Central MessageAdaptions of current EVLP protocols are needed to be able perfuse donor lungs for 24 hours and longer.See Article page 1963. Adaptions longer. See A great potential ex vivo lung perfusion (EVLP) lies in reconditioning grafts an unacceptable quality so that they can used transplantation. In this regard, several approaches have been described experimental studies, including the tre...

COVER Partial view of the predictive map of high levels of arsenic in groundwater resources in China (blue, low probability; red, high probability; width, 600 kilometers; resolution, 1 square kilometer). Chronic arsenic poisoning from contaminated groundwater is a major health problem in many parts of China. An estimated 19.6 million people are potentially exposed to elevated arsenic concentrat...

With the proliferation of the World Wide Web, it has become very important to provide advanced tools for maintaining referential integrity of information resources. The growing tendency toward building increasingly complex Web sites makes it necessary to maintain not only physical files, but also logical resources, or views, which are composed of references to other resources and presentation p...

We present mechanisms used to maintain the consistency of a knowledge base of spatial information based on a qualitative representation of 2-D positions. These include the propagation heuristics used when inserting new relations as well as the reason maintenance mechanisms necessary to undo the eeects of propagation when deleting a relation. Both take advantage of the rich structure of the spat...

Although water vapor is the most important greenhouse gas, it is not even agreed whether an increase in its concentration due to global warming will cause more warming or cooling. Warming (a positive feedback) will occur if the biggest effect is to absorb more outgoing long-wave radiation. Cooling (a negative feedback) will occur if the major result is to form more clouds, which would reflect m...