28,518 results match your criteria elemental analysis

A two-year assessment of particulate air pollution and sources in Kuwait.

Environ Pollut 2021 Mar 31;282:117016. Epub 2021 Mar 31.

Environmental Health Department, Harvard T.H. Chan School of Public Health, Harvard University, Boston, MA, United States.

Background: Kuwait and the Gulf region have a desert, hyper-arid and hot climate that makes outdoor air sampling challenging. The region is also affected by intense dust storms. Monitoring challenges from the harsh climate have limited data needed to inform appropriate regulatory actions to address air pollution in the region. Read More

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Fabrication and evaluation of porous and conductive nanofibrous scaffolds for nerve tissue engineering.

J Mater Sci Mater Med 2021 Apr 13;32(4):46. Epub 2021 Apr 13.

Pediatric Urology and Regenerative Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran.

Peripheral nerve repair is still one of the major clinical challenges which has received a great deal of attention. Nerve tissue engineering is a novel treatment approach that provides a permissive environment for neural cells to overcome the constraints of repair. Conductivity and interconnected porosity are two required characteristics for a scaffold to be effective in nerve regeneration. Read More

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Arylarsonate- and Phosphonate-Capped Polyoxomolybdates, [(RCHAs)MoO] and [(R'CHP)MoO].

Inorg Chem 2021 Apr 13. Epub 2021 Apr 13.

Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, Bremen 28759, Germany.

We report on the synthesis and structural characterization of four arylarsonate- and phosphonate-capped polyoxomolybdates that exhibit different organic substituents in the para position of the phenyl group. The reaction of arylarsonates (RAsO, wherein R = 4-BrCH or 4-NCH) with molybdate in aqueous pH 3.5 media resulted in the cyclic hexamolybdates [(BrCHAs)MoO] () and [(NCHAs)MoO] (), whereas the reaction of arylphosphonates (R'PO, wherein R' = 4-OCCH or 4-OCCHCH) with molybdate in aqueous pH 3 media resulted in the cyclic pentamolybdates [(OCCHP)MoO] () and [(HOCCHCHP)MoO] (), respectively. Read More

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Synthesis, antimicrobial activity, density functional modelling and molecular docking with COVID-19 main protease studies of benzoxazole derivative: 2-(p-chloro-benzyl)-5-[3-(4-ethly-1-piperazynl) propionamido]-benzoxazole.

J Mol Struct 2021 Apr 8:130413. Epub 2021 Apr 8.

Department of Pharmaceutical Microbiology, Faculty of Pharmacy, Trakya University TR-22030 Edirne, Turkey.

This study contains synthesis, antimicrobial activity, density functional modelling and molecular docking studies of benzoxazole derivative: 2-(p-chloro-benzyl)-5-[3-(4-ethly-1-piperazynl) propionamido]-benzoxazole. The synthetic procedure of investigated compound is given in detail. The newly synthesized benzoxazole compound and standard drugs were evaluated for their antimicrobial activity against some Gram-positive, Gram-negative bacteria and fungus and their drug-resistant isolates. Read More

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Hexaferrocenium tri[hexa(isothiocyanato)iron(III)] trihydroxonium complex as a new DNA intercalator for electrochemical DNA biosensor.

Sci Rep 2021 Apr 12;11(1):7883. Epub 2021 Apr 12.

Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia (UKM), 43600, Bangi, Selangor Darul Ehsan, Malaysia.

Ferrocene or ferrocenium has been widely studied in the field of organometallic complexes because of its stable thermodynamic, kinetic and redox properties. Novel hexaferrocenium tri[hexa(isothiocyanato)iron(III)]trihydroxonium (HexaFc) complex was the product from the reaction of ferrocene, maleic acid and ammonium thiocyanate and was confirmed by elemental analysis CHNS, FTIR and single crystal X-ray crystallography. In this study, HexaFc was used for the first time as an electroactive indicator for porcine DNA biosensor. Read More

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Long-Term Exposure to Fine Particle Elemental Components and Natural and Cause-Specific Mortality-a Pooled Analysis of Eight European Cohorts within the ELAPSE Project.

Environ Health Perspect 2021 Apr 12;129(4):47009. Epub 2021 Apr 12.

Institute for Risk Assessment Sciences, Utrecht University, Utrecht, Netherlands.

Background: Inconsistent associations between long-term exposure to particles with an aerodynamic diameter [fine particulate matter ()] components and mortality have been reported, partly related to challenges in exposure assessment.

Objectives: We investigated the associations between long-term exposure to elemental components and mortality in a large pooled European cohort; to compare health effects of components estimated with two exposure modeling approaches, namely, supervised linear regression (SLR) and random forest (RF) algorithms.

Methods: We pooled data from eight European cohorts with 323,782 participants, average age 49 y at baseline (1985-2005). Read More

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Determination of metals in children's plastic toys using X-ray florescence spectroscopy.

Environ Sci Pollut Res Int 2021 Apr 12. Epub 2021 Apr 12.

Department of Environmental Health, College of Health Sciences, University of Sharjah, Sharjah, United Arab Emirates.

Children's toys may contain substances that children can be exposed to via multiple pathways. The aim of this study was to assess the presence of metals in children's plastic toys using X-ray florescence. Fifty-six children's plastic toys were purchased from several wholesale markets, supermarkets, and retail stores in the UAE, and fifty-four out of them were labeled "Made in China. Read More

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Synthesis, crystal growth, characterization and DFT investigation of a nonlinear optically active cuminaldehyde derivative hydrazone.

Acta Crystallogr B Struct Sci Cryst Eng Mater 2021 Apr 17;77(Pt 2):249-259. Epub 2021 Mar 17.

School of Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, People's Republic of China.

Single crystals of (E)-N'-(4-isopropylbenzylidene)isonicotinohydrazide monohydrate (IBIHM) were grown from ethanol by the slow evaporation from solution growth technique at room temperature. The structure was elucidated by single-crystal X-ray diffraction analysis and crystallized in the orthorhombic system with noncentrosymmetric space group P222. Optical studies reveal that the absorption was minimum in the visible region and the band-gap energy was estimated using the Kubelka-Munk algorithm. Read More

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Boronic Acid Functionalized Nanosilica for Binding Guest Molecules.

ACS Appl Nano Mater 2021 Mar 19;4(3):2866-2875. Epub 2021 Feb 19.

Division of Pure and Applied Biochemistry, Department of Chemistry, Lund University, Box 124, 22100 Lund, Sweden.

Dendritic fibrous nanosilica (DFNS) has very high surface area and well-defined nanochannels; therefore, it is very useful as supporting material for numerous applications including catalysis, sensing, and bioseparation. Due to the highly restricted space, addition of molecular ligands to DFNS is very challenging. This work studies how ligand conjugation in nanoscale pores in DFNS can be achieved through copper-catalyzed click reaction, using an optional, in situ synthesized, temperature-responsive polymer intermediate. Read More

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Design, Synthesis, and Antifungal Activity of Novel Longifolene-Derived Diacylhydrazine Compounds.

ACS Omega 2021 Apr 24;6(13):9104-9111. Epub 2021 Mar 24.

Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, Guangxi University for Nationalities, No. 188, Daxue Dong Road, Nanning, Guangxi 530006, China.

Succinate dehydrogenase (SDH) present in the inner mitochondrial membrane is an important target enzyme for the design of SDH inhibitor-type fungicides. Using SDH as the target enzyme, 22 novel longifolene-derived diacylhydrazine compounds were designed and synthesized using the renewable natural product longifolene as the starting material. Their structures were confirmed by IR, H NMR, C NMR, electrospray mass spectrometry, and elemental analysis. Read More

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Synthesis, microstructural characterization and nanoindentation of Zr, Zr-nitride and Zr-carbonitride coatings deposited using magnetron sputtering.

Anwar Ul-Hamid

J Adv Res 2021 Mar 25;29:107-119. Epub 2020 Nov 25.

Center for Engineering Research, Research Institute, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.

Introduction: Hard coatings are primarily based on carbides, nitrides and carbonitrides of transition metal elements such as W, Ti, Zr, etc. Zr-based hard coatings show good resistance to wear, erosion, and corrosion as well as exhibit high hardness, high temperature stability, and biocompatibility, making them suitable candidates for tribological, biomedical, and electrical applications.

Objectives: The present study aims to synthesize uniform and adherent hard Zr-based coatings that demonstrate sound mechanical integrity. Read More

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