Category: X

Softening, desiccation, and ulceration of cornea resulting from dryness of the conjunctiva.  

A special photographic film with a sensitive emulsion layer that blackens in response to the light from intensifying screens. The emulsion has silver halide crystals immersed in gelatin. Single-emulsion film has the emulsion on one side of the cellulose base. It is used for digital, mammographic, and extremity imaging, in which high detail is necessary.…

A drug that constricts blood vessels. It acts rapidly and is long-lasting and is applied topically as a nasal decongestant in the relief of the common cold and sinusitis. Toxic effects are rare. Xylometazoline is a decongestant medication commonly employed in spray or drop forms to alleviate nasal congestion resulting from the common cold, sinusitis,…

A liquid used for increasing the transparency of tissues prepared for microscopic examination after they have been dehydrated. A mixture of isomeric dimethylbenzenes used in making lacquers and rubber cement.  

A genus of tropical and subtropical fleas, with some 40 species. The rat flea, X. cheopis, occasionally attacks man and can transmit plague from an infected rat population; it also transmits murine typhus and two tapeworms, Hymenolepis nana and H. diminuta. A genus of fleas belonging to the family Pulicidae, order Siphonaptera.  

A procedure for diagnosing infections transmitted by insect carriers. Uninfected insects of the species known to carry the disease in question are allowed to suck the blood of a patient suspected of having the disease. A positive diagnosis is made if the disease parasites appear in the insects. This method has proved invaluable for diagnosing…

Excess of the purine derivative xanthine in the urine, usually the result of an inborn defect of metabolism. It is both rare and symptomless. The excretion of large amounts of xanthine in the urine. The occurrence of xanthine in urine.  

The presence in the blood of the yellow pigment carotene, from excessive intake of carrots, tomatoes, or other vegetables containing the pigment. Yellow pigments present in the blood.  

Using an x-ray source which projects through the patient onto a fluorescent screen or image intensifier. Image-intensified fluoroscopy has replaced conventional fluoroscopy in current practice.  

A trait associated with a gene on the X sex chromosome. Any trait associated with a gene on the X chromosome will almost always be expressed in males, who have only one X chromosome. Women who inherit an X- linked disease gene are usually not affected by the disease because they have two X chromosomes…