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https://www.readbyqxmd.com/read/28088631/an-esipt-based-two-photon-fluorescent-probe-detection-of-hydrogen-peroxide-in-live-cells-and-tissues
#1
Liyi Zhou, Yongbo Peng, Qianqian Wang, Qinlu Lin
A variety of diseases associated with human aging, which have a strong oxidative stress, but connecting age-related diseases and oxidative stress of the basic molecular mechanisms still insufficiently understood. Oxidative stress origins from the unregulated production of reactive oxygen species (ROS), and oxidative damaging to tissues and organs from subsequent oxidation-reduction chemistry by cellular mismanagement. In particular, H2O2 is a major by-product of ROS in live organisms and a common marker for oxidative stress, and its dynamic equilibrium can have various physiological and pathological consequences...
January 9, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28088564/doping-and-vacancy-effects-of-graphyne-on-so2-adsorption
#2
Sunkyung Kim, Jin Yong Lee
The adsorption of sulfur dioxide (SO2) on pristine and modified graphyne (including boron- or nitrogen- doping and introducing a single carbon atom defect) was investigated by density functional theory calculations. The structural, electronic, and magnetic properties of graphyne were changed according to the dopant atom site of doping and vacancy. SO2 adsorption was obviously affected by modification of graphyne. SO2 weakly interacted with pristine and nitrogen-doped graphynes. Boron doping at the sp-hybridized carbon site and introducing a single carbon atom vacancy in graphyne brought about a dramatic enhancement in SO2 adsorption...
January 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088230/relationship-between-the-uptake-of-18-f-borono-l-phenylalanine-and-l-methyl-11-c-methionine-in-head-and-neck-tumors-and-normal-organs
#3
Yoshiaki Watanabe, Hiroaki Kurihara, Jun Itami, Ryohei Sasaki, Yasuaki Arai, Kazuro Sugimura
BACKGROUND AND PURPOSE: The purpose of this study was to determine the distribution of 4-borono-2-(18)F-fluoro-phenylalanine ((18)F-BPA) and L-[methyl-(11)C] methionine ((11)C-Met) in normal organs and tumors and to evaluate the usefulness of (11)C-Met/PET in screening potential candidates for boron neutron capture therapy (BNCT). MATERIAL METHODS: Seven patients who had at least one histologically confirmed head and neck tumor were included in this study. They underwent both whole-body (18)F-BPA-PET/CT and (11)C-Met-PET/CT within a span of 6 months...
January 14, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28088019/melatonin-and-resveratrol-reverse-the-toxic-effect-of-high-boron-b-and-modulate-biochemical-parameters-in-pepper-plants-capsicum-annuum-l
#4
Eleana Sarafi, Pavlos Tsouvaltzis, Christos Chatzissavvidis, Anastasios Siomos, Ioannis Therios
The objectives of this research were to test a possible involvement of melatonin (MEL) and resveratrol (RES) in restoring growth and to control boron (B) toxicity in peppers. The plants were subjected to four different nutrient solution treatments as following: 1) half-strength Hoagland's nutrient solution (Control), 2) half-strength Hoagland's nutrient solution+100 μM B (100 μMB), 3) half-strength Hoagland's nutrient solution+100 μM boron+100 μMresveratrol (100 μMRES), and 4) half-strength Hoagland's nutrient solution+100 μM B+1 μMmelatonin (1 μM MEL)...
December 23, 2016: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28087882/cooperatively-interlocked-2-1-type-%C3%AF-system-anion-complexes
#5
Ryohei Yamakado, Yukina Ashida, Ryuma Sato, Yasuteru Shigeta, Nobuhiro Yasuda, Hiromitsu Maeda
As fascinating examples of closely connected multiple π-electronic systems involving noncovalent interactions, the cooperatively interlocked [2+1]-type anion complexes of well-designed π-electronic molecules are reported. The anion-responsive π-electronic molecules investigated in this study are the boron complexes of dipyrrolyldiketones bearing arylethynyl moieties at the pyrrole α-positions. Diverse substituents were introduced at the terminal aryl moieties, thus controlling the cooperativity to form [2+1]-type complexes...
January 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28087364/aquaglyceroporins-are-the-entry-pathway-of-boric-acid-in-trypanosoma-brucei
#6
Sabrina Marsiccobetre, Alexis Rodríguez-Acosta, Florian Lang, Katherine Figarella, Néstor L Uzcátegui
The boron element possesses a range of different effects on living beings. It is essential to beneficial at low concentrations, but toxic at excessive concentrations. Recently, some boron-based compounds have been identified as promising molecules against Trypanosoma brucei, the causative agent of sleeping sickness. However, until now, the boron metabolism and its access route into the parasite remained elusive. The present study addressed the permeability of T. brucei aquaglyceroporins (TbAQPs) for boric acid, the main natural boron species...
January 10, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28081476/electron-spin-relaxation-of-a-boron-containing-heterocyclic-radical
#7
Sandra S Eaton, Kirby Huber, Hanan Elajaili, Joseph McPeak, Gareth R Eaton, Lauren E Longobardi, Douglas W Stephan
Preparation of the stable boron-containing heterocyclic phenanthrenedione radical, (C6F5)2B(O2C14H8), by frustrated Lewis pair chemistry has been reported recently. Electron paramagnetic resonance measurements of this radical were made at X-band in toluene:dichloromethane (9:1) from 10 to 293K, in toluene from 180 to 293K and at Q-band at 80K. In well-deoxygenated 0.1mM toluene solution at room temperature hyperfine splittings from (11)B, four pairs of (1)H, and 5 pairs of (19)F contribute to an EPR spectrum with many resolved lines...
December 30, 2016: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28081005/mechanical-properties-and-failure-behavior-of-phosphorene-with-grain-boundaries
#8
V Sorkin, Y W Zhang
Using the density-functional tight-binding method, we studied the effect of grain boundaries on the mechanical properties and failure behavior of phosphorene. We found that the high-angle tilt boundaries with a higher density of (5∣7) defect pairs (oriented along the armchair direction) are stronger than the low-angle tilt boundaries with a lower defect density, and similarly the high-angle boundaries with a higher density of (4∣8) defect pairs (oriented along the zigzag direction) are stronger than the low-angle boundaries with a lower defect density...
January 12, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28080031/a-new-approach-to-sensitize-antitumor-monofunctional-platinum-ii-complexes-via-short-time-photo-irradiation
#9
Xuling Xue, Chengcheng Zhu, Huachao Chen, Yang Bai, Xiangchao Shi, Yang Jiao, Zhongyan Chen, Yupeng Miao, Weijiang He, Zijian Guo
Sensitizing the antitumor activity of monofunctional Pt(II) complexes is a reliable approach to developing antitumor agents different from the classic Pt-based drugs. Considering the poor intracellular accumulation of monofunctional Pt(II) complexes, in this study, the photosensitizing monofunctional Pt(II) complex Pt-BA was derived from a weak BODIPY (boron-dipyrromethene)-derived photosensitizer BA, with the purpose to improve its antitumor cytotoxicity via enhancing its intracellular accumulation with a short time photo-irradiation...
December 6, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/28079985/one-pot-bimetallic-pd-cu-catalyzed-synthesis-of-sulfonamides-from-boronic-acids-dabso-and-o-benzoyl-hydroxylamines
#10
Tao Tu, Haibo Zhu, Yajing Shen, Qinyue Deng, Changyu Huang
A practical and straightforward bimetallic Pd-Cu catalytic system has been successfully developed for synthesis of sulfonamides in one-pot manner from easily handle and readily available boronic acids, sulfur dioxide surrogate DABSO and O-benzoyl hydroxylamines in high yields. Without additional ligands, the newly developed catalytic system reveals a broad substrate scope for both partners and tolerates a wide array of functional groups even at low catalyst loadings. Furthermore, based on the control experiments, a plausible mechanism has been proposed, in which sodium sulfinate has been isolated and identified as the crucial intermediate for this straightforward bimetallic catalytic transformation...
January 12, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28079223/ultrafast-energy-and-electron-transfers-in-structurally-well-addressable-bodipy-porphyrin-fullerene-polyads
#11
Di Gao, Shawkat M Aly, Paul-Ludovic Karsenti, Gessie Brisard, Pierre D Harvey
Two electron transfer polyads built upon [C60]-[ZnP]-[BODIPY] (1) and [ZnP]-[ZnP](-[BODIPY])(-[C60]) (2), where [C60] = N-methyl-2-phenyl-3,4-fulleropyrrolidine, [BODIPY] = boron dipyrromethane, and [ZnP] = zinc(ii) porphyrin, were synthesized along with their corresponding energy transfer polyads [ZnP]-[BODIPY] (1a) and [ZnP]-[ZnP]-[BODIPY] (2a) as well as relevant models. These polyads were studied using cyclic voltammetry, DFT computations, steady state and time-resolved fluorescence spectroscopy, and fs transient absorption spectroscopy...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28078077/a-novel-method-for-the-quantification-of-fatty-infiltration-in-skeletal-muscle
#12
Nicole K Biltz, Gretchen A Meyer
BACKGROUND: Fatty infiltration of the skeletal muscle is a common but poorly understood feature of many myopathies. It is best described in human muscle, where non-invasive imaging techniques and representative histology have been optimized to view and quantify infiltrating fat. However, human studies are limited in their ability to identify cellular and molecular mechanisms regulating fatty infiltration, a likely prerequisite to developing targeted interventions. As mechanistic investigations move to small animals, studies may benefit from new or adapted imaging tools optimized for high resolution and whole muscle quantification...
2017: Skeletal Muscle
https://www.readbyqxmd.com/read/28077701/a-comparison-of-eleven-phenotypic-assays-for-the-accurate-detection-of-carbapenemase-producing-enterobacteriaceae
#13
Pranita D Tamma, Belita N A Opene, Andrew Gluck, Krizia K Chambers, Karen C Carroll, Patricia J Simner
BACKGROUND: Early identification of carbapenemase-producing Enterobacteriaceae (CPE) is essential to prevent their dissemination within healthcare settings. Our objective was to evaluate the accuracy of 11 phenotypic assays for the detection of CPE. METHODS: Two collections of carbapenem-resistant Enterobacteriaceae (CRE) isolates were evaluated including 191 retrospective isolates (122 CP-CRE and 69 non-CP isolates) as well as 45 prospective clinical isolates (15 CP-CRE and 30 non-CP-CRE) obtained over a 3-month period...
January 11, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28075600/a-synthesis-of-dual-warhead-%C3%AE-aryl-ethenesulfonyl-fluorides-and-one-pot-reaction-to-%C3%AE-sultams
#14
Praveen K Chinthakindi, Kimberleigh B Govender, A Sanjeeva Kumar, Hendrik G Kruger, Thavendran Govender, Tricia Naicker, Per I Arvidsson
Herein, we report an operationally simple, ligand- and additive-free oxidative boron-Heck coupling that is compatible with the ethenesulfonyl fluoride functional group. The protocol proceeds at room temperature with chemoselectivity and E-isomer selectivity and offers facile access to a wide range of β-aryl/heteroaryl ethenesulfonyl fluorides from commercial boronic acids. Furthermore, we demonstrate a "one-pot click" reaction to directly transform the products to aryl-substituted β-sultams.
January 11, 2017: Organic Letters
https://www.readbyqxmd.com/read/28074854/facile-synthesis-of-highly-crystalline-and-large-areal-hexagonal-boron-nitride-from-borazine-oligomers
#15
Sungchan Park, Tae Hoon Seo, Hyunjin Cho, Kyung Hyun Min, Dong Su Lee, Dong-Il Won, Sang Ook Kang, Myung Jong Kim
A novel and facile synthetic method for h-BN films from borazine oligomer (B3N3H4)x precursors has been developed. This method only includes spin-coating of borazine oligomer onto nickel catalysts and a subsequent annealing step. Large areal and highly crystalline h-BN films were obtained. The stoichiometric B/N ratio of borazine oligomer precursor was preserved in the final h-BN product such that it was close to 1 as revealed by XPS. Catalytic effect of nickel for h-BN formation was clearly demonstrated by lowering crystallization temperature compared to the growth condition in the absence of catalyst...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28074601/boraformylation-and-silaformylation-of-allenes
#16
Tetsuaki Fujihara, Ayumi Sawada, Tatsuya Yamaguchi, Yosuke Tani, Jun Terao, Yasushi Tsuji
The boraformylation of allenes with B2 (pin)2 and a formate ester as boron and formyl source, respectively, proceeds in the presence of a copper catalyst. The reaction selectively affords the corresponding β-boryl β,γ-unsaturated aldehydes in good to high yields. Furthermore, the silaformylation of allenes was achieved with a formate ester and PhMe2 Si-B(pin) as the silicon source.
January 11, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28073372/a-novel-method-for-the-quantification-of-fatty-infiltration-in-skeletal-muscle
#17
Nicole K Biltz, Gretchen A Meyer
BACKGROUND: Fatty infiltration of the skeletal muscle is a common but poorly understood feature of many myopathies. It is best described in human muscle, where non-invasive imaging techniques and representative histology have been optimized to view and quantify infiltrating fat. However, human studies are limited in their ability to identify cellular and molecular mechanisms regulating fatty infiltration, a likely prerequisite to developing targeted interventions. As mechanistic investigations move to small animals, studies may benefit from new or adapted imaging tools optimized for high resolution and whole muscle quantification...
January 10, 2017: Skeletal Muscle
https://www.readbyqxmd.com/read/28073274/quantum-dots-embedded-in-graphene-nanoribbons-by-chemical-substitution
#18
Eduard Carbonell-Sanromà, Pedro Brandimarte, Richard Balog, Martina Corso, Shigeki Kawai, Aran Garcia-Lekue, Shohei Saito, Shigehiro Yamaguchi, Ernst Meyer, Daniel Sánchez-Portal, Jose Ignacio Pascual
Bottom-up chemical reactions of selected molecular precursors on a gold surface can produce high quality graphene nanoribbons (GNRs). Here, we report on the formation of quantum dots embedded in an armchair GNR by substitutional inclusion of pairs of boron atoms into the GNR backbone. The boron inclusion is achieved through the addition of a small amount of boron substituted precursors during the formation of pristine GNRs. In the pristine region between two boron pairs, the nanoribbons show a discretization of their valence band into confined modes compatible with a Fabry-Perot resonator...
January 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28071886/boronlectin-polyelectrolyte-ensembles-as-artificial-tongue-design-construction-and-application-for-discriminative-sensing-of-complex-glycoconjugates-from-panax-ginseng
#19
Xiao-Tai Zhang, Shu Wang, Guo-Wen Xing
Ginsenoside is a large family of triterpenoid saponins from panax ginseng, which possesses various important biological functions. Due to the very similar structures of these complex glycoconjugates, it is crucial to develop powerful analytic method to identify ginsenosides qualitatively or quantitatively. We herein report an eight-channel fluorescent sensor array as artificial tongue to achieve the discriminative sensing of ginsenosides. The fluorescent cross-responsive array was constructed by four boronlectins bearing flexible boronic acid moieties (FBAs) with multiple reactive sites and two linear poly(phenylene-ethynylene) (PPEs)...
January 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28071849/activation-of-the-b-f-bond-by-diphenylcarbene-a-reversible-1-2-fluorine-migration-between-boron-and-carbon
#20
Paolo Costa, Joel Mieres Perez, Nesli Özkan, Wolfram Sander
Experiments in low-temperature matrices reveal that triplet diphenylcarbene inserts into the very strong B-F bond of BF3 in a two-step reaction. The first step is the formation of a strongly bound Lewis acid-base complex between the singlet state of diphenylcarbene and BF3 . This step involves an inversion of the spin state of the carbene from triplet to singlet. The second step requires visible-light photochemical activation to induce a 1,2-F migration from boron to the adjacent carbon atom under formation of the formal insertion product of the carbene center into BF3 ...
January 10, 2017: Angewandte Chemie
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