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https://www.readbyqxmd.com/read/28325108/relationship-between-water-structure-and-properties-of-poly-methyl-methacrylate-b-2-hydroxyethyl-methacrylate-by-solid-state-nmr
#1
Akira Mochizuki, Yuko Miwa, Riko Miyoshi, Takahiro Namiki
We previously reported that the platelet compatibility of methyl methacrylate (MMA)-2-hydroxyethyl methacrylate (HEMA) diblock copolymers is related to the characteristic water structure in the copolymer, as the copolymer has an excess amount of nonfreezing water when compared with that estimated from the amounts of water in HEMA and MMA homopolymers. Thus, in this study, the relationship between water structure and polymer structure, including the heterogeneity and mobility of the copolymer, was investigated using differential scanning calorimetry (DSC) and nuclear magnetic resonance (NMR) spectroscopy...
March 22, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28320622/heavy-metal-concentrations-and-arsenic-speciation-in-animal-manure-composts-in-china
#2
Xinping Yang, Qian Li, Zhu Tang, Wenwen Zhang, Guanghui Yu, Qirong Shen, Fang-Jie Zhao
A nationwide survey of animal manure-based composts was carried out in China. Two hundred and twelve samples were collected and analyzed for the concentrations of 9 heavy metals or metalloids and arsenic (As) speciation. The concentrations of heavy metals vary widely (Zn 11.8-3692, Cu 3.6-916, Cr 0.7-6603, Ni 0.7-73, Pb 0.05-189, As 0.4-72, Co 0.1-94, Cd 0.01-8.7 and Hg 0.01-1.9mgkg(-1) dry weight). Compared with the maximum permissible values of the Chinese standard for organic fertilizers, 13.7% and 2.4% of the composts exceeded the limits for As (15mgkg(-1)) and Cd (3mgkg(-1)), respectively...
March 17, 2017: Waste Management
https://www.readbyqxmd.com/read/28315235/identification-and-quantitation-of-malonic-acid-biomarkers-of-in-born-error-metabolism-by-targeted-metabolomics
#3
Chandra Shekar R Ambati, Furong Yuan, Lutfi A Abu-Elheiga, Yiqing Zhang, Vivekananda Shetty
Malonic acid (MA), methylmalonic acid (MMA), and ethylmalonic acid (EMA) metabolites are implicated in various non-cancer disorders that are associated with inborn-error metabolism. In this study, we have slightly modified the published 3-nitrophenylhydrazine (3NPH) derivatization method and applied it to derivatize MA, MMA, and EMA to their hydrazone derivatives, which were amenable for liquid chromatography- mass spectrometry (LC-MS) quantitation. 3NPH was used to derivatize MA, MMA, and EMA, and multiple reaction monitoring (MRM) transitions of the corresponding derivatives were determined by product-ion experiments...
March 17, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28314303/enhanced-recovery-after-surgery-programs-for-laparoscopic-colorectal-resection-may-not-need-thoracic-epidural-analgesia
#4
Ken Eto, Ichiro Kondo, Makoto Kosuge, Masahisa Ohkuma, Koichiro Haruki, Kai Neki, Hiroshi Sugano, Ryosuke Hashizume, Katsuhiko Yanaga
BACKGROUND/AIM: The aim of this study was to evaluate the necessity of thoracic epidural analgesia (TEA) as enhanced recovery after surgery (ERAS) programs for laparoscopic colorectal surgery (LC). PATIENTS AND METHODS: We retrospectively compared between perioperative outcomes of patients who underwent LC with TEA (n=31) and with multimodal analgesia (MMA) (n=31). Furthermore, we also evaluated the patients' satisfaction by a questionnaire survey to the nurses...
March 2017: Anticancer Research
https://www.readbyqxmd.com/read/28304370/identification-of-dimethylamine-monooxygenase-in-marine-bacteria-reveals-a-metabolic-bottleneck-in-the-methylated-amine-degradation-pathway
#5
Ian Lidbury, Michaela A Mausz, David J Scanlan, Yin Chen
Methylated amines (MAs) are ubiquitous in the marine environment and their subsequent flux into the atmosphere can result in the formation of aerosols and ultimately cloud condensation nuclei. Therefore, these compounds have a potentially important role in climate regulation. Using Ruegeria pomeroyi as a model, we identified the genes encoding dimethylamine (DMA) monooxygenase (dmmABC) and demonstrate that this enzyme degrades DMA to monomethylamine (MMA). Although only dmmABC are required for enzyme activity in recombinant Escherichia coli, we found that an additional gene, dmmD, was required for the growth of R...
March 17, 2017: ISME Journal
https://www.readbyqxmd.com/read/28300497/bond-strength-of-stainless-steel-orthodontic-brackets-bonded-to-prefabricated-acrylic-teeth
#6
Wan Salbiah Wan Abdul Razak, Martyn Sherriff, Dirk Bister, Jadbinder Seehra
OBJECTIVES: The purpose of this in-vitro study was to evaluate the force to debond stainless steel orthodontic brackets bonded to acrylic teeth using different combinations of adhesive and surface treatments. MATERIALS AND METHODS: One hundred prefabricated upper lateral incisor acrylic teeth were divided into 4 equal groups: Transbond XT® adhesive only (Group 1, control), Transbond XT® adhesive with sandblasting (Group 2), Transbond XT® adhesive with abrasion / + methyl methacrylate (MMA) (Group 3) and Triad® Gel only (Group 4)...
March 16, 2017: Journal of Orthodontics
https://www.readbyqxmd.com/read/28294352/comparison-of-grain-to-grain-orientation-and-stiffness-mapping-by-spatially-resolved-acoustic-spectroscopy-and-ebsd
#7
A F Mark, W Li, S Sharples, P J Withers
Our aim was to establish the capability of spatially resolved acoustic spectroscopy (SRAS) to map grain orientations and the anisotropy in stiffness at the sub-mm to micron scale by comparing the method with electron backscatter diffraction (EBSD) undertaken within a scanning electron microscope. In the former the grain orientations are deduced by measuring the spatial variation in elastic modulus; conversely, in EBSD the elastic anisotropy is deduced from direct measurements of the crystal orientations. The two test-cases comprise mapping the fusion zones for large TIG and MMA welds in thick power plant austenitic and ferritic steels, respectively; these are technologically important because, among other things, elastic anisotropy can cause ultrasonic weld inspection methods to become inaccurate because it causes bending in the paths of sound waves...
March 15, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28286913/laser-performance-of-some-oxazole-laser-dyes-in-restricted-matrices
#8
Mahmoud A S Sakr, Sayed A Abdel Gawad, Maram T H Abou Kana, El-Zeiny M Ebeid
This article reports the optical properties such as absorption profile, molar absorptivity, fluorescence profile and photo-physical parameters such as dipole moment, oscillator strength, fluorescence quantum yields, fluorescence lifetimes, laser performance and finally photostability of 2,5-Bis(5-tert-butyl-benzoxazol-2-yl)thiophene (BBOT),1,4-Bis(5-phenyl-2-oxazolyl)benzene (POPOB), 5-diphenyel-oxazole (PPO) laser dyes in different restricted hosts. (BBOT), (POPOB) and (PPO) are embedded in transparent silica-based nanoporous sol-gel glass and copolymer matrix of methyl methacrylate (MMA) and 2-hydroxyethyl methacrylate (HEMA)...
March 13, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28285078/biodegradable-inorganic-organic-hybrids-of-methacrylate-star-polymers-for-bone-regeneration
#9
Justin J Chung, Yuki Fujita, Siwei Li, Molly M Stevens, Toshihiro Kasuga, Theoni K Georgiou, Julian R Jones
Hybrids that are molecular scale co-networks of organic and inorganic components are promising biomaterials, improving the brittleness of bioactive glass and the strength of polymers. Methacrylate polymers have high potential as the organic source for hybrids since they can be produced, through controlled polymerization, with sophisticated polymer architectures that can bond to silicate networks. Previous studies showed the mechanical properties of hybrids can be modified by polymer architecture and molar mass (MM)...
March 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28281245/medicare-modernization-and-diffusion-of-endoscopy-in-ffs-medicare
#10
Lee R Mobley, Pedro Amaral, Tzy-Mey Kuo, Mei Zhou, Srimoyee Bose
OBJECTIVE: To examine how FFS Medicare utilization of endoscopy procedures for colorectal cancer (CRC) screening changed after implementation of the Medicare Prescription Drug, Improvement, and Modernization Act (MMA) in 2006, which provided subsidized drug coverage and expanded the geographic availability of Medicare managed care plans across the US. DATA SOURCES/STUDY SETTING: Using secondary data from 100% FFS Medicare enrollees, we analyzed endoscopy utilization during two intervals, 2001-2005 and 2006-2009...
December 2017: Health Economics Review
https://www.readbyqxmd.com/read/28276279/the-immune-stimulation-capacity-of-liposome-treated-red-blood-cells
#11
Luciana da Silveira Cavalcante, Donald R Branch, Trang T Duong, Rae S M Yeung, Jason P Acker, Jelena L Holovati
Our in vivo studies on a rat model established safety of transfusing liposome-treated red blood cells (RBCs) but identified the potential for immune modulation as related to transfusion efficacy of liposome-treated RBCs. The aim of this study was at assessing the impact of liposome-induced membrane changes on the immune profile of liposome-treated RBCs by (a) evaluating their interaction with endothelial cells and monocytes; and (b) the resulting immune response derived from this interaction, in the form of cytokine release, adhesion molecules expression and phagocytosis...
March 9, 2017: Journal of Liposome Research
https://www.readbyqxmd.com/read/28275169/mode-of-gh-administration-and-gene-expression-in-the-female-rat-brain
#12
Marion Walser, Linus Schiöler, Jan Oscarsson, Maria A I Åberg, Ruth Wickelgren, Johan Svensson, Jörgen Isgaard, N David Aberg
The endogenous secretion of growth hormone (GH) is sexually dimorphic in rats with females having a more even and males a more pulsatile secretion and low trough levels. The mode of GH administration, mimicking the sexually dimorphic secretion, has different systemic effects. In the brains of male rats, we have previously found that the mode of GH administration differently affects neuron haemoglobin beta (Hbb) expression whereas effects on other transcripts were moderate. The different modes of GH administration could have different effects on brain transcripts in female rats...
March 8, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28272997/relation-of-dietary-inorganic-arsenic-exposure-and-urinary-inorganic-arsenic-metabolites-excretion-in-japanese-subjects
#13
Tomoko Oguri, Jun Yoshinaga, Yayoi Suzuki, Hiroaki Tao, Tetsuya Nakazato
Inorganic arsenic (InAs) is a ubiquitous metalloid that has been shown to exert multiple adverse health outcomes. Urinary InAs and its metabolite concentration has been used as a biomarker of arsenic (As) exposure in some epidemiological studies, however, quantitative relationship between daily InAs exposure and urinary InAs metabolites concentration has not been well characterized. We collected a set of 24-h duplicated diet and spot urine sample of the next morning of diet sampling from 20 male and 19 female subjects in Japan from August 2011 to October 2012...
March 8, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28266584/arsenic-methylation-and-its-relationship-to-abundance-and-diversity-of-arsm-genes-in-composting-manure
#14
Weiwei Zhai, Mabel T Wong, Fei Luo, Muhammad Z Hashmi, Xingmei Liu, Elizabeth A Edwards, Xianjin Tang, Jianming Xu
Although methylation is regarded as one of the main detoxification pathways for arsenic (As), current knowledge about this process during manure composting remains limited. In this study, two pilot-scale compost piles were established to treat manure contaminated with As. An overall accumulation of methylated As occurred during 60 day-composting time. The concentration of monomethylarsonic acid (MMA) increased from 6 to 190 μg kg(-1) within 15 days and decreased to 35 μg kg(-1) at the end of the maturing phase; while the concentration of dimethylarsinic acid (DMA) continuously increased from 33 to 595 μg kg(-1) over the composting time...
March 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28258532/counterclockwise-maxillomandibular-advancement-a-choice-for-chinese-patients-with-severe-obstructive-sleep-apnea
#15
Silong Wei, Yong Zhang, Xiaojing Guo, Wenwen Yu, Meng Wang, Kan Yao, Hongxia Sun, Hua Zhang, Xiaofeng Lu
PURPOSE: Maxillomandibular advancement (MMA) is an effective alternative for treating severe obstructive sleep apnea (OSA). However, the promotion of MMA in China is limited by many Chinese patients having a convex facial profile. To achieve maximal upper airway enlargement without an esthetic disaster, we added counterclockwise rotation of the maxillomandibular complex (MMC) in the routine MMA. In this paper, we have evaluated the objective and subjective outcomes of this technology...
March 3, 2017: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/28254273/a-novel-route-to-prepare-a-multilayer-system-via-the-combination-of-interface-mediated-catalytic-chain-transfer-polymerization-and-thiol-ene-click-chemistry
#16
Adem Zengin, Tuncer Caykara
Herein, we have designed a novel multilayer system composed of poly(methyl methacrylate) [poly(MMA)] brush, biotin, streptavidin and protein-A on a silicon substrate to attach onanti-immunoglobulin G (anti-IgG). poly(MMA) brush with vinyl end-group was first synthesized by the interface-mediated catalytic chain transfer polymerization. The brush was then modified with cysteamine molecules to generate the polymer chains with amine end-group via a thiol-ene click chemistry. The amine end-groups of poly(MMA) chains were also modified with biotin units to ensure selective connection points for streptavidin molecules...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28249828/embolization-therapy-for-refractory-hemorrhage-in-patients-with-chronic-subdural-hematomas
#17
El Kim
OBJECTIVE: There is no definite operative procedure for patients with intractable chronic subdural hematoma (CSDH). The authors herein described the safety and efficacy of embolization treatment of the middle meningeal artery (MMA) for such cases. METHODS: Patients were divided into an embolization group (n=20) and a conventional group (n=23) based on the therapeutic approach to their CSDHs. Twenty-six recollected hematomas with increased risk of recurrence were the targets of the endovascular treatment...
February 26, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28246669/-leaching-or-not-leaching-an-alternative-approach-to-antimicrobial-materials-via-copolymers-containing-crown-ethers-as-active-groups
#18
M De Rosa, G Vigliotta, A Soriente, V Capaccio, G Gorrasi, R Adami, E Reverchon, M Mella, L Izzo
In this work, new copolymers containing either MMA and 18C6 crown-ether pendants, or PEG, MMA and 18C6 crown-ether pendants were synthesized to test the idea that sequestering structural alkali-earth ions from the bacterial outer membrane (OM) may lead to bacterial death. The copolymers were obtained either via uncontrolled radical polymerization or ATRP; the latter approached allowed us to produce not only linear copolymers but also branched Y-like structures. After checking for the capability of complexing magnesium and calcium ions, the antimicrobial activity of all copolymers was tested placing their casted plaques in contact with pure water E...
March 1, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28239393/thermo-sensitive-polymer-nanospheres-as-a-smart-plugging-agent-for-shale-gas-drilling-operations
#19
Wei-Ji Wang, Zheng-Song Qiu, Han-Yi Zhong, Wei-An Huang, Wen-Hao Dai
Emulsifier-free poly(methyl methacrylate-styrene) [P(MMA-St)] nanospheres with an average particle size of 100 nm were synthesized in an isopropyl alcohol-water medium by a solvothermal method. Then, through radical graft copolymerization of thermo-sensitive monomer N-isopropylacrylamide (NIPAm) and hydrophilic monomer acrylic acid (AA) onto the surface of P(MMA-St) nanospheres at 80 °C, a series of thermo-sensitive polymer nanospheres, named SD-SEAL with different lower critical solution temperatures (LCST), were prepared by adjusting the mole ratio of NIPAm to AA...
2017: Pet Sci
https://www.readbyqxmd.com/read/28235556/relation-of-polymorphism-of-arsenic-metabolism-genes-to-arsenic-methylation-capacity-and-developmental-delay-in-preschool-children-in-taiwan
#20
Ru-Lan Hsieh, Chien-Tien Su, Horng-Sheng Shiue, Wei-Jen Chen, Shiau-Rung Huang, Ying-Chin Lin, Ming-I Lin, Shu-Chi Mu, Ray-Jade Chen, Yu-Mei Hsueh
Inefficient arsenic methylation capacity has been associated with developmental delay in children. The present study was designed to explore whether polymorphisms and haplotypes of arsenic methyltransferase (AS3MT), glutathione-S-transferase omegas (GSTOs), and purine nucleoside phosphorylase (PNP) affect arsenic methylation capacity and developmental delay. A case-control study was conducted from August 2010 to March 2014. All participants were recruited from the Shin Kong Wu Ho-Su Memorial Teaching Hospital...
February 21, 2017: Toxicology and Applied Pharmacology
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