31.   His research focused on the engineering properties of concrete, asphalt and soils.

32.   His research focused on the role of governments and industries in guiding economic development.

33.   His research focuses on tiny machines known as microelectromechanical systems, or MEMS.

34.   Human research focuses on the effect of isolated and confined environments on human physiology and social interactions.

35.   His research focused on the Schwann cell, which has many functions in the spinal cord, like insulating nerves or sending chemical messages.

36.   His scientific research focused chiefly on leukemia and on the treatment of hematologic malignancies.

37.   Later his research focused on the genetics of dinoflagellates, a group of marine protozoa that can produce red tides.

38.   McKnight, whose research focuses on international technology policy and the convergence of the Internet and telecommunications industries, recently co-edited a book with two colleagues.

39.   Pierce agreed, saying all previous research focused on the time that children take up smoking regularly.

40.   Previous research had focused on regions much farther from the black holes.