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https://www.readbyqxmd.com/read/27911496/gram-scale-chemical-synthesis-of-base-modified-ribonucleoside-5-o-triphosphates
#1
Muthian Shanmugasundaram, Annamalai Senthilvelan, Anilkumar R Kore
This unit delineates a simple, reliable, straight-forward, general, and efficient chemical method for the synthesis of modified nucleoside-5'-O-triphosphates such as 5-methylcytidine-5'-O-triphosphate (5-Me-CTP), pseudouridine-5'-O-triphosphate (pseudo-UTP), and N(1) -methylpseudouridine-5'-O-triphosphate (N(1) -methylpseudo-UTP), starting from the corresponding nucleoside. The reaction utilizes an improved protection-free "one-pot, three-step" Ludwig synthetic strategy that involves the monophosphorylation of the nucleoside with phosphorous oxychloride followed by reaction with tributylammonium pyrophosphate and subsequent hydrolysis of the resulting cyclic intermediate to furnish the corresponding ribonucleoside triphosphate (NTP) in moderate yields...
December 1, 2016: Current Protocols in Nucleic Acid Chemistry
https://www.readbyqxmd.com/read/27911481/photoluminescence-and-thermoluminescence-of-k2-mg-so4-2-eu-and-evaluation-of-its-kinetic-parameters
#2
Archana Deshpande, N S Dhoble, S C Gedam, S J Dhoble
The K2 Mg(SO4 )2 :Eu phosphor, synthesized by a solid-state diffusion method, was studied for its photoluminescence (PL) and thermoluminescence (TL) characteristics. The X-ray diffraction (XRD) pattern of the material was matched with the standard JCPDF No. 36-1499. For PL characteristics, K2 Mg(SO4 )2 :Eu(2)(+) showed an emission peak at 474 nm when excited at 340 nm, while it showed Eu(3)(+) emission at 580 nm, and 594 nm splitting at 613 nm and 618 nm for an excitation of 396 nm wavelength due to radiative transitions from (5) D0 to (7) Fj (j = 0, 1, 2, 3)...
December 2, 2016: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/27911415/extraction-of-plant-based-capsules-for-microencapsulation-applications
#3
Michael G Potroz, Raghavendra C Mundargi, Jae Hyeon Park, Ee-Lin Tan, Nam-Joon Cho
Microcapsules derived from plant-based spores or pollen provide a robust platform for a diverse range of microencapsulation applications. Sporopollenin exine capsules (SECs) are obtained when spores or pollen are processed so as to remove the internal sporoplasmic contents. The resulting hollow microcapsules exhibit a high degree of micromeritic uniformity and retain intricate microstructural features related to the particular plant species. Herein, we demonstrate a streamlined process for the production of SECs from Lycopodium clavatum spores and for the loading of hydrophilic compounds into these SECs...
November 9, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27911365/low-energy-cathodoluminescence-for-oxy-nitride-phosphors
#4
Yujin Cho, Benjamin Dierre, Takashi Sekiguchi, Takayuki Suehiro, Kohsei Takahashi, Takashi Takeda, Rong-Jun Xie, Yoshinobu Yamamoto, Naoto Hirosaki
Nitride and oxynitride (Sialon) phosphors are good candidates for the ultraviolet and visible emission applications. High performance, good stability and flexibility of their emission properties can be achieved by controlling their composition and dopants. However, a lot of work is still required to improve their properties and to reduce the production cost. A possible approach is to correlate the luminescence properties of the Sialon particles with their local structural and chemical environment in order to optimize their growth parameters and find novel phosphors...
November 15, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910921/bipolar-and-unipolar-silylene-diphenylene-%C3%AF-%C3%AF-conjugated-polymer-route-for-highly-efficient-electrophosphorescence
#5
Yao-Tang Chang, Sunil Sharma, Miao-Ken Hung, Yu-Hsuan Lee, Show-An Chen
σ-π conjugated polymer strategy is proposed for designing electroluminescent host polymers with silylene-diphenylene as the backbone repeat unit giving a high triplet energy (ET = 2.67 eV). By incorporation of high ET (3.0 eV) electron (oxadiazole, OXD) and hole (triphenyl amine, TPA) transport moieties, or TPA alone (in this case, the main chain acts as electron transport channel) as side arms on the silylene, the high ET bipolar and unipolar polymers are formed, allowing a use of iridium green phosphor (Ir(ppy)2(acac), Ir-G) (ET = 2...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910424/a-study-of-cr-39-plastic-charged-particle-detector-replacement-by-consumer-imaging-sensors
#6
K O Plaud-Ramos, M S Freeman, W Wei, E Guardincerri, J D Bacon, J Cowan, J M Durham, D Huang, J Gao, M A Hoffbauer, D J Morley, C L Morris, D C Poulson, Zhehui Wang
Consumer imaging sensors (CIS) are examined for real-time charged-particle detection and CR-39 plastic detector replacement. Removing cover glass from CIS is hard if not impossible, in particular for the latest inexpensive webcam models. We show that $10-class CIS are sensitive to MeV and higher energy protons and α-particles by using a (90)Sr β-source with its cover glass in place. Indirect, real-time, high-resolution detection is also feasible when combining CIS with a ZnS:Ag phosphor screen and optics...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27907133/phosphorous-nutritional-level-carbohydrate-reserves-and-flower-quality-in-olives
#7
Ran Erel, Uri Yermiyahu, Hagai Yasuor, Dan Cohen Chamus, Amnon Schwartz, Alon Ben-Gal, Arnon Dag
The olive tree is generally characterized by relatively low final fruit set consequential to a significant rate of undeveloped pistils, pistil abortion, and flower and fruitlet abscission. These processes are acknowledged to be governed by competition for resources between the developing vegetative and reproductive organs. To study the role of phosphorus (P) nutritional level on reproductive development, trees were grown under four levels of P for three years in large containers. Phosphorus nutritional level was positively related to rate of reproductive bud break, inflorescence weight, rate of hermaphrodite flowers, pistil weight, fruitlet persistence, fruit set and the consequential total number of fruits...
2016: PloS One
https://www.readbyqxmd.com/read/27907125/identification-of-a-highly-conserved-hypothetical-protein-ton_0340-as-a-probable-manganese-dependent-phosphatase
#8
Young-Sik Sohn, Seong-Gyu Lee, Kwang-Hoon Lee, Bonsu Ku, Ho-Chul Shin, Sun-Shin Cha, Yeon-Gil Kim, Hyun Sook Lee, Sung-Gyun Kang, Byung-Ha Oh
A hypothetical protein TON_0340 of a Thermococcus species is a protein conserved in a variety of organisms including human. Herein, we present four different crystal structures of TON_0340, leading to the identification of an active-site cavity harboring a metal-binding site composed of six invariant aspartate and glutamate residues that coordinate one to three metal ions. Biochemical and mutational analyses involving many phosphorous compounds show that TON_0340 is a Mn2+-dependent phosphatase. Mg2+ binds to TON_0340 less tightly and activates the phosphatase activity less efficiently than Mn2+...
2016: PloS One
https://www.readbyqxmd.com/read/27902871/multicolor-tuning-in-room-temperature-self-activated-ca2nb2o7-submicroplates-by-lanthanide-doping
#9
Jun-Cheng Zhang, Yan-Jie Liu, Xu Yan, Hong-Di Zhang, Jun Zhang, Xiao-Xiong Wang, Wen-Peng Han, Yun-Ze Long, Xin-Yuan Sun
Self-activated phosphors are capable of generating optical emissions from the internal ion groups of host lattice before externally introducing luminescent ions. However, numerous self-activated phosphors only show luminescence at low temperature due to the thermally-activated energy migration among ion groups at room temperature, severely confining their application conditions. In this letter, we propose a strategy to converting the low-temperature luminescence to a room-temperature one through changing the synthesis conditions to induce structural distortions and thus to limit energy migration...
November 30, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/27901155/syntheses-photoluminescence-and-electroluminescence-of-two-novel-platinum-ii-complexes
#10
Guang-Zhao Lu, Yan Li, Yi-Ming Jing, You-Xuan Zheng
Two new platinum(ii) cyclometalated complexes with 2-(4-trifluoromethyl)phenylpyridine (4-tfmppy) as the main ligand and tetraphenylimidodiphosphinate (tpip) (Pt-tpip) and tetra(4-fluorophenyl)imidodiphosphinate (ftpip) (Pt-ftpip) as ancillary ligands were developed. Both complexes were green phosphors with photoluminescence quantum efficiency yields of 71.5% and 79.2% in CH2Cl2 solution at room temperature, respectively. The organic light-emitting diodes with a double emissive layers structure of ITO/TAPC (1,1-bis(4-(di-p-tolylamino)phenyl)cyclohexane), 40 nm/Pt-tpip or Pt-ftpip: TcTa (4,4',4''-tri(9-carbazoyl)-triphenylamine) (5 wt%, 10 nm)/Pt-tpip or Pt-ftpip: 2,6DCzPPy (2,6-bis(3-(carbazol-9-yl)phenyl)pyridine) (5 wt%, 10 nm)/TmPyPB (1,3,5-tri(m-pyrid-3-yl-phenyl)benzene, 40 nm)/LiF (1 nm)/Al (100 nm) showed good performances...
November 30, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27898316/effects-of-iron-and-calcium-carbonate-on-the-variation-and-cycling-of-carbon-source-in-integrated-wastewater-treatments
#11
Zhao Zhimiao, Song Xinshan, Zhao Yufeng, Xiao Yanping, Wang Yuhui, Wang Junfeng, Yan Denghua
Iron and calcium carbonate were added in wastewater treatments as the adjusting agents to improve the contaminant removal performance and regulate the variation of carbon source in integrated treatments. At different temperatures, the addition of the adjusting agents obviously improved the nitrogen and phosphorous removals. TN and TP removals were respectively increased by 29.41% and 23.83% in AC-100 treatment under 1-day HRT. Carbon source from dead algae was supplied as green microbial carbon source and Fe(2+) was supplied as carbon source surrogate...
November 22, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27897998/a-new-two-photon-ratiometric-fluorescent-probe-for-detecting-alkaline-phosphatase-in-living-cells
#12
Xiaohong Zhou, Yuren Jiang, Xiongjie Zhao, Yao Zhu
Alkaline phosphatase (ALP) is an important diagnostic indicator of many human diseases. To quantitatively track ALP in biosystems, herein, for the first time, we report an efficient two-photon ratiometric fluorescent probe, termed probe 1 and based on classic naphthalene derivatives with a donor-π-acceptor (D-π-A) structure and deprotection of the phosphoric acid moiety by ALP. The presence of ALP causes the cleave of the phosphate group from naphthalene derivatives and the phosphate group changes the ability of the intramolecular charge transfer (ICT) and remarkably alters the probe's photophysical properties, thus an obvious ratiometric signal with an isoemissive point is observed...
November 25, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27894049/effect-of-co-doping-of-sodium-on-the-thermoluminescence-dosimetry-properties-of-copper-doped-zinc-lithium-borate-glass-system
#13
REVIEW
A Saidu, H Wagiran, M A Saeed, Y S M Alajerami, A B A Kadir
The effect of sodium as a co-dopant on the thermoluminescence (TL) properties of copper-doped zinc lithium borate (ZLB: Cu) subjected to Co-60 gamma radiation is reported in this study. TL intensity is enhanced with the introduction of sodium in ZLB: Cu. The obtained glow curve is simple with a single peak. The annealing procedure and the best heating rate for the proposed thermoluminescent dosimeter (TLD) are established, and the phosphor is reusable. The TL response within the dose range of 0.5-1000Gy is investigated...
October 11, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/27891323/reduced-cx3cl1-secretion-contributes-to-the-susceptibility-of-oral-leukoplakia-associated-fibroblasts-to-candida-albicans
#14
Ran Cheng, Duo Li, Xueke Shi, Qinghong Gao, Changlei Wei, Xiaoyu Li, Yan Li, Hongmei Zhou
Candida leukoplakia (OLK) is a kind of oral leukoplakia combined with chronic candidal infection, which plays an important role in the malignant transformation of OLK. However, little is known about the etiology, including susceptibility of leukoplakia to candidal adhesion, invasion and infection. Some antimicrobial peptides secreted by oral epithelial cells or fibroblasts potentially have antifungal activities against Candida albicans (C. albicans). In this study, we established three co-culture models to simulate different C...
2016: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/27890545/organic-acid-anions-an-effective-defensive-weapon-for-plants-against-aluminum-toxicity-and-phosphorus-deficiency-in-acidic-soils
#15
REVIEW
Zhi Chang Chen, Hong Liao
Aluminum (Al) toxicity and phosphorous (P) deficiency are two major limiting factors for plant growth on acidic soils. Thus, the physiological mechanisms for Al tolerance and P acquisition have been intensively studied. A commonly observed trait is that plants have developed the ability to utilize organic acid anions (OAs; mainly malate, citrate and oxalate) to combat Al toxicity and P deficiency. OAs secreted by roots into the rhizosphere can externally chelate Al(3+) and mobilize phosphate (Pi), while OAs synthesized in the cell can internally sequester Al(3+) into the vacuole and release free Pi for metabolism...
November 11, 2016: Journal of Genetics and Genomics, Yi Chuan Xue Bao
https://www.readbyqxmd.com/read/27889510/amine-functionalized-multi-arm-star-polymers-a-novel-platform-for-removing-glyphosate-from-aqueous-media
#16
Lianna Samuel, Ran Wang, Geraud Dubois, Robert Allen, Rudy Wojtecki, Young-Hye La
We describe a novel method for efficiently removing glyphosate from aqueous media via adsorption onto highly functionalized star-shaped polymeric particles. These particles have a polystyrene core with more than 35 attached methacrylate polymer arms, each containing a plurality of pendant amines (poly(dimethylamino ethyl methacrylate): PDMAEMA) that are partially protonated in water. Kinetic studies demonstrate that these star-polymers successfully remove up to 93% of glyphosate present in aqueous solution (feed concentration: 5 ppm), within 10 min contact time, outperforming activated carbon, which removed 33% after 20 min...
November 24, 2016: Chemosphere
https://www.readbyqxmd.com/read/27886586/nitrous-oxide-from-moving-bed-based-integrated-fixed-film-activated-sludge-membrane-bioreactors
#17
Giorgio Mannina, Marco Capodici, Alida Cosenza, Daniele Di Trapani, Vito Armando Laudicina, Hallvard Ødegaard
The present paper reports the results of a nitrous oxide (N2O) production investigation in a moving bed based integrated fixed film activated sludge (IFAS) membrane bioreactor (MBR) pilot plant designed in accordance with the University of Cape Town layout for biological phosphorous removal. Gaseous and liquid samples were collected in order to measure the gaseous as well as the dissolved concentration of N2O. Furthermore, the gas flow rate from each reactor was measured and the gas flux was estimated. The results confirmed that the anoxic reactor represents the main source of nitrous oxide production...
November 22, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27883287/definition-classification-and-retrospective-analysis-of-photostimulable-phosphor-image-artefacts-and-errors-in-intraoral-dental-radiography
#18
Armagan Caliskan, Ayse Pinar Sumer
OBJECTIVES: To detect and determine image error and artefact types in intraoral radiographs obtained with PSP technology, place them in an appropriate classification and retrospectively analyse the PSP specific image errors and artefacts. The causes and solutions of PSP specific errors and artefacts have also been discussed. METHODS: The radiographic database of the Ondokuz Mayıs University, Faculty of Dentistry, Department of Dentomaxillofacial Radiology was used for this study...
November 24, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27882491/influence-of-phosphorous-fertilization-on-copper-phytoextraction-and-antioxidant-defenses-in-castor-bean-ricinus-communis-l
#19
Guoyong Huang, Muhammad Shahid Rizwan, Chao Ren, Guangguang Guo, Qingling Fu, Jun Zhu, Hongqing Hu
Application of fertilizers to supply appropriate nutrients has become an essential agricultural strategy for enhancing the efficiency of phytoremediation in heavy metal contaminated soils. The present study was conducted to investigate the beneficial effects of three types of phosphate fertilizers (i.e., oxalic acid-activated phosphate rock (APR), Ca(H2PO4)2, and NaH2PO4) in the range of 0-600 mg P kg(-1) soil, on castor bean growth, antioxidants [antioxidative enzymes and glutathione (GSH)], and Cu uptake...
November 23, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27881094/neutrophil-lymphocyte-ratio-is-associated-with-arterial-stiffness-in-patients-with-peritoneal-dialysis
#20
Kedan Cai, Qun Luo, Beixia Zhu, Lina Han, Dan Wu, Zhiwei Dai, Kaiyue Wang
BACKGROUND: Patients with peritoneal dialysis are in the persistent inflammation state and have elevated arterial stiffness. Neutrophil-lymphocyte ratio(NLR) is a new inflammatory marker in renal and cardiac disorders. Brachial-ankle pulse wave velocity (baPWV) is a non-invasive measurement, which is widely used as a surrogate marker of arterial stiffness. However, there is little evidence to show an association between NLR and baPWV in patients with peritoneal dialysis. The aim of this cross-section study was to investigate the relationship between NLR and arterial stiffness measured by baPWV in patients with peritoneal dialysis...
November 24, 2016: BMC Nephrology
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