41.   For that purpose, scientists must use another test and perform it in high-level biosafety laboratories.

42.   Forensic scientists use DNA from two sources to make identifications.

43.   From a control center at the Smithsonian Astrophysical Observatory in Cambridge, Mass., scientists will use Chandra to observe otherwise invisible and often violent realms of the cosmos.

44.   For the experiment, scientists are also using conventional microphones, to match sounds against the voiceprints they are making.

45.   Genentech scientists soon used biotechnology to make somatostatin, a hormone that turns off secretion of other hormones in the brain.

46.   He said scientists have used a boat equipped with electrodes to shock the water, stunning the eels before scooping them with a net.

47.   He wants to reduce the principles of ecosystem function to mathematical equations that scientists can use to predict how nature will behave under varying conditions.

48.   He tried to call attention to the unanswered questions of classical embryology so that younger scientists could use the power of molecular biology to go where he could not.

49.   However, many scientists use loose-leaf notebooks because they say it makes it easier to enter computer-generated graphics and other data.

50.   If so, scientists could use the information to develop new therapies for such disorders.