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https://www.readbyqxmd.com/read/29327003/carbon-dots-as-absorbance-promoter-probes-for-detection-of-cu-ii-ions-in-aqueous-solution-central-composite-design-approach
#1
S A R Shahamirifard, M Ghaedi, M Montazerozohori, A Masoudiasl
In this work, the use of carbon dots (CDs) as a complexing agent and sensitizer in a polymeric matrix for determination of copper(ii) by UV-vis spectroscopy is reported for the first time. A new and highly selective Schiff base, namely, (N',N'''E,N',N'''E)-N',N'''-((((2-hydroxypropane-1,3-diyl)bis(oxy))bis(2,1-phenylene))bis(methan-ylylidene))di(isonicotinohydrazide) (NHBMDI), was also incorporated in the polymeric matrix. For the first time, the membrane composition of the proposed optical sensor including NHBMDI as the ionophore, tetraphenylborate (NaTPB) as the anionic additive, dibutyl phthalate (DBP) as the plasticizer and polyvinyl chloride (PVC) as the immobilizer was optimized through central composite design combined with the desirability function approach (DFA) because this method saves material and time consumption and is therefore cost effective...
January 12, 2018: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/29326827/premature-ventricular-contraction-induced-cardiomyopathy
#2
David J Callans
Premature ventricular contractions (PVCs) are very common and usually do not require treatment. However, in the clinical setting of troublesome symptoms, or when PVCs trigger polymorphic ventricular tachycardia or cause cardiomyopathy, proper treatment is critical. In this review, the clinical syndrome of PVC-induced cardiomyopathy, including risk factors for development and treatment, is discussed. Although PVC-induced cardiomyopathy is typically associated with frequent PVCs there are also patients with this burden that do not develop cardiomyopathy, suggesting a differential susceptibility...
December 2017: Arrhythmia & Electrophysiology Review
https://www.readbyqxmd.com/read/29322142/nanoconfinement-effects-of-chemically-reduced-graphene-oxide-nanoribbons-on-poly-vinyl-chloride
#3
J H Choe, J Jeon, M E Lee, J J Wie, H-J Jin, Y S Yun
Polymeric nanocomposites with graphene-based nanocarbons (GNCs) have been extensively studied with emphasis on the percolation of nanofillers toward electrical, rheological, and mechanical reinforcement. In this study, we report an unusual indirect reinforcing phenomenon of highly defective GNCs dispersed in the poly(vinyl chloride) (PVC) matrix via densification of the polymer packing originating from nanoscale confinement. Herein, chemically reduced graphene oxide nanoribbons (C-rGONRs) are employed as a nanofiller...
January 11, 2018: Nanoscale
https://www.readbyqxmd.com/read/29315060/comparative-study-on-the-removal-efficiency-of-hydrogen-sulfide-h2s-using-three-different-packings
#4
Shihua Pu, Zuohua Liu, Feiyun Yang, Dingbiao Long, Wen Liu, Hao Wang, Kaipei Huang, Xiu Huang
To improve the removal efficiency on hydrogen sulfide (H2S), a biofilter was developed and was made of PVC pipes. The effects of three different packings (i.e., packing A, packing B, and packing C), containing different proportions of activated carbon, sawdust, wormcast, perlite, and pig manure compost, based on different biofilter parameters on H2S removal efficiency were investigated. With the extension of running time, the H2S removal rate of packing A reached up to 90.12%, that of packing B reached a peak at 92...
January 9, 2018: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/29314486/temperature-sensitivity-of-soil-organic-carbon-decomposition-increased-with-mean-carbon-residence-time-field-incubation-and-data-assimilation
#5
Xuhui Zhou, Xia Xu, Guiyao Zhou, Yiqi Luo
Temperature sensitivity of soil organic carbon (SOC) decomposition is one of the major uncertainties in predicting climate-carbon (C) cycle feedback. Results from previous studies are highly contradictory with old soil C decomposition being more, similarly, or less sensitive to temperature than decomposition of young fractions. The contradictory results are partly from difficulties in distinguishing old from young SOC and their changes over time in the experiments with or without isotopic techniques. In this study, we have conducted a long-term field incubation experiment with deep soil collars (0-70 cm in depth, 10 cm in diameter of PVC tubes) for excluding root C input to examine apparent temperature sensitivity of SOC decomposition under ambient and warming treatments from 2002 to 2008...
January 3, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29310391/catheter-ablation-of-premature-ventricular-contractions-originating-from-aortic-sinus-cusps-in-a-patient-with-dextrocardia-and-situs-solitus-a-case-report
#6
Chao-Feng Chen, Xiao-Hua Liu, Xiao-Fei Gao, Bin Chen, Yi-Zhou Xu
BACKGROUND: Premature ventricular contractions (PVCs) originating from aortic sinus cusps is not infrequent and can be eliminated effectively by radiofrequency ablation with rare complications. However, after a review of the medical literature, and to our knowledge, this is the first case of successful idiopathic aortic sinus cusps-PVC-ablation using a 3-dimensional (3D) mapping system in an adult with dextrocardia. METHODS: A 62-year-old male with dextrocardia and situs inversus underwent catheter ablation of frequent PVCs...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29306130/effect-of-composting-on-the-thermal-decomposition-behavior-and-kinetic-parameters-of-pig-manure-derived-solid-waste
#7
Vaibhav Dhyani, Mukesh Kumar Awasthi, Quan Wang, Jitendra Kumar, Xiuna Ren, Junchao Zhao, Hongyu Chen, Meijing Wang, Thallada Bhaskar, Zengqiang Zhang
In this work, the influence of composting on the thermal decomposition behavior and decomposition kinetics of pig manure-derived solid wastes was analyzed using thermogravimetry. Wheat straw, biochar, zeolite, and wood vinegar were added to pig manure during composting. The composting was done in the 130 L PVC reactors with 100 L effective volume for 50 days. The activation energy of pyrolysis of samples before and after composting was calculated using Friedman's method, while the pre-exponential factor was calculated using Kissinger's equation...
December 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29305677/coupling-interval-variability-of-premature-ventricular-contractions-in-patients-with-different-underlying-pathology-an-insight-into-the-arrhythmia-mechanism
#8
Lennart J de Vries, Mihran Martirosyan, Ron T van Domburg, Sip A Wijchers, Tamas Géczy, Tamas Szili-Torok
PURPOSE: Coupling interval (CI) variability of premature ventricular contractions (PVCs) is influenced by the underlying arrhythmia mechanism. The aim of this study was to compare CI variability of PVCs in different myocardial disease entities, in order to gain insight into their arrhythmia mechanism. METHODS: Sixty-four patients with four underlying pathologies were included: idiopathic (n = 16), non-ischemic dilated cardiomyopathy (NIDCM) (n = 16), familial cardiomyopathy (PLN/LMNA) (n = 16), and post-MI (n = 16)-associated PVCs...
January 5, 2018: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/29299546/implementation-of-a-plasticized-pvc-based-cation-selective-optode-system-into-a-paper-based-analytical-device-for-colorimetric-sodium-detection
#9
Hiroyuki Shibata, Terence G Henares, Kentaro Yamada, Koji Suzuki, Daniel Citterio
On the example of a colorimetric sodium assay, this work demonstrates the implementation of a classical cation-exchange optode relying on an ionophore-doped plasticized PVC membrane into a paper-based analytical device (PAD). An ion-selective optode (ISO) system has been arranged into a vertically-assembled PAD (vPAD) integrating a pH-buffering function. Capillary force-driven sample liquid transportation through the paper matrix enabled pH-adjustment prior to the optical detection of the analyte cation. Functionalized paper layers with inkjet-deposited ISO membranes were combined with whole device lamination to attain a stable ion-exchange equilibrium required for the theoretical behavior of ISOs...
January 4, 2018: Analyst
https://www.readbyqxmd.com/read/29284144/trophic-predator-prey-relationships-promote-transport-of-microplastics-compared-with-the-single-hypoaspis-aculeifer-and-folsomia-candida
#10
Dong Zhu, Qing-Fang Bi, Qian Xiang, Qing-Lin Chen, Peter Christie, Xin Ke, Long-Hua Wu, Yong-Guan Zhu
Although the roles of earthworms and soil collembolans in the transport of microplastics have been studied previously, the effects of the soil biota at different trophic levels and interspecific relationships remain poorly understood. Here, we examine three soil microarthropod species to explore their effects on the transport of microplastics. The selected Folsomia candida and Hypoaspis aculeifer are extensively used model organisms, and Damaeus exspinosus is a common and abundant indigenous species in China...
December 25, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29283991/arabidopsis-choline-transporter-like-1-ctl1-regulates-secretory-trafficking-of-auxin-transporters-to-control-seedling-growth
#11
Yuan Wang, Lei Yang, Yumei Tang, Renjie Tang, Yanping Jing, Chi Zhang, Bin Zhang, Xiaojuan Li, Yaning Cui, Chunhua Zhang, Jisen Shi, Fugeng Zhao, Wenzhi Lan, Sheng Luan
Auxin controls a myriad of plant developmental processes and plant response to environmental conditions. Precise trafficking of auxin transporters is essential for auxin homeostasis in plants. Here, we report characterization of Arabidopsis CTL1, which controls seedling growth and apical hook development by regulating intracellular trafficking of PIN-type auxin transporters. The CTL1 gene encodes a choline transporter-like protein with an expression pattern highly correlated with auxin distribution and is enriched in shoot and root apical meristems, lateral root primordia, the vascular system, and the concave side of the apical hook...
December 2017: PLoS Biology
https://www.readbyqxmd.com/read/29277286/the-relationship-between-the-s-wave-in-lead-1-and-recurrence-of-rvot-pvc-ablation
#12
Hacı Murat Güneş, Gültekin Günhan Demir, Oğuz Karaca, Filiz Kızılırmak Yılmaz, Ersin İbişoğlu, Tayyar Gökdeniz, Mehmet Onur Omaygenç, Ekrem Güler, Gamze Babur Güler, Ümeyir Savur, Beytullah Çakal, İrfan Barutçu, Fethi Kılıçaslan
BACKGROUND: Radiofrequency catheter ablation (CA) is a common non-pharmacological treatment option for ventricular premature contractions (PVCs) originating from right ventricular outflow tract (RVOT). In this study, we aimed to investigate the relationship between recurrence after CA for RVOT-PVC and S-wave in lead 1 that was shown to be associated with RVOT depolarization. METHODOLOGY: A total of 104 patients who were referred to our clinic for CA for idiopathic RVOT-PVC between 2012 and 2015years were enrolled...
December 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/29276243/stability-of-procainamide-injection-in-clear-glass-vials-and-polyvinyl-chloride-bags
#13
Ronald F Donnelly
Objectives: The objective of this study was to evaluate the chemical stability of procainamide hydrochloride, 100 mg/mL, when repackaged in clear glass vials or diluted to 3 mg/mL with normal saline and packaged in polyvinyl chloride (PVC) bags when stored at either 23°C and exposed to light (ETL) or 5°C and protected from light (PFL). Methods: Solutions were assayed using a stability-indicating high-performance liquid chromatography method. Samples (5 mL) were collected from triplicate containers on days 0, 7, 14, 21, 28, 56, 91, and 193...
November 2017: Hospital Pharmacy
https://www.readbyqxmd.com/read/29274535/in%C3%A2-vitro-effects-of-virgin-microplastics-on-fish-head-kidney-leucocyte-activities
#14
Cristóbal Espinosa, José María García Beltrán, María Angeles Esteban, Alberto Cuesta
Microplastics are well-documented pollutants in the marine environment that result from production or fragmentation of larger plastic items. The knowledge about the direct effects of microplastics on immunity, including fish, is still very limited. We investigated the in vitro effects of microplastics [polyvinylchloride (PVC) and polyethylene (PE)] on gilthead seabream (Sparus aurata) and European sea bass (Dicentrarchus labrax) head-kidney leucocytes (HKLs). After 1 and 24 h of exposure of HKLs with 0 (control), 1, 10 and 100 mg mL-1 MPs in a rotatory system, cell viability, innate immune parameters (phagocytic, respiratory burst and peroxidase activities) and the expression of genes related to inflammation (il1b), oxidative stress (nrf2, prdx3), metabolism of xenobiotics (cyp1a1, mta) and cell apoptosis (casp3) were studied...
December 20, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29273993/migration-of-epoxidized-soybean-oil-from-polyvinyl-chloride-polyvinylidene-chloride-food-packaging-wraps-into-food-simulants
#15
Min Sun Choi, Shaheed Ur Rehman, Hyeon Kim, Sang Beom Han, Jeongmi Lee, Jongki Hong, Hye Hyun Yoo
Epoxidized soybean oil (ESBO) has been used in polyvinyl chloride (PVC)/polyvinylidene chloride (PVDC) food packaging cling film as a plasticizer and stabilizer. The aim of this study was to investigate the migration of ESBO from PVC/PVDC cling film, based on gas chromatography mass spectrometry (GC-MS). The specific migration of ESBO was evaluated using various food simulants (water, 4% acetic acid, 50% ethanol and n-heptane) for PVC and PVDC wrap products. ESBO did not migrate into water and 4% acetic acid for all the tested samples...
December 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29261096/novel-design-of-honeybee-inspired-needles-for-percutaneous-procedure
#16
Mohammad Sahlabadi, Parsaoran Hutapea
The focus of this paper is to present new designs of innovative bioinspired needles to be used during percutaneous procedures. Insect stingers have been known to easily penetrate soft tissues. Bioinspired needles mimicking the barbs in a honeybee stinger were developed for a smaller insertion force, which can provide a less invasive procedure. Decreasing the insertion force will decrease the tissue deformation, which is essential for a more accurate targeting. In this study, some design parameters, in particular, barb shape and geometry (i...
December 20, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29258474/full-title-peripheral-venous-catheter-complications-in-children-predisposing-factors-in-a-multicenter-prospective-cohort-study
#17
Rim Ben Abdelaziz, Habiba Hafsi, Hela Hajji, Hela Boudabous, Amel Ben Chehida, Ali Mrabet, Khadija Boussetta, Sihem Barsaoui, Azza Sammoud, Mourad Hamzaoui, Hatem Azzouz, Néji Tebib
BACKGROUND: Peripheral venous catheterization (PVC) is frequently used in children. This procedure is not free from potential complications. Our purpose was to identify the types and incidences of PVC complications in children and their predisposing factors in a developing country. METHODS: We conducted a prospective observational multicenter study in five pediatric and pediatric surgery departments over a period of 2 months. Two hundred fifteen PVC procedures were conducted in 98 children...
December 19, 2017: BMC Pediatrics
https://www.readbyqxmd.com/read/29250239/frequent-premature-ventricular-contractions-and-cardiomyopathy-chicken-and-egg-situation
#18
REVIEW
Kıvanç Yalin, Ebru Gölcük
Premature ventricular contractions (PVCs) are usually regarded as benign in the absence of structural heart disease. However, frequent PVCs can lead to depressed LV function, called PVC-induced cardiomyopathy and can be reversible after suppression of PVCs. On the other hand, PVCs can be a part of underlying structural heart disease and may be linked to increased risk of sudden death. In this work, we reviewed the current literature on PVC-induced cardiomyopathy based on a case presentation.
August 2017: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/29249309/triboelectrostatic-separation-of-polypropylene-polyurethane-and-polyvinylchloride-used-in-passenger-vehicles
#19
Tuyu Li, Dali Yu, Hongshen Zhang
Recycling and reuse of automotive plastics have elicited global attention due to the increasing number of end-of-life vehicles. Through the single-factor experiment, a high-voltage triboelectrostatic sorting device was developed to separate polypropylene (PP), polyurethane (PU), and polyvinylchloride (PVC) in a plastic mixture commonly used in exterior and interior parts of passenger vehicles. Products of PP, PU, and PVC were obtained after two-stage separation; their purity exceeded 95%, and their productivities were 74%, 94%, and 41%, respectively...
December 14, 2017: Waste Management
https://www.readbyqxmd.com/read/29246582/could-some-procedures-commonly-used-in-bioassays-with-the-copepod-acartia-tonsa-dana-1849-distort-results
#20
Laís Fernanda de Palma Lopes, Vanessa Ochi Agostini, Erik Muxagata
Many organizations have suggested the use of the Calanoid copepod Acartia tonsa in protocols for acute toxicity tests. Nevertheless, these protocols present some problems, such as using 60-180µm meshes to separate specific stages of A. tonsa or carrying out the tests using small volumes that reflect high densities of A. tonsa that do not occur in nature, which could lead to distorted results. In addition, ecotoxicological studies may use statistical approaches that are inadequate for the type of data being analysed...
December 12, 2017: Ecotoxicology and Environmental Safety
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