منابع مشابه
A Spur to Atavism: Placing Platypus Poison.
For over two centuries, the platypus (Ornithorhynchus anatinus) has been constructed and categorized in multiple ways. An unprecedented mélange of anatomical features and physiological functions, it long remained a systematic quandary. Nevertheless, since 1797, naturalists and biologists have pursued two recurring obsessions. Investigations into platypus reproduction and lactation have focused ...
متن کاملModelling crime linkage with Bayesian networks.
When two or more crimes show specific similarities, such as a very distinct modus operandi, the probability that they were committed by the same offender becomes of interest. This probability depends on the degree of similarity and distinctiveness. We show how Bayesian networks can be used to model different evidential structures that can occur when linking crimes, and how they assist in unders...
متن کاملArtificial Neural Networks and Crime Mapping
The recent change in emphasis from reactive to proactive law enforcement, as evidenced by such concepts as community-oriented policing, has resulted in the need for tools to support these efforts. While geographic information systems (GISs) have been very successful at tracking criminal activity, proactive law enforcement requires systems that anticipate the emergence of criminal activity. One ...
متن کاملAnemia with Spur
of chenodeoxycholic acid, with small amounts of lithocholic acid present as well. Spur cells manifested a striking increase in cholesterol content and in the cholesterol: phospholipid ratio, but a normal osmotic fragility. When incubated in heated normal serum, spur cells lost their excess cholesterol and became spherocytic and osmotically fragile. Conversely, sera from patients with spur cells...
متن کاملPatents as a Spur to Subsequent Innovation? Evidence from Pharmaceuticals
This paper examines how an incumbent’s patent protection acts as an implicit subsidy toward non-infringing substitutes. I analyze whether classes of pharmaceuticals whose first entrant has a longer period of market exclusivity (time between approval and generic entry) see more subsequent entry. Instrumenting for exclusivity using plausibly exogenous delays in the development process, I find tha...
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ژورنال
عنوان ژورنال: Nature
سال: 1990
ISSN: 0028-0836,1476-4687
DOI: 10.1038/348574b0