(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.
Impediment
Definition:
(n.) That which impedes or hinders progress, motion, activity, or effect.
(v. t.) To impede.
Example Sentences:
(1) Impediments to the necessary growth of this subspecialty for the needs of clinical practice and research are outlined and criteria for certification are reviewed.
(2) An understanding of the possible psychologic impediments to weight loss can promote improved therapeutic intervention for the obese patient.
(3) The results suggest that chronic sunlight exposure may be associated with an impediment to normal maturation of human dermal collagen resulting in tenuous amount of HHL.
(4) In order to achieve palatal closure with the least possible impediment to maxillary growth, the two-stage repair seems to be the best procedure in our hands.
(5) Causes of these impediments to maintaining nutritional status are discussed, and suggestions to overcome them are given.
(6) The data are consistent with the hypothesis that there is a sequential increasing impediment of the programmed cascade for downstream heavy chain constant region gene rearrangements.
(7) Lack of reproducibility is a severe impediment of both current conventional and kinetic methods in the prognosis of gliomas.
(8) These organizations can greatly reduce the logistic impediments to evaluating EMS care and initiating improvements.
(9) Changes in the evaluation protocol could preclude existing impediments to provision of information and patient autonomy; however, certain intrapsychic issues must be recognized as ongoing clinical realities to be addressed as the doctrine of informed consent continues to evolve.
(10) This survey shows that the use of nondiagnostic mammography is still less than optimal, and identifies impediments to screening that need to be addressed in cancer control planning efforts.
(11) The most frequently listed impediments included patients' advanced age or fragility, inadequate health insurance, and excess travel distance.
(12) Major issues identified include operational specificity, mislabelling of procedures, relative contributions of components in multi-faceted treatment packages, and impediments to systematic replication.
(13) The clinics of a single university hospital center were observed to determine a practical rationale for and impediments to implementing a medical care evaluation program.
(14) Accurate assessment and effective response is rendered difficult due to underrepresentation or denial by the patient and countertransference impediments to recognition and limit setting by the therapist.
(15) One impediment to such a study is the absence of any identified gene whose transcription is directly dependent on the receptor-hormone complex.
(16) But, according to Ruddick, the state council is a “gerrymander”, with factional leaders creating new “on-paper” branches that meet at most once a year in order to elect a delegate to state council and keep hold of “the numbers” – presenting Liberal reformers with exactly the same structural impediment to change as is faced by Labor.
(17) Conroy said the Minchin protocol was “merely an administrative policy adopted by the Department of Finance” which was “no impediment to a police investigation into Ms Bishop’s conduct”.
(18) A significant impediment in determining the relative contribution of whole blood viscosity to the pathogenesis of cardiovascular and cerebrovascular disease has been the lack of an uncomplicated method to measure whole blood viscosity.
(19) However, the lack of data on the forms of chromium-absorption from foods by the gastro-intestinal tract, and our concomitant inability to obtain an accurate assessment of the daily mobile pool of metabolically active chromium in the human body continues to be an impediment in assessing the overall impact of chromium nutrition.
(20) The results of this study indicated that the use of a nonresorbable hydroxylapatite for grafting resulted in impediment of tooth eruption and distortion of crown development.