|  | Overview
        Today’s research and biologic production demands on cell and tissue culture 
        assumes no guesswork to confirming viable cell populations. Therefore, both cell 
        concentration and percentage of viable cells must be determined accurately and 
        precisely. The new Vi-CELL Series Cell Viability Analyzers provide an automatic 
        and cost effective means to perform the trypan blue dye exclusion method. This 
        data is essential to the decision making process for basic tissue culture cell 
        passage and maintaining optimum culture conditions in bioreactors. Cell and 
        tissue culture applications in life science research, including recombinant 
        protein and biopharmaceutical production, require the accuracy, precision and 
        automation available only in the Vi-CELL cell viability analyzer. 
        The Vi-CELL automates the widely accepted trypan blue cell exclusion method. 
        Historically, cell viability determinations were performed manually using a 
        light microscope and hemacytometer. This technique has major shortcomings due to 
        subjective determination of cell count, as well as manual, time consuming steps. 
        In comparison to the manual technique, the Vi-CELL automatically performs the 
        trypan blue with video imaging of the flow-through cell. Results are obtained in 
        minutes. Specifications
        
            |  | Vi-CELL XR | Vi- CELL
 AS
 | Vi-CELL (Single-Position
 |  
            | Auto Sample | Yes |  
            | Size Range (μm) | 2 - 70 | 5 - 70 |  
            | Sample Volume (ml) | 0.5 | 1 |  
            | Analysis Time (min) | < 2.5 | < 2.5 |  
            | Viability | 0 - 100 |  
            | Imaging Technology | ● Auto-focus routine ● Firewire Camera
 ● 1394x 1040 CCD array
 | ● Manual-focus routine ● Image frame grabber
 ● 640x480 CCD array
 |  Manufacturer: Beckman Coulter |