Category: U

A hissing sound said to arise from the umbilical cord.  

The sense of taste triggered by glutamates, such as monosodium glutamate (MSG). It has been proposed as a fifth taste sensation, in addition to the traditionally recognized tastes (bitter, salty, sour, sweet).  

Treatment with ultraviolet radiation.  

Exceptionally fast; said of, e.g., centrifuges, some chemical reactions, and some forms of tissue fixation or freezing.  

A filter by which colloidal particles may be separated from their dispersion medium or from crystalloids.  

Concerning biological rhythms that occur less frequently than every 24 hr.  

Treatment or preparation of substances by use of the ultracentrifuge. Analytical ultracentrifugation is a means of determining molecular mass, structure, and size. Preparative ultracentrifugation is a means of purifying mixed solutions of proteins. It separates them based on their densities or their sedimentation coefficients.  

One of two embryonic pharyngeal pouches usually considered as rudimentary fifth pouches. They become separated from the pharynx and incorporated into the thyroid gland, where they give rise to parafollicular cells that secrete calcitonin, a hormone that lowers the blood calcium level.  

The scientific name for slippery elm. Also known as Ulmus rubra.  

Folliculitis of the eyebrows, characterized by loss of hair and scarring.