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Amy D Lynes, Chris S Hawes, Kevin Byrne, Wolfgang Schmitt, Thorfinnur Gunnlaugsson
Flexible benzene-1,3,5-tricarboxamides (BTAs), organic species well-known for their tendencies to form functional soft-materials by virtue of their complementary hydrogen bonding, are explored as structurally reinforcing supramolecular building blocks in porous coordination polymers. We report the synthesis and characterisation of two related, carboxylate-terminated BTA derivatives, and the structure and functionality of their polymeric Cd(ii) complexes. The polycarboxylate ligand benzene-1,3,5-tricarboxamide tris(phenylacetic acid) H3L1 was prepared, and the analogous trimethyl benzene-1,3,5-tricarboxamide tris acetate Me3L2 was prepared and its single crystal structure elucidated...
March 22, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Tonghao Yang, Xing Fan, Xiaopeng Zhao, Wei Yu
This paper reports that tertiary α-azidyl phenyl ketones can be transformed into enamides by treatment with FeBr2 at elevated temperature in DMF. The reaction proceeds via 1,2-benzoyl migration from α-carbon to the nitrogen atom, accompanied by expulsion of a nitrogen molecule. This protocol is suitable for the synthesis of N-(cyclopent-1-en-1-yl)benzamides, N-(cyclohex-1-en-1-yl)benzamides, and N-benzoyl-α-methyl enamines and provides a convenient approach toward isoquinolones.
March 21, 2018: Organic Letters
Hyun-Chul Kim, Seong Huh, Do Nam Lee, Youngmee Kim
Lewis basic heteroatoms orderly located inside the well-defined channels of metal-organic frameworks (MOFs) are potentially ideal active sites for selective gas sorption and catalysis. To develop functional MOFs with Lewis basic sites inside channels, a new C2h-symmetric dicarboxylate-based bridging ligand, 3,3'-(pyrazine-2,5-diyl)dibenzoic acid (3,3'-PDBA), was prepared by a Suzuki coupling reaction. Subsequently, two new Zn-MOFs containing the C2h-symmetric 3,3'-PDBA bridging ligand and two different bis(pyridyl)-based pillars, 1,2-bis(4-pyridyl)ethane (bpa) or 1,2-bis(4-pyridyl)ethylene (bpe), were prepared through a thermal reaction in N,N-dimethylformamide (DMF)...
March 21, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Min Liu, Xu-Feng Yang, Hai-Bin Zhu, Bao-Sheng Di, Yue Zhao
A Keggin-type polyoxometalate (POM)-templated metal-organic framework, [Cd(TTPB-4)(DMF)3]4[PMo12O40]2[HPMo12O40]·6DMF·4H2O (1), based on a newly designed linker of TTPB-4 [TTPB-4 = 1,3,5-tris(4-(4H-1,2,4-triazol-4-yl)phenyl)benzene], has been hydrothermally synthesized and characterized using IR, XRD, TGA, UV-Vis and photoluminescence spectra. Single-crystal X-ray crystallography reveals that 1 represents a unique POM-templated four-fold interpenetrated 3-D coordination network. The POM-templated MOF of 1 exhibits strong chemical stability that can withstand aqueous solutions of various pH-values (2-10)...
March 21, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Tomasz Tański, Wiktor Matysiak
The purpose of this paper was to produce SiO₂ and TiO₂ nanowires via the electrospinning process from a polyvinylpyrrolidone (PVP)/Tetraethyl orthosilicate (TEOS)/Titanium (IV) butoxide (TNBT)/dimethylformamide (DMF) and ethanol (EtOH) solution. The as-obtained nanofibers were calcined at temperatures ranging from 400 °C to 600 °C in order to remove the organic phase. The one-dimensional ceramic nanostructures were studied using a scanning electron microscope (SEM) and a transmission electron microscope (TEM) to analyze the influence of the used temperature on the morphology and structures of the obtained ceramic nanomaterials...
March 20, 2018: Nanomaterials
Dirk Ziebolz, David Douglas, Donya Douglas, Jan Schmickler, Daniel Patschan, Gerhard A Müller, Rainer Haak, Jana Schmidt, Gerhard Schmalz, Susann Patschan
OBJECTIVE: Recent literature reveals worse periodontal health condition in ankylosing spondylitis (AS). However, roles of AS-related parameters, periodontal condition, and their association appear unclear. This cross-sectional study aimed at investigating dental and periodontal health as well as potentially periodontal pathogenic bacteria in patients with AS compared to healthy control subjects (HC). METHODS: Dental examination comprised dental findings (DMF-T), periodontal probing depth (PPD), bleeding on probing, clinical attachment loss (CAL), papillary bleeding index, and microbiological analysis based on polymerase chain reaction of selected potentially periodontal pathogenic bacteria...
March 20, 2018: Rheumatology International
Qiushi Sun, Shuo Yao, Bing Liu, Xinyao Liu, Guanghua Li, Xiaoyang Liu, Yunling Liu
A novel polyhedron-based metal-organic framework [(CH3)2NH2]2[Zn3(TADIPA)2(DMF)2]·4DMF (JLU-Liu40), which possesses three types of cages with different shapes and sizes, has been successfully synthesized. The framework of JLU-Liu40 is constructed by two inorganic secondary building units (SBUs) of 4-connected square binuclear Zn-paddlewheel and 4-connected tetrahedron mononuclear Zn unit and one organic SBU, which has abundant Lewis basic sites (LBSs), and the framework can be simplified as a pair of 3-connected triangle geometries...
March 20, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Liming Wang, Herman S Overkleeft, Gijsbert A van der Marel, Jeroen D C Codée
The development of a general glycosylation method that allows for the stereoselective construction of glycosidic linkages is a tremendous challenge. Because of the differences in steric and electronic properties of the building blocks used the outcome of a glycosylation reaction can greatly vary when switching form one glycosyl donor-acceptor pair to another. We here report a strategy to install cis-glucosidic linkages in a fully stereoselective fashion that is under direct control of the reagents used to activate a singly type of donor building block...
March 19, 2018: Journal of the American Chemical Society
Wataru Ochiai, Hiroko Kobayashi, Satoshi Kitaoka, Mayumi Kashiwada, Yuya Koyama, Saho Nakaishi, Tomomi Nagai, Masaki Aburada, Kiyoshi Sugiyama
5,7-Dimethoxyflavone (5,7-DMF), one of the major components of Kaempferia parviflora, has anti-obesity, anti-inflammatory, and antineoplastic effects. On the other hand, in vitro studies have reported that it directly inhibits the drug metabolizing enzyme family cytochrome P450 (CYP) 3As. In this study, its safety was evaluated from a pharmacokinetic point of view, based on daily ingestion of 5,7-DMF. Midazolam, a substrate of CYP3As, was orally administered to mice treated with 5,7-DMF for 10 days, and its pharmacokinetic properties were investigated...
March 17, 2018: Journal of Natural Medicines
Anna L Suominen, Sinikka Varsio, Sari Helminen, Anne Nordblad, Satu Lahti, Matti Knuuttila
OBJECTIVE: We assessed dental and periodontal health in adults aged ≥30 years living in southern and northern Finland as part of the Health 2000/2011 Surveys (BRIF8901). MATERIAL AND METHODS: Clinical findings in 2000 (n = 2967) and 2011 (n = 1496) included the presence of teeth and number of teeth with caries, fillings, fractures or periodontal pockets. RESULTS: Edentulousness decreased in all age groups. The prevalence of those with no caries increased from 67% to 69% in men and from 80% to 85% in women, and of those with no periodontal pocketing from 26% to 30% in men and from 39% to 42% in women...
March 16, 2018: Acta Odontologica Scandinavica
Gerhard Schmalz, Donya Douglas, David Douglas, Susann Patschan, Daniel Patschan, Gerhard A Müller, Rainer Haak, Jan Schmickler, Dirk Ziebolz
BACKGROUND: The aim of this cross-sectional study was to investigate oral health-related quality of life (OHRQoL) in patients with ankylosing spondylitis (AS) and its association to oral health as well as AS specific parameters. METHODS: Patients with AS and a healthy control group (HC) were included and examined. The oral examination included decayed-, missing-, and filled-teeth index (DMF-T) as well as assessment of periodontal probing depth and clinical attachment loss to classify patients into healthy/mild, moderate, or severe periodontitis...
February 7, 2018: Clinical Oral Investigations
Amanpreet Kaur Jassal, Balkaran Singh Sran, Yan Suffren, Kevin Bernot, Fabrice Pointillart, Olivier Cador, Geeta Hundal
Single crystal diffraction studies reveal the formation of the following 10 new complexes of lighter Ln(iii) ions with general formulas {[Ln(μ2 -L1)3 ·(H2 O)2 ]·H2 O}n (Ln = Nd (1) and Eu (2)), [Nd(μ2 -L2)2 ·(CH3 COO)·(H2 O)2 ]n (3), [Ln2 (μ2 -L2)5 ·(L2)·(H2 O)4 ]n (Ln = Sm (4), Ce (5), and Pr (6)), [La2 (μ2 -L2)6 ·(H2 O)3 ·(DMF)]n (7) (DMF = dimethylformamide), [Ln(μ2 -L2)2 ·(L2)·(H2 O)3 ]2 (Ln = Eu (8) and Gd (9)) and [Gd(L2)·(CH3 COO)2 ·(H2 O)2 ]2 (10), where L1 and L2 are anions of 3,5- and 2,4-dinitrobenzoic acid, respectively...
March 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Guijun Chen, Xiaohua Liu, Sufen Li, Ming Dong, Dongyue Jiang
When a water droplet slides down a hydrophobic surface, a major energy it possesses is kinetic energy. However, people may ignore another important energy source: triboelectrification. To quantify and utilize triboelectrification energy, a phenomenon is presented in this study: one droplet slides down a tilted chip with a hydrophobic coating and patterned electrodes, triboelectrification happens and the induced charges are transferred to another horizontally placed chip with copper wires, on which another droplet is actuated by the transferred charges...
March 14, 2018: Lab on a Chip
In-Ja Kim, Heung-Soo Lee, Hyun-Jeong Ju, Ja-Young Na, Hyo-Won Oh
BACKGROUND: A recent study in Canada reported that vitamin D deficiency is associated with dental caries. Because Koreans have been reported to be deficient in vitamin D, we investigated the relationship between dental caries and reduced serum vitamin D levels in Korean children. The purpose of this study was to analyze the relationships between blood vitamin D [25(OH)D] concentrations and dental caries in the permanent dentition of Korean children. METHODS: Data were collected from the Korea National Health and Nutrition Examination Survey performed in 2008-2013...
March 13, 2018: BMC Oral Health
Junghyun Lee, Miran Hahm, Da-An Huh, Sang-Hoon Byeon
The purpose of this study was to classify hazards at an industrial level and evaluate the exposure risks of workers exposed to dimethylformamide (DMF) used as a solvent in the workplace and to determine industries that need priority measures in managing DMF exposure. We calculated hazard quotients at an industrial level. The exposure data of DMF in the workplace were obtained from the work environment monitoring program provided by the Korea Occupational Safety and Health Agency. The evaluation was conducted on textile manufacturing, leather manufacturing, chemical manufacturing, pharmaceutical manufacturing, and rubber manufacturing industries, which have many unit work sites handling DMF...
March 13, 2018: International Journal of Environmental Research and Public Health
George Vavougios, Sotirios G Zarogiannis, Triantafylos Doskas
Recent research has outlined that Dimethyl Fumarate (DMF) functions as a gene regulator via multiple pathways, critical among which is the NRF2 cytoprotective cascade. PARK7/DJ-1 is a multifunctional protein that acts as a redox sensor and effector of multiple cytoprotective pathways, including NRF2. Specifically, it prevents the association of NRF2 with its inhibitor KEAP1, allowing NRF2 to enter the nucleus and mediate cytoprotective and antioxidant cascades. It is our hypothesis that while the NRF2-KEAP1 inhibitory complex is reported the main pharmacological target for DMF's NRF dependent functions, no study to date has explored the effects of DMF on DJ-1's expression, and vice-versa, the possibility of a regulatory inadequacy in the upstream, oxidant-responsive DJ-1 activator of the NRF2 cascade...
February 26, 2018: Multiple Sclerosis and related Disorders
Stanley L Cohan, Harold Moses, Jonathan Calkwood, Carlo Tornatore, Chris LaGanke, Kyle E Smoot, Venkata Meka, Macaulay Okwuokenye, Christophe Hotermans, Jason P Mendoza, Monica K Mann, Leslie A Meltzer
BACKGROUND: Delayed-release dimethyl fumarate (DMF) may be a therapeutic option for patients with relapsing-remitting multiple sclerosis (RRMS) who are treated with natalizumab and require a change in therapy. However, there is limited information regarding predictors of favorable treatment outcomes in patients switching from natalizumab to DMF. Clinical practices and sequencing protocols vary. Herein, we present the clinical results, including annualized relapse rate (ARR) and risk of relapse, of a phase 4 retrospective observational study of patients with RRMS who switched from natalizumab to DMF in a community practice setting (STRATEGY)...
February 26, 2018: Multiple Sclerosis and related Disorders
Mariko Kita, Robert J Fox, Ralf Gold, Gavin Giovannoni, J Theodore Phillips, Sujata P Sarda, Jessica Kong, Vissia Viglietta, Sarah I Sheikh, Macaulay Okwuokenye, Ludwig Kappos
No abstract text is available yet for this article.
March 7, 2018: Clinical Therapeutics
Shenghai Guo, Fang Wang, Li Tao, Xinying Zhang, Xuesen Fan
A simple and practical procedure for the selective preparation of 3H-indol-3-one and indolo[1,2-c]quinazoline derivatives through copper-catalyzed aerobic oxygenation and intramolecular cyclization reactions of 2-(2-amidoaryl)-1H-indoles in the presence of acid has been disclosed. Interestingly, the reaction outcomes are exclusively dependent on the reaction medium employed. With DMF as the solvent, the amide moiety of indole substrates could act as an auxiliary to enable the indole's oxygenation reaction with molecular oxygen from air as the oxidant to give 3H-indol-3-one derivatives in a highly selective manner...
March 7, 2018: Journal of Organic Chemistry
Imtiaz Ali, Omar A Bamaga, Lassaad Gzara, M Bassyouni, M H Abdel-Aziz, M F Soliman, Enrico Drioli, Mohammed Albeirutty
In this work, PVDF homopolymer was blended with PVDF-co-HFP copolymer and studied in terms of morphology, porosity, pore size, hydrophobicity, permeability, and mechanical properties. Different solvents, namely N-Methyl-2 pyrrolidone (NMP), Tetrahydrofuran (THF), and Dimethylformamide (DMF) solvents, were used to fabricate blended PVDF flat sheet membranes without the introduction of any pore forming agent, through a non-solvent induced phase separation (NIPS) technique. Furthermore, the performance of the fabricated membranes was investigated for pressure and thermal driven applications...
March 5, 2018: Membranes
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