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q arm of a chromosome

The symbol “p” was chosen to designate the short arm because “p” stands for “petit”, “small” in French. The letter “q” was selected to signify the long arm merely because “q” is the next letter in the alphabet.

Q bands

A form of chromosome band, one of the bright and dull fluorescent bands seen alternating along the length of chromosomes under ultraviolet light after the chromosomes are stained with quinacrine. The Q in Q band stands for Quinacrine, an agent used as an antimalarial agent and, in the laboratory, as a fluorescent dye.

Q fever

An infectious disease due to the bacterium Coxiella burnetii whose symptoms include fever, headache, malaise, and pneumonia (interstitial pneumonitis), but not rash. The Q stands for query because the cause of the disease was long a question mark. Q fever is a zoonotic disease and is contracted from cattle, sheep, and goats. Chronic Q fever […]

Quotient

The result of mathematical division.

Quotidian

Recurring each day, as in a fever that returns every day.

Quintan fever

184-189, 1999). The organism (B. quintana) that causes trench fever also has been found responsible for a disease called bacillary angiomatosis in people infected with HIV and for infection of the heart and great vessels (endocarditis) with bloodstream infection. Trench fever is also called Wolhynia fever, shin bone fever, five-day fever, Meuse fever, His’ disease, […]

Quinsy

Not a TV detective but an old word for a peritonsillar abscess. Whether you call it quinsy or a peritonsillar abscess, it is a collection of pus (an abscess) behind the tonsils that pushes one of the tonsils toward the uvula (the prominent soft tissue dangling from the back of the palate in the back […]

Quinine

The original antimalarial agent, quinine took its name from the Peruvian Indian word “kina” meaning “bark of the tree” referring to the cinchona tree. From this tree, quinine was first obtained. The Peruvian Indians called it “the fever tree.” Quinine, a large and complex molecule, is the most important alkaloid found in cinchona bark. Until […]

Quincke’s disease

This is angioneurotic edema (or angioedema), a form of localized swelling of the deeper layers of the skin and fatty tissues beneath the skin. Hereditary angioneurotic edema (or hereditary angioedema) is a genetic form of angioedema. Persons with it are born lacking an inhibitor protein (called C1 esterase inhibitor) that normally prevents activation of a […]

Quinacrine

An antimalarial drug and, in cytogenetics, a fluorescent dye used to stain chromosomes. The Y chromosome stains brilliantly with quinacrine.