Publications by authors named "G Michalski"
Atmospheric ammonia (NH) and ammonium (NH) can substantially influence air quality, ecosystems, and climate. NH volatilization from fertilizers and wastes (v-NH) has long been assumed to be the primary NH source, but the contribution of combustion-related NH (c-NH, mainly fossil fuels and biomass burning) remains unconstrained. Here, we collated nitrogen isotopes of atmospheric NH and NH and established a robust method to differentiate v-NH and c-NH.
View Article and Find Full Text PDFArticle Synopsis
- The study analyzes nitrate levels in water sources in Pakistan, finding significant contamination levels: hand pump (HP) samples ranged from 31 mg/L to 59 mg/L, bore hole (BH) from 20 mg/L to 79 mg/L, and tube well (TW) from 29 mg/L to 55 mg/L.
- Statistical methods, including Pearson correlation coefficient and Hierarchical Cluster Analysis (HCA), were used to investigate relationships among various water quality parameters like pH, electrical conductivity, temperature, and dissolved oxygen in groundwater.
- Strong correlations were identified between specific parameters: HP had a correlation of 1 between electrical conductivity (EC) and total dissolved solids (TDS), while similar
Formation pathways and sources of atmosphere nitrate (NO) have attracted much attention as NO had detrimental effects on Earth's ecosystem and climate change. Here, we measured nitrogen (δN-NO) and oxygen (δO-NO and ΔO-NO) isotope compositions in nitrate aerosols at the Qomolangma station (QOMS) over the Himalayan-Tibetan Plateau (HTP) to quantify the formation mechanisms and emission sources of nitrate at the background site. At QOMS, the enhanced NO concentrations were observed in the springtime.
View Article and Find Full Text PDFOral mucositis (OM) is a treatment-limiting adverse side effect of radiation and chemotherapy. Approximately 80% of patients undergoing radiotherapy (RT) for head and neck cancers (HNC) develop OM, representing a major unmet medical condition. Our understanding of the immunopathogenesis of OM is limited, due in part to the surprising paucity of information regarding healing mechanisms in the oral mucosa.
View Article and Find Full Text PDFSince the industrial revolution, it has been assumed that fossil-fuel combustions dominate increasing nitrogen oxide (NO) emissions. However, it remains uncertain to the actual contribution of the non-fossil fuel NO to total NO emissions. Natural N isotopes of NO in precipitation (δN) have been widely employed for tracing atmospheric NO sources.
View Article and Find Full Text PDF