keyword
MENU ▼
Read by QxMD icon Read
search

Environmental chemistry

keyword
https://www.readbyqxmd.com/read/28533633/photolithography-free-laser-patterned-hf-acid-resistant-chromium-polyimide-mask-for-rapid-fabrication-of-microfluidic-systems-in-glass
#1
Konstantin O Zamuruyev, Yuriy Zrodnikov, Cristina E Davis
Excellent chemical and physical properties of glass, over a range of operating conditions, make it a preferred material for chemical detection systems in analytical chemistry, biology, and the environmental sciences. However, it is often compromised with SU8, PDMS, or Parylene materials due to the sophisticated mask preparation requirements for wet etching of glass. Here, we report our efforts toward developing a photolithography-free laser-patterned hydrofluoric acid-resistant chromium-polyimide tape mask for rapid prototyping of microfluidic systems in glass...
January 2017: Journal of Micromechanics and Microengineering: Structures, Devices, and Systems
https://www.readbyqxmd.com/read/28531951/identifying-and-quantifying-geochemical-and-mixing-processes-in-the-matanza-riachuelo-aquifer-system-argentina
#2
S Armengol, M Manzano, S A Bea, S Martínez
The Matanza-Riachuelo River Basin, in the Northeast of the Buenos Aires Province, is one of the most industrialized and populated region in Argentina and it is worldwide known for its alarming environmental degradation. In order to prevent further damages, the aquifer system, which consists of two overlaid aquifers, is being monitored from 2008 by the river basin authority, Autoridad de la Cuenca Matanza-Riachuelo. The groundwater chemical baseline has been established in a previous paper (Zabala et al., 2016), and this one is devoted to the identification of the main physical and hydrogeochemical processes that control groundwater chemistry and its areal distribution...
May 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28531195/livestock-metabolomics-and-the-livestock-metabolome-a-systematic-review
#3
Seyed Ali Goldansaz, An Chi Guo, Tanvir Sajed, Michael A Steele, Graham S Plastow, David S Wishart
Metabolomics uses advanced analytical chemistry techniques to comprehensively measure large numbers of small molecule metabolites in cells, tissues and biofluids. The ability to rapidly detect and quantify hundreds or even thousands of metabolites within a single sample is helping scientists paint a far more complete picture of system-wide metabolism and biology. Metabolomics is also allowing researchers to focus on measuring the end-products of complex, hard-to-decipher genetic, epigenetic and environmental interactions...
2017: PloS One
https://www.readbyqxmd.com/read/28530197/green-fabricated-cuo-nanobullets-via-olea-europaea-leaf-extract-shows-auspicious-antimicrobial-potential
#4
Qaisar Maqbool, Sidra Iftikhar, Mudassar Nazar, Fazal Abbas, Asif Saleem, Talib Hussain, Rizwan Kausar, Sadaf Anwaar, Nyla Jabeen
In present investigation, copper oxide (CuO) nanostructures have been prepared via green chemistry. Olea europaea leaf extract act as strong chelating agent for tailoring physical as well as bio-medical characteristics of CuO at the nano-size. Physical characterisation such as scanning electron microscope analysis depicts the formation of homogenised spherical shape nanoparticles (NPs) with average size of 42 nm. X-ray diffraction and Fourier transform infrared spectroscopy further confirmed the crystalline pure phase and monoclinic structure...
June 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28529382/reversibly-manipulating-the-surface-chemistry-of-polymeric-nanostructures-via-a-grafting-to-approach-mediated-by-nucleobase-interactions
#5
Zan Hua, Robert Keogh, Zhen Li, Thomas R Wilks, Guosong Chen, Rachel K O'Reilly
"Grafting to" polymeric nanostructures or surfaces is a simple and versatile approach to achieve functionalization. Herein, we describe the formation of mixed polymer-grafted nanoparticles through a supramolecular "grafting to" method that exploits multiple hydrogen-bonding interactions between the thymine (T)-containing cores of preformed micelles and the complementary nucleobase adenine (A) of added diblock copolymers. To demonstrate this new "grafting to" approach, mixed-corona polymeric nanoparticles with different sizes were prepared by the addition of a series of complementary diblock copolymers containing thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) to a preformed micelle with a different coronal forming block, poly(4-acryloylmorpholine) (PNAM)...
May 9, 2017: Macromolecules
https://www.readbyqxmd.com/read/28528626/colloid-particle-formulations-for-antimicrobial-applications
#6
REVIEW
Ahmed F Halbus, Tommy S Horozov, Vesselin N Paunov
Colloidal particles are being extensively studied in various antimicrobial applications due to their small size to volume ratio and ability to exhibit a wide spectrum of antibacterial, antifungal, antialgal and antiviral action. The present review focuses on various nanoparticles (NPs) of inorganic, organic and hybrid materials, and discusses some of the methods for their preparation as well as mechanisms of their antimicrobial action. We consider the antimicrobial applications of metal oxide nanoparticles (ZnO, MgO, CuO, Cu2O, Al2O3, TiO2, CeO2 and Y2O3), metal nanoparticles (NPs), such as copper, silver and gold, metal hydroxide NPs such as Mg(OH)2 as well as hybrid NPs made from biodegradable materials, such as chitosan, lignin and dextran, loaded with other antimicrobial agents...
May 12, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28528499/metal-transport-and-remobilisation-in-a-basin-affected-by-acid-mine-drainage-the-role-of-ochreous-amorphous-precipitates
#7
Sirio Consani, Cristina Carbone, Enrico Dinelli, Tonci Balić-Žunić, Laura Cutroneo, Marco Capello, Gabriella Salviulo, Gabriella Lucchetti
Metal-polluted mine waters represent a major threat to the quality of waters and sediments in a downstream basin. At the confluence between acidic mine waters and the unpolluted waters of the Gromolo Torrent (Liguria, North-West Italy), the massive formation of an ochreous amorphous precipitate takes place. This precipitate forms a soft blanket that covers the torrent bed and can be observed down to its mouth in the sea. The aim of this work is to evaluate the dispersion of metals in the Gromolo Torrent basin from the abandoned Cu-Fe sulphide mine of Libiola to the Ligurian Sea and to assess the metal remobilisation from the amorphous precipitates...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28525710/mercury-telluride-quantum-dot-based-phototransistor-enabling-high-sensitivity-room-temperature-photodetection-at-2000-nanometers
#8
Mengyu Chen, Haipeng Lu, Nema M Abdelazim, Ye Zhu, Zhen Wang, Wei Ren, Stephen V Kershaw, Andrey L Rogach, Ni Zhao
Near-to-Mid infrared photodetection technologies could be widely deployed to advance the infrastructures of surveillance, environmental monitoring and manufacturing, if the detection devices would be low-cost, in compact format and with high performance. For such application requirements, colloidal quantum dot (QD) based photodetectors stand out as particularly promising due to the solution processability and ease of integration with silicon technologies; unfortunately, the detectivity of the QD photodetectors towards longer wavelengths has so far been low...
May 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28522008/chitosan-chondroitin-sulfate-hydrogels-prepared-in-hmim-hso4-ionic-liquid
#9
Cátia S Nunes, Kessily B Rufato, Paulo R Souza, Elizângela A M S de Almeida, Michael J V da Silva, Débora B Scariot, Celso V Nakamura, Fernanda A Rosa, Alessandro F Martins, Edvani C Muniz
[Hmim][HSO4] ionic liquid (IL) and bio-renewable sources as chitosan (CHT) and chondroitin sulfate (CS) were used to yield hydrogel-based materials (CHT/CS). The use of IL to solubilize both polysaccharides was considered an innovative way based on "green chemistry" principle, aiming the production of CHT/CS blended systems. CHT/CS hydrogels were carried out in homogeneous medium from short dissolution times. The hydrogels were characterized and achieved with excellent stabilities (in the 1.2-10pH range), larger swelling capacities, as well as devoid of cytotoxicity towards the normal VERO and diseased HT29 cells...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521388/non-targeted-high-resolution-mass-spectrometry-strategy-for-simultaneous-monitoring-of-xenobiotics-and-endogenous-compounds-in-green-sea-turtles-on-the-great-barrier-reef
#10
Amy L Heffernan, Maria M Gómez-Ramos, Caroline Gaus, Soumini Vijayasarathy, Ian Bell, Christine Hof, Jochen F Mueller, Maria J Gómez-Ramos
Chemical contamination poses a threat to ecosystem, biota and human health, and identifying these hazards is a complex challenge. Traditional hazard identification relies on a priori-defined targets of limited chemical scope, and is generally inappropriate for exploratory studies such as explaining toxicological effects in environmental systems. Here we present a non-target high resolution mass spectrometry environmental monitoring study with multivariate statistical analysis to simultaneously detect biomarkers of exposure (e...
May 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28521100/single-step-synthesis-of-small-azide-functionalized-gold-nanoparticles-versatile-water-dispersible-reagents-for-click-chemistry
#11
Edward W Elliott, Aurora L Ginzburg, Zachary C Kennedy, Zhenshuo Feng, James E Hutchison
Nanoparticles possessing functional groups that can be readily conjugated (e.g. through click chemistry) are important precursors for the preparation of customized nanohybrid products. Such nanoparticles, if they are stable against agglomeration, are easily dispersible and have well-defined surface chemistry and size. As click-ready reagents, they can be stored until their time of use and then simply dispersed and reacted with an appropriate substrate. Gold nanoparticles (AuNPs) are excellent candidates for this purpose and some clickable gold nanoparticles have been developed; however, AuNPs for use in aqueous systems are often prepared through difficult multistep processes and/or can be poorly dispersible in water...
May 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28518086/ptr-tof-ms-coupled-with-an-automated-sampling-system-and-tailored-data-analysis-for-food-studies-bioprocess-monitoring-screening-and-nose-space-analysis
#12
Vittorio Capozzi, Sine Yener, Iuliia Khomenko, Brian Farneti, Luca Cappellin, Flavia Gasperi, Matteo Scampicchio, Franco Biasioli
Proton Transfer Reaction (PTR), combined with a Time-of-Flight (ToF) Mass Spectrometer (MS) is an analytical approach based on chemical ionization that belongs to the Direct-Injection Mass Spectrometric (DIMS) technologies. These techniques allow the rapid determination of volatile organic compounds (VOCs), assuring high sensitivity and accuracy. In general, PTR-MS requires neither sample preparation nor sample destruction, allowing real time and non-invasive analysis of samples. PTR-MS are exploited in many fields, from environmental and atmospheric chemistry to medical and biological sciences...
May 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28516207/enhancing-h2o2-resistance-of-an-esterase-from-pyrobaculum-calidifontis-by-structure-guided-engineering-of-the-substrate-binding-site
#13
Pengfei Zhou, Dongming Lan, Grzegorz Maria Popowicz, Xuping Wang, Bo Yang, Yonghua Wang
Green technologies are attracting increasing attention in industrial chemistry where enzymatic reactions can replace dangerous and environmentally unfriendly chemical processes. In situ enzymatic synthesis of peroxycarboxylic acid is an attractive alternative for several industrial applications although concentrated H2O2 can denature the biocatalyst, limiting its usefulness. Herein, we report the structure-guided engineering of the Pyrobaculum calidifontis esterase (PestE) substrate binding site to increase its stability and perhydrolysis activity...
May 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28513146/insights-into-antimony-adsorption-on-001-tio2-xafs-and-dft-study
#14
Li Yan, Jiaying Song, Ting-Shan Chan, Chuanyong Jing
Antimony (Sb) contamination poses an emerging environmental risk, whereas its removal remains a contemporary challenge due to the lack of knowledge in its surface chemistry and efficient adsorbent. In this study, self-assembly {001} TiO2 was examined for its effectiveness in Sb removal, and the molecular level surface chemistry was studied with X-ray absorption spectroscopy and density functional theory calculations. The kinetics results show that Sb adsorption followed the pseudo-second order reaction, and the Langmuir adsorption capacity was 200 mg/g for Sb(III) and 156 mg/g for Sb(V)...
May 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28512003/towards-a-sustainable-biobased-industry-highlighting-the-impact-of-extremophiles
#15
REVIEW
Anna Krüger, Christian Schäfers, Carola Schröder, Garabed Antranikian
The transition of the oil-based economy towards a sustainable economy completely relying on biomass as renewable feedstock requires the concerted action of academia, industry, politics and civil society. An interdisciplinary approach of various fields such as microbiology, molecular biology, chemistry, genetics, chemical engineering and agriculture in addition to cross-sectional technologies such as economy, logistics and digitalization is necessary to meet the future global challenges. The genomic era has contributed significantly to the exploitation of naturés biodiversity also from extreme habitats...
May 13, 2017: New Biotechnology
https://www.readbyqxmd.com/read/28511037/role-of-ph-and-ionic-strength-in-the-aggregation-of-tio2-nanoparticles-in-the-presence-of-extracellular-polymeric-substances-from-bacillus-subtilis
#16
Di Lin, S Drew Story, Sharon L Walker, Qiaoyun Huang, Wei Liang, Peng Cai
Increased use of commercial titanium dioxide nanoparticles (TiO2 NPs) in consumer products most likely leads to their additional environmental release. Aggregation and disaggregation processes are expected to play an important role in the fate and transport of TiO2 NPs in natural aquatic ecosystems. Therefore, in this work, we have studied the colloidal stability of TiO2 NPs in the presence of extracellular polymeric substances (EPS) from Bacillus subtilis and the adsorption behavior of EPS on TiO2 NPs in aqueous solutions at different pH values and ionic strengths (IS)...
May 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28509907/a-database-of-georeferenced-nutrient-chemistry-data-for-mountain-lakes-of-the-western-united-states
#17
Jason Williams, Stephanie G Labou
Human activities have increased atmospheric nitrogen and phosphorus deposition rates relative to pre-industrial background. In the Western U.S., anthropogenic nutrient deposition has increased nutrient concentrations and stimulated algal growth in at least some remote mountain lakes. The Georeferenced Lake Nutrient Chemistry (GLNC) Database was constructed to create a spatially-extensive lake chemistry database needed to assess atmospheric nutrient deposition effects on Western U.S. mountain lakes. The database includes nitrogen and phosphorus water chemistry data spanning 1964-2015, with 148,336 chemistry results from 51,048 samples collected across 3,602 lakes in the Western U...
May 16, 2017: Scientific Data
https://www.readbyqxmd.com/read/28505098/alcohols-as-substrates-and-solvents-for-the-construction-of-3-alkoxylated-2-oxindoles-by-direct-alkoxylation-of-3-halooxindoles
#18
Bing Lin, Zhi-Yong Chen, Huan-Huan Liu, Qi-Di Wei, Ting-Ting Feng, Ying Zhou, Can Wang, Xiong-Li Liu, Wei-Cheng Yuan
Described herein is an environmentally benign method for the synthesis of multisubstituted 3-alkoxylated-2-oxindoles 3 via direct alkoxylation of 3-halooxindoles 1. A wide variety of such multisubstituted 3-alkoxylated-2-oxindole scaffolds were smoothly obtained in good yields (up to 94%) by heating in an oil bath at 35 °C for 24 h. A particularly valuable feature of this method was the development of environment-friendly chemistry using alcohols 2 as both the substrates and solvents in the presence of a catalytic amount of base...
May 13, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28502166/grouping-of-petroleum-substances-as-example-uvcbs-by-ion-mobility-mass-spectrometry-to-enable-chemical-composition-based-read-across
#19
Fabian Alexander Grimm, William K Russell, Yu-Syuan Luo, Yasuhiro Iwata, Weihsueh A Chiu, Tim Roy, Peter J Boogaard, Hans B Ketelslegers, Ivan Rusyn
Substances of Unknown or Variable composition, Complex reaction products, and Biological materials (UVCBs), including many refined petroleum products, present a major challenge in regulatory submissions under the EU Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) and US High Production Volume regulatory regimes. The inherent complexity of these substances, as well as variability in composition obfuscates detailed chemical characterization of each individual substance and their grouping for human and environmental health evaluation through read-across...
May 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28498333/hypervalent-iodine-reagents-in-high-valent-transition-metal-chemistry
#20
REVIEW
Felipe Cesar Sousa E Silva, Anthony F Tierno, Sarah E Wengryniuk
Over the last 20 years, high valent metal complexes have evolved from mere curiosities to being at the forefront of modern catalytic method development. This approach has enabled transformations complimentary to those possible via traditional manifolds, most prominently carbon-heteroatom bond formation. Key to the advancement of this chemistry has been the identification of oxidants that are capable of accessing these high oxidation state complexes. The oxidant has to be both powerful enough to achieve the desired oxidation as well as provide heteroatom ligands for transfer to the metal center; these heteroatoms are often subsequently transferred to the substrate via reductive elimination...
May 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
keyword
keyword
29346
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"