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https://www.readbyqxmd.com/read/28931284/one-step-synthesis-of-fluorescent-boron-nitride-quantum-dots-via-a-hydrothermal-strategy-using-melamine-as-nitrogen-source-for-the-detection-of-ferric-ions
#1
Bingbing Huo, Bingping Liu, Tao Chen, Liang Cui, Gengfang Xu, Mengli Liu, Jingquan Liu
A facile and effective approach for the preparation of functionalized born nitride quantum dots (BNQDs) with blue fluorescence was explored by the hydrothermal treatment of the mixture of boric acid and melamine at 200 oC for 15 h. The as-prepared BNQDs were characterized by transmission electron microscopy (TEM), high-resolution TEM (HRTEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), UV-vis spectroscopy and fluorescence spectroscopy. The single layered BNQDs with the average size of 3 nm showed a blue light emission under the illumination of the UV light...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28922386/new-carboxamide-derivatives-bearing-benzenesulphonamide-as-a-selective-cox-ii-inhibitor-design-synthesis-and-structure-activity-relationship
#2
David Izuchukwu Ugwu, Uchechukwu Chris Okoro, Hilal Ahmad
Sixteen new carboxamide derivatives bearing substituted benzenesulphonamide moiety (7a-p) were synthesized by boric acid mediated amidation of appropriate benzenesulphonamide with 2-amino-4-picoline and tested for anti-inflammatory activity. One compound 7c showed more potent anti-inflammatory activity than celecoxib at 3 h in carrageenan-induced rat paw edema bioassay. Compounds 7g and 7k also showed good anti-inflammatory activity comparable to celecoxib. Compound 7c appeared selectivity index (COX-2/COX-1) better than celecoxib...
2017: PloS One
https://www.readbyqxmd.com/read/28914050/boric-acid-as-an-efficient-agent-for-the-control-of-polydopamine-self-assembly-and-surface-properties
#3
Anne Schneider, Joseph Hemmerlé, Manon Allais, Jeoffrey Didierjean, Marc Michel, Marco d'Ischia, Vincent Ball
The deposition of polydopamine (PDA) films on surfaces, a versatile deposition method with respect to the nature of the used substrate, is unfortunately accompanied by deposition of insoluble precipitates in solution after a prolonged oxidation time of dopamine solutions. Therefore, there is evident interest to find methods able to stop the deposition of PDA on surfaces and to simultaneously control the self-assembly of PDA in solution to get stable colloidal aggregates. In addition to proposed methods relying on the use of polymers like poly(vinyl alcohol) and proteins like human serum albumin, we show herein that boric acid is an efficient adjuvant that is simultaneously able to stop the self-assembly of PDA in solution as well as on surfaces and to change the adhesive properties of the resulting PDA coatings...
September 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28898587/the-antioxidant-and-antiapoptotic-effect-of-boric-acid-on-hepatoxicity-in-chronic-alcohol-fed-rats
#4
Ibrahim Sogut, Sıla Ozlem Paltun, Matem Tuncdemir, Melike Ersoz, Canan Hurdag
The harmful use alcohol is a worldwide problem involving all ages. This study aims to investigate chronic alcohol exposure related hepatotoxicity on the rats liver and possible hepatoprotective effects of boric acid. Rats were separated into four different group: control, ethanol, ethanol+boric acid and boric acid. We measured malondialdehyde levels (MDA), total sialic acid (TSA), superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) levels which are known to be the markers of alcohol damage and also caspase-3, tumor necrosis factor-alpha (TNF-α) and the terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) as the markers of apoptosis were measured...
September 12, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28887177/a-step-into-the-rna-world-conditional-analysis-of-hydrogel-formation-of-adenosine-5-monophosphate-induced-by-cyanuric-acid
#5
Takumi Yokosawa, Ryota Enomoto, Sho Uchino, Ito Hirasawa, Takuya Umehara, Koji Tamura
Nucleotide polymerization occurs by the nucleophilic attack of 3'-oxygen of the 3'-terminal nucleotide on the α-phosphorus of the incoming nucleotide 5'-triphosphate. The π-stacking of mononucleotides is an important factor for prebiotic RNA polymerization in terms of attaining the proximity of two reacting moieties. Adenosine and adenosine 5'-monophosphate (AMP) are known to form hydrogel in the presence of cyanuric acid at neutral pH. However, we observed that other canonical ribonucleotides did not gel under the same condition...
September 5, 2017: Bio Systems
https://www.readbyqxmd.com/read/28871157/gdp-d-mannose-epimerase-regulates-male-gametophyte-development-plant-growth-and-leaf-senescence-in-arabidopsis
#6
Tiancong Qi, Zhipeng Liu, Meng Fan, Yan Chen, Haixia Tian, Dewei Wu, Hua Gao, Chunmei Ren, Susheng Song, Daoxin Xie
Plant GDP-D-mannose epimerase (GME) converts GDP-D-mannose to GDP-L-galactose, a precursor of both L-ascorbate (vitamin C) and cell wall polysaccharides. However, the genetic functions of GME in Arabidopsis are unclear. In this study, we found that mutations in Arabidopsis GME affect pollen germination, pollen tube elongation, and transmission and development of the male gametophyte through analysis of the heterozygous GME/gme plants and the homozygous gme plants. Arabidopsis gme mutants also exhibit severe growth defects and early leaf senescence...
September 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28827619/self-sacrificed-template-synthesis-of-ribbon-like-hexagonal-boron-nitride-nano-architectures-and-their-improvement-on-mechanical-and-thermal-properties-of-pha-polymer
#7
Yan Zhao, Zhenya Liu, Chaochao Cao, Chong Wang, Yi Fang, Yang Huang, Chao Yu, Jun Zhang, Lanlan Li, Long Hu, Chengchun Tang
Two-dimensional (2-D) boron nitride (BN) nanomaterials have received intensive attention because of their attractive mechanical, thermal and chemical stability. Here we demonstrate, for the first time, the synthesis of ribbon-like hexagonal boron nitride nano-architectures (RLBN) through a simple self-sacrificed template method using the cheap boric acid and melamine as raw materials. After the freeze-drying and thermal decomposition process, uniform ultrathin RLBN with width of 200-500 nm and thick of a few nanometers can be obtained...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28820487/copper-catalyzed-synthesis-of-unsymmetrical-diorganyl-chalcogenides-te-se-s-from-boronic-acids-under-solvent-free-conditions
#8
Sumbal Saba, Giancarlo Vaccari Botteselle, Marcelo Godoi, Tiago Elias Allievi Frizon, Fábio Zazyki Galetto, Jamal Rafique, Antonio L Braga
The efficient and mild copper-catalyzed synthesis of unsymmetrical diorganyl chalcogenides under ligand- and solvent-free conditions is described. The cross-coupling reaction was performed using aryl boric acids and 0.5 equiv. of diorganyl dichalcogenides (Te/Se/S) in the presence of 3 mol % of CuI and 3 equiv. of DMSO, under microwave irradiation. This new protocol allowed the preparation of several unsymmetrical diorganyl chalcogenides in good to excellent yields.
August 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28819159/identification-of-boric-acid-as-a-novel-chemoattractant-and-elucidation-of-its-chemoreceptor-in-ralstonia-pseudosolanacearum-ps29
#9
Akiko Hida, Shota Oku, Yutaka Nakashimada, Takahisa Tajima, Junichi Kato
Chemotaxis enables bacteria to move toward more favorable environmental conditions. We observed chemotaxis toward boric acid by Ralstonia pseudosolanacearum Ps29. At higher concentrations, the chemotactic response of R. pseudosolanacearum toward boric acid was comparable to or higher than that toward L-malate, indicating that boric acid is a strong attractant for R. pseudosolanacearum. Chemotaxis assays under different pH conditions suggested that R. pseudosolanacearum recognizes B(OH)3 (or B(OH3) + B(OH)4(-)) but not B(OH)4(-) alone...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28792431/a-new-approach-to-synthesize-of-4-phenacylideneflavene-derivatives-and-to-evaluate-their-cytotoxic-effects-on-hepg2-cell-line
#10
Hongbin Chen, Yang Xu, Yinan Zhang, Zongping Zheng
In this study, a convenient approach and green procedure for the synthesis of 4-phenacylideneflavenes has been developed from the reaction between 2,4-dihydroxybenzaldehyde and substituted acetophenones using boric acid as a catalyst in polyethylene glycol 400. Seven 4-phenacylideneflavenes were synthetized and their structures were confirmed by NMR and mass spectral analyses. Meanwhile, their possible mechanism of formation was also discussed. These products were found to have potential cytotoxic effect on HepG2 cell line with IC50 values from 12...
August 9, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28753996/boron-tolerance-in-aspergillus-nidulans-is-sustained-by-the-slta-pathway-through-the-slc-family-transporters-sbta-and-sbtb
#11
María Villarino, Oier Etxebeste, Gorka Mendizabal, Aitor Garzia, Unai Ugalde, Eduardo A Espeso
Microbial cells interact with the environment by adapting to external changes. Signal transduction pathways participate in both sensing and responding in the form of modification of gene expression patterns, enabling cell survival. The filamentous fungal-specific SltA pathway regulates tolerance to alkalinity, elevated cation concentrations and, as shown in this work, also stress conditions induced by borates. Growth of sltA(-) mutants is inhibited by increasing millimolar concentrations of boric acid or borax (sodium tetraborate)...
July 21, 2017: Genes
https://www.readbyqxmd.com/read/28735711/stereoselective-separation-of-%C3%AE-adrenergic-blocking-agents-containing-two-chiral-centers-by-countercurrent-chromatography
#12
Liqiong Lv, Zhisi Bu, Mengxia Lu, Xiaoping Wang, Jizhong Yan, Shengqiang Tong
Four β-adrenergic blocking agents, including 1-[(1-methylethyl)amino]-3-phenoxy-2-propanol (1), 1-[(1-methylethyl)amino]-3-(3-methylphenoxy)-2-propanol (2), 1,1'-[1,4-phenylenebis(oxy)]bis[3-[(1-methylethyl)amino]-2-propanol (3) and 1,1'-[(4-methyl-1,2-phenylene)bis(oxy)]bis[3-[(1-methylethyl)amino]-2-propanol (4), were stereoselectively separated by countercurrent chromatography using di-n-hexyl l-tartrate and boric acid as chiral selector. The compounds (3) and (4) have four optical isomers since they contained two chiral centers...
July 14, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28732584/boric-acid-probably-increases-clinical-attachment-level-and-reduces-probing-depth-and-intrabony-defect-depth-when-used-as-an-adjunct-to-scaling-and-root-planing-in-patients-with-chronic-periodontitis
#13
Romina Brignardello-Petersen
No abstract text is available yet for this article.
July 17, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28732263/proteomic-analysis-of-naturally-occurring-boron-tolerant-plant-gypsophila-sphaerocephala-l-in-response-to-high-boron-concentration
#14
Huseyin Tombuloglu, Guzin Tombuloglu, Mehmet Serdal Sakcali, Ali Turkan, Khalid Rehman Hakeem, Hesham F Alharby, Shah Fahd, Waseem Mohammed Abdul
Gypsophila sphaerocephala is a naturally Boron (B) tolerant species that can grow around the B mining areas in Turkey, where the B concentration in soil reaches a lethal dose for plants (up to ∼8900mgkg(-1) (∼140mM). While its interesting survival capacity in extremely B containing soils, any molecular research has been conducted to understand its high tolerance mechanism yet. In the present study, we have performed a proteomic analysis of this plant to understand its high tolerance towards B-stress. Seedlings of G...
September 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28730576/effects-of-boron-supplementation-on-expression-of-hsp70-in-the-spleen-of-african-ostrich
#15
Khaliq Haseeb, Jing Wang, Ke Xiao, Ke-Li Yang, Peng-Peng Sun, Xing-Tong Wu, You Luo, Hui Song, Hua-Zhen Liu, Ju-Ming Zhong, Ke-Mei Peng
Increased synthesis of heat shock protein 70 (Hsp70) occurs in prokaryotes and eukaryotes in response to physiological, environmental, and chemical exposures, thus allowing the cell survival from fatal conditions. Hsp70 cytoprotective properties may be clarified by its anti-apoptotic function. Boron has been reported to play an essential role in various organ developments and metabolisms. However, it is not known if boron is also able to modulate the Hsp70. In the present study, the actions of boron on ostrich spleen and expression level of Hsp70 were investigated...
July 20, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28719814/enantiomeric-separation-of-seven-%C3%AE-agonists-by-nace-study-of-chiral-selectivity-with-diacetone-d-mannitol-boric-acid-complex
#16
Lili Lv, Lijuan Wang, Jun Li, Yajun Jiao, Shengnan Gao, Jiachang Wang, Hongyuan Yan
A rapid and effective nonaqueous capillary electrophoresis (NACE)-ultraviolet (UV) method was developed for the enantiomeric separation of seven β-agonists. Diacetone-d-mannitol-boric acid complex was used as a new chiral selector. It was in situ synthesized by the reaction of diacetone-d-mannitol and boric acid in methanol medium containing triethylamine. The effects of diacetone-d-mannitol, boric acid, and triethylamine concentrations on the enantioseparation were carefully investigated. Under the optimized conditions, baseline enantioseparation could be obtained for six of the tested β-agonists within 12min...
October 25, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28692333/boron-and-the-evolutionary-development-of-roots
#17
Ulrich Kutschera, Karl J Niklas
Experimental work has shown that Boron (i.e., Boric acid, B) is an essential and multifunctional microelement for vascular plant development. In addition to its other functions, which include xylem development and lignin biosynthesis, we now know that B is involved in phytohormone-signaling and influences the mechanical properties of intercellular pectins. From these data, we conclude that B played an important role during the evolutionary development of lignified tissues, and that it may have been involved in the evolution of vascular plant roots, as hypothesized by D...
July 3, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28681974/supramolecular-gel-electrophoresis-of-large-dna-fragments
#18
Shohei Tazawa, Kazuhiro Kobayashi, Takanori Oyoshi, Masamichi Yamanaka
Pulsed-field gel electrophoresis is a frequent technique used to separate exceptionally large DNA fragments. In a typical continuous field electrophoresis, it is challenging to separate DNA fragments larger than 20 kbp because they migrate at a comparable rate. To overcome this challenge, it is necessary to develop a novel matrix for the electrophoresis. Here, we de-scribe the electrophoresis of large DNA fragments up to 166 kbp using a supramolecular gel matrix and a typical continuous field electrophoresis system...
July 6, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28658656/solubility-products-of-sparingly-soluble-barium-perborates-in-aqueous-solution-that-contains-b-oh-3-and-h2o2-at-25%C3%A2-c
#19
Jui-Yen Lin, Yi-Jin Song, Yu-Jen Shih, Yao-Hui Huang
Chemical oxo-precipitation (COP) has become a promising method for treating boron wastewater at room temperature; it uses hydrogen peroxide to convert boric acid to perborate species, which are precipitated using alkaline earth metals. In this work, solubility models of barium perborates were established to predict residual boron levels from COP. The solubility product constants (pKsp) of two major barium perborates - amorphous Ba(B(OH)3OOH)2 (A-BaPB) and crystalline BaB(OH)2(OO)2B(OH)2 (C-BaPB) - were experimentally estimated (8...
November 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28637710/the-combined-action-of-duplicated-boron-transporters-is-required-for-maize-growth-in-boron-deficient-conditions
#20
Mithu Chatterjee, Qiujie Liu, Caitlin Menello, Mary Galli, Andrea Gallavotti
The micronutrient boron is essential in maintaining the structure of plant cell walls and is critical for high yields in crop species. Boron can move into plants by diffusion or by active and facilitated transport mechanisms. We recently showed that mutations in the maize boron efflux transporter ROTTEN EAR (RTE) cause severe developmental defects and sterility. RTE is part of a small gene family containing five additional members (RTE2-RTE6) that show tissue-specific expression. The close paralogous gene RTE2 encodes a protein with 95% amino acid identity with RTE and is similarly expressed in shoot and root cells surrounding the vasculature...
August 2017: Genetics
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