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https://www.readbyqxmd.com/read/28087364/aquaglyceroporins-are-the-entry-pathway-of-boric-acid-in-trypanosoma-brucei
#1
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/28077431/enantiomers-recognition-of-propranolol-based-on-organic-inorganic-hybrid-open-tubular-mips-cec-column-using-3-trimethoxysilyl-propyl-methacrylate-as-a-cross-linking-monomer
#2
Guo-Ning Chen, Ning Li, Tian Luo, Yu-Ming Dong
In this study, 3-(trimethoxysilyl)propyl methacrylate (γ-MPS), a bifunctional group compound, was used as a single cross-linking agent to prepare molecular imprinted inorganic-organic hybrid polymers by in situ polymerization for open-tubular capillary electro chromatography (CEC) column. The optimal preparation conditions were: the ratio between template molecule and functional monomer was 1:4; the volume proportion of porogen toluene and methanol was 1:1 and the volume of cross-linking agent γ-MPS was 69 μL...
January 10, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28054509/single-step-synthesis-of-crystalline-h-bn-quantum-and-nanodots-embedded-in-boron-carbon-nitride-films
#3
Boitumelo Matsoso, Kamalakannan Ranganathan, Bridget Mutuma, Tsenolo Lerotholi, Glenn Jones, Neil J Coville
Herein we report on the synthesis and characterization of novel crystalline hexagonal boron nitride (h-BN) quantum- and nanodots embedded in large-area boron carbon nitride (BCN) films. The films were grown on a Cu substrate by an atmospheric pressure chemical vapour deposition (APCVD) technique. Methane, ammonia, and boric acid were used as precursors for C, N and B to grow these few atomic layer thick uniform films. We observed that both the size of the h-BN quantum/nanodots and thickness of the BCN films were influenced by the vaporization temperature of boric acid as well as the B2O3 (g) flux over the Cu substrate...
January 5, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28042842/novel-2-3-dihydro-1h-pyrrolo-3-2-1-ij-quinazolin-1-ones-synthesis-and-biological-evaluation
#4
Malose J Mphahlele, Tebogo A Khoza, Peaceful Mabeta
Herein we describe the synthesis and evaluation of a series of novel 2,3-dihydro-1H-pyrrolo[3,2,1-ij]quinazolin-1-ones for in vitro cytotoxicity against three human cancer cell lines as well as for potential antimalarial activity against the chloroquine-sensitive strain 3D7 of Plasmodium falciparum. The title compounds were prepared via PdCl₂-mediated endo-dig cyclization of 2-aryl-8-(arylethynyl)-6-bromo-2,3-dihydroquinazolin-4(1H)-ones. The latter were prepared, in turn, via initial Sonogashira cross-coupling of 2-amino-5-bromo-3-iodobenzamide with aryl acetylenes followed by boric acid-mediated cyclocondensation of the intermediate 2-amino-3-(arylethynyl)-5-bromobenzamides with benzaldehyde derivatives...
December 30, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28040665/spectroscopic-quantification-of-5-hydroxymethylcytosine-in-genomic-dna-using-boric-acid-functionalized-nano-microsphere-fluorescent-probes
#5
Hua-Yan Chen, Jing-Ru Wei, Jiong-Xiu Pan, Wei Zhang, Fu-Quan Dang, Zhi-Qi Zhang, Jing Zhang
5-hydroxymethylcytosine (5hmC) is the sixth base of DNA. It is involved in active DNA demethylation and can be a marker of diseases such as cancer. In this study, we developed a simple and sensitive 2-(4-boronophenyl)quinoline-4-carboxylic acid modified poly (glycidyl methacrylate (PBAQA-PGMA) fluorescent probe to detect the 5hmC content of genomic DNA based on T4 β-glucosyltransferase-catalyzed glucosylation of 5hmC. The fluorescence-enhanced intensity recorded from the DNA sample was proportional to its 5-hydroxymethylcytosine content and could be quantified by fluorescence spectrophotometry...
December 16, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28031470/effectiveness-of-naturally-occurring-substances-added-to-duck-litter-in-reducing-emergence-and-landing-of-adult-musca-domestica-diptera-muscidae
#6
Simon Lachance, Justine Shiell, Michele T Guerin, Cynthia Scott-Dupree
Poultry barns provide an ideal breeding environment for Musca domestica L. (Diptera: Muscidae) owing to the controlled temperatures and litter (manure plus bedding material) accumulation. Management techniques that render the litter less suitable for immature stage development, such as the addition of naturally occurring insecticidal substances, could reduce fly infestations. The effectiveness of acetic, boric, and citric acids; diatomaceous earth; and hydrated lime at restricting female landing and growth of house flies in duck litter was evaluated...
December 28, 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28024393/boron-precursor-dependent-evolution-of-differently-emitting-carbon-dots
#7
Jayasmita Jana, Mainak Ganguly, Kuttay R S Chandrakumar, Gowravaram Mohan Rao, Tarasankar Pal
Attention has been directed toward electron-deficient boron doping in carbon dots (CDs) with the expectation of revealing new photophysical aspects in accordance with varying amounts of boron content. It has been emphatically shown that boron uptake in CDs varies with different boron precursors evolving altered emissive CDs. Boron doping in CDs causes definite surface defect due to the generation of electron-deficient states. Modified hydrothermal treatment of a mixture of ascorbic acid (AA) and different boron precursor compounds (borax/boric acid/sodium borate/sodium borohydride) produces different kinds of boron-doped CDs (BCDs)...
January 6, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28004084/a-novel-synthesis-of-zinc-borates-from-a-zinc-oxide-precursor-via-ultrasonic-irradiation
#8
Ali Can Ersan, Meral Yildirim, Azmi Seyhun Kipcak, Nurcan Tugrul
In this study, zinc borate hydrate (Zn3B6O12 · 3.5H2O) was synthesized from zinc oxide (ZnO) and boric acid (H3BO3) via a novel method of ultrasonic irradiation. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and Raman spectroscopy were used to characterize the synthesized products. Scanning electron microscopy (SEM) was used to determine the effects of reaction time and reaction temperature on the morphology of the products. Thermal dehydration kinetics were studied using thermal gravimetry and differential thermal gravimetry analysis (TG/DTA)...
December 2016: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/27987998/preparation-and-characterization-of-intelligent-starch-pva-films-for-simultaneous-colorimetric-indication-and-antimicrobial-activity-for-food-packaging-applications
#9
Bin Liu, Han Xu, Huiying Zhao, Wei Liu, Liyun Zhao, Yuan Li
We have developed an intelligent starch/poly-vinyl alcohol (PVA) film that is capable of monitoring pH changes and inhibiting undesired microbial growth in foods. Starch and PVA polymers in the film were doubly cross-linked by sodium trimetaphosphate and boric acid to improve their water-resistance and mechanical strength. Anthocyanins (ANT) and limonene (LIM) were used to achieve simultaneous colorimetric indication and antimicrobial activity. Firstly, the characterization of surface morphology using SEM confirmed that the starch-PVA-ANT-LIM film possessed a smooth surface...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27987659/optimization-of-crosslinked-poly-vinyl-alcohol-nanocomposite-films-for-mechanical-properties
#10
Milad Rouhi, Seyed Hadi Razavi, Seyed Mohammad Mousavi
The effects of glycerol, bacterial cellulose nanocrystal (BCNC) and boric acid concentrations on the mechanical properties of PVA based films, including ultimate tensile strength (UTS), elongation at break (EAB), tensile Young's modulus (TYM), tensile toughness to break (TT), ultimate puncture strength (UPS), puncture deformation (PD), puncture Young's modulus (PYM) and puncture toughness to break (PT), were scrutinized using a response surface methodology-central composite rotatable design (RSM-CCRD). Second-order polynomial models with high R(2) values ranging from 0...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27984554/trichomonas-vaginalis-treated-with-boric-acid-in-a-metronidazole-allergic-female
#11
Kandis Vechelle Backus, Christina A Muzny, Laura S Beauchamps
No abstract text is available yet for this article.
December 14, 2016: Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/27974728/enhancing-physical-properties-and-lifespan-of-bacterial-quorum-quenching-media-through-combination-of-ionic-cross-linking-and-dehydration
#12
Sang Hyun Lee, Seonki Lee, Kibaek Lee, Chang Hyun Nahm, Sung-Jun Jo, Jaewoo Lee, Kwang-Ho Choo, Jung-Kee Lee, Chung-Hak Lee, Pyung-Kyu Park
Quorum quenching (QQ) bacteria entrapped in a polymeric composite hydrogel (QQ medium) has been successfully applied in MBRs for an effective biofouling control. However, in order to bring QQ technology closer to practice, physical strength and life time of QQ media should be improved. In this study, enforcement of physical strength, as well as an extension of the lifetime of a previously reported QQ bacteria entrapping hollow cylinder (QQ-HC), was sought by adding a dehydration procedure following the cross-linking of the polymeric hydrogel by inorganic compounds like Ca²⁺ and boric acid...
December 14, 2016: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27934922/extreme-activity-of-drug-nanocrystals-coated-with-a-layer-of-non-covalent-polymers-from-self-assembled-boric-acid
#13
Honglei Zhan, Jun F Liang
Non-covalent polymers have remarkable advantages over synthetic polymers for wide biomedical applications. In this study, non-covalent polymers from self-assembled boric acid were used as the capping reagent to replace synthetic polymers in drug crystallization. Under acidic pH, boric acid self-assembled on the surface of drug nanocrystals to form polymers with network-like structures held together by hydrogen bonds. Coating driven by boric acid self-assembly had negligible effects on drug crystallinity and structure but resulted in drug nanocrystals with excellent dispersion properties that aided in the formation of a more stable suspension...
December 9, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27918048/nitrogen-doped-graphene-oxide-for-effectively-removing-boron-ions-from-seawater
#14
Fuming Chen, Lu Guo, Xiaoming Zhang, Zhi Yi Leong, Shengyuan Yang, Hui Ying Yang
Elemental boron exists in the form of boric acid or borate salts in aqueous solution. The human body is very sensitive to the amount of boron, and boron contamination in drinking water affects our health adversely. However, boron is not easily removed due to its small ionic size and is a problem to water treatment systems. Herein, we report a new method to remove boron using nitrogen-doped graphene oxide (N-GO). The maximum adsorption capacity we have obtained is 58.7 mg g(-1) and this makes N-GO one of the best materials to adsorb boron...
January 7, 2017: Nanoscale
https://www.readbyqxmd.com/read/27904499/boric-acid-reduces-axonal-and-myelin-damage-in-experimental-sciatic-nerve-injury
#15
Zahir Kızılay, Haydar Ali Erken, Nesibe Kahraman Çetin, Serdar Aktaş, Burçin İrem Abas, Ali Yılmaz
The aim of this study was to investigate the effects of boric acid in experimental acute sciatic nerve injury. Twenty-eight adult male rats were randomly divided into four equal groups (n = 7): control (C), boric acid (BA), sciatic nerve injury (I), and sciatic nerve injury + boric acid treatment (BAI). Sciatic nerve injury was generated using a Yasargil aneurysm clip in the groups I and BAI. Boric acid was given four times at 100 mg/kg to rats in the groups BA and BAI after injury (by gavage at 0, 24, 48 and 72 hours) but no injury was made in the group BA...
October 2016: Neural Regeneration Research
https://www.readbyqxmd.com/read/27896863/one-step-synthesis-of-boron-nitride-quantum-dots-simple-chemistry-meets-delicate-nanotechnology
#16
Bingping Liu, Shihai Yan, Zhongqian Song, Mengli Liu, Xuqiang Ji, Wenrong Yang, Jingquan Liu
Herein, a conceptually new and straightforward aqueous route is described for the synthesis of hydroxyl- and amino-functionalized boron nitride quantum dots (BNQDs) with quantum yields (QY) as high as 18.3 % by using a facile bottom-up approach, in which a mixture of boric acid and ammonia solution was hydrothermally treated in one pot at 200 °C for 12 h. The functionalized BNQDs, with excellent photoluminescence properties, could be easily dispersed in an aqueous medium and applied as fluorescent probes for the detection of ferrous (Fe(2+) ) and ferric (Fe(3+) ) ions with excellent selectivity and low detection limits...
December 23, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27875555/doping-polypyrrole-films-with-4-n-pentylphenylboronic-acid-to-enhance-affinity-towards-bacteria-and-dopamine
#17
Mohsen Golabi, Laurence Padiolleau, Xi Chen, Mohammad Javad Jafari, Elham Sheikhzadeh, Anthony P F Turner, Edwin W H Jager, Valerio Beni
Here we demonstrate the use of a functional dopant as a fast and simple way to tune the chemical affinity and selectivity of polypyrrole films. More specifically, a boronic-functionalised dopant, 4-N-Pentylphenylboronic Acid (PBA), was used to provide to polypyrrole films with enhanced affinity towards diols. In order to prove the proposed concept, two model systems were explored: (i) the capture and the electrochemical detection of dopamine and (ii) the adhesion of bacteria onto surfaces. The chemisensor, based on overoxidised polypyrrole boronic doped film, was shown to have the ability to capture and retain dopamine, thus improving its detection; furthermore the chemisensor showed better sensitivity in comparison with overoxidised perchlorate doped films...
2016: PloS One
https://www.readbyqxmd.com/read/27854308/characterization-of-chemically-induced-bacterial-ghosts-bgs-using-sodium-hydroxide-induced-vibrio-parahaemolyticus-ghosts-vpgs
#18
Hyun Jung Park, Sung Oh, Nagarajan Vinod, Seongmi Ji, Han Byul Noh, Jung Mo Koo, Su Hyeong Lee, Sei Chang Kim, Ki-Sung Lee, Chang Won Choi
Acellular bacterial ghosts (BGs) are empty non-living bacterial cell envelopes, commonly generated by controlled expression of the cloned lysis gene E of bacteriophage PhiX174. In this study, Vibrio parahaemolyticus ghosts (VPGs) were generated by chemically-induced lysis and the method is based on minimum inhibitory concentration (MIC) of sodium hydroxide (NaOH), acetic acid, boric acid, citric acid, maleic acid, hydrochloric acid, and sulfuric acid. The MIC values of the respective chemicals were 3.125, 6...
November 15, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27818669/soybean-tip-gene-family-analysis-and-characterization-of-gmtip1-5-and-gmtip2-5-water-transport-activity
#19
Li Song, Na Nguyen, Rupesh K Deshmukh, Gunvant B Patil, Silvas J Prince, Babu Valliyodan, Raymond Mutava, Sharon M Pike, Walter Gassmann, Henry T Nguyen
Soybean, one of the most important crops worldwide, is severely affected by abiotic stress. Drought and flooding are the major abiotic stresses impacting soybean yield. In this regard, understanding water uptake by plants, its utilization and transport has great importance. In plants, water transport is mainly governed by channel forming aquaporin proteins (AQPs). Tonoplast intrinsic proteins (TIPs) belong to the plant-specific AQP subfamily and are known to have a role in abiotic stress tolerance. In this study, 23 soybean TIP genes were identified based on the latest soybean genome annotation...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27789032/improving-biopharmaceutical-properties-of-vinpocetine-through-cocrystallization
#20
Samuel Golob, Miranda Perry, Matteo Lusi, Michele R Chierotti, Iztok Grabnar, Lucia Lassiani, Dario Voinovich, Michael J Zaworotko
Vinpocetine is a poorly water soluble weakly basic drug (pKa = 7.1) used for the treatment of several cerebrovascular and cognitive disorders. Because existing formulations exhibit poor bioavailability and scarce absorption, a dosage form with improved pharmacokinetic properties is highly desirable. Cocrystallization represents a promising approach to generate diverse novel crystal forms and to improve the aqueous solubility and in turn the oral bioavailability. In this article, a novel ionic cocrystal of vinpocetine is described, using boric acid as a coformer, and fully characterized (by means of differential scanning calorimetry, solid-state nuclear magnetic resonance, powder and single-crystal X-ray diffraction, and powder dissolution test)...
October 24, 2016: Journal of Pharmaceutical Sciences
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