Nortel Networks announced that John Roth, the company's CEO, would retire next April and that Clarence J. Chandran, the company's COO, had resigned because of health reasons. Nortel said that it will start looking for a new chief executive and that Roth will take over the responsibilities of Chandran, who was two months into a medical leave to recover from surgery related to a 1997 stabbing in Singapore. 360networks is scheduled to announce its first quarter 2001 financial results after the close of North American stock markets on Tuesday, May 15. 360networks will host a conference call to discuss the results at 5 p.m. Eastern time on May 15. To participate, dial 1-800-521-5499 or 1-303-267-1000. A replay of the call will be available for 72 hours. To listen to the replay, call 1-800-625-5288 (access code 103194) or 1-303-804-1855 (access code 103194). Applied Biosystems Group, an Applera Corp. business, announced the release of its ABI PRISM SNaPshot Multiplex System for five-dye, single nucleotide polymorphism (SNP) analysis. SNPs are an essential component of disease gene research, drug discovery, drug response prediction and evolution studies. The SNaPshot Multiplex System enables SNP validation, screening, linkage mapping, and association studies.