Category: N

The perception by the nerve centers of injurious influences or painful stimuli.  

Impulse giving rise to sensations of pain.  

A substance (such as a sugar pill) or an exposure (such as to an odor or fragrance) that makes a person feel ill, even though it has no measurable negative effects. The nocebo effect can be contagious, as in cases of mass sociogenic illness.  

A species pathogenic for humans in which chronic subcutaneous abscesses are formed.  

Swedish chemist and philanthropist who developed nitroglycerin, 1833-1896, and whose will provided funds for awarding the annual prizes] Awards given almost every year since 1901 to honor distinguished contributions to world peace, chemistry, physics, literature, economics, physiology, and medicine.  

An element obtained from the bombardment of curium. Its atomic number is 102. The atomic mass of the most stable isotope of nobelium is 254; other isotopes vary in weight from 252 through 256.  

A chemical reagent used in biological laboratories.  

Containing nitrogen in its lowest valency.  

An enzyme that catalyzes the reduction of nitrogen to ammonia.  

A nitrogen-containing constituent of blood or milk that is neither a protein nor an amino acid. Most nonprotein nitrogen in the human body is in the form of urea.