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Angiosperm stigmas have long been known to exhibit high levels of peroxidase activity when they are mature and most receptive to pollen but the biological function of stigma peroxidases is not known. A novel stigma-specific class III peroxidase gene, SSP (stigma-specific peroxidase) expressed exclusively in the stigmas of Senecio squalidus L. (Asteraceae)(More)
The optimal features with which to discriminate between regions and, thus, segment an image often differ depending on the nature of the image. Many real images are made up of both smooth and textured regions and are best segmented using different features in different areas. A scheme that automatically selects the optimal features for each pixel using(More)
Moral hazard exists in expert service markets because sellers have an incentive to shade their reports of buyers' condition to increase the short-run demand for their services. The California vehicle emission inspection market offers a rare opportunity to examine how reputational incentives work in such a market. I show that consumers are 30% more likely to(More)
We examine the incentives for firms to voluntarily disclose otherwise private information about the quality attributes of their products. In particular, we focus on the case of differentiated products with multiple attributes and heterogeneous consumers. We show that there exist certain configurations of consumers' multi-dimensional preferences under which(More)
Moral hazard exists in " diagnosis-cure " markets because sellers have an incentive to shade their reports of buyers' condition to increase the short-run demand for the treatments they supply. The California vehicle emission inspection market offers a rare opportunity to examine how incentives operate in such markets. This paper investigates why sellers(More)
This paper extends the theory of legal cartels to a¢ liated private value and common value environments, and applies the theory to explain joint bidding patterns in U.S. federal government o¤shore oil and gas lease auctions. We show that e¢ cient collusion is always possible in private value environments, but may not be in common value environments. In the(More)
Discocotyle sagittata oncomiracidia were rapidly killed when incubated in naïve plasma and immune sera from both rainbow trout (Oncorhynchus mykiss) and brown trout (Salmo trutta), the killing proceeding at a faster rate with blood material from the latter fish species. The lethal activity of naïve plasma and immune sera was comparable. This was abolished(More)
1. Introduction Why are some industries dominated worldwide by a handful of firms? Why is the size distribution of firms within most industries highly skewed? Questions of this kind have attracted continued interest among economists for over half a century. One reason for abiding interest in such questions of 'market structure' is that this is one of the(More)