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The photometric phase curves of Saturn's A and B rings exhibit a sharp peak in reflectance when the phase angle approaches zero, commonly known as the opposition effect. Recent work has suggested that the width and amplitude of the opposition effect may be consistent with coherent backscattering from wavelength-sized grains which cover the surfaces of macroscopic ring particles.
The human hookworm Necator americanus appears to have evolved a number of complementary strategies to overcome the host's haemostatic processes. These include the inhibition of blood coagulation, platelet aggregation and mediator release, and the secretion of fibrinogenolytic enzymes. These strategies presumably allow the parasite to establish the chronic infections so often documented in human populations.
Stocker cattle operations are an important part of the nation's cattle industry. Many producers do not realize the profit potential in new technological advances, and some feed their cattle on uneconomic planes of nutrition. Stocker cattle producers can benefit from results of animal science and agronomic research if they are presented in a framework suited to use in decision-making. Analyses prepared by agricultural economists often ignore many of the factors determining gain because of lack of data and complexity of the relationships. Thus, a system for economic analysis that accounts for more factors and improves growth predictions would be highly useful. The purpose of this study is to develop and provide computerized analytical procedures to estimate physical and economic results of alternative stocker production systems.