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https://www.readbyqxmd.com/read/28545054/an-optimized-small-animal-tumour-model-for-experimentation-with-low-energy-protons
#1
Elke Beyreuther, Kerstin Brüchner, Mechthild Krause, Margret Schmidt, Rita Szabo, Jörg Pawelke
BACKGROUND: The long-term aim of developing laser based particle acceleration towards clinical application requires not only substantial technological progress, but also the radiobiological characterization of the resulting ultra-short and ultra-intensive particle beam pulses. After comprehensive cell studies a mouse ear tumour model was established allowing for the penetration of low energy protons (~20 MeV) currently available at laser driven accelerators. The model was successfully applied for a first tumour growth delay study with laser driven electrons, whereby the need of improvements crop out...
2017: PloS One
https://www.readbyqxmd.com/read/28544977/environmental-radiation-dosimetry-at-argentine-antarctic-marambio-base-64%C3%A2-13-s-56%C3%A2-43-w-preliminary-results
#2
Alba Zanini, Vicente Ciancio, Monica Laurenza, Marisa Storini, Adolfo Esposito, Juan Carlos Terrazas, Paolo Morfino, Alessandro Liberatore, Gustavo Di Giovan
The preliminary results obtained in the first environmental radiation dosimetry campaign performed in the Antarctic region are presented. This experiment is carried out in the framework of CORA (COsmic Rays in Antarctica) Project, a collaboration between Argentine and Italian institutions. After a feasibility study performed in the Antarctic summer 2013, a new campaign has been carried out, started in March 2015, to measure various components of cosmic ray induced secondary atmospheric radiation at the Argentine Marambio Base (Antarctica; 196 m a...
May 22, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28544757/eight-electron-silver-and-mixed-gold-silver-nanoclusters-stabilized-by-se-donor-ligands
#3
Wan-Ting Chang, Po-Yi Lee, Jian-Hong Liao, Samia Kahlal, Jean-Yves Saillard, Chen-Wei Liu
The first atomically and structurally precise silver-nanoclusters stabilized by Se-donor ligands, [Ag20{Se2P(OiPr)2}12] (3) and [Ag21{Se2P(OEt)2}12]+(4), have been isolated by ligand replacement reaction of [Ag20{S2P(OiPr)2}12] (1) and [Ag21{S2P(OiPr)2}12]+ (2), respectively. Further, doping reactions of 4 with Au(PPh3)Cl resulted in the formation of [AuAg20{Se2P(OEt)2}12]+, (5). Structures of 3, 4 and 5 were determined by single crystal X-ray diffraction. The anatomy of cluster 3 with an Ag20 core having C3 symmetry is very similar to that of its dithiophosphate analogue 1...
May 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28544304/strong-improvement-of-long-term-chemical-and-thermal-stability-of-plasmonic-silver-nanoantennas-and-films
#4
Xiaolong Wang, Christian Santschi, Olivier J F Martin
Silver (Ag) nanostructures and thin films are advantageous plasmonic materials as they have significantly lower losses than gold (Au). Unfortunately, Ag nanostructures suffer from poor chemical and thermal stability, which limit their applications. Here, the mechanisms leading to the deterioration of Ag nanostructures are clarified. It is first shown that oxygen alone cannot oxidize Ag nanostructures. Then, experiments using X-ray photoelectron spectroscopy reveal that the amount of sulfur in ambient air is too low for efficient tarnishing of the Ag surface...
May 24, 2017: Small
https://www.readbyqxmd.com/read/28544213/bac-recombineering-of-the-agouti-loci-from-spotted-gar-and-zebrafish-reveals-the-evolutionary-ancestry-of-dorsal-ventral-pigment-asymmetry-in-fish
#5
Laura Cal, Manuel MegÍas, José Miguel Cerdá-Reverter, John H Postlethwait, Ingo Braasch, Josep Rotllant
Dorsoventral pigment patterning, characterized by a light ventrum and a dark dorsum, is one of the most widespread chromatic adaptations in vertebrate body coloration. In mammals, this countershading depends on differential expression of agouti-signaling protein (ASIP), which drives a switch of synthesis of one type of melanin to another within melanocytes. Teleost fish share countershading, but the pattern results from a differential distribution of multiple types of chromatophores, with black-brown melanophores most abundant in the dorsal body and reflective iridophores most abundant in the ventral body...
May 24, 2017: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
https://www.readbyqxmd.com/read/28544030/trapping-a-silicon-i-radical-with-carbenes-a-cationic-caac-silicon-i-radical-and-an-nhc-parent-silyliumylidene-cation
#6
Yan Li, Yuk-Chi Chan, Bi-Xiang Leong, Yongxin Li, Emma Richards, Indu Purushothaman, Susmita De, Pattiyil Parameswaran, Cheuk-Wai So
The trapping of a silicon(I) radical with N-heterocyclic carbenes is described. The reaction of the cyclic (alkyl)(amino) carbene [cAACMe ] (cAACMe =:C(CMe2 )2 (CH2 )NAr, Ar=2,6-iPr2 C6 H3 ) with H2 SiI2 in a 3:1 molar ratio in DME afforded a mixture of the separated ion pair [(cAACMe )2 Si:(.) ](+) I(-) (1), which features a cationic cAAC-silicon(I) radical, and [cAACMe -H](+) I(-) . In addition, the reaction of the NHC-iodosilicon(I) dimer [IAr (I)Si:]2 (IAr =:C{N(Ar)CH}2 ) with 4 equiv of IMe (:C{N(Me)CMe}2 ), which proceeded through the formation of a silicon(I) radical intermediate, afforded [(IMe )2 SiH](+) I(-) (2) comprising the first NHC-parent-silyliumylidene cation...
May 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28543928/li12p3n9-with-non-condensed-p3n9-12-rings-and-its-high-pressure-polymorph-li4pn3-with-infinite-chains-of-pn4-tetrahedra
#7
Wolfgang Schnick, Robin Niklaus, Eva-Maria Bertschler
Li12P3N9 was synthesized by solid-state reaction of Li3N and P3N5 at 790 °C. It is made up of non-condensed [P3N9]12- dreier-rings of PN4-tetrahedra. The high-pressure polymorph Li4PN3 of the latter was synthesized under high-pressure/high-temperature conditions from Li12P3N9 or LiPN2 and Li7PN4 at 6 or 7 GPa, respectively, using multianvil technique. Li4PN3 is the first lithium catena-nitridophosphate and contains PN3 zweier-chains of corner sharing PN4-tetrahedra. To confirm the structure elucidated from single-crystal X-ray data, Rietveld refinement, 6Li, 7Li and 31P solid-state NMR, FTIR spectroscopy and EDX measurements were carried out...
May 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28542288/structural-models-of-the-different-trimers-present-in-the-core-of-phycobilisomes-from-gracilaria-chilensis-based-on-crystal-structures-and-sequences
#8
Jorge Dagnino-Leone, Maximiliano Figueroa, Claudia Mella, María Alejandra Vorphal, Frédéric Kerff, Aleikar José Vásquez, Marta Bunster, José Martínez-Oyanedel
Phycobilisomes (PBS) are accessory light harvesting protein complexes that directionally transfer energy towards photosystems. Phycobilisomes are organized in a central core and rods radiating from it. Components of phycobilisomes in Gracilaria chilensis (Gch) are Phycobiliproteins (PBPs), Phycoerythrin (PE), and Phycocyanin (PC) in the rods, while Allophycocyanin (APC) is found in the core, and linker proteins (L). The function of such complexes depends on the structure of each component and their interaction...
2017: PloS One
https://www.readbyqxmd.com/read/28541948/attached-%C3%AE-cyclodextrin-%C3%AE-2-3-epoxypropoxy-propyl-trimethoxysilane-to-graphene-oxide-and-its-application-in-copper-removal
#9
Zongxue Yu, Qi Chen, Liang Lv, Yang Pan, Guangyong Zeng, Yi He
The environmental applications of graphene oxide and β-cyclodextrin (β-CD) have attracted great attention since their first discovery. Novel nanocomposites were successfully prepared by using an esterification reaction between β-cyclodextrin/γ-(2,3-epoxypropoxy) propyl trimethoxysilane grafted graphene oxide (β-CD/GPTMS/GO). The β-CD/GPTMS/GO nanocomposites were used to remove the Cu(2+) from aqueous solutions. The characteristics of β-CD/GPTMS/GO were detected by scanning electron microscopy (SEM), Fourier transform infrared, X-ray diffraction (XRD), thermogravimetric analysis (TG) and energy dispersive X-ray (EDX)...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28541945/application-of-scallop-shell-fe3o4-nanoparticles-for-the-removal-of-cr-vi-from-aqueous-solutions
#10
Azita Mohagheghian, Robabeh Vahidi-Kolur, Melina Pourmohseni, Jae-Kyu Yang, Mehdi Shirzad-Siboni
In this study, removal of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was investigated with variation of pH, adsorbent dosage, initial Cr(VI) concentration, ionic strength and temperature. Coating of Fe3O4 nanoparticles onto Scallop shell was identified by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The maximum adsorption was observed at pH 3. Removal efficiency of Cr(VI) was increased with increasing adsorbent dosage, but was decreased with increasing initial Cr(VI) concentration and temperature...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28541740/controlling-aedes-albopictus-and-culex-pipiens-pallens-using-silver-nanoparticles-synthesized-from-aqueous-extract-of-cassia-fistula-fruit-pulp-and-its-mode-of-action
#11
Hatem Fouad, Li Hongjie, Dawood Hosni, Jiqian Wei, Ghulam Abbas, Hassan Ga'al, Mo Jianchu
Mosquitoes act as key vector for transmission of devastating parasites and pathogens which affect millions of people globally. In this research, the green synthesis of silver nanoparticles of Cassia fistula fruit pulp as an innovative and operative tool against vector mosquitoes is presented. Silver nanoparticles were characterized by a series of techniques including Fourier transform infrared spectroscopy, Transmission Electron Microscope and confirmed by Scanning Electron Microscope, UV-Vis spectrophotometry and X-ray diffraction...
May 25, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28541701/local-enhancement-of-polarization-at-pbtio3-bifeo3-interfaces-mediated-by-charge-transfer
#12
Ying Liu, Yinlian Zhu, Yunlong Tang, Yujia Wang, Yixiao Jiang, Yaobin Xu, Bin Zhang, Xiuliang Ma
Ferroelectrics hold promise for sensors, transducers, and telecommunications. With the demand of electronic devices scaling down, they take the form of nanoscale films. However, the polarizations in ultrathin ferroelectric films are usually reduced dramatically due to the depolarization field caused by incomplete charge screening at interfaces, hampering the integrations of ferroelectrics into electric devices. Here, we design and fabricate a ferroelectric/multiferroic BiFeO3/PbTiO3 system, which exhibits discontinuities in both chemical valence and ferroelectric polarization across the interface...
May 25, 2017: Nano Letters
https://www.readbyqxmd.com/read/28541692/stable-chloro-and-bromoxenate-cage-anions-x3-xeo3-3-3-and-x4-xeo3-4-4-x-cl-or-br
#13
James T Goettel, Veit Haensch, Gary J Schrobilgen
The number of isolable compounds which contain different noble-gas-element bonds is limited for xenon and even more so for krypton. Examples of Xe-Cl bonds are rare and prior to this work, no definitive evidence for a Xe-Br bonded compound existed. The syntheses, isolation, and characterization of the first compounds to contain Xe-Br bonds and their chlorine analogues are described in the present work. The reactions of XeO3 with [N(CH3)4]Br and [N(C2H5)4]Br have provided two bromoxenate salts, [N(C2H5)4][Br3(XeO3)3] and [N(CH3)4][Br4(XeO3)4], in which the cage anions have Xe-Br bond lengths that range from 3...
May 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28541690/bioactive-glycosides-from-the-twigs-of-litsea-cubeba
#14
Ling-Yan Wang, Ming-Hua Chen, Jiang Wu, Hua Sun, Wei Liu, Yu-Hong Qu, Yan-Cheng Li, Yu-Zhuo Wu, Rui Li, Dan Zhang, Su-Juan Wang, Sheng Lin
The air-dried twigs of Litsea cubeba, a traditional Chinese medicinal tree, afforded 10 new aromatic glycosides (1-10) and 26 known analogues. Their structures were assigned by extensive 1D and 2D NMR experiments, and the absolute configurations were resolved by chemical methods, electronic circular dichroism, specific rotation, and X-ray crystallographic analysis. Compound 4 is the first example of a naturally occurring homoneolignan glucoside. Compounds 4, 6-8, and the known neolignan glucosides (11, 12, and 14) at respective 10 μM concentrations were found to reduce acetaminophen-induced HepG2 cell injury with 30...
May 25, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28540400/imaging-of-cerebral-ischemic-edema-and-neuronal-death
#15
REVIEW
Rüdiger von Kummer, Imanuel Dzialowski
PURPOSE: In acute cerebral ischemia, the assessment of irreversible injury is crucial for treatment decisions and the patient's prognosis. There is still uncertainty how imaging can safely differentiate reversible from irreversible ischemic brain tissue in the acute phase of stroke. METHODS: We have searched PubMed and Google Scholar for experimental and clinical papers describing the pathology and pathophysiology of cerebral ischemia under controlled conditions...
May 24, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28540376/on-the-local-order-of-amorphous-la2mo2o6-7
#16
Jesús Vega-Castillo, Gaëtan Buvat, Gwenaël Corbel, Abdelhadi Kassiba, Philippe Lacorre, Alberto Caneiro
The amorphous reduction product of the oxide ion conductor La2Mo2O9 was previously shown to be a good, sulphur-tolerant, anode material for solid oxide fuel cell devices (X. C. Lu, J. H. Zhu, J. Electrochem. Soc., 2008, 155(10), B1053). In this paper, we study the local order of amorphous La2Mo2O6.7 using X-ray absorption spectroscopy analyses and electronic paramagnetic resonance. The extended X-ray absorption fine structure analysis of local arrangements around Mo in La2Mo2O6.7 is first carried out on the basis of strong distortions from three crystalline models of La2Mo2O9, La7Mo7O30 and La2Mo2O7...
May 25, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28539853/treatment-of-cancer-and-inflammation-with-low-dose-ionizing-radiation-three-case-reports
#17
Shuji Kojima, Mitsutoshi Tsukimoto, Noriko Shimura, Hironobu Koga, Akishisa Murata, Tsuyoshi Takara
There is considerable evidence from experimental studies in animals, as well as from clinical reports, that low-dose radiation hormesis is effective for the treatment of cancer and ulcerative colitis. In this study, we present 3 case reports that support the clinical efficacy of low-dose radiation hormesis in patients with these diseases. First, a patient with prostate cancer who had undergone surgical resection showed a subsequent increase in prostate-specific antigen (PSA). His PSA value started decreasing immediately after the start of repeated low-dose X-ray irradiation treatment and remained low thereafter...
January 2017: Dose-response: a Publication of International Hormesis Society
https://www.readbyqxmd.com/read/28539250/target-residence-time-guided-optimization-on-ttk-kinase-results-in-inhibitors-with-potent-anti-proliferative-activity
#18
Joost C M Uitdehaag, Jos de Man, Nicole Willemsen-Seegers, Martine B W Prinsen, Marion A A Libouban, Jan Gerard Sterrenburg, Joeri J P de Wit, Judith R F de Vetter, Jeroen A D M de Roos, Rogier C Buijsman, Guido J R Zaman
The protein kinase TTK (Mps1) is a critical component of the spindle assembly checkpoint and a promising drug target for treatment of aggressive cancers, such as triple negative breast cancer. While the first TTK inhibitors have entered clinical trials, little is known about how the inhibition of TTK with small molecule compounds affects cellular activity. We studied the selective TTK inhibitor NTRC 0066-0, which was developed in our own laboratory, together with eleven TTK inhibitors developed by other companies, including Mps-BAY2b, BAY 1161909, BAY 1217389 (Bayer), TC-Mps1-12 (Shionogi), and MPI-0479605 (Myrexis)...
May 21, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28537382/in-situ-monitoring-of-the-mechanosynthesis-of-the-archetypal-metal-organic-framework-hkust-1-effect-of-liquid-additives-on-the-milling-reactivity
#19
Tomislav Stolar, Lisa Batzdorf, Stipe Lukin, Dijana Žilić, Cristina Motillo, Tomislav Friščić, Franziska Emmerling, Ivan Halasz, Krunoslav Užarević
We have applied in situ monitoring of mechanochemical reactions by high-energy synchrotron powder X-ray diffraction to study the role of liquid additives on the mechanochemical synthesis of the archetypal metal-organic framework (MOF) HKUST-1, which was one of the first and is still among the most widely investigated MOF materials to be synthesized by solvent-free procedures. It is shown here how the kinetics and mechanisms of the mechanochemical synthesis of HKUST-1 can be influenced by milling conditions and additives, yielding on occasion two new and previously undetected intermediate phases containing a mononuclear copper core, and that finally rearrange to form the HKUST-1 architecture...
May 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28537079/green-water-dispersible-photoluminescent-on-off-on-probe-for-selective-detection-of-fluoride-ions
#20
Pallavi Singhal, Bal Govind Vats, Sanjay Kumar Jha, Suman Neogy
Considering the high toxicity and widespread availability of fluoride ion in different environmental matrices, it is imperative to design a probe for its detection. In view of this a selective fluorescent on-off-on probe based on carbon quantum dots (CQDs) and Eu3+ has been designed. We have synthesized water soluble carboxylic acid functionalized CQDs and monitored its interaction with Eu3+. On addition of Eu3+ ions luminescence quenching in CQDs emission was observed (switch-off). We investigate the reason for this luminescence quenching using time resolved emission and high resolution transmission electron microscopy (HRTEM) studies and observed that both electron transfer from CQDs to Eu3+ and aggregation of CQDs are responsible for luminescence quenching...
May 24, 2017: ACS Applied Materials & Interfaces
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