Chemosphere
Institute of Chemical Process Fundamentals, Czech Academy of Sciences, Rozvojová 1/135, 165 02, Prague 6, Czech Republic.
Published: October 2023
Isotopic analysis of specific compounds in aerosols can be a useful tool when studying atmospheric processes. Here, we present the results of stable carbon isotope ratio (δC) measurements performed on a one-year set (n = 96, Sep. 2013-Aug. 2014) of dicarboxylic acids and related compounds in PM at a rural Central European background site, Košetice (Czech Republic). The most C enriched acid was oxalic (C, annual average = -16.6 ± 5.0‰) followed by malonic (C, avg. = -19.9 ± 6.6‰) and succinic (C, avg. = -21.3 ± 4.6‰) acids. Thus, δC values decreased with an increase in carbon numbers. Azelaic acid (C, avg. = -27.2 ± 3.6‰) was found to be the least C enriched. A comparison of δC of dicarboxylic acids from other background sites, especially in Asia, shows similar values to those from the European site. This comparison also showed that C is more C enriched at background sites than at urban ones. In general, we did not observe significant seasonal differences in δC values of dicarboxylic acids at the Central European station. We observed statistically significant differences (p value < 0.05) between winter and summer δC values solely for C, glyoxylic acid (ωC), glutaric acid (C) and suberic acid (C). The only significant correlations between δC of C and δC of C were found in spring and summer, suggesting that the oxidation of C to C is significant in these months with a strong contribution from biogenic aerosols. The strongest season-independent annual correlation was observed in δC values between C and C, the two dominant dicarboxylic acids. Therefore, C appears to be the main intermediate precursor of C throughout the whole year.
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http://dx.doi.org/10.1016/j.chemosphere.2023.139393 | DOI Listing |
Curr Microbiol
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Department of Microbiology, Faculty of Science, Kasetsart University, Chatuchak, Bangkok, 10900, Thailand.
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School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
Background: Headaches are more prevalent in patients with multiple sclerosis compared with the general population. However, headaches are still considered a rare symptom of multiple sclerosis, especially when they appear as an initial symptom. The occurrence of a headache as a symptom of radiologically isolated syndrome (RIS) is uncommon, and it can significantly increase the likelihood of developing multiple sclerosis.
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Institute of Horticultural Production Systems, Fruit Science Section, Leibniz University Hannover, Herrenhäuser Straße 2, 30419, Hannover, Germany.
The mango cultivar 'Apple' is commercially important in Kenya but highly susceptible to russeting. Russeting refers to an area of fruit skin where the primary (epidermal) surface has been replaced by a secondary (peridermal) surface. The objective was to establish histologies, gene expressions and chemical compositions of a natural periderm, a wound-induced periderm and of cuticles of an un-russeted skin.
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Institute of Agricultural Environmental Resources, Yunnan Academy of Agricultural Sciences, Kunming, 650205, People's Republic of China.
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College of Pharmacy, Anhui University of Chinese Medicine, Hefei, 230012, China.
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