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Reactive Attachment

Hamid Saeidian, Seyed Esmaeil Hosseini, Ali Amoozadeh, Mohammad Taghi Naseri, Mehran Babri
Electron ionization mass spectrum of sarin(Se) was interpreted in compare of sarin MS spectrum. Inhibition of butyrylcholinesterase (BuChE) of human plasma by sarin and sarin(Se) was determined spectrophotometrically using modified Ellman's method. It appeared that after incubation with sarin and sarin(Se), cholinesterase inhibition were 93% and 83%, respectively. Sarin, sarin(Se) and sarin(Se)-d7 were spiked into a vial containing human plasma and albumin adduct metabolites were identified using liquid chromatography-tandem mass spectrometry LC-MS/MS...
November 13, 2017: Journal of Mass Spectrometry: JMS
Jian Cheng, Jun Sun, Jiekuan Yan, Song Yang, Pengcheng Zheng, Zhichao Jin, Yonggui Robin Chi
Metal-free catalytic functionalization of aromatic sp2-carbons and benzylic sp3-carbons remains challenging. Here we report a carbene-catalyzed activation and functionalization of the 3-methyl sp3-carbon attached to 2-formyl-indoles. The reaction proceeds through an NHC-bound o-quinodimethane as the key intermediate generated from 2-formyl-3-methylindoles under oxidative conditions. Reactive ketones are found to be effective substrates to produce substituted hydropyrano[3,4-b]indoles in good to excellent yields...
November 13, 2017: Journal of Organic Chemistry
Chin M Wong, Matthew B Peterson, Indrek Pernik, Roy T McBurney, Barbara A Messerle
Rhodium(I) complexes were explored as catalysts for the hydrogen borrowing reactions of amines and alcohols. Bidentate carbene-triazole ligands were readily synthesized via "click" reactions which allowed a diversity of ligand backbones to be accessed. The catalytic transformations are highly efficient, able to reach completion in under 6 h, and promote C-N bond formation across a range of primary alcohol and amine substrates. Moreover, site-selective catalysis can be achieved using substrates with more than one reactive site...
November 13, 2017: Inorganic Chemistry
Zhiling Zhu, Haoqing Chen, Siheng Li, Xunmo Yang, Eric Bittner, Chengzhi Cai
Ancillary ligands, especially the tripodal ligands such as tris(triazolylmethyl)amines, have been widely used to accelerate the Cu-catalyzed azide-alkyne cycloaddition (CuAAC, a "click" reaction). However, the relationship between the activity of these Cu(I) complexes and their stability against air oxidation and ligand dissociation/exchange was seldom studied, which is critical for the applications of CuAAC in many biological systems. In this work, we synthesized twenty-one Cu(I) tripodal ligands varying in chelate arm length (five to seven atoms), donor groups (triazolyl, pyridyl and phenyl), and steric hindrance...
2017: Catalysis Science & Technology
Maria Hepel, Magdalena Stobiecka
Oxidative stress biomarkers, including glutathione (GSH) and related compounds, are involved in a variety of interactions enabling redox potential maintenance in living cells and protection against radicals. Since the oxidative stress is promoting and, in many cases, inducing serious illnesses, monitoring of GSH levels can aid in diagnostics and disease prevention. Herein, we report on the discovery of the formation of a supramolecular ensemble of GSH with fluorone black (9-phenyl fluorone, FB) which is optically active and enables sensitive determination of GSH by resonance elastic light scattering (RELS)...
November 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Paweł Wityk, Miłosz Wieczór, Samanta Makurat, Lidia Chomicz-Mańka, Jacek Czub, Janusz Rak
Brominated nucleobases sensitize double stranded DNA to hydrated electrons, one of the dominant genotoxic species produced in hypoxic cancer cells during radiotherapy. Such radiosensitizers can therefore be administered locally to enhance treatment efficiency within the solid tumor while protecting the neighboring tissue. When a solvated electron attaches to 8-bromoadenosine, a potential sensitizer, the dissociation of bromide leads to a reactive C8 adenosyl radical known to generate a range of DNA lesions...
November 9, 2017: Journal of Chemical Theory and Computation
Wei-Chun Shih, Oleg V Ozerov
Transition-metal mediated C-H functionalization has emerged as a powerful method in the chemistry relevant to the synthesis of pharmaceuticals, agrochemicals, and advanced materials. Because organic molecules typically contain multiple types of C-H bonds, selective C-H functionalization is a major ongoing challenge. C-H activation of heteroatom-containing organics has often been approached via the use of the directing effect, whereby the coordination to the basic heteroatom directs the reactive metal center to a specific C-H bond...
November 17, 2017: Journal of the American Chemical Society
Ling Chen, Bin Wei, Liang Xu, Yun Wu
OBJECTIVES: The present study was designed to investigate the association of four inflammatory markers and five periodontal indexes with the risk of coronary heart disease (CHD) in 131 patients with type 2 diabetes mellitus (T2DM). METHODS: All subjects were inpatients, including 63 T2DM patients with comorbid CHD ("cases") and 68 T2DM patients without CHD ("controls"). The diagnosis of CHD is based on coronary angiography. RESULTS: Peripheral blood concentrations of high sensitivity C-reactive protein (hs-CRP) (11...
October 28, 2017: Diabetes Research and Clinical Practice
Olga A Ivanova, Alexey O Chagarovskiy, Alexey N Shumsky, Vasiliy D Krasnobrov, Irina I Levina, Igor V Trushkov
We report a mild Lewis acid-induced isomerization of donor-acceptor cyclopropanes, containing an alkenyl moiety and diverse electron-withdrawing group(s) at the adjacent positions, into substituted cyclopentenes. We have found that 1,1,2-trisubstituted cyclopent-3-enes were exclusively obtained in yield of 51 to 99% when cyclopropanes with 2-substituted alkenyl group as a donor underwent isomerization. For cyclopropanes bearing trisubstituted alkenyl group either the corresponding cyclopent-3-enes or isomeric cyclopent-2-enes having two acceptor groups at the C(1) atom were formed, with the reaction selectivity being determined by the applied Lewis acid...
November 7, 2017: Journal of Organic Chemistry
Sara F Waters, Wendy Berry Mendes
Coordinated social behavior and positive affect shared between parent and child in early life provide a foundation for healthy social and emotional development. We examined physiological (cardiac vagal responses) and relational (attachment security) predictors of dyadic behavioral coordination in a sample of 13-month-old infants and their mothers (N = 64). We tested whether cardiac vagal responses moderated the association between attachment security and behavioral coordination. The main effect of attachment on coordination was moderated by infant cardiac vagal tone (i...
December 2016: Adaptive Human Behavior and Physiology
Akbar Ali, Showkat Ali Ganie, Nasreen Mazumdar
Gum arabic, a plant polysaccharide was oxidized with periodate to produce aldehyde groups by the cleavage of diols present in the sugar units. The oxidized gum was then iodinated with iodine monochloride (ICl) and the interaction between electrophilic iodine, I(+) and reactive carbonyl groups of the modified gum was studied.Results of titrimetric estimation performed to determine the extent of oxidation and aldehyde content in the oxidized gum showed that degree of oxidation ranged between 19.68-50.19% which was observed to increase with periodate concentration; the corresponding aldehyde content was calculated to be 5...
January 15, 2018: Carbohydrate Polymers
A Kortyna, A J Samin, T A Miller, D J Nesbitt
Highly reactive benzyl radicals are generated by electron dissociative attachment to benzyl chloride doped into a neon-hydrogen-helium discharge and immediately cooled to Trot = 15 K in a high density, supersonic slit expansion environment. The sub-Doppler spectra are fit to an asymmetric-top rotational Hamiltonian, thereby yielding spectroscopic constants for the ground (v = 0) and first excited (v = 1, ν3, ν4) vibrational levels of the ground electronic state. The rotational constants obtained for the ground state are in good agreement with previous laser induced fluorescence measurements (LIF), with vibrational band origins (ν3 = 3073...
November 3, 2017: Physical Chemistry Chemical Physics: PCCP
Guillaume Raffy, Robin Bofinger, Arnaud Tron, André Del Guerzo, Nathan D McClenaghan, Jean-Marc Vincent
An innovative photopatterning process is described that allows, in a single laser-promoted operation, the covalent attachment of a molecule on a surface (2D patterning - xy dimensions) and its photopolymerization to grow micro-/nanostructures with spatial control in a third z-dimension. The surface patterning process, based on nitrene reactivity, was harnessed using the highly fluorescent azide-substituted boron difluoride dipyrromethene (BODIPY) 1 that was prepared in a single synthetic step from the parent pentafluorophenyl BODIPY on reacting with NaN3...
November 9, 2017: Nanoscale
Takashi Yagi, Yoshihiro Fujikawa, Tomoko Sawai, Takeji Takamura-Enya, Sayoko Ito-Harashima, Masanobu Kawanishi
Aryl hydrocarbons such as 3-nitrobenzanthrone (NBA), 4-aminobiphenyl (ABP), acetylaminofluorene (AAF), benzo(a)pyrene (BaP), and 1-nitropyrene (NP) form bulky DNA adducts when absorbed by mammalian cells. These chemicals are metabolically activated to reactive forms in mammalian cells and preferentially get attached covalently to the N(2) or C8 positions of guanine or the N(6) position of adenine. The proportion of N(2) and C8 guanine adducts in DNA differs among chemicals. Although these adducts block DNA replication, cells have a mechanism allowing to continue replication by bypassing these adducts: translesion DNA synthesis (TLS)...
October 2017: Toxicological Research
Verinder Sharma
Childbirth can trigger a variety of psychiatric disorders; however, no disorder is as profoundly affected by childbirth as bipolar disorder. Rates of psychiatric comorbidity especially anxiety disorders, obsessive compulsive disorder, and substance use disorders are quite high in individuals with bipolar disorder. The purpose of this scoping review is to ascertain the effect of childbirth on the relationship between the onset of bipolar disorder and comorbid psychiatric disorders. On June 27, 2017, a search of the Medline, PsycINFO, CINHAL, EMBASE, SCOPUS, COCHRANE, and ISI-Web of Science (WOS) databases was performed using the terms mental disorders, mental disease, major depressive disorder, major depression, depression, panic disorder, bipolar disorder, comorbidity, anxiety disorders, obsessive compulsive disorder, post-traumatic stress disorder, schizophrenia, eating disorders, reactive attachment disorder, childbirth, parturition, puerperium, postpartum, postpartum period and postnatal period...
October 24, 2017: Archives of Women's Mental Health
Ruikun Du, Lili Wang, Hao Xu, Zhiying Wang, Tao Zhang, Manli Wang, Yunjia Ning, Fei Deng, Zhihong Hu, Hualin Wang, Yi Li
The worldwide prevalence of herpes simplex virus (HSV) and the shortage of efficient vaccines and novel therapeutic strategies against HSV are widely global concerns. The abundance on the virion and the major stimulus for the virus-neutralizing antibodies makes gD a predominant candidate for cure of HSV infection. In this study, we generated a monoclonal antibody (mAb), termed m27f, targeting to glycoprotein D (gD) of HSV-2, which also has cross-reactivity against HSV-1 gD. It has a high level of neutralizing activity against both HSV-1 and HSV-2, and binds to a highly conserved region (residues 292-297) within the pro-fusion domain of gD...
October 20, 2017: Antiviral Research
Regan J Anderson, Jasmine Li, Lukasz Kedzierski, Benjamin J Compton, Colin M Hayman, Taryn L Osmond, Ching-Wen Tang, Kathryn J Farrand, Hui-Fern Koay, Catarina Filipa Dos Santos Sa E Almeida, Lauren R Holz, Geoffrey M Williams, Margaret A Brimble, Zhongfang Wang, Marios Koutsakos, Katherine Kedzierska, Dale I Godfrey, Ian F Hermans, Stephen J Turner, Gavin F Painter
The development of a universal vaccine for influenza A virus (IAV) that does not require seasonal modification is a long-standing health goal, particularly in the context of the increasing threat of new global pandemics. Vaccines that specifically induce T cell responses are of considerable interest because they can target viral proteins that are more likely to be shared between different virus strains and subtypes and hence provide effective cross-reactive IAV immunity. From a practical perspective, such vaccines should induce T cell responses with long-lasting memory, while also being simple to manufacture and cost-effective...
November 17, 2017: ACS Chemical Biology
Sara Moghnie, Artak Tovmasyan, James Craik, Ines Batinic-Haberle, Ludmil Benov
Photodynamic therapy (PDT) is a promising alternative approach particularly attractive for treatment of localized fungal infections. It is based on compounds, photosensitizers (PSs), which when excited with visible light, generate reactive species that ultimately cause cell death. Such species have short lifespans; as a consequence, efficiency and selectivity of the PDT treatment depend mainly on the properties of the PSs. This study is the first to explore the effect of cationic porphyrin-based photosensitizers on Saccharomyces cerevisiae, a member of the fungus kingdom...
November 8, 2017: Photochemical & Photobiological Sciences
K Mayer, L J Schiegerl, T Kratky, S Günther, T F Fässler
Molecules with low-valent Ge atoms are generally synthesized from organohalogen germanes as precursors. The Zintl phase K4Ge9 provides reactive building blocks for a targeted synthesis of germanium-rich molecules. The silylation of Ge9 clusters with chlorosilanes ClSiR2R', that carry unsaturated olefin groups R' leads to the introduction of olefinic side chains of variable lengths allowing for further reactions. The compounds K[Ge9{Si(SiMe3)3}2(SiPh2R')] (R' = -CH[double bond, length as m-dash]CH2 (1); -(CH2)3CH[double bond, length as m-dash]CH2 (2)) carry one such functionality, whereas K[Ge9(SiPh2R')3] (3 and 4) offer the possibility for an interconnection of clusters due to three functional groups on the Ge9 core...
August 22, 2017: Chemical Communications: Chem Comm
Ulrike Dapunt, Caroline Bürkle, Frank Günther, Wojciech Pepke, Stefan Hemmer, Michael Akbar
BACKGROUND: Implant-associated infections are still a feared complication in the field of orthopedics. Bacteria attach to the implant surface and form so-called biofilm colonies that are often difficult to diagnose and treat. Since the majority of studies focus on prosthetic joint infections (PJIs) of the hip and knee, current treatment options (eg, antibiotic prophylaxis) of implant-associated infections have mostly been adapted according to these results. OBJECTIVE: The aim of this study was to evaluate patients with surgical site infections following instrumented stabilization of the spine with regard to detected bacteria species and the course of the disease...
2017: Therapeutics and Clinical Risk Management
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