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https://www.readbyqxmd.com/read/29779224/ir-catalyzed-silyl-directed-peri-borylation-of-c-h-bonds-in-fused-polycyclic-arenes-and-heteroarenes
#1
Bo Su, John F Hartwig
peri-Disubstituted naphthalenes exhibit interesting physical properties and unique chemical reactivity, due to the parallel arrangement of the bonds to the two peri-disposed substituents. Regioselective installation of a functional group at the position peri to 1-substituted naphthalenes is challenging due to the steric interaction between the existing substituent and the position at which the second one would be installed. We report an iridium-catalyzed borylation of the C-H bond peri to a silyl group in naphthalenes and analogous polyaromatic hydrocarbons...
May 20, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29778676/development-of-an-anion-imprinted-polymer-for-high-and-selective-removal-of-arsenite-from-wastewater
#2
Lili Fang, Xiaoye Min, Renfei Kang, Haiyan Yu, Spyros G Pavlostathis, Xubiao Luo
A novel cyclic functional monomer (CFM) was used to develop an As(III)-ion imprinted polymer (As-IIP). CFM possesses a positively charged imidazolium moiety and its specific cyclic size matches that of As(III). Batch adsorption experiments showed that the As-IIP has a maximum As(III) adsorption capacity of 55 mg/g, while that of the control polymer (CP) is only 25 mg As(III)/g. Adsorption isotherms for As(III) agree with the Langmuir model, suggesting monolayer adsorption. Kinetic studies showed that the adsorption process followed pseudo-second-order kinetics...
May 17, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29778272/development-of-the-waveless-bovine-model
#3
F Jimenez-Krassel, J L H Ireland, C Kronemeyer, A Wilson-Alvarado, J J Ireland
Development of a bovine model without ovarian follicular waves (waveless) and transient increases in gonadotropin secretion during estrous cycles may lead to new methods to more consistently regulate ovulatory follicle growth thereby improving efficiency of embryo transfer. We hypothesized that the GnRH antagonist acyline would inhibit gonadotropin secretion thereby blocking follicular waves, ovarian function and ovulation during estrous cycles of cattle. To test this hypothesis, beef heifers (n = 5 per group) were treated twice daily with vehicle (control) or 25 or 50 μg/kg acyline beginning 12 h after GnRH-induced ovulation and ending 21 days later...
May 15, 2018: Animal Reproduction Science
https://www.readbyqxmd.com/read/29777930/experimental-and-theoretical-study-of-fingerprint-spectra-of-2-4-fluorophenyl-benzimidazole-and-2-4-chlorophenyl-benzimidazole-in-terahertz-range
#4
Maojiang Song, Fei Yang, Liping Liu, Li Shen, Pengfei Hu, Caixia Su
Due to wide variety of biological and pharmacological activities of benzimidazole derivatives, the terahertz fingerprint spectra of 2-(4-fluorophenyl)benzimidazole and 2-(4-chlorophenyl)benzimidazole are researched by employing terahertz time-domain spectroscopy and density functional theory systematically. Although the substituent at the para position on the benzene moiety are the same family elements (F, Cl) in the periodic table, both experimental and theoretical results show that there are substantial differences in their fingerprint spectra in the range of 0...
May 10, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29777569/improving-metabolic-stability-with-deuterium-the-discovery-of-hwl-066-a-potent-and-long-acting-free-fatty-acid-receptor-1-agonists
#5
Chunxia Liu, Zheng Li, Wei Shi, Huilan Li, Nasi Wang, Yuxuan Dai, Chen Liao, Wenlong Huang, Hai Qian
The free fatty acid receptor 1 (FFA1) is a potential target due to its function in enhancing of glucose-stimulated insulin secretion. The FFA1 agonist GW9508 has great potential for the treatment of type 2 diabetes mellitus, but it has been suffering from high plasma clearance probably because the phenylpropanoic acid is vulnerable to β-oxidation. To identify orally available analog without influence on the unique pharmacological mechanism of GW9508, we tried to interdict the metabolically labile group by incorporating two deuterium atoms at the α-position of phenylpropionic acid affording compound 4 (HWL-066)...
May 18, 2018: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/29777329/population-pharmacokinetics-of-theophylline-in-adult-chinese-patients-with-asthma-and-chronic-obstructive-pulmonary-disease
#6
Yanjiao Ma, Ling Xue, Xin Chen, Yingbo Kang, Yong Wang, Liqing Wang
Background Theophylline has a narrow therapeutic range and large interindividual variability in blood levels, so a thorough understanding of its pharmacokinetic characteristics is essential. Population pharmacokinetic (PPK) approaches could achieve it and many PPK studies of theophylline have been reported in infants. However, none was conducted in Chinese adults and none has explored the effect of CYP1A2 genotypes on the PPK characteristics of theophylline in adults. Objective To evaluate the PPK characteristics of theophylline and to assess the possible influence of covariates, including CYP1A2 genotypes, on theophylline clearance in Chinese adult patients...
May 18, 2018: International Journal of Clinical Pharmacy
https://www.readbyqxmd.com/read/29777196/single-measurement-detection-of-individual-cell-ionic-oscillations-using-an-n-type-semiconductor-electrolyte-interface
#7
Mariusz Pietruszka, Monika Olszewska, Lukasz Machura, Edward Rówiński
Pollen tubes are used as models in studies on the type of tip-growth in plants. They are an example of polarised and rapid growth because pollen tubes are able to quickly invade the flower pistil in order to accomplish fertilisation. How different ionic fluxes are perceived, processed or generated in the pollen tube is still not satisfactorily understood. In order to measure the H+ , K+ , Ca2+ and Cl- fluxes of a single pollen tube, we developed an Electrical Lab on a Photovoltaic-Chip (ELoPvC) on which the evolving cell was immersed in an electrolyte of a germination medium...
May 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29776996/effects-of-chronic-exposure-to-12%C3%A2-saltwater-on-the-endocrine-physiology-of-juvenile-american-alligator-alligator-mississippiensis
#8
P C Faulkner, M L Burleson, L Simonitis, C Marshall, D Hala, L H Petersen
American alligator ( Alligator mississippiensis , Linnaeus) habitats are prone to saltwater intrusion following major storms, hurricanes or droughts. Anthropogenic impacts affecting hydrology of freshwater systems may exacerbate saltwater intrusion into freshwater habitats. The endocrine system of alligators is susceptible to changes in the environment but it is currently not known how the crocodilian physiological system responds to environmental stressors such as salinity. Juvenile alligators were exposed to 12‰ saltwater for 5 weeks to determine effects of chronic exposure to saline environments...
May 18, 2018: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29776017/pharmacokinetics-and-c-reactive-protein-modelling-of-anti-il-6-antibody-pf-04236921-in-healthy-volunteers-and-patients-with-autoimmune-disease
#9
Cheryl Li, Satoshi Shoji, Jean Beebe
AIMS: The purpose of this study was to characterize pharmacokinetics (PK) of PF-04236921, a novel anti-IL-6 monoclonal antibody, and its pharmacokinetics/pharmacodynamics (PK/PD) relationship on serum C-Reactive Protein (CRP) in healthy volunteers and patients with rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), and Crohn's disease (CD) METHODS: Population modelling analyses were conducted using nonlinear mixed effects modelling. Data from 2 phase 1 healthy volunteer studies, a phase 1 RA study, a Phase 2 CD study, and a Phase 2 SLE study were included...
May 18, 2018: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/29775883/hydrolysis-and-recycling-of-urea-formaldehyde-resin-residues
#10
Ming Liu, Yan Wang, Yiqiang Wu, Hui Wan
Urea formaldehyde (UF) resin residues generate many poisonous chemicals during traditional disposal technologies for organic hazardous wastes. In this study, hydrothermal hydrolysis was developed to decompose, remove, and recycle cured UF resin. Under 140 °C and 2 h of hydrothermal process, 20 mL of either 2 M HCl or 30 w.t. % of formaldehyde solutions can decompose as much as 1.7 g of cured UF resin. In addition, from the attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR), gas chromatography-mass spectroscopy (GCMS), X-ray diffraction (XRD), and 1 H nuclear magnetic resonance (NMR) analyses, it confirmed that the hydrothermal hydrolysis could hydrolyze cured UF resin...
May 15, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29774331/heterobimetallic-triple-decker-complexes-derived-from-a-dianionic-aromatic-stannole-ligand
#11
Masaichi Saito, Naoki Matsunaga, Jumpei Hamada, Shunsuke Furukawa, Mao Minoura, Susann Wegner, Juri Barthel, Christoph Janiak
A neutral heterobimetallic triple-decker stannole complex was prepared by the reaction of an anionic ruthenocene bearing a stannole dianionic ligand with [Rh(cod)Cl]2 (cod = 1,5-cyclooctadiene), and the resulting Ru-Rh complex exhibits an electronic property different from those of the corresponding Ru-Ru and Rh-Rh complexes. The Ru-Rh complex can be decomposed in ionic liquids to metal nanoparticles.
May 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29774325/effect-of-halogen-dopants-on-the-properties-of-li-2-o-2-is-chloride-special
#12
Henry A Cortes, Verónica L Vildosola, María Andrea Barral, Horacio R Corti
There is consensus on the fact that one of the main limitations of Li air batteries (LABs) is the insulating character of Li2O2 and that it becomes crucial to explore new conduction paths. Recent studies indicate that doping with chloride increases the ion conductivity of Li2O2, although to a much lesser extent than expected if chloride is assumed to be a donor dopant [Gerbig et al., Adv. Mater., 2013, 25, 3129]. Subsequently, it has been shown that the addition of lithium chloride, LiCl, to the battery electrolyte increases its discharge capacity, while this effect is not observed with other halogens [Matsuda et al...
May 18, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29773687/the-role-of-intercalated-cell-nedd4-2-in-bp-regulation-ion-transport-and-transporter-expression
#13
Masayoshi Nanami, Truyen D Pham, Young Hee Kim, Baoli Yang, Roy L Sutliff, Olivier Staub, Janet D Klein, Karen I Lopez-Cayuqueo, Regine Chambrey, Annie Y Park, Xiaonan Wang, Vladimir Pech, Jill W Verlander, Susan M Wall
Background Nedd4-2 is an E3 ubiquitin-protein ligase that associates with transport proteins, causing their ubiquitylation, and then internalization and degradation. Previous research has suggested a correlation between Nedd4-2 and BP. In this study, we explored the effect of intercalated cell (IC) Nedd4-2 gene ablation on IC transporter abundance and function and on BP. Methods We generated IC Nedd4-2 knockout mice using Cre-lox technology and produced global pendrin/ Nedd4-2 null mice by breeding global Nedd4-2 null ( Nedd4-2-/- ) mice with global pendrin null ( Slc26a4-/- ) mice...
May 17, 2018: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/29772945/the-efficiency-of-the-uterocervical-angle-in-the-prediction-of-second-trimester-pregnancy-terminations-in-multiparous-women
#14
Berna Aslan Cetin, Begum Aydogan Mathyk, Nadiye Koroglu, Gozde Demirezen, Gokce Turan, Gokhan Demirayak, Gokhan Yildirim
AIM: To show how uterocervical angles are used for the prediction of second-trimester pregnancy terminations in multiparous women. MATERIAL AND METHODS: A total of 148 multiparous singleton women in their second trimesters were enrolled in this prospective study. The intracervical Foley catheter was used for the induction of delivery. The cervical length (CL) and the uterocervical angle (UCA) were measured before the beginning of induction. The study population was subdivided into four groups; successful and failed terminations at the end of 24 and 48 h time frames...
May 17, 2018: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29772890/application-of-decision-tree-for-prediction-of-cutaneous-leishmaniasis-incidence-based-on-environmental-and-topographic-factors-in-isfahan-province-iran
#15
Roghieh Ramezankhani, Nooshin Sajjadi, Roya Nezakati Esmaeilzadeh, Seyed Ali Jozi, Mohammad Reza Shirzadi
Cutaneous Leishmaniasis (CL) is a neglected tropical disease that continues to be a health problem in Iran. Nearly 350 million people are thought to be at risk. We investigated the impact of the environmental factors on CL incidence during the period 2007- 2015 in a known endemic area for this disease in Isfahan Province, Iran. After collecting data with regard to the climatic, topographic, vegetation coverage and CL cases in the study area, a decision tree model was built using the classification and regression tree algorithm...
May 8, 2018: Geospatial Health
https://www.readbyqxmd.com/read/29772528/peptide-inhibitors-of-chloride-channels-for-treating-secretory-diarrhea
#16
Jitu Ma, Xueqin Ding, Yulong Yin, Pengfei Huang
Morbidity and mortality associated with diarrheal diseases remain significant burdens on global health. In the developing world, the major sources of secretory diarrhea are infectious, including those caused by bacteria such as enterotoxic Escherichia coli , and viruses such as rotavirus. In many cases of secretory diarrhea, activation of pathways for cyclic nucleotides and/or Ca2+ signaling in the apical membrane of enterocytes increases the conductance of Cl- channels at the enterocyte lumen-facing membrane...
June 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/29772297/pharmacokinetic-profile-and-oral-bioavailability-of-kaurenoic-acid-from-copaifera-spp-in-rats
#17
Dalyara Mendonça de Matos, Milainy Rocha Viana, Marcela Cristina de Oliveira Alvim, Lara Soares Aleixo de Carvalho, Laura Hora Rios Leite, Ademar Alves da Silva Filho, Jorge Willian Leandro Nascimento
Kaurenoic acid (KA) is a kaurane diterpene found in several medicinal plants that displays biological activities, such as anti-inflammatory, smooth muscle relaxant and hypotensive response. However, there are no pharmacokinetic data available about this molecule. The purpose of the study was to determine the pharmacokinetics profile and the oral bioavailability of KA in rats. Wistar rats submitted to jugular vein cannulation received 50 mg/kg of KA by intravenous or oral route. The implanted cannula allowed intravenous administration and serial blood collection along 10 h...
May 14, 2018: Fitoterapia
https://www.readbyqxmd.com/read/29771509/extzbox-a-glowing-cyclophane-for-live-cell-imaging
#18
Indranil Roy, Sharan Bobbala, Jiawang Zhou, Minh T Nguyen, Siva Krishna Mohan Nalluri, Yilei Wu, Daniel Ferris, Evan Alexander Scott, Michael R Wasielewski, J Fraser Stoddart
The ideal fluorescent probe for live-cell imaging is bright, non-cytotoxic and can be delivered easily into the living cells in an efficient manner. The design of synthetic fluorophores, having all three of these properties, however, has proved to be challenging. Here, we introduce a simple, yet effective, strategy based on well-established chemistry for designing a new class of fluorescent probes for live-cell imaging. A box-like hybrid cyclophane, namely ExTzBox•4X (6•4X, X = PF6 - , Cl- ), has been synthesized by connecting an extended viologen (ExBIPY) and a dipyridyl thiazolothiazole (TzBIPY) unit in an end-to-end fashion with two p-xylylene ( p-Xy) linkers...
May 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29771501/noninnocent-ligand-in-rhodium-iii-complex-catalyzed-c-h-bond-amination-with-tosyl-azide
#19
Daiki Fujita, Hideki Sugimoto, Yuma Morimoto, Shinobu Itoh
Six-coordinate rhodium(III) complexes coordinated by a planar trianionic ligand (L3- ) are synthesized. One of the axial positions is occupied by chloride (Cl- ), bromide (Br- ), or iodide (I- ), and another axial position is coordinated by a solvent molecule such as acetonitrile (AN), water (H2 O), tetrahydrofuran (THF), or pyridine (PY) to complete an octahedral rhodium(III) center; [RhIII (L3- )(X)(Y)]- (1X/Y ; X = Cl- , Br- , or I- , Y = AN, H2 O, THF, or PY). Coordination of the AN, H2 O, and THF ligands to the metal center is rather weak, so that these solvent molecules are easily replaced by PY to give [RhIII (L3- )(Cl)(PY)]- ...
May 17, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29770986/the-influence-of-binding-site-geometry-on-anion-binding-selectivity-a-case-study-of-macrocyclic-receptors-built-on-an-azulene-skeleton
#20
Dawid Lichosyt, Sylwia Wasiłek, Paweł Dydio, Janusz Jurczak
The understanding of the host-guest interactions lies at the very heart of supramolecular chemistry. Often a minute change to the structure of a receptor can have a dramatic impact on the binding selectivity. Herein, we studied the influence of small perturbations in biding site geometry for a series of five closely correlated macrocyclic tetra-amide receptors, constructed from building blocks out of a pool of azulene-based units. The solid-state structures revealed that the conformational preferences of the free receptors are driven by the inherent preferences of the building blocks, yet in some cases the macrocyclic topology is able to override these to promote pre-organized conformations favorable for anion binding...
May 17, 2018: Chemistry: a European Journal
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