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https://www.readbyqxmd.com/read/28524863/br%C3%A3-nsted-acid-catalysed-enantioselective-construction-of-axially-chiral-arylquinazolinones
#1
Yong-Bin Wang, Sheng-Cai Zheng, Yu-Mei Hu, Bin Tan
The axially chiral arylquinazolinone acts as a privileged structural scaffold, which is present in a large number of natural products and biologically active compounds as well as in chiral ligands. However, a direct catalytic enantioselective approach to access optically pure arylquinazolinones has been underexplored. Here we show a general and efficient approach to access enantiomerically pure arylquinazolinones in one-pot fashion catalysed by chiral phosphoric acids. A variety of axially chiral arylquinazolinones were obtained in high yields with good to excellent enantioselectivities under mild condition...
May 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28524834/wild-type-p53-induced-phosphatase-1-deficiency-exacerbates-myocardial-infarction-induced-ischemic-injury
#2
Ke-Mei Liu, Hai-Hong Zhang, Ya-Nan Wang, Lian-Mei Wang, Hong-Yu Chen, Cai-Feng Long, Lian-Feng Zhang, Hong-Bing Zhang, Hong-Bing Yan
BACKGROUND: Myocardial infarction (MI) is a major disease burden. Wild-type p53-induced phosphatase 1 (Wip1) has been studied extensively in the context of cancer and the regulation of different types of stem cells, but the role of Wip1 in cardiac adaptation to MI is unknown. We investigated the significance of Wip1 in a mouse model of MI. METHODS: The study began in June 2014 and was completed in July 2016. We compared Wip1-knockout (Wip1-KO) mice and wild-type (WT) mice to determine changes in cardiac function and survival in response to MI...
June 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28524205/structure-and-luminescence-analyses-of-simultaneously-synthesised-lu1-xgdx-2o2s-tb-3-and-lu1-xgdx-2o3-tb-3
#3
Natalie Pasberg, Daniel den Engelsen, George R Fern, Paul G Harris, Terry G Ireland, Jack Silver
Herein we describe the synthesis and luminescence of nanosized (Lu1-y-xGdx)2O2S:Tby and (Lu1-y-xGdx)2O3:Tby phosphors with y = 0.1 mol% Tb(3+) and y = 2 mol% Tb(3+) and x ranging between 0 and 1. The concentration of Gd(3+) (x) was varied in steps of 0.1 (molar ratio Gd(3+)). The samples at 0.1 < x < 0.7 contained a mixture of (Lu1-xGdx)2O3:Tb(3+) and (Lu1-xGdx)2O2S:Tb(3+), while the samples at x = 0 contained only Lu2O3:Tb(3+). At 0.1 < x < 0.7 Lu2O2S:Tb(3+) and Gd2O2S:Tb(3+) did not form a solid solution, but rather crystallised into two slightly different hexagonal structures...
May 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28524195/enhanced-reactivity-and-selectivity-of-asymmetric-oxa-michael-addition-of-2-hydroxychalcones-in-carbon-confined-spaces
#4
Melad Shaikh, Kiran Kumar Atyam, Mahendra Sahu, Kalluri V S Ranganath
Carbon nanotubes (CNTs) are employed as nanoscale reaction vessels for the asymmetric oxa-Michael addition of 2'-hydroxychalcones. A systematic comparison of the catalytic activities of chiral phosphoric acid treated ferrite nanoparticles (chiral ferrites) has been studied for the synthesis of flavanones. Higher reactivity and selectivity with switching of enantiomers were observed when these chiral ferrites are inside the CNT channel.
May 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28521507/biosorption-of-chromium-vi-in-aqueous-solutions-by-chemically-modified-strychnine-tree-fruit-shell
#5
E Nakkeeran, N Selvaraju
Chromium(VI) removal from aqueous solution was performed using sulphuric and phosphoric acid activated Strychnine tree fruit shell (SSTFS and PSTFS) as biosorbents. Effect of various parameters such as adsorbent dose (0.02 - 0.1g/L), temperature (303 - 333K), agitation speed, solution pH (2-9), contact time & initial Cr (VI) concentration (50-250 mg/L) were studied for a batch adsorption system. The optimum pH range for Cr(VI) adsorption was determined as 2. Equilibrium adsorption data were analyzed with isotherm models and the Langmuir and Freundlich model got best fitted for SSTFS (R(2) value-0...
May 19, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28521244/cholecystokinin-protects-mouse-liver-against-ischemia-and-reperfusion-injury
#6
Ying Zhang, Jiali Zhu, Long Guo, Yun Zou, Fang Wang, Han Shao, Jinbao Li, Xiaoming Deng
BACKGROUND: Cholecystokinin (CCK), as a gastrointestinal hormone, has an important protective role against sepsis or LPS-induced endotoxic shock. We aim to address the role of CCK in hepatic ischemia followed by reperfusion (I/R) injury. MATERIALS AND METHODS: A murine model of 60min partial hepatic ischemia followed by 6h of reperfusion was used in this study. CCK and CCKAR Levels in blood and liver were detected at 3h, 6h, 12h and 24h after reperfusion. Then the mice were treated with CCK or proglumide, a nonspecific CCK-receptor (CCK-R) antagonist...
May 15, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28521227/start-up-and-operation-of-an-aerobic-granular-sludge-system-under-low-working-temperature-inoculated-with-cold-adapted-activated-sludge-from-finland
#7
Alejandro Gonzalez-Martinez, Barbara Muñoz-Palazon, Alejandro Rodriguez-Sanchez, Paula Maza-Márquez, Anna Mikola, Jesus Gonzalez-Lopez, Riku Vahala
An aerobic granular sludge system has been started-up and operated at 7°C temperature using cold-adapted activated sludge as inoculum. The system could form granular biomass due to batch operation allowing for just 5-3min of biomass sedimentation. Scanning electron microscopy showed that fungi helped in the granular biomass formation in the early stages of the granule formation. The removal performance of the system was of 92-95% in BOD5, 75-80% in COD, 70-76% in total nitrogen and 50-60% in total phosphorous...
May 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28518190/sequential-incorporation-of-metallic-cations-cd-2-and-hg-2-and-n-octylamine-into-titanium-phosphate-nanoparticles-and-their-subsequent-release-in-acid-media
#8
Javier Carrasco-Rodríguez, Daniel Martín-Yerga, Leoncio Garrido, Agustín Costa-García, Francisco J García Alonso
Titanium phosphate nanoparticles, TPNP, consisting of a NaTi2(PO4)3 core and a shell of hydrogen phosphate and dihydrogen phosphate of titanium, undergo fast hydrolysis in water releasing phosphoric acid. This reaction is inhibited in the presence of metallic ions like Cd(2+) or Hg(2+), which are able to replace the protons of the shell acid phosphates. The amount of the adsorbed metallic cations could be regulated using counterions of different basicity. The resulting nanoparticles also incorporate NH2(CH2)7CH3 (N-octylamine) at room temperature forming N-octylammonium/phosphate ion pairs, but it was found that at higher cation concentration inside the nanoparticle, a lower amount of amine was adsorbed...
May 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28513870/activation-of-the-nrf2-are-signaling-pathway-prevents-hyperphosphatemia-induced-vascular-calcification-by-inducing-autophagy-in-renal-vascular-smooth-muscle-cells
#9
Li Yao, Jian Wang, Bin-Yao Tian, Tian-Hua Xu, Zi-Tong Sheng
This study investigates the effect of nuclear factor erythroid 2-related factor 2-antioxidant response element (Nrf2-ARE) signaling pathway in vascular calcification (VC) via inducing Autophagy in renal vascular smooth muscle cells (VSMCs). VSMCs were assigned into six experimental groups: the normal control, high phosphorus, si-negative control (si-NC), Nrf2-siRNA, over-expressed Nrf2 and negative control (NC) groups. RT-PCR was applied to detect the mRNA expressions of the desired Nrf2-ARE signaling pathway-related genes (Nrf2, NQO-1, HO-1, γ-GCS)...
May 17, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28513512/effects-of-laser-etching-on-shear-bond-strengths-of-brackets-bonded-to-fluorosed-enamel
#10
R Nalcaci, B Temel, S Çokakoğlu, H Türkkahraman, S Üsümez
AIM: To evaluate the effects of laser etching on the shear bond strengths (SBS) and failure modes of brackets bonded to fluorosed enamel. MATERIALS AND METHODS: This in vitro study included 34 fluorosed and 34 nonfluorosed teeth. Teeth were divided into four subgroups according to the etching procedure: Group (A) normal enamel etched with 37% phosphoric acid for 15 s, Group (B) nonfluorosed enamel etched with erbium:yttrium aluminum garnet (Er: YAG) laser for 15 s, Group (C) fluorosed enamel etched with 37% phosphoric acid for 30 s, Group (D) fluorosed enamel etched with Er: YAG laser for 30 s...
May 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28509334/enantioselective-synthesis-of-tetrahydroquinolines-by-borrowing-hydrogen-methodology-cooperative-catalysis-by-an-achiral-iridacycle-and-a-chiral-phosphoric-acid
#11
Ching Si Lim, Thanh Truong Quach, Yu Zhao
We report herein the highly enantioselective synthesis of 2-substituted tetrahydroquinolines through borrowing hydrogen, a process recognized for its environmentally benign and atom-economical nature. The use of an achiral iridacycle complex in combination with a chiral phosphoric acid as catalysts was the key to the development of this highly efficient and enantioselective transformation.
May 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28508118/effects-of-aeration-on-metabolic-profiles-of-mortierella-alpina-during-the-production-of-arachidonic-acid
#12
Xin Zhang, Ling Jiang, Li-Ying Zhu, Qin-Ke Shen, Xiao-Jun Ji, He Huang, Hong-Man Zhang
To investigate the metabolic regulation against oxygen supply, comparative metabolomics was performed to explore the metabolic responses of Mortierella alpina in the process of arachidonic acid (ARA) production. More than 110 metabolites involved in Embden-Meyerhof-Parnas pathway, pentose phosphate pathway, tricarboxylic acid cycle, inositol phosphate metabolism, fatty acid biosynthesis, and amino acid metabolism were identified by gas chromatography-mass spectrometry. Samples at different aeration rates were clearly distinguished by principal components analysis and partial least squares analysis, indicating that oxygen supply had a profound effect on the metabolism of M...
May 15, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28507711/interfacial-engineering-of-renewable-metal-organic-framework-derived-honeycomb-like-nanoporous-aluminum-hydroxide-with-tunable-porosity
#13
Ye-Tang Pan, Lu Zhang, Xiaomin Zhao, De-Yi Wang
Novel honeycomb-like mesoporous aluminum hydroxide (pATH) was synthesized via a facile one-step reaction by employing ZIF-8 as a template. This self-decomposing template was removed automatically under acidic conditions without the need for any tedious or hazardous procedures. Meanwhile, the pore size of pATH was easily modulated by tuning the dimensions of the ZIF-8 polyhedrons. Of paramount importance was the fact that the dissolved ZIF-8 in solution was regenerated upon deprotonation of the ligand under mild alkali conditions, and was reused in the preparation of pATH, thus forming a delicate synthesis cycle...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28507582/decreased-activity-of-butyrylcholinesterase-in-blood-plasma-of-patients-with-chronic-obstructive-pulmonary-disease
#14
Paulina Sicinska, Bozena Bukowska, Aneta Pajak, Aneta Koceva-Chyla, Tadeusz Pietras, Piotr Nizinkowski, Paweł Gorski, Maria Koter-Michalak
INTRODUCTION: Butyrylcholinesterase (BChE) is involved in the metabolism of endogenous lipids and xenobiotics, such as esters of carboxylic or phosphoric acids. Butyrylcholinesterase activity is associated with both inflammation and oxidative stress. Changes in the activity of this enzyme have been observed in various diseases such as liver cirrhosis, diabetes, neurodegenerative disease and others. MATERIAL AND METHODS: The study involved 30 patients with chronic obstructive pulmonary disease (COPD) and 18 healthy subjects...
April 1, 2017: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/28507408/effect-of-dietary-supplementation-of-fermented-fish-silage-on-serum-biochemical-parameters-of-broiler-japanese-quails-coturnix-coturnix-japonica
#15
Sasmita Panda, Laxman Kumar Babu, Arun Kumar Panda, Tanuja S, Anurag Mohanty, Kuldeep Kumar Panigrahy, Pinaki Samal
AIM: The objective of this study was to evaluate the effect of feeding fermented fish silage (FFS) on serum biochemical parameters of Japanese quails (Coturnix coturnix japonica). MATERIALS AND METHODS: A total of 192, 7-day-old broiler Japanese quail chicks of either sex, were randomly distributed into four dietary treatments with four replicates in each group having 12 chicks in each replicate pen. The dietary treatments were T1 - Control diet, T2 - Diet containing 5% FFS, T3 - Diet containing 10% FFS, and T4 - Diet containing 15% FFS...
April 2017: Veterinary World
https://www.readbyqxmd.com/read/28506720/sunlight-activated-near-infrared-phosphorescence-as-a-viable-means-of-latent-fingermark-visualisation
#16
Roberto S P King, Daniel A Skros
The chromium-doped zinc gallogermanate, Zn3Ga2Ge2O10:0.5%Cr(3+), was prepared and modified for use as a near-infrared (NIR) luminescent fingerprint dusting powder. The optical properties of this material are illustrated and have been shown to offer versatility and promise in terms of overcoming troublesome backgrounds during latent fingermark examination and imaging. The highly fluorescent NIR emission of the powder allows inherently fluorescent and patterned substrate backgrounds to be mitigated, whilst the phosphorescent nature of the material allows all conceivable background interference to be removed, whilst also constituting the first reported use of a NIR phosphor for latent fingermark enhancement and imaging...
April 26, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28503901/thermoluminescence-properties-of-eu-doped-and-eu-dy-codoped-sr2-al2-sio7-phosphors
#17
Akhilesh Jadhaw, Vivek D Sonwane, Anubha S Gour, Piyush Jha
We report the thermoluminescence properties of Sr1.96 Al2 SiO7 :Eu0.04 and Sr1.92 Al2 SiO7 :Eu0.04 Dy0.04 phosphors. These phosphors were prepared by a high-temperature solid-state reaction method. The prepared phosphors were characterized by X-ray diffraction. A 254 nm source was used for ultraviolet (UV) irradiation and a (60) Co source was used for γ-irradiation. The effect of heating rate and UV-exposure were examined. The thermoluminescence temperature shifts to higher values with increasing heating rate and thermoluminescence intensity increases with increasing UV exposure time...
May 14, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28501335/obtaining-of-granular-fertilizers-based-on-ashes-from-combustion-of-waste-residues-and-ground-bones-using-phosphorous-solubilization-by-bacteria-bacillus-megaterium
#18
M Rolewicz, P Rusek, K Borowik
The article presents research results on obtaining phosphorus granulated fertilizers on the basis of microbiologically activated sewage sludge ashes, ground bones and dried blood from meat industry. Granulation tests were carried out using a laboratory pan granulator as well as on an experimental pilot plant. The aim of the studies was to select the proper composition of the mixture of raw materials and binding agents to obtain granulated fertilizers from waste materials such as MSSA and MBM and bacteria lyophilisate...
May 10, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28500842/ppa1-regulates-tumor-malignant-potential-and-clinical-outcome-of-colon-adenocarcinoma-through-jnk-pathways
#19
Ping Wang, Yi Zhou, Qi Mei, Jing Zhao, Liu Huang, Qiang Fu
Colorectal cancer (CRC) represents one of the most prevalent malignancies and the third leading cause of cancer death worldwide. Inorganic pyrophosphatase (PPA1) is an enzyme that catalyzes the hydrolysis of pyrophosphate to inorganic phosphate, therefore participates in the energy metabolism. Proteomic studies have demonstrated the up-regulated expression of PPA1 in various tumors, however, its expression pattern in CRC hasn't been reported. In the current study, we used RT-qCR, Western Blot and immunohistochemical (IHC) staining to explore the expression of PPA1 in 113 paired colon cancer tissues and adjacent normal tissues, which revealed that PPA1 was correlated with lymph node metastasis...
April 24, 2017: Oncotarget
https://www.readbyqxmd.com/read/28500630/e2f-is-involved-in-radioresistance-of-carbon-ion-induced-apoptosis-via-bax-caspase-3-signal-pathway-in-human-hepatoma-cell
#20
Xie Yi, S I Jing, Wang Yu-Pei, L I Hong-Yan, D I Cui-Xia, Yan Jun-Fang, Y E Yan-Cheng, Zhang Yan-Shan, Zhang Hong
Deletion of p53, most common genetic alteration, is observed in human tumors and reported to lead to improve in cell radioresistance. Heavy-ion irradiation (IR) could induce p53-/- cancer cells apoptosis. However, little is known regarding the molecular mechanism in this type of cell apoptosis. The present studies have focused on mechanisms state of signaling pathways as an activator of the cell fate decisions induced by heavy ion IR without p53. Carbon ion IR could induce up-regulation of E2F1 expression in cancer cells...
May 13, 2017: Journal of Cellular Physiology
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