(n.) A colorless gaseous substance (O/) obtained (as by the silent discharge of electricity in oxygen) as an allotropic form of oxygen, containing three atoms in the molecule. It is a streng oxidizer, and probably exists in the air, though by he ordinary tests it is liable to be confused with certain other substances, as hydrogen dioxide, or certain oxides of nitrogen. It derives its name from its peculiar odor, which resembles that of weak chlorine.
Example Sentences:
(1) We studied the effect of a 2-hour exposure to 0.6 ppm of ozone on bronchial reactivity in 8 healthy, nonsmoking subjects by measuring the increase in airway resistance (Raw) produced by inhalation of histamine diphosphate aerosol (1.6 per cent, 10 breaths).
(2) Carbon monoxide accelerates the reaction as measured by nitric oxide oxidation or ozone formation.
(3) It is suggested that the atmosphere of Athens favours the formation of secondary direct-acting mutagens due to the oxidation and nitration of PAH by ozone and nitrogen oxides, which are more abundant in the late spring months.
(4) Therefore, more research of the effects of ozone on birds seems to be necessary, both from a mechanistic and an ecological point of view.
(5) Using this assay, we studied the effects of exposure to ozone (O3), hexachlorobenzene (HCB), and bis(tri-n-butyltin)oxide (TBTO) on NK activity in rat lung.
(6) The campaign’s focus was the damage to the ozone layer caused by fluorinated gases, such as HFCs.
(7) Particular attention was given to both the qualitative and quantitative evaluation of ciliated cells in the nasal respiratory epithelium in response to ozone exposure.
(8) Results indicate also that ozone sensitivity, radiosensitivity, and mucoidy are pleiotropic properties of the lon gene.
(9) Endothelial prostacyclin synthesis returned to baseline levels by 12H after ozone exposure, a time point which was similar to the recovery time of unexposed endothelium treated with 0.5 uM acetylsalicylic acid.
(10) After ozone-exposed mice had been returned to ambient air for 10 days, ciliary regeneration occurred and, the major airways had a surface appearance approaching the normal state.
(11) Pulmonary fibrosis is a consequence of severe injury from some toxic agents including high doses of ozone.
(12) In the first experiment, rats were fed fat-free diets and exposed to ozone for 0, 1, 2, and 4 weeks.
(13) A mathematical model of ozone absorption, or for any soluble gas that has similar transport properties, is developed for a branching network of liquid-lined cylinders.
(14) Serial exposures to peak levels of ozone on several consecutive days are more characteristic of pollution episodes in the Northeast United States and may be associated with recurrent symptoms.
(15) The enhancement of metastasis due to ozone exposure varied with length of exposure and concentration of ozone.
(16) The present data indicate that the incidence of skin cancer would increase by approximately 2% for each percent ozone reduction.
(17) And yet, trusting the science, and with international leadership, an agreement – the Montreal Protocol – was signed within two years of the discovery of a hole in the ozone layer in the southern polar region.
(18) Ozonized water placed in an open dish kept up antimicrobial activity for the first 20 minutes, but after 30 minutes this activity decreased substantially.
(19) However, single, 40-min exposures of RTE cells to approximately 10 ppm ozone did result in approximately 40% decreases in colony-forming efficiency.
(20) The present studies were undertaken to examine the effects of exposing asthmatics to ozone concentrations that occur in the environment.
Zone
Definition:
(n.) A girdle; a cincture.
(n.) One of the five great divisions of the earth, with respect to latitude and temperature.
(n.) The portion of the surface of a sphere included between two parallel planes; the portion of a surface of revolution included between two planes perpendicular to the axis.
(n.) A band or stripe extending around a body.
(n.) A band or area of growth encircling anything; as, a zone of evergreens on a mountain; the zone of animal or vegetable life in the ocean around an island or a continent; the Alpine zone, that part of mountains which is above the limit of tree growth.
(n.) A series of planes having mutually parallel intersections.
(n.) Circuit; circumference.
(v. t.) To girdle; to encircle.
Example Sentences:
(1) The most actively proliferating region of the excurrent duct system is zone 3 of the epididymis, whereas the least active region is the ductuli efferentes.
(2) There was a linear increase in the dimensions of these zones after the chewing.
(3) In hypophysectomized rats the activity of alanine aminotransferase was increased, but its normal zonation (predominance in the periportal zone) was preserved.
(4) The lesion (10.6 X 9.8 mm) was a well-defined ellipsoid granuloma due to a foreign body with a central zone of necrosis surrounded entirely by a fibrous wall.
(5) Anterior borderzone brachial paralysis (ABBP) is a hemodynamic ischemic syndrome of the watershed zone between the anterior and middle cerebral arteries.
(6) Employed method of observation gave quantitative information about the influence of odours on ratios of basic predeterminate activities, insect distribution pattern and their tendency to choose zones with an odour.
(7) In case of isolated damage of deep flexor tendon of the II-V fingers at the level of the I zone there were made palliative operations of 12 fingers: tenodesis and arthrodesis of distal interphalangeal articulation in functionally advantageous position.
(8) Good follow-up results in the zone 2, 3, 4 and 6 of VERDAN are observed only 6 to 17 percent (fig.
(9) The changes were apparent as hypofluorescent zones in the angiogram.
(10) The use of functional test with the ACTH administration demonstrated organic affection of the CNS to sharply aggravate the weakening and even the exhaustion of the functional reserves of the glomerular and the reticular zones of the adrenal cortex developing during thyrotoxicosis, and also the reserve possibilities of the sympathico-adrenal system.
(11) In the dark cortical zone of the nodes (III group) there occur tissue basophils (mast cells), that, together with increasing number of acidophilic granulocytes and appearance of neutrophilic cells, demonstrates that there is an inflammatory reaction in the organ studied as a response to the lymphocytic suspension injected.
(12) Results of detailed studies on tissue reactions to Cysticercus bovis in the heart of cattle, together with a comparison of findings in animals with spontaneous and experimental infection, and an evaluation of tissue reactions in relation to the location, morphology and morphogenesis of C. bovis provided evidence for the fact that in general, the response of the heart to the presence of C. bovis was an inflammatory reaction characterized by the origin of a pseudoepithelial border and a zone of granulation tissue.
(13) However, in the normal and border zones of the verapamil group the mitochondria are smaller when compared with the respective zones in the two other groups, but increases relatively more in size in the border and ischaemic zones.
(14) Refolding was observed by injection of denatured protein into columns having isocratic concentrations in the transition and native base-line zones.
(15) The distribution of cells at the stage of DNA synthesis and mitosis in all the parietal peritoneum speaks of the absence of special proliferation zones.
(16) Subcortical leukomalacia occurs in this triangle as well as in border zones between the major cerebral arteries.
(17) This contrasts sharply with the reduction in both the frequency and surface area of sensory neuron active zones that accompanies long-term habituation, and suggests that modulation of active zone number and size may be an anatomical correlate that lies in the long-term domain.
(18) Thus, multiparae had very thick border zones composed predominantly of large nodules and, additionally, of vacuolated cells and fibrous tissue.
(19) Acute transmural myocardial infarction has been reported to functionally denervate the normal myocardium distal to the infarcted zone by interrupting neurotransmission in axons coursing in the subepicardial region of the myocardial necrosis.
(20) In the modified test, shake cultures in Brewer's fluid thioglycolate medium with 0.3% agar added are observed for growth in the anaerobic zone of the tubes.