Pay per click (PPC) search auctions are a method for selling positions on search engines that were the largest recipient of advertising spending on the internet in 2004. Little formal analysis has been conducted into this auction model. In this article we examine the potential for collusion to occur. We show that price collusion can occur between participants when their Nash equilibrium prices ...

epilepsy is an important disease with a cumulative incidence of 3% all over the life and more than half of them are started from childhood. in this study we surveyed magnetic resonance imaging (mri) findings in epileptic children and its relation with clinical and demographic findings in order to find better diagnostic and treatment modalities for these children in the future. in this cross sec...

OBJECTIVE Raising the price of tobacco products is considered one of the most effective ways to reduce tobacco use. In addition to excise taxes, governments are exploring other policies to raise tobacco prices and minimise price dispersion, both within and across price tiers. We conducted a systematic review to determine how these policies are described, recommended and evaluated in the literat...

SCP-1 is a novel tumor antigen that belongs to the growing family of cancer/testis (CT) antigens, and it is a potential target for immunotherapy. In an effort to determine the expression of SCP-1 in epithelial ovarian cancer (EOC), one-step RT-PCR was performed with RNA from epithelial ovarian tumor tissues and with two normal ovarian surface epithelial cell lines. We used immunohistochemistry ...

Let me start with some observations from my new life at Yale University. On the first day of class—I am currently teaching a survey course on Modern German History—I asked the students about their ideas of Germany. I got interesting responses ranging from classical cultural stereotypes (like sausages, Oktoberfest, fast and expensive cars) to political images (like goose-stepping soldiers, Ausch...

In EU countries, knowledge on spatial disparities in overall price level is extremely scarce. When interregional price disparities are large, however, nominal income measures fail to assess prosperity and the catch-up processes of regions. Despite its importance for regional policy, no official regional price statistic is available as a standard. On account of this gap, this paper deals with th...

The Coulter S Counter gives a value for mean corpuscular volume which does not necessarily reflect red cell size in vivo. This phenomenon may be used in early diagnosis and hence prevention of the 'hyperosmolar syndrome'.