This paper is aimed at studying the performance back characteristics of DC corona in wire-to-plane gaps as influenced by back discharge at the ground plane. The back discharge is initiated at the ground plane through slits in a dielectric barrier covering the plane. The study includes the corona current-voltage characteristics of the gap as influenced by the wire radius and the spacing between the wire and plate, as well as the number of slits and width of each slit. Not only the current-voltage characteristics but also the corona initiation and the corona pulse frequency versus voltage characteristics of the gap are investigated in presence and absence of the dielectric barrier with slits.

The purpose of the present study is to investigate the role of hydrogen sulfide (H₂S), in improving resistance to common bean salt stress. Method shows that common bean seeds were soaked in water and in two concentrations of sodium hydrosulfide (50 and 100 µM) for 8 h. After 25 days from sowing, the pots were irrigated with water and with two concentrations of NaCl (75 and 150 mM) until the end of the experiment. Results revealed that H₂S relieved salt stress by decreasing growth inhibition and photosynthetic characteristics, and increasing osmolyte contents (proline and glycine betaine). Furthermore, H₂S reduced oxidative damage by lowering lipid peroxidation, electrolyte leakage, and reactive oxygen species production such as hydrogen peroxide, hydroxyl radicals, and superoxide anion by increasing non-enzymatic antioxidants such as ascorbic acid and glutathione, as well as enzymatic antioxidants

Purpose

This research studies the alleviation potential of N- or/and P- deprived Coccomyxa chodatii SAG 216–2 extracts as biostimulants on mercury stress (10 and 30 mg L⁻¹) of wheat seedlings.

Materials

The study includes the interactive effect of mercury and biostimulants on growth, reactive nitrogen and oxygen species, membrane stability, and antioxidant activity in wheat seedlings.

Results

The imposed toxic effects of Hg-stress on the studied parameters were to a great extent less noticeable under different algal extracts, and the magnitude of augmentation was P-deprived extract > P-&N-deprived extract > N-deprived extract > Normal algal extract. Higher Hg-tolerance modulated by algal extracts, especially P-deprived extract, was associated with high antioxidant capacity and ferric reducing power. These activities could instigate the antioxidant system (enzymatic and non-enzymatic) under Hg-stress …