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https://www.readbyqxmd.com/read/28922771/a-specific-role-of-iron-in-promoting-meristematic-cell-division-during-adventitious-root-formation
#1
Alexander Hilo, Fahimeh Shahinnia, Uwe Druege, Philipp Franken, Michael Melzer, Twan Rutten, Nicolaus von Wirén, Mohammad-Reza Hajirezaei
Adventitious root (AR) formation is characterized by a sequence of physiological and morphological processes and determined by external factors, including mineral nutrition, the impacts of which remain largely elusive. Morphological and anatomical evaluation of the effects of mineral elements on AR formation in leafy cuttings of Petunia hybrida revealed a striking stimulation by iron (Fe) and a promotive action of ammonium (NH4+). The optimal application period for these nutrients corresponded to early division of meristematic cells in the rooting zone and coincided with increased transcript levels of mitotic cyclins...
July 10, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28922646/synthesis-spectral-characterization-and-computed-optical-analysis-of-potent-triazole-based-compounds
#2
Sajjad H Sumrra, Fazila Mushtaq, Muhammad Khalid, Muhammad Asam Raza, Muhammad Faizan Nazar, Bakhat Ali, Ataualpa A C Braga
Biologically active triazole Schiff base ligand (L) and metal complexes [Fe(II), Co(II), Ni(II), Cu(II) and Zn(II)] are reported herein. The ligand acted as tridentate and coordinated towards metallic ions via azomethine-N, triazolic-N moiety and deprotonated-O of phenyl substituents in an octahedral manner. These compounds were characterized by physical, spectral and analytical analysis. The synthesized ligand and metal complexes were screened for antibacterial pathogens against Chromohalobacter salexigens, Chromohalobacter israelensi, Halomonas halofila and Halomonas salina, antifungal bioassay against Aspergillus niger and Aspergellus flavin, antioxidant (DPPH, phosphomolybdate) and also for enzyme inhibition [butyrylcholinesterase (BChE) and acetylcholinesterase (AChE)] studies...
September 13, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28922637/optical-activity-of-co-porphyrin-in-the-light-of-ir-and-raman-spectroscopy-a-critical-dft-investigation
#3
Debesh R Roy, Esha V Shah, Sutapa Mondal Roy
A critical investigation on the structure, electronic properties and optical activities of a series of transition metal doped porphyrins (TMP; TM=Fe, Co, Ni) in the light of infrared and Raman spectroscopy is performed, under density functional formalism. The structure and electronic properties are studied in terms of ionization potential, electron affinity, chemical hardness (η), binding energies of the transition metals (BETM) etc. The origin of the optical activities, especially the visibly active cobalt porphyrin is addressed through critical study on their infrared and Raman spectra...
September 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28922630/effects-of-iron-and-calcium-carbonate-on-contaminant-removal-efficiencies-and-microbial-communities-in-integrated-wastewater-treatment-systems
#4
Zhimiao Zhao, Xinshan Song, Yinjiang Zhang, Yufeng Zhao, Bodi Wang, Yuhui Wang
In the paper, we explored the influences of different dosages of iron and calcium carbonate on contaminant removal efficiencies and microbial communities in algal ponds combined with constructed wetlands. After 1-year operation of treatment systems, based on the high-throughput pyrosequencing analysis of microbial communities, the optimal operating conditions were obtained as follows: the ACW10 system with Fe(3+) (5.6 mg L(-1)), iron powder (2.8 mg L(-1)), and CaCO3 powder (0.2 mg L(-1)) in influent as the adjusting agents, initial phosphorus source (PO4(3-)) in influent, the ratio of nitrogen to phosphorus (N/P) of 30 in influent, and hydraulic retention time (HRT) of 1 day...
September 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28922495/formation-of-ni-fe-mixed-diselenide-nanocages-as-a-superior-oxygen-evolution-electrocatalyst
#5
Jianwei Nai, Yan Lu, Le Yu, Xin Wang, Xiong Wen David Lou
Exploring effective electrocatalysts is a crucial requirement for boosting the efficiency of water splitting to obtain clean fuels. Here, a self-templating strategy is reported to synthesize Ni-Fe mixed diselenide cubic nanocages for the electrocatalytic oxygen evolution reaction (OER). The diselenide nanocages are derived from corresponding Prussian-blue analog nanocages, which are first obtained by treating the nanocube precursor with a site-selective ammonia etchant. The resulting Ni-Fe mixed diselenide nanocages perform as a superior OER electrocatalyst, which affords a current density of 10 mA cm(-2) at a small overpotential of 240 mV; a high current density, mass activity, and turnover frequency of 100 mA cm(-2) , 1000 A g(-1) , and 0...
September 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28922485/novel-3d-semiconducting-open-frameworks-based-on-cuprous-bromides-with-visible-light-driven-photocatalytic-properties
#6
Xiao-Wu Lei, Cheng-Yang Yue, Jun-Chao Wei, Rui-Qing Li, Fu-Qi Mi, Yan Li, Lu Gao, Quan-Xiu Liu
Visible light driven photocatalysts based on crystalline microporous metal halogenides received much less attention compared with dense or composite oxide semiconductors. Using the well-known photosensitive transition metal-complexes [TM(2,2-bipy)3 ](2+) (TM=Fe, Co, Ni, Ru) as templates, a special three-dimensional (3D) metal halogenide framework of [TM(2,2-bipy)3 ]Cu4 Br6 was designed with [Cu4 Br4 ] cluster as 4-connected node. These microporous materials feature narrow band gaps and stable visible light driven photocatalytic properties including water reduction to provide H2 and photodegradation of organic pollutants...
August 9, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28922141/towards-an-in-plane-methodology-to-track-breast-lesions-by-using-mammograms-and-patient-specific-finite-element-simulations
#7
Andres Lapuebla-Ferri, Jose Cegoñino-Banzo, Antonio-Jose Jimenez-Mocholi, Amaya Perez Del Palomar
In breast cancer screening or diagnosis, it is usual to combine different images in order to locate a lesion as accurately as possible. These images are generated by using a single or several imaging techniques. As X-ray based mammography is used widespread, a breast lesion is located in the same plane of the image (mammogram), but tracking of a breast lesion across mammograms corresponding to different views is a daring task for medical physicians. According to this, simulation tools and methodologies that use patient-specific numerical models can facilitate the task of fusing information from different images...
September 18, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28921972/what-can-be-learned-from-nuclear-resonance-vibrational-spectroscopy-vibrational-dynamics-and-hemes
#8
W Robert Scheidt, Jianfeng Li, J Timothy Sage
Nuclear resonance vibrational spectroscopy (NRVS; also known as nuclear inelastic scattering, NIS) is a synchrotron-based method that reveals the full spectrum of vibrational dynamics for Mössbauer nuclei. Another major advantage, in addition to its completeness (no arbitrary optical selection rules), is the unique selectivity of NRVS. The basics of this recently developed technique are first introduced with descriptions of the experimental requirements and data analysis including the details of mode assignments...
September 18, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28921954/remote-late-stage-oxidation-of-aliphatic-c-h-bonds-in-amide-containing-molecules
#9
Takeshi Nanjo, Emilio Carlos de Lucca, M Christina White
Amide-containing molecules are ubiquitous in natural products, pharmaceuticals, and materials science. Due to their intermediate electron-richness, they are not amenable to any of the previously developed N-protection strategies known to enable remote aliphatic C-H oxidations. Using information gleaned from a systematic study of the main features that makes remote oxidations of amides in peptide settings possible, we developed an imidate salt protecting strategy that employs methyl trifluoromethanesulfonate (MeOTf) as a reversible alkylating agent...
September 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28921912/fate-of-worn-out-functional-teeth-in-the-upper-jaw-dentition-of-sicyopterus-japonicus-gobioidei-sicydiinae-during-tooth-replacement
#10
Noriyuki Sahara, Keita Moriyama, Midori Iida, Shun Watanabe
Mochizuki and Fukui (1983) studied the development and replacement of the upper jaw teeth in a Japanese fish species, Sicyopterus japonicus (Gobioidei: Sicydiinae), and they reported that worn-out functional teeth in the upper jaw were not shed outside the skin but were taken into the soft tissue of the upper jaw and completely resorbed there. To date, however, this phenomenon appears poorly documented. Furthermore, the mechanism for the resorption of these teeth remains to be determined. In the present study, we examined this phenomenon by using 3D micro-computed tomography (m-CT), scanning electron microscopy (SEM), and various techniques of light (LM) and electron (EM) microcopy...
September 16, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28921847/n-n-methylenebis-acrylamide-crosslinked-poly-acrylic-acid-particles-as-doxorubicin-carriers-a-comparison-between-release-behavior-of-physically-loaded-drug-and-conjugated-drug-via-acid-labile-hydrazone-linkage
#11
Seyedeh Mahnaz Modarresi-Saryazdi, Vahid Haddadi-Asl, Mehdi Salami-Kalajahi
N,N'-methylenebis(acrylamide) (MBA)-crosslinked poly(acrylic acid) (PAA) particles with low degree of crosslinking were synthesized using distillation precipitation polymerization (DPP). Size and size distribution of particles were obtained using DLS and FE-SEM and results showed that microspheres had a narrow size dispersity. (1) H NMR results indicated that amount of crosslinker in structure of particles is a little more than the molar percentage of feeded MBA due to greater activity ratio of MBA than AA...
September 18, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28921771/iron-deficiency-stress-can-induce-mxnas1-protein-expression-to-facilitate-iron-redistribution-in-malus-xiaojinensis
#12
Chaohua Sun, Mudan Yuan, Longmei Zhai, Duyue Li, Xinzhong Zhang, Ting Wu, Xuefeng Xu, Yi Wang, Zhenhai Han
Iron (Fe) is a vital trace element in plants and deficiency of this element in apple trees can reduce fruit quality. Nicotianamine (NA) is known to play an important role in Fe transport and endogenous hormone balance. In the present study, we investigated the role of a nicotianamine synthase 1 gene (MxNas1) in an apple species, Malus xiaojinensis, that has an Fe-efficient genotype than other apple species and ecotypes. To characterize the response of M. xiaojinensis to Fe-deficiency, we used quantitative Q-PCR to determine the level of expression of MxNas1 and western blot to measure protein levels...
September 16, 2017: Plant Biology
https://www.readbyqxmd.com/read/28921403/biochar-composites-with-nano-zerovalent-iron-and-eggshell-powder-for-nitrate-removal-from-aqueous-solution-with-coexisting-chloride-ions
#13
Munir Ahmad, Mahtab Ahmad, Adel R A Usman, Abdullah S Al-Faraj, Adel S Abduljabbar, Mohammad I Al-Wabel
Biochar (BC) was produced from date palm tree leaves and its composites were prepared with nano zerovalent iron (nZVI-BC) and hen eggshell powder (EP-BC). The produced BC and its composites were characterized by SEM, XRD, BET, and FTIR for surface structural, mineralogical, and chemical groups and tested for their efficiency for nitrate removal from aqueous solutions in the presence and absence of chloride ions. The incidence of graphene and nano zerovalent iron (Fe(0)) in the nZVI-BC composite was confirmed by XRD...
September 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28921305/allocation-of-metals-and-trace-elements-in-different-tissues-of-piscivorous-species-phalacrocorax-carbo
#14
Hribšek Irena, Jovičić Katarina, Karadžić Branko, Skorić Stefan
Great cormorants (Phalacrocorax carbo) are piscivorous birds, and as apex predators they accumulate high levels of contaminants from the aquatic ecosystems. In the present study, we analyzed distribution of Al, Cd, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Sr, and Zn in ten tissues (muscle, liver, kidney, spleen, gizzard, heart, skin, lard, breast feathers, and remiges) of the Great cormorants in the Marin Sprud locality, the Danube River, Serbia. Concentrations of elements in tissues were assessed by using inductively coupled plasma optical spectrometry...
September 18, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28920894/electro-thermal-equivalent-3d-finite-element-model-of-a-single-neuron
#15
I Cinelli, M Destrade, M Duffy, P McHugh
OBJECTIVE: We propose a novel approach for modelling the inter-dependence of electrical and mechanical phenomena in nervous cells, by using electro-thermal equivalences in finite element (FE) analysis so that existing thermo-mechanical tools can be applied. METHODS: First, the equivalence between electrical and thermal properties of the nerve materials is established, and results of a pure heat conduction analysis performed in Abaqus CAE Software 6.13-3 are validated with analytical solutions for a range of steady and transient conditions...
September 14, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28920670/fabrication-of-hierarchical-porous-carbon-nanoflakes-for-high-performance-supercapacitors
#16
Yamin Yao, Yunqiang Zhang, Li Li, Shulan Wang, Shi Xue Dou, Xuan Liu
In the current work, the carbon nanoflakes (CNs-Fe/KOH) and porous carbon (PC-Ni/KOH) have been produced by using Fe(NO3)3/KOH and Ni(NO3)2/KOH as the co-graphitization/activation catalysts to treat the natural plane tree fluff, respectively. The as-prepared carbon materials show different morphologies when treated with different metal ions. Compared with PC-Ni/KOH, the CNs-Fe/KOH have both high graphitization degree (IG/ID = 1.53) and large SBET (1416 m2/g). In a three-electrode setup, the CNs-Fe/KOH electrode shows a high specific capacitance of 253 F/g at 10 A/g, with a capacitance retention of 92...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920627/site-preferences-in-hetero-metallic-fe9-xnix-clusters-a-combined-crystallographic-spectroscopic-and-theoretical-analysis
#17
Anastasia N Georgopoulou, Karrar Al-Ameed, Athanassios K Boudalis, Dimitrios F Anagnostopoulos, Vassilis Psycharis, John E McGrady, Yiannis Sanakis, Catherine P Raptopoulou
The reaction of mixtures of Fe(O2CMe)2·2H2O and Ni(O2CMe)2·4H2O of various compositions with di-2-pyridyl ketone (py2CO, dpk) in MeCN under an inert atmosphere afforded a family of hetero-metallic enneanuclear clusters with general formula [Fe9-xNix(μ4-OH)2(O2CMe)8(py2CO2)4] (2, x = 1.00; 3: x = 6.02; 4, x = 7.46; 5, x = 7.81). Clusters 2-5 are isomorphous to the homo-metallic [Fe9] cluster (1) previously reported by some of us, and also isostructural to the known homo-metallic [Ni9] cluster. All four clusters contain a central M(II) ion in an unusual 8-coordinate site and eight peripheral M(II) ions in distorted octahedral environments...
September 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28920436/rational-design-of-solution-processed-ti-fe-o-ternary-oxides-for-efficient-planar-ch3nh3pbi3-perovskite-solar-cells-with-suppressed-hysteresis
#18
Xin Li, Feng Hao, Xingyue Zhao, Xuewen Yin, Zhibo Yao, Ying Guo, Heping Shen, Hong Lin
Electron extraction layer (EEL) plays a critical role in organometal-halide perovskite solar cells (PSCs) by determining the charge extraction and ultimately their power conversion efficiencies. Here, Ti-Fe-O ternary oxide was firstly demonstrated as an efficient EEL candidate in the planar PSC, showing superiority in multiple aspects including the intrinsic precursor stability, coverage on the substrates, electrical properties, and energy levels compared to the widely used TiOx and the pure FeOx. By varying Fe content from 0% to 100% in the Ti-Fe-O composite, the conductivities of the resultant compact layers were markedly improved, according to consistent results from conductive atomic force microscopy (CAFM) and linear sweep voltammetry (LSV) measurements...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920126/high-energy-product-chemically-synthesized-exchange-coupled-nd2fe14b-%C3%AE-fe-magnetic-powders
#19
Harshida Parmar, T Xiao, V Chaudhary, Y Zhong, R V Ramanujan
The excellent hard magnetic properties of Nd2Fe14B based magnets have an enormous range of technological applications. Exchange-coupled Nd2Fe14B/α-Fe magnets were chemically synthesized by a microwave assisted combustion process to produce mixed oxides, followed by a reduction diffusion process to form magnetic nano-composite powder. This synthesis technique offers an inexpensive and facile platform to produce exchange coupled hard magnets. The size dependent magnetic properties were investigated. The formation mechanisms of the oxide powders and the reduction diffusion mechanism were identified...
September 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28920095/computational-study-of-quasi-2d-liquid-state-in-free-standing-platinum-silver-gold-and-copper-monolayers
#20
Li-Ming Yang, Ariel B Ganz, Matthew Dornfeld, Eric Ganz
Recently, freestanding atomically thick Fe metal patches up to 10 atoms wide have been fabricated experimentally in tiny pores in graphene. This concept can be extended conceptually to extended freestanding monolayers. We have therefore performed ab initio molecular dynamics simulations to evaluate the early melting stages of platinum, silver, gold, and copper freestanding metal monolayers. Our calculations show that all four freestanding monolayers will form quasi-2D liquid layers with significant out-of-plane motion and diffusion in the plane...
December 2016: Condens Matter
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