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https://www.readbyqxmd.com/read/28425316/carbon-covered-mesoporous-silica-and-its-application-in-rhodamine-b-adsorption
#1
R C S Nascimento, A O S Silva, L Meili
Modified versions of MCM-41 and SBA-15 were obtained from sucrose by carbon deposition. The ability of the resulting materials, MCM-41 CC and SBA-15 CC, to remove Rhodamine B from aqueous solutions was evaluated. TG/DTG, XRD, Nitrogen Adsorption (BET), and SEM were used to characterize the materials. Adsorption was investigated by finite bath studies. To characterize the adsorption behavior and mechanism, kinetics and equilibrium were assessed. MCM-41 CC provided the best adsorption results: adsorptive capacity of 11...
April 20, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28421461/the-role-of-tumor-board-conferences-in-neuro-oncology-a-nationwide-provider-survey
#2
REVIEW
James Snyder, Lonni Schultz, Tobias Walbert
The tumor board or multidisciplinary cancer meeting (MCM) is the foundation of high value multidisciplinary oncology care, coordinating teams of specialists. Little is known on how these meetings are implemented in Neuro-oncology. Benefits of MCMs include coordination, direction for complicated cases, education, and a forum for communication, emerging technology, and clinical trials. This study identifies participation and utilization of neuro-oncology MCMs. A cross-sectional descriptive survey was dispersed through an internet questionnaire...
April 18, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28416706/the-gan-exonuclease-or-the-flap-endonuclease-fen1-and-rnase-hii-are-necessary-for-viability-of-thermococcus-kodakarensis
#3
Brett W Burkhart, Lubomira Cubonova, Margaret R Heider, Zvi Kelman, John N Reeve, Thomas J Santangelo
Many aspects of and factors required for DNA replication are conserved across all three Domains of life but there are some significant differences surrounding lagging strand synthesis. In Archaea, a 5' to 3' exonuclease, related to both bacterial RecJ and eukaryotic Cdc45, that associates with the replisome specifically through interactions with GINS, was identified and designated GAN (for GINS-associated nuclease). Despite the presence of a well-characterized flap endonuclease (Fen1), it was hypothesized that GAN might participate in primer removal during Okazaki fragment maturation and, as a Cdc45 homologue, GAN might also be a structural component of an archaeal CMG (Cdc45, MCM, GINS) replication complex...
April 17, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28415395/drug-kinetics-release-from-eudragit-tenofovir-sioc-tablets
#4
A Tamayo, M A Mazo, M D Veiga, R Ruiz-Caro, F Notario-Pérez, J Rubio
A novel drug release system has been obtained in form of tablets from Eudragit® RS and tenofovir loaded on porous silicon oxycarbide glasses (SiOC). Active carbon (AC) and mesoporous silica (MCM-41) have also been used for comparative purposes. The porous silicon oxycarbide presents a bimodal mesopore size distribution that is maintained after functionalization with amino groups. We have studied the adsorption kinetics and adsorption equilibrium when the materials are loaded with tenofovir and, in all cases, pseudo-second order kinetics and Langmuir isotherm have been revealed as the most representative models describing the kinetic and thermodynamic parameters...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28411569/melamine-formaldehyde-derived-porous-carbons-for-adsorption-of-co2-capture
#5
Deepak Tiwari, Chitrakshi Goel, Haripada Bhunia, Pramod K Bajpai
In this work, we report carbon adsorbents obtained from high nitrogen content melamine-formaldehyde resin as starting material and mesoporous zeolite MCM-41 as template through nanocasting technique. To synthesize different carbon structure adsorbents with improved textural and surface properties, the material undergo carbonization followed by physical activation under CO2 atmosphere at different temperatures. Characterizations of the adsorbents using SEM, TEM, XPS, nitrogen sorption, CHN, TKN, and TPD have been carried out...
April 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28406584/thick-corpus-callosum-in-children
#6
Aviv Schupper, Osnat Konen, Ayelet Halevy, Rony Cohen, Sharon Aharoni, Avinoam Shuper
BACKGROUND AND PURPOSE: A thick corpus callosum (TCC) can be associated with a very grave outcome in fetuses, but its clinical presentation in older children seems to be markedly different. METHODS: The corpus callosum (CC) was defined as thick based on observations and impressions. We reviewed cases of children who were diagnosed as TCC based on brain magnetic resonance imaging (MRI) studies. The pertinent clinical data of these children were collected, and their CCs were measured...
April 2017: Journal of Clinical Neurology
https://www.readbyqxmd.com/read/28406231/environmentally-friendly-synthesis-of-ceo2-nanoparticles-for-the-catalytic-oxidation-of-benzyl-alcohol-to-benzaldehyde-and-selective-detection-of-nitrite
#7
P Tamizhdurai, Subramanian Sakthinathan, Shen-Ming Chen, K Shanthi, S Sivasanker, P Sangeetha
Cerium oxide nanoparticles (CeO2 NPs) are favorable in nanotechnology based on some remarkable properties. In this study, the crystalline CeO2 NPs are successfully prepared by an efficient microwave combustion (MCM) and conventional route sol-gel (CRSGM) methods. The structural morphology of the as-prepared CeO2 NPs was investigated by various spectroscopic and analytical techniques. Moreover, the XRD pattern confirmed the formation of CeO2 NPs as a face centered cubic structure. The magnetometer studies indicated the low saturation magnetization (23...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28403609/solid-state-nmr-characterization-of-ibuprofen-nicotinamide-cocrystals-and-new-idea-for-controlling-release-of-drugs-embedded-into-mesoporous-silica-particles
#8
Ewa Skorupska, Sławomir Kaźmierski, Marek J Potrzebowski
Grinding and melting methods were employed for synthesis of pharmaceutical cocrystals formed by racemic (R/S) and entiomeric (S) ibuprofen (IBU) and nicotinamide (NA) as coformer. Obtained (R/S)-IBU:NA and (S)-IBU:NA cocrystals were fully characterized by means of advanced one- and two-dimensional solid state nuclear magnetic resonance (SS NMR) techniques with very fast magic angle spinning (MAS) at 60 kHz. The distinction in molecular packing and specific hydrogen bonding pattern was clearly recognized by analysis of (1)H, (13)C, and (15)N spectra...
April 18, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28402439/chromodomain-protein-cdyl-is-required-for-transmission-restoration-of-repressive-histone-marks
#9
Yongqing Liu, Shumeng Liu, Shuai Yuan, Huajing Yu, Yu Zhang, Xiaohan Yang, Guojia Xie, Zhe Chen, Wanjin Li, Bosen Xu, Luyang Sun, Yongfeng Shang, Jing Liang
Faithful transmission or restoration of epigenetic information such as repressive histone modifications through generations is critical for the maintenance of cell identity. We report here that chromodomain Y-like protein (CDYL), a chromodomain-containing transcription corepressor, is physically associated with chromatin assembly factor 1 (CAF-1) and the replicative helicase MCM complex. We showed that CDYL bridges CAF-1 and MCM, facilitating histone transfer and deposition during DNA replication. We demonstrated that CDYL recruits histone-modifying enzymes G9a, SETDB1, and EZH2 to replication forks, leading to the addition of H3K9me2/3 and H3K27me2/3 on newly deposited histone H3...
April 10, 2017: Journal of Molecular Cell Biology
https://www.readbyqxmd.com/read/28394568/hypervalent-bismuthides-la3mbi5-m-ti-zr-hf-and-related-antimonides-absence-of-superconductivity
#10
Taito Murakami, Takafumi Yamamoto, Fumitaka Takeiri, Kousuke Nakano, Hiroshi Kageyama
We successfully synthesized the ternary bismuthides La3MBi5 (M = Ti, Zr, Hf). These compounds crystallize in the hexagonal Hf5Sn3Cu-anti type structure (space group: P63/mcm) consisting of face-sharing MBi6 octahedral chains and hypervalent Bi linear chains, both separated by La atoms. Magnetic susceptibility and electrical resistivity measurements revealed that all of the compounds, including the solid solution La3Ti(Bi1-xSbx)5, exhibit a Pauli paramagnetic behavior without any trace of superconductivity down to 1...
April 10, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28390134/primordial-odontogenic-tumor-an-immunohistochemical-profile
#11
R Bologna-Molina, T Mikami, V Pereira-Prado, F-R Pires, R Carlos-Bregni, A Mosqueda-Taylor
BACKGROUND: Primordial Odontogenic Tumor (POT) is a recently described odontogenic tumor characterized by a variably cellular loose fibrous tissue with areas similar to the dental papilla, covered by cuboidal to columnar epithelium that resembles the internal epithelium of the enamel organ, surrounded at least partly by a delicate fibrous capsule. The purpose of this study was to investigate the possible histogenesis and biological behavior of this rare tumor by means of a wide immunohistochemical analysis of its epithelial and mesenchymal components...
April 8, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/28387391/a-neutron-spin-echo-study-of-low-temperature-water-confined-in-the-spherical-silica-pores-of-sba-16
#12
Shigeharu Kittaka, Koji Yoshida, Toshio Yamaguchi, M-C Bellissent Funel, Peter Fouquet
The dynamic properties of heavy water (D2O) and light water (H2O) confined in porous silica SBA-16 were studied over a temperature range of 210-290 K by neutron spin echo measurements. SBA-16 has predominant spherical pores (7.1 nm in pore size), channels interconnecting the spherical pores, and micropores (corona). The coherent intermediate scattering function on D2O filled SBA-16 showed the rotational dynamics of confined water without significant translational motion over the temperature range measured. This finding is due probably to collective entities of water due to cooperativity of hydrogen-bonds among water molecules in SBA-16 pores...
April 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28383499/eukaryotic-replicative-helicase-subunit-interaction-with-dna-and-its-role-in-dna-replication
#13
REVIEW
Matthew P Martinez, Amanda L Wacker, Irina Bruck, Daniel L Kaplan
The replicative helicase unwinds parental double-stranded DNA at a replication fork to provide single-stranded DNA templates for the replicative polymerases. In eukaryotes, the replicative helicase is composed of the Cdc45 protein, the heterohexameric ring-shaped Mcm2-7 complex, and the tetrameric GINS complex (CMG). The CMG proteins bind directly to DNA, as demonstrated by experiments with purified proteins. The mechanism and function of these DNA-protein interactions are presently being investigated, and a number of important discoveries relating to how the helicase proteins interact with DNA have been reported recently...
April 6, 2017: Genes
https://www.readbyqxmd.com/read/28373564/cmg-pol-epsilon-dynamics-suggests-a-mechanism-for-the-establishment-of-leading-strand-synthesis-in-the-eukaryotic-replisome
#14
Jin Chuan Zhou, Agnieszka Janska, Panchali Goswami, Ludovic Renault, Ferdos Abid Ali, Abhay Kotecha, John F X Diffley, Alessandro Costa
The replisome unwinds and synthesizes DNA for genome duplication. In eukaryotes, the Cdc45-MCM-GINS (CMG) helicase and the leading-strand polymerase, Pol epsilon, form a stable assembly. The mechanism for coupling DNA unwinding with synthesis is starting to be elucidated, however the architecture and dynamics of the replication fork remain only partially understood, preventing a molecular understanding of chromosome replication. To address this issue, we conducted a systematic single-particle EM study on multiple permutations of the reconstituted CMG-Pol epsilon assembly...
April 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28368583/thio-modification-of-trna-at-the-wobble-position-as-regulator-of-the-kinetics-of-decoding-and-translocation-on-the-ribosome
#15
Namit Ranjan, Marina V Rodnina
Uridine 34 (U34) at the wobble position of the tRNA anticodon is post-transcriptionally modified, usually to mcm(5)s(2), mcm(5), or mnm(5). The lack of the mcm(5) or s(2) modification at U34 of tRNA(Lys), tRNA(Glu), and tRNA(Gln) causes ribosome pausing at the respective codons in yeast. The pauses occur during the elongation step, but the mechanism that triggers ribosome pausing is not known. Here, we show how the s(2) modification in yeast tRNA(Lys) affects mRNA decoding and tRNA-mRNA translocation. Using real-time kinetic analysis we show that mcm(5)-modified tRNA(Lys) lacking the s(2) group has a lower affinity of binding to the cognate codon and is more efficiently rejected than the fully modified tRNA(Lys)...
April 13, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28368371/cul-2-lrr-1-and-ubxn-3-drive-replisome-disassembly-during-dna-replication-termination-and%C3%A2-mitosis
#16
Remi Sonneville, Sara Priego Moreno, Axel Knebel, Clare Johnson, C James Hastie, Anton Gartner, Agnieszka Gambus, Karim Labib
Replisome disassembly is the final step of DNA replication in eukaryotes, involving the ubiquitylation and CDC48-dependent dissolution of the CMG helicase (CDC45-MCM-GINS). Using Caenorhabditis elegans early embryos and Xenopus laevis egg extracts, we show that the E3 ligase CUL-2(LRR-1) associates with the replisome and drives ubiquitylation and disassembly of CMG, together with the CDC-48 cofactors UFD-1 and NPL-4. Removal of CMG from chromatin in frog egg extracts requires CUL2 neddylation, and our data identify chromatin recruitment of CUL2(LRR1) as a key regulated step during DNA replication termination...
April 3, 2017: Nature Cell Biology
https://www.readbyqxmd.com/read/28360421/muscle-specific-downregulation-of-gr-levels-inhibits-adipogenesis-in-porcine-intramuscular-adipocyte-tissue
#17
Weiwei Chu, Wei Wei, Haiyin Han, Ying Gao, Kaiqing Liu, Ye Tian, Zaohang Jiang, Lifan Zhang, Jie Chen
Intramuscular adipose is conducive to good pork quality, whereas subcutaneous adipose is considered as waste in pig production. So uncovering the regulation differences between these two adiposes is helpful to tissue-specific control of fat deposition. In this study, we found the sensitivity to glucocorticoids (GCs) was lower in intramuscular adipocytes (IMA) compared with subcutaneous adipocytes (SA). Comparison of glucocorticoid receptor (GR) revealed that IMA had lower GR level which contributed to its reduced GCs sensitivity...
March 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28357386/a-new-role-for-holliday-junction-resolvase-yen1-in-processing-dna-replication-intermediates-exposes-dna2-as-an-accessory-replicative-helicase
#18
COMMENT
Benoît Falquet, Ulrich Rass
DNA replication is mediated by a multi-protein complex known as the replisome. With the hexameric MCM (minichromosome maintenance) replicative helicase at its core, the replisome splits the parental DNA strands, forming replication forks (RFs), where it catalyses coupled leading and lagging strand DNA synthesis. While replication is a highly effective process, intrinsic and oncogene-induced replication stress impedes the progression of replisomes along chromosomes. As a consequence, RFs stall, arrest, and collapse, jeopardizing genome stability...
January 2, 2017: Microbial Cell
https://www.readbyqxmd.com/read/28357324/sulfur-transfer-and-activation-by-ubiquitin-like-modifier-system-uba4%C3%A2-urm1-link-protein-urmylation-and-trna-thiolation-in-yeast
#19
André Jüdes, Alexander Bruch, Roland Klassen, Mark Helm, Raffael Schaffrath
Urm1 is a unique dual-function member of the ubiquitin protein family and conserved from yeast to man. It acts both as a protein modifier in ubiquitin-like urmylation and as a sulfur donor for tRNA thiolation, which in concert with the Elongator pathway forms 5-methoxy-carbonyl-methyl-2-thio (mcm(5)s(2)) modified wobble uridines (U34) in anticodons. Using Saccharomyces cerevisiae as a model to study a relationship between these two functions, we examined whether cultivation temperature and sulfur supply previously implicated in the tRNA thiolation branch of the URM1 pathway also contribute to proper urmylation...
October 24, 2016: Microbial Cell
https://www.readbyqxmd.com/read/28355556/ufd1-npl4-recruit-cdc48-for-disassembly-of-ubiquitylated-cmg-helicase-at-the-end-of-chromosome-replication
#20
Marija Maric, Progya Mukherjee, Michael H Tatham, Ronald Hay, Karim Labib
Disassembly of the Cdc45-MCM-GINS (CMG) DNA helicase is the key regulated step during DNA replication termination in eukaryotes, involving ubiquitylation of the Mcm7 helicase subunit, leading to a disassembly process that requires the Cdc48 "segregase". Here, we employ a screen to identify partners of budding yeast Cdc48 that are important for disassembly of ubiquitylated CMG helicase at the end of chromosome replication. We demonstrate that the ubiquitin-binding Ufd1-Npl4 complex recruits Cdc48 to ubiquitylated CMG...
March 28, 2017: Cell Reports
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