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Acid Base - Europe PMC

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Last Updated: 15 November 2022

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Acid-base balance in hemodialysis patients in everyday practice.

Abnormalities in blood bicarbonates concentrations in patients with chronic kidney disease, particularly at the end-stage renal failure. The aim of the investigation was to determine the acid-base balance in everyday life, the effects of hemodialysis sessions, and potential correlations with medical and biochemical measurements in stable hemodialysis patients. Buffer bicarbonate concentration had only statistically significant effect on the bicarbonate concentration following dialysis. Both pre-HD acid-base parameters and post-HD pH were uninfluenced by buffer bicarbonate content. Before hemodialysis, we found strong inverse correlations between change in the serum bicarbonates and just two variables: pH and HCO 3. Before hemodialysis, patients with less 'acido' patients are required to have less 'acidotic' patients and less 'alkalotic' patients after the session are required to have less 'acidotic' patients.

Source link: https://europepmc.org/article/MED/35793495


Lewis Acid-Base Adducts for Efficient and Stable Cesium-Based Lead Iodide-Rich Perovskite Solar Cells.

Both theoretical simulations and experiments show that the noncoordinating anions, PF 6 - a Lewis base, can more effectively connect undercoordinated Pb 2+ to passivate iodide vacancy defects than the BF 4 - and absorbed I, and therefore the point defects are minimized. The NPMP+ can control the crystal growth and eventually homogenize the grain size and reduce the trap density, which would eventually homogenize the grain size and reduce the trap density. Therefore, the LABAs' action would raise the conversion efficiency of CsPb3 solar cells to 19. 02% under 1-sun illumination. After aging under ambient conditions for 60 days, the NPMP + and PF 6 -treated CsPbTh 3 film exhibits remarkable phase stability after storage in ambient air for 250 days, and the power conversion efficiency of corresponding solar cells is nearly 76% of the initial value.

Source link: https://europepmc.org/article/MED/36372547


Hydrophobic species-enabled acid-base multi-catalysis for stereoselective access to renewable trans -anethole.

PAS-Hf's porous structure and enhanced hydrophobicity ensured the establishment of more accessible and stable Lewis and Bru00f8nsted acid active sites, which could be used for rapid conversion of biomass-based 4-MOPP to AN in 0. 5 h. According to density functional theory calculations, the addition of PAS-Hf would ease the conversion process by lowering the reaction energy barrier of the rate-determining step. More than ten species of aldehydes and ketones may be extended to more than ten species of Lewis acid-base and Bru00f8nsted acid species.

Source link: https://europepmc.org/article/MED/36278834


The association between acid-base status and clinical outcome in critically ill COVID-19 patients admitted to intensive care unit with an emphasis on high anion gap metabolic acidosis.

Objective The aim of this research was to identify arterial blood gas abnormalities, with a focus on a high anion gap metabolic acidosis and measuring outcomes in coronavirus disease 2019 patients admitted to the ICU. Methods An retrospective, observational study was carried out in a tertiary hospital in Cape Town during the first and second COVID-19 waves. To compare mortality and survival, the Pearson 73 test or Fisher exact test as well as the Wilcoxon rank-sum test were used. 42 cases of alkalosis, 199 had a metabolic alkalosis, and 42 in the group with acidosis had a metabolic acidosis with an elevated AG of more than 17. Conclusion Most of the COVID-19 patients admitted to the ICU had an alkalosis, and those with acidosis had a less optimistic prognosis. Patients' characteristics were not related to higher AG metabolic acidosis.

Source link: https://europepmc.org/article/MED/36220779


SLC4A2, another gene involved in acid-base balancing machinery of osteoclasts, causes osteopetrosis.

The SLC4A2 is a member of the Na + -independence solute carrier family 4 of anion exchangers that control electroneutral exchange of Cl - for HCO 3 - and mediate intra- and extra-cellular pH, chloride concentration, and cell volume. Osteo osteoporosis in mice and cattle has been documented by bi-allelic Slc4a2 loss-of-function mutations, but not in humans. We have found bi-allelic pathogenic variants in SLC4A2 in a patient with severe renal insufficiency, indicating that SLC4A2 deficiency causes a new form of autosomal recessive osteoporosis.

Source link: https://europepmc.org/article/MED/36343920


Self-Assembly of a U(VI)-Containing Polytungstate Tetramer with Lewis Acid-Base Catalytic Activity for a Dehydration Condensation Reaction.

Notably, U4 may act as a versatile Lewis acid-base catalyst for the synthesis of pyrazoles by condensation of hydrazines with 1,3-diketones under mild conditions, which can be attributed to the Lewis acidity of U and Lewis basicity of u03b3-SiW 10's synergetic effect.

Source link: https://europepmc.org/article/MED/36322943


Obtainment of lignocellulose degradation microbial community: the effect of acid-base combination after restrictive enrichment.

Several cellulose-degrading microbial populations have been added from various sources. A technique used alongside restricted enrichment culturing is to combine two microbial populations with acidic and basic characteristics. Understanding how changes to microbial communities influence community's identity and function is critical for mechanistic reconstruction of microbiomes. To elucidate determination of acid-base ratios, we investigated shifts in microbial community structure in this research. The acid-base combination solved the turbulence caused by restricted screening enrichment's randomness; it was also a cost-effective method for obtaining a high-quality lignocellulose-degrading microbial community.

Source link: https://europepmc.org/article/MED/36318370


Friedel-Crafts Acylation of Aminocarboxylic Acids in Strong Brønsted Acid Promoted by Lewis Base P 4 O 10 .

The amino acid group in amino acid is sufficiently basic to be protonated in strong acids, and, as a result, ionization of the carboxylic acid to an acylium ion is hindered due to charge-charge rejection. If the Lewis base P4 O 10 is included, we discovered that Friedel-Crafts acylation with aminocarboxylic acids can proceed smoothly even in a heavy Bruchylic acid. According to Density's estimates, P 4 O 10 neutralizes the protonated amine, converting the N-H covalent bond to a N-hydrogen bond and making the carboxylic acid OH functionality a good leaving group.

Source link: https://europepmc.org/article/MED/36318089


Acidic environments trigger intracellular H+-sensing FAK proteins to re-balance sarcolemmal acid-base transporters and auto-regulate cardiomyocyte pH.

Methods and findings Following left ventricle cryo-damage, a diffuse pattern of low extracellular pH was identified by acid-sensing pHLIP. Despite this, the pHi level in the beating heart was still normal. When cells are superfused at physiological pH, the effect of this adaptation on pH is revealed as a cytoplasmic alkalinization. Conversely, mice treated oral bicarbonate had reduced myocardial NHE1 expression, which is consistent with a needs-dependent expression of pHi-regulatory transporters. The adaptation of sustained acidity can be replicated in vitro using neonatal ventricular myocytes incubated at low pH for 48 h. Slc9a1 up-regulation and Slc4a2 down-regulation are both related to a rise in NHE1 and lower CBE activities. The FAK protein Pyk2 phosphorylation was reduced within minutes of exposure to acidity, supporting pHi control in the case of adaptive changes to pHi control. Conclusions Cardiomyocytes fine-tuned the expression of pHi-regulators so that the pHi level is at least 7. 0.

Source link: https://europepmc.org/article/MED/34897412

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions