Insight into the Role of Water-Soluble Organic Solvents for the Cloud Condensation Nuclei Activation of Cholesterol

Organic aerosol is ubiquitous, and partially soluble organic particles can uptake water, form droplets, and act as cloud condensation nuclei (CCN). Cholesterol is a well-known organic aerosol. Cholesterol is insoluble in water (2O at 293 K) but readily dissolves in organic solvents. In this study, we examine the ability of cholesterol generated in 7.2%, 10.4%, and 18.9% (by volume) dilutions of three water-soluble organic solvents (ethanol, 2-propanol, and acetone) to act as CCN. The measured apparent particle hygroscopicity, κ, can vary over 2 orders of magnitude, from ∼0.001 to 0.1. We use statistical analysis of variance (ANOVA) to quantify experimental design factors, not explicitly addressed in traditional theory, that modify κ-values. Results show that (i) particle sizes (electrical mobility and aerodynamic diameters) are important for apparent hygroscopicity κ-values and that (ii) atomized aerosol formed in the presence of organic solvents modifies particle size and droplet surface tension at the air–water interface and promotes droplet formation. As the volume of water (dilution) in the atomized solution increases, the organic solvent decreases and κ decreases. Increases in organic solvent concentration decrease droplet surface tension and change aerosol shape. Thus, the apparent κ is corrected with surface tension and shape factor data. The results imply that miscible atmospheric organic solvents that readily adsorb and solvate in water enhance the droplet forming potential of cholesterol and may thus extend to other atmospheric water-insoluble organic particles

Vibrational and Electronic Spectral Study on 3,5-Dihydro-4H-Imidazol-4-One Derivatives Containing Organo-Selenium

<div><p>ABSTRACT</p><p>The Fourier transform infrared, Raman, and UV-visible absorption spectral analyses were carried out on five 3,5-dihydro-4H-imidazol-4-one derivatives containing organo-selenium. The ground-state geometries, vibrational wavenumbers, and infrared and Raman intensities were calculated by density functional theory using the B3PW91 functional and 6-311G(2df,p) basis set. Spectral analysis shows that the large conjugation effect makes the C=N stretching vibration of the skeleton shift by 50–100 cm⁻¹ toward the lower wavenumber. The UV-visible absorption spectra were studied by the time-dependent density functional theory method with the polarizable continuum model using B3LYP and PBE0 functionals. Theoretical calculations reveal that the strong absorption bands at 368–411 nm arise from the n → π* transition, and the sharp bands at 208–211 nm arise from the π → π* transition.</p> </div

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PMMA distribution pattern.

<p>A. the minimum distance of PMMA to the endplate; B. percentage of the height PMMA in vertebral body: the highest portion of PMMA as “a”, the highest portion of vertebral body as “b”, the “percentage” was calculated as “a/b”. C, D. the conditions that the minimum distances of PMMA to the upper and the lower endplates were zero at the same time was recorded as “contacted”; E. the other conditions were recorded as “un-contacted”. PMMA = polymethylmethacrylate.</p

Measurement of vertebral height and kyphosis angle.

<p>A. vertebral body height, the distance between the two tangents parallel to the upper and lower endplates lines; B. kyphotic angle was measured using Cobb method: the angle between a line drawn parallel to the superior endplate of the adjacent upper vertebra and the inferior endplate of the lower vertebra.</p

Risks of recompression related to PMMA dispersion.

Risks of recompression related to PMMA dispersion.</p

The pattern of PMMA distribution.

<p>The pattern of PMMA distribution.</p

Flowchart describing the research process.

BackgroundLow fertility and adverse pregnancy outcomes are commonly observed in women with chronic kidney disease (CKD). However, a causal relationship between low fertility and adverse pregnancy outcomes with CKD remains unclear. Besides, whether mild kidney dysfunction can affect fertility and pregnancy still needs exploration. Hence, this study aimed to investigate the causal effect of kidney damage on fertility and pregnancy using Mendelian randomization (MR).MethodsWe first used two-sample MR to examine the effects of kidney damage on fertility and pregnancy. Next, we introduced the Bayesian model averaging MR analysis to detect major causal relationships and render the results robust. The genetic instruments and outcome data were derived from various large genome-wide association studies.ResultsAdverse pregnancy outcomes: Our analyses supported a suggestive causal effect of CKD and estimated glomerular filtration rate (eGFR) rapid on stillbirth, with CKD having an odds ratio (OR) of 1.020 [95% confidence interval (CI) 1.002 to 1.038] and eGFR rapid having an OR of 1.026 (95% CI 1.004–1.048). We also discovered a suggestive causal effect of eGFR on spontaneous abortion, with an OR of 2.63 (95% CI 1.269 to 5.450). Moreover, increased urinary albumin-to-creatinine ratio (UACR) was regarded as a potential risk factor for pre-eclampsia (OR = 1.936; 95% CI 1.065 to 3.517) and gestational hypertension (OR = 1.700; 95% CI 1.002 to 2.886). Fertility assessment: The results indicated that eGFR and UACR had a suggestive causal relationship with the anti-Müllerian hormone level (eGFR beta: 1.004; UACR beta: 0.405).ConclusionsOur study used MR to demonstrate a suggestive causal relationship between kidney damage and fertility and pregnancy. We reported that mild kidney dysfunction might be a risk factor for reduced fertility and adverse pregnancy outcomes. Dynamic renal detection may help preserve fertility and reduce the risk of pregnancy loss.</div

Basic SNP information and F-statistic.

BackgroundLow fertility and adverse pregnancy outcomes are commonly observed in women with chronic kidney disease (CKD). However, a causal relationship between low fertility and adverse pregnancy outcomes with CKD remains unclear. Besides, whether mild kidney dysfunction can affect fertility and pregnancy still needs exploration. Hence, this study aimed to investigate the causal effect of kidney damage on fertility and pregnancy using Mendelian randomization (MR).MethodsWe first used two-sample MR to examine the effects of kidney damage on fertility and pregnancy. Next, we introduced the Bayesian model averaging MR analysis to detect major causal relationships and render the results robust. The genetic instruments and outcome data were derived from various large genome-wide association studies.ResultsAdverse pregnancy outcomes: Our analyses supported a suggestive causal effect of CKD and estimated glomerular filtration rate (eGFR) rapid on stillbirth, with CKD having an odds ratio (OR) of 1.020 [95% confidence interval (CI) 1.002 to 1.038] and eGFR rapid having an OR of 1.026 (95% CI 1.004–1.048). We also discovered a suggestive causal effect of eGFR on spontaneous abortion, with an OR of 2.63 (95% CI 1.269 to 5.450). Moreover, increased urinary albumin-to-creatinine ratio (UACR) was regarded as a potential risk factor for pre-eclampsia (OR = 1.936; 95% CI 1.065 to 3.517) and gestational hypertension (OR = 1.700; 95% CI 1.002 to 2.886). Fertility assessment: The results indicated that eGFR and UACR had a suggestive causal relationship with the anti-Müllerian hormone level (eGFR beta: 1.004; UACR beta: 0.405).ConclusionsOur study used MR to demonstrate a suggestive causal relationship between kidney damage and fertility and pregnancy. We reported that mild kidney dysfunction might be a risk factor for reduced fertility and adverse pregnancy outcomes. Dynamic renal detection may help preserve fertility and reduce the risk of pregnancy loss.</div

Representative MR and X-ray images of recompression and non-recompression.

<p>A: Recompression: a: MRI showed the fracture of L2. b: X-ray images taken 1 day after surgery. c: X-ray images taken 12 months after surgery. B: Non-recompression. a: MRI showed the fracture of L2. b: X-ray images taken 1 day after surgery. c: X-ray images taken 12 months after surgery. MRI = magnetic resonance imaging.</p