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1,2-Benzisothiazol-3-ones undergo ring-opening when treated with sodium hydrogen sulphite solution, giving Bunte salts, reconversion of which to benzisothiazol-3-ones can be effected with dilute alkali. Given the equations AX = XAT and AX = YB with arbitrary nonzero real matrices A and B of the Discount Louis Vuitton Sunglasses same size, we seek all real solutions X and Y which are: (1) symmetric, (2) symmetric and positive semidefinite, and (3) symmetric and positive definite. Necessary and sufficient conditions for the existence of such solutions and their general forms Louis Vuitton Store are derived. Estimators for the mean life θ of an item whose life length is assumed to be exponentially distributed are considered. The nature of the life test is such that the failure can only be detected at inspection times t1t2 … tm. The inspection destructive, i.e., the items inspected at time ti are withdrawn from the test regardless of the inspection result. A non-specific esterase activity of hen lysozyme (c-type) has previously been described: histidine was claimed to be involved in this activity. The present letter reports that a histidine-less lysozyme from the duck egg-white (c-type) as well as a goose lysozyme (g-type) possess such an esterase activity determined using p-nitrophenylacetate.