such legal and political debates mean for business history? What are the current responsibilities of business facing the consequences of historical action? And what lessons should be learned concerning the ethics of business behaviour? The contributions to this volume were originally presented as papers at a conference organised by the Society for European Business History in Paris in November 1998.
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