Environmental Science and Pollution Research - Under the action of different activators, persulfate can produce sulfate radicals (SO4·–) with strong oxidizing ability, which can destruct... 相似文献
Organisms are increasingly exposed to ultraviolet (UV) rays of sunlight, due to the thinning of the ozone layer and its widespread use in sterilization processes, especially against the SARS-CoV-2 virus. The present study was conducted with the purpose of evaluating the damages of UV-A and UV-C radiations in Allium cepa L. roots. The effects of two different types of UV on some physiological, biochemical, cytogenotoxic, and anatomical parameters were investigated in a multifaceted study. Three groups were formed from Allium bulbs, one of which was the control group. One of the other groups was exposed to 254 nm (UV-C) and the other to 365 nm (UV-A) UV. Growth retardation effect of UV was investigated with respect to germination percentage, total weight gain, and root elongation, while cytogenotoxicity arisen from UV exposure was analyzed using mitotic index (MI) and chromosomal aberration (CA) and micronucleus (MN) frequency. Oxidative stress due to UV application was investigated based on the accumulation of malondialdehyde (MDA) and the total activities of superoxide dismutase (SOD) and catalase (CAT) enzymes. Also, anatomical changes induced by UV-A and UV-C were analyzed in root meristematic cells. UV treatments caused significant reductions in growth-related parameters. Both UV treatments caused a significant increase in MDA levels and induction of SOD and CAT enzymes in root meristematic cells. A decrease in MI and an increase in the frequency of MN and CAs were observed in root tip cells, indicating the cytogenotoxic effect of UV application. Anatomical damages such as epidermis cell damage, cortex cell damage, necrotic zones, giant cell nucleus, and indistinct transmission tissue occurred in cells exposed to UV. All of the physiological, biochemical, cytogenetic, and anatomical damages observed in this study were more severe in cells treated with UV-C compared to UV-A. This study suggested that UV exposure triggered growth inhibition, cytogenotoxicity, oxidative stress, and meristematic cell damages in A. cepa roots depending on the wavelength.
Environmental Science and Pollution Research - N-doped carbon fibers (NCFs) were in situ prepared by Camellia sinensis branches waste through hydrothermal carbonization with urea/ZnCl2 at... 相似文献
A study of water quality, land use, and population variations over the past three decades was conducted in eastern Massachusetts
to examine the impact of urban sprawl on water quality using geographic information system and statistical analyses. Since
1970, eastern Massachusetts has experienced pronounced urban sprawl, which has a substantial impact on water quality. High
spatial correlations are found between water quality indicators (especially specific conductance, dissolved ions, including
Ca, Mg, Na, and Cl, and dissolved solid) and urban sprawl indicators. Urbanized watersheds with high population density, high
percentage of developed land use, and low per capita developed land use tended to have high concentrations of water pollutants.
The impact of urban sprawl also shows clear spatial difference between suburban areas and central cities: The central cities
experienced lower increases over time in specific conductance concentration, compared to suburban and rural areas. The impact
of urban sprawl on water quality is attributed to the combined effects of population and land-use change. Per capita developed
land use is a very important indicator for studying the impact of urban sprawl and improving land use and watershed management,
because inclusion of this indicator can better explain the temporal and spatial variations of more water quality parameters
than using individual land use or/and population density. 相似文献