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Xie Ping Sun, You Jin Luo, Guang Wen Zhou, Hong Wei Yi, Yuan Ping Chen, Zheng Wu, Yong Hong Xie
Potted Citrus. junos cv. Ziyang Xiangcheng seedlings were used to study the effects of selenium (Se) valence states (Se6+ and Se4+ ) on plant growth and antioxidants and antixodases in ascorbate(AsA)-glutathione (GSH) cycle. The results showed that Se6+ and Se4+ (from 1.0 mg·L-1 to 8.0 mg·L-1 ) stimulated the seedling growth by increasing plant height, leaf areas, and fresh or dry mass. Applying Se6+ significantly increased plant Se levels mainly in leaf, and applying Se4+ slightly increased Se content mainly in root...
November 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Faisal Usman, Ruqaiya Khalil, Zaheer Ul-Haq, Titpawan Nakpheng, Teerapol Srichana
We report nanomicelles of amphotericin B (AmB) using various molar ratios of AmB and sodium deoxycholate sulfate (SDCS) for inhalation with improved stability, solubility, bioactivity, and safety. The particle sizes of all aerosolized formulations are expressed as mass median aerodynamic diameter (0.9-1.6 μm), fine particle fraction (70.3-86.5%), and geometric standard deviation (1.4-2.1) which indicated their sizes are appropriate for use as an inhaler. In vitro cytotoxicity studies conducted using respiratory and kidney cell lines demonstrated that the marketed Fungizone® was toxic to macrophage and embryonic kidney cells and cell viability decreased from 96 to 48% and from 97 to 67%, respectively when the AmB equivalent concentration was increased from 1 to 16 μg/mL...
April 24, 2018: AAPS PharmSciTech
Li Zhang, Tiehu Li, Lei Huang, Zhengqin Ye, Zhongbin Ye, Xin Yan, Lili Li, Qiang Deng, Gang Chen, Jie Zhang, Zhifang Zhang
In this paper, a series of poly ammonium shale inhibitors were prepared from diethylamine, epichlorohydrin, and melamine (DEM) and their inhibition to shale were evaluated by bentonite linear expansion test, anti-swelling experiments, and mud ball experiments. Additionally, other properties of drilling fluid treated by poly ammonium were evaluated. Anti-swelling results showed that anti-swelling rate of DEM-8 reaches up to 97.8% when its concentration reaches to 0.8%. Mud ball experiment and drilling fluid evaluation showed DEM-8 has strong inhibitive capability to bentonite hydration swelling and controlling the particle size of bentonite in a large scale...
April 25, 2018: Chemistry Central Journal
Thillai Punitha, Siew-Moi Phang, Joon Ching Juan, John Beardall
Vanadium-dependent haloperoxidases (V-HPO), able to catalyze the reaction of halide ions (Cl- , Br- , I- ) with hydrogen peroxide, have a great influence on the production of halocarbons, which in turn are involved in atmospheric ozone destruction and global warming. The production of these haloperoxidases in macroalgae is influenced by changes in the surrounding environment. The first reported vanadium bromoperoxidase was discovered 40 years ago in the brown alga Ascophyllum nodosum. Since that discovery, more studies have been conducted on the structure and mechanism of the enzyme, mainly focused on three types of V-HPO, the chloro- and bromoperoxidases and, more recently, the iodoperoxidase...
April 24, 2018: Marine Biotechnology
Luisana Avilan, Baptiste Roumezi, Véronique Risoul, Christophe Sébastien Bernard, Arlette Kpebe, Mayssène Belhadjhassine, Marc Rousset, Myriam Brugna, Amel Latifi
The conversion of solar energy into hydrogen represents a highly attractive strategy for the production of renewable energies. Photosynthetic microorganisms have the ability to produce H2 from sunlight but several obstacles must be overcome before obtaining a sustainable and efficient H2 production system. Cyanobacteria harbor [NiFe] hydrogenases required for the consumption of H2 . As a result, their H2 production rates are low, which makes them not suitable for a high yield production. On the other hand, [FeFe] enzymes originating from anaerobic organisms such as Clostridium exhibit much higher H2 production activities, but their sensitivity to O2 inhibition impairs their use in photosynthetic organisms...
April 24, 2018: Applied Microbiology and Biotechnology
Joan Soldevila-Sanmartín, Teresa Calvet, Merce Font-Bardia, Concepción Domingo, José A Ayllón, Josefina Pons
The reaction of copper(ii) acetate monohydrate with p-hydroxycinnamic acid (HpOHcinn) and different pyridine derivatives (4-tert-butylpyridine, 4-tBupy; 4-acetylpyridine, 4-Acpy; 3-phenylpyridine, 3-Phpy; 4-phenylpyridine, 4-Phpy) was essayed in methanol solvent at room temperature. The crystal structures of the resulting compounds were elucidated. Their analysis shows that the choice of pyridine ligands determines different coordination modes of the pOHcinn ligand and the Cu(ii) coordination, nuclearity and geometry...
April 25, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
H Nishihara, T Kyotani
Zeolite-templated carbons (ZTCs) are ordered microporous carbons synthesized by using zeolite as a sacrificial template. Unlike well-known ordered mesoporous carbons obtained by using mesoporous silica templates, ZTCs consist of curved and single-layer graphene frameworks, thereby affording uniform micropore size (ca. 1.2 nm), developed microporosity (∼1.7 cm3 g-1), very high surface area (∼4000 m2 g-1), good compatibility with chemical modification, and remarkable softness/elasticity. Thus, ZTCs have been used in many applications such as hydrogen storage, methane storage, CO2 capture, liquid-phase adsorption, catalysts, electrochemical capacitors, batteries, and fuel cells...
April 25, 2018: Chemical Communications: Chem Comm
Albert M Iskandarov, Tomofumi Tada
The effects of cation dopants in zirconia on the H2 oxidation mechanism at the pore/nickel/zirconia triple phase boundary (TPB) were theoretically examined. Y, Sc, Al, Ce, and Ca were considered as dopants, and on-boundary, O-migration, and H-migration reaction mechanisms were examined. Based on density functional theory calculations, Y as a dopant favored the on-boundary mechanism with water molecule formation within the immediate proximity of the TPB. The corresponding rate-limiting step is H transfer from the nickel surface to the boundary...
April 25, 2018: Physical Chemistry Chemical Physics: PCCP
Kuber Singh Rawat, Biswarup Pathak
A series of flexible proton-responsive group substituted N^N-bidentate ligand based Mn(i) complexes have been studied for base free CO2 hydrogenation. We show here that proton responsive ligands play a critical role in base free CO2 hydrogenation. Our calculated reaction free energy barrier values for heterolytic H2 cleavage show that such flexible proton-responsive ligands require a very low activation energy (∼3 kcal mol-1) barrier. Such flexible proton responsive ligands improve the strong dihydrogen (HH) bonding, which in turn improves heterolytic H2 cleavage - an important step for base free CO2 hydrogenation...
April 25, 2018: Physical Chemistry Chemical Physics: PCCP
Qi Sun, Briana Aguila, Jason Perman, Aleksandr S Ivanov, Vyacheslav S Bryantsev, Lyndsey D Earl, Carter W Abney, Lukasz Wojtas, Shengqian Ma
Nature can efficiently recognize specific ions by exerting second-sphere interactions onto well-folded protein scaffolds. However, a considerable challenge remains to artificially manipulate such affinity, while being cost-effective in managing immense amounts of water samples. Here, we propose an effective approach to regulate uranyl capture performance by creating bio-inspired nano-traps, illustrated by constructing chelating moieties into porous frameworks, where the binding motif's coordinative interaction towards uranyl is enhanced by introducing an assistant group, reminiscent of biological systems...
April 24, 2018: Nature Communications
Anup K Upadhyay, Russell A Judge, Leiming Li, Ron Pithawalla, Justin Simanis, Pierre M Bodelle, Violeta L Marin, Rodger F Henry, Andrew M Petros, Chaohong Sun
The tandem TUDOR domains present in the non-catalytic C-terminal half of the KDM4A, 4B and 4C enzymes play important roles in regulating their chromatin localizations and substrate specificities. They achieve this regulatory role by binding to different tri-methylated lysine residues on histone H3 (H3-K4me3, H3-K23me3) and histone H4 (H4-K20me3) depending upon the specific chromatin environment. In this work, we have used a 2D-NMR based fragment screening approach to identify a novel fragment (1a), which binds to the KDM4A-TUDOR domain and shows modest competition with H3-K4me3 binding in biochemical as well as in vitro cell based assays...
April 19, 2018: Bioorganic & Medicinal Chemistry Letters
(no author information available yet)
No abstract text is available yet for this article.
April 24, 2018: Science Progress
Vadim Demidchik
Ion channels activated by reactive oxygen species (ROS) have been found in the plasma membrane of charophyte Nitella flixilis , dicotyledon Arabidopsis thaliana , Pyrus pyrifolia and Pisum sativum , and the monocotyledon Lilium longiflorum . Their activities have been reported in charophyte giant internodes, root trichoblasts and atrichoblasts, pollen tubes, and guard cells. Hydrogen peroxide and hydroxyl radicals are major activating species for these channels. Plant ROS-activated ion channels include inwardly-rectifying, outwardly-rectifying, and voltage-independent groups...
April 23, 2018: International Journal of Molecular Sciences
Hong-Juan Sun, Bo Liu, Tong-Jiang Peng, Xiao-Long Zhao
In this study, graphene oxides with different functionalization degrees were prepared by a facile one-step hydrothermal reflux method at various reaction temperatures using graphene oxide (GO) as starting material and p -phenylenediamine (PPD) as the modifier. The effects of reaction temperature on structure, appearance and bonding type of the obtained materials were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM)...
April 23, 2018: Materials
Xican Li, Jian Lin, Ban Chen, Hong Xie, Dongfeng Chen
In this study, two natural phenolic polyamines, kukoamine A and B, were comparatively investigated for their antioxidant and cytoprotective effects in Fenton-damaged bone marrow-derived mesenchymal stem cells (bmMSCs). When compared with kukoamine B, kukoamine A consistently demonstrated higher IC50 values in PTIO•-scavenging (pH 7.4), Cu2+ -reducing, DPPH•-scavenging, •O₂− -scavenging, and •OH-scavenging assays. However, in the PTIO•-scavenging assay, the IC50 values of each kukoamine varied with pH value...
April 21, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Zaid B Jildeh, Jan Oberländer, Patrick Kirchner, Patrick H Wagner, Michael J Schöning
In this article, we present an overview on the thermocatalytic reaction of hydrogen peroxide (H 2 O 2 ) gas on a manganese (IV) oxide (MnO 2 ) catalytic structure. The principle of operation and manufacturing techniques are introduced for a calorimetric H 2 O 2 gas sensor based on porous MnO 2 . Results from surface analyses by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) of the catalytic material provide indication of the H 2 O 2 dissociation reaction schemes. The correlation between theory and the experiments is documented in numerical models of the catalytic reaction...
April 21, 2018: Nanomaterials
Yizeng Zhang, Zhiwu Chen, Zhenya Lu
Bi₄Ti₃O12− x nanosheet photocatalysts with abundant oxygen vacancies are fabricated by a facile solid-state chemical reduction method for the first time. This method is simple in operation, has short reaction time, and can be conducted at mild temperatures (300~400 °C). The electron paramagnetic resonance, thermogravimetric analysis, X-ray photoelectron spectrometer, and positron annihilation lifetime spectra results indicate that oxygen vacancies are produced in Bi₄Ti₃O12− x , and they can be adjusted by tuning the reduction reaction conditions...
April 21, 2018: Nanomaterials
Bin Guo, Dongdong Zha, Bengang Li, Peng Yin, Panxin Li
We reported a new method to prepare polyvinyl alcohol (PVA)/thermoplastic starch (TPS) composites by using polyvinyl alcohol microspheres (PVAMS). The PVAMS/TPS composites were characterized using tensile test, scanning electron microscopy (SEM), dynamic mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA). The results exhibited that adding small amounts of PVAMSs can effectively improve the mechanical strength and toughness of the composites, especially for the 1 wt %PVAMS in TPS matrix, with a tensile strength of 3...
April 21, 2018: Materials
Kyong Kim, Seong Hyun Kim, Sung Hoon Kim, Chang Ho Yu
BACKGROUND: A lightweight rehabilitation assisting system is required to help the aged and disabled with daily life activities, thereby improving the quality of their lives. OBJECTIVE: This paper discusses the development of a metal-hydride (MH) actuator, with excellent heat transfer performance, for application in a rehabilitative system incorporating an MH module. METHODS: The operating mechanism of MH actuators requires that the mechanical power of the pneumatic actuator only be generated via heat transfer through a Peltier element and the absorption/desorption of a hydrogen-contained MH module...
April 10, 2018: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
Roberto Fernandez-Maestre
Ion mobility spectrometry (IMS) is an analytical technique used for fast and sensitive detection of illegal substances in customs and airports, diagnosis of diseases through detection of metabolites in breath, fundamental studies in physics and chemistry, space exploration and many more applications. IMS separates ions in the gas-phase drifting under an electric field according to their size to charge ratio. IMS disadvantages are false positives that delay transportation, compromise patient's health and other negative issues when IMS is used for detection...
April 24, 2018: Journal of Mass Spectrometry: JMS
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