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Start Over Subject sulphur dioxide

1. Recovery of net photosynthetic rate after SO2 fumigation in Quercus acutissima, Pinus densiflora, Populus alba×glandulosa, and Acanthopanax sessiliflorus

Creator:
Woo, S. Y., Kwon, K. W., Lee, J. C., Choi, J. H., and Kang, B. S.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
compensation, recovery, resistance, and sulphur dioxide
Language:
Multiple languages
Description:
After SO2 fumigation, Quercus acutissima and Pinus densiflora maintained high net photosynthetic rate (PN) and did not show visible symptoms of damage. In contrast, Populus alba×glandulosa and Acanthopanax sessiliflorus had significantly reduced PN and showed visible necrosis. and S. Y. Woo ... [et al.].
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Sulfur dioxide relaxes rat aorta by endothelium-dependent and -independent mechanisms

Creator:
Y.-K. Wang, Ren, A.-J., Yang, X.-O., Wang, L.-G., Rong, W.-F., Tang, C.-S., Yuan, W.-J., and Lin, L.
Type:
article, články, model:article, and TEXT
Subject:
Fyziologie člověka a srovnávací fyziologie, oxid siřičitý, iontové kanály, endotel, aorta, krysa obecná, sulphur dioxide, ion channels, endothelium, Rattus rattus, vasorelaxation, 14, and 612
Language:
English
Description:
This study aimed to investigate the vasoactivity of sulfur dioxide (SO2), a novel gas identified from vascular tissue, in rat thoracic aorta. The thoracic aorta was isolated, cut into rings, and mounted in organ-bath chambers. After equilibrium, the rings were gradually stretched to a resting tension. Isometric tension was recorded under the treatments with vasoconstrictors, SO2 derivatives, and various drugs as pharmacological interventions. In endothelium-intact aortic rings constricted by 1 μM phenylephrine (PE), SO2 derivatives (0.5 – 8 mM) caused a dose-dependent relaxation. Endothelium removal and a NOS inhibitor L-NAME reduced the relaxation to low doses of SO2 derivatives, but not that to relatively high doses (≥ 2 mM). In endothelium-denuded rings, SO2 derivatives attenuat ed vasoconstriction induced by high K+ (60 mM) or CaCl2 (0.01-10 mM). The relaxation to SO2 derivatives in PE-constricted rings without endothelium was significantly inhibited by blockers of ATP-sensitive K+ (KATP) and Ca2+-activated K+ (KCa) channels, but not by those of voltage-dependent K+ channels, Na+-K+-ATPase or Na+-Ca2+ exchanger. SO2 relaxed vessel tone via endothelium-dependent mechanisms associated with NOS activation, and via endothelium-independent mechanisms dependent on the inhibition of voltage-gated Ca2+ channels, and the opening of KATP and KCa channels., Y.-K- Wang., and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public