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https://www.readbyqxmd.com/read/29786906/reversible-c-h-activation-facile-b-c-b-h-metathesis-and-apparent-hydroboration-catalysis-by-a-xanthene-based-frustrated-lewis-pair
#1
Petra Vasko, Ili A Zulkifly, M Ángeles Fuentes, Zhenbo Mo, Jamie Hicks, Paul C J Kämer, Simon Aldridge
A dimethylxanthene-based phosphine/borane frustrated Lewis pair (FLP) is shown to effect reversible C-H activation, cleaving phenylacetylene, PhCCH, to give an equilibrium mixture of the free FLP and phosphonium acetylide in CD₂Cl₂ solution at room temperature. This system also reacts with B-H bonds although in a different fashion: reactions with HBpin and HBcat proceed via C-B/B-H metathesis, leading to replacement of the -B(C₆F₅)₂ Lewis acid component by -Bpin/-Bcat, and transfer of HB(C₆F₅)₂ to the phosphine Lewis base...
May 22, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29786893/primary-cystic-duct-carcinoma-diagnosed-by-targeted-biopsy-with-digital-cholangioscopy
#2
Masaki Miyazawa, Shogo Matsuda, Uichiro Fuchizaki
A 79-year-old man was introduced to our hospital for obstructive jaundice. Computed tomography (CT) showed the stricture of the common bile duct (CBD) and the cystic duct (CD) (Fig. 1). Suspicious diagnosis was cholangiocarcinoma. Endoscopic retrograde cholangiography (ERC) showed the stricture of the CBD and the CD dilatation. This article is protected by copyright. All rights reserved.
May 22, 2018: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/29786820/determination-of-trace-element-levels-in-patients-with-burst-fractures
#3
Shahab Ahmed Salih Gezh, Abdurrahman Aycan, Halit Demir, Cemal Bozlına
BACKGROUND: This study aimed to determine trace element levels (Zn, Fe, Mn, Mg, Cu, Cd, Co, and Pb) in patients with burst fractures in Van Province, Turkey. METHODS: The study included a total of 44 participants with no additional pathologies, including 22 patients with burst fractures aged over 18 years who were admitted to the neurosurgery departments at two hospitals between June 15, 2015 and January 20, 2016 and 22 healthy volunteers. Serum samples were obtained from all participants to measure the serum levels of trace and heavy elements, including Mn, Cd, Cu, Pb, Fe, Co and Zn, using atomic absorbance spectrophotometry...
May 2018: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/29786720/a-strain-induced-subwavelength-structure-for-a-haze-free-and-highly-transparent-flexible-plastic-substrate
#4
Jae Yong Park, Juyoung Ham, Illhwan Lee, Jong-Lam Lee
This paper presents a method to produce subwavelength-scale (<250 nm) AgCl nanostructures on a flexible plastic film, which is indispensable for highly efficient flexible displays. Using Cl2 plasma treatment on an Ag-coated plastic film, AgCl nanostructures were produced through the reaction of Ag atoms with Cl radicals. During the reaction, the volume of AgCl expands, leading to drastically changed surface morphology from a two-dimensional (2D) flat Ag surface to a 3D subwavelength-scale AgCl nanostructure...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786713/in-situ-fabrication-of-hollow-zno-nc-polyhedra-from-zif-8-for-the-determination-of-trace-cd-ii
#5
Xueping Zhang, Qingqing Wang, Jing Li, Liang Huang, Dengbin Yu, Shaojun Dong
In this work, a novel electrochemical sensor for Cd(ii) detection with differential pulse anodic stripping voltammetry (DPASV) is fabricated based on hollow ZnO@nitrogen-doped carbon (H-ZnO@NC) polyhedra, which are prepared from ZIF-8 via in situ tannic acid etching and a subsequent calcination process. The as-obtained H-ZnO@NC exhibits a polyhedral morphology with a well-defined hollow structure and a uniform distribution of elements C, N, O, and Zn in the shell. The unique structure of H-ZnO@NC can provide an enlarged surface area and abundant active sites...
May 22, 2018: Analyst
https://www.readbyqxmd.com/read/29786626/observation-of-women-soccer-players-physiology-during-a-single-season
#6
Kathleen M Paulsen, Cory L Butts, Brendon P McDermott
Paulsen, KM, Butts, CL, and McDermott, BP. Observation of women soccer players' physiology during a single season. J Strength Cond Res 32(6): 1702-1707, 2018-The purpose of this study was to observe heart rate (HR) responses in match settings over the course of a conference season in National Collegiate Athletic Association Division I women's soccer. Twenty-one female collegiate soccer players were provided a HR monitor and instructed to wear it for the duration of match play. Player positions included 6 defenders (DEF), 6 midfielders (MID), and 9 forwards (FWD)...
June 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29785604/cadmium-phytoextraction-potential-of-king-grass-pennisetum-sinese-roxb-and-responses-of-rhizosphere-bacterial-communities-to-a-cadmium-pollution-gradient
#7
Li Hu, Ru Wang, Xianglin Liu, Bo Xu, Tuanhui Xie, Yunyun Li, Mingkuang Wang, Guo Wang, Yanhui Chen
Screening for tolerant and high biomass producing plants is important for phytoextraction efforts in remediating agricultural soils contaminated by heavy metals. We carried out a greenhouse experiment involving a soil cadmium (Cd) concentration gradient (0.1, 0.5, 1, 2, 4, and 8 mg kg-1 ) to assess growth and phytoextraction capacity of king grass (Pennisetum sinese Roxb.) in soils contaminated by Cd and to explore changes in diversity and structure of rhizosphere soil bacterial communities in response to long-term Cd pollution...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29785602/feasibility-study-of-cadmium-adsorption-by-palm-oil-fuel-ash-pofa-based-low-cost-hollow-fibre-zeolitic-membrane
#8
Mohamad Sukri Mohamad Yusof, Mohd Hafiz Dzarfan Othman, Azeman Mustafa, Mukhlis Abdul Rahman, Juhana Jaafar, Ahmad Fauzi Ismail
Palm oil fuel ash (POFA) is an agricultural waste which was employed in this study to produce novel adsorptive ceramic hollow fibre membranes. The membranes were fabricated using phase inversion-based extrusion technique and sintered at 1150 °C. The membranes were then evaluated on their ability to adsorb cadmium (Cd(II)). These membranes were characterised using (nitrogen) N2 adsorption-desorption analysis, field emission scanning electron microscopy-energy-dispersive X-ray spectroscopy (FESEM-EDX) mapping, X-ray fluorescence (XRF), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) analyses while adsorptivity activity was examined by batch adsorption studies...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29785549/once-episiotomy-always-episiotomy
#9
Ayala Zilberman, Eyal Sheiner, Orit Barrett, Batel Hamou, Tali Silberstein
OBJECTIVE: To investigate the association between episiotomy and perineal damage in the subsequent delivery. STUDY DESIGN: A retrospective cohort study was conducted, comparing outcome of subsequent singleton deliveries of women with and without episiotomy in their first (index) delivery. Deliveries occurred between the years 1991-2015 in a tertiary medical center. Traumatic vaginal tears, multiple pregnancies, and cesarean deliveries (CD) in the index pregnancy were excluded from the analysis...
May 21, 2018: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/29784379/comparison-of-chelex-based-resins-in-diffusive-gradients-in-thin-film-for-high-resolution-assessment-of-metals
#10
Chunyang Zhou, Sebastiaan van de Velde, Willy Baeyens, Yue Gao
The passive sampling technique of diffusive gradients in thin-film (DGT) is widely used to determine 1D profiles (using Chelex-100 resin) and 2D images (using suspended particulate reagent-iminodiacetate resin, abbreviated as SPR-IDA resin) of metals in sediment pore waters and in oxic/anoxic soils. However, when deployed in anoxic sediments with high metal concentrations, Fe and Mn concentrations determined with the Chelex-100 resin gel were ~ 5 times higher than concentrations measured with the SPR-IDA resin gel...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784360/determination-of-cadmium-in-sediments-by-diluted-hci-extraction-and-isotope-dilution-icp-ms
#11
Javier Terán-Baamonde, Rosa-María Soto-Ferreiro, Alatzne Carlosena, José-Manuel Andrade, Darío Prada
Isotope dilution ICP-MS is proposed to measure the mass fraction of Cd extracted by diluted HCl in marine sediments, using a fast and simple extraction procedure based on ultrasonic probe agitation. The 111 Cd isotope was added before the extraction to achieve isotope equilibration with native Cd solubilized from the sample. The parameters affecting trueness and precision of isotope ratio measurements were evaluated carefully and subsequently corrected in order to minimize errors; they were: detector dead time, spectral interferences, mass discrimination factor and optimum sample/spike ratio...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784355/highly-selective-and-sensitive-chemiluminescence-biosensor-for-adenosine-detection-based-on-carbon-quantum-dots-catalyzing-luminescence-released-from-aptamers-functionalized-graphene-magnetic-%C3%AE-cyclodextrin-polymers
#12
Yuanling Sun, Chaofan Ding, Yanna Lin, Weiyan Sun, Hao Liu, Xiaodong Zhu, Yuxue Dai, Chuannan Luo
In this work, a highly selective and sensitive chemiluminescence (CL) biosensor was prepared for adenosine (AD) detection based on carbon quantum dots (CQDs) catalyzing the CL system of luminol-H2 O2 under alkaline environment and CQDs was released from the surface of AD aptamers functionalized graphene @ magnetic β-cyclodextrin polymers (GO@Fe3 O4 @β-CD@A-Apt). Firstly, GO@Fe3 O4 @β-CD and CQDs were prepared and characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), UV-Vis absorption spectra (UV), fluorescence spectra (FL), fourier transform infrared (FTIR) and X-ray powder diffraction (XRD)...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784335/gas-phase-complexation-of-%C3%AE-%C3%AE-cyclodextrin-with-amino-acids-studied-by-ion-mobility-mass-spectrometry-and-molecular-dynamics-simulations
#13
Yinjuan Chen, Zhicheng Zuo, Xinhua Dai, Peng Xiao, Xiang Fang, Xuefeng Wang, Wenning Wang, Chuan-Fan Ding
Cyclodextrins (CDs) are a class of macrocyclic molecules that have exhibited many promising applications in various fields. The knowledge of the complexation modes and recognition mechanisms of CDs with their guests are of paramount importance for rational design of more variants with controlled properties. Herein we investigated the binding conformations and the structural characteristics of α-/β-CD with three amino acids (AA, AA=Gly, L-Leu, L-Phe) in the gas phase by a combined experimental and computational approach...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784330/risk-assessment-model-for-different-foodstuff-drying-methods-via-ahp-fce-method-a-case-study-of-coal-burning-fluorosis-area-of-yunan-and-guizhou-province-china
#14
Haixia Pu, Kunli Luo, Shixi Zhang
Fluorosis is still a serious public health problem in China according to our field investigation. Current foodstuff drying methods were studied to evaluate the state of foodstuff contamination, including burning mixed coal (MC)/coal washing wastes (CWWs)/lump coal (LC)/fuelwood/fine coal + fixing materials (FCFM)/CWWs + fixing materials (CFM) in open stove (OS), honeycomb briquettes (HB) in improved stove (IS), sun-drying. The results demonstrate that elemental contents of F, As, Cd, Cr and Pb in roasted grain were 1...
October 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29784325/determination-of-toxic-elements-in-yerba-mate-by-icp-ms-after-diluted-acid-digestion-under-o-2-pressure
#15
Renan B Pardinho, Paula Dalla Vecchia, Ana L G Mendes, Cezar A Bizzi, Paola A Mello, Fabio A Duarte, Erico M M Flores
In this work, a procedure allowing effective digestion of a high mass of yerba mate (up to 1500 mg) using diluted HNO3, in a system pressurized with oxygen, is proposed. Digests were suitable for direct analysis by ICP-MS, virtually free of interferences. Digestion was performed using 7 mol l-1 HNO3 and 8 bar O2 . The digestion efficiency was better than 92% and digests presented a relatively low acidity (<10 mmol HNO3 ). The limit of quantification was 4.0, 1.0 and 1.0 ng g-1 for As, Cd and Pb, respectively...
October 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29784314/identification-of-new-diterpene-esters-from-green-arabica-coffee-beans-and-their-platelet-aggregation-accelerating-activities
#16
Xia Wang, QianQian Meng, XingRong Peng, GuiLin Hu, MingHua Qiu
Eight new ent-kaurane diterpene fatty acid esters, namely caffarolides A-H (1-8), were isolated from green beans of Coffea arabica. Their chemical structures were confirmed by extensive spectroscopic analysis including 1D, 2D NMR (HSQC, HMBC, 1 H-1 H COSY, and ROESY), HRMS, IR and CD spectra and by GC-FID analysis. Interestingly, the diterpene moiety of these new compounds first occurred in genus Coffea. All the isolates were evaluated for platelet aggregation activity in vitro. As the results, caffarolides C, D and F (3, 4 and 6) showed induction effect for platelet aggregation and the possible structure-activity relationships have been discussed briefly...
October 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29783785/effects-of-pb-smelting-on-the-soil-bacterial-community-near-a-secondary-lead-plant
#17
Zhanbin Luo, Jing Ma, Fu Chen, Xiaoxiao Li, Shaoliang Zhang
Secondary lead smelting is a widespread industrial activity which has exacerbated Pb or Cd contamination of soil and water across the world. Soil physicochemical properties, soil enzyme activities, heavy metal concentrations, and bacterial diversity near a secondary lead plant in Xuzhou, China were examined in this study. The results showed that secondary lead smelting activities influenced nearby soils. Soil acidification decreased one order of magnitude, with a mean value of 7.3. Soil organic matter also showed a downward trend, while potassium and nitrogen appeared to accumulate...
May 20, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29783784/cyclodextrins-assessing-the-impact-of-cavity-size-occupancy-and-substitutions-on-cytotoxicity-and-cholesterol-homeostasis
#18
Lajos Szente, Ashutosh Singhal, Andras Domokos, Byeongwoon Song
Cyclodextrins (CDs) are cyclic oligosaccharides; the most common CDs contain six, seven, or eight glucose units called α-CDs, β-CDs, and γ-CDs, respectively. The use of CDs in biomedical research is increasing due to their ability to interact with membrane lipids as well as a wide variety of poorly water-soluble molecules. We assessed the impact of CD cavity size, occupancy, and substitutions on cytotoxicity and cholesterol homeostasis. The potency of CD-mediated cytotoxicity was in the order of β-CDs, α-CDs, and γ-CDs...
May 20, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29783275/assessment-of-likelihood-ratio-for-four-contact-dermatitis-symptoms-of-vinca-minor
#19
Suman Bagchi, Chaturbhuja Nayak, Lex Rutten, Munmun Koley, Subhranil Saha, Mousumi Roy, Sk Jahir Abbas, Simantini Ghosh, Suman Halder, Ghulam Nabi Wani, Anaitulah Ahmad Mir, Showket Ahmad Bhat
BACKGROUND:  Contact dermatitis (CD) is a frequently occurring medical condition, for which Vinca minor (VM) is one of the recommended homeopathic medicines. However, the symptoms indicating this medicine have not yet been assessed systematically. Likelihood ratio (LR), based on Bayesian statistics, may yield better estimation of a medicine's indication than the existing method of entry of symptoms into materia medica and repertories. METHODS:  We investigated LRs of four CD symptoms of VM: (1) great sensitiveness of skin, with redness and soreness from slightest rubbing; (2) weeping eczema with foul, thick crusts; (3) itching amelioration in open air; and (4) CD of scalp...
May 21, 2018: Homeopathy: the Journal of the Faculty of Homeopathy
https://www.readbyqxmd.com/read/29783232/peculiarities-of-crohn-s-disease-in-children-the-way-from-diagnosis-verification-to-the-development-of-complications-clinical-case
#20
Tetyana O Kryuchko, Olha A Poda, Inna M Nesina, Vira P Harshman
OBJECTIVE: Introduction: Despite increasing frequency of inflammatory diseases of the intestine in the children worldwide, verification of Crohn's disease (CD) diagnosis in pediatric practice has not studied yet and it is difficult for clinician to determine the stage of the disease. The aim of our study was to analyze clinical case of Crohn's disease (CD) in a child based on literature data and own monitoring. PATIENTS AND METHODS: Materials and methods: 13 year old patient was involved in our examination who took complex lab and instrumental investigation, which allows verifying inflammatory intestinal pathology such as Crohn's disease...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
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