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https://www.readbyqxmd.com/read/28738607/novel-colorimetric-assay-for-paraquat-detection-on-silica-bead-using-negatively-charged-silver-nanoparticles
#1
Weena Siangproh, Thachkorn Somboonsuk, Orawan Chailapakul, Kriangsak Songsrirote
A simple, rapid, sensitive, and economical method based on colorimetry for the determination of paraquat, a widely used herbicide, was developed. Citrate-coated silver nanoparticles (AgNPs) were synthesized as the colorimetric probe. The mechanism of the assay is related to the aggregation of negatively charged AgNPs as induced by positively-charged paraquat resulting from coulombic attraction which causes the color to change from a deep greenish yellow to pale yellow in accordance with the concentrations of paraquat...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738584/production-of-stable-and-sensitive-sers-substrate-based-on-commercialized-porous-material-of-silanized-support
#2
Han Zhang, Lin Sun, Yuan Zhang, Yan Kang, Huilian Hu, Huirong Tang, Yiping Du
This paper reports accurate synthesis of a new type of surface-enhanced Raman spectroscopy (SERS) substrate based on gold nanoparticles decorated 201 red silanized diatomaceous supports. The developed SERS substrate is easy to fabricate, cost effective and offers sensitive rapid detection. The performance and stability of the SERS substrate was investigated and the results showed good SERS activity of substrate that can last for more than 6 months. Tiazophos and phosmet pesticides in aqueous solutions can be detected clearly at a low concentration of 0...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738556/development-of-a-new-sample-preparation-method-based-on-liquid-liquid-liquid-extraction-combined-with-dispersive-liquid-liquid-microextraction-and-its-application-on-unfiltered-samples-containing-high-content-of-solids
#3
Mir Ali Farajzadeh, Maryam Abbaspour
A new sample preparation method based on liquid-liquid-liquid extraction combined with dispersive liquid-liquid microextraction followed by gas chromatography-flame ionization detection has been reported for the extraction/preconcentration and determination of trace levels of twelve pesticide residues from different samples with high content of solids without filtration. This method consists of a three-phase system including an aqueous phase (sample solution), acetonitrile, and hexane. The extraction mechanism is based on different affinities of the substances from the sample matrices towards each of the involved phase, which provides a high selectivity to the process...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738207/translocation-of-heavy-metals-from-soils-into-floral-organs-and-rewards-of-cucurbita-pepo-implications-for-plant-reproductive-fitness
#4
Erna Xun, Yanwen Zhang, Jimin Zhao, Jixun Guo
Metals and metalloids in soil could be transferred into reproductive organs and floral rewards of hyperaccumulator plants and influence their reproductive success, yet little is known whether non-hyperaccumulator plants can translocate heavy metals from soil into their floral organs and rewards (i.e., nectar and pollen) and, if so, whether plant reproduction will be affected. In our studies, summer squash (Cucurbita pepo L. cv. Golden Apple) was exposed to heavy-metal treatments during bud stage to investigate the translocation of soil-supplemented zinc, copper, nickel and lead into its floral organs (pistil, anther and nectary) and rewards (nectar and pollen) as well as floral metal accumulation effects on its reproduction...
July 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28736923/applications-of-additive-manufacturing-in-dentistry-a-review
#5
REVIEW
Aishwarya Bhargav, Vijayavenkatraman Sanjairaj, Vinicius Rosa, Lu Wen Feng, Jerry Fuh Yh
Additive manufacturing (AM) or 3D printing has been hailed as the third industrial revolution as it has caused a paradigm shift in the way objects have been manufactured. Conventionally, converting a raw material to a fully finished and assembled, usable product comprises several steps which can be eliminated by using this process as functional products can be created directly from the raw material at a fraction of the time originally consumed. Thus, AM has found applications in several sectors including automotive, aerospace, printed electronics, and healthcare...
July 24, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28734042/multivariate-optimization-of-conditions-for-digestion-of-wet-feeds-for-dogs-and-cats-using-a-closed-digester-block-and-multielement-determination-by-icp-oes
#6
Dayara Virgínia Lino Ávila, Sidnei Oliveira Souza, Silvlvânio Silvlvério Lopes Costa, Carlos Alexandre Borges Garcia, José do Patrocínio Hora Alvlves, Rennan Geovanny Oliveira Araujo, Elisangela Andrade Passos
A full 2⁴ factorial design was applied to find the best combination of diluted reagents (HNO₃ and H₂O₂), time, and temperature for the digestion of samples of wet feed for dogs and cats using a closed digestion block. The residual carbon concentration (RCC) was used as the response in the factorial design. All variables and their interactions significantly influenced the digestion of the feed samples, as indicated by the RCC. The conditions established for the digestion of 0.05 g (dry mass) wet feed samples were the addition of 3...
July 21, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28732403/ecosystem-service-trade-offs-and-their-influencing-factors-a-case-study-in-the-loess-plateau-of-china
#7
Qiang Feng, Wenwu Zhao, Bojie Fu, Jingyi Ding, Shuai Wang
Soil erosion control (SEC), carbon sequestration (CAS), and soil moisture (SMO) strongly interact in the semi-arid Loess Plateau. Since SMO has supportive effects on SEC and CAS, it can be considered as ecosystem service (ES), and there is an immediate need to coordinate the relationships among these ecosystem services (ESs) to promote the sustainability of vegetation recovery. In this study, we quantified the ESs, ES trade-offs, and the environmental factors in 151 sample plots in the Ansai watershed, and we used a redundancy analysis (RDA) to clarify the effects of environmental factors on these ESs and their trade-offs...
July 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28730696/cd34-cells-seeded-in-collagen-scaffolds-promote-bone-formation-in-a-mouse-calvarial-defect-model
#8
Jens Hertweck, Ulrike Ritz, Hermann Götz, Patrick C Schottel, Pol Maria Rommens, Alexander Hofmann
Bone tissue engineering (BTE) holds promise for managing the clinical problem of large bone defects. However, clinical adoption of BTE is limited due to limited vascularization of constructs, which could be circumvented by pre-cultivation of osteogenic and endothelial derived cells in natural-based polymer scaffolds. However, until now not many studies compared the effect of mono- and cocultures pre-seeded in collagen before implantation. We utilized a mouse calvarial defect model and compared five groups of collagen scaffolds: a negative control of a collagen scaffold alone, a positive control treated with BMP-7, monocultures of either human osteoblasts (hOBs) or CD34+ cells, and a coculture of hOB and CD34(+) cells...
July 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28728873/inactivation-of-alicyclobacillus-acidoterrestris-atcc-49025-spores-in-apple-juice-by-pulsed-light-influence-of-initial-contamination-and-required-reduction-levels
#9
Mariana I Ferrario, Sandra N Guerrero
The purpose of this study was to analyze the response of different initial contamination levels of Alicyclobacillus acidoterrestris ATCC 49025 spores in apple juice as affected by pulsed light treatment (PL, batch mode, xenon lamp, 3pulses/s, 0-71.6J/cm(2)). Biphasic and Weibull frequency distribution models were used to characterize the relationship between inoculum size and treatment time with the reductions achieved after PL exposure. Additionally, a second order polynomial model was computed to relate required PL processing time to inoculum size and requested log reductions...
July 17, 2017: Revista Argentina de Microbiología
https://www.readbyqxmd.com/read/28727251/degree-of-conversion-and-cross-link-density-within-a-resin-matrix-composite
#10
Afnan O Al-Zain, George J Eckert, Henry Lukic, Spiro J Megremis, Jeffrey A Platt
The aims of this study were to profile light radiated from two light-curing units (LCUs) and evaluate profile relationship to polymerization patterns within a resin-matrix composite (RMC). Beam profiles of one multiple emission peak light-emitting-diode and one quartz-tungsten-halogen curing-unit were measured using a beam profiler/spectrometer system. A camera-based profiler and an integrating sphere/spectrometer assembly were used to evaluate each LCU beam. Polymerization patterns within a nano-hybrid RMC were investigated using a mapping approach by assessing the degree of conversion utilizing micro-Raman spectroscopy and indirectly estimating cross-link-density by repeated microhardness testing before and after exposure to ethanol (%KH reduction, n = 3)...
July 20, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28726175/using-ensemble-forecasting-to-examine-how-climate-change-promotes-worldwide-invasion-of-the-golden-apple-snail-pomacea-canaliculata
#11
Juncheng Lei, Lian Chen, Hong Li
The golden apple snail, Pomacea canaliculata, is one of the world's 100 most notorious invasive alien species. Knowledge about the critical climate variables that limit the global distribution range of the snail, as well as predictions of future species distributions under climate change, is very helpful for management of snail. In this study, the climatically suitable habitats for this kind of snail under current climate conditions were modeled by biomod2 and projected to eight future climate scenarios (2 time periods [2050s, 2080s] × 2 Representative Concentration Pathways [RCPs; RCP2...
August 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28725492/role-of-spousal-involvement-in-continuous-positive-airway-pressure-cpap-adherence-in-patients-with-obstructive-sleep-apnea-osa
#12
Salma Batool-Anwar, Carol M Baldwin, Shira Fass, Stuart F Quan
INTRODUCTION: Little is known about the impact of spousal involvement on continuous positive airway pressure (CPAP) adherence. The aim of this study was to determine whether spouse involvement affects adherence with CPAP therapy, and how this association varies with gender. METHODS: 194 subjects recruited from Apnea Positive Pressure Long Term Efficacy Study (APPLES) completed the Dyadic Adjustment Scale (DAS). The majority of participants were Caucasian (83%), and males (73%), with mean age of 56 years, mean BMI of 31 kg/m(2)...
May 2017: Southwest Journal of Pulmonary & Critical Care
https://www.readbyqxmd.com/read/28723243/pathogenicity-of-nectriaceous-fungi-on-avocado-in-australia
#13
Louisamarie Parkinson, Roger Shivas, Elizabeth Dann
Black root rot is a severe disease of young avocado trees in Australia causing black necrotic roots, tree stunting, and leaf drop prior to tree death. Nectriaceous fungi (Nectriaceae, Hypocreales), are commonly isolated from symptomatic roots. This research tested the pathogenicity of 19 isolates from Calonectria, Cylindrocladiella, Dactylonectria, Gliocladiopsis and Ilyonectria, spp. collected from young avocado trees and other hosts. Glasshouse pathogenicity tests with avocado (Persea americana) cv. Reed seedlings confirmed that Calonectria ilicicola is a severe pathogen of avocado, causing stunting, wilting and seedling death within 5 weeks of inoculation...
July 19, 2017: Phytopathology
https://www.readbyqxmd.com/read/28722817/dispersive-solid-phase-extraction-for-the-determination-of-trace-organochlorine-pesticides-in-apple-juices-using-reduced-graphene-oxide-coated-with-zno-nanocomposites-as-sorbent
#14
Ting Sun, Hefeng Sun, Feng Zhao
In this work, reduced graphene oxide coated with ZnO nanocomposites was used as an efficient sorbent of dispersive solid-phase extraction and successfully applied to extraction of organochlorine pesticides from apple juice followed by gas chromatography with mass spectrometry. Several experimental parameters affecting the extraction efficiencies, including the amount of adsorbent, extraction time, and the pH of the sample solution, as well as the type and volume of eluent solvent, were investigated and optimized...
July 19, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28722752/application-of-a-sensory-instrumental-tool-to-study-apple-texture-characteristics-shaped-by-altitude-and-time-of-harvest
#15
Mathilde Charles, Maria Laura Corollaro, Luigi Manfrini, Isabella Endrizzi, Eugenio Aprea, Angelo Zanella, Luca Corelli Grappadelli, Flavia Gasperi
BACKGROUND: Texture is important in the preferences of apple consumers. Of the pre-harvest factors affecting fruit quality and especially texture, altitude and subsequent climatic conditions are crucial, determining differences in the physiological mechanisms of fruit growth, ripening stage and chemical composition, as demonstrated by several studies. This work applies a detailed sensory-instrumental protocol developed in a previous paper(1) to investigate the impact of altitude, time of harvest and their cross-effect on sensory characteristics of apple, with a focus on texture...
July 19, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28720542/one-step-reverse-transcription-loop-mediated-isothermal-amplification-assay-for-detection-of-apple-chlorotic-leaf-spot-virus
#16
Dandan Peng, Jipeng Xie, Wei Qiang, Kai-Shu Ling, Liyun Guo, Zaifeng Fan, Tao Zhou
A reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay was developed for the detection of Apple chlorotic leaf spot virus (ACLSV). In this method, a set of four primers was designed based on the conserved regions in the coat protein gene of ACLSV, and the primers were synthesized for the RT-LAMP assay using total RNA extracted from ACLSV-infected leaf tissues. The optimal reaction temperature and assay time were determined to be 64°C and 75min, respectively. The sensitivity of RT-LAMP reactions was reliable up to a maximum dilution of 1:3125, which was more sensitive than the RT-PCR assay...
July 15, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28719430/high-sensitivity-cardiac-troponin-t-improves-the-diagnosis-of-perioperative-mi
#17
Jamie C Brown, Eslam Samaha, Srikar Rao, Mohammad A Helwani, Andreas Duma, Frank Brown, Brian F Gage, J Philip Miller, Allan S Jaffe, Fred S Apple, Mitchell G Scott, Peter Nagele
BACKGROUND: The diagnosis of myocardial infarction (MI) after noncardiac surgery has traditionally relied on using relatively insensitive contemporary cardiac troponin (cTn) assays. We hypothesized that using a recently introduced novel high-sensitivity cTnT (hscTnT) assay would increase the detection rate of perioperative MI. METHODS: In this ancillary study of the Vitamins in Nitrous Oxide trial, readjudicated incidence rates of myocardial injury (new isolated cTn elevation) and MI were compared when diagnosed by contemporary cTnI versus hscTnT...
July 14, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28714234/an-improved-correlation-to-predict-molecular-weight-between-crosslinks-based-on-equilibrium-degree-of-swelling-of-hydrogel-networks
#18
Andrea C Jimenez-Vergara, John Lewis, Mariah S Hahn, Dany J Munoz-Pinto
Accurate characterization of hydrogel diffusional properties is of substantial importance for a range of biotechnological applications. The diffusional capacity of hydrogels has commonly been estimated using the average molecular weight between crosslinks (Mc ), which is calculated based on the equilibrium degree of swelling. However, the existing correlation linking Mc and equilibrium swelling fails to accurately reflect the diffusional properties of highly crosslinked hydrogel networks. Also, as demonstrated herein, the current model fails to accurately predict the diffusional properties of hydrogels when polymer concentration and molecular weight are varied simultaneously...
July 17, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28714091/habitual-diet-and-diet-quality-in-irritable-bowel-syndrome-a%C3%A2-case-control-study
#19
E F Tigchelaar, Z Mujagic, A Zhernakova, M A M Hesselink, S Meijboom, C W M Perenboom, A A M Masclee, C Wijmenga, E J M Feskens, D M A E Jonkers
BACKGROUND: Diet is considered to be a key factor in symptom generation in Irritable Bowel Syndrome (IBS) and patients tend to exclude food products from their diet in pursue of symptom relief, which may impair diet quality. METHODS: We evaluated habitual dietary intake in IBS patients with regard to nutrients and food products using an extensive food frequency questionnaire. One hundred ninety-four IBS patients were compared to 186 healthy controls using multiple logistic regression analysis...
July 17, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28713362/biocontrol-agents-increase-the-specific-rate-of-patulin-production-by-penicillium-expansum-but-decrease-the-disease-and-total-patulin-contamination-of-apples
#20
Xiangfeng Zheng, Qiya Yang, Xiaoyun Zhang, Maurice T Apaliya, Giuseppe Ianiri, Hongyin Zhang, Raffaello Castoria
Synthetic fungicides are commonly employed for the control of postharvest diseases of fruits. However, due to health concerns about the use of these chemicals, alternative control methods including biocontrol based on antagonistic yeasts are gaining in popularity. In this study, we investigated the effects of two biocontrol yeasts, Rhodotorula mucilaginosa strain 3617 and Rhodotorula kratochvilovae strain LS11, on blue mold and patulin (PAT) contamination caused by Penicillium expansum strains PY and FS7 in artificially inoculated Fuji apples stored at 20°C for 9 days...
2017: Frontiers in Microbiology
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