| ECG | Electro-Cardio-Graphy(-Gram); ½ÉÀüµµ = EKG 1. Conducting System Structu... |
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| SFAP | single-fiber action potential |
| SFEMG | single fiber electromyography |
| SB | Bachelor of Science; Schwartz-Bartter [syndrome]; serum bilirubin; shortness of breath; sick bay; si... |
| SCA | self-care agency; severe congenital anomaly; sickle-cell anemia; single-camera autostereoscopic [ima... |
| SEVC | single electrode voltage clamp |
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| SFEMG | Single fiber EMG |
| SFEMG | Single fiber electromyography |
| CPE | carbon paste electrode |
| HMDE | Hanging Mercury Drop Electrode |
| active electrode | A small electrode whose exciting effect is used to stimulate or record potentials from a localised area. Synonym: exciting electrode, localizing electrode, therapeutic electrode. (05 Mar 2000) |
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| calomel electrode | An electrode in which the wire is connected through a pool of mercury to a paste of mercurous chloride (Hg2Cl2, calomel) in a potassium chloride solution covered by more potassium chloride solution; commonly used as a reference electrode. (05 Mar 2000) |
| carbon dioxide electrode | A glass electrode in a film of bicarbonate solution covered by a thin plastic membrane permeable to carbon dioxide but impermeable to water and electrolytes; the carbon dioxide pressure of a gas or liquid sample quickly equilibrates through the membrane and is measured in terms of the resulting pH of the bicarbonate solution, as sensed by the glass electrode; commonly used to analyze arterial blood samples. Synonym: Severinghaus electrode. (05 Mar 2000) |
| redox electrode | An electrode capable of measuring oxidation-reduction potential. See: quinhydrone electrode. Synonym: redox electrode. (05 Mar 2000) |
| reference electrode | An electrode expected to have a constant potential, such as a calomel electrode, and used with another electrode to complete an electrical circuit through a solution; e.g., when a reference electrode is used with a glass electrode for pH measurement, changes in voltage between the two electrode's can be attributed to the effects of pH on the glass electrode alone. (05 Mar 2000) |
| glass electrode | A thin-walled glass bulb containing a standard buffer solution, quinhydrone, and a platinum wire; when immersed in an unknown solution, a potential difference develops that varies with the pH of the unknown solution; this difference can be made to give the pH; used in pH meters. (05 Mar 2000) |
| central terminal electrode | In electrocardiography, an electrode in which connections from the three limbs (right arm, left arm, and left leg) are joined and led to the electrocardiograph to form the indifferent electrode, theoretically at zero potential for the system. (05 Mar 2000) |
| Clark electrode | An oxygen electrode consisting of the tip of a platinum wire exposed to a thin film of electrolyte covered by a plastic membrane permeable to oxygen but not to water or the electrolyte. When a certain voltage is applied, oxygen is destroyed at the platinum surface; the flow of current is then proportional to the rate at which oxygen can diffuse to the platinum surface from the gas or liquid sample outside the membrane, and is thus a measure of the oxygen pressure in the sample; commonly used to measure oxygen pressure in arterial blood samples. (05 Mar 2000) |
| polymorphism, single-stranded conformational | Variation occurring within a species in the conformation of denatured DNA fragments. These single-stranded DNA fragments are allowed to partially renature in a way that prevents the formation of double-stranded DNA. The fragments are run on polyacrylamide gels under various conditions to detect subtle changes in migration due to altered secondary structure. The resulting bands will align themselves if the fragments are the same, but will misalign if any point mutations are present. Sscps have been used in detecting mutations in various genes, such as oncogenes, tumour suppressor genes, and genes responsible for genetic diseases. (12 Dec 1998) |
| positive electrode | <microscopy> The electrode to which a major flow of electrons takes place internally (as in a cathode-ray tube) or to which an external positive voltage supply is connected. (05 Aug 1998) |
| Severinghaus electrode | A glass electrode in a film of bicarbonate solution covered by a thin plastic membrane permeable to carbon dioxide but impermeable to water and electrolytes; the carbon dioxide pressure of a gas or liquid sample quickly equilibrates through the membrane and is measured in terms of the resulting pH of the bicarbonate solution, as sensed by the glass electrode; commonly used to analyze arterial blood samples. Synonym: Severinghaus electrode. (05 Mar 2000) |
| hydrogen electrode | The ultimate standard of reference in all pH determinations, limited and technically difficult to use, consisting of a piece of spongy platinum black partly immersed in a solution in a small glass tube; the tube above the solution is filled with hydrogen gas that is bubbled through the solution and absorbed by the platinum; the electrode thus measures the potential between H2 and H+, the "standard" potential of which (1 atmosphere, 1 molar) is taken as zero; hence, the hydrogen electrode potential measures [H+] or pH. (05 Mar 2000) |
| silent electrode | In unipolar electrocardiography, a remote electrode placed either upon a single limb or connected with the central terminal and paired with an exploring electrode; the indifferent electrode is supposed to contribute little or nothing to the resulting record. Synonym: dispersing electrode, silent electrode. (05 Mar 2000) |
| single | 1. One only, as distinguished from more than one; consisting of one alone; individual; separate; as, a single star. "No single man is born with a right of controlling the opinions of all the rest." (Pope) 2. Alone; having no companion. "Who single hast maintained, Against revolted multitudes, the cause Of truth." (Milton) 3. Hence, unmarried; as, a single man or woman. "Grows, lives, and dies in single blessedness." (Shak) "Single chose to live, and shunned to wed." (Dryden) 4. Not doubled, twisted together, or combined with others; as, a single thread; a single strand of a rope. 5. Performed by one person, or one on each side; as, a single combat. "These shifts refuted, answer thy appellant, . . . Who now defles thee thrice ti single fight." (Milton) 6. Uncompounded; pure; unmixed. "Simple ideas are opposed to complex, and single to compound." (I. Watts) 7. Not deceitful or artful; honest; sincere. "I speak it with a single heart." (Shak) 8. Simple; not wise; weak; silly. "He utters such single matter in so infantly a voice." (Beau & Fl) Single ale, beer, or drink, small ale, etc, as contrasted with double ale, etc, which is stronger. Single bill, a single rope running through a fixed block. Origin: L. Singulus, a dim. From the root in simplex simple; cf. OE. & OF. Sengle, fr. L. Singulus. See Simple, and cf. Singular. 1. To select, as an individual person or thing, from among a number; to choose out from others; to separate. "Dogs who hereby can single out their master in the dark." (Bacon) "His blood! she faintly screamed her mind Still singling one from all mankind." (More) 2. To sequester; to withdraw; to retire. "An agent singling itself from consorts." (Hooker) 3. To take alone, or one by one. "Men . . . Commendable when they are singled." (Hooker) Origin: Singled; Singling. Source: Websters Dictionary (01 Mar 1998) |
| single ascertainment | Method of ascertainment of locating affected individuals by hospital or clinic admission or another way in which probability of encountering the same family twice approaches zero; thus, the probability that a family will be ascertained is proportional to the number of affected members. (05 Mar 2000) |
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