background : the aim of this study was to evaluate the performance of water ozonation on disinfection by-product formation. methods : experiments were carried out on samples taken from tajan river, mazandaran province, iran. samples of the pre-filtered raw water and from the 3.5-l water tank reservoir (wt) were analyzed for uv-254 absorbance, dissolved organic carbon (doc), hs and non-hs, chlor...

The evidence presented by Haas and Stack (1983) suggests that a parabolic relationship exists between a nation's level of industrialization and the strike activity among its labor force. Their model is tested using data from a different time period. Criticisms of the original model, including problems of heteroskedasticity, autocorrelation and multicollinearity, are addressed here. The findings...

Genetic divergence in the Snail Kite S. E. Haas t al. HORT COMMUNICATION Genetic divergence among Snail Kite subspecies: implications for the conservation of the endangered Florida Snail Kite Rostrhamus sociabilis S. E. HAAS, 1 R. T. KIMBALL, 1 J. MARTIN 2 & W. M. KITCHENS 2 * 1 Department of Zoology, University of Florida, PO Box 118525, Gainesville, Florida 32611, USA 2 Florida Cooperative Fi...

The classical Einstein-de Haas experiment demonstrates that a change of magnetization in a macroscopic magnetic object results in a mechanical rotation of this magnet. This experiment can therefore be considered as a macroscopic manifestation of the conservation of total angular momentum and energy of electronic spins. Since the conservation of angular momentum is a consequence of a system's ro...

THE nature of the cell wall constituents of the red and brown algae has been the subject of study in this laboratory for some time past [Haas and Hill, 1921; Haas, 1921; Russell-Wells, 1922; Haas and Russell-Wells, 1923, 1929]. The present investigation, which is concerned primarily with Laminaria spp., was undertaken with the object of throwing some light on the mode of occurrence within the p...

Hydroxy amino acids (HAAs) are of unique value in the chemical and pharmaceutical industry with antiviral, antifungal, antibacterial, anticancer properties. At present, hydroxylated most studied tryptophan, lysine, aspartic acid, leucine, proline, etc., some their derivatives. The hydroxylation is inextricably linked to catalysis various biological enzymes, such as tryptophan hydroxylase, L-pip...

The discovery of C-3 tethered 2-oxo-benzo[1,4]oxazines as potent antioxidants is disclosed. All the analogs 20a-20ab have been synthesized via "on water" ultrasound-assisted irradiation conditions in excellent yields (upto 98%). All the compounds have been evaluated for their in vitro antioxidant activities using DPPH free radical scavenging assay as well as FRAP assay. The result showed promis...

High concentration of NO (3) (-) in groundwater has raised concern over possible contamination of drinking water supplies. In addition, the formation of haloacetic acids (HAAs) as by-products during disinfection with chlorine-based agents is still a relevant issue, since HAAs pose serious health hazard. In this work, we investigated...