Descending development equipment

One of the last developed version of this system (Neotrend) was developed to monitor blood gases continuously and directly in critically-ill premature babies. The system is equipped with a tiny optical fibre catheter (0.5 mm in diameter) which is inserted into the infant s descending aorta by means of an umbelical artery catheter. A sketch of the probe is shown in Figure 4. 

The different methods of arranging the filter paper in the chromatographic chamber have been applied to sugar separations descending, ascending,39 40 and circular or horizontal development.41 These methods and other techniques will be discussed below. Detailed descriptions of the equipment needed for paper chromatography are readily available.8... 

Recent patent literature from Asahi describes novel polymerization processes that involve equipment with no moving parts, where the molten prepolymer is allowed to fall through holes and descend either freely or along a wire as a molten strand (70). The molten polymer from the bottom of the reactor is recycled to the top to reach the desired molecular weights. The setup provides a method to overcome mass transfer resistances and allows for removal of phenol from the system. Another process which has been an area of patent activity from GE and Asahi is in the area of solid-state polymerization of polycarbonate, wherein the prepolymer is converted to flakes/powder/particles and crystallized. The solids are then polymerized at a lower temperature than in conventional melt pol5unerization. Both methods seem to be in the development stage. 

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