Enrichment of anthropogenic organic matter and acetoclastic pathway dominates ebullition CH production in urban river.

Methane (CH) ebullition emission is recognized as an important contributor to CH fluxes in urban rivers, and understanding ebullition CH production and emission is important to accurately identify the global river carbon budget. However, the current generation pathways of ebullition CH in different types of rivers are still not fully understood. In this study, the isotope technique was used to investigate the production pathways of ebullition CH in different types of rivers through a combination of field investigation and incubation experiment in Shanghai rivers networks to explore the regulating factors of ebullition CH emission.

The impact of active sport tourism experiencescape perception on tourists' psychological recovery: the mediating role of flow experience.

Introduction: Based on the SOR framework, this study addresses the widening mental-health challenges-such as anxiety and depression-among urban populations in China amid rapid urbanization. While previous research has highlighted the "therapeutic" function of tourism, few studies have examined the specific mechanism by which the experiencescape of active sport tourism influences psychological recovery via flow experience. To fill this gap, we proposed an "S: active sport tourism experiencescape - O: flow experience - R: psychological recovery" research model.

ReaxFF MD simulations of graphitization of intact and O,N-doped amorphous carbon.

Understanding the impact of heteroatom doping on the structural evolution and graphitization of amorphous carbon is essential for the development of carbon-based anode materials. However, the underlying mechanisms remain poorly understood. In this study, molecular dynamics simulations employing reactive force field (ReaxFF) were systematically conducted to analyze the effects of temperature and oxygen (O) and nitrogen (N) heteroatom doping on the graphitization behavior of amorphous carbon.

Spatial distribution of Hg in Foliar and Road Dust in different Main Urban Function Area.

Shangrao City which is rich in mineral resources faces potential mercury (Hg) pollution in dust due to urban mining and industrial activities. To assess the potential health risks of Hg content, 35 foliar dust and 106 road dust samples were collected from 37 points in six urban functional areas. In order to analyze the Hg content and spatial distribution characteristics, the health risks were evaluated using US EPA guidelines.

Performance and mechanism of a novel aerobic phosphorus release/anoxic phosphorus uptake process for simultaneous nitrogen and phosphorus removal.

To investigate the feasibility of a novel Nitritation and Denitrification for Simultaneous Nitrogen and Phosphorus Removal system, a 133-day experiment was conducted. The results showed that combining aerobic phosphorus release capacity with denitrification phosphorus uptake capacity was feasible to achieve N and P removal. The removal efficiencies of TN and TP in ND-SNPR system were 98.

Raising wastewater collection and discharge standards will reduce greenhouse gas emissions from metropolitan rivers.

Urban rivers are increasingly recognized as significant sources for greenhouse gas (GHG) emissions. Few studies, however, quantify emissions of all three GHG from rehabilitating urban rivers that receive treated wastewater. This study analyzed carbon dioxide (CO), methane (CH), and nitrous oxide (NO) concentrations and diffusive fluxes from the Suzhou Creek in Shanghai that were investigated across the four seasons in 2021.

Prediction of Actinide-Ligand Complex Stability Constants by Machine Learning.

Sustainable application of nuclear energy requires efficient sequestration of actinides, which relies on extensive understanding of actinide-ligand interactions to guide rational design of ligands. Currently, the design of novel ligands adopts mainly the time-consuming and labor-intensive trial-and-error strategy and is impeded by the heavy-metal toxicity and radioactivity of actinides. The advancement of machine learning techniques brings new opportunities given a sensible choice of appropriate descriptors.

Tri-Coordinated Boron Species in Confined Boron Oxide Catalysts for Enhanced Low-Temperature Oxidative Dehydrogenation of Propane.

Boron-based catalysts exhibit great potential for oxidative dehydrogenation of propane (ODHP) to produce olefins. The straightforward synthesis of confined boron-based catalysts commonly using HBO is intractable because of its abundant hydroxyl groups easily interacting with the supports in a spatially nonselective manner. Herein, we managed to construct a confined BO@SiO catalyst showing an impressive low-temperature (400 °C) activity.

Design and computational screening of high-energy, low-sensitivity bistetrazole-based energetic molecules.

Bistetrazole-based compounds are novel high-nitrogen energetic molecules that have garnered attention in recent years. They possess a higher energy density and lower sensitivity, and are less challenging to synthesize than complex cage-like molecules. This study employed a molecular auto-generation mechanism to generate 35 322 bistetrazole-based molecules with 20 bridgeheads and 29 side substituents.

Phenotypic discrimination and characterization of microbial populations in enhanced biological phosphorus removal using single-cell raman spectroscopy-based methods.

Single-cell Raman spectroscopy (SCRS) represents a non-invasive, expedient, and label-free strategy for investigating the molecular composition of individual cells. In this study, we applied SCRS to perform qualitative and quantitative analyses of polyphosphate (polyP) accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs) within enhanced biological phosphorus removal (EBPR) systems, enabling their metabolic trait-based profiling and phenotypic classification. SCRS analysis revealed diverse metabolic profiles of metabolically active EBPR populations including unknown GAOs and PAOs performing GAO metabolism.

A comprehensive investigation of the occurrence and speciation of arsenic in the water, sediments and aquatic products in Dongping Lake, an important drinking water source in East China.

The total arsenic (TAs), inorganic arsenic (iAs) including arsenate (As(V)) and arsenite (As(III)) distribution in water, surface/core sediments and aquatic products in Dongping Lake was investigated. The pollution levels and associated risks were evaluated using the methods of geoaccumulation index, single factor index, health risk model and potential ecological risk index. The results showed that As(V) dominated across all environmental matrices.

Metagenomic analysis revealed community-level metabolic differences between full-scale EBPR and S2EBPR systems.

Side-Stream Enhanced Biological Phosphorus Removal (S2EBPR) has emerged as a promising technology addressing certain challenges of conventional Enhanced Biological Phosphorus Removal (EBPR), notably stability in phosphorus removal, yet the underlying mechanisms are not fully understood. Metagenomic analysis presents a powerful approach to elucidate community-level metabolic differences between EBPR and S2EBPR configurations. In this study, we compared three EBPR and three S2EBPR activated sludge communities using metagenomic analysis at taxonomy, key functional pathways/genes, and polyphosphate-metabolism marker genes.

Towards high-accuracy bacterial taxonomy identification using phenotypic single-cell Raman spectroscopy data.

Single-cell Raman Spectroscopy (SCRS) emerges as a promising tool for single-cell phenotyping in environmental ecological studies, offering non-intrusive, high-resolution, and high-throughput capabilities. In this study, we obtained a large and the first comprehensive SCRS dataset that captured phenotypic variations with cell growth status for 36 microbial strains, and we compared and optimized analysis techniques and classifiers for SCRS-based taxonomy identification. First, we benchmarked five dimensionality reduction (DR) methods, 10 classifiers, and the impact of cell growth variances using a SCRS dataset with both taxonomy and cellular growth stage labels.

Knowledgedriven design of boron-based catalysts for oxidative dehydrogenation of propane.

Metal-free boron-based materials exhibit remarkable performance in oxidative dehydrogenation of propane (ODHP). Rational design of boron-based catalysts requires a systematic understanding of the underlying mechanisms to constitute a knowledge base. This work provides a comprehensive view of the reaction mechanism of the boron-based ODH reaction and discusses the key features of the reaction systems, including the inhibition of deep oxidation, high olefin selectivity, and the role of water in the ODHP reaction.

Constructed wetlands using recycled aggregates for the improved treatment of tailwater.

Recycled aggregates from the construction industry could be effective materials for constructed wetland (CW) wastewater treatment systems. However, whether the plants or which kinds of plants can survive in CWs with recycled aggregates or not is still scarce and urgent to study. The effects of different plant species, and several operation parameters on tailwater treatment from the sewage plants by CWs with different substrates (mixed construction recycled aggregate [MCRA], red brick [RB], and gravel) are systemically studied.

In Honor of Professor Zhifang Chai.

We are delighted to dedicate this Special Issue to a leading figure in actinoid chemistry, Prof [...

Research progress on the regulatory mechanism of biofilm formation in probiotic lactic acid bacteria.

Probiotic lactic acid bacteria (LAB) must undergo three key stages of testing, including food processing, storage, and gastrointestinal tract environment, their beneficial effects could exert. The biofilm formation of probiotic LAB is helpful for improving their stress resistances, survival rates, and colonization abilities under adverse environmental conditions, laying an important foundation for their probiotic effects. In this review, the formation process, the composition and function of basic components of probiotic LAB biofilm have been summarized.

Unsupervised spike sorting for multielectrode arrays based on spike shape features and location methods.

Microelectrode arrays (MEAs) enable simultaneous measurement of spike trains from numerous neurons, owing to advancements in microfabrication technology. These probes are highly valuable for comprehending the intricate dynamics of neuronal networks. Spike sorting is a pivotal step in comprehensively analyzing the activity of neuronal networks from extracellular recordings.

In Situ Formation of B═O Bond in Oxidative Dehydrogenation of Propane and as a Hunter for Alkoxyl Radicals: A Computational Study.

B═O multiple bonds are fundamentally important owing to the unique property of B and its potential as a tool in catalysis. Herein by means of DFT calculations, we investigated the in situ generation of transient -B═O species in the nonmetallic inorganic boron oxides and demonstrated its superior ability to capture alkoxyl radicals under the conditions of oxidative dehydrogenation of propane (ODHP). Boron-containing materials are emerging as promising catalysts for ODHP, while an extensive understanding of the underlying mechanisms remains challenging.

A Connected Convolutional Neutral Network Protocol for Design of Two-Dimensional Materials Based on Modified Graphdiyne.

In materials science, doping plays a crucial role in manipulating the electronic properties of materials. Conventional screening via a trial-and-error strategy is challenging owing to the enormous chemical space. We proposed a connected convolutional neutral network (CCNN) for quick screening of boron nitrogen (B-N) codoped graphdiyne in terms of band gap.

A thermodynamic model of the surface hydroxylation of γ-AlO.

Rational design of γ-alumina-based catalysts relies on an extensive understanding of the distribution of hydroxyl groups on the surface of γ-alumina and their physicochemical properties, which remain unclear and challenging to determine experimentally due to the structural complexity. In this work, by means of DFT and thermodynamic calculations, various hydroxylation modes of γ-alumina (110) and (100) surfaces at different OH coverages were evaluated, based on which a thermodynamic model to reflect the relationship between temperature and the surface structure was established and the stable hydroxylation modes under experimental conditions were predicted. This enables us to identify the experimentally measured IR spectra.

An Editorial for the Special Issue "Actinoids in Biologic Systems and Catalysis".

The recent few decades witnessed a quick growth in our knowledge in actinoid chemistry, particularly in actinoids' behaviors in catalysis and biologic systems [...