Blue-green algae: their excretion of iron-selective chelators enables them to dominate other algae

During blue-green algal blooms, other algae can be completely suppressed. This ability of blue-green algae to suppress other algae may be determined by the abailability of iron. Iron deprivation induces the production of hydroxamate chelators, which appear to be the agent suppressing other algae.     

How does gamma-interferon mediate resistance to Listeria monocytogenes?

Gamma-interferon (IFN-gamma) seems to be required for resistance to Listeria monocytogenes in vivo, but acts early in infection, before apparent T cell involvement. The early role of IFN-gamma is unknown, but might include enhancing antigen presentation, inducing secretion of tumor necrosis factor alpha and helping early precursor macrophages to express nonspecific listericidal activity.     

Compass: an expert system for telephone switch maintenance

Abstract: GTE's Compass (Central Office Maintenance Printout Analysis and Suggestion System) is an expert system that aids in the maintenance of a telephone switching system. It analyzes maintenance printouts of telephone company central office switching equipment and suggests maintenance actions to be performed. The results from several field trials indicate that the current version of Compass performs well in identifying system faults and in suggesting corresponding maintenance actions. An expanded version of the expert system is under development while the present version is being put into field use.