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  2. Pirenoxine - Wikipedia

    en.wikipedia.org/wiki/Pirenoxine

    Pirenoxine (abbreviated PRX, trade name Catalin) is a medication used in the possible treatment and prevention of cataracts.. A report in the Inorganic Chemistry journal showed that in liquid solutions, pirenoxine could cause decreased cloudiness of a crystallin solution produced to mimic the environment of the eye.

  3. Engineering tolerance - Wikipedia

    en.wikipedia.org/wiki/Engineering_tolerance

    Summary of basic size, fundamental deviation and IT grades compared to minimum and maximum sizes of the shaft and hole. Dimensional tolerance is related to, but different from fit in mechanical engineering, which is a designed-in clearance or interference between two parts.

  4. Failure rate - Wikipedia

    en.wikipedia.org/wiki/Failure_rate

    Failure rate is the frequency with which any system or component fails, expressed in failures per unit of time. It thus depends on the system conditions, time interval, and total number of systems under study. [1]