(n.) An instrument or apparatus for measuring the intensity of an electric current, usually by the deflection of a magnetic needle.
Example Sentences:
(1) Three types of Berger's early investigations are described: (1) String-galvanometer recordings obtained between 1924 and 1926, mainly from trephined patients with cerebral diseases, which usually showed brain waves slowed to 6--8 per second; (2) Direct recordings from the cortex and white matter proving the cortical origin of the EEG in 1930; (3) Typical unpublished EEG recordings of epileptics and of petit-mal attacks obtained in 1930 and 1931.
(2) "Effective streaming currents" were determined by running the output through a low impedence galvanometer while simultaneously measuring the resistance of the circuit V(8) were, therefore, calculated from two measurements and compared.
(3) Films are presented for tracking on a translucent screen after reflection from a galvanometer driven mirror.
(4) Despite the universal use of the electrocardiogram for cardiac evaluation, surprisingly few physicians are aware of the individual, Willem Einthoven, who in 1901 reported and in 1924 received the Nobel Prize for the development of the string galvanometer electrocardiograph.
(5) He constructed the string galvanometer and thus he created an essential technical basis for the development of clinically applicable electrocardiographs.
(6) The results of heat measurements, using a sensitive thermopile-galvanometer system, are compatible with the hypotheses that this effect on relaxation could result from either an interference with calcium reuptake by the sarcoplasmic reticulum or an increased affinity of the troponintropomyosin complex for available calcium.
(7) When Einthoven developed the elegant, reliable and sensitive string galvanometer, he could record the electric forces of the heart from the hands and feet of the subject without even undressing him.
(8) The hook was soldered to the pivot of a galvanometer that was controlled by a waveform generator.
(9) Volta's doctrine prevailed over Galvani's school after Volta's breakthrough with his pile, or battery, until Galvani's ideas were rehabilitated by Nobili, who in 1828 measured the 'frog current' with his galvanometer.
(10) The scanning apparatus of our system, paired galvanometer mirrors, can perform narrow band scanning of an area of interest at a high temporal resolution of less than 70 msec per image.
(11) This report deals with a simplified and improved method for measuring the force-velocity relationship of the cat papillary muscle by means of a coil-type galvanometer and a horizontally oriented lever system.
(12) When Einthoven's great galvanometer became available, only the three standard limb leads were used.
(13) We have developed a new confocal laser scanning microscope equipped with two galvanometer mirrors which swing the laser beam.
(14) Electrocardiography only became clinically relevant in 1901 when Willem Einthoven devised his string galvanometer for this purpose.
(15) The present invention is based on the use of two ballistic galvanometers in connection with an ECG-Bcg set, making it unnecessary to change poles mechanically each time in order to take in surface values above and below the zero line.
(16) Two designs use servo-controlled DC motors configured as velocity servos and a third design uses a galvanometer motor configured as a position servo.
(17) The interest towards intraventricular conduction defects started some 10 yr after the introduction of the string galvanometer by Einthoven.
(18) The galvanometer-mirror assembly is mounted on an arm which can be rotated through 90 degrees.
(19) The indicated values of the ballistic galvanometer can, on the one hand, be read directLy or, on the other hand, be documented mechanically by means of a film camera or by a photographic camera with or without different adjustable time delays or by electronic coupling after applying the measurement(s).
(20) Raster scan of the beam is provided by two orthogonal mirror galvanometers.
Null
Definition:
(a.) Of no legal or binding force or validity; of no efficacy; invalid; void; nugatory; useless.
(n.) Something that has no force or meaning.
(n.) That which has no value; a cipher; zero.
(v. t.) To annul.
(n.) One of the beads in nulled work.
Example Sentences:
(1) Measurements of acetylcholine-induced single-channel conductance and null potentials at the amphibian motor end-plate in solutions containing Na, K, Li and Cs ions (Gage & Van Helden, 1979; J. Physiol.
(2) DR(+) cells, however, showed no change in percentage and a lesser drop in absolute numbers, suggesting an increase with advancing disease of DR(+), Ig(-) null cells, which may represent immature B cell precursors.
(3) In this report we describe an improvement upon the design by Stanton and Lightfoot for a simple photographic null method to determine the kVp of a diagnostic region x-ray source.
(4) At least two (Rh null and the McLeod type) are responsible for congenital hemolytic disorders.
(5) (2) Sequences of brightness steps of like polarity (either increments or decrements) elicit positive and negative motion-dependent response components when mimicking motion in the cell's preferred and null direction, respectively.
(6) The analysis also involved statistical tests of a modified null hypothesis, the generation of confidence intervals (CIs) and a meta-analysis.
(7) The null potential of both responses became more and less negative with a decrease and an increase, respectively, in the extracellular potassium concentration.
(8) The null mutation of algR was generated in a mucoid derivative of the standard genetic strain PAO responsive to different environmental factors.
(9) Endoneurial fluid pressure (EFP) was recorded by an active, servo-null pressure system after a glass micropipette was inserted into rat sciatic nerve undergoing wallerian degeneration.
(10) In thymo-deprived mice (nude mice and B mice) the percentage of null cells increases during the stage of regeneration, and B mice develop a large number of Ig +-bearing cells.
(11) Alkaline phosphatase activity was elevated in the lymphocytes from T-CLL, cord blood and tonsils and the blast cells from Null-ALL.
(12) Analysis of ldlA cells has identified three classes of mutant alleles at the ldlA locus: null alleles, alleles that code for normally processed receptors that cannot bind LDL, and alleles that code for abnormally processed receptors.
(13) Putative null sup-38 mutations cause maternal-effect lethality which is rescued by a wild-type copy of the locus in the zygote.
(14) Null cells of patients with hypoplastic anemia did not produce erythroid colonies under any culture conditions.
(15) Comparison of simulated versus actual inheritance data demonstrates that the so-called null structural alleles actually produce functional globins.--The genetic controls in Peromyscus may be analogous to those in primates.
(16) A null zone and associated sudden phase-reversal of RSA were observed in stratum lucidum of CA3.
(17) When the stimulus is placed at a position approximately 80 degrees dorsal to the eye axis, there is no response; this area is called the null region.
(18) Northern blot analysis showed that Adh-1 mRNA was synthesized at wild-type levels in immature seeds of the null mutant, but dropped to 25% in mature seeds.
(19) Two tumours were null cell adenomas with PIs less than 0.1 and 0.2%.
(20) Thus this methodology offers the potential to study naturally occurring ADH electromorphs and null alleles independent of enzymatic activity assays.