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https://www.readbyqxmd.com/read/28094505/self-assembly-and-disassembly-of-amphiphilic-zwitterionic-perylenediimide-vesicles-for-cell-membrane-imaging
#1
Yong Ye, Yang Zheng, Chendong Ji, Jie Shen, Meizhen Yin
Animal cells have complicated dynamics of cell membrane structures which require desirable dyes to in vivo imaging. Here, an asymmetric amphiphilic zwitterionic perylenediimide (ZP) has been constructed by introducing an octyl chain and a zwitterionic head to each imide position of perylenediimide chromophore. ZP can self-assemble into vesicles in aqueous solution. The aggregated ZP vesicles have been explored to image cell inner or surface membrane structures by controlled disassembly process. The ZP vesicles, when are uptaken into cells, disassemble into single molecules and incorporate into cell inner membranes...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094407/c-h-imidation-a-distinct-perspective-of-c-n-bond-formation
#2
REVIEW
Raja K Rit, Majji Shankar, Akhila K Sahoo
The direct imidation strategy proficiently constructs C-N bonds and creates the useful amine functional group in the molecular template. This review briefly discusses the synthetic methods developed for the direct imidation of unactivated C(sp(2)/sp(3)/sp)-H bonds. Transition-metal catalysts, metal-free processes, and/or photo-induced methods are invariably employed for accomplishing C-H imidation transformations. The contents summarized herein would benefit the research community to use the C-H imidation reactions for broad synthetic applications and to unravel novel C-N bond forming processes...
January 17, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28093907/diastereoselective-electrophilic-%C3%AE-hydroxyamination-of-n-tert-butanesulfinyl-imidates
#3
Peng-Ju Ma, Hui Liu, Chong-Dao Lu, Yan-Jun Xu
Diastereoselective α-hydroxyamination of N-tert-butanesulfinyl imidates using nitrosoarenes is reported. A catalytic amount of base effectively promotes the hydroxyamination reaction of α-aryl-substituted imidates, and the resulting α-hydroxyamino imidates can be transformed into a range of synthetically useful intermediates.
January 17, 2017: Organic Letters
https://www.readbyqxmd.com/read/28091605/cubosomes-from-hierarchical-self-assembly-of-poly-ionic-liquid-block-copolymers
#4
Hongkun He, Khosrow Rahimi, Mingjiang Zhong, Ahmed Mourran, David R Luebke, Hunaid B Nulwala, Martin Möller, Krzysztof Matyjaszewski
Cubosomes are micro- and nanoparticles with a bicontinuous cubic two-phase structure, reported for the self-assembly of low molecular weight surfactants, for example, lipids, but rarely formed by polymers. These objects are characterized by a maximum continuous interface and high interface to volume ratio, which makes them promising candidates for efficient adsorbents and host-guest applications. Here we demonstrate self-assembly to nanoscale cuboidal particles with a bicontinuous cubic structure by amphiphilic poly(ionic liquid) diblock copolymers, poly(acrylic acid)-block-poly(4-vinylbenzyl)-3-butyl imidazolium bis(trifluoromethylsulfonyl)imide, in a mixture of tetrahydrofuran and water under optimized conditions...
January 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28076768/microscopic-solvation-environments-in-a-prototype-room-temperature-ionic-liquid-as-elucidated-by-resonance-raman-spectroscopy-of-iodine-and-bromine
#5
Satyen Saha, Hajime Okajima, Osamu Homma, Hiro-O Hamaguchi
Microscopic solvation environments in a prototype ionic liquid, bmimTf2N; 1-butyl-3-methyl-imidazolium-bis(trifluoromethanesulfonyl)imide, have been studied with the use of halides, X2 and Xn(-) (X=I, Br; n=3,5), as molecular probes. Resonance Raman spectroscopy has been used to detect these halogen species existing in bmimTf2N as well as in reference solvents including heptane, cyclohexane, KX/H2O and benzene. In heptane and cyclohexane, only free X2 species are detected. In KX/H2O, only Xn(-) and, in benzene, only benzene-X2 complexes are detected...
January 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28070696/an-ionic-liquid-based-strain-sensor-for-large-displacement-measurement
#6
Grim Keulemans, Frederik Ceyssens, Robert Puers
A robust and low cost ionic liquid based strain sensor is fabricated for high strain measurements in biomedical applications (up to 40 % and higher). A tubular 5 mm long silicone microchannel with an inner diameter of 310 µm and an outer diameter of 650 µm is filled with an ionic liquid. Three ionic liquids have been investigated: 1-butyl-1-methylpyrrolidinium bis (trifluoromethylsulfonyl) imide, ethylammonium nitrate and cholinium ethanoate. When the channel is axially stretched, geometrical deformations change the electrical impedance of the liquid channel...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28070072/effect-of-casting-solvent-on-interfacial-molecular-structure-and-proton-transport-characteristics-of-sulfonated-polyimide-thin-films
#7
Yuki Nagao, Karthik Krishnan, Ryosuke Goto, Mitsuo Hara, Shusaku Nagano
Two sulfonated polyimide (SPI) thin films were prepared with water and THF/water mixed solvents, respectively. The SPI thin film prepared with THF/water showed more than 5 times higher proton conductivity than that prepared with water mixed solvent at low relative humidity (RH) and 298 K. In this study, polarized optical microscopy (POM), grazing incidence small angle X-ray scattering (GISAXS), and p-polarized multiple angle incidence resolution spectrometry (pMAIRS) were carried out to investigate liquid crystalline (LC) optical ordered structure, organized structure, and molecular orientation...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28068086/enhanced-lithium-ion-transport-in-poly-ethylene-glycol-diacrylate-supported-solvate-ionogel-electrolytes-via-chemically-cross-linked-ethylene-oxide-pathways
#8
Anthony J D'Angelo, Matthew J Panzer
Lithium-ion solvate ionic liquids (SILs), consisting of complexed Li(+) cations and a weakly basic anion, represent an emergent class of nonvolatile liquid electrolytes suitable for lithium-based electrochemical energy storage. In this report, solid-state, flexible solvate ionogel electrolytes are synthesized via UV-initiated free radical polymerization/cross-linking of poly(ethylene glycol) diacrylate (PEGDA) in situ within the [Li(G4)][TFSI] electrolyte, which is formed by an equimolar mixture of lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) and tetraglyme (G4)...
January 9, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28067499/ultraconcentrated-sodium-bis-fluorosulfonyl-imide-based-electrolytes-for-high-performance-sodium-metal-batteries
#9
Jaegi Lee, Yongwon Lee, Jeongmin Lee, Sang-Min Lee, Jeong-Hee Choi, Hyungsub Kim, Mi-Sook Kwon, Kisuk Kang, Kyu Tae Lee, Nam-Soon Choi
We present an ultraconcentrated electrolyte composed of 5 M sodium bis(fluorosulfonyl)imide in 1,2-dimethoxyethane for Na metal anodes coupled with high-voltage cathodes. Using this electrolyte, a very high Coulombic efficiency of near 100% for Na plating/stripping is obtained in Na/stainless steel (SS) cells, with highly reduced corrosivity toward Na metal and high oxidation durability (over 4.9 V versus Na/Na+) without corrosion of the aluminum cathode current collector. Importantly, the use of this ultraconcentrated electrolyte results in substantially improved rate capability in Na/SS cells and excellent cycling performance in Na/Na symmetric cells without the increase of polarization...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28061985/multiple-myeloma-epidemiology-and-survival-a-unique-malignancy
#10
REVIEW
Dickran Kazandjian
Multiple myeloma (MM), although a rare disease, is the second most common hematologic malignancy. It is found in the spectrum of plasma cell dyscrasias, which begins with monoclonal gammopathy of unknown significance (MGUS) to overt plasma cell leukemia and extramedullary myeloma. MM is associated with significant morbidity due to its end-organ destruction. It is a disease of the older population and its incidence in the African American population is twice that of the European American population. Improvements in the treatment of MM in the past couple of decades, beginning with the use of autologous stem cell transplantation followed by availability of novel treatments such as immunomodulatory drugs (ImIDs) and proteasome inhibitors (PIs) has transformed the natural history of the disease leading to longer survival times...
December 2016: Seminars in Oncology
https://www.readbyqxmd.com/read/28058832/keggin-type-pmo11v-as-a-p-type-dopant-for-enhancing-the-efficiency-and-reproducibility-of-perovskite-solar-cells
#11
Guohua Dong, Debin Xia, Yulin Yang, Li Shenga, Tengling Ye, Ruiqing Fan
The conventional perovskite solar cells (PSCs) with 2,2',7,7'-tetrakis(N,N-dimethoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) as a hole transporting material commonly suffer from poor stability and reproducibility mainly due to the process of placing the devices in air and illumination for oxidizing the spiro-OMeTAD. Herein, Keggin-type polyoxometalates (POMs)-phosphovanadomolybdate (H4PMo11V·nH2O, denoted as PMo11V) is for the first time employed as a p-type dopant for promoting the oxidation of spiro-OMeTAD...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28054060/n-ethyl-n-methylpyrrolidinium-bis-fluorosulfonyl-imide-electrospun-polyvinylidene-fluoride-composite-electrolytes-characterization-and-lithium-cell-studies
#12
Yundong Zhou, Xiaoen Wang, Haijin Zhu, Michel Armand, Maria Forsyth, George W Greene, Jennifer M Pringle, Patrick C Howlett
Using the organic ionic plastic crystal N-ethyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide ([C2mpyr][FSI]) with electrospun nanofibers, LiFSI doped [C2mpyr][FSI]-PVdF composites were developed as solid state, self-standing electrolyte membranes. Different lithium salt concentration were investigated, with 10 mol% LiFSI found to be optimal amongst those assessed. Composites with different weight ratios of plastic crystal and polymer were prepared and 10 wt% polymer gave the highest conductivity. In addition, the effects of PVdF incorporation on the morphological, thermal, and structural properties of the organic ionic plastic crystal were investigated...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28052520/ikaros-expression-in-distinct-bone-marrow-cell-populations-as-a-candidate-biomarker-for-outcome-with-lenalidomide-dexamethasone-therapy-in-multiple-myeloma
#13
Arnold Bolomsky, Wolfgang Hübl, Stefano Spada, Ercan Müldür, Karin Schlangen, Daniel Heintel, Alberto Rocci, Adalbert Weißmann, Veronique Fritz, Martin Willheim, Niklas Zojer, Antonio Palumbo, Heinz Ludwig
Immunomodulatory drugs (IMiDs) are a cornerstone in the treatment of multiple myeloma (MM), but specific markers to predict outcome are still missing. Recent work pointed to a prognostic role for IMiD target genes (e.g. CRBN). Moreover, indirect activity of IMiDs on immune cells correlated with outcome, raising the possibility that cell populations in the bone marrow (BM) microenvironment could serve as biomarkers. We therefore analysed gene expression levels of six IMiD target genes in whole BM samples of 44 myeloma patients treated with lenalidomide-dexamethasone...
January 4, 2017: American Journal of Hematology
https://www.readbyqxmd.com/read/28052189/electrochemical-capture-and-release-of-carbon-dioxide-using-a-disulfide-thiocarbonate-redox-cycle
#14
Poonam Singh, Joseph H Rheinhardt, Jarred Z Olson, Pilarisetty Tarakeshwar, Vladimiro Mujica, Daniel A Buttry
We describe a new electrochemical cycle that enables capture and release of carbon dioxide. The capture agent is benzylthiolate (RS-), generated electrochemically by reduction of benzyldisulfide (RSSR). Reaction of RS- with CO2 produces a terminal, sulfur-bound monothiocarbonate, RSCO2-, which acts as the CO2 carrier species, much the same as a carbamate serves as the CO2 carrier for amine-based capture strategies. Oxidation of the thiocarbonate releases CO2 and regenerates RSSR. The newly reported S-benzylthiocarbonate (IUPAC name benzylsulfanylformate) is characterized by 1H and 13C NMR, FTIR and electrochemical analysis...
January 4, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28049333/structure-and-dynamics-of-ionic-liquids-trimethylsilylpropyl-substituted-cations-and-bis-sulfonyl-amide-anions
#15
Boning Wu, Yuki Yamashita, Takatsugu Endo, Kenji Takahashi, Edward W Castner
Ionic liquids with cationic organosilicon groups have been shown to have a number of useful properties, including reduced viscosities relative to the homologous cations with hydrocarbon substituents on the cations. We report structural and dynamical properties of four ionic liquids having a trimethylsilylpropyl functional group, including 1-methyl-3-trimethylsilylpropylimidazolium (Si-C3-mim(+)) cation paired with three anions: bis(fluorosulfonyl)imide (FSI(-)), bis(trifluoromethanesulfonyl)imide (NTf2(-)), and bis(pentafluoroethanesulfonyl)imide (BETI(-)), as well as the analogous N-methyl-N-trimethylsilylpropylpyrrolidinium (Si-C3-pyrr(+)) cation paired with NTf2(-)...
December 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28028022/multiple-myeloma-cells-capacity-to-decompose-h2o2-determines-lenalidomide-sensitivity
#16
Sinto Sebastian, Yuan X Zhu, Esteban Braggio, Chang-Xin Shi, Sonali C Panchabhai, Scott A Van Wier, Greg J Ahmann, Marta Chesi, P Leif Bergsagel, A Keith Stewart, Rafael Fonseca
Lenalidomide is an immunomodulatory drug (IMiDs) with clinical efficacy in multiple myeloma (MM) and other late B-cell neoplasms. Although cereblon (CRBN) is an essential requirement for IMiD action, the complete molecular and biochemical mechanisms responsible for lenalidomide-mediated sensitivity or resistance remain unknown. Here, we report that IMiDs work primarily via inhibition of peroxidase-mediated intracellular H2O2 decomposition in MM cells. MM cells with lower H2O2-decomposition capacity were more vulnerable to lenalidomide-induced H2O2 accumulation and associated cytotoxicity...
December 27, 2016: Blood
https://www.readbyqxmd.com/read/28026177/influence-of-anion-delocalization-on-electron-transfer-in-a-covalent-porphyrin-donor-perylenediimide-dimer-acceptor-system
#17
Patrick E Hartnett, Catherine M Mauck, Michelle A Harris, Ryan M Young, Yi-Lin Wu, Tobin J Marks, Michael R Wasielewski
Photodriven electron transfer from a donor excited state to an assembly of electronically coupled acceptors has been proposed to enhance charge transfer efficiency in functional organic electronic materials. However, the circumstances under which this may occur are difficult to investigate in a controlled manner in disordered donor-acceptor materials. Here we investigate the effects of anion delocalization on electron transfer using zinc meso-tetraphenylporphyrin (ZnTPP) as a donor and a perylene-3,4:9,10-bis(dicarboximide) dimer as the acceptor (PDI2)...
January 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28026152/harnessing-three-dimensional-anatomy-of-graphene-foam-to-induce-superior-damping-in-hierarchical-polyimide-nanostructures
#18
Pranjal Nautiyal, Benjamin Boesl, Arvind Agarwal
Graphene foam-based hierarchical polyimide composites with nanoengineered interface are fabricated in this study. Damping behavior of graphene foam is probed for the first time. Multiscale mechanisms contribute to highly impressive damping in graphene foam. Rippling, spring-like interlayer van der Waals interactions and flexing of graphene foam branches are believed to be responsible for damping at the intrinsic, interlayer and anatomical scales, respectively. Merely 1.5 wt% graphene foam addition to the polyimide matrix leads to as high as ≈300% improvement in loss tangent...
December 27, 2016: Small
https://www.readbyqxmd.com/read/28024514/-advances-of-crbn-in-immunomodulatory-drugs-for-multiple-myeloma-review
#19
Ran An, Jian Hou
Multiple myeloma is a plasma cell malignant clone proliferation diseases and has been remained incurable. In the resent years, the widespread application of immunomodulatory drugs (IMiD) have made a great progress in the treatment of multiple myeloma, greatly improved the complete remission rate and prolonged the overall survival of MM patients. According to recent researches, CRBN (cereblon) plays an important role in mediating anti-myeloma effects of IMiD, and its expression correlated with the effect of IMiD treatment and the prognosis of multiple myeloma...
December 2016: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/28012677/a-noninterventional-observational-registry-of-patients-with-multiple-myeloma-treated-with-lenalidomide-in-taiwan
#20
Shang-Yi Huang, Yuan-Bin Yu, Su-Peng Yeh, Tsai-Yun Chen, Woei-Yau Kao, Chih-Cheng Chen, Ming-Chung Wang, Hsuan-Yu Lin, Sheng-Fung Lin, Tseng-Hsi Lin, Ye Hua, Marie Puccio-Pick, Dena DeMarco, Christian Jacques, Po Dunn
BACKGROUND/PURPOSE: The incidence of multiple myeloma in Asia has risen in the past 30 years. Lenalidomide, an IMiD immunomodulatory agent, has improved the overall survival in patients with relapsed/refractory multiple myeloma (RRMM) when used with dexamethasone versus dexamethasone alone. This observational registry (T-CC-MM-009; NCT01752075) assessed the safety and efficacy of lenalidomide plus dexamethasone in a large Chinese population of patients with RRMM. METHODS: This registry followed the first 100 patients treated with lenalidomide plus dexamethasone in Taiwan...
December 21, 2016: Journal of the Formosan Medical Association, Taiwan Yi Zhi
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