The automatic federal budget cuts, known as sequestration, that took effect in March have forced universities to lay off research-related personnel, delay projects and admit fewer graduate students, according to a new survey released Monday. Eighty-one percent of responding institutions said that sequestration was directly affecting their research activities. More than half of universities said that the decrease in new federal grant opportunities -- and the shrinking value of some existing grants -- had prompted them to reduce research-related positions, and nearly a quarter of institutions said they had already laid off research employees.