keyword
MENU ▼
Read by QxMD icon Read
search

Environmental chemistry

keyword
https://www.readbyqxmd.com/read/28744684/the-chemistry-and-toxicity-of-discharge-waters-from-copper-mine-tailing-impoundment-in-the-valley-of-the-apuseni-mountains-in-romania
#1
Piotr Rzymski, Piotr Klimaszyk, Włodzimierz Marszelewski, Dariusz Borowiak, Mirosław Mleczek, Kamil Nowiński, Bożena Pius, Przemysław Niedzielski, Barbara Poniedziałek
Copper mining generates large quantities of waste, tailings, and acid outflows causing long-term environmental impacts and potential threats to human health. Valea Şesei is the largest tailing impoundment in Romania, created by flooding the valley (known as Valea Şesei) of the Metalliferous Mountains (a division of the Apuseni Mountains) with copper mining waste. The present study (i) estimated the total volume of tailings in this area; (ii) screened the concentration of 65 elements (rare earth and platinum group elements, alkali metals and alkali earth metals, transition and post-transition metals and metalloids) and cyanide concentrations in wastewater samples collected from tailing impoundment; (iii) evaluated the toxicity of these water samples using five in vitro bioassays employing human cells isolated from healthy donors and a short-term (1 h) exposure model...
July 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28743564/evolving-biocatalysis-to-meet-bioeconomy-challenges-and-opportunities
#2
REVIEW
Alessandro Pellis, Sara Cantone, Cynthia Ebert, Lucia Gardossi
The unique selectivity of enzymes, along with their remarkable catalytic activity, constitute powerful tools for transforming renewable feedstock and also for adding value to an array of building blocks and monomers produced by the emerging bio-based chemistry sector. Although some relevant biotransformations run at the ton scale demonstrate the success of biocatalysis in industry, there is still a huge untapped potential of catalytic activities available for targeted valorization of new raw materials, such as waste streams and CO2...
July 22, 2017: New Biotechnology
https://www.readbyqxmd.com/read/28739822/stress-responsive-hilpda-is-necessary-for-thermoregulation-during-fasting
#3
Matthew J VandeKopple, Jinghai Wu, Lisa A Baer, Naresh C Bal, Santosh K Maurya, Anuradha Kalyanasundaram, Muthu Periasamy, Kristin I Stanford, Amato Giaccia, Nicholas Denko, Ioanna Papandreou
Hypoxia-Inducible Lipid-Droplet Associated protein (HILPDA) has been shown to localize to lipid droplets in nutrient responsive cell types such as hepatocytes and adipocytes. However, its role in the control of whole-body homeostasis is not known. We sought to measure cell-intrinsic and systemic stress responses in a mouse strain harboring whole body Hilpda deficiency. We generated a genetically engineered mouse model of whole body HILPDA deficiency by replacing the coding HILPDA exon with Luciferase. We subjected the knockout animals to environmental stresses and measured whole-animal metabolic and behavioral parameters...
July 24, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28738154/modifying-surface-chemistry-of-metal-oxides-for-boosting-dissolution-kinetics-in-water-by-liquid-cell-electron-microscopy
#4
Yue Lu, Jiguo Geng, Kuan Wang, Wei Zhang, Wenqiang Ding, Zhenhua Zhang, Shaohua Xie, Hongxing Dai, Fu-Rong Chen, Manling Sui
Dissolution of metal oxides is fundamentally important for understanding mineral evolution and micromachining oxide functional materials. In general, dissolution of metal oxides is a slow and inefficient chemical reaction. Here, by introducing oxygen deficiencies to modify the surface chemistry of oxides, we can boost the dissolution kinetics of metal oxides in water, as in situ demonstrated in a liquid environmental transmission electron microscope (LETEM). The dissolution rate constant significantly increases by 16-19 orders of magnitude, equivalent to a reduction of 0...
July 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28735391/toward-a-resilient-functional-microbiome-drought-tolerance-alleviating-microbes-for-sustainable-agriculture
#5
Venkatachalam Lakshmanan, Prasun Ray, Kelly D Craven
In recent years, the utilization of novel sequencing techniques opened a new field of research into plant microbiota and was used to explore a wide diversity of microorganisms both inside and outside of plant host tissues, i.e., the endosphere and rhizosphere, respectively. An early realization from such research was that species richness and diversity of the plant microbiome are both greater than believed even a few years ago, and soil is likely home to the most abundant and diverse microbial habitats known...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28735244/legacy-and-novel-brominated-flame-retardants-in-interior-car-dust%C3%A2-%C3%A2-implications-for-human-exposure
#6
Athanasios Besis, Christina Christia, Giulia Poma, Adrian Covaci, Constantini Samara
Brominated flame retardants (BFRs) are organobromine compounds with an inhibitory effect on combustion chemistry tending to reduce the flammability of products. Concerns about health effects and environmental threats have led to phase-out or restrictions in the use of Penta-, Octa- and Deca-BDE technical formulations, increasing the demand for Novel BFRs (NBFRs) as replacements for the banned formulations. This study examined the occurrence of legacy and NBFRs in the dust from the interior of private cars in Thessaloniki, Greece, aged from 1 to 19 years with variable origin and characteristics...
July 20, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28733002/aggregation-kinetics-of-single-walled-carbon-nanotubes-influenced-by-the-frequency-of-ultrasound-irradiation-in-the-aquatic-environment
#7
Chang Min Park, Yasir A J Al-Hamadani, Jiyong Heo, Namguk Her, Kyoung Hoon Chu, Min Jang, Sangho Lee, Yeomin Yoon
The colloidal stability of single-walled carbon nanotubes (SWNTs) sonicated at three different ultrasonication (US) frequencies (28, 580, and 1000kHz) were investigated under environmentally relevant conditions. In particular, correlations between surface chemistry, electrokinetic potential, interaction energy, and the aggregation kinetics of the aqueous SWNTs were studied. We observed that H2O2 production is negatively correlated with the yield of hydroxylation and carboxylation of SWNTs, which was dependent on the generation of ultrasonic energy by cavity collapse during US process...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732982/sonochemical-green-reduction-to-prepare-ag-nanoparticles-decorated-graphene-sheets-for-catalytic-performance-and-antibacterial-application
#8
Sayan Ganguly, Poushali Das, Madhuparna Bose, Tushar Kanti Das, Subhadip Mondal, Amit Kumar Das, Narayan C Das
The emerging popularity and wide acceptance of green chemistry and environmentally benign/ecofriendly approaches have comprehensively considered for catalyst synthesis methods. Natural resource derived carbogenic quantum dots has been used in assistance with ultrasonic shock wave to graphene oxide (GO) aqueous dispersion in order to prepare reduced graphene oxide decorated with silver nanoparticles following the 'top-down' method. The total reduction process is done without using any toxic external reducing agents and any surfactants or stabilizers, thus it can be accepted as green method...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732952/ultrasound-promoted-direct-functionalization-of-multi-walled-carbon-nanotubes-in-water-via-diels-alder-click-chemistry
#9
Cuong M Q Le, Xuan Thang Cao, Kwon Taek Lim
A facile and environmentally friendly strategy for grafting polymers onto the surface of multi-walled carbon nanotubes (CNTs) was demonstrated by Diels-Alder "click chemistry". Firstly, the copolymers of poly(styrene-alt-maleic anhydride) (PSM) were prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization and subsequently functionalized with furfuryl amine to introduce anchoring groups. The copolymers were then grafted on CNTs via the Diels-Alder reaction in water through a conventional heating-stirring route and ultrasound-assisted method...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28726691/an-exploratory-study-of-the-effects-of-stormwater-pipeline-materials-on-transported-stormwater-quality
#10
Matthias Borris, Heléne Österlund, Jiri Marsalek, Maria Viklander
Implications of three sewer pipe materials (concrete, galvanized corrugated steel, and polyvinyl chloride (PVC)) for stormwater quality were explored in laboratory experiments, in which three types of stormwater, SW1-SW3, were circulated in 0.5 m long sewer pipe sections. SW1 and SW2 represented synthetic rainwater, without and with fine street sediment added (CTSS = 150 mg/L), respectively, and SW3 was actual stormwater with the same sediment addition as SW2. Following 20-min runs, with an equivalent distance of 500 m travelled by water particles, a number of statistically significant changes in the stormwater chemistry were observed: (i) pH of all the simulated stormwaters increased in the concrete pipe (from 7...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28724405/environmental-drivers-of-viral-community-composition-in-antarctic-soils-identified-by-viromics
#11
Evelien M Adriaenssens, Rolf Kramer, Marc W Van Goethem, Thulani P Makhalanyane, Ian Hogg, Don A Cowan
BACKGROUND: The Antarctic continent is considered the coldest and driest place on earth with simple ecosystems, devoid of higher plants. Soils in the ice-free regions of Antarctica are known to harbor a wide range of microorganisms from primary producers to grazers, yet their ecology and particularly the role of viruses is poorly understood. In this study, we examined the virus community structures of 14 soil samples from the Mackay Glacier region. METHODS: Viral communities were extracted from soil and the dsDNA was extracted, amplified using single-primer amplification, and sequenced using the Ion Torrent Proton platform...
July 19, 2017: Microbiome
https://www.readbyqxmd.com/read/28723166/automated-3-d-printed-arrays-to-evaluate-genotoxic-chemistry-e-cigarettes-and-water-samples
#12
Karteek Kadimisetty, Spundana Malla, James F Rusling
A novel, automated, low cost, three-dimensional (3-D) printed microfluidic array was developed to detect DNA damage from metabolites of chemicals in environmental samples. The electrochemiluminescent (ECL) detection platform incorporates layer-by-layer (LbL) assembled films of microsomal enzymes, DNA and an ECL-emitting ruthenium metallopolymer in ∼10 nm deep microwells. Liquid samples are introduced into the array, metabolized by the human enzymes, products react with DNA if possible, and DNA damage is detected by ECL with a camera...
May 26, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28717021/genetic-and-metabolic-engineering-in-diatoms
#13
REVIEW
Weichao Huang, Fayza Daboussi
Diatoms have attracted considerable attention due to their success in diverse environmental conditions, which probably is a consequence of their complex origins. Studies of their metabolism will provide insight into their adaptation capacity and are a prerequisite for metabolic engineering. Several years of investigation have led to the development of the genome engineering tools required for such studies, and a profusion of appropriate tools is now available for exploring and exploiting the metabolism of these organisms...
September 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28715772/stability-of-single-dispersed-silver-nanoparticles-in-natural-and-synthetic-freshwaters-effects-of-dissolved-oxygen
#14
Xiaoyan Zou, Penghui Li, Jie Lou, Xiaoyan Fu, Hongwu Zhang
Silver nanoparticles (AgNPs) are increasingly used in various commercial products. This increased use raises ecological concerns because of the large release of AgNPs into the environment. Once released, the local water chemistry has the potential to influence the environmental fates and behaviors of AgNPs. The impacts of dissolved oxygen and natural organic matter (NOM) on the dissolution and stability of AgNPs were investigated in synthetic and natural freshwaters for 7 days. In synthetic freshwater, the aggregation of AgNPs occurred due to the compression of the electric double layer, accompanied by the dissolution of AgNPs...
July 14, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28714573/assessment-of-the-dna-damaging-potential-of-environmental-chemicals-using-a-quantitative-high-throughput-screening-approach-to-measure-p53-activation
#15
Kristine L Witt, Jui-Hua Hsieh, Stephanie L Smith-Roe, Menghang Xia, Ruili Huang, Jinghua Zhao, Scott S Auerbach, Junguk Hur, Raymond R Tice
Genotoxicity potential is a critical component of any comprehensive toxicological profile. Compounds that induce DNA or chromosomal damage often activate p53, a transcription factor essential to cell cycle regulation. Thus, within the US Tox21 Program, we screened a library of ∼10,000 (∼8,300 unique) environmental compounds and drugs for activation of the p53-signaling pathway using a quantitative high-throughput screening assay employing HCT-116 cells (p53(+/+) ) containing a stably integrated β-lactamase reporter gene under control of the p53 response element (p53RE)...
July 17, 2017: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/28709053/transport-and-retention-of-biochar-nanoparticles-in-a-paddy-soil-under-environmentally-relevant-solution-chemistry-conditions
#16
Ming Chen, Dengjun Wang, Fan Yang, Xiaoyun Xu, Nan Xu, Xinde Cao
Land application of biochar has been increasingly recommended as a powerful strategy for carbon sequestration and soil remediation. However, the biochar particles, especially those in the nanoscale range, may migrate or carry the inherent contaminants along the soil profile, posing a potential risk to the groundwater. This study investigated the transport and retention of wood chip-derived biochar nanoparticles (NPs) in water-saturated columns packed with a paddy soil. The environmentally-relevant soil solution chemistry including ionic strength (0...
July 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28704772/assessing-the-role-of-bed-sediments-in-the-persistence-of-red-mud-pollution-in-a-shallow-lake-kinghorn-loch-uk
#17
Justyna P Olszewska, Kate V Heal, Ian J Winfield, Lorna J Eades, Bryan M Spears
Red mud is a by-product of alumina production. Little is known about the long-term fate of red mud constituents in fresh waters or of the processes regulating recovery of fresh waters following pollution control. In 1983, red mud leachate was diverted away from Kinghorn Loch, UK, after many years of polluting this shallow and monomictic lake. We hypothesised that the redox-sensitive constituents of red mud leachate, phosphorus (P), arsenic (As) and vanadium (V), would persist in the Kinghorn Loch for many years following pollution control as a result of cycling between the lake bed sediment and the overlying water column...
July 5, 2017: Water Research
https://www.readbyqxmd.com/read/28704064/nucleic-acid-extraction-from-synthetic-mars-analog-soils-for-in-situ-life-detection
#18
Angel Mojarro, Gary Ruvkun, Maria T Zuber, Christopher E Carr
Biological informational polymers such as nucleic acids have the potential to provide unambiguous evidence of life beyond Earth. To this end, we are developing an automated in situ life-detection instrument that integrates nucleic acid extraction and nanopore sequencing: the Search for Extra-Terrestrial Genomes (SETG) instrument. Our goal is to isolate and determine the sequence of nucleic acids from extant or preserved life on Mars, if, for example, there is common ancestry to life on Mars and Earth. As is true of metagenomic analysis of terrestrial environmental samples, the SETG instrument must isolate nucleic acids from crude samples and then determine the DNA sequence of the unknown nucleic acids...
July 13, 2017: Astrobiology
https://www.readbyqxmd.com/read/28703094/dynamic-headspace-sampling-as-an-initial-step-for-sample-preparation-in-chromatographic-analysis
#19
Wojciech Wojnowski, Tomasz Majchrzak, Tomasz Dymerski, Jacek Gębicki, Jacek Namieśnik
This work represents a brief summary of the use of dynamic headspace (DHS) as a technique for sample preparation in chromatographic analysis. Despite numerous developments in the area of analyte isolation and enrichment, DHS remains one of the fundamental methods used with GC. In our opinion, interest in this technique will not diminish significantly because it conforms to stipulations of green analytical chemistry. Moreover, DHS fulfills the need for methods that facilitate detection and determination of analytes present at ultratrace levels in complex matrices...
July 13, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28702627/clean-air-in-the-anthropocene
#20
Jos Lelieveld
In atmospheric chemistry, interactions between air pollution, the biosphere and human health, often through reaction mixtures from both natural and anthropogenic sources, are of growing interest. Massive pollution emissions in the Anthropocene have transformed atmospheric composition to the extent that biogeochemical cycles, air quality and climate have changed globally and partly profoundly. It is estimated that mortality attributable to outdoor air pollution amounts to 4.33 million individuals per year, associated with 123 million years of life lost...
July 12, 2017: Faraday Discussions
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"