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https://www.readbyqxmd.com/read/28742986/adsorption-of-mesitylene-via-mesoporous-adsorbents
#1
Kai Chun Nien, Feng Tang Chang, Moo Been Chang
Mesitylene (or 1,3,5-trimethylbenzene) is a volatile organic compound emitted from various industrial processes, e.g., spray coating. Its emissions have become a critical issue because mesitylene is toxic and cannot be removed using traditional adsorbents, e.g., zeolite (H-ZSM-5; the diameter of mesitylene molecules is greater than the pore size of H-ZSM-5). Hence, an adsorbent with a large pore size, MCM-41, is used in this study to investigate its adsorption capacity for mesitylene and is compared with that of H-ZSM-5...
July 25, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28733004/study-on-thermal-mechanical-and-adsorption-properties-of-amine-functionalized-mcm-41-pmma-and-mcm-41-ps-nanocomposites-prepared-by-ultrasonic-irradiation
#2
Gholamhossein Mohammadnezhad, Saeed Abad, Roozbeh Soltani, Mohammad Dinari
In this study, two common industrial polymers, poly(methyl methacrylate) (PMMA) and polystyrene (PS), were incorporated into amine-functionalized MCM-41 mesoporous silica as reinforcement agents via an ultrasonic assisted method as a facile, fast, eco-friendly, and versatile synthetic tool. Amino functionalization of MCM-41 were performed by 3-aminopropyl triethoxysilane as a coupling agent and it is denoted as APTS-MCM-41. The obtained nanocomposites (NCs), APTS-MCM-41/PMMA and APTS-MCM-41/PS, were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM and TEM), and thermogravimetric analysis (TGA)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732205/unique-roles-of-the-non-identical-mcm-subunits-in-dna-replication-licensing
#3
REVIEW
Yuanliang Zhai, Ningning Li, Hanlun Jiang, Xuhui Huang, Ning Gao, Bik Kwoon Tye
A family of six homologous subunits, Mcm2, -3, -4, -5, -6, and -7, each with its own unique features, forms the catalytic core of the eukaryotic replicative helicase. The necessity of six similar but non-identical subunits has been a mystery since its initial discovery. Recent cryo-EM structures of the Mcm2-7 (MCM) double hexamer, its precursors, and the origin recognition complex (ORC)-Cdc6-Cdt1-Mcm2-7 (OCCM) intermediate showed that each of these subunits plays a distinct role in orchestrating the assembly of the pre-replication complex (pre-RC) by ORC-Cdc6 and Cdt1...
July 20, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28729513/bidirectional-eukaryotic-dna-replication-is-established-by-quasi-symmetrical-helicase-loading
#4
Gideon Coster, John F X Diffley
Bidirectional replication from eukaryotic DNA replication origins requires the loading of two ring-shaped minichromosome maintenance (MCM) helicases around DNA in opposite orientations. MCM loading is orchestrated by binding of the origin recognition complex (ORC) to DNA, but how ORC coordinates symmetrical MCM loading is unclear. We used natural budding yeast DNA replication origins and synthetic DNA sequences to show that efficient MCM loading requires binding of two ORC molecules to two ORC binding sites...
July 21, 2017: Science
https://www.readbyqxmd.com/read/28708622/synthesis-of-zno-cuo-mcm-48-photocatalyst-for-the-degradation-of-organic-pollutions
#5
Yongzheng Duan, Yulian Shen
The photocatalytic properties of ZnO-CuO catalysts supported on siliceous MCM-48 (Mobil Composition of Matter No. 48) for the degradation of organic pollutions such as methylene blue and salicylic acid under UV light irradiation were investigated. These catalysts were prepared by impregnation of MCM-48 with a mixed aqueous solution of copper acetate and zinc acetate. X-ray diffraction, N2-physisorption, high resolution transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and photoluminescence were used to characterize these samples...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28702279/the-utilization-of-selenocysteine-trna-ser-sec-isoforms-is-regulated-in-part-at-the-level-of-translation-in-vitro
#6
Bradley A Carlson, Nirupama Gupta, Mark H Pinkerton, Dolph L Hatfield, Paul R Copeland
The tRNA for the 21st proteinogenic amino acid, selenocysteine, exists in mammalian cells as 2 isoforms differing by a single 2'-O-methylribosyl moiety at position 34 (Um34). These isoforms contain either 5-methoxycarbonylmethyluridine (mcm(5)U) or 5-methoxycarbonylmethyl-2'-O-methyluridine (mcm(5)Um) at position 34. The accumulation of the mcm(5)Um isoform is tightly correlated with the expression of nonessential "stress response" selenoproteins such as glutathione peroxidase 1 (GPX1). The expression of essential selenoproteins, such as thioredoxin reductase 1 (TXNRD1), is not affected by changes in Sec-tRNA([Ser]Sec) isoform accumulation...
2017: Translation
https://www.readbyqxmd.com/read/28693344/ultrasound-mediated-drug-delivery-by-gas-bubbles-generated-from-a-chemical-reaction
#7
Sungmun Lee, Leena Al-Kaabi, Aurélie Mawart, Ahsan Khandoker, Habiba Alsafar, Herbert F Jelinek, Kinda Khalaf, Ji-Ho Park, Yeu-Chun Kim
Highly echogenic and ultrasound-responsive microbubbles such as nitrogen, and perfluorocarbons have been exploited as ultrasound-mediated drug carriers. Here, we propose an innovative method for drug delivery using microbubbles generated from a chemical reaction. In a novel drug delivery system, luminol encapsulated in folate-conjugated bovine serum albumin nanoparticles (Fol-BSAN) can generate nitrogen gas (N2) by chemical reaction when it reacts with hydrogen peroxide (H2O2), one of reactive oxygen species (ROS)...
July 11, 2017: Journal of Drug Targeting
https://www.readbyqxmd.com/read/28684278/zeta-potential-changing-self-emulsifying-drug-delivery-systems-containing-phosphorylated-polysaccharides
#8
Janine Griesser, Stephanie Burtscher, Saskia Köllner, Isabelle Nardin, Felix Prüfert, Andreas Bernkop-Schnürch
AIM: The aim of the study was to develop novel zeta potential changing self-emulsifying drug delivery systems (SEDDS) containing phosphorylated polysaccharides. METHODS: Starch and hydroxypropyl starch (HPS) were phosphorylated by utilizing phosphorus pentoxide. The modified starches, starch phosphate (SP) and hydroxypropyl starch phosphate (HPSP), were loaded into SEDDS and investigated regarding particle size, zeta potential, stability and cell viability. The release of immobilized phosphate by intestinal alkaline phosphatase (IAP) was analyzed via malachite green assay...
July 3, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28678498/oxidation-of-methane-to-methanol-over-single-site-palladium-oxide-species-on-silica-a-mechanistic-view-from-dft
#9
Anis Gannouni, Françoise Delbecq, Mongia Saïd Zina, Philippe Sautet
A theoretical analysis was carried out on the mechanism of methane oxidation to methanol occurring on single site palladium oxide species [PdO](2+) supported on a model of Al-MCM-41 silica. Both 6- and 8-membered ring structures were considered to represent the support. The energy profile for each elementary reaction was determined from density functional theory calculations with the OPBE functional. The calculated overall activation energies are close to the experimental values. Our calculations confirm that spin inversion can play a significant role in decreasing the barrier heights for the pathways...
July 27, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28667859/global-concentration-additivity-and-prediction-of-mixture-toxicities-taking-nitrobenzene-derivatives-as-an-example
#10
Tong Li, Shu-Shen Liu, Rui Qu, Hai-Ling Liu
The toxicity of a mixture depends not only on the mixture concentration level but also on the mixture ratio. For a multiple-component mixture (MCM) system with a definite chemical composition, the mixture toxicity can be predicted only if the global concentration additivity (GCA) is validated. The so-called GCA means that the toxicity of any mixture in the MCM system is the concentration additive, regardless of what its mixture ratio and concentration level. However, many mixture toxicity reports have usually employed one mixture ratio (such as the EC50 ratio), the equivalent effect concentration ratio (EECR) design, to specify several mixtures...
June 28, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28659738/rosmarinic-acid-suppresses-adipogenesis-lipolysis-in-3t3-l1-adipocytes-lipopolysaccharide-stimulated-tumor-necrosis-factor-%C3%AE-secretion-in-macrophages-and-inflammatory-mediators-in-3t3-l1-adipocytes
#11
Yehua Rui, Lingxia Tong, Jinbo Cheng, Guiping Wang, Liqiang Qin, Zhongxiao Wan
Background: Rosmarinic acid (RA) is a natural phenol carboxylic acid with many promising biological effects. It may be a suitable candidate for improving obesity-related adipose tissue dysfunction. Objective: We aimed to investigate the therapeutic use of RA as an anti-obesity agent by measuring its effects on adipogenesis, lipolysis, and messenger RNA (mRNA) expression of major adipokines in 3T3-L1 adipocytes; and its effects on lipopolysaccharide (LPS)-induced tumor necrosis factor-α (TNF-α) secretion in macrophages and inflammatory mediators in 3T3-L1 adipocytes incubated with macrophage-conditioned medium (MCM)...
2017: Food & Nutrition Research
https://www.readbyqxmd.com/read/28650837/heterogeneous-face-recognition-by-margin-based-cross-modality-metric-learning
#12
Jing Huo, Yang Gao, Yinghuan Shi, Wanqi Yang, Hujun Yin
Heterogeneous face recognition deals with matching face images from different modalities or sources. The main challenge lies in cross-modal differences and variations and the goal is to make cross-modality separation among subjects. A margin-based cross-modality metric learning (MCM²L) method is proposed to address the problem. A cross-modality metric is defined in a common subspace where samples of two different modalities are mapped and measured. The objective is to learn such metrics that satisfy the following two constraints...
June 26, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28650502/zipf-s-law-for-pore-ranking-and-pore-anisotropy
#13
Philippos Pomonis, Antigoni Margellou
In this work it is shown that the range of Zipf's law for the ranking of random pores in solids upholds for ∼10 orders of magnitude, from nm pore sizes in laboratory-made materials, to cm pore sizes occurring in solidified volcanic magmas. Also it is demonstrated that for MCM-type materials with organized mesopores, the out-of-trend data in the Zipf plots, corresponding to the sudden pore filling during N2 adsorption, can be used for the convenient estimation of local pore anisotropy.
June 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28643783/cdt1-stabilizes-an-open-mcm-ring-for-helicase-loading
#14
Jordi Frigola, Jun He, Kerstin Kinkelin, Valerie E Pye, Ludovic Renault, Max E Douglas, Dirk Remus, Peter Cherepanov, Alessandro Costa, John F X Diffley
ORC, Cdc6 and Cdt1 act together to load hexameric MCM, the motor of the eukaryotic replicative helicase, into double hexamers at replication origins. Here we show that Cdt1 interacts with MCM subunits Mcm2, 4 and 6, which both destabilizes the Mcm2-5 interface and inhibits MCM ATPase activity. Using X-ray crystallography, we show that Cdt1 contains two winged-helix domains in the C-terminal half of the protein and a catalytically inactive dioxygenase-related N-terminal domain, which is important for MCM loading, but not for subsequent replication...
June 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28640197/mesoporous-silica-matrix-as-a-tool-for-minimizing-dipolar-interactions-in-nife%C3%A2-o%C3%A2-and-znfe%C3%A2-o%C3%A2-nanoparticles
#15
Maider Virumbrales, Regino Saez-Puche, María José Torralvo, Veronica Blanco-Gutierrez
NiFe₂O₄ and ZnFe₂O₄ nanoparticles have been prepared encased in the MCM (Mobile Composition of Matter) type matrix. Their magnetic behavior has been studied and compared with that corresponding to particles of the same composition and of a similar size (prepared and embedded in amorphous silica or as bare particles). This study has allowed elucidation of the role exerted by the matrix and interparticle interactions in the magnetic behavior of each ferrite system. Thus, very different superparamagnetic behavior has been found in ferrite particles of similar size depending on the surrounding media...
June 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28639534/synthesis-of-bioadditives-of-fuels-from-biodiesel-derived-glycerol-by-esterification-with-acetic-acid-on-solid-catalysts
#16
Gabriel A Bedogni, Mauro D Acevedo, Federico Aguzín, Nora B Okulik, Cristina L Padró
In this paper, glycerol esterification with acetic acid was studied on several solid acid catalysts: Al2O3, Al-MCM-41, HPA/SiO2, HBEA, Amberlyst-15 and Amberlyst-36 with the aim of determining the reaction conditions and the nature of the surface acid sites required to produce selectively triacetylglycerol (triacetin). The acidity of the catalysts (nature, density and strength of acid sites) was characterized by temperature programmed desorption of NH3 and FTIR of adsorbed pyridine. Al2O3 (Lewis acidity) did not show any activity in the reaction...
June 22, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28628830/breviscapine-bvp-inhibits-prostate-cancer-progression-through-damaging-dna-by-minichromosome-maintenance-protein-7-mcm-7-modulation
#17
Yang-Bo Guan, Dong-Rong Yang, Shao-Jun Nong, Jian Ni, Chun-Hui Hu, Jian Li, Jin Zhu, Yu-Xi Shan
Naturally occurring compounds are reported as effective candidates for prevention and treatment of various cancers. Breviscapine (BVP) is a mixture of flavonoid glycosides, derived from the Chinese herbs. Previous researches have indicated that BVP has comprehensive pharmacological functions. However, little is known about whether BVP has preventive effects on human prostate cancer. Here, we attempted to explore if BVP inhibits human prostate cancer in vitro and in vivo in a comprehensive manner. We found that BVP triggered cytotoxicity in prostate cancer cell lines dose-dependently...
June 16, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28621911/different-roles-of-cd4-cd8-and-%C3%AE-%C3%AE-t-lymphocytes-in-naive-and-vaccinated-chickens-during-s-enteritidis-infection
#18
Zuzana Sekelova, Ondrej Polansky, Hana Stepanova, Radek Fedr, Marcela Faldynova, Ivan Rychlik, Lenka Vlasatikova
Lymphocytes represent the key antigen-specific leukocyte subpopulation. Despite their importance in mounting an immune response, an unbiased description of proteins expressed by chicken lymphocytes has not been presented. In this study we therefore intravenously infected chickens with Salmonella Enteritidis, sorted CD4, CD8 and γδ T-lymphocytes from the spleen by flow cytometry and determined the proteome of each population by LC-MS/MS. CD4 T-lymphocyte characteristic proteins included ubiquitin SUMO-like domain and BAR domain containing proteins...
June 16, 2017: Proteomics
https://www.readbyqxmd.com/read/28617581/creating-an-optimal-microenvironment-within-mesoporous-silica-mcm-41-for-capture-of-tobacco-specific-nitrosamines-tsna-in-solution
#19
Shuo Hao Li, Xiaodan Sun, Yang-Zhong Wang, Zhi-Peng Wang, Wen-Bo Gu, Wei-Miao Wang, He-Ming Yao, Ying Wang, Jian Hua Zhu
To meet the requirement of capturing tobacco specific nitrosamines (TSNA) in environment protection, a unique micro-environment was carefully created inside the channel of mesoporous silica MCM-41. In situ carbonization of template micelles at 923 K combined with the excess aluminum used in one-pot synthesis of MCM-41 are adopted to tailor the tortuosity of mecsoporous channels, while loaded metal oxides (5 wt.-%) and the Al-component in framework are employed to exert the necessary electrostatic interaction towards the target carcinogens TSNA in solution...
June 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28609726/removal-of-tetracycline-from-aqueous-solution-by-mcm-41-zeolite-a-loaded-nano-zero-valent-iron-synthesis-characteristic-adsorption-performance-and-mechanism
#20
Yige Guo, Wenli Huang, Bin Chen, Ying Zhao, Dongfang Liu, Yu Sun, Bin Gong
In this study, nano zero valent iron (NZVI) modified MCM-41-zeolite A (Fe-MCM-41-A) composite as a novel adsorbent was prepared by precipitation method and applied for tetracycline (TC) removal from aqueous solution. The adsorbent was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and N2-BET analysis. Hysteresis loops indicated that the sample has a desirable magnetic property and can be separated quickly...
June 6, 2017: Journal of Hazardous Materials
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