The company has put a lot of effort into developing its Adobe Flash-based iPaper reader to provide a consistent, high quality reading experience. I sent out a tweet about this one, but the news of Scribd’s new market place for selling digital publications is interesting enough to merit a full blog post as well, in my opinion.įor anyone not already familiar with it, Scribd has been around a while now as a “social publishing” platform – basically a place that makes it easy for anyone to upload a document so that it can easily be shared, searched for, and read by pretty much anyone with a Web browser. The Pipette Checkit ® is a tool to identify potential volume delivery errors for pipettes.0 Flares Twitter 0 Facebook 0 LinkedIn 0 Filament.io 0 Flares ×
If your institution requires pipette calibration on a specific schedule, you should adhere to this schedule and use the CheckitĪs an extra verification step between scheduled calibrations. Expected performance at different volumes #Checkit ipaper verification#
When a pipette is used near the bottom of its range, the measured volumes will vary more, and are also more strongly affected by slight variations Piston pipettes are most accurate at or near their nominal volume (the maximum volume the pipette can deliver). In pipetting style or environmental factors like humidity. The markings on the Checkit reflect this variation.Ī note on environment: One advantage of the Checkit is that it can be used in the same room in which the experiment will be conducted. This can help identify variation in delivered volume due to pressure, humidity, or temperature differencesīetween the calibration environment and the experimental environment. Because the Checkit directly measures delivered volume rather than relying on gravimetric analysis, there is also no need to use correction calculations that account for these factors. Most pipette manufacturers provide specifications for both the accuracy and precision of their pipettes. Briefly, accuracy describes how close the mean of delivered volumes is to the stated volume, and precision describes the distribution of the volumesĪround the mean. If you choose to compare your Checkit readings to the manufacturer’s specifications, remember to account for both accuracy and precision when determining what range is acceptable.
0 kommentar(er)
