Heights, fear of
An irrational unreasonable fear of heights is called acrophobia. From the Greek “acron”, height + “phobos”, fear.
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- Heimlich maneuver
An emergency treatment for obstruction of the airway in adults. It may be needed when someone chokes on a piece of food that has “gone down the wrong way.” To perform the Heimlich maneuver, stand behind the victim, wrap your arms around their waist, makes a fist with one hand and holds the fist with […]
- HeLa cell
One of the cells grown from the cervical cancer of a young African-American woman, Henrietta Lacks. HeLa cells were the first human cells to be continuously grown in culture. The cells were first cultured in February 1951 by Drs. George and Margaret Gey at Johns Hopkins in Baltimore. The cells appear “immortal” and are still […]
- Helicase
An enzyme that unwinds double-strand DNA into two single DNA strands.
- Helical CAT scan
Helical computed axial tomography scan (CAT scan or CT scan) is another name for a CT scan, and is also called a spiral CT scan. Until approximately the mid to late 1990’s, CT images were obtained one slice at a time, with the patient table moving step by step through the gantry. Scans obtained using […]
- Helicobacter heilmannii
A bacterium that infects most cats, dogs, and pigs and causes them stomach inflammation (gastritis). H. heilmannii is not usually transmitted from animals to people, but people who have been infected by H. heilmannii are known to have developed gastric and duodenal ulcers. Antibiotics can cure H. heilmannii infections. H. heilmannii is closely related to […]