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https://www.readbyqxmd.com/read/29349863/experimental-observation-of-thermally-excited-triplet-states-of-heavier-group-15-element-centered-diradical-dianions
#1
Yong Fang, Li Zhang, Cheng Cheng, Yue Zhao, Manabu Abe, Gengwen Tan, Xinping Wang
One-electron reductions of Mes*As=Fl* (1; Fl* = 2,7-di-tert-butylfluorenylidene, Mes* = 2,4,6-tBu3C6H2) and diarsaalkenes [1,2-b]-IF(=AsMes*)2 (2; IF = indenofluorene) with potassium led to the isolation of the arsenic-centered radical anion salts 1K and 2K, respectively. The diradical dianion salts 2K2 and 3K2 were afforded by the reduction of 2 and 2,8-tBu2-[2,1-b]-IF(=AsMes*)2 (3) with an excess amount of KC8. The radicals have been investigated by single-crystal X-ray crystallography, EPR and UV-Vis absorption spectroscopy, along with theoretical calculations...
January 18, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29344800/platycodon-saponins-from-platycodi-radix-platycodon-grandiflorum-for-the-green-synthesis-of-gold-and-silver-nanoparticles
#2
Yoonho Choi, Sehyeon Kang, Song-Hyun Cha, Hyun-Seok Kim, Kwangho Song, You Jeong Lee, Kyeongsoon Kim, Yeong Shik Kim, Seonho Cho, Youmie Park
A green synthesis of gold and silver nanoparticles is described in the present report using platycodon saponins from Platycodi Radix (Platycodon grandiflorum) as reducing agents. Platycodin D (PD), a major triterpenoidal platycodon saponin, was enriched by an enzymatic transformation of an aqueous extract of Platycodi Radix. This PD-enriched fraction was utilized for processing reduction reactions of gold and silver salts to synthesize gold nanoparticles (PD-AuNPs) and silver nanoparticles (PD-AgNPs), respectively...
January 17, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29342351/organic-mixed-valence-compounds-derived-from-cyclic-alkyl-amino-carbenes
#3
Max M Hansmann, Mohand Melaimi, Guy Bertrand
Readily available room temperature stable organic mixed valence compounds are prepared by one-electron reduction of cyclic bis(iminium) salts [derived from cyclic (alkyl)(amino)carbenes] bridged by various spacers. These compounds show characteristic intervalence charge transfer (IV-CT) bands in the near-infrared (NIR). Cyclic voltammetry, EPR, IR, UV-VIS and X-ray studies, as well as DFT calculations, show that depending on the nature of the spacer, these mixed valence compounds range from class III to borderline class I/II...
January 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29342282/membrane-fluxes-bypass-flows-and-sodium-stress-in-rice-the-influence-of-silicon
#4
Rubens Flam-Shepherd, Wayne Q Huynh, Devrim Coskun, Ahmed M Hamam, Dev T Britto, Herbert J Kronzucker
Provision of silicon (Si) to roots of rice (Oryza sativa L.) can alleviate salt stress by blocking apoplastic, transpirational bypass flow of Na+ from root to shoot. However, little is known about how Si affects Na+ fluxes across cell membranes. Here, we measured radiotracer fluxes of 24Na+, plasma membrane depolarization, tissue ion accumulation, and transpirational bypass flow, to examine the influence of Si on Na+ transport patterns in hydroponically grown, salt-sensitive (cv. IR29) and salt-tolerant (cv...
January 11, 2018: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29337559/totally-organic-redox-active-ph-sensitive-nanoparticles-stabilized-by-amphiphilic-aromatic-polyketones
#5
Esteban Araya-Hermosilla, José Catalán-Toledo, Fabian Muñoz-Suescun, Felipe Oyarzun-Ampuero, Patrizio Raffa, Lorenzo Massimo Polgar, Francesco Picchioni, Ignacio Moreno-Villoslada
Amphiphilic aromatic polymers have been synthesized by grafting aliphatic polyketones with 4-(aminomethyl)benzoic acid at different molar ratios via the Paal-Knorr reaction. The resulting polymers, showing diketone conversion degree of 16, 37, 53, and 69 %, have been complexed with the redox-active 2,3,5-triphenyl-2H-tetrazolium chloride, precursor molecule with which aromatic-aromatic interactions are held. Upon addition of ascorbic acid to the complexes, in-situ reduction of the tetrazolium salt produced 1,3,5-triphenylformazan nanoparticles stabilized by the amphiphilic polymers...
January 16, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29334190/the-effects-of-low-levels-of-trivalent-ions-on-a-standard-strain-of-escherichia-coli-atcc-11775-in-aqueous-solutions
#6
Can Deng, Xinpeng Li, Xinkai Xue, Richard M Pashley
Considering the ever-growing usage of trivalent salts in water treatment, for example, lanthanum salts in rare earth, AlCl3 and FeCl3 , the effects of different trivalent cations on the bacterium Escherichia coli (E. coli) ATCC 11775 strain have been studied in aqueous solutions. From colony incubation studies, the colony-forming unit (CFU) densities were found to decrease significantly in the presence of even low levels (10-5  mol/L) of lanthanum chloride. This level of reduction in CFU number is comparable to the results obtained using the known bacteriocidal cationic surfactant, C14 TAB...
January 15, 2018: MicrobiologyOpen
https://www.readbyqxmd.com/read/29334076/pt-decorated-mos-sub-2-sub-nanoflakes-for-ultrasensitive-resistive-humidity-sensor
#7
Debasree Burman, Sumita Santra, Panchanan Pramanik, Prasanta Kumar Guha
In this work, we report the fabrication of a low power, humidity sensor where platinum nanoparticles (NPs) decorated few-layered Molybdenum disulphide (MoS<sub>2</sub>) nanoflakes have been used as the sensing layer. A mixed solvent was used to exfoliate the nanoflakes from the bulk powder. Then the Pt/MoS<sub>2</sub> composites were prepared by reducing Pt NPs from chloroplatinic acid hexahydrate using a novel reduction technique using sulfide salt. The successful reduction and composite preparation were confirmed using various material characterization tools like Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Raman spectroscopy and UV-visible spectroscopy (UV-Vis)...
January 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29328530/fusing-planar-group-to-a-pi-bowl-electronic-and-molecular-structure-aromaticity-and-solid-state-packing-of-naphthocorannulene-and-its-anions
#8
Zheng Zhou, Sarah Spisak, Qi Xu, Andrey Rogachev, Zheng Wei, Massimo Marcaccio, Marina A Petrukhina
Molecular and electronic structure, reduction and coordination abilities of a PAH having a planar naphtho-group fused to the corannulene bowl have been investigated for the first time using a combination of theoretical and experimental tools. A direct comparison of naphtho[2,3-a]corannulene (C28H14, 1) with parent corannulene (C20H10, 2) revealed the effect of framework topology change on electronic properties and aromaticity of 1. Two reversible one-electron reduction processes with the formal reduction potentials at -2...
January 12, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29325124/limited-salt-consumption-reduces-the-incidence-of-chronic-kidney-disease-a-modeling-study
#9
Marieke A H Hendriksen, Eelco A B Over, Gerjan Navis, Jaap A Joles, Ewout J Hoorn, Ron T Gansevoort, Hendriek C Boshuizen
Background: In addition to blood pressure and cardiovascular disease, high-salt intake has been associated with renal diseases. The aim of this study is to estimate the potential health impact of salt reduction on chronic kidney disease (CKD) and end-stage kidney disease (ESKD) in the Netherlands. Methods: We developed a dynamic population health modeling tool to estimate the health impact of salt reduction on CKD and ESKD. We used data from the PREVEND study and extrapolated that to the Dutch population aged 30-75 years...
January 9, 2018: Journal of Public Health
https://www.readbyqxmd.com/read/29323234/caveolin-1-promotes-renal-water-and-salt-reabsorption
#10
Yan Willière, Aljona Borschewski, Andreas Patzak, Tatiana Nikitina, Carsten Dittmayer, Anna L Daigeler, Markus Schuelke, Sebastian Bachmann, Kerim Mutig
Caveolin-1 (Cav1) is essential for the formation of caveolae. Little is known about their functional role in the kidney. We tested the hypothesis that caveolae modulate renal salt and water reabsorption. Wild-type (WT) and Cav1-deficient (Cav1-/-) mice were studied. Cav1 expression and caveolae formation were present in vascular cells, late distal convoluted tubule and principal connecting tubule and collecting duct cells of WT but not Cav1-/- kidneys. Urinary sodium excretion was increased by 94% and urine flow by 126% in Cav1-/- mice (p < 0...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321686/effect-of-monitoring-salt-concentration-of-home-prepared-dishes-and-using-low-sodium-seasonings-on-sodium-intake-reduction
#11
Misako Nakadate, Junko Ishihara, Motoki Iwasaki, Kaori Kitamura, Erika Kato, Junta Tanaka, Kazutoshi Nakamura, Takuma Ishihara, Ayumi Shintani, Ribeka Takachi
BACKGROUND/OBJECTIVES: Objective methods such as the monitoring of salt concentrations in home-prepared dishes may be effective in reducing salt intake. We investigated the effect of monitoring the salt concentration of home-prepared dishes (Monitoring) on salt reduction and change in taste threshold, and the effect of the simultaneous use of low-sodium seasonings (Seasoning) to compare the effect of Monitoring with the conventional method. SUBJECTS/METHODS: We conducted a double-blind randomized controlled study using a 2 × 2 factorial design with two interventions...
January 10, 2018: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/29321218/non-uniform-relationship-between-salt-status-and-aldosterone-activity-in-patients-with-chronic-kidney-disease
#12
Alison H M Taylor, Alastair J Rankin, Emily P McQuarrie, E Marie Freel, Natalie Z M Homer, Ruth Andrew, Alan G Jardine, Patrick B Mark
BACKGROUND: Hypertension is prevalent in chronic kidney disease (CKD). Studies suggest that reduction in dietary salt intake reduces blood pressure (BP). We studied relationships between salt intake, BP and renin angiotensin system regulation in order to establish if it is disordered in CKD. METHODS: Mechanistic crossover study of CKD patients versus non-CKD controls. Participants underwent modified saline suppression test prior to randomisation to either low or high salt diet for 5 days and then crossed over to the alternate diet...
January 10, 2018: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29320517/explaining-the-decline-in-coronary-heart-disease-mortality-rates-in-the-slovak-republic-between-1993-2008
#13
Marek Psota, Piotr Bandosz, Eva Gonçalvesová, Mária Avdičová, Mária Bucek Pšenková, Martin Studenčan, Jarmila Pekarčíková, Simon Capewell, Martin O'Flaherty
OBJECTIVE: Between the years 1993 and 2008, mortality rates from coronary heart disease (CHD) in the Slovak Republic have decreased by almost one quarter. However, this was a smaller decline than in neighbouring countries. The aim of this modelling study was therefore to quantify the contributions of risk factor changes and the use of evidence-based medical therapies to the CHD mortality decline between 1993 and 2008. METHODS: We identified, obtained and scrutinised the data required for the model...
2018: PloS One
https://www.readbyqxmd.com/read/29318869/solid-state-structure-and-optical-and-magnetic-properties-of-free-base-tetra-4-pyridyl-porphyrin-h2t-4-py-p-%C3%A2-radical-anions
#14
Dmitri Valentinovich Konarev, Alexey V Kuzmin, Salavat Salimyanovich Khasanov, Alexander F Shestakov, Evgeniya I Yudanova, Akihiro Otsuka, Hideki Yamochi, Hiroshi Kitagawa, Rimma Nikolaevna Lyubovskaya
Сrystalline {cryptand[2,2,2](K+)}{H2T(4-Py)P}(.-).C6H4Cl2 (1) salt with tetra(4-pyridyl)porphyrin radical anions was obtained allowing one to study the effect of reduction on metal-free porphyrin macrocycle. In contrast to pristine H2T(4-Py)P, the H2T(4-Py)P(.-) radical anions show alternation of the C-C(meso) bonds due to partial loss of aromaticity of the porphyrin macrocycle. Short and long bonds have the average length of 1.396(3) and 1.426(3) Å with the difference between them of 0.03 Å. Reduction affects position of the Soret and Q-bands of porphyrin observed in the spectrum of 1 at 439 and 512, 583, 614 nm, and new bands of radical anion are manifested at 684, 755 and 900 nm...
January 10, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29318248/flux-synthesis-of-regular-bi4tao8cl-square-nanoplates-exhibiting-dominant-exposure-surfaces-of-001-crystal-facets-for-photocatalytic-reduction-of-co2-to-methane
#15
Liang Li, Qiutong Han, Lanqin Tang, Yuan Zhang, Ping Li, Yong Zhou, Zhigang Zou
Herein, orthorhombic regular Bi4TaO8Cl square nanoplates with an edge length of about 500 nm and a thickness of about 100 nm were successfully synthesized using a facile molten salt route. The as-prepared square nanoplates have been proven to be of {001} crystal facets as two dominantly exposed surfaces. The density functional theory calculation and photo-deposition of noble metal experiment demonstrate the electron and hole separation on different crystal facets and reveal that {001} crystal facets are in favor of the reduction reaction...
January 10, 2018: Nanoscale
https://www.readbyqxmd.com/read/29317626/dynamic-metal-ligand-coordination-for-multicolour-and-water-jet-rewritable-paper
#16
Yun Ma, Pengfei She, Kenneth Yin Zhang, Huiran Yang, Yanyan Qin, Zihan Xu, Shujuan Liu, Qiang Zhao, Wei Huang
Rewritable paper has recently become prevalent in both academic research and marketplace due to the potential environmental advantages, including forest conservation, pollution reduction, energy saving and resource sustainability. However, its real-life applications are limited by a lack of effective strategy to realize multicolour and water-jet printing on rewritable paper with long legible image-lasting times. Herein, we report an effective strategy to construct rewritable paper based on colour or luminescence switching induced by dynamic metal-ligand coordination...
January 9, 2018: Nature Communications
https://www.readbyqxmd.com/read/29305981/the-effect-of-formulation-additives-on-in-vitro-dissolution-absorption-profile-and-in-vivo-bioavailability-of-telmisartan-from-brand-and-generic-formulations
#17
Enikő Borbás, Zsombor K Nagy, Brigitta Nagy, Attila Balogh, Balázs Farkas, Oksana Tsinman, Konstantin Tsinman, Bálint Sinkó
In this study, brand and four generic formulations of telmisartan, an antihypertensive drug, were used in in vitro simultaneous dissolution-absorption, investigating the effect of different formulation additives on dissolution and on absorption through an artificial membrane. The in vitro test was found to be sensitive enough to show even small differences between brand and generic formulations caused by the use of different excipients. By only changing the type of filler from sorbitol to mannitol in the formulation, the flux through the membrane was reduced by approximately 10%...
January 3, 2018: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29305969/an-aldo-keto-reductase-bbakr1-is-involved-in-stress-response-and-detoxification-of-heavy-metal-chromium-but-not-required-for-virulence-in-the-insect-fungal-pathogen-beauveria-bassiana
#18
Huifang Wang, Zhangjiang He, Linli Luo, Xin Zhao, Zhuoyue Lu, Tingying Luo, Min Li, Yongjun Zhang
The aldo-keto reductases (AKRs) belong to the NADP-dependent oxidoreductase superfamily, which play important roles in various physiological functions in prokaryotic and eukaryotic organisms. However, many AKR superfamily members remain uncharacterized. Here, a downstream target gene of the HOG1 MAPK pathways coding for an aldo-keto reductase, named Bbakr1, was characterized in the insect fungal pathogen, Beauveria bassiana. Bbakr1 expression increased in response to osmotic and salt stressors, and oxidative and heavy metal (chromium) stress...
January 3, 2018: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/29305801/electrochemical-mineralization-and-detoxification-of-naphthenic-acids-on-boron-doped-diamond-anodes
#19
Nazely Diban, Ane Urtiaga
Electrochemical oxidation (ELOX) with boron-doped diamond (BDD) anodes was successfully applied to degrade a model aqueous solution of a mixture of commercial naphthenic acids (NAs). The model mixture was prepared resembling the NA and salt composition of oil sands process-affected water (OSPW) as described in the literature. The initial concentration of NAs between 70 and 120 mg/L did not influence the electrooxidation kinetics. However, increasing the applied current density from 20 to 100 A/m2 and the initial chloride concentration from 15 to 70 and 150 mg/L accelerated the rate of NA degradation...
January 5, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29303259/metal-free-regio-and-chemoselective-hydroboration-of-pyridines-catalyzed-by-1-3-2-diazaphosphenium-triflate
#20
Bin Rao, Che Chang Chong, Rei Kinjo
N-Heterocyclic phosphenium triflates (NHP-OTf) 1 serve as efficient catalysts for the regio- and chemoselective hydroboration of pyridines under ambient condition with good functional group tolerance. Mechanistic studies indicate that a boronium salt, [(Py)2·Bpin]OTf 4, is generated concomitant with NHP-H 5 via hydride abstraction from HBpin by 1 in the initial reaction step. Hydride reduction of the activated pyridine in [(Py)2·Bpin]OTf 4 by NHP-H 5 affords the 1,4-hydroboration product selectively. Thus, the phosphenium species act as a hydrogen transfer reagent in the catalytic cycle...
January 5, 2018: Journal of the American Chemical Society
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