Chelation of unbleached and oxygen bleached hardwood and softwood kraft pulps with EDTA was studied. The main focus was on the desorption of magnesium, manganese, and iron due to their impact in TCF-bleaching. Desorption of other metal ions present were also studied in order to get an over-all estimation of the metal ion concentrations and their desorption during chelation. By using the concept...

Internal friction and ultrasonic attenuation peaks associated with diffusionless phase transformations in alloys, such as thermoelastic martensites and others, were reviewed. They were discussed from the stand point of (1) Understanding the mechanism of the phase transformations and (2) Developing new alloy materials of high damping capacity for application to noise and vibration abatement. Pha...

The west-central Sinai area includes one of the most productive manganese deposits in Egypt (Um Bogma Mn-Fe ore). explored is covered by a Carboniferous and Cambro-Ordovician sedimentary succession overlying Precambrian basement rocks. purpose this study to delineate geochemical anomalies ore related elements track their dispersion trains, which may lead discovery unknown deposits. For purpose,...

We have studied the features of heavy metal accumulation in and have carried out a hygienic assessment of medicinal plants Taraxacum officinale Web. growing in various areas of the microrelief of the Kedrovskii coal mine rock dump. We have revealed a higher variability in the content of Cr, Mn, Zn and Fe mobile forms in the waste embryonic soils and have found that Cu and Zn content was lower t...

Characterizing labile metal distribution and biogeochemical behavior in sediments is crucial for understanding their contamination characteristics in lakes, for which in situ, high-resolution data is scare. The diffusive gradient in thin films (DGT) technique was used in-situ at five sites across Lake Taihu in the Yangtze River delta in China to characterize the distribution and mobility of eig...

Proteolytic studies of rat liver metallothionein reconstituted in vitro with Cu salts revealed that the 2 metal centers fill in an ordered fashion. The B cluster in the NH2-terminal beta domain fills prior to Cu binding in cluster A. This is in contradistinction to cluster formation induced by the binding of Cd or Zn ions in which cluster A is the center of initial binding. The formation of met...

Receptor fractions were prepared from follicle-rich ovaries (for FSH), luteal cell-rich ovaries (for LH and PRL), and adrenals (for PRL) of rats. Divalent metal ions, Mg++, Ca++, and Mn++ showed inhibitory effects on the binding of LH and FSH to their receptors. The binding of the former was more sensitive to these ions than the latter. On the other hand they showed bell-shaped promotive effect...

Stability of hydrogen peroxide in time was investigated in the presence of various metal ions and a complexing agent ethylenediaminetetraacetic acid (EDTA). Metal ions: Fe(III), Mn(II), Co(II), Cu(II), Ni(II), Zn(II) and Pb(II) were applied at different concentrations with a chelator in a concentration of 1 ·10 mol/dm, and the solutions were kept at 4C between the measurements. Obtained data in...

the concentrations of some heavy metals in sediment from the sinop coasts of the black sea were measured to monitor metal pollution in 2013. the distribution of the heavy metals in sediments of the black sea shows a variable pattern. the objectives of the present study were to elucidate the distribution heavy metals such as cu, pb, zn, ni, mn, fe, as, cd, cr, hg and co in sediment from sinop co...