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https://www.readbyqxmd.com/read/28816405/synthesis-density-functional-theory-calculations-and-luminescence-of-lanthanide-complexes-with-2-6-bis-3-methoxybenzylidene-hydrazinocarbonyl-pyridine-schiff-base-ligand
#1
Ziyad A Taha, Taher S Ababneh, Ahmed K Hijazi, Qutaiba Abu-Salem, Abdulaziz M Ajlouni, Shroq Ebwany
A pyridine-diacylhydrazone Schiff base ligand, L = 2,6-bis[(3-methoxy benzylidene)hydrazinocarbonyl]pyridine was prepared and characterized by single crystal X-ray diffraction. Lanthanide complexes, Ln-L, {[LnL(NO3 )2 ]NO3 .xH2 O (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Er)} were prepared and characterized by elemental analysis, molar conductance, thermal analysis (TGA/DTGA), mass spectrometry (MS), Fourier transform infra-red (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. Ln-L complexes are isostructural with four binding sites provided by two nitro groups along with four coordination sites for L...
August 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28816046/rhodium-iii-catalyzed-c-h-activation-of-nitrones-and-annulative-coupling-with-nitroalkenes
#2
Dachang Bai, Qingqian Jia, Teng Xu, Qiuqiu Zhang, Fen Wu, Chaorui Ma, Bingxian Liu, Junbiao Chang, Xingwei Li
Rh(III)-catalyzed synthesis of nitro-functionalized indenes has been realized via C-H activation of arylnitrones and annulation with nitroolefins. The reaction proceeded in moderate to high yields with good functional group tolerance under ambient atmosphere.
August 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28815720/pharmacological-evidence-of-involvement-of-nitric-oxide-pathway-in-anti-pruritic-effects-of-sumatriptan-in-chloroquine-induced-scratching-in-mice
#3
Nazgol-Sadat Haddadi, Sattar Ostadhadi, Saeed Shakiba, Khashayar Afshari, Nastaran Rahimi, Arash Foroutan, Ahmad-Reza Dehpour
Chloroquine (CQ) induces histamine-independent itch in human and mice. We recently reported the role of intradermal nitric oxide (NO)/ cyclic guanosine monophosphate (cGMP) pathway in CQ-evoked scratching in mice. Chloroquine stimulates neuronal nitric oxide synthase (nNOS) activity to over-producing NO in the skin. Sumatriptan, a 5-hydroxytryptamine 1b/1d receptors (5-HTR1b/1d) agonist, is involved in pain and used to treat migraine and cluster headaches. According to previous studies, sumatriptan inhibits NOS activity...
August 16, 2017: Fundamental & Clinical Pharmacology
https://www.readbyqxmd.com/read/28813436/enhancement-of-the-production-of-l-glutaminase-an-anticancer-enzyme-from-aeromonas-veronii-by-adaptive-and-induced-mutation-techniques
#4
S Aravinth Vijay Jesuraj, Md Moklesur Rahman Sarker, Long Chiau Ming, S Marylin Jeya Praya, M Ravikumar, Wong Tin Wui
Microbial anti-cancer enzymes have been proven to be effective and economical agents for cancer treatment. Aeromonas veronii has been identified as a microorganism with the potential to produce L-glutaminase, an anticancer agent effective against acute lymphocytic leukaemia. In this study, a selective medium of Aeromonas veronii was used to culture the microorganism. Strain improvement was done by adaptive and induced mutational techniques. A selective minimal agar media was incorporated for the growth of the strain which further supports adaptive mutation...
2017: PloS One
https://www.readbyqxmd.com/read/28810208/tungsten-doped-tio2-reduced-graphene-oxide-nano-composite-photocatalyst-for-degradation-of-phenol-a-system-to-reduce-surface%C3%A2-and-bulk-electron-hole-recombination
#5
Manisha Yadav, Asha Yadav, Rohan Fernandes, Yaksh Popat, Michele Orlandi, Alpa Dashora, D C Kothari, Antonio Miotello, B L Ahuja, Nainesh Patel
Recombination of photogenerated charges is the main factor affecting the photocatalytic activity of TiO2. Here, we report a combined strategy of suppressing both the bulk as well as the surface recombination processes by doping TiO2 with tungsten and forming a nanocomposite with reduced graphene oxide (rGO), respectively. Sol-gel method was used to dope and optimize the concentration of W in TiO2 powder. UV-Vis, XPS, PL and time resolved PL spectra along with DFT calculations indicate that W(6+) in TiO2 lattice creates an impurity level just below the conduction band of TiO2 to act as a trapping site of electrons, which causes to improve the lifetime of the photo-generated charges...
August 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28809982/coordination-polymer-derived-nano-sized-zinc-ferrite-with-excellent-performance-in-nitro-explosive-detection
#6
Debal Kanti Singha, Partha Mahata
Herein, a mixed metal coordination polymer, {(H2pip)[Zn1/3Fe2/3(pydc-2,5)2(H2O)]·2H2O} 1 {where H2pip = piperazinediium and pydc-2,5 = pyridine-2,5-dicarboxylate}, was successfully synthesized using a hydrothermal technique. To confirm the structure and phase purity of 1, single crystals of an isomorphous pure Fe compound, {(H2pip)[Fe(pydc-2,5)2(H2O)]·2H2O} 1a, were synthesized based on similar synthetic conditions. Single crystal X-ray data of 1a confirmed the one-dimensional anionic metal-organic coordination polymer hydrogen bonded with protonated piprazine (piperazinediium) and lattice water molecules...
August 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28809116/organoimido-polyoxometalate-nonlinear-optical-chromophores-a-structural-spectroscopic-and-computational-study
#7
Ahmed Al-Yasari, Nick Van Steerteghem, Hayleigh Kearns, Hani El Moll, Karen Faulds, Joseph A Wright, Bruce S Brunschwig, Koen Clays, John Fielden
Ten organoimido polyoxometalate (POM)-based chromophores have been synthesized and studied by hyper-Rayleigh scattering (HRS), Stark and Resonance Raman spectroscopies, and density functional theory (DFT) calculations. HRS β0 values for chromophores with resonance electron donors are significant (up to 139 × 10(-30) esu, ∼5 times greater than that of the DAS(+) cation), but systems with no donor, or the -NO2 acceptor show no activity, in some cases, despite large DFT-predicted β-values. In active systems with short (phenyl) π-bridges, β0 values comfortably exceed that of the purely organic structural analogue N,N-dimethyl-4-nitroaniline (DMPNA), and intrinsic β-values, β0/N(3/2) (where N is the number of bridge π-electrons) thus appear to break empirical performance limits (β0/N(3/2) vs λmax) for planar organic systems...
August 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28806073/transformation-among-aromatic-iodinated-disinfection-byproducts-in-the-presence-of-monochloramine-from-monoiodophenol-to-triiodophenol-and-diiodonitrophenol
#8
Tingting Gong, Yuxian Tao, Xiangru Zhang, Shaoyang Hu, Jinbao Yin, Qiming Xian, Jian Ma, Bin Xu
Aromatic iodinated disinfection byproducts (DBPs) are a newly identified category of highly toxic DBPs. Among the identified aromatic iodinated DBPs, 2,4,6-triiodophenol and 2,6-diiodo-4-nitro- phenol have shown relatively widespread occurrence and high toxicity. In this study, we found that 4-iodophenol underwent transformation to form 2,4,6-triiodophenol and 2,6-diiodo-4-nitrophenol in the presence of monochloramine. The transformation pathways were investigated, the decomposition kinetics of 4-iodophenol and the formation of 2,4,6-triiodophenol and 2,6-diiodo-4-nitrophenol were studied, the factors affecting the transformation were examined, the toxicity change during the transformation was evaluated, and the occurrence of the proposed transformation pathways during chloramination of source water was verified...
August 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28803055/aristolochic-acid-and-its-derivatives-as-inhibitors-of-snake-venom-l-amino-acid-oxidase
#9
Payel Bhattacharjee, Indrani Bera, Subhamoy Chakraborty, Nanda Ghoshal, Debasish Bhattacharyya
Snake venom L-amino acid oxidase (LAAO) exerts toxicity by inducing hemorrhage, pneumorrhagia, pulmonary edema, cardiac edema, liver cell necrosis etc. Being well conserved, inhibitors of the enzyme may be synthesized using the template of the substrate, substrate binding site and features of the catalytic site of the enzyme. Previous findings showed that aristolochic acid (AA), a major constituent of Aristolochia indica, inhibits Russell's viper venom LAAO enzyme activity since, AA interacts with DNA and causes genotoxicity, derivatives of this compound were synthesized by replacing the nitro group to reduce toxicity while retaining the inhibitory potency...
August 9, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28802992/effects-of-humic-acid-and-heavy-metals-on-the-sorption-of-polar-and-apolar-organic-pollutants-onto-biochars
#10
Fei Wang, Hongwen Sun, Xinhao Ren, Yarui Liu, Hongkai Zhu, Peng Zhang, Chao Ren
The effects of humic acid (HA) and heavy metals (Cu(2+) and Ag(+)) on the sorption of polar and apolar organic pollutants onto biochars that were produced at temperatures of 200 °C (BC200) and 700 °C (BC700) were studied. Due to the plentiful polar functional groups on BC200, cationic propranolol exhibited higher levels of sorption than naphthalene on BC200 while naphthalene and propranolol showed similar sorption capacities on BC700. HA changed the characteristics of biochars and generally inhibited the sorption of target organic pollutants on biochars; however, enhancement occurred in some cases depending on the pollutants involved and their concentrations, biochars used and the addition sequences and concentrations of HA...
August 10, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28802244/detoxification-of-diphenyl-ether-herbicide-lactofen-by-bacillus-sp-za-and-enantioselective-characteristics-of-an-esterase-gene-lace
#11
Jing Zhang, Luyao Lu, Feng Chen, Lingling Chen, Jingang Yin, Xing Huang
A bacterial strain Za capable of degrading diphenyl ether herbicide lactofen was isolated and identified as Bacillus sp. This strain could degrade 94.8% of 50mgL(-1) lactofen after 4days of inoculation in flasks. It was revealed that lactofen was initially hydrolyzed to desethyl lactofen, which was further transformed to acifluorfen, followed by the reduction of the nitro group to yield aminoacifluorfen. The phytotoxicity of the transformed product aminoacifluorfen to maize was decreased significantly compared with the lactofen...
August 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28801886/effects-of-3-nitro-1-2-4-triazol-5-one-on-survival-growth-and-metamorphosis-in-the-northern-leopard-frog-lithobates-pipiens
#12
David A Pillard, William S Eck, Mark S Johnson, Stephanie Packard
New explosive formulations are being developed to be less sensitive to impact and inadvertent explosion, increasing safety for the warfighter. Since testing and training make environmental releases imminent, the toxicity of 3-nitro-1,2,4-triazol-5-one (NTO), a component of Insensitive Munitions eXplosive (IMX) formulations, was assessed in a one-generation study to the northern leopard frog (Lithobates ( = Rana) pipiens). Because NTO in water creates acidic conditions, acute studies were conducted with non-pH-adjusted NTO, while a long-term (70-d) study was conducted with neutralized NTO...
August 11, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28797164/universal-surface-engineering-of-transition-metals-for-superior-electrocatalytic-hydrogen-evolution-in-neutral-water
#13
Bo You, Xuan Liu, Guoxiang Hu, Sheraz Gul, Junko Yano, De-En Jiang, Yujie Sun
The development of low-cost hybrid water splitting-biosynthetic systems that mimic natural photosynthesis to achieve solar-to-chemical conversion is of great promise for future energy demands, but often limited by the kinetically sluggish H2 evolu-tion reaction (HER) on the surface of nonprecious transition metal catalysts in neutral media. It is thus highly desirable to rationally tailor the reaction interface to boost the neutral HER catalytic kinetics. Herein, we report a general surface nitro-gen modification of diverse transition metals (e...
August 10, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28791396/oxidored-nitro-domain-containing-protein-1-promotes-liver-fibrosis-by-activating-the-wnt-%C3%AE-catenin-signaling-pathway-in%C3%A2-vitro
#14
Tianxin Xiang, Shouhua Zhang, Na Cheng, Shanfei Ge, Jiangxiong Wen, Juhua Xiao, Xiaoping Wu
Hepatic fibrosis is a characteristic of various types of chronic liver diseases, and may further develop into liver cirrhosis and liver cancer. Oxidored‑nitro domain‑containing protein 1 (NOR1) expression levels are greater in hepatitis, cirrhosis and hepatocellular carcinoma samples compared with from normal liver samples. However, the importance of NOR1 in liver fibrosis remains to be elucidated. The present study aimed to investigate the effect of NOR1 on the proliferation and matrix expression of human hepatic stellate cells (HSCs) in vitro...
August 4, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28790461/anti-colon-cancer-effect-of-caffeic-acid-p-nitro-phenethyl-ester-in-vitro-and-in-vivo-and-detection-of-its-metabolites
#15
Hao Tang, Xiaofang Yao, Cong Yao, Xiaoyan Zhao, Hua Zuo, Zhubo Li
Caffeic acid phenethyl ester (CAPE), extracted from propolis, was proven to inhibit colon cancer. Caffeic acid p-nitro-phenethyl ester (CAPE-pNO2), a derivative of CAPE, was determined to be an anti-platelet agent and a protector of myocardial ischaemia with more potent effects. In the present study, CAPE-pNO2 showed stronger cytotoxic activity than CAPE. We revealed interactions between CAPE-pNO2 and experimental cells. CAPE-pNO2 induced apoptosis in HT-29 cells by up-regulating P53, cleaved-caspase-3, Bax, P38 and CytoC; CAPE-pNO2 also up-regulated P21(Cip1) and P27(Kip1) and down-regulated CDK2 and c-Myc to promote cell cycle arrest in G0/G1...
August 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28789912/facile-alkylation-of-4-nitrobenzotriazole-and-its-platelet-aggregation-inhibitory-activity
#16
Dhandeep Singh, Om Silakari
We explored the facile alkylation of 4-nitrobenzotriazole under basic conditions and the synthesized derivatives were tested for their potential ADP induced platelet aggregation inhibition activity in comparison with standard drug ticagrelor (selective P2Y12 inhibitor). The nitro group at 4-position is highly activating toward alkylation reactions (under strong basic conditions) and resulted in formation of degradation product like 3-nitrobenzene-1,2-diamine which make isolation of alkyl products very difficult...
July 27, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28782796/combination-of-traditional-mutation-and-metabolic-engineering-to-enhance-ansamitocin-p-3-production-in-actinosynnema-pretiosum
#17
Zhi-Qiang Du, Yuan Zhang, Zhi-Gang Qian, Han Xiao, Jian-Jiang Zhong
Ansamitocin P-3 (AP-3) is a maytansinoid with its most compelling antitumor activity, however, the low production titer of AP-3 greatly restricts its wide commercial application. In this work, a combinatorial approach including random mutation and metabolic engineering was conducted to enhance AP-3 biosynthesis in Actinosynnema pretiosum. Firstly, a mutant strain M was isolated by N-methyl-N'-nitro-N-nitrosoguanidine mutation, which could produce AP-3 almost 3-fold that of wild type in 48 deep-well plates. Then, by overexpressing key biosynthetic genes asmUdpg and asm13-17 in the M strain, a further 60% increase of AP-3 production in 250-mL shake flasks was achieved in the engineered strain M-asmUdpg:asm13-17 compared to the M strain, and its maximum AP-3 production reached 582...
August 7, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28782772/green-tea-infusion-protects-against-alcoholic-liver-injury-by-attenuating-inflammation-and-regulating-the-pi3k-akt-enos-pathway-in-c57bl-6-mice
#18
Dongxu Wang, Qiang Gao, Taotao Wang, Guangshan Zhao, Frank Qian, Jinbao Huang, Haisong Wang, Xin Zhang, Yijun Wang
Alcohol intake is a major risk factor for the pathogenesis of alcoholic liver diseases. Accumulating evidence suggests that green tea protects against alcoholic liver injury; however, the underlying mechanisms remain unclear. The present study investigated the role of endothelial nitric oxide synthase (eNOS) in the protective effects of green tea against alcohol-induced liver injury and inflammation. Ethanol was intragastrically administered to male C57BL/6 mice once a day, and the mice were allowed free access to green tea infusion or water for two weeks...
August 7, 2017: Food & Function
https://www.readbyqxmd.com/read/28782186/application-of-the-pentafluorosulfanyl-group-as-a-bioisosteric-replacement
#19
Munia F Sowaileh, Robert Alan Hazlitt, David A Colby
The success of fluorinated molecules in drug design has led medicinal chemists to search for new fluorine-containing substituents. A major recently developed group is the pentafluorosulfanyl group. This group is stable under physiological conditions and displays unique physical and chemical properties. Currently, few synthetic methods exist that install the SF5 group, yet efforts to integrate this group into lead optimization continue unabated. Typically, the SF5 group has been used as a replacement for a trifluoromethyl, a tert-butyl, a halogen, or a nitro group...
August 7, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28782150/mri-assessment-of-coronary-microvascular-endothelial-nitric-oxide-synthase-function-using-myocardial-t1-mapping
#20
Sophia X Cui, Frederick H Epstein
PURPOSE: Endothelial nitric oxide synthase (eNOS) plays a central role in regulating vascular tone, blood flow, and microvascular permeability. Endothelial dysfunction, including eNOS dysfunction, is an early biomarker of vascular disease. This study aimed to show that myocardial T1 mapping during nitric oxide synthase (NOS) inhibition could assess coronary microvascular eNOS function. METHODS: Wild-type mice, eNOS(-/-) mice, and wild-type mice fed a high-fat diet underwent T1 mapping at baseline and for 20 min after injection of N(G) -nitro-L-arginine methyl ester (LNAME), a NOS inhibitor...
August 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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