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https://www.readbyqxmd.com/read/28732398/simulation-of-targeted-pollutant-mitigation-strategies-to-reduce-nitrate-and-sediment-hotspots-in-agricultural-watershed
#1
Awoke Dagnew Teshager, Philip W Gassman, Silvia Secchi, Justin T Schoof
About 50% of U.S. water pollution problems are caused by non-point source (NPS) pollution, primarily sediment and nutrients from agricultural areas, despite the widespread implementation of agricultural Best Management Practices (BMPs). However, the effectiveness of implementation strategies and type of BMPs at watershed scale are still not well understood. In this study, the Soil and Water Assessment Tool (SWAT) ecohydrological model was used to assess the effectiveness of pollutant mitigation strategies in the Raccoon River watershed (RRW) in west-central Iowa, USA...
July 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28732345/multichannel-electroanalytical-devices-for-competitive-elisa-of-phenylethanolamine-a
#2
Yang Liu, Meng Cai, Weiping Wu, Yuting Fang, Pei She, Shouming Xu, Jianguo Li, Kang Zhao, Jingjuan Xu, Ning Bao, Anping Deng
Herein, we reported a disposable electroanalytical device for competitive enzyme-linked immunosorbent assay (ELISA) of phenylethanolamine A (PA). Conductive carbon tape coated with gold cluster served as the working electrode, while the counter and reference electrodes were fabricated on the filter paper by the screen-printing technique. Separating fabrication of the working electrode from other electrodes could make it possible for full utilization of the working electrode modification in bulk and no contamination of the immune-reagents on the counter and reference electrodes...
April 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28732316/a-user-friendly-technical-set-up-for-infrared-photography-of-forensic-findings
#3
Thomas Rost, Nicole Kalberer, Eva Scheurer
Infrared photography is interesting for a use in forensic science and forensic medicine since it reveals findings that normally are almost invisible to the human eye. Originally, infrared photography has been made possible by the placement of an infrared light transmission filter screwed in front of the camera objective lens. However, this set-up is associated with many drawbacks such as the loss of the autofocus function, the need of an external infrared source, and long exposure times which make the use of a tripod necessary...
July 10, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28732277/assessment-of-metal-and-pah-profiles-in-suds-soil-based-on-an-improved-experimental-procedure
#4
Damien Tedoldi, Ghassan Chebbo, Daniel Pierlot, Yves Kovacs, Marie-Christine Gromaire
The increasing use of infiltration-based systems for stormwater management questions the soil's ability to act as a long-term filter for runoff contaminants, and brings about operational matters regarding the most effective maintenance practices to enhance contaminant retention in SUDS. This paper reports the vertical extent of metal and PAH contamination in the soil of seven source-control devices in operation for more than 10 years, assessed via a two-step sampling strategy to optimize the representativeness of the contamination profiles...
July 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28732276/sampling-and-single-particle-analysis-for-the-chemical-characterisation-of-fine-atmospheric-particulates-a-review
#5
REVIEW
Michele Elmes, Massimo Gasparon
To better understand the potential environmental and human health impacts of fine airborne particulate matter (APM), detailed physical and chemical characterisation is required. The only means to accurately distinguish between the multiple compositions in APM is by single particle analysis. A variety of methods and instruments are available, which range from filter-based sample collection for off-line laboratory analysis to on-line instruments that detect the airborne particles and generate size distribution and chemical data in real time...
July 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28732188/adapted-methods-for-scanning-electron-microscopy-in-assessment-of-human-sperm-morphology
#6
Petra Nussdorfer, Ines Cilenšek, Branko Zorn, Daniel Petrovič
Infertility is a widespread problem, and in some cases, the routine basic semen analysis is not sufficient to detect the cause of male infertility. The use of the scanning electron microscope (SEM) could provide a detailed insight into spermatozoa morphology, but it requires specific sample preparation techniques. The purpose of this study was to select, adjust, and optimize a method for the preparation of spermatozoa samples prior to SEM analysis, and to establish the protocol required for its use in clinical practice...
July 21, 2017: Bosnian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/28732083/apol1-risk-alleles-among-individuals-with-ckd-in-northern-tanzania-a-pilot-study
#7
John W Stanifer, Francis Karia, Venance Maro, Kajiru Kilonzo, Xuejun Qin, Uptal D Patel, Elizabeth R Hauser
INTRODUCTION: In sub-Saharan Africa, approximately 100 million people have CKD, yet genetic risk factors are not well-understood. Despite the potential importance of understanding APOL1 risk allele status among individuals with CKD, little genetic research has been conducted. Therefore, we conducted a pilot study evaluating the feasibility of and willingness to participate in genetic research on kidney disease, and we estimated APOL1 risk allele frequencies among individuals with CKD...
2017: PloS One
https://www.readbyqxmd.com/read/28732010/biofilm-imaging-in-porous-media-by-laboratory-x-ray-tomography-combining-a-non-destructive-contrast-agent-with-propagation-based-phase-contrast-imaging-tools
#8
Maxence Carrel, Mario A Beltran, Verónica L Morales, Nicolas Derlon, Eberhard Morgenroth, Rolf Kaufmann, Markus Holzner
X-ray tomography is a powerful tool giving access to the morphology of biofilms, in 3D porous media, at the mesoscale. Due to the high water content of biofilms, the attenuation coefficient of biofilms and water are very close, hindering the distinction between biofilms and water without the use of contrast agents. Until now, the use of contrast agents such as barium sulfate, silver-coated micro-particles or 1-chloronaphtalene added to the liquid phase allowed imaging the biofilm 3D morphology. However, these contrast agents are not passive and potentially interact with the biofilm when injected into the sample...
2017: PloS One
https://www.readbyqxmd.com/read/28731817/infrared-spectrometer-for-exomars-a-mast-mounted-instrument-for-the-rover
#9
Oleg I Korablev, Yurii Dobrolensky, Nadezhda Evdokimova, Anna A Fedorova, Ruslan O Kuzmin, Sergei N Mantsevich, Edward A Cloutis, John Carter, Francois Poulet, Jessica Flahaut, Andrew Griffiths, Matthew Gunn, Nicole Schmitz, Javier Martín-Torres, Maria-Paz Zorzano, Daniil S Rodionov, Jorge L Vago, Alexander V Stepanov, Andrei Yu Titov, Nikita A Vyazovetsky, Alexander Yu Trokhimovskiy, Alexander G Sapgir, Yurii K Kalinnikov, Yurii S Ivanov, Alexei A Shapkin, Andrei Yu Ivanov
ISEM (Infrared Spectrometer for ExoMars) is a pencil-beam infrared spectrometer that will measure reflected solar radiation in the near infrared range for context assessment of the surface mineralogy in the vicinity of the ExoMars rover. The instrument will be accommodated on the mast of the rover and will be operated together with the panoramic camera (PanCam), high-resolution camera (HRC). ISEM will study the mineralogical and petrographic composition of the martian surface in the vicinity of the rover, and in combination with the other remote sensing instruments, it will aid in the selection of potential targets for close-up investigations and drilling sites...
June 2017: Astrobiology
https://www.readbyqxmd.com/read/28731783/identification-of-sppl2a-inhibitors-by-multiparametric-analysis-of-a-high-content-ultra-high-throughput-screen
#10
Xian Zhang, Marjo Götte, Yvonne Ibig-Rehm, Ansgar Schuffenhauer, Marion Kamke, Dan Beisner, Danilo Guerini, Daniela Siebert, Ghislain M C Bonamy, Daniela Gabriel, Ursula Bodendorf
The intramembrane protease signal peptide peptidase-like 2a (SPPL2a) is a potential drug target for the treatment of autoimmune diseases due to an essential role in B cells and dendritic cells. To screen a library of 1.4 million compounds for inhibitors of SPPL2a, we developed an imaging assay detecting nuclear translocation of the proteolytically released cytosolic substrate fragment. The state-of-the-art hit calling approach based on nuclear translocation resulted in numerous false-positive hits, mainly interrupting intracellular protein trafficking...
July 1, 2017: SLAS Discovery
https://www.readbyqxmd.com/read/28731761/dissipatively-stabilized-quantum-sensor-based-on-indirect-nuclear-nuclear-interactions
#11
Q Chen, I Schwarz, M B Plenio
We propose to use a dissipatively stabilized nitrogen vacancy (NV) center as a mediator of interaction between two nuclear spins that are protected from decoherence and relaxation of the NV due to the periodical resets of the NV center. Under ambient conditions this scheme achieves highly selective high-fidelity quantum gates between nuclear spins in a quantum register even at large NV-nuclear distances. Importantly, this method allows for the use of nuclear spins as a sensor rather than a memory, while the NV spin acts as an ancillary system for the initialization and readout of the sensor...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731574/rapid-buffer-and-ligand-screening-for-affinity-chromatography-by-multiplexed-surface-plasmon-resonance-imaging
#12
Karin P M Geuijen, Daniëlle E J W van Wijk-Basten, David F Egging, Richard B M Schasfoort, Michel H Eppink
Protein purifications are often based on the principle of affinity chromatography, where the protein of interest selectively binds to an immobilized ligand. The development of affinity purification requires selecting proper wash and elution conditions. In recent years, miniaturization of the purification process is applied to speed up the development (e.g. microtiterplates, robocolumns). We have studied the application of surface plasmon resonance imaging (SPRi) as a tool to simultaneously screen many buffer conditions for wash and elution steps in an affinity-based purification process...
July 21, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28731512/fast-and-simultaneous-determination-of-1-h-1-h-and-1-h-19-f-scalar-couplings-in-complex-spin-systems-application-of-psyche-homonuclear-broadband-decoupling
#13
Veera Mohana Rao Kakita, Kavitha Rachineni, Ramakrishna V Hosur
The present manuscript focuses on fast and simultaneous determination of (1) H-(1) H and (1) H-(19) F scalar couplings in fluorinated complex steroid molecules. Incorporation of broadband PSYCHE homonuclear decoupling in the indirect dimension of zero-quantum filtered diagonal experiments (F1-PSYCHE-DIAG) suppresses (1) H-(1) H scalar couplings, however it retains (1) H-(19) F scalar couplings (along F1-dimension) for the (19) F coupled protons while preserving the pure-shift nature for (1) H resonances uncoupled to (19) F...
July 21, 2017: Magnetic Resonance in Chemistry: MRC
https://www.readbyqxmd.com/read/28731071/-potential-impact-of-colors-of-filters-used-in-sunglasses-on-the-melatonin-suppression-process
#14
Grzegorz Owczarek, Grzegorz Gralewicz, Agnieszka Wolska, Natalia Skuza, Piotr Jurowski
BACKGROUND: In this article the methods for determining spectral transmittance of optical radiation in the visible waveband range through selected materials used as optical filters against solar glare were described. MATERIAL AND METHODS: Transmittance coefficients specified for the fraction of light passing through tested filters, taking into account the mechanism of eye adaptation to daylight and night vision and the melatonin suppression process were compared for 4 dyed sunglass filters...
July 10, 2017: Medycyna Pracy
https://www.readbyqxmd.com/read/28730802/sensing-single-molecule-penetration-into-nanopores-pushing-the-time-resolution-to-the-diffusion-limit
#15
Igor Bodrenko, Jiajun Wang, Samuele Salis, Mathias Winterhalter, Matteo Ceccarelli
To quantify small molecule penetration into and eventually permeation through nanopores, we applied an improved excess-noise analysis of the ion current fluctuation caused by entering molecules. The kinetic parameters of substrate entry and leave are derived from a two-state Markov model, analyzing the substrate concentration depen- dence of the average ion current and its variance. Including filter corrections allows one to detect the transition rates beyond the cutoff frequency, fc, of the instrumental ion-current filter...
July 21, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28730564/a-new-approach-to-assess-occupational-exposure-to-airborne-fungal-contamination-and-mycotoxins-of-forklift-drivers-in-waste-sorting-facilities
#16
Carla Viegas, Tiago Faria, Ana Cebola de Oliveira, Liliana Aranha Caetano, Elisabete Carolino, Anita Quintal-Gomes, Magdalena Twarużek, Robert Kosicki, Ewelina Soszczyńska, Susana Viegas
The waste management industry is an important employer, and exposure of waste-handling workers to microorganisms is considered an occupational health problem. Besides fungal contamination, it is important to consider the co-occurrence of mycotoxins in this setting. Forklifts with closed cabinet and air conditioner are commonly used in waste industry to transport waste and other products within the facilities, possibly increasing the risk of exposure under certain conditions. The aim of this study was to assess the fungal contamination and mycotoxin levels in filters from the air conditioning system of forklift cabinets, as an indicator to assess occupational exposure of the drivers working in a waste sorting facility...
July 20, 2017: Mycotoxin Research
https://www.readbyqxmd.com/read/28729959/shot-gun-proteome-and-transcriptome-mapping-of-the-jujube-floral-organ-and-identification-of-a-pollen-specific-s-locus-f-box-gene
#17
Ruihong Chen, Guoliang Chen, Jian Huang
The flower is a plant reproductive organ that forms part of the fruit produced as the flowering season ends. While the number and identity of proteins expressed in a jujube (Ziziphus jujuba Mill.) flower is currently unknown, integrative proteomic and transcriptomic analyses provide a systematic strategy of characterizing the floral biology of plants. We conducted a shotgun proteomic analysis on jujube flowers by using a filter-aided sample preparation tryptic digestion, followed by liquid chromatography-tandem mass spectrometry (LC-MS/MS)...
2017: PeerJ
https://www.readbyqxmd.com/read/28729623/3d-qsar-studies-on-maslinic-acid-analogs-for-anticancer-activity-against-breast-cancer-cell-line-mcf-7
#18
Sarfaraz Alam, Feroz Khan
Global prevalence of breast cancer and its rising frequency makes it a key area of research in drug discovery programs. The research article describes the development of field based 3D-QSAR model based on human breast cancer cell line MCF7 in vitro anticancer activity, which defines the molecular level understanding and regions of structure-activity relationship for triterpene maslinic acid and its analogs. The key features such as average shape, hydrophobic regions and electrostatic patterns of active compounds were mined and mapped to virtually screen potential analogs...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729556/observation-of-aggregation-triggered-by-resonance-energy-transfer-ret-induced-intermolecular-pairing-force
#19
Xiaoyong Pan, Weizhi Wang, Lin Ke, Nan Zhang
In this report, we showed the existence of RET induced intermolecular pairing force by comparing their fluorescence behaviors under room illumination vs standing in dark area for either PFluAnt solution or PFluAnt&PFOBT mixture. Their prominent emission attenuation under room illumination brought out the critical role of photo, i.e. RET induced intermolecular pairing force in induction of polymer aggregation. Constant UV-Vis absorption and fluorescence spectra in terms of both peak shapes and maximum wavelengths implied no chemical decomposition was involved...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729139/endoscope-drying-and-its-pitfalls
#20
REVIEW
J Kovaleva
Inadequate drying of endoscope channels is a possible cause of replication and survival of remaining pathogens during storage. The presence during storage of potentially contaminated water in endoscope channels may promote bacterial proliferation and biofilm formation. An incomplete drying procedure or lack of drying and not storing in a vertical position are the most common problems identified during drying and endoscope storage. Inadequate drying and storage procedures, together with inadequate cleaning and disinfection, are the most important sources of endoscope contamination and post-endoscopic infection...
July 17, 2017: Journal of Hospital Infection
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