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https://www.readbyqxmd.com/read/29776005/flexible-and-hierarchical-metal-organic-framework-composites-for-high-performance-catalysis
#1
Ning Huang, Hannah Drake, Jialuo Li, Jiangdong Pang, Ying Wang, Shuai Yuan, Qi Wang, Peiyu Cai, Junsheng Qin, Hong-Cai Zhou
The development of new types of porous composite materials is of great significance owing to their potentially improved performance over those of individual components and extensive applications in separation, energy storage, and heterogeneous catalysis. In this work, we integrated mesoporous metal-organic frameworks (MOFs) with macroporous melamine foam (MF) using a one-pot process, generating a series of MOF/MF composite materials with preserved crystallinity, hierarchical porosity, and increased stability over that of melamine foam...
May 18, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29775827/responses-of-atrazine-degradation-and-native-bacterial-community-in-soil-to-arthrobacter-sp-strain-hb-5
#2
Jianpeng Gao, Peipei Song, Guanying Wang, Jinhua Wang, Lusheng Zhu, Jun Wang
The bioremediation of soil contaminated with organic pesticides is a safe and effective approach to remove pollutants from the soil. However, whether the invasion of foreign aid organisms affects the local organisms has received increasing attention in recent years. Therefore, the purpose of this study was to examine the degradation ability of atrazine by the strain HB-5 and evaluate its effects on natural bacterial communities in a miniature pot experiment. Results showed that HB-5 accelerated the degradation of atrazine and the degradation half-life of atrazine was 3...
May 15, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29775305/one-pot-synthesis-of-four-chlorin-derivatives-by-a-divergent-ylide
#3
Junior Gonzales, Naga Venkata Satya Dinesh Kumar Bhupathiraju, Daniel Hart, Man Yuen, Maria Pia Sifuentes, Bleron Samarxhiu, Mark Maranan, Naxhije Berisha, James Batteas, Charles Michael Drain
Chlorins have unique photophysical properties that are exploited in diverse biological and materials applications. De novo chlorin synthesis with specific exocyclic motifs can be challenging and many are not stable to photobleaching and/or oxidation. A facile approach to a stable synthetic chlorin with a fused N-methyl pyrrolidine uses cyclo addition of a sarcosine-based azomethine ylide on 5,10,15,20-tetrakis-(2,3,4,5,6-pentafluorophenyl)-porphyrin (TPPF20) is reported, but this approach has limitations. We report the synthesis of stable chlorin scaffolds starting with TPPF20 using a new glycine-based N-(hydroxymethyl)-N-methelenemethanideaminium ylide...
May 18, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29775100/phytoremediation-of-btex-and-naphthalene-from-produced-water-spill-sites-using-poaceae
#4
Amanda Rose Shores, Brittany Hethcock, Melinda Laituri
Surface spills of water produced from hydraulic fracturing can expose soil and groundwater to organics such as BTEX and naphthalene (BTEX&N) as well as high concentrations of salt. As an alternative to soil excavation, we evaluated the effectiveness of BTEX&N soil remediation using 2 grasses present in Colorado. Perennial ryegrass and foxtail barley were grown separately in pots in the greenhouse and exposed to salt or a synthesized produced-water slurry containing relevant levels of salt and BTEX&N...
July 3, 2018: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29775095/study-of-microbial-diversity-in-plant-microbe-interaction-system-with-oil-sludge-contamination
#5
Monika Dhote, Anil Kumar, Anjana Jajoo, Asha Juwarkar
A 90 days greenhouse experiment was conducted for evaluation of soil microbial diversity in different treatments of rhizospheric and nonrhizospheric oil sludge contaminated soil. Various pot treatments (T1-T5) were as follows: 2% oil sludge contaminated soil was considered as control (T1); augmentation of control with preadapted microbial consortium was T2; addition of Vetiver zizanioide to control was T3; bioaugmentation of control along with V. zizanioide was T4; and bioaugmentation with V. zizanioide and bulking agent was T5...
July 3, 2018: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29775069/simultaneous-release-and-labelling-of-o-and-n-glycans-allowing-for-rapid-glycomic-analysis-by-online-lc-uv-esi-ms-ms
#6
Chengjian Wang, Yu Lu, Jianli Han, Wanjun Jin, Lingmei Li, Ying Zhang, Xuezheng Song, Linjuan Huang, Zhongfu Wang
Most glycoproteins and biological protein samples undergo both O- and N-glycosylation, making characterization of their structures very complicated and time-consuming. Nevertheless, to fully understand the biological functions of glycosylation, both the glycosylation forms need to be analyzed. Herein we report a versatile, convenient one-pot method in which O- and N-glycans are simultaneously released from glycoproteins and chromogenically labelled in situ and thus available for further characterization. In this procedure, glycoproteins are incubated with 1-phenyl-3-methyl-5-pyrazolone (PMP) in aqueous ammonium hydroxide, making O-glycans released from protein backbones by beta-elimination and N-glycans liberated by alkaline hydrolysis...
May 18, 2018: Journal of Proteome Research
https://www.readbyqxmd.com/read/29775066/cascade-multiple-diels-alder-reactions-of-styrene-derivatives-with-maleimide-or-maleic-anhydride
#7
Shohei Yoshioka, Hiroshi Aoyama, Hiromichi Fujioka, Mitsuhiro Arisawa
We developed novel one-pot multiple Diels-Alder reactions, which are frequently used in the construction of six-membered rings in functional molecular synthesis. We report triple and double Diels-Alder reactions with styrene derivatives, where the secondary Diels-Alder reaction takes place at a different position from that of the conventional Wagner-Jauregg reaction.
May 18, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29774637/potassium-octatitanate-fibers-induce-persistent-lung-and-pleural-injury-and-are-possibly-carcinogenic-in-male-fischer-344-rats
#8
Mohamed Abdelgied, Ahmed M El-Gazzar, David B Alexander, William T Alexander, Takamasa Numano, Masaaki Iigou, Aya Naiki-Ito, Hirotsugu Takase, Khaled Abbas Abdou, Akihiko Hirose, Yuhji Taquahashi, Jun Kanno, Hiroyuki Tsuda, Satoru Takahashi
Potassium octatitanate fibers (K2 O•8TiO2 , POT fibers) are widely used as an alternative to asbestos. We investigated the pulmonary and pleural toxicity of POT fibers with reference to 2 non-fibrous titanium dioxide nanoparticles (nTiO2 ), photo-reactive anatase (a-nTiO2 ) and inert rutile (r-nTiO2 ). Ten-week old male F344 rats were administered 0.5 ml of 250-μg/ml suspensions of POT fibers, a-nTiO2 , or r-nTiO2 , eight times (1 mg/rat) over a 15 day period by trans-tracheal intrapulmonary spraying (TIPS)...
May 17, 2018: Cancer Science
https://www.readbyqxmd.com/read/29774487/facile-synthesis-of-%C3%AE-alkoxymethyltriphenylphosphonium-iodides-new-application-of-pph-3-i-2
#9
Humaira Yasmeen Gondal, Zain Maqsood Cheema, Javid Hussain Zaidi, Sammer Yousuf, M Iqbal Choudhary
An efficient one pot method for the synthesis of α-alkoxymethylphosphonium iodides is developed by using PPh3 /I2 combination at room temperature. Reaction conditions are found general to synthesize wide range of structurally variant alkoxymethylphosphonium iodides in high yield (70-91%). These new functionalized phosphonium salts are further used in stereoselective synthesis of vinyl ethers as well as in carbon homologation of aldehydes.
May 17, 2018: Chemistry Central Journal
https://www.readbyqxmd.com/read/29773483/sleep-disorders-in-patients-with-postural-tachycardia-syndrome-a-review-of-the-literature-and-guide-for-clinicians
#10
REVIEW
Mitchell G Miglis, Fiona Barwick
Fatigue is common in POTS, and patients often report unrefreshing sleep. These symptoms are directly correlated with a reduced quality of life, however the treatment of sleep disorders in this population remains a challenge. This article will review the current literature on the prevalence of sleep disorders in POTS, their association with the underlying pathophysiology of POTS, and current treatment paradigms.
May 8, 2018: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/29772689/fabrication-and-characterization-of-nanoenergetic-hollow-spherical-hexanitrostibene-hns-derivatives
#11
Xiong Cao, Peng Deng, Shuangqi Hu, Lijun Ren, Xiaoxia Li, Peng Xiao, Yu Liu
The spherization of nanoenergetic materials is the best way to improve the sensitivity and increase loading densities and detonation properties for weapons and ammunition, but the preparation of spherical nanoenergetic materials with high regularization, uniform size and monodispersity is still a challenge. In this paper, nanoenergetic hollow spherical hexanitrostibene (HNS) derivatives were fabricated via a one-pot copolymerization strategy, which is based on the reaction of HNS and piperazine in acetonitrile solution...
May 16, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29772501/insights-into-the-effect-of-the-catalytic-functions-on-selective-production-of-ethylene-glycol-from-lignocellulosic-biomass-over-carbon-supported-ruthenium-and-tungsten-catalysts
#12
Lucília Sousa Ribeiro, José J Melo Órfão, Manuel Fernando Ribeiro Pereira
The one-pot conversion of cellulose to ethylene glycol (EG) was investigated using a combination of a ruthenium catalyst supported on carbon nanotubes modified with nitric acid (Ru/CNT1 ) and a tungsten catalyst supported on commercial non-treated carbon nanotubes (W/CNT0 ). This physical mixture allowed to obtain an EG yield of 41% in just 5 h at 205 °C and 50 bar of H2 , which overcame the result obtained using a Ru-W bimetallic catalyst supported on commercial carbon nanotubes (35%) under the same conditions...
May 9, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29772492/high-copper-content-in-vineyard-soils-promotes-modifications-in-photosynthetic-parameters-and-morphological-changes-in-the-root-system-of-red-niagara-plantlets
#13
Vítor Gabriel Ambrosini, Daniel José Rosa, George Wellington Bastos de Melo, Jovani Zalamena, Cesar Cella, Daniela Guimarães Simão, Leandro Souza da Silva, Henrique Pessoa Dos Santos, Moreno Toselli, Tadeu Luis Tiecher, Gustavo Brunetto
High copper (Cu) soil contents, due to the continuous vineyard application of Cu fungicides throughout the years, may impair the growth of the shoot and modify the structure of the root system. The current study aimed to investigate the threshold levels of available Cu in the soil causing toxicity effects in young grapevine plants of 'Red Niagara' cultivated in clay soils. Grapevine plantlets were cultivated in pots containing vineyard devoted soils with increasing contents of available Cu (25, 80, 100 and 165 mg kg-1 ), for 53 days...
May 8, 2018: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29772283/amphiphilic-polyurethane-hydrogels-as-smart-carriers-for-acidic-hydrophobic-drugs
#14
Lucas P Fonseca, Rafael B Trinca, Maria Isabel Felisberti
Amphiphilic hydrogels are widely reported as systems with great potential for controlled drug release. Nevertheless, the majority of studies make use of functionalization or attachment of drugs to the polymer chains. In this study, we propose a strategy of combining amphiphilic polyurethanes with pH-responsive drugs to develop smart drug carriers. While the amphiphilic character of the polymer imparts an efficient load of hydrophobic and hydrophilic drugs, the drug's characteristics determine the selectivity of the medium delivery...
May 14, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29771393/differential-responses-of-picea-asperata-and-betula-albosinensis-to-nitrogen-supply-imposed-by-water-availability
#15
Chunying Yin, Sari Palmroth, Xueyong Pang, Bo Tang, Qing Liu, Ram Oren
A pot experiment was conducted to investigate the effects of nitrogen (N) addition (0, 20, 40 g N m-2 year-1, N0, N20, N40, respectively) on the growth, and biomass accumulation and allocation of coniferous and deciduous (Picea asperata Mast. and Betula albosinensis Burk.) seedlings under a range of soil moisture limitation (40%, 50%, 60%, 80% and 100% of field capacity, FC). At 100% FC, growth of shade-tolerant P. asperata increased with N supply, while that of shade-intolerant B. albosinensis reached a maximum at N20, declining somewhat thereafter...
May 16, 2018: Tree Physiology
https://www.readbyqxmd.com/read/29771114/controlled-polymerization-in-polar-solvents-to-ultrahigh-molecular-weight-polyethylene
#16
Philip Kenyon, Melissa Wörner, Stefan Mecking
Novel complexes based on 2,4,8-triarylnaphthylamine [[(2,4-{3,5-(CF3 )2 C6 H3 }2 -8-(3,5-R2 C6 H3 )-C10 H4 )-N═C(H)-{3-(9-anthryl)-2-O-C6 H3 }-κ2 -N,O]Ni(CH3 )(pyridine)] (4-Py, R = Me; 5-Py, R = CF3 ) were synthesized from 8-arylnaphthylamines which can be generated via selective lithiation, borylation, and coupling in a one-pot procedure. Due to their living characteristics in ethylene polymerization and the particularly low propensity of 5-Py for β-H elimination as reflected by a high linearity even at elevated polymerization temperatures of 60 °C, ultrahigh molecular weight polyethylene (UHMWPE) is formed in polar organic solvents (THF, diethyl ether) as a reaction medium in a controlled polymerization ( Mw / Mn = 1...
May 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29771106/nickel-cobalt-thiospinel-nanoparticles-as-hydrodesulfurization-catalysts-the-importance-of-cation-position-structural-stability-and-sulfur-vacancy
#17
Kun Guo, Yi Ding, Jun Luo, Zhixin Yu
First-row transition metal based thiospinels are prepared via a one-pot versatile strategy and for the first time investigated as hydrodesulfurization (HDS) catalysts. XRD, TEM and XPS analysis confirm that these thiospinels consist of agglomerated nanoparticles (NPs) and contain multivalent metal cations. Among the sulfides synthesized at 230 °C, NiCo2S4 presents the highest thiophene conversion. This high intrinsic activity is found to be correlated with the normal spinel structure with Ni cations located on the tetrahedral sites and Co cations on the octahedral sites...
May 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29770376/field-studies-reveal-functions-of-chemical-mediators-in-plant-interactions
#18
REVIEW
Meredith C Schuman, Ian T Baldwin
Plants are at the trophic base of most ecosystems, embedded in a rich network of ecological interactions in which they evolved. While their limited range and speed of motion precludes animal-typical behavior, plants are accomplished chemists, producing thousands of specialized metabolites which may function to convey information, or even to manipulate the physiology of other organisms. Plants' complex interactions and their underlying mechanisms are typically dissected within the controlled environments of growth chambers and glasshouses, but doing so introduces conditions alien to plants evolved in natural environments, such as being pot-bound, and receiving artificial light with a spectrum very different from sunlight...
May 17, 2018: Chemical Society Reviews
https://www.readbyqxmd.com/read/29768920/enzymatic-synthesis-of-the-ribosylated-glycyl-uridine-disaccharide-core-of-peptidyl-nucleoside-antibiotics
#19
Zheng Cui, Xiaodong Liu, Jonathan Overbay, Wenlong Cai, Xiachang Wang, Anke Lemke, Daniel Wiegmann, Giuliana Niro, Jon S Thorson, Christian Ducho, Steven G Van Lanen
Muraymycins belong to a family of nucleoside antibiotics that have a distinctive disaccharide core consisting of 5-amino-5-deoxyribofuranose (ADR) attached to 6'-N-alkyl-5'- C-glycyluridine (GlyU). Here we functionally assign and characterize six enzymes from the muraymycin biosynthetic pathway involved in the core assembly that starts from UMP. The biosynthesis is initiated by Mur16, a non-heme Fe(II)- and α-ketoglutarate-dependent dioxygenase, followed by four transferase enzymes-Mur17, a pyridoxal-5'-phosphate (PLP)-dependent transaldolase; Mur20, an aminotransferase; Mur26, a pyrimidine phosphorylase; and Mur18, a nucleotidylyltransferase...
May 17, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29768885/introduction-of-a-novel-nano-sized-n-sulfonated-br%C3%A3-nsted-acidic-homogeneous-catalyst-for-the-promotion-of-the-synthesis-of-2-h-indazolo-2-1-b-phthalazine-1-6-11-13-h-triones
#20
Omid Goli-Jolodar, Farhad Shirini, Mohadeseh Seddighi
In this research work, 4,4'-(butane-1,4-diyl)bis(1-sulfo-1,4-diazabicyclo[2.2.2]octane-1,4-diium) tetrachloride (NS-C4(DABCO-SO3H)2 · 4Cl) as a new nano-sized N-sulfonic acid was prepared and characterized using different types of spectroscopic methods including FT-IR, 1H NMR, 13C NMR, XRD, TGA and SEM analysis. This new reagent was efficiently used as catalyst for the promotion of the one-pot synthesis of 2H-indazolo[2,1-b]phthalazine-1,6,11(13H)-triones derivatives, as a class of biologically active compounds with important pharmaceutical properties, under solvent-free conditions during short reaction times in high yields...
January 1, 2018: Journal of Nanoscience and Nanotechnology
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