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Xiao Fang Zhu, Xu Sheng Zhao, Qi Wu, Ren Fang Shen
Background: Abscisic acid (ABA) is a well-studied phytohormone demonstrated to be involved in sub-sets of stress responses in plants, such as iron (Fe) deficiency and phosphorus (P) deficiency in Arabidopsis. However, whether ABA is involved in P deficiency in rice has not been frequently studied. The present study was undertaken to investigate the mechanism underlying ABA-aggravated P deficiency in rice (Oryza sativa). Results: P deficiency decreased ABA accumulation rapidly (within 1 h) in the roots...
March 17, 2018: Annals of Botany
Saba Mahdavi Hezaveh, Hamid Khanmohammadi, Mojgan Zendehdel
The immobilized azo-azomethine receptors on amorphous SiO2 , S-B, SiO2 nanoparticles, S-NPs, and NaY zeolite, S-ZY, have been prepared and applied as solid phase sensors for detection of HSO4 - , over other interfering anions, in 100% aqueous media. Remarkably, S-B and S-ZY show unique and rapid sensitivity towards HSO4 - , which could it easily visualized through naked eye detection even at 5×10-4 molL-1 and 4×10-4 molL-1 , respectively. The fabricated solid phase sensors were characterized using powder XRD diffraction, TGA-DTA, FE-SEM and also FT-IR techniques...
March 13, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Shima Rahim Pouran, Abolfazl Bayrami, Mohammad Saleh Shafeeyan, Abdul Aziz Abdul Raman, Wan Mohd Ashri Wan Daud
Oxidative treatment of a cationic dye solution, methylene blue, was investigated using magnetite nanoparticles and goethite in heterogeneous Fenton-like reaction, and ferrous ions in homogeneous Fenton-reaction. The aim was to compare the degradation efficiencies of the studied catalysts for decolorization of methylene blue solution as the model organic pollutant. Response surface methodology (RSM) was applied to determine the optimal operational conditions for magnetite/H2O2 and goethite/H2O2 systems. The [H2O2] of 0...
March 2018: Acta Chimica Slovenica
Jian Zheng, Wei Zhang, Feng Wang, Xiao-Ying Yu
In this present paper, a vacuum compatible microfluidic device, System for Analysis at the Liquid Vacuum Interface (SALVI), is integrated to hard X-ray absorption spectroscopy (XAS) to obtain the local structure of K3[Fe(CN)6] in aqueous solutions with three concentrations of 0.5 M, 0.05 M, and 0.005 M. The solutions were sealed in a microchannel of 500 μm wide and 300 µm deep in a portable microfluidic device. The Fe K-edge X-ray absorption spectra indicates presence of Fe(III) in the complex in water, with an octahedral geometry coordinated with 6 C atoms in the first shell with a distance of ~1...
March 21, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Jessica Henoch, Armin Auch, Fatima Diab, Klaus Eichele, Hartmut Schubert, Peter Sirsch, Theresa Block, Rainer Pöttgen, Lars Wesemann
1,1'-Dilithioferrocene was reacted with 2 equiv of isopropyl (Ar*) or methyl (Ar') substituted terphenyl tin(II) chloride. Reaction product 1, carrying the bulkier terphenyl substituent Ar*, displays a bis(stannylene) structure in the solid state without formation of a tin-tin bond. Temperature-dependent solution119 Sn NMR spectroscopy, however, revealed a dynamic interplay between bis(stannylene) (100 °C) and cyclic distannene (-80 °C). In contrast to 1, the less bulky Ar' substituent results in a cyclic distannene 2...
March 21, 2018: Inorganic Chemistry
Alison Tebo, Tyler B J Pinter, Ricardo García-Serres, Amy L Speelman, Cédric Tard, Olivier Sénèque, Geneviève Blondin, Jean-Marc Latour, James E Penner-Hahn, Nicolai Lehnert, Vincent L Pecoraro
Protein design is a powerful tool to interrogate the basic requirements for the function of a metal site in a way that allows for the selective incorporation of elements important for function. Rubredoxins are small electron transfer proteins with a reduction potential centered near 0 mV (vs. NHE). All previous attempts at the design of a rubredoxin site have focused on incorporating the canonical CXXC motifs in addition to reproducing the peptide fold or using flexible loop regions to define the morphology of the site...
March 21, 2018: Biochemistry
Paul M Bogie, Lauren R Holloway, Yana Lyon, Nicole C Onishi, Gregory J O Beran, Ryan R Julian, Richard J Hooley
A strained, "springloaded" Fe2 L3 iminopyridine mesocate shows highly variable reactivity upon postassembly reaction with competitive diamines. The strained assembly is reactive toward transimination in minutes at ambient temperature and allows observation of kinetically trapped intermediates in the self-assembly pathway. When diamines are used that can only form less favored cage products upon full equilibration, trapped ML3 fragments with pendant, "hanging" NH2 groups are selectively formed instead...
March 21, 2018: Inorganic Chemistry
Cezar A Bizzi, Sandra M Cruz, Lucas Schmidt, Robert A Burrow, Juliano S Barin, Jose N G Paniz, Erico M M Flores
A new method for analytical applications based on the Maxwell-Wagner effect is proposed. Considering the interaction of carbonaceous materials with an electromagnetic field in the microwave frequency range, a very fast heating is observed due to interfacial polarization that results in localized microplasma formation. Such effect was evaluated in this work using a monomode microwave system, and temperature was recorded using an infrared camera. For analytical applications, a closed reactor under oxygen pressure was evaluated...
March 21, 2018: Analytical Chemistry
Li Wan, Hongyuan Song, Junhao Ma, Yuan Ren, Xiaowei Cheng, Jiacan Su, Qin Yue, Yonghui Deng
Iron oxide materials have wide applications due to their special physicochemical properties; however, it is a great challenge to synthesize mesoporous iron oxide based microspheres conveniently and controllably with high surface area, large pore volume and interconnected porous structures. Herein, mesoporous α-Fe2O3 based microspheres with high porosity are synthesized via a facile polymerization induced colloid assembly (PICA) method through polymerization of urea-formaldehyde resin (UF resin) and its simultaneously cooperative assembly with Fe(OH)3 colloids in aqueous solution, followed with subsequent thermal treatment...
March 21, 2018: ACS Applied Materials & Interfaces
Dnyandeo Pawar, B V Bhaskara Rao, S N Kale
A porous graphene-coated optical fiber Fabry-Perot interferometer (G-FPI) and Fe3O4-graphene nanocomposite coated Fabry-Perot interferometer (FG-FPI) have been investigated and compared for the detection of ammonia gas at room temperature. The sensor probes were subjected to ammonia concentrations varying from 1.5 ppm to 150 ppm. An increased sensitivity was observed for FG-FPI (36 pm ppm-1) when compared with that of G-FPI (25 pm ppm-1). The observed sensor detection limits for FG-FPI and G-FPI were around 7 and 10 ppb, respectively...
March 21, 2018: Analyst
Jisun Jang, Sangmoon Byun, B Moon Kim, Sunwoo Lee
Transition metal-catalyzed silylations have typically involved the use of homogeneous non-recyclable catalytic systems. In this work, the first example of a recyclable catalytic system for the synthesis of arylsilanes has been reported, which utilizes the bimetallic complex, Pd-Pt-Fe3O4 nanoparticles. Various arylsilanes were prepared by the reaction of aryl iodides (or bromides) with hydrosilanes. This methodology showed good functional group tolerance toward ester, ketone, aldehyde, nitro, and cyano groups...
March 21, 2018: Chemical Communications: Chem Comm
Alejandro Cabrera-García, Elisa Checa-Chavarria, Jesús Pacheco-Torres, Ángela Bernabeu-Sanz, Alejandro Vidal-Moya, Eva Rivero-Buceta, Germán Sastre, Eduardo Fernández, Pablo Botella
The development of contrast agents (CAs) for Magnetic Resonance Imaging (MRI) with T1-T2 dual-mode relaxivity requires the accurate assembly of T1 and T2 magnetic centers in a single structure. In this context, we have synthesized a novel hybrid material by monitoring the formation of Prussian Blue analogue Gd(H2O)4[Fe(CN)6] nanoparticles with tailored shape (from nanocrosses to nanorods) and size, and further protection with a thin and homogeneous silica coating through hydrolysis and polymerization of silicate at neutral pH...
March 21, 2018: Nanoscale
Judith M Scholing, Margreet R Olthof, Femkje Am Jonker, Tanja Gm Vrijkotte
OBJECTIVE: Inadequate maternal micronutrient status during pregnancy can lead to short- and long-term health risks for mother and offspring. The present study investigated the association between pre-pregnancy weight status and micronutrient status during pregnancy. DESIGN: Maternal blood samples were collected during early pregnancy (median 13, interquartile range 12-15 weeks) and were assayed for serum folate, ferritin, Fe and vitamin B12. Regression modelling was used to assess the association between pre-pregnancy underweight, normal weight, overweight and obesity, and micronutrient levels, as well as the odds for deficiencies...
March 21, 2018: Public Health Nutrition
Caitlin Weaver, Alexander Baker, Matthew Davis, Anna Miller, Joel D Stitzel
Pelvic fractures are serious injuries resulting in high mortality and morbidity. The objective of this study is to develop and validate local pelvic anatomical, cross-section-based injury risk metrics for a finite element (FE) model of the human body. Cross-sectional instrumentation was implemented in the pelvic region of the Global Human Body Models Consortium (GHBMC M50-O) 50th percentile detailed male FE model (v4.3). In total, 25 lateral impact FE simulations were performed using input data from cadaveric lateral impact tests performed by Bouquet et al...
February 20, 2018: Journal of Biomechanical Engineering
Wolfram Wiest, Alexander Rack, Simon Zabler, Alex Schaer, Michael Swain, Katja Nelson
State-of-the art, two-piece dental implants made from titanium alloys exhibit a complex micromechanical behavior under dynamical load. Its understanding, especially the formation of microgaps, is of crucial importance in order to predict and improve the long-term performance of such implants. Microgap formation in a loaded dental implant with a conical implant-abutment connection can be studied and quantified by synchrotron radiography with micrometer accuracy. Due to the high costs and limited access to synchrotron radiation sources, alternative approaches are needed in order to depict the microgap formation...
February 2018: Heliyon
Valéria Nagy, Anna Podmaniczki, André Vidal-Meireles, Roland Tengölics, László Kovács, Gábor Rákhely, Alberto Scoma, Szilvia Z Tóth
Background: Photobiological H2 production has the potential of becoming a carbon-free renewable energy source, because upon the combustion of H2 , only water is produced. The [Fe-Fe]-type hydrogenases of green algae are highly active, although extremely O2 -sensitive. Sulphur deprivation is a common way to induce H2 production, which, however, relies substantially on organic substrates and imposes a severe stress effect resulting in the degradation of the photosynthetic apparatus. Results: We report on the establishment of an alternative H2 production method by green algae that is based on a short anaerobic induction, keeping the Calvin-Benson-Bassham cycle inactive by substrate limitation and preserving hydrogenase activity by applying a simple catalyst to remove the evolved O2 ...
2018: Biotechnology for Biofuels
Sipla Aggarwal, Anil Kumar, Kaushal K Bhati, Gazaldeep Kaur, Vishnu Shukla, Siddharth Tiwari, Ajay K Pandey
Enhancement of micronutrient bioavailability is crucial to address the malnutrition in the developing countries. Various approaches employed to address the micronutrient bioavailability are showing promising signs, especially in cereal crops. Phytic acid (PA) is considered as a major antinutrient due to its ability to chelate important micronutrients and thereby restricting their bioavailability. Therefore, manipulating PA biosynthesis pathway has largely been explored to overcome the pleiotropic effect in different crop species...
2018: Frontiers in Plant Science
Pratishtha Gupta, Rupa Rani, Avantika Chandra, Vipin Kumar
Contamination of agricultural soil with heavy metals has become a serious concern worldwide. In the present study, Cr6+ resistant plant growth promoting Pseudomonas sp. (strain CPSB21) was isolated from the tannery effluent contaminated agricultural soils and evaluated for the plant growth promoting activities, oxidative stress tolerance, and Cr6+ bioremediation. Assessment of different plant growth promotion traits, such as phosphate solubilization, indole-3-acetic acid production, siderophores, ammonia and hydrogen cyanide production, revealed that the strain CPSB21 served as an efficient plant growth promoter under laboratory conditions...
March 20, 2018: Scientific Reports
Meili Xu, Jie Wu, Chunlian Wang, Jirong Huo, Liang Lü
To investigate the clinicopathological differences in laterally spreading tumor (LST) from the rectum and colon.
 Methods: Clinicopathological records of 198 patients with LST (116 cases in rectum, 82 cases in colon) from the Second Xiangya Hospital of Central South University between January 2012 and January 2017 were evaluated.
 Results: A total of 198 colorectal LST were included. According to the endoscopic classification, nodular mixed type (LST-GM), homogeneous type (LST-GH), flat elevated type(LST-FE) and pseudodepressed type (LST-PD) were 127(64...
February 28, 2018: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
Huei-Hsuan Tsai, Jorge Rodriguez-Celma, Lan Ping, Yu-Ching Wu, Isabel Cristina Vélez-Bermúdez, Wolfgang Schmidt
Iron (Fe) is an essential mineral nutrient and an important factor for the composition of natural plant communities. Low Fe availability in aerated soils with neutral or alkaline pH has led to the evolution of elaborate mechanisms that extract Fe from the soil solution. In Arabidopsis thaliana, Fe is acquired by an orchestrated strategy that comprises mobilization, chelation, and reduction of Fe3+ prior to its uptake. We show here that At3g12900, previously annotated as scopoletin 8-hydroxylase (S8H), participates in Fe acquisition by mediating the biosynthesis of fraxetin (7,8-dihydroxy-6-methoxycoumarin), a coumarin derived from the scopoletin pathway...
March 20, 2018: Plant Physiology
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