Changes in the Levels of Short-Chain Acids and Tryptophan Metabolites in Mouse Intestine during Experimental Colitis.

The optimal balance of the intestinal microbiota is considered to be an essential part of the human body that affects many metabolic processes. However, the exact role of the gut microbiota in metabolism is still not fully understood. To investigate the metabolic role of gut microbiota, the content of short-chain fatty acids and tryptophan metabolites was studied in mice with sodium dextran sulfate-induced colitis.

Catalytic Effect of Potassium Xanthates and Related Compounds on Disulfide Bond Enrichment of Polyalkylene Sulfides Synthesized in the Course of Episulfide Polymerization.

The original method for the preparation of high-molecular-weight polyalkylene sulfides was reported. Assuming anomalous peculiarities of the reaction (high polymerization rates, high degrees of polymerization, and huge discrepancy between the expected values and the experimentally obtained values), the priority task was set to study the mechanism underlying the observed new type of polymerization. Thus, it was demonstrated that xanthate and related molecules could act as pure catalysts, facilitating both the chain-growth polymerization (ring-opening of episulfides) realized via an anionic route and the direct attack of the sulfur atom of one episulfide molecule on the methylene carbon atom of the second (neighbor) episulfide molecule, accompanied by the subsequent formation of a stable thiiranium-based zwitterionic adduct.

UV-assisted fluctuation-enhanced gas sensing by ink-printed MoS devices.

In this work, MoS flakes were printed on ceramic substrates and investigated toward 1-10 ppm of nitrogen dioxide (NO), 2-12 ppm of ammonia (NH), and 2-12 ppm acetone (CHO) under UV light (275 nm). The structure of overlapping MoS flakes and UV light assistance affected high responsivity to NO when DC resistance was monitored, and superior sensitivity to NH was obtained from the low-frequency noise spectra. MoS exhibited response and recovery times in hundreds of seconds and stability throughout the experiments conducted within a few months.

Absorption Spectra of AlGaN/GaN Terahertz Plasmonic Crystals-Experimental Validation of Analytical Approach.

Absorption spectra of AlGaN/GaN grating-gate plasmonic crystals with a period from 1 µm to 2.5 µm were studied experimentally at = 70 K using Fourier-transform infrared spectrometry. The plasmonic crystals exhibit distinct absorption lines of various plasmon harmonics across the 0.