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https://www.readbyqxmd.com/read/28727988/environmental-exposures-and-pediatric-kidney-function-and-disease-a-systematic-review
#1
REVIEW
Laura Y Zheng, Alison P Sanders, Jeffrey M Saland, Robert O Wright, Manish Arora
BACKGROUND: Environmental chemical exposures have been implicated in pediatric kidney disease. No appraisal of the available evidence has been conducted on this topic. METHODS: We performed a systematic review of the epidemiologic studies that assessed association of environmental exposures with measures of kidney function and disease in pediatric populations. The search period went through July 2016. RESULTS: We found 50 studies that met the search criteria and were included in this systematic review...
July 17, 2017: Environmental Research
https://www.readbyqxmd.com/read/28723203/multicolor-functional-carbon-dots-via-one-step-refluxing-synthesis
#2
Ting-Yi Wang, Chong-You Chen, Chang-Ming Wang, Ying Zi Tan, Wei-Ssu Liao
Carbon dots are admirable fluorescent nanomaterials due to their low cost, high photostability, excellent biocompatibility, and environmental friendliness. Most conventional carbon dot fabrication approaches produce single-colored fluorescent material in the preparation process; different methods are therefore required to synthesize distinct carbon dots for specific optical applications. In this study, carbon dots carrying different emission colors are prepared through a one-step refluxing process. The emission of these materials can be well-tuned by sodium hydroxide content in the precursor solution...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28705579/melamine-poisoning-pediatric-urolithiasis-treatment-in-gansu-china-5-yrfollow-up-analysis
#3
Hong Chang, Gongjin Wu, Zhongjin Yue, Junhai Ma, Ze Qin
OBJECTIVES: To investigate the clinical characteristics of urolithiasis children retrospectively who ingested melamine-poisoned formula as infants and report a five-year follow-up analysis. METHODS: Clinical data on 207 patients (mean±SD, 13.6±8.0months) with melamine-induced urolithiasis were retrospectively analyzed. Patients were subdivided into two groups according to treatment. A five-year follow-up study was conducted with 95.7% (198/207) of the children...
July 10, 2017: Urology
https://www.readbyqxmd.com/read/28699298/tailored-design-of-bicontinuous-gyroid-mesoporous-carbon-and-nitrogen-doped-carbon-from-poly-ethylene-oxide-b-caprolactone-diblock-copolymers
#4
Shiao-Wei Kuo, Wei-Cheng Chu, Bishnu Prasad Bastakoti, Yusuf Valentino Kaneti, Jheng-Guang Li, Yusuke Yamauchi, Hatem R Alamri, Zeid A Alothman
Highly ordered mesoporous resol-type phenolic resin and the corresponding mesoporous carbon materials have been synthesized by using PEO-b-PCL diblock copolymer as a soft-template. The self-assembled mesoporous phenolic resin was found to form only at a specific resol concentration range of 40-70 wt% through the intriguing balance of hydrogen bonding interactions in the resol/PEO-b-PCL mixtures. Furthermore, the morphological transitions of the mesostructures from disordered to gyroid to cylindrical and finally to disordered micelle structure were observed with the increasing resol concentrations...
July 11, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28691825/small-molecule-recognition-triggers-secondary-and-tertiary-interactions-in-dna-folding-and-hammerhead-ribozyme-catalysis
#5
Jie Mao, Chris DeSantis, Dennis Bong
We have identified tris(2-aminoethyl)amine (tren)-derived scaffolds with two (t2M) or four (t4M) melamine rings that can target oligo T/U domains in DNA/RNA. Unstructured T-rich DNAs cooperatively fold with the tren derivatives to form hairpin-like structures. Both t2M and t4M act as functional switches in a family of hammerhead ribozymes deactivated by stem or loop replacement with a U-rich sequence. Catalysis of bond scission in these hammerhead ribozymes could be restored by putative t2M/t4M refolding of stem secondary structure or tertiary bridging interactions between loop and stem...
July 13, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28691485/single-drop-raman-imaging-exposes-the-trace-contaminants-in-milk
#6
Zong Tan, Tingting Lou, Zhixuan Huang, Jing Zong, Kexin Xu, Qifeng Li, Da Chen
Better milk safety control can offer important means to promote public health. However, few technologies can detect different types of contaminants in milk simultaneously. In this regard, the present work proposes a single-drop Raman imaging (SDRI) strategy for semi-quantitation of multiple hazardous factors in milk solutions. By developing SDRI strategy that incorporates coffee-ring effect (a natural phenomenon often presents in a condensed circle pattern after a drop evaporated) for sample pretreatment and discrete wavelet transform for spectra processing, the method serves well to expose typical hazardous molecular species in milk products, such as melamine, sodium thiocyanate and lincomycin hydrochloride, with little sample preparation...
July 10, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28675223/carbon-nanowalls-a-new-versatile-graphene-based-interface-for-the-laser-desorption-ionization-mass-spectrometry-detection-of-small-compounds-in-real-samples
#7
I S Hosu, M Sobaszek, M Ficek, R Bogdanowicz, H Drobecq, L Boussekey, A Barras, O Melnyk, R Boukherroub, Y Coffinier
Carbon nanowalls, vertically aligned graphene nanosheets, attract attention owing to their tunable band gap, high conductivity, high mechanical robustness, high optical absorbance and other remarkable properties. In this paper, we report for the first time the use of hydrophobic boron-doped carbon nanowalls (CNWs) for laser desorption/ionization of small compounds and their subsequent detection by mass spectrometry (LDI-MS). The proposed method offers sensitive detection of various small molecules in the absence of an organic matrix...
July 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28674450/triplex-dna-based-bioanalytical-platform-for-highly-sensitive-homogeneous-electrochemical-detection-of-melamine
#8
Xiaojuan Liu, Mengmeng Song, Feng Li
Melamine detection has attracted much attention since the discovery of the damage of melamine to human health. Herein, we have developed a sensitive homogeneous electroanalytical platform for melamine detection, which is relied on the formation of triplex molecular beacon integrated with exonuclease III (Exo III)-mediated signal amplification. The formation of triplex molecular beacon was triggered by the recognition and incorporation of melamine to the abasic (AP) site contained in the triplex stem. The stem of the triplex molecular beacon was designed to have a protruding double-strand DNA, which can be recognized and hydrolyzed by Exo III for releasing methylene blue (MB)-labeled mononucleotide...
July 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28636316/novel-melamine-o-phthalaldehyde-covalent-organic-frameworks-nanosheets-enhancement-flame-retardant-and-mechanical-performances-of-thermoplastic-polyurethanes
#9
Xiaowei Mu, Jing Zhan, Xiaming Feng, Bihe Yuan, Shuilai Qiu, Lei Song, Yuan Hu
Covalent organic frameworks (COFs) nanosheets prepared from condensation reaction between melamine and o-phthalaldehyde are first prepared through ball milling and then incorporated into thermoplastic polyurethanes (TPU) by solution mixing. Transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectrometer are applied to characterize COFs nanosheets. It is observed apparently from TEM image that COFs nanosheets are obtained...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28632318/-the-easier-the-better-preparation-of-efficient-photocatalysts-metastable-poly-heptazine-imide-salts
#10
Zupeng Chen, Aleksandr Savateev, Sergey Pronkin, Vasiliki Papaefthimiou, Christian Wolff, Marc Georg Willinger, Elena Willinger, Dieter Neher, Markus Antonietti, Dariya Dontsova
Cost-efficient, visible-light-driven hydrogen production from water is an attractive potential source of clean, sustainable fuel. Here, it is shown that thermal solid state reactions of traditional carbon nitride precursors (cyanamide, melamine) with NaCl, KCl, or CsCl are a cheap and straightforward way to prepare poly(heptazine imide) alkali metal salts, whose thermodynamic stability decreases upon the increase of the metal atom size. The chemical structure of the prepared salts is confirmed by the results of X-ray photoelectron and infrared spectroscopies, powder X-ray diffraction and electron microscopy studies, and, in the case of sodium poly(heptazine imide), additionally by atomic pair distribution function analysis and 2D powder X-ray diffraction pattern simulations...
June 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28622471/coacervate-of-polyacrylamide-and-cationic-gemini-surfactant-for-the-extraction-of-methyl-orange-from-aqueous-solution
#11
Weiwei Zhao, Yaxun Fan, Hua Wang, Yilin Wang
Coacervation in aqueous solution of the mixture of cationic ammonium surfactant hexamethylene-1,6-bis(dodecyldimethylammonium bromide) (12-6-12) and 10% hydrolyzed polyacrylamide (PAM) has been investigated. It was found that the 12-6-12/PAM mixture forms coacervate with a large network structure over a wide concentration range of surfactant and polyelectrolyte and shows great efficiency in the extraction of Methyl Orange (MO) from water owing to the cooperation of hydrophobic, electrostatic, and π-cation interactions...
June 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28621921/novel-polymer-aerogel-toward-high-dimensional-stability-mechanical-property-and-fire-safety
#12
Ke Shang, Jun-Chi Yang, Zhi-Jie Cao, Wang Liao, Yu-Zhong Wang, David A Schiraldi
Inorganc silica-based aerogels, the earliest and widely used aerogels, have poorer mechanical properties than their organic substitutes, which are flammable. In this study, a novel polymeric aerogel with high strength, inherent flame retardancy, and cost-effectiveness, which is based on poly(vinyl alcohol) (PVA) cross-linked with melamine-formaldehyde (MF), was prepared under aqueous condition with an ecofriendly freeze-drying and postcuring process. Combined with the additional rigid MF network and benifited from the resulting unique infrastructure of inter-cross-linked flexible PVA segments and rigid MF segments, PVA-based aerogels exibited a significantly decreased degradation rate and sharply decreased peak heat release rate (PHRR) in cone calorimeter tests (by as much as 83%) compared with neat PVA...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28617599/effects-of-the-adulteration-technique-on-the-near-infrared-detection-of-melamine-in-milk-powder
#13
Peter F Scholl, Marti Mamula Bergana, Betsy Jean Yakes, Zhuohong Xie, Steven Zbylut, Gerard Downey, Magdi Mossoba, Joseph Jablonski, Robert Magaletta, Stephen E Holroyd, Martin Buehler, Jianwei Qin, William Hurst, Joseph H LaPointe, Dean Roberts, Carol Zrybko, Andrew Mackey, Jason D Holton, Greg A Israelson, Anitra Payne, Moon S Kim, Kuanglin Chao, Jeffrey C Moore
The United States Pharmacopeial Convention has led an international collaborative project to develop a toolbox of screening methods and reference standards for the detection of milk powder adulteration. During the development of adulterated milk powder reference standards, blending methods used to combine melamine and milk had unanticipated strong effects on the near-infrared (NIR) spectrum of melamine. The prominent absorbance band at 1468 nm of melamine was retained when it was dry-blended with skim milk powder but disappeared in wet-blended mixtures, where spray-dried milk powder samples were prepared from solution...
July 6, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28615722/a-novel-simple-and-rapid-route-to-the-synthesis-of-boron-cabonitride-nanosheets-combustive-gaseous-unfolding
#14
Maisam Jalaly, Francisco José Gotor, Masih Semnan, María Jesús Sayagués
The ternary compound boron carbonitride (BCN) was synthesized in the form of few-layer nanosheets through a mechanically induced self-sustaining reaction (MSR). Magnesium was used to reduce boron trioxide in the presence of melamine in a combustive manner. The process to form the nanostructured material was very rapid (less than 40 min). The prepared powder was investigated by various techniques such as X-ray diffraction (XRD), Fourier Transform infrared (FTIR), Micro-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS)...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28614070/ultralight-fe-c-nanocapsules-sponge-composite-with-reversibly-tunable-microwave-absorption-performances
#15
Yixing Li, Zhe Mao, Rongge Liu, Xiaoning Zhao, Yanhui Zhang, Gaowu Qin, Xuefeng Zhang
Microwave absorbers are usually designed to solve electromagnetic interferences at a specific frequency, while the requirements may be dynamic during service life. Therefore, a recoverable tuning for microwave absorption properties in response to an external stimulus would be highly desirable. We herein present a micro/nano-scale hybrid absorber, in which high-performance Fe@C nanocapsule absorbents are integrated with a porous melamine sponge skeleton, exhibiting multiple merits of light weight, strong absorption and high elasticity...
June 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28601746/insight-into-the-localized-surface-plasmon-resonance-property-of-core-satellite-nanostructures-theoretical-prediction-and-experimental-validation
#16
Dongxing Song, Dengwei Jing
Regulation of the localized surface plasmon resonance (LSPR) of nanoparticles by changing the dielectric constant of the surrounding medium has been exploited in many practical applications. In this study, using Ag-nanodot-decorated SiO2 nanoparticles (Ag-decorated SiO2NPs) with different solvents, we investigated the potential of using such core-satellite nanostructures as a liquid sensor for the determination of melamine. The dielectric constant effect of the surrounding medium on the LSPR property was given particular attention...
June 3, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28574702/high-throughput-platform-for-synthesis-of-melamine-formaldehyde-microcapsules
#17
Seda Çakir, Erwin Bauters, Guadalupe Rivero, Tom Parasote, Johan Paul, Filip E Du Prez
The synthesis of microcapsules via in situ polymerization is a labor-intensive and time-consuming process, where many composition and process factors affect the microcapsule formation and its morphology. Herein, we report a novel combinatorial technique for the preparation of melamine-formaldehyde microcapsules, using a custom-made and automated high-throughput platform (HTP). After performing validation experiments for ensuring the accuracy and reproducibility of the novel platform, a design of experiment study was performed...
June 15, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28561583/preparation-of-a-novel-intumescent-flame-retardant-based-on-supramolecular-interactions-and-its-application-in-polyamide-11
#18
Xiaodong Jin, Jun Sun, Jessica Shiqing Zhang, Xiaoyu Gu, Serge Bourbigot, Hongfei Li, Wufei Tang, Sheng Zhang
The flammability and melt dripping of the widely used bio-based polyamide 11 (PA 11) have attracted much attention in the last decade, and they are still a big challenge for the fire science society. In this work, a novel single macromolecular intumescent flame retardant (AM-APP) that contains an acid source and a gas source was prepared by supramolecular reactions between melamine and p-aminobenzene sulfonic acid, followed by an ionic exchange with ammonium polyphosphate. The chemical structure of AM-APP was characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28541939/adsorption-kinetics-and-isotherm-of-vanadium-with-melamine
#19
Hao Peng, Zuohua Liu, Changyuan Tao
Melamine, possessing three free amino groups and three aromatic nitrogen atoms in its molecule, has great potential as an adsorbent for metal ions. We investigated three impact factors of the adsorption process: the initial pH of the vanadium solution, contact time and reaction temperature. The adsorption kinetics could be accurately described by the pseudo-second-order kinetic model. Langmuir and Freundlich models fitted well with the experimental equilibrium data, and the maximal adsorption capacity was found to be 1,428...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28538102/effects-of-wet-blending-on-detection-of-melamine-in-spray-dried-lactose
#20
Betsy Jean Yakes, Marti M Bergana, Peter F Scholl, Magdi M Mossoba, Sanjeewa R Karunathilaka, Luke K Ackerman, Jason D Holton, Boyan Gao, Jeffrey C Moore
During the development of rapid screening methods to detect economic adulteration, spray-dried milk powders prepared by dissolving melamine in liquid milk exhibited an unexpected loss of characteristic melamine features in the near-infrared (NIR) and Raman spectra. To further characterize this "wet-blending" phenomenon, spray-dried melamine and lactose samples were produced as a simplified model and investigated by NIR spectroscopy, Raman spectroscopy, proton nuclear magnetic resonance ((1)H NMR), and direct analysis in real time Fourier transform mass spectrometry (DART-FTMS)...
July 6, 2017: Journal of Agricultural and Food Chemistry
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