Oxygen hood

Ribavirin may be considered for bronchiolitis caused by respiratory syncytial virus in a subset of patients (those with underlying pulmonary or cardiac disease or with severe acute infection). Use of the drug requires special equipment (small-particle aerosol generator) and specifically trained personnel for administration via oxygen hood or mist tent. 

Nonmechanically ventilated infants - The aerosol is delivered to an infant oxygen hood from the SPAG-2 aerosol generator. Administration by face mask or oxygen tent may be necessary if a hood cannot be used. However, the volume and condensation area are larger in a tent, and this may alter the drug s delivery dynamics. 

Ribavirin is teratogenic and embryotoxic in laboratory animals and should not be given to pregnant women. Concern has been expressed about the safety of people in the same room as patients being treated with ribavirin by aerosol, particularly women of child-bearing age. However, no ribavirin was detected in the urine, plasma, or erythrocytes of 19 nurses exposed to ribavirin administered via ventilator, oxygen tent, or oxygen hood over 3 days (22). 

OH Oxygen hood a clear plastic enclosure placed over a nonintubated infant to allow humidification of... 

Electric steel furnaces charging, pouring, oxygen blow Fumes, smoke, particulates (dust), CO Segregating dirty scrap proper hooding, baghouses or electrostatic precipitator... 

Open-hearth furnaces oxygen blow. Fumes, smoke, SO, particulates Proper hooding, settling chambers. 

On oxygen steel conversion furnaces, primary fume control is usually achieved by a separate close-capture hood positioned over the vessel mouth. The enclosure is then used for secondary fume control during charging, turndown, tapping, and slagging. 

Basic Oxygen Furnace Boilers (BOF Boilers) Basic oxygen furnace boilers are commonly employed in the BOF steel-making process. A WH boiler is fitted into the flue gas hood. The WH boiler may be either a steam generator of water-wall membrane construction or a steam-pressurized HTHW boiler. Where a steam generator is employed, the steam is fed to the plant for general use. 

With modem equipment it is now possible to measure oxygen consumption and carbon dioxide production breath by breath. Alternatively, for long-term studies, the volunteer can be enclosed in a room and the changes in content of the gases measured. For resting subjects and for patients, this is not necessary a simple hood over the head may be sufficient to allow measurement of oxygen uptake and carbon dioxide production, if precision is not required. 

The ISV process uses electricity to heat and melt soil and other earthen materials contaminated with organic, inorganic, and radioactive compounds. Organic compounds undergo pyrolysis (thermal decomposition in the absence of oxygen). The pyrolyzed compounds then migrate to the surface zone, where they are collected and oxidized in a collection hood. Inorganic and radioactive components are incorporated as oxides into a leach-resistant vitrified product. 

Caution. Tetrahydrofuran (THF) is extremely flammable and hygroscopic and forms explosive peroxides only anhydrous peroxide-free solvent should be used. Lithium wire is a hazardous substance and must be handled under strictly anaerobic conditions. Further, since it slowly reacts with dinitrogen at room temperature, lithium metal is best handled under an atmosphere of dry, oxygen-free argon. Vanadium trichloride is air-sensitive and should be transferred under an inert atmosphere. Carbon monoxide is a toxic and flammable gas and must be handled in a well-ventilated fume hood. 

In a hood, to a cooled solution of 0.344 gm (0.0024 mole) of W-nitroso-A-cyclohexylhydroxylamine in 3 ml of glacial acetic acid is added 1 drop of concentrated hydrochloric acid. While there is a strong evolution of gas (68 % nitrogen, 27% nitric oxide, and 5% oxygen), the solution, which initially was blue, finally becomes yellow. 

The reaction of fluorine with water, producing hypofluorous acid (HOF) and subsequently oxygen difluoride (OF2), has been the subject of intensive study over the last fifty years.1 Additionally, hypofluorous acid in acetonitrile has been characterized.5 The reagents are potentially explosive and present a toxicity hazard similar to fluorine therefore, work should be carried out in an efficient hood and proper safety equipment is required. It was established in the earliest investigations that the reaction of hypofluorous acid with alkenes in nonpolar solvents gives fluoro hydrins, e.g. 1, in high yield.6 However, it is now clear that epoxides are initially formed in acetonitrile7 and 1,2-epoxycyclohexane (2) is formed in reactions with cyclohexene in various solvents.5... 

Caution. All operations must be carried out under anhydrous oxygen-free conditions using standard Schlenk techniques. Tetramethyltin is toxic on inhalation and/or other contact and is also flammable. Dimethylsulfoxide is an irritant and can penetrate the skin very easily. Contact with the skin by either reactant should be avoided. It is necessary to carry out the reaction in a well-ventilated fume hood. 

A 0.056-g sample of AIBN (2,2 -azobisisobutyronitrile) is placed into a one-piece 100-mL flask (such as Chemglass AF-0522-02)t equipped with a Teflon vacuum stopcock and a magnetic stir bar, and the flask is evacuated at — 196°C. A 1.69-g (15.9 mmol) sample of B-vinylborazine (prepared by the procedure described above) is vacuum distilled into the flask. Three freeze-pump-thaw cycles are performed in order to remove any traces of oxygen. The stopcock is closed and the reaction flask is removed to a shielded hood where it is heated in an oil bath at 70°C for about 3 h, at which point the material is sufficiently viscous that the stir bar stops. Then 5 mL of benzene is condensed into the flask and the solution is heated at 70°C for another 9 h. Slow addition of the benzene solution into 40 mL of pentane under inert atmosphere affords the precipitation of 0.73 g (43.2% yield) of poly(B-vinyl-borazine). The polymer is filtered under nitrogen and dried in vacuo for about 5 min. 

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