The butter boletes (Boletus s.l. sect. Appendiculati) are an economically important group of ectomycorrhizal fungi whose basidiocarps have a yellow tube layer that often bruises blue, yellow reticulate stipe, mild flavor and firm yellow-tinged flesh that may or may not turn blue when exposed. Morphological characters and molecular data (ITS and LSU) place this group in a separate phylogenetic c...

Ontology patterns have been pointed out as a promising approach for ontology engineering. The goal of this paper is to clarify concepts and the terminology used in Ontology Engineering to talk about the notion of ontology patterns taking into account already well-established notions of patterns in Software Engineering.

The study of achievement goals has illuminated basic motivational processes, though controversy surrounds their nature and impact. In 5 studies, including a longitudinal study in a difficult premed course, the authors show that the impact of learning and performance goals depends on how they are operationalized. Active learning goals predicted active coping, sustained motivation, and higher ach...

Superantigens are bacterial proteins that generate a powerful immune response by binding to Major Histocompatibility Complex class II molecules on antigen-presenting cells and T cell receptors on T cells. A recent article reveals that at least one of the superantigens, staphylococcal enterotoxin B (SEB), also binds the co-stimulatory molecule CD28, suggesting that a much larger and potentially ...

Online text chat has great potential for allowing small groups of people in school or at work to build knowledge and understanding together. However, chat participants often post in parallel, making it difficult to follow the conversational flow and to identify who is talking to whom about what. The loosely ordered succession of turns contributes to “response-structure confusion.” Parallel post...

Endothelin (ET) receptors have become the targets for the treatment of a variety of cardiovascular disorders and a mixed ET type A (ETA)/ET type B (ETB) receptor antagonist, bosentan, is currently being used to effectively treat pulmonary hypertension. An ongoing debate has revolved around the question of whether selective ETA receptor blockade would be preferable to using the mixed antagonist....

Many women are turning to bioidentical hormone therapy on the basis of misconceptions and unfounded claims, eg, that this therapy can reverse the aging process and that it is more natural and safe than approved hormone therapy. The aim of this article is to clarify some of the misconceptions.