Urine tests are often unhelpful

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Pleasure Boatyard Soils are Often Highly Contaminated

The contamination in pleasure boatyards has been investigated. Measured concentrations of copper, zinc, lead, mercury, cadmium, tributyltin (TBT), the 16 most common polycyclic aromatic hydrocarbons (∑16 PAHs), and the seven most common polychlorinated biphenyls (∑7 PCBs) from investigations at 34 boatyards along the Swedish coast have been compiled. The maximum concentrations were 7,700 for Cu...

Sepsis Treatment Options Are Often Lacking.

Life-threatening sepsis presents with varying symptoms due to the wide range of pathogens that cause it, and sepsis-specific treatment options for patients are sparse.

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How Often Are Two Permutations Comparable?

Two permutations of [n] are comparable in the Bruhat order if one is closer, in a natural way, to the identity permutation, 1 2 · · · n, than the other. We show that the number of comparable pairs is of order (n!) /n2 at most, and (n!) (0.708) at least. For the related weak order, the corresponding bounds are (n!) (0.362) and (n!) ∏n i=1 (H (i) /i), where H (i) := ∑i j=1 1/j. In light of numeri...