Thus, we would expect sandy, poorly developed (sesquioxide- and clay-poor) to saturate with N fairly quickly compared to finer textured volcanic or highly weathered soils (sesquioxide-

and clay-rich) Secondly, the theories on processes of organic matter derived N input to soil are poorly known. Far more studies have focused on forest floor organic matter turnover Selleckchem Saracatinib and release of N but there is evidence that most soil organic matter (and therefore N) increases are fine root derived (Oades, 1988). The vast majority of forest ecosystems contain less N than would be expected from even modest inputs of N from atmospheric deposition and N fixation. We suspect that the reason for this is periodic fire, which can remove substantial amounts of N by volatilization, and can occur even in humid

ecosystems during droughts. Research over the last two CP-690550 molecular weight decades has suggested that N retained within forest ecosystems is not slowly bled away by leaching after inputs have been reduced, but remains within the system unless it is harvested or burned. Cases of occult N inputs – where apparent net increments of N exceed known inputs – still occur but not in all cases. We suspect that unmeasured inputs by dry deposition, non-symbiotic N fixation, and weathering of N from sedimentary rocks may account for this occult N when it occurs. This research was supported by the National Science Foundation, the U.S. Forest Service, and the Nevada Agricultural Experiment Station, University of Nevada, Reno. “
“The authors regret that some data in Table 2 contained incorrectly labelled data and should be replaced with the table below. The authors

would like to apologise for any inconvenience caused. “
“The cognitive approach to Artificial Intelligence emerged in the early days of the discipline: it borrowed its original inspiration from the methodological approach developed by scholars in Cybernetics. In this setting, the computational simulation Pomalidomide nmr of biological processes played a central epistemological role in the development and refinement of theories, and in the realization of intelligent machines. Likewise, thanks to a computational approach to Cognitive Science, intelligent systems have been proposed based on plausible models of human cognition and computational cognitive models and architectures, and aimed at a deeper understanding of human thinking. In the last few years, these approaches gained new consideration in wide areas of research such as Knowledge Representation and Reasoning, Robotics, Machine Learning, Bio-Inspired Cognitive Computing, Computational Creativity and further research fields that are now targeting Human Level Intelligence (also called AGI, Artificial General Intelligence) in computational artifacts. This special issue is intended to provide a fair overview of the research being carried out in the interdisciplinary area of cognitively inspired AI systems.