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https://www.readbyqxmd.com/read/28231656/-acute-effect-of-ambient-air-pollution-on-small-airway-lung-functions-among-school-children-in-shanghai
#1
L J Zhang, C Y Guo, H H Xu, D Xu, X B Shen, X Y Du, M H Zhang, J G Tan, J H Zhang, C Y Dong, H L Qian, Y W Shi, M Z Pan, X D Zhou
Objective: To study the acute effects of compound ambient air pollution on small airway lung functions among school children in Shanghai. Method: A longitudinal survey on lung functions was conducted among 233 school-children from three schools (A, B and C, located in innerring, mid-ring and outer-ring areas). Lung function test was performed once a week for 3 times respectively, among children in school A and B in Dec. 2013 and in school C in Dec. 2014. The fourth lung function test was tested in Jun. 2014 and May 2015 in the respective schools...
February 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28231521/therapeutic-journey-of-2-4-thiazolidinediones-as-a-versatile-scaffold-an-insight-into-structure-activity-relationship
#2
REVIEW
Mohd Javed Naim, Md Jahangir Alam, Shujauddin Ahmad, Farah Nawaz, Neelima Shrivastava, Meeta Sahu, Ozair Alam
Thiazolidinedione is an important heterocyclic ring system, a pharmacophore and a privileged scaffold in medicinal chemistry; is a derivative of thiazolidine ring which came into existence for its role as antihyperglycemic agent and a specific ligand of PPAR's (Peroxisome proliferator activated receptor). Exhaustive research has led to determination of its vast biological profile with wide range of therapeutic applications. This review covers recent pharmacological advancements of thiazolidinedione moiety along with structure activity relationship so as to provide better correlation among different structures and their receptor interactions...
February 20, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28231498/bone-specific-poly-ethylene-sodium-phosphate-bearing-biodegradable-nanoparticles
#3
Yuya Hirano, Yasuhiko Iwasaki
Chemotherapy is the most reliable treatment for osteoporosis and osseous metastases. To facilitate better drug delivery for bone treatments, a novel preparation of polymeric nanoparticles with high affinity to bone has been prepared. Two-step synthesis of cholesteryl-functionalized poly(ethylene sodium phosphate) (Ch-PEPn·Na) was performed via ring-opening polymerization of cyclic phosphoesters and the demethylation. The molecular weight of Ch-PEPn·Na could be well controlled by changing the ratio of cholesterol and cyclic phosphoesters...
February 16, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28230910/adhesives-for-bonded-molar-tubes-during-fixed-brace-treatment
#4
REVIEW
Declan T Millett, Nicky A Mandall, Rye Cr Mattick, Joy Hickman, Anne-Marie Glenny
BACKGROUND: Orthodontic treatment involves using fixed or removable appliances (dental braces) to correct the positions of teeth. The success of a fixed appliance depends partly on the metal attachments (brackets and bands) being glued to the teeth so that they do not become detached during treatment. Brackets (metal squares) are usually attached to teeth other than molars, where bands (metal rings that go round each tooth) are more commonly used. Orthodontic tubes (stainless steel tubes that allow wires to pass through them), are typically welded to bands but they may also be glued directly (bonded) to molars...
February 23, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28230827/astaxanthin-modifies-clastogenic-effects-of-ionizing-radiation-in-vitro-in-peripheral-blood-lymphocytes-of-the-persons-recovered-from-acute-radiation-sickness
#5
D А Kurinnyi, S R Rushkovsky, O B Dybska, G V Dubrovina, M А Pilinska
AIM: To assess radioprotective activity of astaxanthin toward radiation-induced in vitro cytogenetic effects in human peripheral blood lymphocytes (PBL). MATERIALS AND METHODS: PBL from the cleanup workers exposed to ionizing radiation at high doses in 1986 during accident on Chornobyl nuclear power plant and who were diagnosed with acute radiation sickness of the first and second degrees, were cultured in vitro. Astaxanthin was added into the culture medium at a final concentration of 20...
December 2016: Experimental Oncology
https://www.readbyqxmd.com/read/28230803/one-pot-conversion-of-epoxidized-soybean-oil-eso-into-soy-based-polyurethanes-by-mocl%C3%A2-o%C3%A2-catalysis
#6
Vincenzo Pantone, Cosimo Annese, Caterina Fusco, Paola Fini, Angelo Nacci, Antonella Russo, Lucia D'Accolti
An innovative and eco-friendly one-pot synthesis of bio-based polyurethanes is proposed via the epoxy-ring opening of epoxidized soybean oil (ESO) with methanol, followed by the reaction of methoxy bio-polyols intermediates with 2,6-tolyl-diisocyanate (TDI). Both synthetic steps, methanolysis and polyurethane linkage formation, are promoted by a unique catalyst, molybdenum(VI) dichloride dioxide (MoCl₂O₂), which makes this procedure an efficient, cost-effective, and environmentally safer method amenable to industrial scale-up...
February 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28230375/three-component-coupling-of-triflyloxy-substituted-benzocyclobutenones-organolithium-reagents-and-arynophiles-promoted-by-generation-of-aryne-via-carbon-carbon-bond-cleavage
#7
Keisuke Uchida, Suguru Yoshida, Takamitsu Hosoya
Treatment of benzocyclobutenones bearing a triflyloxy group adjacent to the four-membered ring with organolithium reagents in the presence of arynophiles efficiently affords three-component coupled α-arylketones. Mechanistic studies indicate that the reaction is promoted by generation of the aryne via carbon-carbon bond cleavage of a benzocyclobutenoxide intermediate, which led us to find a fluoride-mediated aryne generation method from triflyloxy-substituted benzocyclobutenone silyl acetal precursors.
February 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28230082/tubz-filament-assembly-dynamics-requires-the-flexible-c-terminal-tail
#8
Maria E Fuentes-Pérez, Rafael Núñez-Ramírez, Alejandro Martín-González, David Juan-Rodríguez, Oscar Llorca, Fernando Moreno-Herrero, Maria A Oliva
Cytomotive filaments are essential for the spatial organization in cells, showing a dynamic behavior based on nucleotide hydrolysis. TubZ is a tubulin-like protein that functions in extrachromosomal DNA movement within bacteria. TubZ filaments grow in a helical fashion following treadmilling or dynamic instability, although the underlying mechanism is unclear. We have unraveled the molecular basis for filament assembly and dynamics combining electron and atomic force microscopy and biochemical analyses. Our findings suggest that GTP caps retain the filament helical structure and hydrolysis triggers filament stiffening upon disassembly...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28229941/dual-high-resolution-inhibition-profiling-and-hplc-hrms-spe-nmr-analysis-for-identification-of-%C3%AE-glucosidase-and-radical-scavenging-inhibitors-in-solanum-americanum-mill
#9
Eder L Silva, Rita C Almeida-Lafetá, Ricardo M Borges, Dan Staerk
Solanum americanum is one of the most prominent species used to treat type 2 diabetes in Guatemala. In our ongoing efforts to find antidiabetic and antioxidative compounds from natural sources, an ethyl acetate extract of this medicinal herb was investigated using dual high-resolution α-glucosidase/radical scavenging inhibition profiling. The high-resolution biochromatograms obtained by this technique were used to target subsequent structural elucidation by HPLC-HRMS-SPE-NMR analysis towards the bioactive constituents...
February 13, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28229932/csn5-jab1-suppresses-the-wnt-inhibitor-dkk1-in-colorectal-cancer-cells
#10
Sandra Jumpertz, Thomas Hennes, Yaw Asare, Anke K Schütz, Jürgen Bernhagen
The COP9 signalosome (CSN) is a multi-protein complex that is highly conserved in eukaryotes. Due to its regulatory impact on processes such as cell cycle, DNA damage response and apoptosis, the CSN is essential for mammalian cells. One of the best-studied functions of the CSN is the deNEDDylation of cullin-RING ligases (CRLs) via its catalytically active subunit CSN5/JAB1, thereby triggering the degradation of various target proteins. CSN5 was found to be overexpressed in many human cancer entities, including colon adenocarcinoma...
February 13, 2017: Cellular Signalling
https://www.readbyqxmd.com/read/28229627/moderate-hypothermia-attenuates-%C3%AE-1-adrenoceptor-mediated-contraction-in-human-varicose-spermatic-vein-the-role-of-nitric-oxide-short-communication
#11
K E Nurullahoglu-Atalik, A Cenker
The effects of moderate hypothermia (28 °C) on the response of human varicose spermatic vein to α1-adrenoceptor agonist phenylephrine and the role of endothelial nitric oxide (NO) in these effects were studied. Concentration-response curves for phenylephrine (10(-9) to 3 × 10(-4) M) were recorded in rings with and without endothelium at 37 and 28 °C. To further analyze the role of NO, in the response to phenylephrine during hypothermia, the effects of this agonist in the presence of N(G)-nitro-L-arginine methyl ester (10(-4) M) were also determined...
December 2016: Physiol Int
https://www.readbyqxmd.com/read/28229597/molecular-seesaw-intricate-dynamics-and-versatile-chemistry-of-heteroaromatics-on-metal-surfaces
#12
Sergey N Filimonov, Wei Liu, Alexandre Tkatchenko
The design of novel elementary surface processes is important for applications in catalysis, single-molecule junctions, molecular sensors, switches and surface mounted molecular machines. Here we demonstrate by van der Waals inclusive density functional theory calculations that a small and relatively simple heteroaromatic compound s-triazine (C$_3$H$_3$N$_3$) unexpectedly possesses five metastable states when adsorbed on the Pt(111) surface. This diversity of the adsorption states stems from an interplay between versatile molecule/surface chemical bonding and van der Waals interactions and from ``softening'' of the aromatic ring by nitrogen substitution, which makes folding of the aromatic ring energetically much less demanding as compared to benzene...
February 23, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28229491/osnla1-a-ring-type-ubiquitin-ligase-maintains-phosphate-homeostasis-in-oryza-sativa-via-degradation-of-phosphate-transporters
#13
Wenhao Yue, Yinghui Ying, Chuang Wang, Yang Zhao, Changhe Dong, James Whelan, Huixia Shou
Inorganic phosphate (Pi) transporters (PTs) play vital roles in Pi uptake and translocation in plants. Under Pi sufficient conditions, PTs are degraded to prevent excess Pi accumulation. The mechanisms targeting PTs for degradation are not fully elucidated. In this study, we found that the Oryza sativa (rice) ortholog of Arabidopsis thaliana Nitrogen Limitation Adaptation (NLA), OsNLA1 protein, a RING-type E3 ubiquitin-ligase, was predominantly localized in the plasma membrane, and could interact with rice phosphate transporters OsPT2 and OsPT8...
February 23, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28229482/total-synthesis-and-structural-revision-of-clavilactone%C3%A2-d
#14
Ken-Ichi Takao, Ryuichi Nemoto, Kento Mori, Ayumi Namba, Keisuke Yoshida, Akihiro Ogura
A structural revision of clavilactone D, a potent inhibitor of protein tyrosine kinases, was achieved by total syntheses of two newly proposed structures. The syntheses relied on ring-opening/ring-closing metathesis, which transformed a cyclobutenecarboxylate into a γ-butenolide. The syntheses confirmed that the correct structure of clavilactone D has an amino group at C-3 instead of a hydroxy group at C-2 in the originally proposed structure.
February 3, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28229338/investigation-of-the-encapsulation-of-metal-cations-cu-2-zn-2-ca-2-and-ba-2-by-the-dipeptide-phe-phe-using-natural-bond-orbital-theory-and-molecular-dynamics-simulation
#15
Snehasis Bhunia, Ajeet Singh, Animesh K Ojha
Complexes of the dipeptide phenylalanine-phenylalanine (Phe-Phe) with divalent metal cations (Cu(2+), Zn(2+), Ca(2+) and Ba(2+)) were studied at the B3LYP and MP2 levels of theory with the basis sets 6-311++G(d,p) and 6-31 + G(d) in the gas phase. The relative energies of these complexes indicated that cation-π bidentate/tridentate conformations are more favourable than other conformations with uncoordinated rings. These findings were confirmed by the calculated values of thermodynamic parameters such as the Gibbs free energy...
March 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28229153/calculations-of-current-densities-for-neutral-and-doubly-charged-persubstituted-benzenes-using-effective-core-potentials
#16
Markus Rauhalahti, Stefan Taubert, Dage Sundholm, Vincent Liégeois
Magnetically induced current density susceptibilities and ring-current strengths have been calculated for neutral and doubly charged persubstituted benzenes C6X6 and C6X6(2+) with X = F, Cl, Br, I, At, SeH, SeMe, TeH, TeMe, and SbH2. The current densities have been calculated using the gauge-including magnetically induced current (GIMIC) method, which has been interfaced to the Gaussian electronic structure code rendering current density calculations using effective core potentials (ECP) feasible. Relativistic effects on the ring-current strengths have been assessed by employing ECP calculations of the current densities...
February 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28229138/eawag-soil-in-envipath-a-new-resource-for-exploring-regulatory-pesticide-soil-biodegradation-pathways-and-half-life-data
#17
Diogo A R S Latino, Jörg Wicker, Martin Gütlein, Emanuel Schmid, Stefan Kramer, Kathrin Fenner
Developing models for the prediction of microbial biotransformation pathways and half-lives of trace organic contaminants in different environments requires as training data easily accessible and sufficiently large collections of respective biotransformation data that are annotated with metadata on study conditions. Here, we present the Eawag-Soil package, a public database that has been developed to contain all freely accessible regulatory data on pesticide degradation in laboratory soil simulation studies for pesticides registered in the EU (282 degradation pathways, 1535 reactions, 1619 compounds and 4716 biotransformation half-life values with corresponding metadata on study conditions)...
February 23, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28228862/highly-bulky-and-stable-geometry-constrained-iminopyridines-synthesis-structure-and-application-in-pd-catalyzed-suzuki-coupling-of-aryl-chlorides
#18
Yi Lai, Zhijian Zong, Yujie Tang, Weimin Mo, Nan Sun, Baoxiang Hu, Zhenlu Shen, Liqun Jin, Wen-Hua Sun, Xinquan Hu
A series of bulky geometry-constrained iminopyridylpalladium chlorides were developed. The steric environment adjacent to the nitrogen atom in the pyridine rings and diimine parts enhanced the thermal stability of the palladium species. Bulkier groups at the imino group stabilized the palladium species and the corresponding palladium chlorides showed high activities in the coupling reaction of aryl chlorides.
2017: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28228468/84-year-old-woman-with-dizziness
#19
William Watson, Liam Ring, Pegah Salahshouri
No abstract text is available yet for this article.
February 22, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28228265/e3-ligase-rnf126-directly-ubiquitinates-frataxin-promoting-its-degradation-identification-of-a-potential-therapeutic-target-for-friedreich-ataxia
#20
Monica Benini, Silvia Fortuni, Ivano Condò, Giulia Alfedi, Florence Malisan, Nicola Toschi, Dario Serio, Damiano Sergio Massaro, Gaetano Arcuri, Roberto Testi, Alessandra Rufini
Friedreich ataxia (FRDA) is a severe genetic neurodegenerative disease caused by reduced expression of the mitochondrial protein frataxin. To date, there is no therapy to treat this condition. The amount of residual frataxin critically affects the severity of the disease; thus, attempts to restore physiological frataxin levels are considered therapeutically relevant. Frataxin levels are controlled by the ubiquitin-proteasome system; therefore, inhibition of the frataxin E3 ligase may represent a strategy to achieve an increase in frataxin levels...
February 21, 2017: Cell Reports
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