keyword
MENU ▼
Read by QxMD icon Read
search

Heavy metal screen

keyword
https://www.readbyqxmd.com/read/28602193/rapid-extraction-and-assay-of-uranium-from-environmental-surface-samples
#1
Christopher A Barrett, Wilaiwan Chouyyok, Robert J Speakman, Khris B Olsen, Raymond Shane Addleman
Environmental sampling to detect trace nuclear signatures is key component of international nuclear treaty enforcement. Herein, we explored rapid chemical extraction methods coordinated with measurement systems to provide faster, simpler assay of low level uranium from environmental samples. A key problem with the existing analytical method for processing environmental surface samples is the requirement for complete digestion of sample and sampling material. This is a time-consuming and labor-intensive process that limits laboratory throughput, elevates analytical costs, and increases background levels...
October 1, 2017: Talanta
https://www.readbyqxmd.com/read/28511314/-determination-of-cadmium-in-human-urine-by-colloidal-gold-immunochromatographic-assay
#2
G Y Fu, J Gong, X X Leng
Objective: To establish the method of colloidal gold immunochrom atographic assay for detecting cadmium ions rapidly. Methods: The anti-cadmium ion monoclonal antibody-gold conjugate was labeled on the binding pad, cadmium ion hapten and goat anti-mouse IgG were coated on nitrocellulose membrane as the detection line (T line) and quality control line (C line) respectively. The sample pad, colloidal gold bonding pad, nitrocellulose membrane and absorption pad were orderly assembled on the PVC board to cut into a test paper strip...
March 20, 2017: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/28467056/easy-preparable-butyrylcholinesterase-microgel-construct-for-facilitated-organophosphate-biosensing
#3
Larisa V Sigolaeva, Snezhana Yu Gladyr, Olga Mergel, Arjan P H Gelissen, Michael Noyong, Ulrich Simon, Dmitry V Pergushov, Ilya N Kurochkin, Felix A Plamper, Walter Richtering
A versatile guest matrix was fabricated from a temperature- and pH-sensitive poly(N-isopropylacrylamide)-co-(3-(N,N-dimethylamino)propylmethacrylamide) microgel (poly(NIPAM-co-DMAPMA), MG) for the gentle incorporation of butyrylcholinesterase (BChE). The microgel/BChE films were built up on a surface of graphite-based screen-printed electrodes (SPEs) premodified with MnO2 nanoparticles via a two-step sequential adsorption under careful temperature and pH control. On this basis, a rather simple amperometric biosensor construct was formed, which uses butyrylthiocholine as BChE substrate with subsequent MnO2-mediated thiocholine oxidation at a graphite-based SPE...
June 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28467055/microfluidic-technology-uncovering-the-mechanisms-of-nanocrystal-nucleation-and-growth
#4
Ioannis Lignos, Richard Maceiczyk, Andrew J deMello
The controlled and reproducible formation of colloidal semiconductor nanocrystals (or quantum dots) is of central importance in nanoscale science and technology. The tunable size- and shape-dependent properties of such materials make them ideal candidates for the development of efficient and low-cost displays, solar cells, light-emitting devices, and catalysts. The formidable difficulties associated with the macroscale preparation of semiconductor nanocrystals (possessing bespoke optical and chemical properties) result from the fact that underlying reaction mechanisms are complex and that the reactive environment is difficult to control...
May 3, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28441590/screening-arabidopsis-mutants-in-genes-useful-for-phytoremediation
#5
María Sanz-Fernández, María Rodríguez-Serrano, Ana Sevilla-Perea, Liliana Pena, M Dolores Mingorance, Luisa M Sandalio, María C Romero-Puertas
Emissions of heavy metals have risen over the past 200 years and significantly exceed those from natural sources. Phytoremediation strategies may be able to recover soil productivity in self-sustaining ecosystems; however, our knowledge of the molecular mechanisms involved in plant heavy-metal perception and signalling is scarce. The aim of this study was to assemble a "molecular tool box" of genes useful for phytoremediation. To identify mutants with different heavy-metal-tolerance, we first selected a medium from mixtures containing three metals based on their presence in two Spanish mining areas and then screened about 7000 lines of Arabidopsis T-DNA mutants and found 74 lines more resistant and 56 more susceptible than the wild type (WT)...
April 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28414730/elements-including-metals-in-the-atomizer-and-aerosol-of-disposable-electronic-cigarettes-and-electronic-hookahs
#6
Monique Williams, Krassimir Bozhilov, Sanjay Ghai, Prue Talbot
OBJECTIVE: Our purpose was to quantify 36 inorganic chemical elements in aerosols from disposable electronic cigarettes (ECs) and electronic hookahs (EHs), examine the effect of puffing topography on elements in aerosols, and identify the source of the elements. METHODS: Thirty-six inorganic chemical elements and their concentrations in EC/EH aerosols were determined using inductively coupled plasma optical emission spectroscopy, and their source was identified by analyzing disassembled atomizers using scanning electron microscopy and energy dispersive X-ray spectroscopy...
2017: PloS One
https://www.readbyqxmd.com/read/28407499/alleviation-of-heavy-metal-toxicity-and-phytostimulation-of-brassica-campestris-l-by-endophytic-mucor-sp-mhr-7
#7
Mahwish Zahoor, Muhammad Irshad, Hazir Rahman, Muhammad Qasim, Sahib Gul Afridi, Muhammad Qadir, Anwar Hussain
Heavy metal (HM) pollution is of great concern in countries like Pakistan where a huge proportion of human population is exposed to it. These toxic metals are making their way from water bodies to soil where it not only interferes with plant growth and development but also initiates serious health issues in human consuming the produce of such soils. Bioremediation is one of the most viable and efficient solution for the problem. Purpose of the current study was to isolate endophytic fungi from plants grown on HM contaminated soil and screen them for their ability to tolerate multiple HM including chromium (Cr(6+)), manganese (Mn(2+)), cobalt (Co(2+)), copper (Cu(2+)) and zinc (Zn(2+))...
August 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28393530/a-new-electrochemical-system-based-on-a-flow-field-shaped-solid-electrode-and-3d-printed-thin-layer-flow-cell-detection-of-pb-2-ions-by-continuous-flow-accumulation-square-wave-anodic-stripping-voltammetry
#8
Qianwen Sun, Jikui Wang, Meihua Tang, Liming Huang, Zhiyi Zhang, Chang Liu, Xiaohua Lu, Kenneth W Hunter, Guosong Chen
Here we describe a new and sensitive flow electrochemical detection system that employs a novel flow-field shaped solid electrode (FFSSE). The system was constructed with a 3D-printed thin-layer flow cell (TLFC) and a flat screen-printed FFSSE with USB connection. This interface facilitates continuous flow accumulation square-wave anodic stripping voltammetry (ASV). The flow distribution in the working space of TLFC was simulated using the finite element method (FEM) and the shape and configuration of electrodes were optimized accordingly...
April 13, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28391473/analysis-of-znta-gene-in-environmental-escherichia-coli-and-additional-implications-on-its-role-in-zinc-translocation
#9
Anandhan Vidhyaparkavi, Jabez Osborne, Subramanian Babu
Escherichia coli strains from sewage sample were screened for the presence and expression of heavy metal-translocating zntA gene by PCR and RT-PCR analysis with type culture of K-12 as standard strain. The strain which showed high level of gene expression (SBVP1) was chosen to further study the growth and heavy metal translocation. This superior strain was grown in the presence of ZnSO4, Pb (CH3COO)2 and mixture of ZnSO4, Pb(CH3COO)2 metal salts and the growth was observed at different time points. The cell pellet fraction was found to have more of zinc than lead as determined by atomic absorption spectroscopy indicating the translocation of these metals from media to the cells...
May 2017: 3 Biotech
https://www.readbyqxmd.com/read/28387709/screening-for-cd-safe-cultivars-of-chinese-cabbage-and-a-preliminary-study-on-the-mechanisms-of-cd-accumulation
#10
Jingjie Wang, Nan Yu, Guangmao Mu, Kamran I Shinwari, Zhenguo Shen, Luqing Zheng
With the rapid progress of industrialization, the effects of environmental contamination on plant toxicity, and subsequently on human health, is a growing concern. For example, the heavy metal pollution of soil such as that caused by cadmium (Cd) is a serious threat. Therefore, screening for pollution-safe edible plants is an essential approach for growing plants under heavy metal-contaminated soils. In the current study, 35 Chinese cabbage (Brassica pekinensis L.) cultivars were selected with the aim of screening for Cd-safe cultivars (CSCs), analyzing their safety, and exploring the mechanism of Cd accumulation...
April 7, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28361403/impact-of-highway-traffic-and-the-acoustic-screen-on-the-content-and-spatial-distribution-of-heavy-metals-in-soils
#11
Szymon Różański, Hanna Jaworska, Katarzyna Matuszczak, Joanna Nowak, Amber Hardy
Recent years have witnessed intensification of road traffic and, with it, the amount of substances emitted by vehicles. Such emissions need to be monitored for public health purposes. The aim of this study was to evaluate the impact of the highway traffic on the total content and bioavailability of Zn, Cu, Ni, Cd, Cr and Pb in nearby soils as well as influence of an acoustic screen on spatial distribution of the metals. The material included 40 soil samples collected from 15 research points located 5, 10, 25 and 50 m away from the road acoustic screen and from 4 points between the screen and the highway...
May 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28339268/entropy-evolution-in-the-magnetic-phases-of-partially-frustrated-cepdal
#12
S Lucas, K Grube, C-L Huang, A Sakai, S Wunderlich, E L Green, J Wosnitza, V Fritsch, P Gegenwart, O Stockert, H V Löhneysen
In the heavy-fermion metal CePdAl, long-range antiferromagnetic order coexists with geometric frustration of one-third of the Ce moments. At low temperatures, the Kondo effect tends to screen the frustrated moments. We use magnetic fields B to suppress the Kondo screening and study the magnetic phase diagram and the evolution of the entropy with B employing thermodynamic probes. We estimate the frustration by introducing a definition of the frustration parameter based on the enhanced entropy, a fundamental feature of frustrated systems...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28337961/biosorption-of-heavy-metals-from-aqueous-solution-by-bacteria-isolated-from-contaminated-soil
#13
Pradeep Dhanwal Anil Kumar Shruti Dudeja Hemlata Badgujar Rohit Chauhan Abhishek Kumar Poonam Dhull Vinod Chhokar Vikas Beniwal
The study was carried out to analyze the heavy metals biosorption potential of bacteria isolated from electroplating industrial effluents contaminated soil. Bacterial isolates were screened for their multi-metal biosorption potential against copper, nickel, lead and chromium. Bacterial isolate CU4A showed maximum uptake of copper, nickel, lead and chromium in aqueous solution with biosorption efficiency as 87.16 %, 79.62%, 84.92% and 68.12%, respectively. The bacterial strain CU4A was identified as Bacillus cereus following 16S rRNA gene sequence analysis...
March 9, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28330266/biosorption-of-lead-copper-and-cadmium-using-the-extracellular-polysaccharides-eps-of-bacillus-sp-from-solar-salterns
#14
Syed Shameer
Extracellular Polysaccharides (EPS) from both prokaryotes and eukaryotes have a great deal of research interest as they protect the producer from different stresses including antibiotics, ionic stress, desiccation and assist in bio-film formation, pathogenesis, adhesion, etc. In this study haloalkaliphilic Bacillus sp., known to cope with osmophilic stress, was selected and screened for EPS production. The EPS were isolated, partially purified and chemical characteristics were documented using liquid FT-IR followed by assessment of heavy metal biosorption (lead, copper and cadmium) using Atomic Absorption Spectroscopy (AAS)...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28276067/in-vitro-and-in%C3%A2-vivo-evaluation-of-weissella-cibaria-and-lactobacillus-plantarum-for-their-protective-effect-against-cadmium-and-lead-toxicities
#15
O Ojekunle, K Banwo, A I Sanni
Thirty-two lactic acid bacteria (LAB) isolates were obtained from fermenting cassava mash and wara (African soft cheese) and screened for their resistance to cadmium and lead toxicities at 550-1050 mg l(-1) and probiotic potentials. Four LAB strains that tolerated the heavy metals at 1050 mg l(-1) were selected for antioxidative capacities, tolerance to acid, bile salts and simulated gastric and intestinal tract and safety status. The results revealed that Weissella cibaria WD2 and Lactobacillus plantarum CaD1 exhibited comparatively higher antioxidative capacities, survived in simulated gastric and intestinal transit, tolerated acid and bile salt and possessed safety status...
March 9, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28272633/a-modular-platform-to-develop-peptoid-based-selective-fluorescent-metal-sensors
#16
Abigail S Knight, Rishikesh U Kulkarni, Effie Y Zhou, Jenna M Franke, Evan W Miller, Matthew B Francis
Despite the reduction in industrial use of toxic heavy metals, there remain contaminated natural water sources across the world. Herein we present a modular platform for developing selective sensors for toxic metal ions using N-substituted glycine, or peptoid, oligomers coupled to a fluorophore. As a preliminary evaluation of this strategy, structures based on previously identified metal-binding peptoids were synthesized with terminal pyrene moieties. Both derivatives of this initial design demonstrated a turn-off response in the presence of various metal ions...
March 25, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28270983/clinically-compatible-flexible-wide-field-multi-color-fluorescence-endoscopy-with-a-porcine-colon-model
#17
Gyugnseok Oh, Youngrong Park, Su Woong Yoo, Soonjoo Hwang, Alexey V Dan Chin-Yu, Yeon-Mi Ryu, Sang-Yeob Kim, Eun-Ju Do, Ki Hean Kim, Sungjee Kim, Seung-Jae Myung, Euiheon Chung
Early detection of structural or molecular changes in dysplastic epithelial tissues is crucial for cancer screening and surveillance. Multi-targeting molecular endoscopic fluorescence imaging may improve noninvasive detection of precancerous lesions in the colon. Here, we report the first clinically compatible, wide-field-of-view, multi-color fluorescence endoscopy with a leached fiber bundle scope using a porcine model. A porcine colon model that resembles the human colon is used for the detection of surrogate tumors composed of multiple biocompatible fluorophores (FITC, ICG, and heavy metal-free quantum dots (hfQDs))...
February 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28251535/copper-tolerant-rhizosphere-bacteria-characterization-and-assessment-of-plant-growth-promoting-factors
#18
Manohari Rathi, Yogalakshmi Kadapakkam Nandabalan
Remediation of heavy metal contaminated soil is a major problem or concern worldwide. Heavy metal accumulation in the soil is increasing day by day by industries, mines, agriculture, fuel combustion and municipal waste discharge. Such contaminated soils harbour a large number of resistant microbial populations. Screening and isolation of such microbes would be utilized for natural remediation of metal contaminated soils. Therefore, in the present study, highly copper-tolerant bacteria from rhizosphere soil of Cynodon dactylon grown in brass effluent contaminated soil were isolated and assessed for plant growth promoting factors...
April 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28129904/a-miniaturized-bismuth-based-sensor-to-evaluate-the-marine-organism-styela-plicata-bioremediation-capacity-toward-heavy-metal-polluted-seawater
#19
Noemi Colozza, Maria Flavia Gravina, Luca Amendola, Modesto Rosati, Djamal Eddine Akretche, Danila Moscone, Fabiana Arduini
Cadmium and lead are highly toxic heavy metals which cause a severe worldwide pollution. In addition to the toxic effect produced by the direct exposure, they can be bioconcentrated and accumulated in living organisms, including humans. Herein, a miniaturized and disposable electrochemical sensor was improved for the simultaneous detection of cadmium and lead ions to study the bioremediation of polluted seawater in presence of the filter-feeding marine organism Styela plicata. A screen-printed electrode modified in situ with a bismuth film was selected using the anodic stripping analysis as detection technique...
April 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28074835/topological-dirac-nodal-lines-and-surface-charges-in-fcc-alkaline-earth-metals
#20
Motoaki Hirayama, Ryo Okugawa, Takashi Miyake, Shuichi Murakami
In nodal-line semimetals, the gaps close along loops in k space, which are not at high-symmetry points. Typical mechanisms for the emergence of nodal lines involve mirror symmetry and the π Berry phase. Here we show via ab initio calculations that fcc calcium (Ca), strontium (Sr) and ytterbium (Yb) have topological nodal lines with the π Berry phase near the Fermi level, when spin-orbit interaction is neglected. In particular, Ca becomes a nodal-line semimetal at high pressure. Owing to nodal lines, the Zak phase becomes either π or 0, depending on the wavevector k, and the π Zak phase leads to surface polarization charge...
January 11, 2017: Nature Communications
keyword
keyword
93410
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"