منابع مشابه
Calling long distance
above-ground biomass and a 20-fold increase in plant cover by Artemesia frigida, a common shrubby plant of some North American and Asian grasslands. This carbon dioxide induced enhancement of plant growth, among the highest so far reported, provides evidence from a native grassland that rising carbon dioxide levels since the onset of industrial times may have been contributing to the observed s...
متن کاملCompetition and Price Dispersion in International Long Distance Calling
This paper examines the relationship between changes in telecommunications provider competition on international long distance routes and changes in prices on those routes. Overall, increased competition is associated with significantly lower prices to consumers of long distance services. However, the relationship between competition and price varies according to the type of long distance plan ...
متن کاملLocal and Long-Distance Calling: Conversations between the Gut Microbiota and Intra- and Extra-Gastrointestinal Tract Infections
Preservation of health from infectious diseases depends upon both mucosal and systemic immunity via the collaborative effort of innate and adaptive immune responses. The proficiency of host immunity stems from robust defense mechanisms--physical barriers and specialized immune cells--and a failure of these mechanisms leads to pathology. Intriguingly, immunocompetence to pathogens can be shaped ...
متن کاملDistance Is Dead , Long Live Distance
For many educators, the phrase ‘from distance education to e-learning’ conjures up the view of an ‘evolutionary’ progression beginning with correspondence study and developed through more sophisticated technologies to its current identification with computers, the Internet, and the World Wide Web. For others, particularly those with little knowledge or experience of (and often equally little in...
متن کاملLong distance transport.
A few years ago, I attended a 1-day symposium on long distance transport at a national meeting in a country abroad. Towards the end of the day, as the participants became tired and no general agreement was in sight, one observer from an allied discipline remarked, "Why can't you translocation workers make any progress, you still discuss the same miserable old models that were proposed 40 years ...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2007
ISSN: 0960-9822
DOI: 10.1016/j.cub.2007.09.017