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mondofacto - Online Medical Dictionary Category: Health and Medicine > Medical Dictionary Date & country: 26/01/2008, UK Words: 116197

unipotent
Referring to those cells that produce a single type of daughter cell; e.g., a unipotent stem cell. ... Compare: pluripotent cells. ... (05 Mar 2000) ...

unique DNA
<molecular biology> Any nucleotide sequence in DNA that is found only once in a given genome. ... (09 Oct 1997) ...

unique identifier reporting
In public health, a system that uses information such as the person's birth date and part of their identification number (in the u.s., the social security number) to create a unique code that is reported instead of a name. It is an alternative to named reporting that provides some of the surveillance benefits of reporting by name, such as the elimi …

unique species
<biology> A biotic resource whose presence is unusual and of special interest due to extremities of range, special soil types, or unusual associations with other species. ... (09 Oct 1997) ...

unisexual
<biology> Describes an organism that is male or female, i.e., has the reproductive organs of only one sex. ... (09 Oct 1997) ...

unit
1. A single thing or person. ... 2. <mathematics> The least whole number; one. 'Units are the integral parts of any large number.' (I. Watts) ... 3. A gold coin of the reign of James I, of the value of twenty shillings. ... 4. Any determinate amount or quantity (as of length, time, heat, value) adopted as a standard of measurement for other amou …

unit character
<genetics> A particular trait or characteristic (usually controlled by a single gene or a set of inseparable genes) that is passed on as a unit in heredity. ... (09 Oct 1997) ...

unit dose
Occurring in or using a single dose, seen as a standard of measurement. ... (18 Nov 1997) ...

unit fibrils
The fibril's that comprise a collagen fibre, ranging from 20 to 200 nm and averaging about 100 nm in diameter (substantially larger in tendons), with cross-striations averaging 64 nm. ... Synonym: collagen fibrils. ... (05 Mar 2000) ...

unit membrane
<cell biology> The three ply, approximately 7nm wide membrane structure found in all cells, composed of a fluid lipid bilayer with intercalated proteins. The unit membrane theory carries with it the presumption that all biological membranes have basically the same structure. ... (18 Nov 1997) ...

unit of convergence
See: meter angle. ... (05 Mar 2000) ...

unit of energy
CGS system: erg, joule, MKS system: newton-meter (joule), FPS system: foot-poundal,gravitational unit: gram-centimeter, gram-meter, kilogram-meter, foot-pound,SI: joule. ... (05 Mar 2000) ...

unit of force
CGS system: dyne, FPS system: poundal, MKS system: newton,SI: newton. ... (05 Mar 2000) ...

unit of heat
Calorie (gram calorie; kilocalorie) ... Synonym: British thermal unit. ... Synonym: joule. ... (05 Mar 2000) ...

unit of intermedin
A unit based upon the action of the hormone in causing the expansion of the melanophores in a hypophysectomised frog; equal to 1 ug of alkali-treated USP Posterior-pituitary Reference Standard. ... (05 Mar 2000) ...

unit of length
Metric system and SI: meter, CGS system: centimeter, variable in the English system: inch for short distances, foot for moderate distances and for elevation, mile for long distances. ... (05 Mar 2000) ...

unit of light
See: candela, lux. ... (05 Mar 2000) ...

unit of magnetic field intensity
See: gauss, tesla. ... (05 Mar 2000) ...

unit of mass
Metric system: gram, SI: kilogram, english system: pound. ... (05 Mar 2000) ...

unit of ocular convergence
Synonym for meter angle ... The amount of convergence required to view binocularly an object 1 meter distant and exerting 1 diopter of accommodation. ... Synonym: unit of ocular convergence. ... (05 Mar 2000) ...

unit of oxytocin
The oxytocic activity of 0.5 mg of the USP Posterior-pituitary Reference Standard; 1 mg of synthetic oxytocin corresponds to 500 IU. ... (05 Mar 2000) ...

unit of penicillin
The penicillin activity of 0.6 ug of penicillin G. ... (05 Mar 2000) ...

unit of radioactivity
See: Becquerel. ... (05 Mar 2000) ...

unit of thyrotrophic activity
The activity of an amount of an extract of the anterior lobe of the hypophysis which, given daily for 5 days, will cause the thyroid of a guinea pig (weighing 200 g) to reach a weight of 600 mg. ... (05 Mar 2000) ...

unit of vasopressin
The pressor activity of 0.5 mg of the USP Posterior-pituitary Reference Standard; 1 mg of synthetic vasopressin corresponds to 600 IU. ... (05 Mar 2000) ...

unit of wavelength
See: Angstrom, nanometer. ... (05 Mar 2000) ...

unit of weight
See: unit of mass. ... (05 Mar 2000) ...

unit of work
See: unit of energy. ... (05 Mar 2000) ...

unitary
1. Of or pertaining to a unit or units; relating to unity; as, the unitary method in arithmetic. ... 2. Of the nature of a unit; not divided; united. ... <chemistry> Unitary theory, the modern theory that the molecules of all complete compounds are units, whose parts are bound together in definite structure, with mutual and reciprocal influence …

united arab emirates
A federation of seven states on the southeast portion of the arabian peninsula: abu dhabi, ajman, dubai, fujairah, ras al-khaimah, sharjah and umm al-qaiwain. In 1820 a treaty of peace was concluded between great britain and native rulers. During the 19th century the rulers agreed to suppression of the slave trade and restriction of foreign relatio …

united nations
An international organization whose members include most of the sovereign nations of the world with headquarters in new york city. The primary objectives of the organization are to maintain peace and security and to achieve international cooperation in solving international economic, social, cultural, or humanitarian problems. ... (12 Dec 1998) ...

United States Adopted Names
Designation for nonproprietary names (for drugs) adopted by the USAN Council in cooperation with the manufacturers concerned; the designation USAN is applicable only to nonproprietary names coined since June 1961. ... (05 Mar 2000) ...

united states indian health service
A division of the united states public health service that is responsible for the public health and the provision of medical services to native american indian populations in the united states, primarily those residing on reservation lands. ... (12 Dec 1998) ...

united states public health service
See: USPHS. ... (12 Dec 1998) ...

unithiol
<chemical> A chelating agent used as an antidote to heavy metal poisoning. ... Pharmacological action: antidotes, chelating agents. ... Chemical name: 1-Propanesulfonic acid, 2,3-dimercapto-, monosodium salt ... (12 Dec 1998) ...

uniting canal
Synonym for uniting duct ... A short membranous tube passing from the lower end of the saccule to the cochlear duct of the membranous labyrinth. ... Synonym: ductus reuniens, canaliculus reuniens, canalis reuniens, Hensen's canal, Hensen's duct, uniting canal. ... (05 Mar 2000) ...

uniting cartilage
Synonym for connecting cartilage ... The cartilage in a cartilaginous joint such as the symphysis pubis. ... Synonym: interosseous cartilage, uniting cartilage. ... (05 Mar 2000) ...

uniting duct
A short membranous tube passing from the lower end of the saccule to the cochlear duct of the membranous labyrinth. ... Synonym: ductus reuniens, canaliculus reuniens, canalis reuniens, Hensen's canal, Hensen's duct, uniting canal. ... (05 Mar 2000) ...

units
<physics> Standard quantities of measurement which are specific to a type of measurement, i.e. The metre is the standard unit of measurement for length in the MKS system of measurement. (see also SI unit, MKS, CGS) ... (09 Oct 1997) ...

unity
Origin: OE. Unite, F. Unite, L. Unitas, from unus one. See One, and cf. Unit. ... 1. The state of being one; oneness. 'Whatever we can consider as one thing suggests to the understanding the idea of unity.' (Locks) ... Unity is affirmed of a simple substance or indivisible monad, or of several particles or parts so intimately and closely united as to …

univalent antibody
An 'incomplete' form of antibody that may coat antigen, but which according to the 'lattice theory' does not have a second receptor for attachment to another molecule of antigen; in the case of Rh+ erythrocytes, such an anti-Rh antibody may coat the cells but not cause them to agglutinate in saline; however, agglutination does occur when such coate …

univalve
<zoology> A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs. ... most univalves are spiral and are the shells of gastropods, but many belong to cephalopods and pteropods. A large number of univalves belonging to the gastropods are conical, cup-shaped, or shieldlike, as the limpe …

univalvular
<botany> Same as Univalve. ... (01 Mar 1998) ...

univentricular connections
Connections in which one of the atrial chambers is connected to a ventricle, but the other has no connection with the ventricular mass at all. ... (05 Mar 2000) ...

univentricular heart
An anomaly in which all blood flows through one ventricle or in which the arterioventricular valves are committed to empty into only one chamber in the ventricular mass. ... (05 Mar 2000) ...

universal
1. Of or pertaining to the universe; extending to, including, or affecting, the whole number, quantity, or space; unlimited; general; all-reaching; all-pervading; as, universal ruin; universal good; universal benevolence or benefice. 'Anointed universal King.' 'The universal cause Acts not by partial, but by general laws.' (Pope) 'This universal fr …

universal antidote
<pharmacology> A preparation of activated charcoal that can adsorb and therefore neutralise many toxic chemicals. ... (09 Oct 1997) ...

universal appliance
A combination of the edgewise and ribbon arch appliance techniques, affording precise control of individual teeth in all planes of space. ... (05 Mar 2000) ...

universal coverage
Health insurance coverage for all persons in a state or country, rather than for some subset of the population. It may extend to the unemployed as well as to the employed; to aliens as well as to citisens; for pre-existing conditions as well as for current illnesses; for mental as well as for physical conditions. ... (12 Dec 1998) ...

universal donor
In blood grouping, a person belonging to group O; i.e., one whose erythrocytes do not contain either agglutinogen A or B and are, therefore, not agglutinated by plasma containing either of the ordinary isoagglutinins, alpha or beta. ... (05 Mar 2000) ...

universal gas constant
<radiobiology> R = 8.314 x 10^7 ergs per degree C per mole. ... (09 Oct 1997) ...

universal infantilism
Synonym for idiopathic infantilism ... Dwarfism generally associated with hypogonadism; may be caused by deficient secretion of anterior pituitary hormones. ... Synonym: Lorain's disease, proportionate infantilism, universal infantilism. ... (05 Mar 2000) ...

universal instability
<radiobiology> Low-frequency instability resulting from the presence of density gradients perpendicular to the magnetic field lines. An instability of this type is generally localised and usually has a small rate of growth. ... (09 Oct 1997) ...

universal precautions
Prudent standard preventive measures to be taken by professional and other health personnel in contact with persons afflicted with a communicable disease, to avoid contracting the disease by contagion or infection. Precautions are especially applicable in the diagnosis and care of aids patients. ... (12 Dec 1998) ...

universal solvent
A substance sought by the alchemists, and claimed by some to have been found, supposedly capable of dissolving all substances; sometimes, in a physiological sense, applied to water. ... (05 Mar 2000) ...

universal tube
A straight, cylindrical glass vial that holds about 25 millilitres and istopped with a screw-on cap. ... (09 Oct 1997) ...

universities
Educational institutions providing facilities for teaching and research and authorised to grant academic degrees. ... (12 Dec 1998) ...

university
Origin: OE. Universite, L. Universitas all together, the whole, the universe, a number of persons associated into one body, a society, corporation, fr. Universus all together, universal: cf. F. Universite. See Universe. ... 1. The universe; the whole. ... 2. An association, society, guild, or corporation, especially. One capable of having and acquiri …

unlimited
1. Not limited; having no bounds; boundless; as, an unlimited expanse of ocean. ... 2. Undefined; indefinite; not bounded by proper exceptions; as, unlimited terms. 'Nothing doth more prevail than unlimited generalities.' ... 3. Unconfined; not restrained; unrestricted. 'Ascribe not unto God such an unlimited exercise of mercy as may destroy his just …

unman
1. To deprive of the distinctive qualities of a human being, as reason, or the like. ... 2. To emasculate; to deprive of virility. ... 3. To deprive of the courage and fortitude of a man; to break or subdue the manly spirit in; to cause to despond; to dishearten; to make womanish. 'Let's not unman each other.' (Byron) ... 4. To deprive of men; as, to …

unmanned
1. Deprived of manly qualities; deficient in vigor, strength, courage, etc.; weak; effeminate. ... 2. <veterinary> Not tamed; not made familiar with, or subject to, man; also used figuratively. 'Hood my unmanned blood bating in my cheeks With thy black mantle.' (Shak) ... 3. Not furnished with men; as, an unmanned ship. ... Source: Websters Dict …

unmedullated
Synonym for unmyelinated ... Denoting nerve fibres (axons) lacking a myelin sheath. ... Synonym: amyelinated, amyelinic, nonmedullated, nonmyelinated, unmedullated. ... (05 Mar 2000) ...

unmyelinated
Denoting nerve fibres (axons) lacking a myelin sheath. ... Synonym: amyelinated, amyelinic, nonmedullated, nonmyelinated, unmedullated. ... (05 Mar 2000) ...

unmyelinated fibres
A fibre having no myelin covering (CNS); a naked axon; in the PNS represented by all axons lying in troughs in a single Schwann cell (Schwann cell unit); a slow conducting fibre. ... Synonym: gray fibres, nonmedullated fibres, Remak's fibres. ... (05 Mar 2000) ...

unmyelinated nerve
<anatomy, nerve> A nerve made up largely, or exclusively, of unmyelinated fibres; a nerve composed of axons having no myelin covering, but lying in troughs in Schwann cells; a slow conducting nerve. ... (05 Mar 2000) ...

Unna-Pappenheim stain
<technique> A contrast stain consisting of a methyl green-pyronin solution; originally used for gonococci, but later used to detect RNA and DNA in tissue sections; RNA is stained red and DNA appears green; used to demonstrate plasma cells during chronic inflammation. ... See: methyl green-pyronin stain. ... (05 Mar 2000) ...

Unna-Taenzer stain
Synonym for Taenzer's stain ... <technique> An orcein solution used for staining elastic tissue. ... Synonym: Unna-Taenzer stain. ... (05 Mar 2000) ...

Unna, Paul
<person> German dermatologist and staining expert, 1850-1929. ... See: Unna's disease, Unna's mark, Unna's stain, Unna-Pappenheim stain, Unna-Taenzer stain. ... (05 Mar 2000) ...

Unna's disease
Synonym for seborrheic dermatitis ... <dermatology> A form of inflammatory skin rash that results from an over activity of the sebaceous glands in the skin. Treatment often includes a mild hydrocortisone-containing cream. ... (27 Sep 1997) ...

Unna's mark
Synonym for nape nevus ... A pale vascular birthmark found on the nape of the neck in 25 to 50% of normal persons. ... Synonym: Unna's mark. ... (05 Mar 2000) ...

Unna's stain
<technique> An alkaline methylene blue stain for plasma cells, a polychrome methylene blue stain with which mast cells are stained red (metachromatic). ... (05 Mar 2000) ...

unnecessary procedures
Diagnostic, therapeutic, and investigative procedures prescribed and performed by health professionals, the results of which do not justify the benefits or hazards and costs to the patient. ... (12 Dec 1998) ...

unpaired allosome
Synonym for accessory chromosome ... A chromosome existing without its normal homologous chromosome; at the reduction division of gametogenesis an accessory chromosome is likely to be included in one daughter cell and not in the other, but may be lost completely by lagging behind on the equatorial plate. ... Synonym: monosome, odd chromosome, unpaire …

unpaired chromosome
Synonym for accessory chromosome ... A chromosome existing without its normal homologous chromosome; at the reduction division of gametogenesis an accessory chromosome is likely to be included in one daughter cell and not in the other, but may be lost completely by lagging behind on the equatorial plate. ... Synonym: monosome, odd chromosome, unpaire …

unphysiological
Pertaining to conditions in the organism which are abnormal; can be used to refer to subjecting the body to abnormal amounts of substances normally present. ... (05 Mar 2000) ...

unpolarized light
<microscopy> A bundle of light rays having a common propagation direction but different vibration directions. ... (05 Aug 1998) ...

unpossible
Synonym for impossible ... An impossibility. ''Madam,' quoth he, 'this were an impossible!'' (Chaucer) ... Not possible; incapable of being done, of existing, etc.; unattainable in the nature of things, or by means at command; insuperably difficult under the circumstances; absurd or impracticable; not feasible. 'With men this is impossible; but with …

unresolved pneumonia
Pneumonia in which the alveolar exudate persists and eventually undergoes fibrosis. ... (05 Mar 2000) ...

unroofed coronary sinus syndrome
<syndrome> A spectrum of cardiac anomalies in which part or all of the common wall between the coronary sinus and the left atrium is absent. ... (05 Mar 2000) ...

unsanitary
Synonym for insanitary ... Injurious to health, usually in reference to an unclean or contaminated environment. ... Synonym: unsanitary. ... Origin: L. In-neg. + sanus, sound ... (05 Mar 2000) ...

unsaturated alcohols
Those alcohol's whose carbon chains contain one or more double or triple bonds. ... (05 Mar 2000) ...

unsaturated fat
<biochemistry> A fat that contains a carbon-carbon double bond, or a fat containing unsaturated fatty acids, such a fatty acid has double or triple covalent bonds and is thus able to add more atoms. Unsaturated fats are believed to lower blood cholesterol levels and are found at high levels in vegetable oils (olive oil, safflower oil, etc.) A …

unsaturated fatty acid
<biochemistry> Fatty acid with one or more double bonds. ... (18 Nov 1997) ...

unscheduled DNA synthesis
<cell biology, molecular biology> Any synthesis of DNA that happens ouside the S phase of the cell cycle. ... (13 Nov 1997) ...

unsharp masking
In radiography, superimposing a blurred negative of a radiograph to cancel large density differences, leaving fine detail more visible. ... (05 Mar 2000) ...

unsoundness
In a horse, any deviation in form or function from the normal that interferes with the animal's usefulness. ... (05 Mar 2000) ...

unstable angina
<cardiology> Angina which is new onset or prior existing angina which is increasing in severity, duration or frequency. ... (13 Nov 1997) ...

unstable bladder
Characterised by uninhibited detrusor contractions. ... (05 Mar 2000) ...

unstable cervical spine fractures
<radiology> Flexion: bilateral interfacetal dislocation, flexion teardrop fracture (usually C5 or C6) extension: extension teardrop fracture (usually C2 or C3), hangman's fracture, extension-dislocation, extension-fracture-dislocation, odontoid fracture vertical compression: Jefferson burst fracture see: cervical spine fractures ... (12 Dec 19 …

unstable colloid
Synonym for irreversible colloid ... A colloid that is not again soluble in water after having been dried at ordinary temperature. ... Synonym: unstable colloid. ... (05 Mar 2000) ...

unstable fracture
A fracture with an intrinsic tendency to slip out of place after reduction. ... (05 Mar 2000) ...

unstable haemoglobins
A group of rare Hb's with amino acid substitutions (or amino acid deletions in three types) that alter the three-dimensional shape of the globin in a manner that renders the molecule unstable; they have an increased but variable tendency to auto-oxidation and Heinz body formation and are associated with congenital nonspherocytic haemolytic anaemia. …

unstable mutation
<molecular biology> A mutation that has a high likelihood of reverting to its original form. ... (13 Nov 1997) ...

unstable patient
The distinction of stability is made by a physician and based on a large number of variables: patient diagnosis, vital signs, physical findings, laboratory findings, subjective factors and patient prognosis. ... (27 Sep 1997) ...

unstrained jaw relation
Synonym for rest relation ... The postural relation of the mandible to the maxillae when the patient is resting comfortably in the upright position and the condyles are in a neutral unstrained position in the glenoid fossa. ... Synonym: rest jaw relation, unstrained jaw relation. ... (05 Mar 2000) ...

unstriated
Without striations; not striped; denoting the structure of the smooth or involuntary muscles. ... (05 Mar 2000) ...

unstriated muscle
Synonym for smooth muscle ... <anatomy, pathology, physiology> Muscle tissue in vertebrates made up from long tapering cells that may be anything from 20-500m long. ... Smooth muscle is generally involuntary and differs from striated muscle in the much higher actin/myosin ratio, the absence of conspicuous sarcomeres and the ability to contract …

unsuitable area
Areas not appropriate for timber harvest due to fragile or shallow soils, scenic values, special wildlife habitat areas, and riparian or wetland values, among other possible reasons. ... (05 Dec 1998) ...

unsymmetrical
1. Wanting in symmetry, or due proportion pf parts. ... 2. <biology> Not symmetrical; being without symmetry, as the parts of a flower when similar parts are of different size and shape, or when the parts of successive circles differ in number. See Symmetry. ... 3. <chemistry> Being without symmetry of chemical structure or relation; as, …

unsystematised delusion
One of a group of apparently discrete, disconnected delusion's. ... (05 Mar 2000) ...