The potato (Solanum tuberosum L.) had its start in the Andean highlands of South America, where archeological evidence indicates it has been cultivated for at least 8,000 years (72). Today it is grown on all continents except Antarctica. Serving as a primary food source to indigenous people when the Spanish explorers arrived in Peru in the mid-1500s, the potato traveled the globe as a valuable ...

augmenting its reactive component whenever it is forced to plan. When used to control a laboratory mobile robot, the We describe a robot control architecture which Theo-Agent in simple cases learns to reduce its reaction combines a stimulus-response subsystem for rapid time for new tasks from several minutes to less than a reaction, with a search-based planner for handling second. unanticipated...

A 67-year-old white man presented to Hermann Hospital upon referral from an Austin, Tex, physician for evaluation of recurrent chest pain. Eighteen months before admission the patient first noted episodes of chest discomfort, which he described as a left parasternal sensation of heaviness or tightness variably associated with moderate physical exertion. The discomfort would last 3 to 4 minutes ...

Today, due to qualitative growth and scientific advances, energy, especially electricity is increasingly needed by human society. One of the almost endless and pure energy which have been paid attention over the years is the solar energy. Solar cells directly convert solar energy into electrical energy and are one of the main blocks of photovoltaic systems. Significant improvement has been made...

In the one hundred years since the birthday of Academician W. J. Vernadsky, in whose honour this Geochemical Conference is being held, the population of our world has grown from about 1,250 million to not far short of 3,150 million, an addition of some 1,900 million persons. Thus, there are approximately two and one half times as many people in the world today as there were when Academician Ver...

today fingerprinting techniques are increasingly adopted as an alternative and more direct and reliable means of assembling sediment source information. one of the principal assumptions of sediment fingerprinting is that potential catchment sediment sources can be distinguished on the basis of their physical, geochemical and biological properties or fingerprint properties. however, while the so...