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Medical Dictionary     O
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  • O
    In chemistry, the abbreviation for ortho- (2).
  • O agglutinin
    an agglutinin that is formed as the result of stimulation by, and that reacts with, the relatively thermostable antigen(s) that are part of the cell wall of certain microorganisms; see ABO blood group, Blood Groups appendix.

    Alternate names: somatic agglutinin

  • O antigen
    somatic antigen of enteric gram-negative bacteria. External part of cell wall lipopolysaccharide; See ABO blood group, Blood Groups Appendix.

    See Also: H antigen1

  • O colony
    growth of a nonmotile bacterium in discrete, compact colonies in contrast to a film of growth produced by some motile bacteria.
  • O shell
    the outermost shell of electrons, so called because displacement of electrons causes an emission in the visible or optic range.
  • O'Dwyer tube
    a metal tube formerly used for intubation of the larynx in diphtheria.
  • O'Hara forceps
    two slender clamp forceps held together by a serrefine, once used in intestinal anastomosis; now obsolete.
  • O'nyong-nyong fever
    a denguelike disease caused by O'nyong-nyong virus, a member of the family Togaviridae, and transmitted by a mosquito, characterized by joint pains and notable lymphadenopathy followed by a maculopapular eruption of the face that extends to the trunk and extremities but fades in several days without desquamation.
  • o'nyong-nyong virus
    a virus of the genus Alphavirus, in the family Togaviridae, found in Uganda, Kenya, and the Republic of Congo, which causes o'nyong-nyong fever.
  • o-
  • O-(triethylaminoethyl) cellulose
  • O-acetylcarnitine
    The acetyl derivative of carnitine formed by carnitine acetyltransferase. Facilitates acetyl transport into the mitochondria and is an important fuel source for sperm.
  • O-acylcarnitine
    Condensation product of a carboxylic acid and carnitine; the transport form for a fatty acid crossing the inner mitochondrial membrane.
  • o-chlorobenzalmalononitrile
    A strong lacrimator that is an ingredient in chemical agents used in riot control.
  • O-diethylaminoethyl cellulose
    cellulose to which diethylaminoethyl groups have been attached; used in anion-exchange chromatography.

    Alternate names: DEAE-cellulose

  • O-phosphono-
    Prefix indicating a phosphonic acid radical (–PO3H2) attached through an oxygen atom, hence a phosphoric ester.

    See Also: phospho-

  • O-phosphoserine
    The phosphoric ester of serine; found as a constituent in many proteins (phosphorylase a and phosvitin).
  • o-phthalaldehyde
    A reagent used in the identification and the detection of amino acid.
  • O-R system
    abbreviation for oxidation-reduction system.
  • O-succinylhomoserine (thiol)-lyase
    An enzyme catalyzing the reaction between cystathionine and succinate to form l-cysteine and O-succinyl-l-homoserine.

    Alternate names: cystathionine γ-synthase

  • O.D.
    Abbreviation for L. omni die, every day.
  • O.U.
    Abbreviation for Latin oculus uterque, each eye or both eyes.
  • OA
    Abbreviation for occipitoanterior position.
  • OAC
    Abbreviation for oculoauriculovertebral dysplasia (syndrome).
  • OAE
    Abbreviation for otoacoustic emission.
  • oasthouse urine disease
    an autosomal recessively inherited metabolic defect in the absorption of methionine that is converted by intestinal bacteria to α-hydroxybutyric acid; characterized by diarrhea, tachypnea, and marked urinary excretion of α-hydroxybutyric acid (causing an odor like that of an oasthouse).
  • Oat cell cancer

    Oat cell cancer: A type of lung cancer in which the cells look like oats. Also called small cell lung cancer.

  • oath
    A solemn affirmation or attestation.
  • Oath of Maimonides

    Oath of Maimonides: A prayer that is said to have been written by the 12th-century physician-philosopher Moses Maimonides. Like the famous oath of Hippocrates, the prayer of Maimonides is often recited by new medical graduates. This prayer, which is also called the "Prayer of Moses Maimonides", is now thought to have been written, not by Maimonides, but by Marcus Herz, a German physician, pupil of the the German philosopher Immanual Kant, and physician to the great English philantropist Moses Mendelssohn. The prayer first appeared in print in 1793 which may be when it was written. Irrespective of who wrote it, it is an extraordinary prayer. It reads as follows: "Almighty God, Thou has created the human body with infinite wisdom. Ten thousand times ten thousand organs hast Thou combined in it that act unceasingly and harmoniously to preserve the whole in all its beauty the body which is the envelope of the immortal soul. They are ever acting in perfect order, agreement and accord. Yet, when the frailty of matter or the unbridling of passions deranges this order or interrupts this accord, then forces clash and the body crumbles into the primal dust from which it came. Thou sendest to man diseases as beneficent messengers to foretell approaching danger and to urge him to avert it. "Thou has blest Thine earth, Thy rivers and Thy mountains with healing substances; they enable Thy creatures to alleviate their sufferings and to heal their illnesses. Thou hast endowed man with the wisdom to relieve the suffering of his brother, to recognize his disorders, to extract the healing substances, to discover their powers and to prepare and to apply them to suit every ill. In Thine Eternal Providence Thou hast chosen me to watch over the life and health of Thy creatures. I am now about to apply myself to the duties of my profession. Support me, Almighty God, in these great labors that they may benefit mankind, for without Thy help not even the least thing will succeed. "Inspire me with love for my art and for Thy creatures. Do not allow thirst for profit, ambition for renown and admiration, to interfere with my profession, for these are the enemies of truth and of love for mankind and they can lead astray in the great task of attending to the welfare of Thy creatures. Preserve the strength of my body and of my soul that they ever be ready to cheerfully help and support rich and poor, good and bad, enemy as well as friend. In the sufferer let me see only the human being. Illumine my mind that it recognize what presents itself and that it may comprehend what is absent or hidden. Let it not fail to see what is visible, but do not permit it to arrogate to itself the power to see what cannot be seen, for delicate and indefinite are the bounds of the great art of caring for the lives and health of Thy creatures. Let me never be absent- minded. May no strange thoughts divert my attention at the bedside of the sick, or disturb my mind in its silent labors, for great and sacred are the thoughtful deliberations required to preserve the lives and health of Thy creatures. "Grant that my patients have confidence in me and my art and follow my directions and my counsel. Remove from their midst all charlatans and the whole host of officious relatives and know-all nurses, cruel people who arrogantly frustrate the wisest purposes of our art and often lead Thy creatures to their death. "Should those who are wiser than I wish to improve and instruct me, let my soul gratefully follow their guidance; for vast is the extent of our art. Should conceited fools, however, censure me, then let love for my profession steel me against them, so that I remain steadfast without regard for age, for reputation, or for honor, because surrender would bring to Thy creatures sickness and death. "Imbue my soul with gentleness and calmness when older colleagues, proud of their age, wish to displace me or to scorn me or disdainfully to teach me. May even this be of advantage to me, for they know many things of which I am ignorant, but let not their arrogance give me pain. For they are old and old age is not master of the passions. I also hope to attain old age upon this earth, before Thee, Almighty God! "Let me be contented in everything except in the great science of my profession. Never allow the thought to arise in me that I have attained to sufficient knowledge, but vouchsafe to me the strength, the leisure and the ambition ever to extend my knowledge. For art is great, but the mind of man is ever expanding. "Almighty God! Thou hast chosen me in Thy mercy to watch over the life and death of Thy creatures. I now apply myself to my profession. Support me in this great task so that it may benefit mankind, for without Thy help not even the least thing will succeed."

  • oatmeal-tomato paste agar
    a special culture medium for the production of ascospore formation in the dermatophytes.
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