1.   The U.S. studies have drawn attention to the use of glycol ethers - solvents used to etch circuits on to silicon wafers.

2.   And IBM and Lucent Technologies are pursuing an alternative direction, using ultra-short-wavelength X-rays to etch the circuits, instead of light.

3.   Disk-shaped Silicon wafers are the base material for chips onto which tiny electronic circuits are etched.

4.   Mattson makes devices that clean off unwanted chemical residue from computer chips after the circuits have been etched.

5.   Silicon chips are made in batches of several hundred per wafer by machines call steppers, which etch circuits into the silicon.

6.   Silicon wafers are the base material for chips onto which tiny electronic circuits are etched.

7.   This project, for example, is headed by a surgeon but relies on the advanced fabrication technology used to etch circuits into a computer microchip.

8.   To make a chip, a tiny electrical circuit is etched onto a slab of silicon called a wafer.

9.   Ways were found, for example, to etch more circuits onto tiny chips without adding manpower or cost to the manufacturing process.

10.   Without the technology, costly hard-to-handle chemicals would have to be used to etch circuits into the copper plates, raising environmental concerns.