[Metabolites differences between plaque biofilms of children with different levels of dental caries].

Purpose: To explore the differences between plaque biofilms of children with different caries activities via metabolomics.

Methods: A case-control study was conducted to investigate the oral health-related behaviors of children in caries-free (CF), low level of early childhood caries(LECC) and high level of early childhood caries (HECC) groups and to collect supragingival plaque biofilms. Untargeted metabolomics was used to detect the compositions of plaque biofilm metabolites in three groups.

Evaluation of hydrogen storage in sandstone reservoirs using H nuclear magnetic resonance spectroscopy.

Evaluation of the hydrogen storage capacity of porous rocks is crucial for underground hydrogen storage. Using H nuclear magnetic resonance (NMR) spectroscopy, we successfully characterized the hydrogen responses and identified storage mechanisms in Berea sandstone under varying water saturation. The results indicate that the injected hydrogen behaves as a free gas phase and is capable of occupying the empty pore volume regardless of the saturation state.

Influence of UV wavelength variations on tetracycline adsorption by polyethylene microplastics in aquatic environments.

The effect of ultraviolet (UV) light on structural changes is a significant concern, particularly regarding the weathering and aging effects on microplastics (MPs). This research focused on examining how various UV light wavelengths (UVC, UVB, and UVA) influence the adsorption behavior of aged polyethylene (PE) MPs toward tetracycline (TC). To explore the adsorption mechanism in detail, adsorption kinetics were studied under different UV light wavelengths.

A General Platform for Copper-Catalyzed Atom Transfer Radical Addition with Electron-Deficient Olefins.

We disclose a broad platform for copper-catalyzed atom transfer radical addition (ATRA) of electron-deficient olefins. Catalytic Cu(dtbbpy)(OTf) enables radical addition of electron-deficient alkyl halides to acrylates, acrylamides, and vinyl sulfones in fair to excellent yields. The resultant ATRA products can be used in a variety of telescoped reactions, including substitution with basic amine nucleophiles to afford α-amino esters.

Fluoxetine Alters the Biophysics of DPPC and DPPG Bilayers through Phase-Dependent and Electrostatic Interactions.

Lipid membranes can control the permeability of a pharmaceutical drug, whereas the drug can induce changes in the structural and biophysical properties of the membranes. Understanding this interplay of drug-lipid membrane interactions can be of great importance in drug design. Here, we present a molecular dynamics study to provide insights into the interactions between the antidepressant fluoxetine and 1,2-dipalmitoyl--glycero-3-phosphocholine (DPPC) or 1,2-dipalmitoyl--glycero-3-phosphoglycerol (DPPG) bilayers.