Abstract: A constant space algorithm for rate based flow control in large computer networks. The switches in the network dynamically measure their unused link capacity, and signal sessions with higher rates to reduce their rates to that unused link capacity. Sessions with lower rates are allowed to increase their rates. This algorithm is suitable for both ATM networks and suitably modified TCP networks.

Abstract: A bioreactor is provided for production of products by biosynthesis or biotransformation using a biofilm of immobilized cells. The bioreactor includes a horizontal cylindrical housing and a central rotatable shaft which extends along the axis of the housing. Connected to the central shaft are one or more screens which are oriented parallel to the shaft, with a small gap between the shaft and the screen. The bioreactor further includes a slidable blade which is mounted onto the shaft, through a set of poles, and which is located at a fixed distance from the screen so that the blade is made to pass over the screen by the force of gravity as the shaft rotates, as by the action of a rotating external magnet. An example of use of the bioreactor is the production of .UPSILON.-decalactone from castor oil using Tyromyces sambuceus.