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This experiment is predated by two other still-active scientific devices; the Oxford Electric Bell and the Beverly Clockbut each of these has experienced brief interruptions since The experiment was not originally carried out under any special controlled atmospheric conditions, meaning the viscosity could vary throughout the year with fluctuations in temperature.
Some time after the seventh drop fellair conditioning was added to the location where the experiment takes place. The lower average temperature has lengthened each drop's stretch before it separates from the rest of the pitch in the funnel.
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The experiment is monitored by a webcam  but technical problems prevented the November drop from being recorded. Hundreds of thousands of Internet users check the live stream each year. Professor John Mainstone died on 23 Augustaged 78, following a stroke. The ninth drop touched the eighth drop on 17 April On 24 AprilProfessor White decided to replace the beaker holding the previous eight drops before the ninth drop fused to them.
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While the bell jar was being lifted, the wooden base wobbled and the ninth drop snapped away from the funnel. Since mid-Marchthe live feed was interrupted due to technical problems in the experiment's webpage.
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The pitch drop experiment at Trinity College Dublin in Ireland was started in October by an unknown colleague of the Nobel Prize winner Ernest Walton while he was in the physics department of Trinity College. This experiment, like the one at Queensland University, was set up to demonstrate the high viscosity of pitch.
This physics experiment sat on a shelf in a lecture hall at Trinity College unmonitored for decades as it dripped a number of times from the funnel to the receiving jar below, also gathering layers of dust. In Aprilabout a decade after the previous pitch drop, physicists at Trinity College noticed that another drip was forming.
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They moved the experiment to a table to monitor and record the falling drip with a webcam, allowing all present to watch. The pitch dripped around pm on 11 Julymarking the first time that a pitch drop was successfully recorded on camera.
Based on the results from this experiment, the Trinity College physicists estimated that the viscosity of the pitch is about two million times that of honey, or about 20 billion times the viscosity of water.
It is reported that a pitch drop experiment has been recently rediscovered at Aberystwyth University in Wales. Dating fromit predates the Queensland experiment by 13 years.
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But as the pitch is more viscous or the average temperature lower this experiment has not yet produced its first drop. In the Hunterian Museum at the University of Glasgow are two pitch-demonstrations by Lord Kelvin from the 19th century. Kelvin placed some bullets on top of a dish of pitch, and corks at the bottom: over time, the bullets sank and the corks floated.
Lord Kelvin also showed that the pitch flows like glacierswith a mahogany ramp that allowed it to slide slowly downward and form similar shapes and patterns to rivers of ice in the Alps.
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From Wikipedia, the free encyclopedia. Not to be confused with Oil drop experiment.
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This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Queensland portal Ireland portal Science portal. BBC News. Archived from the original on 15 June Retrieved 26 July The Australian.
News Limited. Archived from the original on 6 April Stability studies should be conducted on product stored under normal storage conditions or, preferably, under exaggerated conditions. Products liable to degradation by light or moisture should be stored either in a lighted area or under conditions of high humidity unless it can be demonstrated that the packaging will prevent deterioration by that condition of interest.
For example, a product liable to degrade by light need not be stored in a lit area if it is normally packaged and stored for use in an opaque container. While Section Testing procedures must include a stability indicating test which will distinguish the active ingredient from any degradation products and be able to make a reliable estimate of the quantity of any degradate.
The stability indicating test does not have to be the assay method used to determine product strength. Manufacturers, who contract with analytical laboratories to perform either end product testing or stability studies, or who produce product under contract for other firms are ultimately responsible for the quality of the product and must have copies of all analytical procedures employed and the appropriate documentation to assure their validity on file. Likewise, repackers who rely on stability studies performed by the manufacturer must have copies of all analytical data necessary to support the expiration dating period.
Although specific methods are critical to determine product stability, they do not have to employ any specific technique. The use of quantitative analysis, where limits are known, such as thin layer chromatography, may be satisfactory.
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While many USP tests are specific for the drug or its degradates and may be used for stability testing, some USP monographs do not incorporate stability indicating tests. Additionally, it may be unreasonable to expect a manufacturer to develop specific methodology for each component of some multi-component drugs containing ingredients of botanical origin such as benzoin, Peruvian balsam or tolu balsam.
The requirement that stability testing be performed in the same container-closure system as that in which the drug product is marketed has been subject to interpretation. The courts ruled in U.
Kaybel that when a "new drug" was repackaged, the repacker did not have to obtain pre-market approval of the repackaged product or the firm's repacking procedures. However, the repacker is subject to applicable current good manufacturing practices. Although stability studies were performed on the dosage unit in the original manufacturer's container, the event of placing the dosage unit into a different storage unit may and often does affect the product's shelf life.
It is the policy of the Center for Drugs and Biologics to allow repacking into container-closure systems that can be demonstrated to be at least as protective or more protective than the original system without performing new stability studies prior to marketing. Satisfactory comparison of container-closure systems may be done by several methods, i.
Stress testing refers to testing the product after storage under exaggerated conditions.
This will usually involve high temperature and high humidity. It is also current policy to allow firms to repackage solid dosage units from plastic containers into glass containers because glass has been shown to be a superior moisture and gas barrier.
This policy does not apply to liquid drugs because of pH problems resulting from the alkaline nature of glass. Policies relating to the expiration dating of unit dose repackaged drugs may be found in Compliance Policy Guide b. This also does not apply to repacking from bulk containers. When the same product is marketed in more than one size, e. This indicates that the smallest marketed container is the most critical in terms of the container properties contributing to product degradation.
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Thus, moisture or oxygen permeation through a 4 oz bottle is more critical than through a 16 oz bottle of similar construction. For this reason, when studying stability of the product marketed in several sizes of similar containers, testing of the smallest container size is imperative to be in compliance with CGMPs.
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While we recommend that all other container sizes be subjected to stability testing, the fact that some may not is not necessarily a violation of CGMPs. Products formulated to contain preservatives to inhibit microbial growth should be monitored throughout their shelf life to assure the effectiveness of the preservative system.
Once a minimally effective level of preservative is established, chemical testing for the preservative s may be performed. The preservative system should be monitored at the same stability testing times as other ingredients are monitored.