1,509,877 results match your criteria Chemical & Engineering News[Journal]


Efficacy and Safety Results of Micellar Water, Cream and Serum for Rosacea in comparison to a control group.

J Cosmet Dermatol 2020 Jul 5. Epub 2020 Jul 5.

Department of Dermatology and Allergy, University Hospital of Munich, LMU, Munich, Germany.

Background: Rosacea is a common inflammatory skin disorder with centrofacial erythema, flushing, telangiectasia, papules/pustules and possible ocular or phymatous manifestation. Patients' skin is particularly sensitive to chemical and physical stimuli leading to burning, stinging, dryness and skin tightness.

Objective: Dermatological evaluation of the efficacy and safety of skin care products designed for centrofacial erythema in rosacea patients, in comparison to a control group using objective measurements. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1111/jocd.13591DOI Listing

Pre-treatment with D942, a furancarboxylic acid derivative, increases desiccation tolerance in an anhydrobiotic tardigrade Hypsibius exemplaris.

FEBS Open Bio 2020 Jul 4. Epub 2020 Jul 4.

Institute for Advanced Biosciences, Keio University, 997-0052, Tsuruoka, Yamagata, Japan.

The tardigrade Hypsibius exemplaris can undergo anhydrobiosis. Several chemicals that inhibit successful anhydrobiosis in H. exemplaris have been identified, and these chemicals inhibit the activity of signaling molecules. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/2211-5463.12926DOI Listing

Chemical composition and antimicrobial activity of cuticular and internal lipids of the insect Rhynchophorus palmarum.

Arch Insect Biochem Physiol 2020 Jul 5:e21723. Epub 2020 Jul 5.

Institute of Pharmaceutical Sciences, Federal University of Alagoas, Maceió, Alagoas, Brazil.

Insect cuticle lipids are involved in various types of chemical communication between species, and reduce the penetration of insecticides, chemicals, and toxins, as well as provide protection against the attack of microorganisms, parasitic insects, and predators. Ecological studies related to the insect Rhynchophorus palmarum are well-known; however, very little is known about its resistance mechanisms, which includes its lipid composition and its importance, specifically the cuticle layer. This study aimed to characterize the cuticle and internal lipid compounds of the male and female R. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/arch.21723DOI Listing

Gestational bisphenol A exposure induces fatty liver development in male offspring mice through the inhibition of HNF1b and upregulation of PPARγ.

Cell Biol Toxicol 2020 Jul 4. Epub 2020 Jul 4.

Department of Toxicology, Shaanxi Key Lab of Free Radical Biology and Medicine, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Public Health, Air Force Medical University (Fourth Military Medical University), Changle West Road 169, Xi'an, 710032, Shaanxi Province, China.

Bisphenol A (BPA) is an endocrine-disrupting chemical (EDC) associated with non-alcoholic fatty liver disease (NAFLD). The effects of gestational BPA exposure on hepatic lipid accumulation in offspring are not fully understood. Here, we investigate the sex-dependent effects of gestational BPA exposure on hepatic lipid and glucose metabolism in the offspring of mice to reveal the mechanisms underlying gestational BPA exposure-associated NAFLD. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s10565-020-09535-3DOI Listing

Spatial-temporal variability of aerosol sources based on chemical composition and particle number size distributions in an urban settlement influenced by metallurgical industry.

Environ Sci Pollut Res Int 2020 Jul 5. Epub 2020 Jul 5.

Department of Public Health Sciences, University of Rochester Medical Center, 265 Crittenden Boulevard, Rochester, NY, 14642-0708, USA.

The Moravian-Silesian region of the Czech Republic with its capital city Ostrava is a European air pollution hot spot for airborne particulate matter (PM). Therefore, the spatiotemporal variability assessment of source contributions to aerosol particles is essential for the successful abatement strategies implementation. Positive Matrix Factorization (PMF) was applied to highly-time resolved PM chemical composition (1 h resolution) and particle number size distribution (PNSD, 14 nm - 10 μm) data measured at the suburban (Ostrava-Plesná) and urban (Ostrava-Radvanice) residential receptor sites in parallel during an intensive winter campaign. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s11356-020-09694-0DOI Listing

High crosslinked sodium carboxyl methylstarch-g-poly (acrylic acid-co-acrylamide) resin for heavy metal adsorption: its characteristics and mechanisms.

Environ Sci Pollut Res Int 2020 Jul 5. Epub 2020 Jul 5.

College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, People's Republic of China.

A lower expansive heavy metal adsorbent, high crosslinked sodium carboxyl methylstarch-g-poly (acrylic acid-co-acrylamide) resin (HCAA), has been prepared by enhancing the crosslinking degree of the traditional water-absorbing polymer under the graft copolymerization reaction. Further heavy metal adsorption experiments, morphology analysis, and structure characteristic observations indicate that HCAA resin has an excellent heavy metal adsorption properties for Cr, Cu, Ni, and Zn of 80.08, 158. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s11356-020-09945-0DOI Listing

Functional wastepaper-montmorillonite composite aerogel for Cd adsorption.

Environ Sci Pollut Res Int 2020 Jul 5. Epub 2020 Jul 5.

College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.

In this study, a composite aerogel (WP-MMT) composed of wastepaper (WP) and montmorillonite (MMT) was prepared by ambient pressure drying technology to adsorb Cd. The study of compression performance indicated that the composite aerogel had ideal mechanical strength when the mass ratio of WP to MMT was 1:1. The specific surface areas of the aerogels modified by hydrogen peroxide (WP-MMT-HO) and sodium hydroxide (WP-MMT-NaOH) were increased greatly. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s11356-020-09907-6DOI Listing

Stable nitrogen isotopes in octocorals as an indicator of water quality decline from the northwestern region of Cuba.

Environ Sci Pollut Res Int 2020 Jul 4. Epub 2020 Jul 4.

Centro de Investigaciones Marinas, Universidad de La Habana, Calle 16 No. 114, Playa, CP 11300, Havana, Cuba.

Eutrophication is one of the causes of the degradation of reefs worldwide. The aim of this research is to determine if sewage discharge reaches the fore reefs at northwest of Cuba using δN in tissues of the octocorals Eunicea flexuosa and Plexaura kuekenthali and the concentration of microbiological and physical-chemical variables. Thirteen reefs at 10-m depth were selected near river basins and far from the urban and industrial development of Havana City. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s11356-020-09956-xDOI Listing

Synthetic biology, systems biology, and metabolic engineering of Yarrowia lipolytica toward a sustainable biorefinery platform.

J Ind Microbiol Biotechnol 2020 Jul 4. Epub 2020 Jul 4.

Department of Chemical, Biochemical and Environmental Engineering, University of Maryland, Baltimore County, Baltimore, MD, 21250, USA.

Yarrowia lipolytica is an oleaginous yeast that has been substantially engineered for production of oleochemicals and drop-in transportation fuels. The unique acetyl-CoA/malonyl-CoA supply mode along with the versatile carbon-utilization pathways makes this yeast a superior host to upgrade low-value carbons into high-value secondary metabolites and fatty acid-based chemicals. The expanded synthetic biology toolkits enabled us to explore a large portfolio of specialized metabolism beyond fatty acids and lipid-based chemicals. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s10295-020-02290-8DOI Listing

Gut microbiota and undigested food constituents modify toxin composition and suppress the genotoxicity of a naturally occurring mixture of Alternaria toxins in vitro.

Arch Toxicol 2020 Jul 4. Epub 2020 Jul 4.

Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währinger Str. 42, 1090, Vienna, Austria.

Molds of the genus Alternaria produce several mycotoxins, some of which may pose a threat for health due to their genotoxicity. Due to the lack of adequate toxicological and occurrence data, they are currently not regulated. Interactions between mycotoxins, gut microbiota and food constituents might occur after food ingestion, modifying the bioavailability and, therefore, overall toxicity of mycotoxins. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s00204-020-02831-1DOI Listing

β-Cyclodextrin coated porous Pd@Au nanostructures with enhanced peroxidase-like activity for colorimetric and paper-based determination of glucose.

Mikrochim Acta 2020 Jul 4;187(8):425. Epub 2020 Jul 4.

Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui, 230009, People's Republic of China.

β-cyclodextrin-functionalized porous Pd@Au nanostructures (β-CD-Pd@Au) with intrinsic and enhanced peroxidase-like activity were successfully synthesized by a two-step method. The synthesized β-CD-Pd@Au can efficiently catalyze the oxidation of various substrates, such as 3,3',5,5'-tetramethylbenzidine (TMB), mixture of 4-amino antipyrine (4-AAP) and 3,5-dichloro-2-hydroxy acid sodium (DHBS) (4-AAP/DHBS), and mixture of 4-AAP and N-Ethyl-N-(3-sulfopropyl)-3-methyl-aniline sodium salt (TOPS) (4-AAP/TOPS), by HO to generate visual blue, purple, and pink color, respectively. The UV-vis absorbance peak of the three β-CD-Pd@Au catalyzed the chromogenic reaction system located at 650 nm, 510 nm, and 550 nm, respectively. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s00604-020-04410-8DOI Listing

Extrahepatic metabolism of ibrutinib.

Invest New Drugs 2020 Jul 4. Epub 2020 Jul 4.

Division of Pharmacoepidemiology & Clinical Pharmacology, Faculty of Science, Department of Pharmaceutical Sciences, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands.

Ibrutinib is a first-in-class Bruton's kinase inhibitor used in the treatment of multiple lymphomas. In addition to CYP3A4-mediated metabolism, glutathione conjugation can be observed. Subsequently, metabolism of the conjugates and finally their excretion in feces and urine occurs. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s10637-020-00970-xDOI Listing

Correction to: Ultra-thin nanosheet-assembled accordion-like Ni-MOF for hydrazine hydrate amperometric sensing.

Mikrochim Acta 2020 Jul 4;187(8):426. Epub 2020 Jul 4.

School of Chemistry and Chemical Engineering, Institute for Innovative Materials and Energy, Yangzhou University, Yangzhou, Yangzhou, 225002, Jiangsu, People's Republic of China.

The published article is revised due to diagram errors. The authors express their sincere apology, and corrected Figure 2a (XPS), Figure S4 (IR), and Figure S7 (XPS) are given. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s00604-020-04388-3DOI Listing

Protein structure analysis of the interactions between SARS-CoV-2 spike protein and the human ACE2 receptor: from conformational changes to novel neutralizing antibodies.

Cell Mol Life Sci 2020 Jul 4. Epub 2020 Jul 4.

Laboratory of Biochemistry, Molecular and Structural Biology, Department of Biosciences, Biotechnologies, Biopharmaceutics, University of Bari, Via E. Orabona, 4, 70125, Bari, Italy.

The recent severe acute respiratory syndrome, known as Coronavirus Disease 2019 (COVID-19) has spread so much rapidly and severely to induce World Health Organization (WHO) to declare a state of emergency over the new coronavirus SARS-CoV-2 pandemic. While several countries have chosen the almost complete lock-down for slowing down SARS-CoV-2 spread, the scientific community is called to respond to the devastating outbreak by identifying new tools for diagnosis and treatment of the dangerous COVID-19. With this aim, we performed an in silico comparative modeling analysis, which allows gaining new insights into the main conformational changes occurring in the SARS-CoV-2 spike protein, at the level of the receptor-binding domain (RBD), along interactions with human cells angiotensin-converting enzyme 2 (ACE2) receptor, that favor human cell invasion. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s00018-020-03580-1DOI Listing

Susceptibility of tick-borne encephalitis virus to inactivation by heat, acidic pH, chemical or UV treatment.

J Infect Dis 2020 Jul 5. Epub 2020 Jul 5.

Institute for Physiological Chemistry and Research Center for Emerging Infections and Zoonoses, University of Veterinary Medicine Hannover, Hannover, Germany.

Tick-borne encephalitis virus (TBEV) is a single-stranded, positive-sense RNA virus in the family Flaviviridae that is endemic in parts of Europe and Asia and can cause meningitis or encephalitis. Due to the disease severity, TBEV requires handling under heightened biosafety measures. The establishment and validation of inactivation procedures is a prerequisite for downstream analyses and management of occupational exposure. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1093/infdis/jiaa405DOI Listing

Effect of ultrasonication on the flotation of fine graphite particles: Nanobubbles or not?

Ultrason Sonochem 2020 Jun 30;69:105243. Epub 2020 Jun 30.

National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China. Electronic address:

It has been reported that nanobubbles can be produced by ultrasonication. However, it remains unclear whether part of the contribution of ultrasonication on flotation performance can be attributed to the generation of nanobubbles. In this work, we systematically studied this point of ultrasonication by combining a series of techniques including flotation testing, AFM (atomic force microscope) measurement, and settling testing. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.ultsonch.2020.105243DOI Listing

Interaction of RSC Chromatin Remodeling Complex with Nucleosomes Is Modulated by H3 K14 Acetylation and H2B SUMOylation In Vivo.

iScience 2020 Jun 20;23(7):101292. Epub 2020 Jun 20.

Department of Structural Biochemistry, Max-Planck-Institute of Molecular Physiology, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany; Department of Chemical Engineering and Biotechnology, University of Applied Sciences Darmstadt, Stephanstrasse 7, 64295 Darmstadt, Germany. Electronic address:

Chromatin remodeling complexes are multi-subunit nucleosome translocases that reorganize chromatin in the context of DNA replication, repair, and transcription. To understand how these complexes find their target sites on chromatin, we use genetically encoded photo-cross-linker amino acids to map the footprint of Sth1, the catalytic subunit of the RSC complex, on nucleosomes in living yeast. We find that H3 K14 acetylation induces the interaction of the Sth1 bromodomain with the H3 tail and mediates the interaction of RSC with neighboring nucleosomes rather than recruiting it to chromatin. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.isci.2020.101292DOI Listing

Efficient Photoelectron Capture by Ni Decoration in Methanosarcina barkeri-CdS Biohybrids for Enhanced Photocatalytic CO-to-CH Conversion.

iScience 2020 Jun 20;23(7):101287. Epub 2020 Jun 20.

Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA.

Semi-artificial photosynthesis (biohybrid) provides an intriguing opportunity for efficient CO-to-CH conversion. However, creating a desirable semiconductor in biohybrids remains a great challenge. Here, by doping Ni into CdS nanoparticles, we have successfully developed the Methanosarcina barkeri-Ni:CdS biohybrids. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.isci.2020.101287DOI Listing

Mucoadhesive interactions between synthetic polyaspartamides and porcine gastric mucin on the colloid size scale.

Colloids Surf B Biointerfaces 2020 Jun 24;194:111219. Epub 2020 Jun 24.

Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary. Electronic address:

Synthetic polyaspartamides with various functional side groups including primary, secondary, tertiary amine or carboxyl groups were designed to explore the effect of chemical composition on polymer-mucin interactions. Since the molecular weight of the polymers and the degree of modification were identical for each derivative, the role of the functional groups could be evaluated. Chitosan was used as a control sample due to its strong interaction with mucin primarily through electrostatic forces. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.colsurfb.2020.111219DOI Listing

Chiral differentiation of l- and d-penicillamine by β-cyclodextrin: Investigated by IRMPD spectroscopy and theoretical simulations.

Spectrochim Acta A Mol Biomol Spectrosc 2020 Jun 26;241:118653. Epub 2020 Jun 26.

State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China; Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 30007, China. Electronic address:

The chirality of penicillamine (Peni) results in different clinic applications. Host-guest complex based drug delivery system that differentiates the two enantiomers and provides delayed release is of significance in medication. We hereby used β-CD to encapsulate d- and l-Peni. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.saa.2020.118653DOI Listing

Multi-mode fluorescence sensing detection based on one core-shell structure quantum dots via different types of mechanisms.

Spectrochim Acta A Mol Biomol Spectrosc 2020 Jun 19;241:118630. Epub 2020 Jun 19.

Research Center for Analytical Science, State Key Laboratory of Medicinal Chemical Biology and Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, China.

Multi-target sensing completed with single chemosensor is cost-effective and pretty attractive for the analysis of multiple analytes in single sample. CdTe/CdS QDs show high fluorescence quantum yield as a probe for the sensing purpose, but only single target is often detected. Here we proposed that three kinds of different response mechanisms were realized using CdTe/CdS QDs with the simultaneous sensing of Fe, CrO, and IO as model. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.saa.2020.118630DOI Listing

In vitro temperature sensing with up-conversion NaYF:Yb/Tm-based nanocomposites: Peculiarities and pitfalls.

Spectrochim Acta A Mol Biomol Spectrosc 2020 Jun 19;241:118627. Epub 2020 Jun 19.

Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia.

The luminescence intensity ratio method, exploiting the temperature-dependent luminescence of the thermally coupled energy levels, is regarded as a very promising approach for optical temperature measurement at the cellular level. In this study, it was found that bare NaYF:Yb/Tm nanoparticles cannot be used as a cellular thermosensor in principle because of their tendency to aggregate, which significantly affects the luminescent properties of the complex, introducing uncertainty in the intensity ratio measurement. NaYF:Yb/Tm up-conversion nanoparticles, coated with polyethylene glycol (PEG) and carboxyl groups (COOH), on the other hand, proved to be promising candidates for the role of thermosensors. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.saa.2020.118627DOI Listing

Recycling application of waste long-root Eichhornia crassipes in the heavy metal removal using oxidized biochar derived as adsorbents.

Bioresour Technol 2020 Jun 27;314:123749. Epub 2020 Jun 27.

National Engineering Research Center for Integrated Utilization of Salt Lake Resources, East China University of Science and Technology, Shanghai 200237, China; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.

An oxidized biochar was prepared using long-root Eichhornia crassipes through an aerobic/anaerobic hybrid calcination to recycle its waste plants after eutrophic treatments. The adsorption performances of the biochar were investigated and the results showed that the adsorption equilibrium could arrive in 30 min and the adsorption capacities for Pb, Cu, Cd and Zn at 30 °C were 0.57, 0. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.biortech.2020.123749DOI Listing

Evaluating responses of nitrification and denitrification to the co-selective pressure of divalent zinc and tetracycline based on resistance genes changes.

Bioresour Technol 2020 Jun 30;314:123769. Epub 2020 Jun 30.

Liaoning Provincial Ecology and Environment Protection Science and Technology Center, Shenyang, China.

The responses of nitrification and denitrification to the divalent zinc (Zn(II)) and tetracycline (TC) co-selective pressure were evaluated in a sequencing batch reactor (SBR). The removal rates of organics and nitrogen, nitrifying and denitrifying enzymatic activity, and microbial diversity and richness at the Zn(II) and TC co-selective pressure were higher than those at the alone Zn(II) selective pressure, while were lower than those at the individual TC selective pressure. The Zn(II) and TC co-selective pressure induced the TC resistance genes abundance increase and the Zn(II) resistance genes levels decrease, and enhanced bacterial enzymatic modification resistance to TC and bacterial outer membrane resistance to Zn(II). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.biortech.2020.123769DOI Listing

Characteristics of effluents from trout farms and their impact on water quality and benthic algal assemblages of the receiving stream.

Environ Pollut 2020 Jun 29;266(Pt 1):115101. Epub 2020 Jun 29.

DSI IX. Regional Directorate, Keban Dam Fisheries Division, Elazığ, Turkey.

In this study, characteristics of effluents from three flow-through rainbow trout farms in Turkey and their impact on water quality and epilithic algal communities of the receiving stream were investigated. Water samples were taken monthly from both inlets and outlets of three fish farms, while both water and epilithic algae samples were collected from two stations (upstream and downstream) in the stream. A significant increase from inlets to outlets was observed for chemical oxygen demand (COD), soluble reactive phosphorus (SRP), total suspended solids (TSS), NH-N and total phosphorus (TP) (p < 0. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.envpol.2020.115101DOI Listing

Automated mineralogy for quantification and partitioning of metal(loid)s in particulates from mining/smelting-polluted soils.

Environ Pollut 2020 Jul 1;266(Pt 1):115118. Epub 2020 Jul 1.

Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov 6, 128 00, Prague 2, Czech Republic. Electronic address:

Topsoils near active and abandoned mining and smelting sites are highly polluted by metal(loid) contaminants, which are often bound to particulates emitted from ore processing facilities and/or windblown from waste disposal sites. To quantitatively determine the contaminant partitioning in the soil particulates, we tested an automated mineralogy approach on the heavy mineral fraction extracted from the mining- and smelting-polluted topsoils exhibiting up to 1920 mg/kg As, 5840 mg/kg Cu, 4880 mg/kg Pb and 3310 mg/kg Zn. A new generation of automated scanning electron microscopy (autoSEM) was combined and optimized with conventional mineralogical techniques (XRD, SEM/EDS, EPMA). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.envpol.2020.115118DOI Listing

Simultaneous determination of seven perfluoroalkyl carboxylic acids in water samples by 2,3,4,5,6-pentafluorobenzyl bromide derivatization and gas chromatography-mass spectrometry.

Environ Pollut 2020 Jun 21;266(Pt 3):115043. Epub 2020 Jun 21.

Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, 066004, PR China. Electronic address:

A new derivatization reagent, 2,3,4,5,6-pentafluorobenzyl bromide (PFBBr), was employed to determine seven perfluoroalkyl carboxylic acids (PFCAs) simultaneously in tap water with gas chromatography-mass spectrometry (GC-MS) technique in this study. Firstly, seven PFCAs were derivatized to their corresponding esters under alkaline condition. The derivatization conditions including the amount of PFBBr and KCO, derivatization temperature and time were optimized to increase the derivatization efficiency. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.envpol.2020.115043DOI Listing

Field test of electrokinetically-delivered thermally activated persulfate for remediation of chlorinated solvents in clay.

Water Res 2020 Jun 20;183:116061. Epub 2020 Jun 20.

School of Civil and Environmental Engineering, Water Research Centre, University of New South Wales, Sydney, NSW, 2052, Australia. Electronic address:

In situ chemical oxidation (ISCO) has demonstrated success in remediating soil and groundwater contaminated with chlorinated volatile organic compounds (CVOCs). However, its performance is often hindered in low-permeability or heterogeneous media due to an inability to effectively deliver the oxidants. This field-scale study investigated the novel approach of applying electrokinetics (EK) to enhance the delivery of persulfate in a low-permeability media and the ability of electrical resistance heating (ERH) to thermally activate the delivered persulfate. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.watres.2020.116061DOI Listing

Exploring the inhibition boundaries of mixed cultures of purple phototrophic bacteria for wastewater treatment in anaerobic conditions.

Water Res 2020 Jun 20;183:116057. Epub 2020 Jun 20.

Department of Chemical and Environmental Engineering, University Rey Juan Carlos, Móstoles, Madrid, Spain.

The development of novel wastewater platforms should include the analysis of the most critical functional factors including the effects of toxic or inhibitory substances. Due to the novelty of purple phototrophic bacteria (PPB)-based wastewater treatment systems, this analysis has not been done yet in mixed cultures. In this work, various relevant chemical compounds, including aromatic (phenol, 2,4,6-trichlorophenol or 246TCP, 4-nitrophenol or 4CP, sulfathiazole) and aliphatic organics (methanol, trichlorethylene or TCE, oleic acid, ethanol, propionic acid), inorganic salts (ammonium, ClO, Na), and metals (Fe, Fe, Cu, Zn, Ni, Al), as well as pH, are analyzed for their effect on mixed PPB cultures in anaerobic photoheterotrophic conditions using acetate as the model organic substrate. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.watres.2020.116057DOI Listing

Barium isotopic fractionation during strong weathering of basalt in a tropical climate.

Environ Int 2020 Jul 2;143:105896. Epub 2020 Jul 2.

CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, Anhui 230026, China. Electronic address:

Barium (Ba) is an element which is toxic to humans, plants, and animals. Deciphering the geochemical behavior of Ba in soils is fundamental for assessing the potentials risks posed by Ba. Ba isotopes are a potentially robust tracer of Ba in soils. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.envint.2020.105896DOI Listing

Nitrogen-deficient g-CN/POMs porous nanosheets with P-N heterojunctions capable of the efficient photocatalytic degradation of ciprofloxacin.

Chemosphere 2020 Jun 20;259:127465. Epub 2020 Jun 20.

College of Science, Central South University of Forestry and Technology, Changsha, 410004, PR China. Electronic address:

The direct shedding of piperazine rings is critical for the degradation of antibiotic persistent organic pollutants. In this work, nitrogen-deficient g-CN loaded with polyoxometalates porous photocatalysts with P-N heterojunctions were carried out through the formation of chemical bonds between the nitrogen-deficient C in g-CN and the bridging oxygen in polyoxometalates (POMs), including phosphomolybdic acid (PMA), phosphotungstic acid (PTA) and silicotungstic acid (STA). The adsorption and photocatalysis experiments confirm the ability of the g-CN/POMs nanosheets to efficiently remove ciprofloxacin via the synergistic effects of adsorption and photo-catalysis. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.chemosphere.2020.127465DOI Listing

Gut-on-a-chip: Current progress and future opportunities.

Biomaterials 2020 Jun 14;255:120196. Epub 2020 Jun 14.

Center for Minimally Invasive Therapeutics (C-MIT), University of California, Los Angeles, CA, USA; Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, CA, USA; Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, CA, USA; Department of Chemical and Biomolecular Engineering, Samueli School of Engineering, University of California, Los Angeles, CA, USA; Terasaki Institute for Biomedical Innovation, Los Angeles, CA, USA. Electronic address:

Organ-on-a-chip technology tries to mimic the complexity of native tissues in vitro. Important progress has recently been made in using this technology to study the gut with and without microbiota. These in vitro models can serve as an alternative to animal models for studying physiology, pathology, and pharmacology. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.biomaterials.2020.120196DOI Listing

Multiple strategies for maintaining stable partial nitritation of low-strength ammonia wastewater.

Sci Total Environ 2020 Jun 29;742:140542. Epub 2020 Jun 29.

State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Department of Water Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address:

Stable production of nitrite is an essential technical challenge for mainstream anaerobic ammonia oxidation (Anammox). Due to difficulties in the stable inhibition of nitrite oxidizing bacteria (NOB) and maintenance of long-term partial nitritation (PN), integrated multiple, rather than a single, controlling strategies were preferred especially in a continuous-flow treatment system. A mathematically model was developed to evaluate effects of integrated multiple-strategies on ammonia oxidizing bacteria (AOB) and NOB. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.scitotenv.2020.140542DOI Listing

Toxicological assessment of seven unregulated drinking water Disinfection By-products (DBPs) using the zebrafish embryo bioassay.

Sci Total Environ 2020 Jun 25;742:140522. Epub 2020 Jun 25.

CIMAR/CIIMAR, LA- Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Matosinhos, Portugal; FCUP - Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal. Electronic address:

Disinfection By-products (DBPs) are formed during the chemical treatment of water for human consumption, by the reaction of raw water with chemical agents used in the different steps of the process. Disinfection is one of the most important steps, inactivating pathogens and preventing their regrowth during water distribution. However, it is also involved in DBPs formation due to the use of disinfectant agents, such as chlorine, which reacts with dissolved precursors, such as pharmaceuticals, toxins, pesticides, among others. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.scitotenv.2020.140522DOI Listing

Processing of dissolved organic matter from surface waters to sediment pore waters in a temperate coastal wetland.

Sci Total Environ 2020 Jun 24;742:140491. Epub 2020 Jun 24.

Organic Geochemistry Unit, Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China. Electronic address:

Coastal wetlands are active transitional ecotones between land and ocean, and are considered as hot spots of organic matter processing within the global carbon cycle, which dissolved organic matter (DOM) plays a critical role. In this study, combined use of ultrahigh-resolution mass spectrometry (FT-ICR MS) and complementary optical techniques was conducted to assess the detailed molecular composition of DOM in the temperate Liaohe coastal wetland (LCW), NE China in respect to the differences in DOM composition from surface water to sediment pore water. Significant positive correlations between salinity and dissolved organic carbon (DOC) concentrations were observed in both surface waters and pore waters. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.scitotenv.2020.140491DOI Listing

Kinetics and drainage index in function of pH, in the dewatering of arsenic iron sludge.

Sci Total Environ 2020 Jun 29;742:140251. Epub 2020 Jun 29.

Universidad Politécnica del Estado de Morelos (UPEMOR), Blvd. Paseo Cuauhnáhuac 566, Lomas del Texcal, Jiutepec, Mor. 62574, Mexico.

Water for human consumption containing arsenic from natural and anthropogenic sources is a public health problem worldwide. Therefore, different technologies must be used to remove it from the water (coagulation-filtration assisted with ferric chloride, adsorption, membranes, etc.). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.scitotenv.2020.140251DOI Listing

Influence of titanium and zirconia modified surfaces for rapid healing on adhesion and biofilm formation of Staphylococcus epidermidis.

Arch Oral Biol 2020 Jun 22;117:104824. Epub 2020 Jun 22.

Pontifical Catholic University of Rio Grande Do Sul (PUCRS), School of Health and Life Sciences, Immunology and Microbiology Laboratory, Av. Ipiranga, P.O. Box 6681, 90619-900, Porto Alegre, Brazil.

Objective: Surface alterations have been employed to enhance the osseointegration process in biomedical implants. However, these modifications may influence bacterial adhesion in different ways. Therefore, this study developed five different surfaces and evaluated the Staphylococcus epidermidis growth in early (1 h) and late (24 h) contact. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.archoralbio.2020.104824DOI Listing

Comparison of different types of sorbents for extraction of coumarins.

Food Chem 2020 Jun 27;332:127404. Epub 2020 Jun 27.

Slovak University of Technology in Bratislava, Faculty of Chemical and Food Technology, Institute of Analytical Chemistry, Radlinského 9, 812 37 Bratislava, Slovak Republic.

Coumarins, derivatives of cinnamic acid, are found in wines aged in wooden barrels. The lab-made molecularly imprinted polymers (MIP), selective for simple coumarins, were used in three forms, as sorbents in solid phase extraction (SPE) cartridge or pipette tip and coated on to the surface of magnetite for magnetic extraction. MIP-7-hydroxycoumarin had greater selectivity and extraction efficiency (recoveries above 75%, RSDs less than 6%) compared with conventional SPE sorbents (C18 and styrene-divinylbenzene polymeric types). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.foodchem.2020.127404DOI Listing

Improved permeability and antifouling properties of polyvinyl chloride ultrafiltration membrane via blending sulfonated polysulfone.

J Colloid Interface Sci 2020 Jun 27;579:562-572. Epub 2020 Jun 27.

School of Chemistry and Chemical Engineering, Xinxiang University, Xinxiang 453003, Henan, China; Department of Polymer Science and Engineering, ERC of Membrane and Water Treatment (MOE), Zhejiang University, Hangzhou 310027, Zhejiang, China.

To improve the permeability and antifouling properties of polyvinyl chloride (PVC) ultrafiltration (UF) membrane, amphiphilic sulfonated polysulfone (SPSF) was introduced into PVC matrix. Three types of PVC/SPSF blend membranes containing different SPSF with the sulfonation degree (SD) of 20%, 30%, and 50% were fabricated by non-solvent induced phase separation (NIPS) process. The excellent compatibility between PVC and SPSF was confirmed by differential scanning calorimetry (DSC). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jcis.2020.06.097DOI Listing

Understanding of the role of dilution on evaporative deposition patterns of blood droplets over hydrophilic and hydrophobic substrates.

J Colloid Interface Sci 2020 Jun 12;579:541-550. Epub 2020 Jun 12.

Micro Nano Bio-Fluidics Unit, Dept. of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, India. Electronic address:

Blood is a complex colloidal suspension which carries myriads of information about human health. Understanding the evaporation dynamics and its consequent deposition patterns have direct relevance in disease detection. We report evaporation dynamics of whole and diluted blood droplets over hydrophilic (glass) and hydrophobic (PDMS, polydimethylsiloxane) substrates. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jcis.2020.04.109DOI Listing

A robust stimuli responsive Eu - Metalo organic hydrogel and xerogel emitting white light.

J Colloid Interface Sci 2020 Jun 27;579:531-540. Epub 2020 Jun 27.

Polymer Science Unit, School of Materials Science, Jadavpur, Kolkata 700032, India. Electronic address:

Recently, there is incredible growth on optoelectronic properties of new supramolecular gels and white-light-emitting (WLE) metalo-organic gel comprised with single lanthanide metal ion having stimuli-responsive property is not yet reported. Here, we report a mandelic acid (MA)-triethylene tetraamine (TETA)-Eu-acetate conjugate (4.5:1:0. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jcis.2020.06.078DOI Listing

High performance flexible hybrid supercapacitors based on nickel hydroxide deposited on copper oxide supported by copper foam for a sunlight-powered rechargeable energy storage system.

J Colloid Interface Sci 2020 Jun 25;579:520-530. Epub 2020 Jun 25.

Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, UMR 8520 - IEMN, F-59000 Lille, France. Electronic address:

Herein, an integrated system combining solar cells with a hybrid supercapacitor for operating a homemade windmill device was assembled, achieving energy conversion, storage and utilization. As a candidate for positive electrode of hybrid supercapacitor devices, battery-like Ni(OH)@CuO@Cu binder-free electrode was fabricated by a two-step process at ambient temperature. CuO@Cu was prepared by chemical oxidation method to act as the supporting electrode for electrochemical deposition of Ni(OH). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jcis.2020.06.092DOI Listing

Preparation of low-load Au-Pd alloy decorated carbon fibers binder-free cathode for Li-O battery.

J Colloid Interface Sci 2020 Jun 27;579:448-454. Epub 2020 Jun 27.

School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang City, Henan Province 453007, PR China; National & Local Engineering Laboratory for Motive Power and Key Materials, Xinxiang 453000, PR China. Electronic address:

Developing high-performance cathode is critical to facilitating the development of lithium-oxygen (Li-O) batteries. In this work, a low-load (1.32%) Au-Pd alloy decorated carbon fibers binder-free cathode is prepared by facile magnetron sputtering (MS). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jcis.2020.06.084DOI Listing

Non-viral Gene Delivery of HIF-1α Promotes Angiogenesis in Human Adipose-Derived Stem Cells.

Acta Biomater 2020 Jul 2. Epub 2020 Jul 2.

Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21231, USA; Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD, 21231, USA; Institute for Nanobiotechnology, Johns Hopkins University School of Medicine, Baltimore, MD, 21231, USA; Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, 21231, USA; Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, 21231, USA; Department of Oncology and Bloomberg∼Kimmel Immunotherapy Institute, Johns Hopkins University School of Medicine, Baltimore, MD, 21231, USA; Department of Ophthalmology Johns Hopkins University School of Medicine, Baltimore, MD, 21231, USA. Electronic address:

Stable and mature vascular formation is a current challenge in engineering functional tissues. Transient, non-viral gene delivery presents a unique platform for delivering genetic information to cells for tissue engineering purposes and to restore blood flow to ischemic tissue. The formation of new blood vessels can be induced by upregulation of hypoxia-inducible factor-1α (HIF-1), among other factors. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.actbio.2020.06.042DOI Listing

Association of diabetes and hypertension with disease severity in covid-19 patients: a systematic literature review and exploratory meta-analysis.

Diabetes Res Clin Pract 2020 Jul 2:108295. Epub 2020 Jul 2.

Centre for Translational and Clinical Research, School of Chemical & Life Sciences, Jamia Hamdard, New Delhi-110062, India. Electronic address:

Aim: The novel coronavirus infection (COVID-19), now a worldwide public health concern is associated with varied fatality. Patients with chronic underlying conditions like diabetes and hypertension have shown worst outcomes. The understanding of the association might be helpful in early vigilant monitoring and better management of COVID-19 patients at high risk. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.diabres.2020.108295DOI Listing

Pyruvate metabolism redirection for biological production of commodity chemicals in aerobic fungus Aspergillus oryzae.

Metab Eng 2020 Jul 2. Epub 2020 Jul 2.

Graduate School of Science, Technology, and Innovation, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan; Engineering Biology Research Center, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan; Biomass Engineering Program, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045, Japan. Electronic address:

Pyruvate is a central metabolite for the biological production of various chemicals. In eukaryotes, pyruvate produced by glycolysis is used in conversion to ethanol and lactate and in anabolic metabolism in the cytosol, or is transported into the mitochondria for use as a substrate in the tricarboxylic acid (TCA) cycle. In this study, we focused on controlling pyruvate metabolism in aerobic microorganisms for the biological production of various chemicals. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.ymben.2020.06.010DOI Listing

Solubility of two Polymorphs of Tolbutamide in n-Propanol: Comparison of Methods.

J Pharm Sci 2020 Jul 2. Epub 2020 Jul 2.

Department of Chemical Engineering, KTH Royal Institute of Technology, Teknikringen 42, SE-10044 Stockholm, Sweden. Electronic address:

The solid-liquid solubility of two polymorphs of the title compound has been measured in n-propanol over the temperature range (278 K to 303 K) by an isothermal, gravimetric method and a low heating rate polythermal method. Due to marked differences in the settling behavior of crystals of the two polymorphs in the investigated solvent, it is found that the low heating rate polythermal method gives the overall best performance for this particular system. Systematic slurry conversion experiments show that FII is the stable polymorph over the investigated temperature range (268 K to 308 K). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.xphs.2020.06.022DOI Listing

Concurrent Antisolvent Electrospraying: A Novel Continuous Crystallization Technique.

J Pharm Sci 2020 Jul 2. Epub 2020 Jul 2.

Centre for Advanced Separations Engineering, Department of Chemical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, UK; Centre for Sustainable and Circular Technologies (CSCT), University of Bath, Claverton Down, Bath BA2 7AY, UK; EPSRC Future Continuous Manufacturing and Advanced Crystallisation Research Hub (CMAC), University of Bath, Claverton Down, Bath BA2 7AY, UK. Electronic address:

Pharmaceutical co-crystals (CCs) are multicomponent materials that enable the development of novel therapeutic products by enhancing the properties of active pharmaceutical ingredients, such as solubility, permeability and bioavailability. Currently, CCs are a commercial reality; nonetheless, their industrial production remains a challenge due to problems related to scale up, control and mode of preparation, which usually relies on batch production rather than continuous. This paper describes the implementation of a concurrent coaxial antisolvent electrospray (Co-E), as a new manufacturing technique, for the synthesis of CCs in a rapid, continuous and controlled manner. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.xphs.2020.06.023DOI Listing

Dye/Metal Ion-based chemosensing ensemble towards L-histidine and L-lysine determination in water via different optical responses.

Anal Biochem 2020 Jul 2:113811. Epub 2020 Jul 2.

Department of Chemistry, Payame Noor University, 19395-4697, Tehran, Islamic Republic of Iran. Electronic address:

In this study, a novel simple type of label-free, ultra-sensitive, and highly selective UV-Vis absorption and naked-eye detection of histidine (His) and lysine (Lys) using a dye/metal ion ensemble is developed. The outcoming high sensitivity and selectivity for histidine and lysine were attained by changing the metal ions. The indicator is released due to its displacement from the murexide (Mure)/Cu complex by histidine and the change in absorbance may be due to the further complexation of lysine with the additional coordination sites present in the zinc atom of Mure/Zn complex. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.ab.2020.113811DOI Listing

Maternal chlormequat chloride exposure disrupts embryonic growth and produces postnatal adverse effects.

Toxicology 2020 Jul 2:152534. Epub 2020 Jul 2.

Department of Toxicology, School of Public Health, Peking University, Beijing Key Laboratory of Toxicological Research and Risk Assessment for Food Safety, Beijing, 100191, PR China. Electronic address:

We showed previously that chlormequat chloride, a widely used plant growth regulator, could affect embryonic growth and growth hormone (GH)-insulin-like growth factor 1 (IGF-1) axis of rats. However, the potential effects of low dose chlormequat chloride exposure during pregnancy on embryonic and postnatal growth and development remain unclear. To further assess the risk of chlormequat chloride to human embryonic growth and postnatal health, we exposed maternal rats orally to the chemical during pregnancy at 5 mg/kg. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.tox.2020.152534DOI Listing
  • Page 1 of 30198