In the original version of this Article, the Abstract contains a typographical error. " Additional experimentation illustrated how these effects amplified over time, resulting in greater primary producer biomass sediment chlorophyll a content (Chla) in the longer term ". should read: " Additional experimentation illustrated how these effects amplified over time, resulting in greater primary pro...

One of the main factors affecting vegetation productivity is absorbed light, which is largely governed by chlorophyll. In this paper, we introduce the concept of chlorophyll efficiency, representing the amount of gross primary production per unit of canopy chlorophyll content (Chl) and incident PAR. We analyzed chlorophyll efficiency in two contrasting crops (soybean and maize). Given that they...

The steadily increasing competition of internet web sites makes it both more difficult and more important to attract and retain users. However, it is not always possible to determine beforehand which content is most appropriate to reach this goal, since the behavior and requirements of users can be heterogeneous and changing over time. In order to improve a web site text content, it is necessar...

This paper describes a use case for an application that recommends learning objects for reuse and is integrated in the authoring environment. The recommendations are based on the automatic detection of content being authored and the context in which this resource is authored or used. The focus of the paper is automatic keyword extraction, evaluated as a starting point for content analysis. The ...

Chlorophyll synthase catalyzes the final step in chlorophyll biosynthesis: the esterification of chlorophyllide with either geranylgeranyl diphosphate or phytyl diphosphate (PDP). Recent studies have pointed to the involvement of chlorophyll-linked reduction of geranylgeranyl by geranylgeranyl reductase as a major pathway for the synthesis of the PDP precursor of tocopherols. This indirect path...