Abstract: Systems, devices, and methods for the delivery of gas bubbles to liquids are generally described. The devices can include a primary conduit comprising a plurality of openings fluidically connecting an internal flow pathway of the primary conduit to an environment outside the primary conduit. The devices may also include, in some instances, a secondary conduit located at least partially within the primary conduit, the secondary conduit configured to redistribute the pressure of the gas delivered to the openings of the primary conduit, and comprising a plurality of openings fluidically connecting an internal flow pathway of the secondary conduit to a portion of the internal flow pathway of the primary conduit outside the secondary conduit. Certain of the gas delivery systems and methods described herein are capable of delivering gas at relatively uniform linear flow velocities across multiple gas outlet openings. Certain embodiments are related to inventive configurations (e.g.

Abstract: Systems, devices, and methods for the delivery of gas bubbles to liquids are generally described. The devices can include a primary conduit (102) comprising a plurality of openings (104) fluidically connecting an internal flow pathway (106) of the primary conduit to an environment outside the primary conduit. The devices may also include, in some instances, a secondary conduit (114) located at least partially within the primary conduit, the secondary conduit configured to redistribute the pressure of the gas delivered to the openings of the primary conduit, and comprising a plurality of openings (116) fluidically connecting an internal flow pathway (118) of the secondary conduit to a portion of the internal flow pathway (106) of the primary conduit outside the secondary conduit. Certain of the gas delivery systems and methods described herein are capable of delivering gas at relatively uniform linear flow velocities across multiple gas outlet openings.

Abstract: The present disclosure shows, unexpectedly, that variations in cell culture performance in large-scale cell culture systems such as, for example, those used in commercial manufacturing processes, in some instances, can be attributed to often subtle variations among shear-protectant additives used during cell culture. Assessing the quality of shear-protective additives using such large-scale systems, however, is inaccurate, time-consuming and costly. To solve the problem identified, the present disclosure provides methods and compositions for evaluating the suitability of shear-protectant additives without resorting to large scale cell growth and/or protein production tests.