Four soil profiles located near a copper smelter in Poland were investigated for the distribution and chemical fractions of Cu, Pb, and Zn and their mobility in relation to soil properties. Contamination with heavy metals was primarily restricted to surface horizons and the extent of contamination was 7- to 115-fold for Cu, 30-fold for Pb, and 6-fold for Zn as compared with subsurface horizons....

potassium (k) is an element essential for plant growth, playing a significant role in physiological and biochemical processes in plant. the relationship between a soil testing extractant vs. plant nutrient uptake should be a determining parameter in the selection of a soil testing method. the objective of this study was to evaluate different extractants employed for extracting available k in 10...

Context The NaHCO3-extractable soil K test (Colwell K) is the most frequently used method for across Australia, but there still uncertainty about suitability of testing guidelines heavy-textured soils.Aims To determine whether Colwell suitable predicting plant-available on loam- and clay-textured types developed from highly weathered parent materials in Western Australia (WA).Methods Nine metho...

A growth chamber pot experiment and a field plot experiment were conducted with the installation of rhizobags to study the effects of repeated phytoextraction by Sedum plumbizincicola on the bioavailability of Cd and Zn in the rhizosphere and bulk soil Repeated phytoextraction gave significantly lower Cd and Zn concentrations in both rhizosphere and bulk soil solutions compared with soil withou...

Four fl-endorphin-like peptides from bovine brain extracts have been identified hy their behavior in CMcellulose chromatography, gel filtration, high-performance liquid chromatography, and radioimmunoassay. Two of them have been isolated in sufficient quantity for amino acid analysis, radioimmunoassay, and radioreceptor assay. One peptide has an amino acid com osition nearly identical to that o...

A green one-pot synthesis of 5H-Chromeno[4,3-b]pyridin-5-one derivatives which are the main core natural product Polyneomarline C is described by reaction 4-chloro-3-formyl coumarin and different cyclic acyclic compounds having active methylene group in presence Et3N NH4OAc EtOH. The advantages this strategy good yields, no need for chromatographic separation absence heavy metal catalysts toxic...

A high-performance size-exclusion chromatography-evaporative light scattering detector method was used to separate, detect and quantify galacturonic acid (GA) oligomers. In 40 mM acetic acid GA monomer, dimer and trimer could be separated with baseline resolution but polygalacturonic acid (PGA) precipitated and could not be eluted from the column. An NH4OAc, pH 3.7, buffer was developed as the ...

Accumulation of phosphorus (P) for Florida soils under citrus production may have an impact on groundwater and nearby streams and lakes. Six extracting solutions including Mehlich3, Bray1, double-acid, ammonium bicarbonate-DTPA (ABDTPA), neutral NH4OAc, and water were used to investigate P accumulation for 44 surface soils. The samples have been collected from old groves in 7 major citrus produ...