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https://www.readbyqxmd.com/read/28737786/fluorescence-emission-originated-from-the-h-aggregated-cyanine-dye-with-chiral-gemini-surfactant-assemblies-having-a-narrow-absorption-band-and-a-remarkably-large-stokes-shift
#1
Naoya Ryu, Yutaka Okazaki, Emilie Pouget, Makoto Takafuji, Shoji Nagaoka, Hirotaka Ihara, Reiko Oda
We demonstrate that the fluorescence emission that originated from a cyanine dye forming H-aggregates with a narrow absorption band and a remarkably large Stokes shift can be induced by symmetry breaking. The H-aggregate formation was successfully induced using chirally assembled cationic gemini surfactants with enantiomeric tartrate counterions as templates in water.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28731344/correction-to-rational-design-and-synthesis-of-carboxylate-gemini-surfactants-with-an-excellent-aggregate-behavior-for-nano-la2o3-morphology-controllable-preparation
#2
Xueming Liao, Zhinong Gao, Yan Xia, Fei Niu, Wenzhong Zhai
No abstract text is available yet for this article.
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28722057/janus-particles-self-assembled-from-a-small-organic-atypical-asymmetric-gemini-surfactant
#3
Lei Tang, Jun Yang, Qinqin Yin, Linghui Yang, Deying Gong, Feng Qin, Junyang Liu, Qin Fan, Jiahong Li, Wenling Zhao, Weiyi Zhang, Jiyu Wang, Tao Zhu, Wensheng Zhang, Jin Liu
A series of atypical asymmetric gemini surfactants with an amphiphilic carbonate group (-O-CO-O-) have been prepared. Some of these compounds could self-assemble in water into gourd-shaped Janus particles (JPs). Initial results suggested that the formation of JPs was highly likely to be related to their atypical gemini surfactant structure. To our knowledge, this is the first report on JPs that are self-assembled from a single kind of small organic molecule. We believe that our results will be utilized in many fields...
July 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28715030/a-chiral-binol-based-gemini-amphiphilic-gelator-and-its-specific-discrimination-of-native-arginine-by-gelation-in-water
#4
Lihua Jia, Jianxin Yin, Xiangfeng Guo, Guangzhou Cao, Xuhua Tian, Bo Zhu, Lin Pu
A novel axially chiral cationic Gemini amphiphile gelator (S1) derived from (S)-BINOL has been synthesized and characterized by (1)H NMR, (13)C NMR, ESI-MS and FT-IR analyses. The critical micelle concentration (CMC) of S1 was determined to be 0.21 mM in water at room temperature. A transparent hydrogel with S1 at 43 mM was obtained at room temperature and characterized using various methods including SEM, CD, fluorescence, (1)H NMR, FT-IR, and XRD. The results indicate that the hydrophobic effect of long alkyl chains, π-π stacking of naphthalene rings, and intermolecular hydrogen-bonding of the amide groups of S1 should be responsible for the hydrogel formation...
July 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/28714228/polyladderane-constructed-from-gemini-monomer-via-photoreaction
#5
Zhihan Wang, Benjamin Miller, Jonathan Butz, Katelyn Randazzo, Zijun D Wang, Qianli Rick Chu
Polyladderane, the first polymer to contain the ladderane functional group, was successfully synthesized from gemini monomer through photoreaction in the solid state. The modular design of the gemini monomers used to create polyladderane allowed specific structural modification, resulting in the formation of two distinct polymer products. Monomers were synthesized by connecting two photoreactive units, either sorbic acids (monomer I) or 2-furanacrylic acids (monomer II), with a 1,4-butanediol linker. Single crystal X-ray diffraction analysis of the monomers confirmed that they packed in the desired head-to-tail orientation and within a viable distance for photoreaction by electronically-complementary interaction...
July 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28697732/an-assessment-of-equity-in-the-distribution-of-non-financial-health-care-inputs-across-public-primary-health-care-facilities-in-tanzania
#6
August Kuwawenaruwa, Josephine Borghi, Michelle Remme, Gemini Mtei
BACKGROUND: There is limited evidence on how health care inputs are distributed from the sub-national level down to health facilities and their potential influence on promoting health equity. To address this gap, this paper assesses equity in the distribution of health care inputs across public primary health facilities at the district level in Tanzania. METHODS: This is a quantitative assessment of equity in the distribution of health care inputs (staff, drugs, medical supplies and equipment) from district to facility level...
July 11, 2017: International Journal for Equity in Health
https://www.readbyqxmd.com/read/28697546/development-of-novel-anionic-gemini-surfactants-and-application-in-fabricating-hierarchical-silver-microparticles-for-surface-enhanced-raman-spectroscopy
#7
Yuming Cheng, Xiong Liu, Qiufen Lei, Xuefeng Li, Jinfeng Dong
In this work, a new category of anionic Gemini surfactants with a rigid space, disodium 2,2'-(1, 4-phenylene bis (methylene)) bis (alkane-1-sulfate) (CmArCm, m=8, 10, 12, 14), were developed. They showed excellent surface activity and remarkable micellization tendency in aqueous solutions as measured by the equilibrium surface tension method. It was noticed that both the surface activity and micellization ability of CmArCm were gradually strengthened upon increasing the hydrophobic chain length m. Those Gemini surfactants were employed as capping reagents to fabricate three-dimensional (3D) hierarchical silver microparticles (AgMPs) successfully even in a large-scale of gram-level...
June 22, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28694670/new-totally-intracorporeal-reconstructive-approach-after-robotic-total-gastrectomy-technical-details-and-short-term-outcomes
#8
Amilcare Parisi, Francesco Ricci, Alessandro Gemini, Stefano Trastulli, Roberto Cirocchi, Giorgio Palazzini, Vito D'Andrea, Jacopo Desiderio
AIM: To show outcomes of our series of patients that underwent a total gastrectomy with a robotic approach and highlight the technical details of a proposed solution for the reconstruction phase. METHODS: Data of gastrectomies performed from May 2014 to October 2016, were extracted and analyzed. Basic characteristics of patients, surgical and clinical outcomes were reported. The technique for reconstruction (Parisi Technique) consists on a loop of bowel shifted up antecolic to directly perform the esophago-enteric anastomosis followed by a second loop, measured up to 40 cm starting from the esojejunostomy, fixed to the biliary limb to create an enteroenteric anastomosis...
June 21, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28678285/new-ph-responsive-gemini-lipid-derived-co-liposomes-for-efficacious-doxorubicin-delivery-to-drug-resistant-cancer-cells
#9
Parikshit Moitra, Krishan Kumar, Sourav Sarkar, Paturu Kondaiah, Wei Duan, Santanu Bhattacharya
A gemini version of the amphiphile palmitoyl homocysteine was synthesized. Co-liposomes were prepared using the gemini along with a natural zwitterionic lipid, DOPE and cholesterol at specified ratios. This afforded pH-responsive co-liposomes which could efficiently transport the anticancer drug, doxorubicin (DOX), across the DOX-resistant HeLa cancer cells in response to low pH of cellular endosomes.
July 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28668583/pharmaceutical-versatility-of-cationic-niosomes-derived-from-amino-acid-based-surfactants-skin-penetration-behavior-and-controlled-drug-release
#10
Rita Muzzalupo, Lourdes Pérez, Aurora Pinazo, Lorena Tavano
The natural capability shown by cationic vesicles in interacting with negatively charged surfaces or biomolecules has recently attracted increased interest. Important pharmacological advantages include the selective targeting of the tumour vasculature, the promotion of permeation across cell membranes, as well as the influence of cationic vesicles on drug delivery. Accordingly, cationic amphiphiles derived from amino acids may represent an alternative to traditional synthetic cationic surfactants due to their lower cytotoxicity...
June 29, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28667829/rapid-and-simple-flow-injection-analysis-tandem-mass-spectrometric-fia-ms-ms-method-for-the-quantification-of-melphalan-in-lipid-based-drug-delivery-system
#11
Waleed Mohammed-Saeid, Deborah Michel, Ildiko Badea, Anas El-Aneed
The use of the anticancer drug melphalan is limited due to its poor water solubility. To address such limitation, it is incorporated within a novel delivery system using β-cyclodextrin-gemini surfactants (18:1βCDg). Herein, two fast and simple FIA-MS/MS methods are developed for the quantification of melphalan (Mel) within the drug delivery system so that the solubilization efficiency of the system can be assessed. FIA-MS/MS methods are developed using a triple quadrupole-linear ion trap mass spectrometer, equipped with electrospray ionization (ESI) in the positive ion mode...
July 1, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28654127/bio-camouflage-of-anatase-nanoparticles-explored-by-in-situ-high-resolution-electron-microscopy
#12
Ana R Ribeiro, Arijita Mukherjee, Xuan Hu, Shayan Shafien, Reza Ghodsi, Kun He, Sara Gemini-Piperni, Canhui Wang, Robert F Klie, Tolou Shokuhfar, Reza Shahbazian-Yassar, Radovan Borojevic, Luis A Rocha, José M Granjeiro
While titanium is the metal of choice for most prosthetics and inner body devices due to its superior biocompatibility, the discovery of Ti-containing species in the adjacent tissue as a result of wear and corrosion has been associated with autoimmune diseases and premature implant failures. Here, we utilize the in situ liquid cell transmission electron microscopy (TEM) in a liquid flow holder and graphene liquid cells (GLCs) to investigate, for the first time, the in situ nano-bio interactions between titanium dioxide nanoparticles and biological medium...
June 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28645658/spacer-structure-and-hydrophobicity-influences-transfection-activity-of-novel-polycationic-gemini-amphiphiles
#13
Pavel A Puchkov, Irina A Kartashova, Elena V Shmendel, Anastasya S Luneva, Nina G Morozova, Marina A Zenkova, Mikhail A Maslov
Three novel polycationic gemini amphiphiles with different spacers were developed and evaluated in terms of their physiochemical properties and transfection efficiencies. Cationic liposomes formed by these amphiphiles and the helper lipid DOPE were able to successfully condense DNA, as shown by gel mobility shift and ethidium bromide intercalation assays. Transfection activity of the liposomes was superior to Lipofectamine(®) 2000 and was dependent on spacer structure, hydrophobicity, and nucleic acid type (pDNA or siRNA)...
August 1, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28643235/design-and-evaluation-of-rgd-modified-gemini-surfactant-based-lipoplexes-for-targeted-gene-therapy-in-melanoma-model
#14
Waleed Mohammed-Saeid, Jackson Chitanda, Mays Al-Dulaymi, Ronald Verrall, Ildiko Badea
PURPOSE: We have developed and evaluated novel peptide-targeted gemini surfactant-based lipoplexes designed for melanoma gene therapy. METHODS: Integrin receptor targeting peptide, cyclic-arginylglycylaspartic acid (cRGD), was either chemically coupled to a gemini surfactant backbone or physically co-formulated with lipoplexes. Several formulations and transfection techniques were developed. Transfection efficiency and cellular toxicity of the lipoplexes were evaluated in an in vitro human melanoma model...
June 22, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28636319/green-catanionic-gemini-surfactant-lichenysin-mixture-improved-surface-antimicrobial-and-physiological-properties
#15
Albert Ruiz, Aurora Pinazo, Lourdes Pérez, Angeles Manresa, Ana M Marqués
Catanionic surfactant mixtures form a wide variety of organized assemblies and aggregates with improved physicochemical and biological properties. The green catanionic mixture N(α)N(ω)-Bis(N(α)caproylarginine) α,ω-propyldiamide (C3(CA)2):Lichenysin (molar ratio 8:2) showed antimicrobial synergies against Yersinia enterocolitica, Bacillus subtilis, Escherichia coli O157:H7, and Candida albicans. Flow cytometry and viability studies indicated that this catanionic mixture increases the probability of Y. enterocolitica (38...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28627875/preparation-of-gemini-surfactant-conjugated-polymer-aggregates-for-enhanced-fluorescence-and-bioimaging-application
#16
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 [sodium 2,6-didodecyl-4-hydroxy-2,6-diaza-1,7-heptanedicarboxylate (SDHC)] to adjust the aggregation behaviors and fluorescence properties of conjugated polymers [anionic poly(2-methoxy-5-propyloxy sulfonate phenylene vinylene) (MPS-PPV) and cationic poly(3-alkoxy-4-methylthiophene) (PMNT)]...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28622471/coacervate-of-polyacrylamide-and-cationic-gemini-surfactant-for-the-extraction-of-methyl-orange-from-aqueous-solution
#17
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 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28616191/towards-the-co-ordination-of-terrestrial-ecosystem-protocols-across-european-research-infrastructures
#18
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
https://www.readbyqxmd.com/read/28602185/the-synthesis-of-gemini-type-sulfobetaine-based-hybrid-monolith-and-its-application-in-hydrophilic-interaction-chromatography-for-small-polar-molecular
#19
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
https://www.readbyqxmd.com/read/28597883/the-effect-of-hydroxyl-on-the-solution-behavior-of-a-quaternary-ammonium-gemini-surfactant
#20
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
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