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The samples used in this study were synthesized by the same chemist using the same method, chemicals, and apparatus.
The inter-batch variation increases to 27%, indicating that there is some variation in the quantity of this impurity across 20 batches of methamphetamine synthesized by the same chemist using the same equipment, method, and reagents.
This indicates that batches of methamphetamine produced by the same chemist using the same equipment, chemicals, and synthetic method would not be expected to contain consistent amounts of (at least) these key impurities from batch to batch.
Inter-batch variation in this study is defined as the variation of the presence and quantities of impurities in extractions from different batches of methamphetamine synthesized by the same chemist using the same preparative method.
Accordingly, the variability of the quantity of 1-phenyl-2-propanol in batches made by the same chemist may be too great to allow batch to batch linkage of the final products.
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The same chemist also found glyphosate levels in many samples of oatmeal, including infant oat cereal.
Lucentis is actually a fragment of Avastin, developed by Napoleone Ferrara, the same Genentech chemist who created the cancer blockbuster.
The Frick has a lively street scene by the genius draftsman Gabriel de Saint-Aubin, but the Morgan's paperback-size drawing by the same artist of a chemist giving a demonstration in an ornate hall is miraculous in its handling of light and space and its nearly microscopic detailing of people and objects.
This translates to the ability of law enforcement to link together batches produced by the same clandestine laboratory or chemist.
Along the way, that same chemist has developed a terrific expertise with certain analytical instrumentation.
And George M. Whitesides, a Harvard chemist, got intrigued by the same challenge and began work on a revolutionary variant: skip all the plastic and let the fluids instead be wicked through paper the size of a postage stamp infused with color-changing reagents.
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