The Parker PolyPak combines an O-ring type synthetic rubber o-spring with a conventional lip-type seal to produce a unique sealing device capable of sealing both vacuum, high and low pressure. Conventional lip seals, such as the standard u-cups are prone to leakage under low pressure because little or no lip loading is inherent in the basic seal design.

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Best Answer: Serial dilution direct count: Advantages: Count all the cells living or dead Results would be quickly obtained Disadvantage: Can't differentiate between living and dead cells Direct count errors Cells could be difficult to observe without stains or phase-contrast microscopy Plate: Advantages: Counts only living cells Fewer counting errors Disadvantages: All species present may not be able to grow under specific growth conditions. Incubation time would delay collection of data More skill required for the procedure Can't detect presence of non-viable species that may be present. • Tell us some more • Upload in Progress • Upload failed. Please upload a file larger than 100x100 pixels • We are experiencing some problems, please try again.

Apr 27, 2018 - You can use serial dilutions of a solution of known concentration to calibrate lab equipment and ensure its accuracy.

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