2,686 research outputs found
Synthesis of a composite Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>/poly(SMA-co-BA-co-BZMA-co-DMC) and evaluation of its oil-water separation performance
No full textTo obtain a demulsification material with convenient recovery, high oil-water separation capacity, and excellent reusability, Fe3O4@SiO2 core-shell particles and hydrophilic DMC were introduced into the acrylic ester-based polymer system to prepare a magnetic amphiphilic composite demulsifier, Fe3O4@SiO2/poly(SMA-co-BA-co- BZMA-co-DMC) (Fe3O4@SiO2/PAMCs-P). The molecular structure of Fe3O4@SiO2/PAMCs-P was characterized using FT-IR and XPS, while the morphology was observed using SEM. Additionally, the effects of TEOS, Fe3O4@SiO2 core-shell particles, and DMC dosage on the demulsification performance of the composites were discussed in detail. Fe3O4@SiO2/PAMCs-P exhibited excellent demulsification, oil-water separation, and reusability properties for CTAB-toluene emulsions. Under magnetic field conditions, Fe3O4@SiO2/PAMCs-P achieved saturated separation within 2 h with a separation efficiency of 97.9%. After five consecutive separations, the separation efficiency decreased to 39.1%, but it could be restored to 91.5% of the initial separation efficiency after desorption. These results indicate that Fe3O4@SiO2/PAMCs-P has valuable application potential in emulsified wastewater treatment
mixture treatment
No full textTo acquire a material with simultaneous oil–water emulsion demulsification and oil-absorbing performance, SiO
2 nanoparticles were introduced into the acrylate polymerization system to prepare oil absorbent SiO
2/P (SMA-co-MMA-co-BA) (PSA-SiO
2). PSA-SiO
2 was synthesized from monomers and functional materials, including methyl methacrylate (MMA), butyl acrylate (BA), octadecyl methacrylate (SMA) and SiO
2 hydrophobically modified by vinyltrimethoxysilane. The molecular structure of PSA-SiO
2 was characterized by FT-IR, and its morphology was observed using scanning electron microscopy. In addition, the optimal synthesis conditions for the polymerization system, such as the monomer ratio, the amount of crosslinker and stabilizer and then the particle size and dose of SiO
2, were discussed in detail. PSA-SiO
2 had a decent oil absorbency for pure halogenated and aromatic hydrocarbons (49.10, 56.41, 47.32, 43.45, 36.22, and 30.14 g/g for CH
2Cl
2, CHCl
3, CCl
4, C
2Cl
4, toluene and styrene, respectively). Furthermore, SiO
2, as a functional material, makes composites that possess excellent demulsification properties for oil-in-water emulsions. The oil removal efficiency of CHCl
3 in Tween 80-stabilized and CTAB-stabilized emulsions were 94.88% and 98.11%, respectively. All results indicated that PSA-SiO
2 had valuable potential for oil removal and emulsion treatment. Highlights: An organic–inorganic composite was synthesized by suspension polymerization. The composite was applied for absorbing pure oil or removing oil form water. By modification, the composite acquired the demulsification ability. The composite accomplished one-step demulsification and emulsion treatment. The oil absorption and emulsion treatment could achieve at room temperature.</p
A novel molecular class that recruits HDAC/MECP2 complexes to PU.1 motifs reduces neuroinflammation
No full textPervasive neuroinflammation occurs in many neurodegenerative diseases, including Alzheimer’s disease (AD). SPI1/PU.1 is a transcription factor located at a genome-wide significant AD-risk locus and its reduced expression is associated with delayed onset of AD. We analyzed single-cell transcriptomic datasets from microglia of human AD patients and found an enrichment of PU.1-binding motifs in the differentially expressed genes. In hippocampal tissues from transgenic mice with neurodegeneration, we found vastly increased genomic PU.1 binding. We then screened for PU.1 inhibitors using a PU.1 reporter cell line and discovered A11, a molecule with anti-inflammatory efficacy and nanomolar potency. A11 regulated genes putatively by recruiting a repressive complex containing MECP2, HDAC1, SIN3A, and DNMT3A to PU.1 motifs, thus representing a novel mechanism and class of molecules. In mouse models of AD, A11 ameliorated neuroinflammation, loss of neuronal integrity, AD pathology, and improved cognitive performance. This study uncovers a novel class of anti-inflammatory molecules with therapeutic potential for neurodegenerative disorders
Automating the determination of wave speed using the pu-loop method
No full textThe PU-loop (pressure-velocity loop) is a method for determining wave speed and relies on the linear relationship between the pressure and velocity in the absence of reflected waves. This linearity of the PU-loop during early systole, which is directly related to wave speed, has always been established by eye. This paper presents a new technique that establishes this linearity and thus determining wave speed online. Pressure and flow were measured in the ascending aorta of 11 anesthetised dogs. The slope of the PU-loop, indicating wave speed was determined by eye and by using the new technique. The difference between the slopes of the two methods is in the order of 3%. The new technique is convenient and allows for the online assessment of wave speed, which could be used as a bedside tool for the assessment of arterial compliance
A pu -k lativusrag fejleményei a déli szamojédban
No full textIn the light of newly published material, the author investigates various Selkup and Kamassian suffixes containing the developments of PU -K and gives her reasons why she does interpret them as continuations of the PU lative suffix
KELVIN-HELMHOLTZ INSTABILITY IN COLLISIONLESS SPACE PLASMAS
No full textPhysics, Fluids & PlasmasSCI(E)9ARTICLE2440-447
Literacy and the vernacular : a case study based on the post-colonial history of Mauritius, with particular reference to Mauritian Creole
No full textThis thesis examines the process of the literization of the vernacular, and seeks to establish the island of Mauritius as a case study of this process. The concept of literization equates standardization of the vernacular with its use as a written language. Four issues are established as central to this process: ideological, educational, sociocultural and technical.
The thesis investigates the particular sociolinguistic situation of Mauritius, and examines each of these issues in relation to Mauritian Creole. It demonstrates the role that Mauritian Creole plays in Mauritian society, and how, since independence, issues relating to ideology, education, and the cultural and technical aspects of standardization, have been involved in the promotion of the language. The interaction between these issues is apparent throughout the thesis, and manifested in the work of Ledikasyon pu Travayer (LPT), the only organization in Mauritius to provide literacy tuition in Mauritian Creole. The thesis seeks to show that their unified approach to literacy, standardization, and the promotion of Mauritian Creole exemplifies the issues involved, and provides the best basis for the establishment of Mauritian Creole as a standard language.
The analysis of the situation in Mauritius within the framework of wider issues of the literization of the vernacular permits a comparison to other former colonies facing problems of language choice, and places these issues within the wider sociolinguistic context of standardization
Molecular size distribution of Pu in the presence of humic substances in river and groundwaters
No full textThe association properties of Pu with aquatic humic substances in a 0.01M NaClO4 solution at pH 6–8 were studied on the basis of molecular size distribution. Seven humic substances were isolated from river water and groundwaters using XAD extraction technique. They were used for comparing their effects on the association of Pu. In the presence of humic acid, the dominant molecular size of Pu was 100–30 kDa. In the presence of fulvic acid, Pu exhibited three dominant molecular sizes: 30–10 kDa, 30–5 kDa, and less than 5 kDa. The association of Pu-humus complexes might be controlled by the molecular size distribution of humic substances and characteristics of their respective size fractions
Electron Elastic Collisions with Pu, Am and Lr Actinide Atoms
No full textSynopsis The robust Regge-pole methodology which embeds the crucial electron correlations and the vital core-polarization interaction is used to explore negative-ion formation in the actinide atoms Pu, Am and Lr through the electron elastic total cross sections (TCSs) calculation. The TCSs are found to be characterized by ground, metastable and excited anionic formation, whence we extract the anionic binding energies and compare them with existing electron affinities. The TCSs exhibit both atomic and molecular behavior in addition to polar- ization-induced metastable TCSs
Author Correction: Massively parallel in vivo CRISPR screening identifies RNF20/40 as epigenetic regulators of cardiomyocyte maturation
No full textCorrection to: Nature Communications 10.1038/s41467-021-24743-z, published online 21 July 2021.
The original version of this Article contained an error in the spelling of the author William T. Pu, which was incorrectly given as William William Pu. This has now been corrected in both the PDF and HTML versions of the Article
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