Description colorless liquid Molecular formula C2Cl4 Molecular weight 165.83 Density 1.6227 g/cm @ 20°C Boiling point 121°C Melting point -19°C Vapor pressure 18.47 mm Hg @ 25°C Flashpoint unknown Explosive limits unknown Solubility soluble in alcohol, ether, chloroform, benzene and hexane; practically insoluble in water Odor threshold 47 ppm (geometric mean) (AIHA, 1989) Odor description color...

Laboratory design of an ozone concentration regulator which is build on the theory of continuity equation for gas flow in parallel pipes in conjunction with the ozone elimination potentials of an ozone destructor is presented. At an initial oxygen flow rate of 33.33 cms, ozone concentration was generated and varied between 429.30 parts per million (ppm) to 3826.60 ppm. Similarly at an initial o...

This article reports on the bioactivities of citrus extracts (citrus extract, lemon extract, and neroli) toward Saccharomyces cerevisiae, Zygosaccharomyces bailii, Zygosaccharomyces rouxii, Pichia membranifaciens, and Rhodotorula bacarum. The bioactivities of the extracts (from 10 to 100 ppm) were evaluated through a microdilution method; thereafter, citrus extracts (0 to 80 ppm) were tested in...

Description colorless liquid Molecular formula C2Cl4 Molecular weight 165.83 Density 1.6227 g/cm @ 20°C Boiling point 121°C Melting point -19°C Vapor pressure 18.47 mm Hg @ 25°C Flashpoint unknown Explosive limits unknown Solubility soluble in alcohol, ether, chloroform, benzene and hexane; practically insoluble in water Odor threshold 47 ppm (geometric mean) (AIHA, 1989) Odor description color...

BACKGROUND Surfaces in congregate settings, such as vehicles used for mass transportation, can become contaminated with infectious microorganisms and facilitate disease transmission. We disinfected surfaces contaminated with H1N1 influenza viruses using hydrogen peroxide (HP) vapor at concentrations below 100 ppm and triethylene glycol (TEG)-saturated air containing 2 ppm of TEG at 25 degrees C...

Timed-pregnant Fischer 344 rats and New Zealand White rabbits were exposed to ethylene glycol monobutyl ether vapors by inhalation on gestational days 6 through 15 (rats) or 6 through 18 (rabbits) at concentrations of 0, 25, 50, 100 or 200 ppm. The animals were sacrificed on gestational day 21 (rats) or 29 (rabbits). In rats, exposure to 200 or 100 ppm resulted in maternal toxicity (clinical si...

Zinc (Zn) is one of the essential micronutrients required for optimum plant growth. Substantial quantity of applied inorganic zinc in soil is converted into unavailable form. Zinc solubilising bacteria are potential alternates for zinc supplement. Among 10 strains screened for Zn solubilisation, P29, P33, and B40 produced 22.0 mm clear haloes on solid medium amended with ZnCO3. Similarly, P17 a...

Description colorless gas Molecular formula CH2O Molecular weight 30.03 Density 0.815 g/L @ -20°C Boiling point -19.5°C Melting point -92°C Vapor pressure 3883 mm Hg @ 25°C (Howard, 1989) Flashpoint 300° C or 573°F Explosive limits upper = 73% lower = 7% Solubility soluble in water, alcohol, ether, other polar solvents Odor threshold 0.05-0.5 ppm Odor description very pungent odor; straw-like M...

A b s t r a e ~ A r o c l o r 1242, a commercial polychlorinated biphenyl mixture, was fed to rats at dietary levels of 0, 5 and 25 ppm for 2, 4 and 6 months. Significant elevations of urinary coproporphyrin excretion, hepatic lipid and hepatic microsomal-hydroxylase activity were observed in rats ingesting 25 ppm for 2 months. In rats given the 5 or 25 ppm regimens for 4 or 6 months, urinary c...

The effect of dietary thyme-oil extract (TOE) supplementation on immune functions of broilers were assessed by feeding graded levels (50, 100, 200, or 400 ppm) of TOE to male broiler chicks during a 42-d feeding trial compared with negative- or positive-control diets. Dietary control treatments included a negative-control diet with no feed-additive supplementation and 2 positive-control groups ...