Retention system

Funds for water retention systems, flood control, Irwestmentsln alternative irrgatlon techniques... 

Stimulation of saliva production is under sympathetic and parasympathetic control. Parasympathetic stimulation produces a serous watery secretion, whereas sympathetic stimulation produces much thicker saliva. Drug delivery systems, therefore, should not be placed over a duct or adjacent to a salivary duct, as this may dislodge the retentive system or may result in excessive wash-out of the drug or rapid dissolution/erosion of the delivery system making it difficult to achieve high local drug concentrations. If a retentive system is placed over salivary ducts, the reduced salivary flow rate may produce less or no mucus which is required for the proper attachment of a mucoadhesive delivery device. 

A tight closed room can also be used as a containment area, providing enough volume for the effluent to be contained, giving time for the subsequent treatment of relieved material by, for example, a scrubber system. These types of measures should only be considered as a last resort, since they are linked with heavy damage to the equipment. An alternative is the safe-bag retention system, proposed by Siemens [38]. 

Siemens A. (2006) Safe-Bag Retention System. http //www.automation.siemens. com (accessed on 21.11.2007). 

The reaction between absorbed Cl, and the PCA is slow, and only part of the absorbed Cl, reacts in the tower. Part of this PCA from the bottom of the tower is sent to a retention system where the reaction is given time to approach equilibrium. The rest of the PCA is sent to the chloral production unit. Ethyl alcohol is added to the PCA going to the retention system. Then the PCA is recycled from the retention system to the top of the absorption column, and ethyl alcohol is added at a rate sufficient to keep the recycle rate and recycle concentration constant. 

The samples were analyzed by capillary gas chromatography and gas chromatography/mass spectrometry (GC/MS). Identifications were verified by comparing the component s mass spectmm and experimental retention index (I) with that of an authentic reference standard. The retention system proposed by Kovats (12) was utilized. When standards were not available the identifications were considered tentative. 

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