Abstract: Probe holder for a bioreactor or other container or vessel, functioning as a base platform or stand to hold a sensor or probe, such as a Raman probe, in its an open position to be sterilized as part of an assembly including the sensor attached to a housing or container with an aseptic connector. The holder aids the user in positioning the sensor or probe at least partially within or in fluid communication with the interior of the bioreactor or vessel and holding and/or locking it in position during the use of the sensor or probe.

Abstract: A method for retention testing sterilizing grade filters comprises: a) providing a stock of Acholeplasma laidlawii; b) growing up the stock of A. laidlawii for about 24 hours or less in a single serum-free growth medium that supports cell growth to a high titer and yields a cellular morphology where the cells are small, deaggregated and spherical, thereby producing a bacterial culture; c) challenging a test filter by filtering the bacterial culture through the test filter at a known challenge level, thereby producing a filtrate downstream of the test filter; and d) detecting concentration of A. laidlawii in the filtrate. Serum-free growth media for cultivating or storing A. laidlawii are also described.

Abstract: A method for retention testing sterilizing grade filters comprises: a) providing a stock of Acholeplasma laidlawii; b) growing up the stock of A. laidlawii for about 24 hours or less in a single serum-free growth medium that supports cell growth to a high titer and yields a cellular morphology where the cells are small, deaggregated and spherical, thereby producing a bacterial culture; c) challenging a test filter by filtering the bacterial culture through the test filter at a known challenge level, thereby producing a filtrate downstream of the test filter; and d) detecting concentration of A. laidlawii in the filtrate. Serum-free growth media for cultivating or storing A. laidlawii are also described.

Abstract: A method for retention testing sterilizing grade filters comprises: a) providing a stock of Acholeplasma laidlawii; b) growing up the stock of A. laidlawii for about 24 hours or less in a single serum-free growth medium that supports cell growth to a high titer and yields a cellular morphology where the cells are small, deaggregated and spherical, thereby producing a bacterial culture; c) challenging a test filter by filtering the bacterial culture through the test filter at a known challenge level, thereby producing a filtrate downstream of the test filter; and d) detecting concentration of A. laidlawii in the filtrate. Serum-free growth media for cultivating or storing A. laidlawii are also described.