(a.) Winding or circling round a center or pole and gradually receding from it; as, the spiral curve of a watch spring.
(a.) Winding round a cylinder or imaginary axis, and at the same time rising or advancing forward; winding like the thread of a screw; helical.
(a.) Of or pertaining to a spiral; like a spiral.
(a.) A plane curve, not reentrant, described by a point, called the generatrix, moving along a straight line according to a mathematical law, while the line is revolving about a fixed point called the pole. Cf. Helix.
(a.) Anything which has a spiral form, as a spiral shell.
Example Sentences:
(1) Digestion is initiated in the gastric region by secretion of acid and pepsin; however, diversity of digestive enzymes is highest in the post-gastric alimentary canal with the greatest proteolytic activity in the spiral valve.
(2) Don't we by chance come across this reciprocal spiral perspective when two people distrust one another without actually showing it?
(3) A great deal of information about the spiral bacteria of the stomach has accumulated in the past 5 years.
(4) Somalia has faced drought; famine; decades of conflict, now involving the Islamist rebels of al-Shabaab among other groups; the absence of an effective, central authority; and spiralling food prices.
(5) Spiral neurons, their fibers and endings as well as inner and outer hair cells express NSE in the isolated organ of Corti in culture.
(6) The binding sites were mainly located on the stereocilia, the cuticular plate of hair cells, the head plates of Deiters' cells, fibrous structures in pillar cells, in the spiral limbus and tectorial membrane and basilar membrane, plasma membranes, mitochondria and the chromatin of various kinds of cells.
(7) When normalized with respect to scala cross-section, the process of tracer movement across the spiral ligament is similar in the basal and third turns.
(8) Tangent-screen studies uncovered neurasthenic spiral fields superimposed on hysterical tubular contractions of both eyes.
(9) The phi-model also gives the noble numbers and moreover orders them in a way that establishes connections with the morphogenetic principles used in models for pattern generation; the order has to do with the relative frequencies of the spiral patterns in nature.
(10) The row had been inflamed over the weekend by a series of leaks about the spiralling price of Gove's free schools and high costs of Clegg's free school meals, giving Labour ammunition to attack the government's education policy in Westminster.
(11) Spiral-like primary dendrites were found and the orientation of secondary dendrites changed.
(12) The main uterine, radial and spiral arteries were identified in all patients.
(13) In animals receiving passive (unstimulated) implants, morphometric analysis of spiral ganglion cell density showed no significant difference in ganglion cell survival between the implanted cochleas and the contralateral control ears.
(14) Later, these vacuoles were divided into numerous vesicular spiral formation-centers, producing micronemes at the apical pole of young merozoites.
(15) During more extended exposure (60 and 90 days) the changes in hair cells of the spiral organ, which included nuclear deformation and disintegration of chromatin, mitochondria and endoplasmic reticulum membranes, became irreversible and caused the decay of injured cells.
(16) The company's value lies in its FM licence for London, with the audience for its national AM licence spiralling downwards in recent years.
(17) The spiral reinforcement at the same time prevents compression of the vein by surrounding cicatricial tissue as well as an aneurysmatic extension of the transplant.
(18) The intensity-measuring device in both apparatuses has a mobile disk attached to a motionless axis by a spiral spring; the clamps have fixing screws in the butts of a spong.
(19) The balance is fragile and the threat of a spiral of decline is not an idle one.
(20) They ran in a spiral pattern in the distal part of the middle cerebral artery.
Spirillum
Definition:
(n.) A genus of common motile microorganisms (Spirobacteria) having the form of spiral-shaped filaments. One species is said to be the cause of relapsing fever.
Example Sentences:
(1) The implications of the power calculations for the Berg & Anderson (1973) rotating shaft model are discussed and it is shown that a rotational resistive theory analysis predicts a 5-cross bridge M ring for each flagellum of Spirillum.
(2) and a Spirillum sp., were grown in continuous culture under steady-state conditions in L-lactate-, succinate-, ammonium- or phosphate-limited media.
(3) Spirillum-like MO sometimes penetrate into the parietal cells.
(4) Many of the isolates could not be identified, but the largest single group belonged to the genus Spirillum; other isolates were placed in the genera Leucothrix, Flavobacterium, Cytophaga, and Vibrio.
(5) A freshwater Spirillum sp., which apparently belongs to a niche of low nutritional status (Matin & Veldkamp, 1978), accumulated poly-beta-hydroxybutyric acid (PHB) during lactate-limited growth in continuous culture.
(6) The addition of nitrate to cultures of Spirillum itersonii incubated under low aeration produced a diauxic growth pattern in which the second exponential phase was preceded by the appearance of nitrite in the medium.
(7) Lower rates of C2H2 reduction were associated with control corn cultures which had been treated with autoclaved Spirillum than with cultures inoculated with live Spirillum.
(8) Aquaspirillum (Spirillum) gracile is one of the few spirilla that cause acidification of the medium when cultured with sugars.
(9) The other factors which appear to be involved include a lower energy of maintenance of Spirillum sp.
(10) It is proposed that this bacterium is the human gastric spirillum that in most persons lives in harmony with its natural host, resulting in asymptomatic infection.
(11) The methodology for deoxyribonucleic acid-mediated transformation of Spirillum lipoferum to resistance to various antimicrobial agents is reported.
(12) A mathematical model employing slender body theory is constructed for a unipolar Spirillum volutans cell with the model cell allowed to move unconstrainedly in the fluid.
(13) Very few spiral bacteria, including those of the spirillum type, were seen in the lumen of the large intestine.
(14) The lowest viscosity that immobilized flagellated bacteria such as Psedomonas aeruginosa, Spirillum serpens, and Escherichia coli was 60 centipoise (cp).
(15) This wrinkling effect is believed (on circumstantial evidence) to be caused by the bdellovibrio's disruption of the cell wall lipoprotein of the Spirillum.
(16) The gastric spirillum Helicobacter felis, originally isolated from the cat stomach, colonizes the stomachs of germfree rats.
(17) Sorghum and corn breeding lines were grown in soil in field and greenhouse experiments with and without an inoculum of N2-fixing in Spirillum strains from Brazil.
(18) In Spirillum sp., resistance correlated directly with the PHB content of the culture subjected to starvation, whereas in Pseudomonas sp.
(19) A complex and easily disrupted arrangement of macromolecules was present on the outer (lipopolysaccharide) membrane of the cell wall of Spirillum metamorphum.
(20) That the peptidoglycan backbone remains essentially intact, even after the Spirillum cell has been entered by the Bdellovibrio, is supported by the observation that the soluble amino sugar content of the culture medium, as determined by chemical analysis, does not rise even 5.0 h after the association of the Bdellovibrio with the Spirillum has begun.