GEN. JUAN ALBERTO MELGAR CASTRO,

52, who served four years as president of Honduras, died of a heart attack Dec. 2 at San Pedro Sula.

Gen. Melgar Castro also had been chief of the armed forces. He took power April 22, 1975, overthrowing Gen. Oswaldo Lopez Arellando, who had been chief of state since 1963.

He in turn was ousted by the joint chiefs of staff on Aug. 9, 1979. They named Gen. Policarpo Paz Garcia to succeed him.

Honduras returned to elected civilian rule in 1982.

LUIS FEDERICO LELOIR,

81, an Argentinian scientist who won the Nobel Prize in chemistry in 1970, died Dec. 3 in Buenos Aires after a heart attack.

Mr. Leloir received the award for his contribution to the discovery of sugar nucleotides and their role in biosynthesis of carbohydrates. He was one of the first biochemists to realize that the chemistry changing one body sugar to another had to involve a third substance, and it was that which he identified as a sugar nucleotide.

ERNST A. STEINHOFF,

79, who helped design German rockets during World War II and later was a leader in the development of rockets for the United States, died Dec. 3 at a hospital in Alamagordo, N.M. The cause of death was not reported.

Mr. Steinhoff was considered one of the world's foremost experts in missile and rocket technology. During the war, he was in charge of flight dynamics, guidance, control and telemetry of the German V-2 rocket.

He was brought to the United States from Germany in 1945 with Dr. Werner von Braun and more than 100 other scientists to develop rockets and missiles for the U.S. armed forces.