Humic substances are a collection of colored organic acids characterized by high molecular weight and low nitrogen (N) content that are thought to be biologically recalcitrant. We examined a suite of nonaxenic estuarine phytoplankton isolates to determine their ability to take up 15N-labeled humic substances formed in the laboratory and supplied as the sole N source. All 17 estuarine and coasta...

Purpose: To evaluate the influence of a humic-fulvic acid substance on quantitative yield residual foci DNA double-strand break (DSB) repair protein-marker - phosphorylated histone H2AX (γH2AX) and proliferation activity in culture human mesenchymal stromal cells (MSCs) 24, 48, 72 h after exposure to X-ray radiation at doses 2, 4 10 Gy. Material methods: Through 24 hours incubation MSCs with ac...

Iron deficiency, which severely decreases the plant yield and quality, is one of major problems calcareous soils. Foliar applications humic substances and/or Fe fertilizers are environmentally friendly methods to cope with deficiency. The aim this study was investigate combined effect Fe/nano humic/fulvic acid-based biostimulant foliar on content growth parameters spinach. Treatment solutions w...

The effects of humic acid on poliovirus type 1 recovery from water by Zeta Plus 60S filters were investigated. The humic acid interfered by preventing virus adsorption to the filters, and the interference increased as a function of the amount of humic acid filtered. Humic acid decreased virus adsorption when filtered before the virus, but did not elute virus which had adsorbed to the filters. T...

The humic substance consists of acid, fulvic and humin. Humic acid is a useful metal complexing agent, good dispersant, redox agent. showed an auxin-like activity thus promoted root growth development. It positively affected soil’s physical, chemical, biological properties. Hence, indirectly improved plant by chelating nutrients to the plant. However, converted carcinogen compounds in chlorinat...

Humic substances mainly humic acids constitute the major fraction of natural organic matter in water supplies. They play an important role in the formation of harmful disinfection by products. Degradation of humic acids by means of ultraviolet radiation and ultrasonic irradiation processes was investigated in a laboratory-scale batch photoreactor equipped with an 300 W immersed-type medium-pres...

A comparison is drawn between fungal humic acid produced by Aspergillus niger X1 and soil humic acid regarding elementary and functional groups analysis. Elementary and functional groups analysis show that unhydrolyzed fungal humic acid contained more H and N per unit weight, more alcoholic OH but lower CO2H and phenolic OH groups than unhydrolyzed soil humic acids. The C and N content of 6(N) ...