Doppler effect (redirected from Doppler equations)

effect /ef·fect/ (ĕ-fekt´) the result produced by an action.

---

Anrep effect  abrupt elevation of aortic pressure results in a positive inotropic effect, augmented resistance to outflow in the heart.

Bayliss effect  increased perfusion pressure and subsequent stretch of vascular smooth muscle causes muscle contraction and increased resistance, which returns blood flow to normal in spite of the elevated perfusion pressure.

Bohr effect  increase of carbon dioxide in blood causes decreased affinity of hemoglobin for oxygen.

Doppler effect  the relationship of the apparent frequency of waves, as of sound, light, and radio waves, to the relative motion of the source of the waves and the observer, the frequency increasing as the two approach each other and decreasing as they move apart.

experimenter effects  demand characteristics.

Haldane effect  increased oxygenation of hemoglobin promotes dissociation of carbon dioxide.

position effect  in genetics, the changed effect produced by alteration of the relative positions of various genes on the chromosomes.

pressure effect  the sum of the changes that are due to obstruction of tissue drainage by pressure.

side effect  a consequence other than that for which an agent is used, especially an adverse effect on another organ system.

Somogyi effect  a rebound phenomenon occurring in diabetes: overtreatment with insulin induces hypoglycemia, which initiates the release of epinephrine, ACTH, glucagon, and growth hormone, which stimulate lipolysis, gluconeogenesis, and glycogenolysis, which, in turn, result in a rebound hyperglycemia and ketosis.

---

Doppler effect

n.

An apparent change in the frequency of waves, as of sound or light, occurring when the source and observer are in motion relative to each other, with the frequency increasing when the source and observer approach each other and decreasing when they move apart.

---

Doppler effect

The principle that the sound of an object moving toward you has a higher pitch than the sound when it is moving away from you.

Mentioned in: Doppler Ultrasonography

---

Doppler effect

Etymology: Christian J. Doppler; L, effectus

the apparent change in frequency of sound or light waves emitted by a source as it moves away from or toward an observer. The frequency increases as the source moves toward the observer and decreases as it moves away, as the rising pitch of the whistle of an approaching train and the falling pitch of a departing train. The Doppler effect is also observed in electromagnetic radiation, such as light and radio waves. Also called Doppler shift. See also electromagnetic radiation, ultrasonography, wavelength.

---

Doppler

an Austrian physicist and mathematician.

---

duplex Doppler imaging

see doppler ultrasound.

Doppler effect

the relationship of the apparent frequency of waves, as of sound, light and radio waves, to the relative motion of the source of the waves and the observer, the frequency increasing as the two approach each other and decreasing as they move apart.

The Doppler effect can be experienced when a train whistle or automobile horn produces a continuous sound as it approaches and passes a listener. The pitch of the sound suddenly falls as the source passes the listener.

Doppler shift

the change in frequency that occurs when high frequency sound waves are reflected from a moving surface; the basis for doppler ultrasound.