(n.) A carpentry obstruction, stockade, or other obstacle made in a passage in order to stop an enemy.
(n.) A fortress or fortified town, on the frontier of a country, commanding an avenue of approach.
(n.) A fence or railing to mark the limits of a place, or to keep back a crowd.
(n.) An any obstruction; anything which hinders approach or attack.
(n.) Any limit or boundary; a line of separation.
Example Sentences:
(1) Here we have asked whether protection from blood-borne antigens afforded by the blood-brain barrier is related to the lack of MHC expression.
(2) We conclude that chloramphenicol resistance encoded by Tn1696 is due to a permeability barrier and hypothesize that the gene from P. aeruginosa may share a common ancestral origin with these genes from other gram-negative organisms.
(3) The findings clearly reveal that only the Sertoli-Sertoli junctional site forms a restrictive barrier.
(4) This suggests that a physiological mechanism exists which can increase the barrier pressure to gastrooesophageal reflux during periods of active secretion of the stomach, as occurs in digestion.
(5) Comparison of the 50% binding concentrations of the compounds for the various PBPs of the five strains with their antibacterial activity indicates that the different antibiotics are excluded to a greater or lesser degree by the outer membrane permeability barrier and that the exclusion is most pronounced in P. aeruginosa.
(6) Preservation of dopaminergic and H1 neurotransmission, probably within the blood barrier, is needed to allow the neuroendocrine transduction of cholinergic inputs, whereas the role of 5-HT neurotransmission remains uncertain.
(7) Their levels in urine are a useful indicator of the integrity of membrane barriers of the kidney glomerular capillary wall.
(8) The IgG index (formula: see text) corrects for the influence of serum protein abnormalities as well as a bloodbrain barrier damage and is, therefore, a better measure for the presence of an IgG elevation in CSF due to IgG synthesis, when compared with other IgG quotients commonly used.
(9) In the far east is the arid, depressed country leading down Hell’s Canyon, which bottoms out at the Snake River, which the wolves crossed when they moved from Idaho, and which they now treat more as a crosswalk than a barrier.
(10) No signs of the blood-brain barrier disruption were observed.
(11) Although no anatomical 'barrier' has been described, it has been suggested that the gel mucus and epithelial phospholipids are constituents.
(12) Despite their wide dispersion, Vmax and the stereological determinations correlated strongly at 2 mo of age, confirming that Vmax is a robust indicator of the surface area of the air-blood barrier.
(13) Developmental changes are delineated, with particular reference to recent work on the ovine blood-brain barrier.
(14) Features of barrier island physiography and ecology were studied relative to selective bait deployment and site biosecurity.
(15) This study sought to determine if and why barriers to the over-the-counter purchase of syringes in the St. Louis metropolitan area might exist, given that no ordinance prohibits such a sale there.
(16) It is suggested that the intercalated disc functioned as a barrier to the freezing process.
(17) To explain some of these results a theoretical model is presented to demonstrate that while short circuiting can block the passive ionic movement, it will cause an increase in the energy consumption of the system and introduce certain important changes in the ionic barriers and e.m.fs.
(18) Our results show that paramagnetic enhancement with T1-weighted imaging adds specificity and enables rapid assessment of abnormalities of the blood-brain barrier.
(19) A functional impairment of the amino acid transport systems at the level of the blood-brain barrier seems to play a crucial role in causing deleterious modifications of the synaptic neurotransmission in the central nervous system.
(20) There was a significant correlation between the lesion index and the PD reduction, although the integrity of the resting gastric mucosal barrier remained unaltered.
Break
Definition:
(v. i.) To fall in business; to become bankrupt.
(v. t.) To strain apart; to sever by fracture; to divide with violence; as, to break a rope or chain; to break a seal; to break an axle; to break rocks or coal; to break a lock.
(v. t.) To lay open as by breaking; to divide; as, to break a package of goods.
(v. t.) To lay open, as a purpose; to disclose, divulge, or communicate.
(v. t.) To infringe or violate, as an obligation, law, or promise.
(v. t.) To interrupt; to destroy the continuity of; to dissolve or terminate; as, to break silence; to break one's sleep; to break one's journey.
(v. t.) To destroy the completeness of; to remove a part from; as, to break a set.
(v. t.) To destroy the arrangement of; to throw into disorder; to pierce; as, the cavalry were not able to break the British squares.
(v. t.) To shatter to pieces; to reduce to fragments.
(v. t.) To exchange for other money or currency of smaller denomination; as, to break a five dollar bill.
(v. t.) To destroy the strength, firmness, or consistency of; as, to break flax.
(v. t.) To weaken or impair, as health, spirit, or mind.
(v. t.) To diminish the force of; to lessen the shock of, as a fall or blow.
(v. t.) To impart, as news or information; to broach; -- with to, and often with a modified word implying some reserve; as, to break the news gently to the widow; to break a purpose cautiously to a friend.
(v. t.) To tame; to reduce to subjection; to make tractable; to discipline; as, to break a horse to the harness or saddle.
(v. t.) To destroy the financial credit of; to make bankrupt; to ruin.
(v. t.) To destroy the official character and standing of; to cashier; to dismiss.
(v. i.) To come apart or divide into two or more pieces, usually with suddenness and violence; to part; to burst asunder.
(v. i.) To open spontaneously, or by pressure from within, as a bubble, a tumor, a seed vessel, a bag.
(v. i.) To burst forth; to make its way; to come to view; to appear; to dawn.
(v. i.) To burst forth violently, as a storm.
(v. i.) To open up; to be scattered; to be dissipated; as, the clouds are breaking.
(v. i.) To become weakened in constitution or faculties; to lose health or strength.
(v. i.) To be crushed, or overwhelmed with sorrow or grief; as, my heart is breaking.
(v. i.) To make an abrupt or sudden change; to change the gait; as, to break into a run or gallop.
(v. i.) To fail in musical quality; as, a singer's voice breaks when it is strained beyond its compass and a tone or note is not completed, but degenerates into an unmusical sound instead. Also, to change in tone, as a boy's voice at puberty.
(v. i.) To fall out; to terminate friendship.
(v. t.) An opening made by fracture or disruption.
(v. t.) An interruption of continuity; change of direction; as, a break in a wall; a break in the deck of a ship.
(v. t.) A projection or recess from the face of a building.
(v. t.) An opening or displacement in the circuit, interrupting the electrical current.
(v. t.) An interruption; a pause; as, a break in friendship; a break in the conversation.
(v. t.) An interruption in continuity in writing or printing, as where there is an omission, an unfilled line, etc.
(v. t.) The first appearing, as of light in the morning; the dawn; as, the break of day; the break of dawn.
(v. t.) A large four-wheeled carriage, having a straight body and calash top, with the driver's seat in front and the footman's behind.
(v. t.) A device for checking motion, or for measuring friction. See Brake, n. 9 & 10.
(n.) See Commutator.
Example Sentences:
(1) Lucy and Ed will combine coverage of hard and breaking news with a commitment to investigative journalism, which their track record so clearly demonstrates”.
(2) They spend about 4.3 minutes of each working hour on a smoking break, the study shows.
(3) The mechanism by which pertussis toxin (PT) breaks the unresponsiveness of delayed-type hypersensitivity (DTH) to sheep red blood cells (SRBC) was examined in B10 mice.
(4) After absorption of labeled glucose, two pools of trehalose are found in dormant spores, one of which is extractable without breaking the spores, and the other, only after the spores are disintegrated.
(5) The following possible explanations were discussed: a) the tested psychotropic drugs block prostaglandin receptors in the stomach; b) the test substances react with prostaglandin in the nutritive solution; c) the substances stimulate metabolic processes in the stomach wall that break down prostaglandin.
(6) The ability of ligand to stimulate its own synthesis and that of its receptor suggests the presence of an autocrine positive feedback loop, however we were unable to break this loop in the breast cancer cells by antibodies that blocked the interaction of TGF alpha with the EGF receptor.
(7) Neutral sucrose density sedimentation patterns indicate that neutron-induced double strand-breaks sometimes occur in clusters of more than 100 in the same phage and that the effeciency with which double strand-breaks form is about 50 times that of gamma-induced double strand-breaks.
(8) Possible explanations of the clinical gains include 1) psychological encouragement, 2) improvements of mechanical efficiency, 3) restoration of cardiovascular fitness, thus breaking a vicous circle of dyspnoea, inactivity and worsening dyspnoea, 4) strengthening of the body musculature, thus reducing the proportion of anaerobic work, 5) biochemical adaptations reducing glycolysis in the active tissues, and 6) indirect responses to such factors as group support, with advice on smoking habits, breathing patterns and bronchial hygiene.
(9) At high luminances, the temporal, but not spatial, properties of this mechanism break down in a manner which had not been studied.Low-frequency inhibitory processThis process is manifest as a decrease in sensitivity from that of the simple excitatory process.
(10) These experiments represent the first occasion that the sequence specificity of a DNA damaging agent, which causes only double-strand breaks, has been determined to the exact base-pair in intact cells.
(11) The OPL first appears as a thin, discontinuous break in the cytoblast layer that is frequently interrupted by the profiles of migrating neuro- and glioblasts.
(12) Celebrity woodlanders Tax breaks and tree-hugging already draw the wealthy and well-known to buy British forests.
(13) But we need politicians to break out of historical routines.
(14) For Burroughs, who had been publishing ground-breaking books for 20 years without much appreciable financial return, it was association with fame and the music industry, as well as the possible benefits: a wider readership, film hook-ups and more money.
(15) Once you've invested many years in a career, figuring out how to take time out and then return to a role that's comparable to the one you left (or as comparable as you want it to be) requires more than confidence and enthusiasm - employers need to actively acknowledge the benefits of such breaks and be more receptive to those seeking to return”.
(16) A dose-dependent increase in chromatid lesions, i.e., achromatic lesions, chromatid breaks, chromatid deletions and triradial or quandriradial chromosomal exchange fiqures, was found.
(17) From the stress-strain curve the following values were selected: strain, stress, and slope at 80 mmHg equivalent pressure (1 mmHg = 133.3 Pa); maximum stress, strain, and slope; and breaking stress, strain, and slope if the sample broke.
(18) Everyone worked hard, but it is fair to pick out Willian because of his work-rate, quality on the ball, participation in the first goal and quality of the second.” It had been Willian’s fizzed cross, 11 minutes before the break, which Dragovic had nodded inadvertently inside Shovkovskiy’s near post to earn the hosts their initial lead.
(19) The possibility that mammalian DNA topoisomerase II is an intracellular target which mediates drug-induced DNA breaks is supported by the following studies using 4'-(9-acridinylamino)methane-sulfon-m-anisidide (m-AMSA): (a) a single m-AMSA-dependent DNA cleavage activity copurified with calf thymus DNA topoisomerase II activity at all chromatographic steps of the enzyme purification; (b) m-AMSA-induced DNA cleavage by this purified activity resulted in the covalent attachment of protein to the 5'-ends of the DNA via a tyrosyl phosphate bond.
(20) The authorities had said they used water cannon, teargas and smoke grenades to break up the protest.