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Hua Wang, Lingyun Zhou, Chengcheng Zhou, Weiwei Zhao, Jianwu Wang, Libing Liu, Shu Wang, Yilin Wang
Conjugated polymers have great potential applications in bioimaging. However, the aggregation of conjugated polymers driven by electrostatic and hydrophobic interactions in aqueous media results in the reduction of photoluminescence quantum efficiency. In present work we synthesized a carboxylate gemini surfactant (SDHC) to adjust the aggregation behaviors and fluorescence properties of conjugated polymers (anionic MPS-PPV and cationic PMNT). This gemini surfactant shows very low critical micellar concentration (CMC) in aqueous solution and forms vesicles above CMC...
June 19, 2017: ACS Applied Materials & Interfaces
Weiwei Zhao, Yaxun Fan, Hua Wang, Yilin Wang
Coacervation in aqueous solution of the mixture of cationic ammonium surfactant hexamethylene-1,6-bis(dodecyldimethylammonium bromide) (12-6-12) and 10% hydrolyzed polyacrylamide (PAM) has been investigated. It was found that the 12-6-12/PAM mixture forms coacervate with a large network structure over a wide concentration range of surfactant and polyelectrolyte, and shows great efficiency in the extraction of methyl orange (MO) from water owing to the cooperation of hydrophobic, electrostatic and π-cation interactions...
June 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Les G Firbank, Chiara Bertora, David Blankman, Gemini Delle Vedove, Mark Frenzel, Carlo Grignani, Elli Groner, Miklós Kertész, Eveline J Krab, Giorgio Matteucci, Christina Menta, Carsten W Mueller, Jutta Stadler, William E Kunin
The study of ecosystem processes over multiple scales of space and time is often best achieved using comparable data from multiple sites. Yet, long-term ecological observatories have often developed their own data collection protocols. Here, we address this problem by proposing a set of ecological protocols suitable for widespread adoption by the ecological community. Scientists from the European ecological research community prioritized terrestrial ecosystem parameters that could benefit from a more consistent approach to data collection within the resources available at most long-term ecological observatories...
June 2017: Ecology and Evolution
Wangming Tan, Feng Chang, Yan Shu, Ye Chen, Jingjing Liu, Yingzhuang Chen, Ming Ma, Bo Chen
In this work, a novel Gemini-type sulfobetaine-based hybrid monolith was fabricated by co-polymerization of a homemade Gemini-type sufobetaine, 1,3-bis (N-(3-sulfopropyl)-N-(methacrylic acid-2-hydroxy propyl ester)-N-methyl ammonium)-propane (BSMMP) with vinyltrimethoxysilane (VTMS) and tetramethoxysilane (TMOS) in the presence of 2'-azobis (2-methylpropionamidine) dihydrochloride (V50) as initiator. The recipe of pre-copolymerization solution for monolith preparation was optimized carefully, and the resulting monolith was characterized by scan electron microscope (SEM), fourier transform infrared spectroscopy (FT-IR) and thermal gravimetry analysis (TGA)...
October 1, 2017: Talanta
Xuepeng Wu, Caili Dai, Sisi Fang, Hao Li, Yining Wu, Xin Sun, Mingwei Zhao
The adsorption and viscoelastic properties of a micellar solution of 2-hydroxyl-propanediyl-1,3-bis(hexadecyldimethylammonium bromide), abbreviated as 16-3OH-16, have been investigated by surface tension and rheological measurements. Meanwhile, an aqueous solution of propanediyl-1,3-bis(hexadecyldimethylammonium bromide), abbreviated as 16-3-16, was also examined. From the steady state and oscillatory rheological results, a notable difference in shear viscosities between the two systems was observed. Zeta potentials and size distributions confirm the change in the potentials and hydrodynamic diameters, and these results are in good agreement with the rheological results...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
Ken Morishima, Seiya Sugawara, Tomokazu Yoshimura, Mitsuhiro Shibayama
The structure and rheological properties of wormlike micelles formed by a fluorocarbon-hydrocarbon-type hybrid gemini surfactant in an aqueous solution were investigated by means of small-angle X-ray scattering (SAXS) and viscoelastic measurements. The cross-sectional structure (the radius of the hydrophobic core and the thickness of the hydrophilic shell) and the aggregation number per unit axial length of wormlike micelles were evaluated by a model fitting analysis of SAXS profiles. Both parameters for the hybrid gemini surfactant were smaller than those of a corresponding hydrocarbon-hydrocarbon-type gemini surfactant...
June 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Guangyi Liu, Xianglin Yang, Hong Zhong
The nature of froth flotation is to selectively hydrophobize valuable minerals by collector adsorption so that the hydrophobized mineral particles can attach air bubbles. In recent years, the increasing commercial production of refractory complex ores has been urgent to develop special collectors for enhancing flotation separation efficiency of valuable minerals from these ores. Molecular design methods offer an effective way for understanding the structure-property relationship of flotation collectors and developing new ones...
May 10, 2017: Advances in Colloid and Interface Science
B M Gandhi, A L Rao, J V Rao
INTRODUCTION: A sensitive and rapid method for quantitation of Sofosbuvir in human plasma has been established using ultra performance liquid chromatography-electrospray ionization tandem mass spectrometry (UPLC-ESI-MS/MS). MATERIALS AND METHODS: Sofosbuvir d3 was used as an internal standard. Sofosbuvir and internal standard in plasma sample were extracted using ethyl acetate (liquid liquid extraction). A centrifuged upper layer was then evaporated and reconstituted with the mobile phase of 0...
May 8, 2017: Annales Pharmaceutiques Françaises
Amol A Verma, Hassan Masoom, Shail Rawal, Yishan Guo, Fahad Razak
No abstract text is available yet for this article.
May 8, 2017: JAMA Internal Medicine
Ana M Ares, Silvia Valverde, José L Bernal, Laura Toribio, María J Nozal, José Bernal
In this study, a new method has been developed to determine flubendiamide in honey using liquid chromatography coupled to a selective mass spectrometry detector (quadrupole-time-of-flight). An efficient sample treatment involving a solid phase extraction with a C18 sorbent was proposed (average analyte recoveries were between 94 and 104%). Chromatographic analysis (9min) was performed on a C18 column (Gemini C18, 50×2.0mm, 3µm, 110Å). The mobile phase consisted of water and acetonitrile, with a flow rate of 0...
October 1, 2017: Food Chemistry
Samy M Shaban, Ali A Abd-Elaal
Three novels amide Gemini cationic surfactants with various alkyl chains and their silver nanohybrid with silver nanoparticles were synthesized and a confirmation study for surfactant and their nanoparticles formation has been established using IR, (1)HNMR, TEM and UV-Vis spectroscopy. The surface-active properties of these surfactants and their nanoform were investigated through surface tension and electrical conductivity measurements and a comparative study has been established. The thermodynamic parameters of micellization and adsorption were assessed at temperatures range from 25 to 65°C...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
María E Alea-Reyes, Asensio González, Ana C Calpena, David Ramos-López, Joaquín de Lapuente, Lluïsa Pérez-García
HYPOTHESIS: Gemini pyridinium-based amphiphiles can play a triple role as: gold nanoparticles (AuNPs) synthesis facilitator, particle stabilizer and anion recognition centre. The so formed nanoparticles should be able to bind and release anionic drugs. EXPERIMENTS: We describe (a) Synthesis, by a phase transfer method, of both new organic media and water soluble AuNPs using gemini-type surfactants based on bis-pyridinium salts as ligands, acting as transfer agents into organic media and also as nanoparticle stabilizers, (b) Examination of their stability in solution, (c) Chemical and physical characterization of the nanoparticles, (d) Toxicity data concerning both the bis-pyridinium ligands and the bis-pyridinium coated nanoparticles, and (e) Study of their ability for delivering anionic pharmaceuticals such as ibuprofen and piroxicam...
April 21, 2017: Journal of Colloid and Interface Science
G Alsagheer, M S Abdel-Kader, A M Hasan, O Mahmoud, O Mohamed, A Fathi, M Abass, A Abolyosr
INTRODUCTION AND OBJECTIVES: Although extracorporeal shock wave lithotripsy (ESWL) is the first choice for pediatric renal calculi <2 cm, the success rate after the first session is low. This is in contrast to other minimally invasive procedures like percutanous nephrolithotomy (PCNL) and retrograde intrarenal surgery (RIRS), which have higher rates of success. Therefore, the present study sought to identify predictors of success after one session of ESWL. PATIENTS AND METHODS: A prospective study including 100 children with renal stone burden <2 cm who underwent ESWL at the present institution...
April 18, 2017: Journal of Pediatric Urology
Shan Zhao, Guohe Huang, Sen Mu, Chunjiang An, Xiujuan Chen
The immobilization of phenanthrene from aqueous phase onto natural and gemini surfactant modified sepiolite was investigated with respect to contact time, pH, ionic strength and temperature. The surface modification was examined through FT-IR characterization, SEM technique, and the thermogravimetric analysis. The maximum sorption capacity of phenanthrene on modified sepiolite was 95.15μgg(-1) with initial PHE concentration 1.0mgL(-1), temperature 293K, pH7, and ionic strength 1M. The corresponding PHE removal efficiency was higher than 95%...
November 15, 2017: Science of the Total Environment
Jesse G McDaniel, Arun Yethiraj
Bilayers composed of lipid or surfactant molecules are central to biological membranes and lamellar lyotropic liquid crystalline (LLC) phases. Common to these systems are phases that exhibit either ordered or disordered packing of the hydrophobic tails. In this work, we study the impact of surfactant ordering, i.e., disordered Lα and ordered Lβ LLC phases, on the dynamics of water and sodium ions in the lamellar phases of dicarboxylate gemini surfactants. We study the different phases at identical hydration levels by changing the length of the hydrophobic tails; surfactants with shorter tails form Lα phases and those with longer tails form Lβ phases...
May 4, 2017: Journal of Physical Chemistry. B
Moritz Herle, Alison Fildes, Frühling Rijsdijk, Silje Steinsbekk, Clare Llewellyn
Emotional overeating (EOE) is the tendency to eat more in response to negative emotions; its etiology in early life is unknown. We established the relative genetic and environmental influences on EOE in toddlerhood and early childhood. Data were from Gemini, a population-based cohort of 2,402 British twins born in 2007. EOE was measured using the "emotional overeating" scale of the Child Eating Behavior Questionnaire (CEBQ) at 16 months and 5 years. A longitudinal quantitative genetic model established that genetic influences on EOE were minimal; on the other hand, shared environmental influences explained most of the variance...
April 25, 2017: Child Development
Amilcare Parisi, Daniel Reim, Felice Borghi, Ninh T Nguyen, Feng Qi, Andrea Coratti, Fabio Cianchi, Maurizio Cesari, Francesca Bazzocchi, Orhan Alimoglu, Johan Gagnière, Graziano Pernazza, Simone D'Imporzano, Yan-Bing Zhou, Juan-Santiago Azagra, Olivier Facy, Steven T Brower, Zhi-Wei Jiang, Lu Zang, Arda Isik, Alessandro Gemini, Stefano Trastulli, Alexander Novotny, Alessandra Marano, Tong Liu, Mario Annecchiarico, Benedetta Badii, Giacomo Arcuri, Andrea Avanzolini, Metin Leblebici, Denis Pezet, Shou-Gen Cao, Martine Goergen, Shu Zhang, Giorgio Palazzini, Vito D'Andrea, Jacopo Desiderio
AIM: To investigate the role of minimally invasive surgery for gastric cancer and determine surgical, clinical, and oncological outcomes. METHODS: This is a propensity score-matched case-control study, comparing three treatment arms: robotic gastrectomy (RG), laparoscopic gastrectomy (LG), open gastrectomy (OG). Data collection started after sharing a specific study protocol. Data were recorded through a tailored and protected web-based system. Primary outcomes: harvested lymph nodes, estimated blood loss, hospital stay, complications rate...
April 7, 2017: World Journal of Gastroenterology: WJG
Qintang Li, Meihuan Yao, Xiu Yue, Xiao Chen
The aggregation behavior of quaternary ammonium gemini surfactants (12-s-12) in a protic ionic liquid, ethanolammonium nitrate (EOAN), was investigated by small-angle X-ray scattering, freeze-fracture transmission electron microscopy, polarized optical microscopy, and rheological measurements. The rarely reported nonaqueous two phases in the ionic liquid were observed at lower 12-s-12 concentrations. The upper phase was composed of micelles, whereas only the surfactant unimers or multimers were detected in the low phase...
April 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
M Al-Dulaymi, A El-Aneed
Diquaternary ammonium gemini surfactants have emerged as effective gene delivery vectors. A novel series of 11 peptide-modified compounds was synthesized, showing promising results in delivering genetic materials. The purpose of this work is to elucidate the tandem mass spectrometric (MS/MS) dissociation behavior of these novel molecules establishing a generalized MS/MS fingerprint. Exact mass measurements were achieved using a hybrid quadrupole orthogonal time-of-flight mass spectrometer, and a multi-stage MS/MS analysis was conducted using a triple quadrupole-linear ion trap mass spectrometer...
June 2017: Journal of Mass Spectrometry: JMS
Yan Zhang, Guohe Huang, Chunjiang An, Xiaying Xin, Xia Liu, Maya Raman, Yao Yao, Wenxia Wang, Mukesh Doble
From the view of economic efficiency and technology sustainability, biomass adsorbent has a high potential for pollution control. In the present study, the performance of gemini 12-2-12 surfactant-modified wheat bran (MWB) for the removal of anionic azo dyes from aqueous solution was investigated. A new insight was gained into the modification mechanism through synchrotron-assisted infrared analysis and molecular interaction simulation. The equilibrium and kinetic studies for the adsorption of Acid Red 18 (AR-18), Acid Orange 7 (AO-7) and Acid Black 1 (AB-1) on MWB were conducted...
October 1, 2017: Science of the Total Environment
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