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J Environ Manage 2021 Apr 19;290:112610. Epub 2021 Apr 19.

Graduate Program in Urban Engineering, Federal University of São Carlos, Rodovia Washington Luís (SP-310) km 235, São Carlos, 13565-905 SP, Brazil. Electronic address:

River sediments have the capability to accumulate and absorb traces of anthropic environmental degradation. In this work, we investigated the effects of urban land use on the composition of physical sediment. For this purpose, sediment profiles were collected in the wet and dry seasons and in locations with mixed land-use. Read More

Chemistry 2021 Apr 22. Epub 2021 Apr 22.

Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an, 710069, P. R. China.

A nickel-catalyzed intramolecular coupling of thioesters and olefins has been developed for the efficient synthesis of spirocycles, a privileged scaffold commonly found in natural products. This transformation is characterized by the simultaneous transfer of both acyl and thiol moieties to the alkene, with the suppression of decarbonylation and β-hydrogen elimination. Initial mechanistic investigations are consistent with an oxidative addition/olefin insertion/reductive elimination mechanism. Read More

Nanoscale 2021 Apr 23;13(13):6341-6356. Epub 2021 Mar 23.

Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.

Designing spatial and architectural features across from the molecular to bulk scale is one of the most important topics in materials science which has received a lot of attention in recent years. Looking back to the past research, findings on the influences of spatial features denoted as porous structures on the applications related to mass transport phenomena have been widely studied in traditional inorganic materials, such as ceramics over the past two decades. However, due to the difficulties in precise control of the porous structures at the molecular level in this class of materials, the mechanistic understanding of the effects of spatial and architectural features across from the molecular level to meso-/macroscopic scale is still lacking, especially in electrochemical reactions. Read More

ACS Appl Mater Interfaces 2021 Apr 22. Epub 2021 Apr 22.

Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States.

Fabrication of dual-emitting materials for HS sensing under environmental and biological conditions is currently of great interest. In this work, a new chemically stable metal supramolecular complex [Zn(pda)(HO)]·(HO) (Znpda, pda = 1,10-phenanthroline-2,9-dicarboxylic acid), with accessible uncoordinated carboxylic oxygen sites, is solvothermally synthesized. It can serve as a host in luminescent hybrid composites. Read More

Biotechnol Appl Biochem 2021 Apr 22. Epub 2021 Apr 22.

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 30, Puzhu South Road, Nanjing, 211816, China.

Objective: This work designs an in vitro multi-enzyme system to produce CDP-choline form D-ribose, and develop an optimization procedure for one-pot multi-enzyme catalytic system.

Results: The entire process integrated ten enzymes, and an efficient acetate kinase/acetyl phosphate-based ATP regeneration module was applied. Then some optimizations to this system were made including selecting optimum enzyme building blocks and improving expression parameters. Read More