scholarly journals Novel Nanobiocomposites Based on Natural Polysaccharides as Universal Trophic Low-Dose Micronutrients

2021 ◽  
Vol 22 (21) ◽  
pp. 12006
Author(s):  
Spartak S. Khutsishvili ◽  
Alla I. Perfileva ◽  
Olga A. Nozhkina ◽  
Tatjana V. Ganenko ◽  
Konstantin V. Krutovsky
Keyword(s):  
Low Dose ◽  
Solanum Tuberosum L ◽  
Soil Microflora ◽  
Natural Soil ◽  
Plant Tissues ◽  
Paramagnetic Resonance ◽  
Phytopathogenic Bacterium ◽  
Toxicological Effects ◽  
Potato Plants ◽  
Electron Paramagnetic

New promising manganese-containing nanobiocomposites (NCs) based on natural polysaccharides, arabinogalactan (AG), arabinogalactan sulfate (AGS), and κ-carrageenan (κ-CG) were studied to develop novel multi-purpose trophic low-dose organomineral fertilizers. The general toxicological effects of manganese (Mn) on the vegetation of potatoes (Solanum tuberosum L.) was evaluated in this study. The essential physicochemical properties of this trace element in plant tissues, such as its elemental analysis and its spectroscopic parameters in electron paramagnetic resonance (EPR), were determined. Potato plants grown in an NC-containing medium demonstrated better biometric parameters than in the control medium, and no Mn accumulated in plant tissues. In addition, the synthesized NCs demonstrated a pronounced antibacterial effect against the phytopathogenic bacterium Clavibacter sepedonicus (Cms) and were proved to be safe for natural soil microflora.

scholarly journals Activation of Cadmium Under Simulated Solar Illumination and Its Impact on the Mobility of Cd in Flooded Soils

2021 ◽  
Author(s):  
Bihao Luo ◽  
Chenfeng Xiao ◽  
Yuling Liu ◽  
Li Li ◽  
Liang Peng ◽  
...  
Keyword(s):  
Fold Increase ◽  
Environmental Water ◽  
Solar Irradiation ◽  
Natural Soil ◽  
Release Kinetic ◽  
Flooded Soils ◽  
Paramagnetic Resonance ◽  
Water Ph ◽  
The Stability ◽  
Electron Paramagnetic

Abstract In waterlogged paddy soils, cadmium (Cd) can be precipitated as cadmium sulfide (CdS) under reductive environment, thereby limiting the absorption of Cd by plants. Multiple environmental factors (such as water, pH, Eh, etc.) played a role in the control of Cd mobility and bioavailability. In this study, we investigated the influence of the solar irradiation on the photo-dissolution of synthetic CdS-montmorillonite composites (CdS-M) in solution and the stability of Cdin natural soil. The release kinetic of Cd2+ showed that after the irradiation of simulated sunlight, CdS-M composites became less stable compared to the dark control. The solar irradiation seemed to enhance the release of Cd2+ from CdS significantly and continuously. Electron paramagnetic resonance (EPR) and quenching experiments confirmed that the photogenerated holes, O2·- and •OH were possibly involved in the photo-induced release of Cd2+, while the holes was primarily responsible for the reaction.Irradiation under alkaline solution or the presence of DOM, PO43-, CO32- and urea markedly inhibited the photodissolution process of CdS. The photo-mediated activation of Cd was further confirmed in paddy soil under natural sunlight, with a nearly 3-fold increase in concentration of extractable Cd during the 15 days irradiation. This study highlights the importance of photochemical transformation of Cd in the environmental water and soil.

ELECTRON PARAMAGNETIC RESONANCE STUDIES OF PHASE TRANSITIONS IN KCN

1976 ◽  
Vol 37 (C7) ◽  
pp. C7-241-C7-246 ◽  
Author(s):  
J.P. VON DER WEID ◽  
L.C. SCAVARDA DO CARMO ◽  
R. R. DO SANTOS ◽  
B. KOILLER ◽  
S. COSTA RIBEIRO ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Phase Transitions ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

Electron paramagnetic resonance in silicon and germanium

1964 ◽  
Vol 83 (7) ◽  
pp. 433-502 ◽  
Author(s):  
L.D. Bogomolova ◽  
V.N. Lazukin ◽  
I.V. Chepeleva
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Paramagnetic Resonance ◽  
Silicon And Germanium ◽  
Electron Paramagnetic
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