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Items from 1 to 20 out of 248 results

article

Synthesis of Polymer Inclusion Membranes based on Cellulose Triacetate for Recovery of Lanthanum(III) from Aqueous Solutions

Adam Makowka, Beata Pospiech

Autex Research Journal > 2019 > Vol. 19, no. 3 > 288--292

Polymer inclusion membrane (PIM) containing cellulose triacetate (CTA) as a polymer matrix and 2-nitrophenyl octyl ether (NPOE) as a plasticizer was developed. This membrane also contained di(2-ethylhexyl)phosphoric acid (D2EHPA) and tributyl phosphate (TBP) as the carriers of metal ions. The facilitated transport of lanthanum(III) from aqueous nitrate(V) solutions across PIM was studied. It was observed...

article

Miniaturized application of 3D‐printed large‐flow microreactor in extraction and separation of platinum, palladium and rhodium

Xiaoling Liu, Xiteng Li, Shaohua Ju, Yongwan Gu, more

Journal of Chemical Technology & Biotechnology > 96 > 4 > 1007 - 1015

Problems of long extraction time, large footprint, low single‐stage extraction efficiency, and complicated production processes in solvent extraction equipment in recycling of modern industrial precious metal waste liquids are addressed and application of miniaturized equipment to hydrometallurgy is proposed in this study. A 3D‐printed multichannel microfluidic reactor will likely replace traditional...

article

An in vitro characterisation of the Trichomonas vaginalis TATA box-binding proteins (TBPs)

Olivia Parra-Marín, Lluvia Rosas-Hernández, Karla López-Pacheco, Bernardo Franco, more

Parasitology Research > 2019 > 118 > 10 > 3019-3031

The protozoan parasite Trichomonas vaginalis is a common human pathogen from one of the earliest-diverging eukaryotic lineages. At the transcriptional level, the highly conserved Inr element of RNA pol II-transcribed genes surrounds the transcription start site and is recognised by IBP39, a protein exclusive of T. vaginalis. Typical TATA boxes have not been identified in this organism but, in contrast,...

article

The Behavior of Rare Earth Elements of the Heavy-Medium Group in the Content of the Extract Cyanex®572–TBP in Scrubbing with Nitric Acid

S. S. Shulin, G. N. Galieva, S. V. Chizhevskaya, A. A. Semenov

Inorganic Materials > 2019 > 55 > 2 > 200-204

The behavior of individual rare earth elements of the heavy-medium group (HMREE) in the composition of extremely loaded mixture of extractants of Cyanex^®572–TBP in the conditions of scrubbing with solutions of nitric acid without rare earths in extraction separation of the concentrate of MREE is discussed. The effect of the concentration of nitric acid in scrubbing solutions on the degree of stripping...

article

Solvent Extraction of Copper Using TBP, D2EHPA and MIBK

Mehdi Irannajad, Zahra Afzali, Hossein Kamran Haghighi

Russian Journal of Non-Ferrous Metals > 2018 > 59 > 6 > 605-611

In this research, a synergetic system of solvent extraction process was developed to recover copper from aqueous solutions with tri-n-butyl phosphate (TBP), di-2-ethyl hexyl phosphoric acid (D2EHPA) and methyl iso-butyl ketone (MIBK). The effect of significant parameters such as pH, organic phase composition, aqueous to organic phase ratio (A : O), sodium acetate (CH₃COONa) concentration and presence...

article

Isolation of Au and Pt radionuclides from deuteron-irradiated platinum using TBP resin

Samuel S. Morrison, Erin C. Morrison, Nicolas E. Uhnak, Richard S. Wittman, more

Journal of Radioanalytical and Nuclear Chemistry > 2019 > 319 > 3 > 679-686

A separation procedure was developed and implemented for the isolation of gold (Au) and platinum (Pt) radionuclides from deuteron irradiated Pt using tri-butyl phosphate (TBP) resin. Computational modeling and experimental results of the Au and Pt radionuclide production were reported and compared to literature values. Results of the separation procedure demonstrated a Pt recovery of 98 ± 2% and a...

article

Densities, viscosities, and refractive indices for the binary mixtures of tri-n-butyl phosphate (TBP) with toluene and ethylbenzene between (303.15 and 323.15) K

M. Masum Billah, M. Mehedi Hasan Rocky, Iqbal Hossen, Irin Hossain, more

Journal of Molecular Liquids > 2018 > 265 > C > 611-620

Densities, ρ, viscosities, η, and refractive indices, n_D, were measured for the binary mixtures of tri-n-butyl phosphate (TBP) with toluene and ethylbenzene over the entire range of composition, and at different temperatures from T = (303.15 to 323.15) K. From experimental data of ρ, η, and n_D, the excess molar volumes, V_m^E, partial molar volumes, V¯i, thermal expansivities, α, excess thermal expansivities,...

article

Sequence-Directed Action of RSC Remodeler and General Regulatory Factors Modulates +1 Nucleosome Position to Facilitate Transcription

Slawomir Kubik, Eoghan O’Duibhir, Wim J. de Jonge, Stefano Mattarocci, more

Molecular Cell > 2018 > 71 > 1 > 89-102.e5

Accessible chromatin is important for RNA polymerase II recruitment and transcription initiation at eukaryotic promoters. We investigated the mechanistic links between promoter DNA sequence, nucleosome positioning, and transcription. Our results indicate that positioning of the transcription start site-associated +1 nucleosome in yeast is critical for efficient TBP binding and is driven by two key...

article

The experimental investigations on viscosity, surface tension, interfacial tension and solubility of the binary and ternary systems for tributyl phosphate (TBP) extractant in various organic solvents with water: Thermodynamic NRTL model and molecular interaction approach

Thidarat Wongsawa, Tanakon Koonsang, Naphaphan Kunthakudee, Tatchanok Prapasawat, more

Journal of Molecular Liquids > 2018 > 251 > C > 229-237

In order to provide a database for supporting stability in the separation processes, the physical properties of the mixing solutions between extractant and organic solvents, with/without water, were investigated at temperature 303.2K and pressure 0.1MPa. The extractant of tributyl phosphate (TBP) as well as the following organic solvents i.e. cyclohexane, n-heptane, kerosene and toluene were selected...

article

Selective recovery of rhenium from molybdenite flue-dust leach liquor using solvent extraction with TBP

Humma Akram Cheema, Sadia Ilyas, Shafaq Masud, Muhammad Ahmad Muhsan, more

Separation and Purification Technology > 2018 > 191 > C > 116-121

The selective extraction of rhenium from the leach liquor of molybdenite roasting flue-dust and its subsequent stripping were investigated using the solvent extraction technique. In this study, tri-butyl phosphate (TBP) as organic extractant in kerosene and metals bearing solution (in mg/L: 6042 Mo, 208 Re, 534 Cu, 1982 Fe, 32Mg, and 19 Pb) were used as the organic and aqueous feed, respectively....

article

Leading role of TBP in the Establishment of Complexity in Eukaryotic Transcription Initiation Systems

Eiryo Kawakami, Naruhiko Adachi, Toshiya Senda, Masami Horikoshi

Cell Reports > 2017 > 21 > 13 > 3941-3956

While both archaeal and eukaryotic transcription initiation systems utilize TBP (TATA box-binding protein) and TFIIB (transcription factor IIB), eukaryotic systems include larger numbers of initiation factors. It remains uncertain how eukaryotic transcription initiation systems have evolved. Here, we investigate the evolutionary development of TBP and TFIIB, each of which has an intramolecular direct...

article

Body Temperature Cycles Control Rhythmic Alternative Splicing in Mammals

Marco Preußner, Gesine Goldammer, Alexander Neumann, Tom Haltenhof, more

Molecular Cell > 2017 > 67 > 3 > 433-446.e4

The core body temperature of all mammals oscillates with the time of the day. However, direct molecular consequences of small, physiological changes in body temperature remain largely elusive. Here we show that body temperature cycles drive rhythmic SR protein phosphorylation to control an alternative splicing (AS) program. A temperature change of 1°C is sufficient to induce a concerted splicing switch...

article

Genome-wide Single-Molecule Footprinting Reveals High RNA Polymerase II Turnover at Paused Promoters

Arnaud R. Krebs, Dilek Imanci, Leslie Hoerner, Dimos Gaidatzis, more

Molecular Cell > 2017 > 67 > 3 > 411-422.e4

Transcription initiation entails chromatin opening followed by pre-initiation complex formation and RNA polymerase II recruitment. Subsequent polymerase elongation requires additional signals, resulting in increased residence time downstream of the start site, a phenomenon referred to as pausing. Here, we harnessed single-molecule footprinting to quantify distinct steps of initiation in vivo throughout...

article

Studies on liquid–liquid extraction of La(III) from acidic nitrate medium using TBP in petrofin

Swagatika Satpathy, Sanghamitra Pradhan, Sujata Mishra

Journal of Radioanalytical and Nuclear Chemistry > 2017 > 313 > 3 > 531-536

The present study aims at investigating the capability of tri-n-butyl phosphate (TBP) in petrofin as extracting agent for La(III) from acidic nitrate medium. The concentrations of TBP and sodium nitrate have positive influence while temperature shows a negative impact on the extraction. The values of standard enthalpy change and entropy change confirm the extraction process as exothermic with a decrease...

article

Recovery of volatile fatty acids by reactive extraction using tri‐n‐octylamine and tri‐butyl phosphate in different solvents: Equilibrium studies, pH and temperature effect, and optimization using multivariate taguchi approach

Sumalatha Eda, Alka Kumari, Prathap Kumar Thella, Bankupalli Satyavathi, more

The Canadian Journal of Chemical Engineering > 95 > 7 > 1373 - 1387

Recovery of volatile fatty acids from fermentation broth has been investigated by adopting an intensified approach using extractants tri‐n‐octylamine and tri‐butyl phosphate dissolved in 1‐decanol and methyl isobutyl ketone. The effects on distribution coefficient (K_D) and extraction efficiency (%E) were studied by varying the operating conditions like temperature (293.15–323.15) K, pH (2.5, 3.5,...

article

Halogen-free organophosphorus flame retardants caused oxidative stress and multixenobiotic resistance in Asian freshwater clams (Corbicula fluminea)

Saihong Yan, Huimin Wu, Jianhui Qin, Jinmiao Zha, more

Environmental Pollution > 2017 > 225 > C > 559-568

Halogen-free organophosphorus flame retardants are widespread in aquatic environments. Although it has been documented that they affect the behavior and reproduction of aquatic species, researches investigating cellular detoxification and the defense system in bivalves are scarce. In this study, adult Asian clams (C. fluminea) were exposed to tris (2-butoxyethyl) phosphate (TBEP) and tributyl phosphate...

article

Solvent extraction process for the recovery of nickel and cobalt from Caldag laterite leach solution: The first bench scale study

Sait Kursunoglu, Zela Tanlega Ichlas, Muammer Kaya

Hydrometallurgy > 2017 > 169 > C > 135-141

A solvent extraction application consisting of two-sequential solvent extraction circuits to separate the nickel and cobalt from a synthetic sulphate leach solution which simulates a typical Caldag lateritic leach solution was conceived and experimentally explored. The first circuit allowed the simultaneous extraction of most of the nickel (98%), cobalt (98%) and manganese (94%) with 20% neodecanoic...

article

Experimental and modelling study of ruthenium extraction with tri-n-butylphosphate in the purex process

P. Moeyaert, M. Miguirditchian, M. Masson, B. Dinh, more

Chemical Engineering Science > 2017 > 158 > C > 580-586

Ruthenium extraction by tri-n-butylphosphate (TBP) from nitric acid was studied and modelled in the conditions of the PUREX process. Experimental distribution ratios obtained for water, nitric acid and ruthenium were described with a physicochemical model based on the application of the mass action law on each extraction equilibrium and by taking into account deviations from thermodynamic ideal behaviour...

article

A naturally occurring variant of HPV-16 E7 exerts increased transforming activity through acquisition of an additional phospho-acceptor site

Amira Zine El Abidine, Vjekoslav Tomaić, Rahima Bel Haj Rhouma, Paola Massimi, more

Virology > 2017 > 500 > C > 218-225

Human Papillomavirus E6 and E7 play critical roles in cancer development, although not all isolates of the viral oncoproteins are identical. A common E7 variant encodes an amino acid change at N29S. We show that this change increases the levels of phosphorylation by CKII by creating an additional phospho-acceptor site at S29. This confers increased phospho-dependent interaction with a number of cellular...

article

Comparison on mineralization of 2,4,6-tribromophenol by UV-based advanced oxidation processes: UV/Na₂S₂O₈ and UV/H₂O₂

Yong Gu, Ying Chen, Xianbo Sun, Yongdi Liu

Research on Chemical Intermediates > 2017 > 43 > 5 > 3095-3110

Mineralization of 2,4,6-tribromophenol (TBP) in water by UV-based oxidation processes (AOPs) including UV/H₂O₂ and UV/Na₂S₂O₈ (UV/PS) was explored in this work. There was firstly systematically and comparatively an investigation of these two AOPs on the mineralization of TBP for toxicity change, mineralization efficiency and economic cost. The effects of oxidant concentration, initial TBP concentration...

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SOLVENT EXTRACTION (33)
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CYANEX 923 (3)
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HDEHP (3)
III-V SEMICONDUCTORS (3)
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MIBK (3)
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RHENIUM (3)
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Synthesis of Polymer Inclusion Membranes based on Cellulose Triacetate for Recovery of Lanthanum(III) from Aqueous Solutions

Miniaturized application of 3D‐printed large‐flow microreactor in extraction and separation of platinum, palladium and rhodium

An in vitro characterisation of the Trichomonas vaginalis TATA box-binding proteins (TBPs)

The Behavior of Rare Earth Elements of the Heavy-Medium Group in the Content of the Extract Cyanex®572–TBP in Scrubbing with Nitric Acid

Solvent Extraction of Copper Using TBP, D2EHPA and MIBK

Isolation of Au and Pt radionuclides from deuteron-irradiated platinum using TBP resin

Densities, viscosities, and refractive indices for the binary mixtures of tri-n-butyl phosphate (TBP) with toluene and ethylbenzene between (303.15 and 323.15) K

Sequence-Directed Action of RSC Remodeler and General Regulatory Factors Modulates +1 Nucleosome Position to Facilitate Transcription

The experimental investigations on viscosity, surface tension, interfacial tension and solubility of the binary and ternary systems for tributyl phosphate (TBP) extractant in various organic solvents with water: Thermodynamic NRTL model and molecular interaction approach

Selective recovery of rhenium from molybdenite flue-dust leach liquor using solvent extraction with TBP

Leading role of TBP in the Establishment of Complexity in Eukaryotic Transcription Initiation Systems

Body Temperature Cycles Control Rhythmic Alternative Splicing in Mammals

Genome-wide Single-Molecule Footprinting Reveals High RNA Polymerase II Turnover at Paused Promoters

Studies on liquid–liquid extraction of La(III) from acidic nitrate medium using TBP in petrofin

Recovery of volatile fatty acids by reactive extraction using tri‐n‐octylamine and tri‐butyl phosphate in different solvents: Equilibrium studies, pH and temperature effect, and optimization using multivariate taguchi approach

Halogen-free organophosphorus flame retardants caused oxidative stress and multixenobiotic resistance in Asian freshwater clams (Corbicula fluminea)

Solvent extraction process for the recovery of nickel and cobalt from Caldag laterite leach solution: The first bench scale study

Experimental and modelling study of ruthenium extraction with tri-n-butylphosphate in the purex process

A naturally occurring variant of HPV-16 E7 exerts increased transforming activity through acquisition of an additional phospho-acceptor site

Comparison on mineralization of 2,4,6-tribromophenol by UV-based advanced oxidation processes: UV/Na₂S₂O₈ and UV/H₂O₂

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