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https://www.readbyqxmd.com/read/28641371/effects-of-changes-in-leaf-properties-mediated-by-methyl-jasmonate-meja-on-foliar-absorption-of-zn-mn-and-fe
#1
Cui Li, Peng Wang, Neal W Menzies, Enzo Lombi, Peter M Kopittke
Background and Aims: Foliar fertilization to overcome nutritional deficiencies is becoming increasingly widespread. However, the processes of foliar nutrient absorption and translocation are poorly understood. The present study aimed to investigate how cuticular leaf properties affect the absorption of foliar-applied nutrients in leaf tissues. Methods: Given that methyl jasmonate (MeJA) can cause alterations in leaf properties, we applied 1 m m MeJA to sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ) and soybean ( Glycine max ) to assess changes in leaf properties...
June 21, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28641207/ros-and-calcium-signaling-mediated-pathways-involved-in-stress-responses-of-the-marine-microalgae-dunaliella-salina-to-enhanced-uv-b-radiation
#2
Xinxin Zhang, Xuexi Tang, Ming Wang, Wei Zhang, Bin Zhou, You Wang
UV-B ray has been addressed to trigger common metabolic responses on marine microalgae, however, the upstream events responsible for these changes in marine microalgae are poorly understood. In the present study, a species of marine green microalgae Dunaliella salina was exposed to a series of enhanced UV-B radiation ranging from 0.25 to 1.00 KJ·m(-2) per day. The role of ROS and calcium signaling in the D. salina responses to UV-B was discussed. Results showed that enhanced UV-B radiation markedly decreased the cell density in a dose-dependent manner, but the contents of protein and glycerol that were essential for cell growth increased...
May 28, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28641150/polyamine-and-tyramine-involvement-in-nacl-induced-improvement-of-cd-resistance-in-the-halophyte-inula-chrithmoides-l
#3
Rim Ghabriche, Tahar Ghnaya, Mejda Mnasri, Hanen Zaier, Raoudha Baioui, Delphine Vromman, Chedly Abdelly, Stanley Lutts
The aim of the present work was to analyze the impact of salinity on the plant response to Cd toxicity in the Mediterranean halophyte species Inula crithmoides. For this purpose, cuttings were cultivated hydroponically during 21d in the presence of 0, 25 or 50μM CdCl2 combined or not with 0, 100, 200 and 400mM NaCl. The obtained data demonstrated that, in the absence of Cd, NaCl strongly increased plant growth (the maximal dry weight being observed at 100mM) and enhanced the Na(+)/K(+) ratio in the shoot. Cd alone strongly affected plant growth in this halophyte...
June 6, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28641143/spectroscopic-and-thermodynamic-studies-of-light-harvesting-perylenediimide-derivative-zinc-porphyrin-complex-in-aqueous-media
#4
Ahmed El-Refaey, Shaban Y Shaban, Maged El-Kemary, Mohamed E El-Khouly
Self-assembly of perylene derivative such as N,N'-bis(2(trimethylammonium iodide) ethylene)perylene-3,4,9,10-tetracarboxyldiimide (TAIPDI) can produce one-dimensional form (1D) in an aqueous media. The ability of one-dimensional TAIPDI to form light harvesting complex with water-soluble zinc porphyrin (ZnTPPS4) via the π-π and electrostatic interactions has been described. Owing to electronic interactions between the π-systems, the complex formation is accompanied by pronounced absorption spectral changes in the UV/Vis absorption bands...
June 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28641142/optical-electrical-and-ferromagnetic-studies-of-zno-fe-diluted-magnetic-semiconductor-nanoparticles-for-spintronic-applications
#5
R Elilarassi, G Chandrasekaran
In the present investigation, diluted magnetic semiconductor (Zn1-xFexO) nanoparticles with different doping concentrations (x=0, 0.02, 0.04, 0.06, and 0.08) were successfully synthesized by sol-gel auto-combustion method. The crystal structure, morphology, optical, electrical and magnetic properties of the prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive analysis using x-rays (EDAX), ultraviolet-visible spectrophotometer, fluorescence spectroscope (FS), vibrating sample magnetometer (VSM) and broad band dielectric spectrometer (BDS)...
May 31, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28641010/alpha-mangostin-reverses-multidrug-resistance-by-attenuating-the-function-of-the-multidrug-resistance-linked-abcg2-transporter
#6
Chung-Pu Wu, Sung-Han Hsiao, Megumi Murakami, Yu-Jen Lu, Yan-Qing Li, Yang-Hui Huang, Tai-Ho Hung, Suresh V Ambudkar, Yu-Shan Wu
The ATP-binding cassette (ABC) drug transporter ABCG2 can actively efflux a wide variety of chemotherapeutic agents out of cancer cells and subsequently reduce the intracellular accumulation of these drugs. Therefore, the overexpression of ABCG2 often contributes to the development of multidrug resistance (MDR) in cancer cells, which is one of the major obstacles to successful cancer chemotherapy. Moreover, ABCG2 is highly expressed in various tissues including the intestine and blood-brain barrier (BBB), limiting the absorption and bioavailability of many therapeutic agents...
June 22, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28641006/dft-simulation-of-structural-and-optical-properties-of-9-aminoacridine-half-sandwich-ru-ii-rh-iii-and-ir-iii-antitumoural-complexes-and-their-interaction-with-dna
#7
José Pedro Cerón-Carrasco, José Ruiz, Consuelo Vicente, Concepcion de Haro, Delia Bautista, Jose Zuniga, Alberto Requena
In this work, we use DFT-based methods to simulate the chemical structures, optical properties and interaction with DNA of a recently synthesized chelated CˆN 9-aminoacridine arene Ru (II) anticancer agent and two new closely related Rh(III) and Ir(III) complexes using DFT-based methods. Four chemical models and a number of theoretical approaches, which representatively include the PBE0, B97D, ωB97X, ωB97X-D, M06, and M06-L density functionals and the LANL2DZ, def2-SVP, def2- TZVP basis sets, are tested...
June 22, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28640990/opiate-antagonists-do-not-interfere-with-the-clinical-benefits-of-stimulants-in-adhd-a-double-blind-placebo-controlled-trial-of-the-mixed-opioid-receptor-antagonist-naltrexone
#8
Thomas J Spencer, Pradeep Bhide, Jinmin Zhu, Stephen V Faraone, Maura Fitzgerald, Amy M Yule, Mai Uchida, Andrea E Spencer, Anna M Hall, Ariana J Koster, Joseph Biederman
OBJECTIVE: Methylphenidate activates μ-opioid receptors, which are linked to euphoria. μ-Opioid antagonists, such as naltrexone, may attenuate the euphoric effects of stimulants, thereby minimizing their abuse potential. This study assessed whether the combination of naltrexone with methylphenidate is well-tolerated while preserving the clinical benefits of stimulants in subjects with attention-deficit/hyperactivity disorder (ADHD). METHODS: We conducted a 6-week, double-blind, placebo-controlled, randomized clinical trial of naltrexone in adults with DSM-IV ADHD receiving open treatment with a long-acting formulation of methylphenidate from January 2013 to July 2015...
June 20, 2017: Journal of Clinical Psychiatry
https://www.readbyqxmd.com/read/28640914/kinetic-analysis-of-an-anion-exchange-absorbent-for-co2-capture-from-ambient-air
#9
Xiaoyang Shi, Qibin Li, Tao Wang, Klaus S Lackner
This study reports a preparation method of a new moisture swing sorbent for CO2 capture from air. The new sorbent components include ion exchange resin (IER) and polyvinyl chloride (PVC) as a binder. The IER can absorb CO2 when surrounding is dry and release CO2 when surrounding is wet. The manuscript presents the studies of membrane structure, kinetic model of absorption process, performance of desorption process and the diffusivity of water molecules in the CO2 absorbent. It has been proved that the kinetic performance of CO2 absorption/desorption can be improved by using thin binder and hot water treatment...
2017: PloS One
https://www.readbyqxmd.com/read/28640882/quantitation-of-underivatized-branched-chain-amino-acids-in-sport-nutritional-supplements-by-capillary-electrophoresis-with-direct-or-indirect-uv-absorbance-detection
#10
Jun Qiu, Jinhao Wang, Zhongqi Xu, Huiqing Liu, Jie Ren
The branched-chain amino acids (BCAAs) including leucine (Leu), isoleucine (Ile) and valine (Val) play a pivotal role in the human body. Herein, we developed capillary electrophoresis (CE) coupled with conventional UV detector to quantify underivatized BCAAs in two kinds of sport nutritional supplements. For direct UV detection at 195 nm, the BCAAs (Leu, two enantiomers of Ile and Val) were separated in a background electrolyte (BGE) consisting of 40.0 mmol/L sodium tetraborate, and 40.0 mmol/L β-cyclodextrin (β-CD) at pH 10...
2017: PloS One
https://www.readbyqxmd.com/read/28640637/designing-transmitter-ligands-that-mediate-energy-transfer-between-semiconductor-nanocrystals-and-molecules
#11
Zhiyuan Huang, Ming Lee Tang
Molecular control of energy transfer is an attractive proposition because it allows chemists to synthetically tweak various kinetic and thermodynamic factors. In this Perspective, we examine energy transfer between semiconductor nano-crystals (NCs) and π-conjugated molecules, focusing on the transmitter ligand at the organic-inorganic interface. Efficient transfer of triplet excitons across this interface allows photons to be directed for effective use of the entire solar spectrum. For example, a photon upconversion system composed of semiconductor NCs as sensitizers, bound organic ligands as transmitters, and molecular annihilators has the advantage of large, tunable absorption cross-sections across the visible and near infrared wavelengths...
June 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28640628/oriented-gold-nanorods-and-gold-nanorod-chains-within-smectic-liquid-crystal-topological-defects
#12
Brigita Rožič, Jérôme Fresnais, Celine Molinaro, Joseph Calixte, Shivakumar Umadevi, Stephanie Lau-Truong, Nordin Felidj, Tobias Kraus, Fabrice Charra, Vincent Dupuis, Torsten Hegmann, Celine Fiorini-Debuisschert, Bruno Gallas, Emmanuelle Lacaze
We show that the use of oriented linear arrays of smectic A defects, the so-called smectic oily streaks, enables the orientation of gold nanorods (GNRs) for a large range of GNR diameters, ranging from 7 to 48 nm, and for various ligands. For the small GNRs it enables oriented end-to-end small chains of GNRs when the density is increased from around 2 GNRs/μm(2) to around 6 GNRs/μm(2). We have characterized the orientation of single GNRs by spectrophotometry and two-photon luminescence (TPL). A strongly anisotropic absorption of the composites and an on-off switching of GNR luminescence, both controlled by incident light polarization, are observed, revealing an orientation of the GNRs mostly parallel to the oily streaks...
June 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28640603/changes-in-light-absorptivity-of-molecular-weight-separated-brown-carbon-due-to-photolytic-aging
#13
Jenny Pui Shan Wong, Athanasios Nenes, Rodney J Weber
Brown carbon (BrC) are those organic compounds in atmospheric aerosols that absorb solar radiation and may play an important role on planetary radiative forcing and climate. However, little is known about the production and loss mechanisms of BrC in the atmosphere. Here, we study how the light absorptivity of BrC from wood smoke and secondary BrC generated from reaction of ammonium sulfate with methylglyoxal changes under photolytic aging by UVA radiation in the aqueous phase. Owing to its chemical complexity, BrC is separated by molecular weight using size exclusion chromatography and the response of each molecular weight fraction to aging is studied...
June 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28640598/structural-and-light-absorption-characteristics-of-complex-water-insoluble-organic-mixtures-in-urban-submicron-aerosols
#14
Qingcai Chen, Fumikazu Ikemori, Yuua Nakamura, Petr Vodicka, Kimitaka Kawamura, Michihiro Mochida
Submicrometer aerosols in the urban atmosphere of Nagoya, Japan, were collected in late winter and early spring, and the water-insoluble organic matter (WISOM) in the samples were fractionated into six subfractions based on their polarities by using solvent and normal-phase solid-phase extractions: non-polar (F1), low-polar (F2 and F3), and medium-polar (F4, F5, and F6) fractions. The overall structural characteristics of these subfractions were then analyzed using Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, and high-resolution aerosol mass spectrometry...
June 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28637034/recovery-of-food-intake-after-gastrectomy-for-gastric-cancer-based-on-a-large-scale-gastric-cancer-cohort
#15
Bang Wool Eom, Jeongseon Kim, Deok Hee Kim, Young-Il Kim, Hong Man Yoon, Soo-Jeong Cho, Jong Yeul Lee, Chan Gyoo Kim, Il Ju Choi, Young-Woo Kim, Byung-Ho Nam, Keun Won Ryu
BACKGROUND: This study was aimed at evaluating the food intake and nutritional status of patients who underwent gastrectomy for gastric cancer based on a large-scale gastric cancer cohort. METHODS: An observational prospective cohort study for gastric cancer has been conducted since 2010. From the cohort data, we selected the data for patients who completed at least 2 days of 3-day diet diaries and who underwent subtotal gastrectomy (STG) or total gastrectomy (TG)...
June 22, 2017: Digestive Surgery
https://www.readbyqxmd.com/read/28636776/facile-synthesis-and-chain-length-dependent-optical-and-structural-properties-of-diketopyrrolopyrrole-based-oligomers
#16
Satish Patil, Tushita Mukhopadhyay, Boregowda Puttaraju, Palas Roy, Jyotishman Dasgupta, Andreas Meyer
Here we report the synthesis, optical properties and solid-state packing of monodisperse oligomers of DPP up to five repeating units. Optical properties of DPP-oligomers in solution and solid state were investigated by a combination of steady-state, and transient spectroscopy. Transient absorption spectroscopy and time-correlated single photon counting (TCSPC) measurements show that the fluorescence lifetime decreases with increase in the oligomer size from monomer to trimer, thereby reaching saturation for pentameric DPP oligomer...
June 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28636565/porous-carbon-nanotubes-decorated-carbon-nanofibers-with-effective-microwave-absorption-property
#17
Tao Zhang, Bo Xiao, Pengyu Zhou, Long Xia, Guangwu Wen, Haibin Zhang
Carbon nanofibers decorated with porous carbon nanotubes have been prepared by electrospinning and annealing methods. Microwave reflection loss of the products is investigated in the frequency range of 2-18 GHz. The bandwidth with a reflection loss less than -10 dB covers a wide frequency ranging from 7.0 to 14.1 GHz with the thickness of 3.0-5.5 mm, and the minimum reflection loss is -44.5 dB at 10.7 GHz with a thickness of 2.0 mm. The large reflection loss and wide reflection band reveals that the products could be a promising candidate for microwave absorption...
June 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28636342/charge-transfer-properties-of-triarylamine-integrated-dimolybdenum-dyads
#18
Lu Chen, Suman Mallick, Ying Ning Tan, Miao Meng, Chun Y Liu
Three quadruply bonded dimolybdenum complexes equipped with a triarylamine pendant, [(DAniF)3Mo2(μ-O2CC6H4N(C6H4CH3)2] (DAniF = N,N'-di(p-anisyl)formamidinate; [OO-ph-N]), [(DAniF)3Mo2(μ-OSCC6H4N(C6H4CH3)2] ([OS-ph-N]), and [(DAniF)3Mo2(μ-S2CC6H4N(C6H4CH3)2] ([SS-ph-N]), have been synthesized and characterized by single crystal X-ray diffraction. In electrochemical measurements, the redox couple for the organic amine group becomes irreversible, reflecting the substantially strong electronic interaction between the dimetal center and organic redox site...
June 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28636332/new-insights-into-the-wavelength-dependence-of-maldi-mass-spectrometry
#19
Marcel Niehaus, Andreas Schnapp, Annika Koch, Jens Soltwisch, Klaus Dreisewerd
The interplay between the wavelength of the laser and the absorption profile of the matrix constitutes a crucial factor in matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS). Numerous studies have shown that typically best analytical results are obtained if the laser wavelength matches the UV absorption band of the matrix in the solid state well. However, many powerful matrices exhibit peak absorptions which differ notably from the standard MALDI laser wavelengths of 337, 349, and 355 nm, respectively...
June 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28636267/strontium-releasing-fluorapatite-glass-ceramics-crystallization-behavior-microstructure-and-solubility
#20
Isabelle Denry, Ourania-Menti Goudouri, Jeffrey D Harless, E M Hubbard, Julie A Holloway
The purpose of this work was to investigate the effect of strontium partial replacement for calcium on the crystallization behavior, microstructure and solubility of fluorapatite glass-ceramics. Four glass compositions were prepared with increasing amounts of strontium partially replacing calcium. The crystallization behavior was analyzed by differential scanning calorimetry and X-ray diffraction (XRD). The microstructure was investigated by scanning electron microscopy. The chemical solubility was quantified according to ISO standard 10993-14...
June 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
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