21. Changes in the blood-flow system , the vascular system, integrate responses to neuronal activity over time. 22. "' Groundwater models "'are computer models of groundwater flow systems , and are used by hydrogeologists. 23. It was called the Schnurle Reverse Flow system . 24. Based in Clackamas, Oregon, U . S . A ., Astoria-Pacific manufactures its own micro-flow systems . 25. This usage is also followed by Glansdorff and Prigogine in their 1971 text about continuous-flow systems . 26. The contact with the flow system creates channels across which reagents can be passed in solution. 27. Low flow systems are expensive for large-scale agricultural use and are predominantly used for high-value crops. 28. In very elaborate flow systems causal models can be used to simplify or abstract the flows. 29. The potential is there _ there's an inherent conflict of interest in the payment-for-order-flow system ." 30. Gretzky, playing near his hometown of Brantford, Ontario, seemed to draw life from Muckler's attacking, free-flow system .
