(n.) The Greek letter /, /, or / (English S, or s). It originally had the form of the English C.
Example Sentences:
(1) The programs are written in Fortran and are implemented on a Rank Xerox Sigma 6 computer.
(2) The use of sigma 54 promoters, known to require cognate binding proteins, could allow the fine-tuning that provides the temporal ordering of flagellar gene transcription.
(3) It is concluded that the marked effects of certain sigma ligands on DA cell electrophysiology are likely due to their non-sigma properties.
(4) The common effects of sigma agonist compounds on LCGU included a moderate, global elevation of LCGU.
(5) To test the hypothesis that EAA agonists are involved in transmission of nociceptive information in the spinal cord, we tested the effect of various opioid, sigma and phencyclidine compounds on the action of NMDA in the tail-flick, hot-plate and biting and scratching nociceptive tests.
(6) The instrumental treatment of the volvulus of the sigma prevents surgical interventions under unfavourable conditions for the patient.
(7) All are satisfied by [Formula: see text], where N is the size of rod signal, constant for threshold; theta, theta(D) are steady backgrounds of light and receptor noise; varphi is the threshold flash with sigma a constant of about 2.5 log td sec; B the fraction of pigment in the bleached state.
(8) The amino acid composition of purified sigma 28 protein and the amino acid sequences of tryptic peptide fragments have been determined.
(9) Together, these findings suggest that sigma agents may have cerebroprotective effects.
(10) Left ventricular cavity and muscle areas of each image were planimetered with a light-pen system and summated for volume: total volume = sigma (areas x 3 mm).
(11) It also suggests that the -10 and its downstream regions are more important than the -35 region for the formation of the E sigma A-P2 promoter open complex.
(12) We also observed a significant correlation between the Ki values for sigma compounds to inhibit [3H]pirenzepine binding and their IC50 values to inhibit carbachol-stimulated phosphoinositide turnover.
(13) Vascular permeability was evaluated by use of the fluid filtration coefficient (Kf) and the osmotic reflection coefficient for total proteins (sigma, hematocrit-protein double indicator technique), and pulmonary capillary pressure (Pc) was estimated by the double occlusion technique.
(14) Sigma is a surface area-independent indicator of microvascular permeability when determined for specific protein molecules at high transmicrovascular fluid fluxes.
(15) A method is described for the rapid purification of DNA-dependent RNA polymerase sigma-70 holoenzyme from Escherichia coli.
(16) For each investigated case, the post-operative temporal average of sigma S was calculated (sigma S) and a value of 1.25 was used as discriminating threshold.
(17) To determine the relationship between SVR and sigma es, left ventricular afterload and contractility were pharmacologically altered in eight dogs instrumented with central aortic microtip and Swan-Ganz thermodilution catheters.
(18) The standard derivation, sigma 10 of analysis of water samples was 1.08-1.23% while for blood plasma sigma 6 = 2.02-2.62%.
(19) The mechanical properties of compressed beam specimens of microcrystalline cellulose (Avicel pH 101) have been assessed in terms of the tensile strength (sigma t), Young's modulus (E) and the following fracture mechanics parameters: the critical stress intensity factor (KIC), the critical strain energy release rate (GIC) and the fracture toughness (R).
(20) In Escherichia coli the genes encoding ribosomal protein S21 (rpsU), DNA primase (dnaG), and the 70-kDal sigma subunit of RNA polymerase (rpoD) are contained in a single operon.
Summation
Definition:
(v. t.) The act of summing, or forming a sum, or total amount; also, an aggregate.
Example Sentences:
(1) Alphaxalone and endogenous steroid hormone metabolites inhibit the binding of [35S]-t-butyl bicyclophosphorothionate in some regions, enhance it in others and give biphasic concentration-dependence in others, apparently the result of algebraic summation of two effects involving regional-dependent enhancement or inhibition.
(2) This suggests that the curvature of the xenon clearance curve is the result of recording the summation of the activities from the alveoli and the pulmonary blood and not, as previously described, due to the existence of two different sub-populations of alveoli.
(3) Left ventricular cavity and muscle areas of each image were planimetered with a light-pen system and summated for volume: total volume = sigma (areas x 3 mm).
(4) The computer system was a hybrid of analog devices (tape-recorder, voltage summator, and high-pass filters) and a multipurpose laboratory digital device (PDP-12).
(5) Spatial summation was found to decrease by 30-50% as the cell was light-adapted to a threshold some 4 log units above the dark-adapted one.
(6) The findings strongly suggest the existence of spatial summation of the effects from GM and TA muscle at the level of a single interneuronal pool.
(7) The parameters mainly related to temporal summation are not different between various electrode configurations.
(8) Therefore, anopic observers usually need a very large amount of spatial summation to arrive at a well defined match of the projection anomaloscope.
(9) This model corresponds to quadratic summation of the stimulus followed by a random threshold device.
(10) Consequently, the slow repolarization transients of succeeding receptor potentials displayed temporal summation.
(11) Thus the relation of neuron geometry to aspects of spatiotemporal summation of synaptic inputs can be investigated readily.
(12) The summation of findings suggests that endogenous substance P plays a complementary role in the regulation of parasympathetic nerve-induced fluid secretion in the acinus but is minimally involved in degranulation from granular duct cells.
(13) These estimates can be summated to provide total ventricular and total brain volumes.
(14) This effect of parathyroid hormone, which appears to involve more than simple physiologic summation, may have important clinical implications.
(15) At frequencies above 15 Hz the SETi-evoked contraction dominates tension development, though IR summates with it during the rising phase.
(16) At reoperation because of dehiscence and hematoma interval between two operation is very short so we have got present not only hypovolemia but also summation effect of used anesthetic and plasma expander.
(17) The stimulant effects of amantadine and d-amphetamine summated but did not interact, response rates after d-amphetamine being augmented by pretreatment with amantadine except at intervals at which amantadine was by itself depressant.
(18) The laminar pattern of current sources and sinks coincident with this component was more complicated after bicuculline, reflecting the summation of current flows associated with disinhibited lamina 4 activity.
(19) The cochlear summating potential (SP) preceding the auditory nerve compound action potential (AP) was elicited by broadband alternating condensation and rarefaction clicks and recorded by noninvasive electrodes from the external auditory meatus (EAM) of 60 volunteers of both sexes, 12 to 67 years old, who had normal hearing for age.
(20) It is wiser, in the light of results reporting individual differences in the existence and extent of the paradox, and its sensitivity to stimulus conditions, to side with Blake and Fox (1973) when they observed that it is not unreasonable to suppose that various stimulus conditions might yield varying amounts of summation or even inhibition.