Recent Advances In Selection Research Articles

A Brief Review on Additive Manufacturing Processes for Lightweight Metal Matrix Composites

Many additive manufacturing (AM) processes have been developed to fabricate lightweight metal matrix composites (LMMCs) from constituent materials. However, the improvement in mechanical properties is significantly affected by the added reinforcing materials in the LMMC compared to metallic materials and their alloys. Recent advances in understanding the selecting criteria and effect of the reinforcement, preparation methods and AM process on the properties of LMMCs are summarised in this review. The preparation methods of particle-reinforced LMMCs include ex situ and in situ synthesis. The effect of various reinforcement and AM processes such as powder bed fusion (PBF) processes and direct energy deposition (DED) processes on the mechanical properties of LMMC parts are discussed.

RECENTES AVANÇOS NA FUNCIONALIZAÇÃO SELETIVA DE QUINOLINAS

RECENT ADVANCES IN SELECTIVE FUNCTIONALIZATION OF QUINOLINES. Heterocyclic compounds form an important and extensive group of organic substances. Among nitrogenous heterocyclic molecules, quinolines stand out for exhibiting attractive chemical and biological properties. These substances can be used as ligands, sensors, luminescent and agrochemical materials. In addition, quinoline-containing compounds can exhibit a wide spectrum of pharmacological properties, allowing their use in several approved drugs nowadays. Due to its importance, the synthesis of molecules containing this nucleus becomes a point of interest for synthetic chemists. In this way, several methodologies have been recently developed to prepare quinoline derivatives with high structural diversity. Such chemical transformations allow the chemical modification of these rings with high selectivity and tolerance to diverse functional groups and these properties have been conveniently used in the preparation of biologically active molecules containing this unit. Herein, we present a review of the main methodologies employed in the selective functionalization of quinolines in the last twenty years. In this context, a brief introduction addressing general synthetic and medicinal aspects related to the functionalization positions of the quinoline ring is presented. Several methodologies used in the functionalization of this moiety are discussed, as well relevant synthetic applications, both in the preparation and functionalization of substances of biological interest.

Advances in heavy metal removal by sulfate-reducing bacteria.

Industrial development has led to generation of large volumes of wastewater containing heavy metals, which need to be removed before the wastewater is released into the environment. Chemical and electrochemical methods are traditionally applied to treat this type of wastewater. These conventional methods have several shortcomings, such as secondary pollution and cost. Bioprocesses are gradually gaining popularity because of their high selectivities, low costs, and reduced environmental pollution. Removal of heavy metals by sulfate-reducing bacteria (SRB) is an economical and effective alternative to conventional methods. The limitations of and advances in SRB activity have not been comprehensively reviewed. In this paper, recent advances from laboratory studies in heavy metal removal by SRB were reported. Firstly, the mechanism of heavy metal removal by SRB is introduced. Then, the factors affecting microbial activity and metal removal efficiency are elucidated and discussed in detail. In addition, recent advances in selection of an electron donor, enhancement of SRB activity, and improvement of SRB tolerance to heavy metals are reviewed. Furthermore, key points for future studies of the SRB process are proposed.

ChemInform Abstract: A SURVEY OF RECENT ADVANCES IN SELECTIVE CHEMICAL AND ENZYMIC POLYSACCHARIDE MODIFICATIONS

Chemischer InformationsdienstVolume 16, Issue 46 Reviews ChemInform Abstract: A SURVEY OF RECENT ADVANCES IN SELECTIVE CHEMICAL AND ENZYMIC POLYSACCHARIDE MODIFICATIONS M. YALPANI, M. YALPANISearch for more papers by this author M. YALPANI, M. YALPANISearch for more papers by this author First published: November 19, 1985 https://doi.org/10.1002/chin.198546335AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume16, Issue46November 19, 1985 RelatedInformation