Successful establishment of clover (Trifolium spp.) on soil requires that the appropriate rhizobia are present to establish an N2 fixing association. Experiments were undertaken in the laboratory to determine if the rhizobial requirements of arrowleaf clover (Trifolium vesiculosum Savi) were different from those of crimson clover (Trifolium incarnatum L.) because arrowleaf clover is often being sown in pastures that have previously grown crimson clover. Generally, rhizobia capable of nodulating crimson clover were also able to nodulate arrowleaf clover but fixed little N2. Soil collected from nine pastures that were growing crimson clover and had never been planted to arrowleaf clover contained rhizobia capable of effectively (nodules fixed N2) nodulating arrowleaf clover. Protein profiles of rhizobia isolated from nodules of arrowleaf and crimson clover grown on soil from one of the nine locations indicated that at least 12 rhizobial strains were present, and those that selectively nodulated crimson clover generally were not able to fix N2 or showed delayed nodulation on arrowleaf clover. When arrowleaf clover was grown on the same soil, four of the five strains that formed nodules on its roots were effective. It appears that arrowleaf clover was able to select effective rhizobia from a mixed population and that it may be successfully established on fields that have grown crimson clover, even though the rhizobial requirements for the two hosts are different.
The Virtual Conference Generator (VCG) tool is part of a knowledge portal being developed by the Centro de Análisis de Imágenes Biomédicas Computarizadas (CAIBCO) at the Medical Faculty, Universidad Central de Venezuela. Targeted at the health sector, it is a content management tool focused on generating quality content while automating some operational tasks. It was developed to facilitate the interactive creation, management and publication of virtual conferences. VCG was an integral tool toward organizing a virtual conference held in July 2003 in the health sector, the "IV Congreso Virtual de Micología: Hongos Patógenos en América Latina" http://congresomicologia.ucv.ve Computer science students developed VCG using JSP technology, testing it on three different platforms, applying eXtreme Programming as an aspect of the evaluation process in an academic context.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.