(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.
Harrier
Definition:
(n.) One of a small breed of hounds, used for hunting hares.
(n.) One who harries.
(n.) One of several species of hawks or buzzards of the genus Circus which fly low and harry small animals or birds, -- as the European marsh harrier (Circus aerunginosus), and the hen harrier (C. cyaneus).
Example Sentences:
(1) Unlike most birds of prey, which are territorial and fight each other over nesting and hunting grounds, the hen harrier nests close to other harriers.
(2) For the first time in 30 years, and possibly longer, fresh water from deep underground is not filling the ditches and reedbeds of the 40-hectare reserve known for its bitterns, water voles and marsh harriers.
(3) She suggested that hen harriers could be easily scared off.
(4) Even when we had 14 pairs here, the RSPB still wanted more, instead of dispelling the myth that the harrier could take gamekeepers’ livelihoods away.” Grouse moorland is “the best and the worst place for the hen harrier,” added Murphy.
(5) Ward Sr described the decision to retire the Harrier as "absolutely appalling" and said his son had been absolutely right to speak out.
(6) Adults £11, six-15 years £7.60 Royal Air Force Museum, Barnet, London History lessons come to life at this museum in north London, which houses over 100 aircraft including Harriers, Chinooks, Tiger Moths and an F-35 Joint Strike Fighter jet.
(7) Some birds of prey also thrived on grouse moors because of these plentiful food supplies: merlin were four times more numerous on grouse moors than in other locations (although this may be because, unlike hen harriers, they are too small to kill grouse).
(8) Sir Mark Stanhope, the head of the navy, told the committee that the aircraft carrier Ark Royal and its jumpjet Harriers would have been used to bomb Libya had they not been axed.
(9) It's the last place on Earth you would want to be with feathers.” His films show him breaking down on several occasions, particularly when he visited a Maltese vet and sees a Montague's harrier, which has to be put down after it was illegally shot.
(10) If the Harriers do fall victim to the Tornados, there may be no suitable aircraft available to fly from the first carrier, the Queen Elizabeth, which is due to enter service in 2016.
(11) We let the owners of grouse moors , 1% of the 1%, shoot and poison hen harriers, peregrines and eagles.
(12) Even when a naturalist working for the government witnessed two hen harriers being shot out of the sky seven years ago, the Crown Prosecution Service brought no charges.
(13) It's a glass case filled with pictures of aircraft cut haphazardly from newspapers, each one meticulously labelled like an animal specimen: Hawk, Harrier, Bear, Chinook.
(14) Since 2000, 20 gamekeepers have been found guilty of “raptor persecution” or poisoning offences on grouse moorland, including one who killed a hen harrier in Scotland.
(15) • The government to retire the Harrier jump jet and reduce RAF manpower by 5,000 to 33,000 by 2015.
(16) Not because these powerful birds of prey represented a danger to wildlife, but because the harriers themselves are under threat.
(17) I have listened to all the military advice, and the military advice is pretty clear that when we have to make difficult decisions, it is right to keep the Typhoon as our principal ground attack aircraft, working in Afghanistan at the moment, and it is right to retire the Harrier."
(18) The keeper sees the harrier now as not just the thing that can eat their grouse but can upset their day-to-day life.
(19) Despite the performance of the Harrier jump jets, the landing was made without air superiority.
(20) Moorland owners, Anderson explained to me, wanted to be allowed to move hen harrier nests.