Mindblown: a blog about philosophy.
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Xylenol
General name for a series of dimethylphenols found in the pine-type coal tar disinfectants.
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X-ray photon
An uncharged particle of energy, moving in waves produced by the interaction of high-speed electrons with a target (commonly tungsten).
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X-linked disorder
A disease caused by genes located on the X chromosome. Genetic conditions tied to the X chromosome are referred to as X-linked disorders. These primarily affect males because they have only one X chromosome. Examples of such conditions include hemophilia, fragile X syndrome, and color vision deficiencies.
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Xiphopagus
Symmetrical twins joined at the xiphoid process.
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Xiphopagotomy
Surgical separation of twins joined at the xiphoid process.
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Xiphoiditis
Inflammation of the xiphoid process. Discomfort in the xiphoid cartilage located at the lower end of the sternum.
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X inactivation
The silencing of the genes on one of a woman’s paired X chromosomes, allowing the other chromosome’s genes to be expressed phenotypically. The process is not universal but affects 75% or more of the genes on the chromosome. Genes that are found near the short end of the chromosome are more likely than the rest…
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X factor
A growth factor, identified as hemin, that is needed to grow the bacterium, Haemophilus influenzae in culture.
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Xerotocia
Dry labor caused by a diminished amount of amniotic fluid.
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Hereditary xerocytosis
A disorder of erythrocytes usually inherited as an autosomal dominant trait. A membrane defect in the red blood cells permits the loss of excess potassium ions and water, causing dehydration of the cells. Hemolysis and anemia range from mild to severe.
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