Whether Mr Mutt with his own hands made the fountain has no importance. He took an ordinary article of life, placed it so that its useful significance disappeared under the new title and point of view — created a new thought for that object. And the sometimes-troubled history of sizable collections of Native art in natural history museums, where the work is usually presented ethnographically, underscores those gaps. But curators describe an immense distance yet to be traveled before Native American art is given its due in public collections.
A nutrient used by plankton in ocean nourishment experiments for geoengineering purposes As an additive to extend the working temperature and open time of hide glue As a solubility-enhancing and moisture-retaining additive to dye baths for textile dyeing or printing As an optical parametric oscillator in nonlinear optics   Adverse effects[ edit ] Urea can be irritating to skin, eyes, and the respiratory tract. Repeated or prolonged contact with urea in fertilizer form on the skin may cause dermatitis. Ingestion of low concentrations of urea, such as are found in typical human urine , are not dangerous with additional water ingestion within a reasonable time-frame. Many animals e. Urea can cause algal blooms to produce toxins, and its presence in the runoff from fertilized land may play a role in the increase of toxic blooms.
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