Multimetallic cooperativity is believed to play a key role in the cleavage of dinitrogen nitrides (N3-), but mechanism remains ambiguous due lack isolated intermediates. Herein, we report reduction complex [K2{[UV(OSi(OtBu)3)3]2(?-O)(?-?2:?2-N2)}], B, with KC8, yielding tetranuclear tetranitride cluster [K6{(OSi(OtBu)3)2UIV}3{(OSi(OtBu)3)2UVI}(?4-N)3(?3-N)(?3-O)2], 1, novel example N2 nitride b...

Ultraviolet (UV) exposure significantly contributes to non-melanoma skin cancer. In the context of health, UV is product time and Index (UVI), a weighted sum irradiance I(λ) over all wavelengths from λ = 250 400 nm. our analysis United States Environmental Protection Agency’s UV-Net database 400,000 spectral measurements taken several years, we found that UVI well estimated by 77 I310. To furth...

[1] Satellite-derived climatologies of UV index (UVI) and erythemal daily dose were determined for Argentina at a geographical resolution of 0.5 latitude by 0.5 longitude. Total Ozone Mapping Spectrometer climatology of key input parameters was used to calculate the clear-sky ground-level solar UV irradiance. NASA Surface meteorology and Solar Energy cloud cover data were used to determine the ...

abstract uranium is a radioactive heavy metal. development of nuclear industries and application of phosphate fertilizers contain uranium impurity resulted in soil contamination with uranium. a pot experiment had been conducted under controlled condition. the experiment carried out in completely randomized design with two factors, including two plants (soybean and sunflower) and six levels of u...

Biomass burning has an impact on atmospheric composition as well human health and wellbeing. In South Africa, the biomass season extends from July to October affects aerosol loading tropospheric ozone concentrations which in turn solar ultraviolet radiation (UVR) levels at surface. Using ground-based observations of aerosols, UVR (as modelled UVR) we investigated aerosols August, September, ove...

BACKGROUND The disparity in prevalence of infectious diseases across the globe is common knowledge. Vitamin D receptor (VDR)-mediated toll-like receptor (TLR) 2/1 signaling produces antimicrobial peptides, which is critical as a first line of defense in innate immunity. Numerous studies disclosed the independent role of genetic polymorphisms in this pathway, vitamin D status or season and more ...

  ABSTRACT   Background : Natural uranium exists in earth crust and seawater. The concentration of uranium might increase by human manipulation or geological changes. The aim of this study was to verify susceptibility of laser flourimetry method to determine the uranium concentration in Caspian Sea and Persian Gulf water.   Materials and Methods : Laser flourimetric method was used to determine...

background: measurement of back ground concentration of uranium in drinking water is very important for many reasons, specially, for human health. the uranium concentration in drinking water in many counties is a matter of concern for clinical and radioactive poisoning. materials and methods: the uranium concentration in drinking water is determined using laser flourimatric uranium analyzer. fo...