Single-phase generator The early generators for those single-phase traction networks are single-phase generators. Even with newer three-phase motors which were introduced to some modern trains, the single-phases transmission for traction networks survive their time and are still in use in many railways today. However, many traction power stations have replaced their generators over time to use three-phase generators and convert into single-phase for transmission. In the early development of hydroelectricity, single-phase generators played an important role in demonstrating the benefits of alternating current. In 1891, a 3,000 volts and 133 Hz single-phase generator of 100 horsepower was installed at Ames Hydroelectric Generating
Single-use bioreactor the pH, and the color, of the dye. The color change can be detected with a laser external to the bag. This and other methods of non-invasive measurement have been developed for single-use bioreactors. Single-use process steps available are: media and buffer preparation, cell harvesting, filtration, purification and virus inactivation. Other manufacturers include Cellexus with their CellMaker with an air lift system for bacterial production,PBS Biotech, Inc. with its novel Air-Wheel mixing mechanism and low shear and scalability from lab to cGMP (Good manufacturing practice) production and is fully integrated, easy to use www.pbsbiotech.com as well as Millipore, which is