Many of the scientific terms found in the abstracts, articles and lay translations presented on our site are included in this section. We are continually adding terminology found in both new and existing documents.
| U and u | unhindered |
|---|
As U - symbol for uranium , uracil or uridine , international unit of enzyme activity , and unit .
As u - symbol for atomic mass unit .
Not hindered or impeded.
As U - symbol for uranium , uracil or uridine , international unit of enzyme activity , and unit .
As u - symbol for atomic mass unit .
The visualization of deep structures of the body by recording the reflections of (echoes of) pulses of ultrasonic waves directed into the tissues. Diagnostic ultrasonography, as in echocardiography and echoencephalography, utilizes a frequency range of 1 million to 10 million hertz (cycles per second), or 1 to 10 MHz. Such sound waves are transmissible only in liquids and solids. See also scan . Called also echography and sonography .
1. Insensible; incapable of responding to sensory stimuli and of having subjective experiences.
2. The part of the mind that is not readily accessible to conscious awareness by ordinary means but whose existence may be manifested in symptom formation, in dreams, or under the influence of drugs; it is one of the systems of Freud's topographic model of the mind.
In the electrocardiogram, a small positive deflection usually immediately following the T wave but often poorly separated from it and so concealed; it is postulated to represent repolarization of the Purkinje fibers or a mechanical event such as ventricular relaxation. It is not invariably present and is most often seen in tachyarrhythmias and electrolyte disturbances.
1. Mechanical radiant energy with a frequency greater than 20,000 hertz (cycles per second).
2. Ultrasonography.
Doppler ultrasound - That in which the shifts in frequency between emitted ultrasonic waves and their echoes are used to measure the velocities of moving objects, based on the principle of the Doppler effect. The waves may be continuous or pulsed; the technique is frequently used to examine cardiovascular blood flow.
The state of being insensible; incapable of responding to sensory stimuli and of having subjective experiences.
Urinary aquaporin-2.
The act of scanning using ultrasonography, or the data or image obtained by such use.
Not governed or controlled.
Urinary albumin excretion.
Beyong the violet end of the spectrum; said of electromagnetic rays or radiation between the violet rays and the x-rays, that is, with wavelengths between 200 and 400 nm. These rays have powerful actinic and chemical properties, inducing sunburn and tanning of the skin and producing ergocalciferol (vitamin D2) by their action on ergosterol in the skin.
Greasy or oily; oleaginous.
A small protein present in all eucaryotic cells (ubiquitous) that plays an important role in "tagging" other proteins destined (marked) for destruction (via proteolytic cleavage). Such proteins are then broken down and removed because they are damaged or no longer needed by the body. Such "tagged" protein molecules are said to have been ubiquitinated.
Those invisible rays of the spectrum which are beyond the violet rays; their wavelengths range between 4 and 400 nm. See also ultraviolet .
The theory that ascites associated with portal hypertension causes hypovolemia and so both a lowering of portal pressure and retention of sodium and water. The higher sodium concentration causes increases in the plasma volume and portal pressure, and the subsequent formation of ascites renews the cycle. See also overflow theory .
See ubiquitin .
See arteria umbilicalis .
Not capable of being discovered.
See ubiquitin .
The flexible structure connecting the umbilicus of the embryo and fetus with the placenta and giving passage to the umbilical arteries and vein. In the newborn it measures about 50 cm in length. First formed during the fifth embryonic week from the connecting stalk, it contains the omphalomesenteric duct (yolk stalk) and the allantois. Called also funiculus umbilicalis and chorda umbilicalis .
Not having been diagnosed.
Urine flow. (See JAR-291.)
See umbilicus (definition 2).
Anaplastic.
1. An open eroded sore of skin or mucous membrane often discharging pus.
2. Something that festers and corrupts like an open sore.
See vena umbilicalis .
Acute undifferentiated leukemia.
See definitions under "ulcer."
The pear-shaped expansion of the yolk sac growing out into the cavity of the chorion at the end of the fourth week of development, and joined to the midgut of the embryo by the yolk stalk.
In an undue manner; excessively.
The inner and larger bone of the forearm, on the side opposite that of the thumb; it articulates with the humerus and with the head of the radius at its proximal end, and with the radius and bones of the carpus at the distal end.
Shaped like or resembling the umbilicus.
Not having formed a linkage with a glycosyl group.
A centrifuge with an exceedingly high rate of rotation which will separate and sediment the molecules of a substance.
1. The navel: the cicatrix marking the site of attachment of the umbilical cord in the fetus. Called also omphalus .
2. The region of the abdomen surrounding the umbilicus; called also regio umbilicalis and umbilical region .
Singular: unguis.
1. Nails: the horny cutaneous plates on the dorsal surfaces of the distal ends of the terminal phalanges of the fingers or toes, made up of flattened epithelial scales developed from the stratum lucidum of the skin.
2. Nail-like parts or structures.
Filtration through filters with minute pores, thus allowing the separation of extremely minute particles. It occurs naturally, as in the filtration of plasma at the capillary membrane, and is also performed clinically and in the laboratory, such as in hemodialysis, where it involves the bulk movement of solute and solvent across the membrane down pressure gradients and is usually performed under pressure to accelerate the process.
With undiminished force, power, or vigor.
Plural: ungues.
1. Nail: the horny cutaneous plate on the dorsal surface of the distal end of the terminal phalanx of a finger or toe, made up of flattened epithelial scales developed from the stratum lucidum of the skin.
2. A collection of pus in the cornea; an onyx.
3. A nail-like part or structure.
The record obtained by ultrasonography.
Not characteristic; not typical.
Hoofed mammals. Formerly all classified into one order, they are now divided into the orders Artiodactyla and Perissodactyla.
Pertaining to or accomplished by ultrasonography; called also sonography .
The lipid - soluble form of bilirubin that circulates in loose association with the plasma proteins; called also indirect bilirubin .
Not hindered or impeded.