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

photodynamic
Relating to the energy or force exerted by light. ... Origin: photo-+ G. Dynamis, force ... (05 Mar 2000) ...

photodynamic radiation therapy
<oncology, technique> A light sensitive drug is given through a vein and concentrates in the tumour. Then, during a surgical procedure, a special light activates the drug. The activated drug kills tumour cells. ... (31 Dec 1997) ...

photodynamic sensitization
The action by which certain substances, notably fluorescing dyes (acridine, eosin, methylene blue, rose bengal) absorb visible light and emit the energy at wavelengths that are deleterious to microbes or other organisms in the dye-containing suspension, or selectively destroy cancer cells sensitised by intravenous porphyrin and exposed to red laser …

photodynamic therapy
<oncology, technique> Cancer treatment that uses the interaction between laser light and a substance that makes cells more sensitive to light. When light is applied to cells that have been treated with this substance, a chemical reaction occurs and destroys cancer cells. ... (31 Dec 1997) ...

photodynesis
<cell biology> Initiation of cytoplasmic streaming by light. Uncommon usage. ... (18 Nov 1997) ...

photodynia
Synonym: photalgia. ... Origin: photo-+ G. Odyne, pain ... (05 Mar 2000) ...

photodysphoria
Extreme photophobia. ... Origin: photo-+ G. Dysphoria, extreme discomfort ... (05 Mar 2000) ...

photoelectric
<physics> Acting by the operation of both light and electricity. Said of apparatus for producing pictures by electric light or electronic effects produced by the action of light. ... See: photoelectric effect, photoelectric absorption. ... (21 Jun 2000) ...

photoelectric absorption
<chemistry, physics> The interaction of an X-ray photon with matter in which the incident photon is completely absorbed, giving up all its energy by displacing an outer shell electron. ... (05 Mar 2000) ...

photoelectric effect
<chemistry, radiobiology> The interaction of a photon with an atom, resulting in the absorption of the incident photon and the release of a bound electron from that atom with energy equal to the photon energy less the electron binding energy. ... (16 Dec 1997) ...

photoelectrometer
A device employing a photoelectric cell for measuring the concentration of substances in solution. ... (05 Mar 2000) ...

photoelectron
An electron freed by the action of light. ... (05 Mar 2000) ...

photoerythema
Erythema caused by exposure to light. ... Origin: photo-+ G. Erythema, flush ... (05 Mar 2000) ...

photoesthetic
Sensitive to light. ... Origin: photo-+ G. Aisthesis, sensation ... (05 Mar 2000) ...

photofluorography
The photography of images produced on a fluorescent screen by X-rays. ... (12 Dec 1998) ...

photogastroscope
<instrument> An instrument for taking photographs of the interior of the stomach. ... Origin: photo-+ G. Gaster, stomach, + skopeo, to view ... (05 Mar 2000) ...

photogenesis
Production of light, as by bacteria, insects, or phosphorescence. ... Origin: photo-+ G. Genesis, production ... (05 Mar 2000) ...

photogenic
Photogenous ... Denoting or capable of photogenesis. ... (05 Mar 2000) ...

photogenic epilepsy
A form of reflex epilepsy precipitated by light. ... (05 Mar 2000) ...

photogrammetry
Making measurements by the use of stereoscopic photographs. ... (12 Dec 1998) ...

photograph
A picture or likeness obtained by photography. ... Origin: Photo- + -graph. ... To take a picture or likeness of by means of photography; as, to photograph a view; to photograph a group. 'He makes his pen drawing on white paper, and they are afterwards photographed on wood.' (Hamerton) ... Also used figuratively. 'He is photographed on my mind.' (Lady …

photographic
Synonym for photographical ... Of or pertaining to photography; obtained by photography; used ib photography; as a photographic picture; a photographic camera. Photograph'ically, Photographic printing, the process of obtaining pictures, as on chemically prepared paper, from photographic negatives, by exposure to light. ... Origin: Cf. F. Photographiq …

photographical
Of or pertaining to photography; obtained by photography; used ib photography; as a photographic picture; a photographic camera. Photograph'ically, Photographic printing, the process of obtaining pictures, as on chemically prepared paper, from photographic negatives, by exposure to light. ... Origin: Cf. F. Photographique. ... Source: Websters Dictio …

photographometer
<apparatus, photography> An instrument for determining the sensibility of the plates employed in photographic processes to luminous rays. ... (24 Mar 1998) ...

photography
1. The science which relates to the action of light on sensitive bodies in the production of pictures, the fixation of images, and the like. ... 2. The art or process of producing pictures by this action of light. ... The well-focused optical image is thrown on a surface of metal, glass, paper, or other suitable substance, coated with collodion or ge …

photohemotachometer
An appliance for recording photographically the rapidity of the blood current. ... Origin: photo-+ G. Haima, blood, + tachos, speed, + metron, measure ... (05 Mar 2000) ...

photoheterotroph
An organism that depends on light for most of its energy and principally on organic compounds for its carbon. ... Compare: photoautotroph, photolithotroph, phototroph. ... Origin: photo-+ G. Heteros, other, + trophe, nourishment ... (05 Mar 2000) ...

photoheterotrophic
Pertaining to a photoheterotroph. ... (05 Mar 2000) ...

photohetrotroph
<biology> An organism using light as a source of energy and organic materials as carbon source. ... (09 Oct 1997) ...

photoinactivation
Inactivation by light; e.g., as in the treatment of herpes simplex by local application of a photoactive dye followed by exposure to a fluorescent lamp. ... (05 Mar 2000) ...

photokeratoscope
<instrument> A keratoscope fitted with a still film camera. ... (05 Mar 2000) ...

photokinesis
Alteration of random movements of motile organisms in response to light. ... Origin: photo-+ G. Kinesis, movement ... (05 Mar 2000) ...

photokinetic
1. Pertaining to photokinesis. ... 2. Pertaining to photokinetics. ... (05 Mar 2000) ...

photokinetics
The changes in rate of a chemical reaction in response to light. ... Origin: photo-+ G. Kinetikos, relating to movement ... (05 Mar 2000) ...

photokymograph
A device for moving film at a constant speed so that a continuous record of a physiologic event may be obtained, as by a beam of light shining on the film. ... Origin: photo-+ G. Kyma, wave, + grapho, to record ... (05 Mar 2000) ...

photolithotroph
An organism that requires inorganic compounds and that uses light for most of its energy need. ... Compare: photoautotroph, photoheterotroph, phototroph. ... Origin: photo-+ G. Lithos, stone, mineral, + trophe, nourishment ... (05 Mar 2000) ...

photoluminescent
Having the ability to become luminescent upon exposure to visible light. ... Origin: photo-+ L. Lumen, light ... (05 Mar 2000) ...

photolyase
See: deoxyribodipyrimidine photolyase. ... Origin: photo-+ G. Lyo, to loosen, + -ase ... (05 Mar 2000) ...

photolysis
<chemistry> Light induced cleavage of a chemical bond, as in the process of photosynthesis. ... (18 Nov 1997) ...

photolyte
Any product of decomposition by light. ... (05 Mar 2000) ...

photolytic
Pertaining to photolysis. ... (05 Mar 2000) ...

photomacrograph
<microscopy> Photograph in the magnification range of conventional macrophotography (less than ~40X) taken with a single lens system, often a microscope objective. ... (05 Aug 1998) ...

photomacrography
<microscopy> Close-up photography at a limiting magnification of 40X or thereabouts and taken with a single lens system such as a A HREF=photomacrographic lens> Photomacrographic lens or a microscope objective. ... (05 Aug 1998) ...

photomania
<psychiatry> Morbid or exaggerated desire for light. ... Origin: photo-+ G. Mania, frenzy ... (05 Mar 2000) ...

photometer
<apparatus, physics> An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power. ... Origin: Photo: cf. F. Photometre. ... (24 Mar 1998) ...

photometry
The measurement of the intensity of light. ... (05 Mar 2000) ...

photomicrograph
<microscopy> An image enlarges approximately 40X or higher, produced by light, cf., electron micrograph. ... (05 Aug 1998) ...

photomicrography
<microscopy> This term should not be reversed into microphotography. A photomicrograph is a photograph of a small object, the image of which is magnified more than approximately 40X by means of a compound microscope. A microphotograph is a small photograph, requiring an enlargement or a lens system in order to view it, the image is minified.< …

photomultiplier tube
A detector which amplifies a signal (by as much as 106) of electromagnetic radiation by an acceleration of electrons released from a photocathode through a series of dynodes; as each electron strikes a dynode stage, 3 to 4 electrons are liberated and accelerated to the subsequent dynode. ... (05 Mar 2000) ...

photomyoclonus
Clonic spasms of muscles in response to visual stimuli. ... Origin: photo-+ G. Mys, muscle, + klonos, confused motion ... Hereditary photomyoclonus, photomyoclonus associated with diabetes mellitus, deafness, nephropathy, and cerebral dyfunction. ... (05 Mar 2000) ...

photon
<physics> A quantum unit of light energy. ... (09 Oct 1997) ...

photon density
The number of counted events recorded in scintigraphy per square centimeter or per square inch of imaged area. ... Synonym: count density. ... (05 Mar 2000) ...

photoncia
Any swelling resulting from the intense action of light. ... Origin: photo-+ G. Onkos, a mass (tumour) ... (05 Mar 2000) ...

photonosus
Any disease caused by excessive exposure to or unusual intensity of light, or resulting from phototoxicity or photoallergy. ... Synonym: photopathy. ... Origin: photo-+ G. Nosos, disease ... (05 Mar 2000) ...

photons
Discrete concentrations of energy, apparently massless elementary particles, that move at the speed of light. They are the unit or quantum of electromagnetic radiation. Photons are emitted when electrons move from one energy state to another. ... (12 Dec 1998) ...

photooxidase
<enzyme> Rhodoquinone accepts electrons from ubiquinone during chromatophore photooxidase activity ... Registry number: EC 1.6.99.- ... Synonym: rhodoquinone photooxidase ... (26 Jun 1999) ...

photopathy
Synonym: photonosus. ... Origin: photo-+ G. Pathos, suffering ... (05 Mar 2000) ...

photopeak
The characteristic energies of photons emitted by a radionuclide, used to set scanning parameters. ... (05 Mar 2000) ...

photoperceptive
Capable of both receiving and perceiving light. ... (05 Mar 2000) ...

photoperiod
<ecology> Recurring cycle of light and dark periods. The natural photoperiod is approximately 24 hours, and the ratio of light to dark hours slowly changes over the course of a year. In controlled experiments, the photoperiod is usually (but not necessarily) retained at 24 hours, and the light:dark ratio is typically constant. ... (09 Oct 1997 …

photoperiodism
<biology> Events triggered by duration of illumination or pattern of light/dark cycles: often the wavelength of the illuminating light is important as for example in control of circadian rhythm in plants. ... See: phytochromes. ... (18 Nov 1997) ...

photopheresis
A process in which peripheral blood is exposed in an extracorporeal flow system to photoactivated 8-methoxypsoralen (methoxsalen) and ultraviolet light - a procedure known as puva therapy. Photopheresis is at present a standard therapy for advanced cutaneous T-cell lymphoma; it shows promise in the treatment of autoimmune diseases. ... (12 Dec 1998) …

photophobia
<psychology, symptom> An abnormal visual intolerance of light. ... Origin: Gr. Phobos = fear ... (16 Mar 1998) ...

photophobic
Relating to or suffering from photophobia. ... (05 Mar 2000) ...

photophore
1. A lamp with reflector used in laryngoscopy and in the examination of other internal parts of the body. ... 2. In bacteriology, the organ producing intracellular bioluminescence in certain organisms. ... Origin: photo-+ G. Phoros, bearing ... (05 Mar 2000) ...

photophoresis
See: extracorporeal photophoresis. ... Extracorporeal photophoresis, destruction of cells separated from blood in an extracorporeal flow system by ultraviolet activation of chemotherapeutic agents such as psoralens. ... (05 Mar 2000) ...

photophosphorylation
<plant biology> The synthesis of ATP that takes place during photosynthesis. In noncyclic photophosphorylation the photolysis of water produces electrons that generate a proton motive force which is used to produce ATP, the electrons finally being used to reduce NADP to NADPH. ... When the cellular ratio of reduced to nonreduced NADP is high, …

photophthalmia
Keratoconjunctivitis caused by ultraviolet energy, as in snow blindness, exposure to an ultraviolet lamp, arc welding, or the short circuit of a high-tension electric current. ... See: photoretinopathy. ... Origin: photo-+ G. Ophthalmos, eye ... (05 Mar 2000) ...

photopia
Synonym: photopic vision. ... Origin: photo-+ G. Opsis, vision ... (05 Mar 2000) ...

photopic
Pertaining to photopic vision. ... (05 Mar 2000) ...

photopic adaptation
Synonym for light adaptation ... The visual adjustment occurring under increased illumination in which the retinal sensitivity to light is reduced. ... See: light-adapted eye. ... Synonym: photopic adaptation. ... (05 Mar 2000) ...

photopic eye
Synonym for light-adapted eye ... An eye that has been exposed to light, with bleaching of rhodopsin (visual purple) and insensitivity to low illumination. ... Synonym: photopic eye. ... (05 Mar 2000) ...

photopic vision
Vision when the eye is light-adapted. ... See: light adaptation, light-adapted eye. ... Synonym: cone vision, photopia. ... (05 Mar 2000) ...

photopigment
<plant biology> Pigment involved in photosynthesis in plants. Includes chlorophyll, carotenoids and phycobilins. ... (31 Dec 1997) ...

photoplethysmography
Plethysmographic determination in which the intensity of light reflected from the skin surface and the red cells below is measured to determine the blood volume of the respective area. There are two types, transmission and reflectance. ... (12 Dec 1998) ...

photopsia
<medicine> An affection of the eye, in which the patient perceives luminous rays, flashes, coruscations, etc. See phosphene. ... Origin: Gr. Opsis = vision ... (09 Mar 1998) ...

photopsin
The protein moiety (opsin) of the pigment (iodopsin) in the cones of the retina. ... (05 Mar 2000) ...

photopsy
Synonym for photopsia ... <medicine> An affection of the eye, in which the patient perceives luminous rays, flashes, coruscations, etc. See phosphene. ... Origin: Gr. Opsis = vision ... (09 Mar 1998) ...

physiologic vertigo
Synonym for space sickness ... Dizziness as result of changes in inner ear resulting from absence of gravity. ... Synonym: physiologic vertigo. ... (05 Mar 2000) ...

physiology
<study> The study of how living organisms function. ... (09 Oct 1997) ...

physiomedical
Denoting the use of physical rather than medicinal measures in the treatment of disease. ... (05 Mar 2000) ...

physiopathologic
Relating to pathologic physiology. ... (05 Mar 2000) ...

physiopathology
Synonym for pathologic physiology ... That part of the science of disease concerned with disordered function, as distinguished from anatomical lesions. ... Synonym: physiopathology. ... (05 Mar 2000) ...

physiopsychic
Pertaining to both mind and body. ... (05 Mar 2000) ...

physiopyrexia
Fever produced by a physical agent. ... Origin: physio-+ G. Pyrexis, feverishness ... (05 Mar 2000) ...

physiotherapeutic
Pertaining to physical therapy. ... (05 Mar 2000) ...

physiotherapist
A physical therapist. ... See: physical therapy. ... (05 Mar 2000) ...

physiotherapy
Synonym for physical therapy ... A physical therapist is a specialist trained using exercise and physical activities to condition muscles and improve level of activity. Physical therapy is helpful in those with physical debilitating illness (for example stroke). ... (27 Sep 1997) ...

physis
A term sometimes used in referring to the epiphysial cartilage. ... Origin: G. Growth ... (05 Mar 2000) ...

physo-
1. Tendency to swell or inflate. ... 2. Relation to air or gas. ... Origin: G. Physao, to inflate, distend ... (05 Mar 2000) ...

physocele
1. A circumscribed swelling due to the presence of gas. ... 2. A hernial sac distended with gas. ... Origin: physo-+ G. Kele, tumour, hernia ... (05 Mar 2000) ...

Physocephalus sexalatus
A small species of spiruroid nematodes (family Spiruridae) found in the stomach of pigs, horses, camels, rabbits, and hares; worldwide in distribution, and especially prevalent in hogs. ... Origin: G. Physa, bellows, + kephale, head ... (05 Mar 2000) ...

physocephaly
Swelling of the head resulting from introduction of air into the subcutaneous tissues. ... Origin: physo-+ G. Kephale, head ... (05 Mar 2000) ...

physometra
Distention of the uterine cavity with air or gas. ... Synonym: uterine tympanites. ... Origin: physo-+ G. Metra, uterus ... (05 Mar 2000) ...

Physopsis
A subgenus of the genus Bulinus, most species of which transmit the human blood fluke, Schistosoma haematobium, and some animal schistosomes in Africa south of the Sahara. ... Origin: G. Physis, growth, + opsis, aspect, appearance ... (05 Mar 2000) ...

physopyosalpinx
Pyosalpinx accompanied by a formation of gas in a fallopian tube. ... Origin: physo-+ G. Pyon, pus, + salpinx, trumpet ... (05 Mar 2000) ...

physostigma
The dried seed of Physostigma venenosum (family Leguminosae), a vine of western Africa; it contains the alkaloids physostigmine (eserine), eseramine, eseridine (geneserine) and physovenine; in toxic doses it causes vomiting, colic, salivation, diarrhoea, convulsions, sweating, dyspnea, vertigo, slow pulse, and extreme prostration. ... Synonym: Calab …

physostigmine salicylate
Used by conjunctival instillation to reduce tension in glaucoma, in the treatment of postoperative intestinal atony and urinary retention, in the management of myasthenia gravis, and to counteract excessive doses of tubocurarine; also available as physostigmine sulfate, with the same uses. ... Synonym: eserine salicylate. ... (05 Mar 2000) ...

phytanate
The anion of phytanic acid. ... Phytanate alpha-oxidase, An enzyme that oxidises phytanic acid, removing the carboxyl group. ... (05 Mar 2000) ...

phytanic acid
<chemical> 3,7,11,15-tetramethylhexadecanoic acid. A 20-carbon branched chain fatty acid. In phytanic acid storage disease (refsum disease) this lipid may comprise as much as 30% of the total fatty acids of the plasma. This is due to a phytanic acid alpha-hydroxylase deficiency. ... Chemical name: Hexadecanoic acid, 3,7,11,15-tetramethyl- ... ( …