摘要:
The present invention provides a novel method for the fast generation of high expression stable cell lines for the production of recombinant proteins with high efficacy of stable integration while using low selective pressure for only a short period of time. The method uses transiently expressed piggybac transposase to mediate stable integration of a transgene of interest flanked by the PB transposon termini.
摘要:
Recombinant proteins are of great commercial interest. Yet, most current production methods in mammalian cells involve the time- and labor-consuming step of creating stable cell lines. Production methods based on transient gene expression are advantageous in terms of speed and versatility, yet, thus far, those methods have not shown the specific productivity, batch yield and volumetric yield to be an economic alternative to stable cell lines. The inventors improved on the methodology of transient transfection and achieved commercially relevant yields in terms of specific productivity (exceeding 35 pg per cell per day), batch yield (exceeding 700 mg/l) and volumetric yield.
摘要:
The invention relates to a device for detecting a sample in a longitudinal sample container (10), comprising a sample container holder (30) for holding the sample container in a housing. Said sample container holder comprises a side viewing window in the region of at least one longitudinal side of the sample container, and a front viewing window (35) in the region at least one front side of the sample container. Said device also comprises a first illumination arrangement for illuminating the sample container through the front viewing window, a second illumination arrangement for illuminating the sample container through the side viewing window, and an imaging photodetector for detecting a first image of the sample illuminated by means of the first illumination arrangement, and a second image of the sample illuminated by means of the second illumination arrangement. Said detection takes place through the side viewing window. Said device further comprises a digital data processing unit for overlaying the first and second images and for representing the resulting overlay image on a display device connected to the data processing unit.
摘要:
The invention relates to a method for determining the viability of cells in cell cultures, said method comprising the steps of: colouring the sample with a dye which can penetrate into individual cells depending on the viability of the latter, determining the proportions of cells which are coloured to differing extents. The invention is distinguished by virtue of the fact that a cell suspension of the coloured cells is centrifuged as a sample in a sample vessel (10) until the solid content present in the sample has settled as a compressed cell cake (13), and, in order to determine the proportions, the volumes of differently coloured sections (131, 132, 133) of the compressed cell cake (13) are determined as a measure of the proportions of cells of different viability.