منابع مشابه
Performing Group-By before Join
Assume that we have an SQL query containing joins and a group by The standard way of evaluating this type of query is to rst perform all the joins and then the group by operation However it may be possible to perform the group by early that is to push the group by operation past one or more joins Early grouping may reduce the query processing cost by reducing the amount of data participating in...
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By using in silico models of the complexes formed by analogues of a cancer drug and its receptor, it may be possible to strategically redesign existing drugs and win the race against mutations that lead to drug resistance in prostate cancer.
متن کاملWhat the Cuban Revolution Means to Older Cubans
This paper discusses what the Cuban Revolution means to older Cubans and how it has changed their lives. It addresses why many older Cubans still appear to identify with the revolution and its accomplishments, despite its failure to provide for their basic needs. The elderly are disproportionately affected by the hardships of life in Cuba, receiving pensions on which they cannot live, residing ...
متن کاملSpace race functional responses.
We derive functional responses under the assumption that predators and prey are engaged in a space race in which prey avoid patches with many predators and predators avoid patches with few or no prey. The resulting functional response models have a simple structure and include functions describing how the emigration of prey and predators depend on interspecific densities. As such, they provide ...
متن کاملThe founder space race: a response to Waters et al.
assert incorrectly that there is a ‘lack of evidence for causal connections between genetic factors, demography, and extinction risk’ [1]. Their entire Letter provides detailed evidence for this point. Unfortunately, their reply largely overlooks our point that the justifications for the 50 and the 500 in the 50/500 rule are fundamentally different. We are in complete agreement with them that t...
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ژورنال
عنوان ژورنال: Nature
سال: 1979
ISSN: 0028-0836,1476-4687
DOI: 10.1038/281246c0