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https://www.readbyqxmd.com/read/28444920/synthesis-of-mono-bis-and-tris-pentafluoroethyl-tin-derivatives-c2f5-4-nsnxn-x-ph-me-cl-br-cp-n%C3%A2-%C3%A2-1-3
#1
Johannes Klösener, Markus Wiesemann, Mark Niemann, Beate Neumann, Hans-Georg Stammler, Berthold Hoge
For (pentafluoroethyl)phenylstannanes, (C2F5)4-nSnPhn (n = 1-3), and dimethylbis(pentafluoroethyl)stannane, (C2F5)2SnMe2, a high yield synthesis was developed by the use of LiC2F5 as a C2F5 transfer reagent. The treatment of these products with gaseous hydrogen chloride or hydrogen bromide afforded (C2F5)4-nSnXn (X = Cl, Br; n = 1-3) in good yields. The (pentafluoroethyl)stannanes were fully characterized by 1H, 13C, 19F and 119Sn NMR, IR spectroscopy and mass spectrometry. The treatment of the (pentafluoroethyl)tin halides (C2F5)4-nSnXn with 1,10-phenanthroline (phen) led to the formation of the corresponding octahedrally coordinated complexes [(C2F5)4-nSnXn(phen)], the structures of which were elucidated by X-ray diffraction analyses...
April 26, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28444836/ephedra-alkaloid-contents-of-chinese-herbal-formulae-sold-in-taiwan
#2
Chih-Wei Chang, Szu-Yun Hu, Guan-Qian Huang, Mei-Chich Hsu
Consumption of Ephedra alkaloids has been prohibited in-competition by the World Anti-Doping Agency (WADA). In Taiwan, colds are often treated with Chinese herbal formulae containing Herba Ephedrae. We screened the products sold in Taiwan and preliminarily assessed their relationships with WADA threshold violations. Fifty-six concentrated powder products, including 19 Chinese herbal formulae that contained Herba Ephedrae, were collected. The content of Ephedra alkaloids, namely ephedrine (E), methylephedrine (ME), norpseudoephedrine (NPE; cathine), pseudoephedrine (PE), and norephedrine (NE; phenylpropanolamine), was determined using a validated high-performance liquid chromatography method...
April 25, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28444699/design-synthesis-and-chemistry-of-bis-%C3%AF-borate-and-agostic-complexes-of-group-7-metals
#3
Koushik Saha, Rongala Ramalakshmi, Suman Gomosta, Kriti Pathak, Vincent Dorcet, Thierry Roisnel, Jean-François Halet, Sundargopal Ghosh
A series of new bis()borate and agostic complexes of group 7 metals have been synthesized and structurally characterized from various borate ligands, such as, Na[(H3B)bbza], Na[(H3B)abz] and Na[(H2B)mp2] (bbza = bis(benzothiazol-2-yl)amine, abz = 2-aminobenzothiazolyl and mp = 2-mercaptopyridyl). Photolysis of [Mn2(CO)10] with Na[(H3B)bbza] led to the formation of bis()borate complex [Mn(CO)3(μ-H)2BHNCSC6H4(NR)], 1 (R = NCSC6H4). Under similar reaction conditions, [Re2(CO)10] generated an octahedral complex [Re(CO)2(N3C2S2C12H8)2], 2...
April 25, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28443936/effects-of-graphene-defects-on-gas-sensing-properties-towards-no2-detection
#4
Filiberto Ricciardella, Sten Vollebregt, Tiziana Polichetti, Mario Miscuglio, Brigida Alfano, Maria L Miglietta, Ettore Massera, Girolamo Di Francia, Pasqualina M Sarro
The crystal structure of graphene flakes is expected to significantly affect their sensing properties. Here we report an experimental investigation on the crystalline structure of graphene aimed at exploring the effects on the gas sensing properties. The morphology of graphene, prepared via Chemical Vapor Deposition (CVD), Liquid Phase Exfoliation (LPE) and Mechanical Exfoliation (ME), is inspected through Raman spectroscopy, Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). CVD and LPE-graphene structures are found to be more defective with respect to ME-graphene...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443863/-fefe-hydrogenase-active-site-model-chemistry-in-a-uio-66-metal-organic-framework
#5
Sonja Pullen, Souvik Roy, Sascha Ott
The reactivity of [Fe2(dcbdt)(CO)6] (1) confined in a UiO-66(Zr) metal-organic framework towards CO ligand substitutions with phosphines of different sizes was investigated. The reaction with smaller phosphines (PX3, X = Me, Et) is more selective compared to analogous reactions in homogenous solution phase, and two CO ligands at up to 80% of all [FeFe] sites in UiO-66-1 are replaced. The produced [Fe2(dcbdt)(CO)4(PX3)2] complexes in the UiO-66 matrix behave like typical [FeFe] hydrogenase active site model complexes, are reduced at more cathodic potentials than their hexacarbonyl analogues, and form bridging hydrides under acidic conditions...
April 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28443534/developing-an-international-scoring-system-for-a-consensus-based-social-cognition-measure-msceit-managing-emotions
#6
G S Hellemann, M F Green, R S Kern, G Sitarenios, K H Nuechterlein
BACKGROUND: Measures of social cognition are increasingly being applied to psychopathology, including studies of schizophrenia and other psychotic disorders. Tests of social cognition present unique challenges for international adaptations. The Mayer-Salovey-Caruso Emotional Intelligence Test, Managing Emotions Branch (MSCEIT-ME) is a commonly-used social cognition test that involves the evaluation of social scenarios presented in vignettes. METHOD: This paper presents evaluations of translations of this test in six different languages based on representative samples from the relevant countries...
April 26, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/28443396/unfair-decision
#7
Roslyn Poslad
The recent cautioning of nurse Jane Kendall by the NMC for not beginning cardiopulmonary resuscitation (CPR) on a deceased patient left me feeling like the world had gone topsy-turvy (features, 12 April).
April 26, 2017: Nursing Standard
https://www.readbyqxmd.com/read/28443335/selective-complexation-of-cyanide-and-fluoride-ions-with-ammonium-boranes-a-theoretical-study-on-sensing-mechanism-involving-intramolecular-charge-transfer-and-configurational-changes
#8
Haamid Rasool Bhat, Prakash Chandra Jha
The anion binding selectivity and the recognition mechanism of two isomeric boranes namely 4-[bis(2,4,6-trimethylphenyl)boranyl]-N,N,N-trimethylaniline ([p-(Mes2B)C6H4(NMe3)]+, 1, where 'Mes' represents mesitylene and 'Me' represents methyl) and 2-[bis(2,4,6-trimethylphenyl)boranyl]-N,N,N-trimethylaniline ([o-(Mes2B)C6H4(NMe3)]+, 2) has been investigated using density functional theory (DFT) and time dependent-density functional theory (TD-DFT) methods. Natural population analysis indicates that the central boron atoms in 1 and 2 are the most active centers for nucleophilic addition of anions...
April 26, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28441964/fecal-metagenomic-profiles-in-subgroups-of-patients-with-myalgic-encephalomyelitis-chronic-fatigue-syndrome
#9
Dorottya Nagy-Szakal, Brent L Williams, Nischay Mishra, Xiaoyu Che, Bohyun Lee, Lucinda Bateman, Nancy G Klimas, Anthony L Komaroff, Susan Levine, Jose G Montoya, Daniel L Peterson, Devi Ramanan, Komal Jain, Meredith L Eddy, Mady Hornig, W Ian Lipkin
BACKGROUND: Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is characterized by unexplained persistent fatigue, commonly accompanied by cognitive dysfunction, sleeping disturbances, orthostatic intolerance, fever, lymphadenopathy, and irritable bowel syndrome (IBS). The extent to which the gastrointestinal microbiome and peripheral inflammation are associated with ME/CFS remains unclear. We pursued rigorous clinical characterization, fecal bacterial metagenomics, and plasma immune molecule analyses in 50 ME/CFS patients and 50 healthy controls frequency-matched for age, sex, race/ethnicity, geographic site, and season of sampling...
April 26, 2017: Microbiome
https://www.readbyqxmd.com/read/28441077/comparison-of-conbercept-with-ranibizumab-for-the-treatment-of-macular-edema-secondary-to-branch-retinal-vein-occlusion
#10
Fengjiao Li, Ming Sun, Jianlian Guo, Aihua Ma, Bojun Zhao
PURPOSE: To confirm the therapeutic efficacy of conbercept for the treatment of macular edema (ME) secondary to branch retinal vein occlusion (BRVO). METHODS: In this prospective, randomized, and comparative study, patients were randomized and divided into conbercept (n = 18) and ranibizumab (n = 17) groups. After an initial intravitreal injection of either conbercept or ranibizumab, a pro re nata (PRN) strategy was adopted based on loss of visual acuity (VA) or increase in central macular thickness (CMT)...
April 25, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28440828/synthesis-duplex-forming-ability-enzymatic-stability-and-in-vitro-antisense-potency-of-oligonucleotides-including-2-c-4-c-ethyleneoxy-bridged-thymidine-derivatives
#11
Takashi Osawa, Motoki Sawamura, Fumito Wada, Tsuyoshi Yamamoto, Satoshi Obika, Yoshiyuki Hari
We synthesized thymidine derivatives of 2'-C,4'-C-ethyleneoxy-bridged 2'-deoxyribonucleic acids with an 8'-methyl group ((R)-Me-EoDNA and (S)-Me-EoDNA) and without any substituent (EoDNA). Oligonucleotides including these EoDNAs showed high hybridization abilities with complementary RNA and excellent enzymatic stabilities compared with natural DNA. Moreover, the in vitro antisense potency of oligonucleotides with these EoDNAs and our recently reported methylene-EoDNAs was investigated and compared with that of LNA, which is a practical chemical modification for oligonucleotide-therapeutic agents...
April 25, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28440389/thermal-behaviour-of-lixmeo2-me-co-or-ni-mn-co-cathode-materials
#12
Petronela Gotcu, Wilhelm Pfleging, Peter Smyrek, Hans J Seifert
Thermal behaviour and thermophysical properties of two typical cathodes for lithium-ion batteries were studied in dependence of temperature. The cathode materials are composite thick films containing a mixture of 90 wt% LiMeO2 active material (with Me = Co or Me = Ni + Mn + Co, respectively) and additives (binder and carbon black), deposited on aluminium current collector foils. The thermal conductivity of each cathode type and their corresponding composite layers were determined up to 573 K from the measured thermal diffusivity, the specific heat capacity and the estimated density based on metallographic methods and structural investigations...
April 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28439372/let-me-tell-you-a-story-creating-successful-wellness-initiatives-for-residency-programs
#13
EDITORIAL
Glenn Paetow
No abstract text is available yet for this article.
April 2017: Journal of Graduate Medical Education
https://www.readbyqxmd.com/read/28438724/toward-a-more-usable-home-based-video-telemedicine-system-a-heuristic-evaluation-of-the-clinician-user-interfaces-of-home-based-video-telemedicine-systems
#14
Sruthy Agnisarman, Shraddhaa Narasimha, Kapil Chalil Madathil, Brandon Welch, Fnu Brinda, Aparna Ashok, James McElligott
BACKGROUND: Telemedicine is the use of technology to provide and support health care when distance separates the clinical service and the patient. Home-based telemedicine systems involve the use of such technology for medical support and care connecting the patient from the comfort of their homes with the clinician. In order for such a system to be used extensively, it is necessary to understand not only the issues faced by the patients in using them but also the clinician. OBJECTIVES: The aim of this study was to conduct a heuristic evaluation of 4 telemedicine software platforms-Doxy...
April 24, 2017: JMIR Human Factors
https://www.readbyqxmd.com/read/28438540/potent-and-selective-oxytocin-receptor-agonists-without-disulfide-bridges
#15
Yusuke Adachi, Katsuya Sakimura, Yuji Shimizu, Masaharu Nakayama, Yasuko Terao, Takahiko Yano, Taiji Asami
Oxytocin (OT) is a neuropeptide involved in a wide variety of physiological actions, both peripherally and centrally. Many human studies have revealed the potential of OT to treat autism spectrum disorders and schizophrenia. OT interacts with the OT receptor (OTR) as well as vasopressin 1a and 1b receptors (V1aR, V1bR) as an agonist, and agonistic activity for V1aR and V1bR may have a negative impact on the therapeutic effects of OTR agonism in the CNS. An OTR-selective agonistic peptide, FE 202767, in which the structural differences from OT are a sulfide bond instead of a disulfide bond, and N-alkylglycine replacement for Pro at position 7, was reported...
April 12, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28438313/analysis-of-the-metal-layer-thickness-influence-on-the-dispersion-characteristics-of-acoustic-waves-propagating-in-the-layered-piezoelectric-structure-me-aln-me-diamond
#16
S I Burkov, O P Zolotova, B P Sorokin
The paper presents the results of computer simulation of the acoustic waves propagation in piezoelectric layered structures based on diamond substrate under the influence of various metal film deposition. It has been observed that the maximum phase velocity change Δv/v is achieved with an "Au/(001) AlN/Au/(100) diamond" PLS configuration. However, if the acoustic impedance of the metal layer is greater than the acoustic impedance of the substrate, an elastic wave reflection can be observed, reducing the Δv/v quantities...
March 18, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28437897/investigation-of-transmission-performance-in-multi-ifof-based-mobile-fronthaul-with-dispersion-induced-intermixing-noise-mitigation
#17
Minkyu Sung, Seung-Hyun Cho, Hwan Seok Chung, Sun Me Kim, Jong Hyun Lee
We demonstrate the improvement of the transmission performance based on intermixing noise mitigation techniques in a multiple intermediate-frequency-over-fiber (IFoF) based mobile fronthaul. The interaction between fiber chromatic dispersion and frequency chirp of the directly modulated laser generates the second-order distortion that degrades the performance of multi-IFoF transmission system. To avoid second-order distortion, we use intermediate frequency (IF) spacing optimization and octave-confined frequency plan schemes in which intermixing noise would be generated in the out of signal band and would not affect the quality of transmitted signal...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437659/the-relationship-between-maternal-education-and-the-neural-substrates-of-phoneme-perception-in-children-interactions-between-socioeconomic-status-and-proficiency-level
#18
Lisa L Conant, Einat Liebenthal, Anjali Desai, Jeffrey R Binder
Relationships between maternal education (ME) and both behavioral performances and brain activation during the discrimination of phonemic and nonphonemic sounds were examined using fMRI in children with different levels of phoneme categorization proficiency (CP). Significant relationships were found between ME and intellectual functioning and vocabulary, with a trend for phonological awareness. A significant interaction between CP and ME was seen for nonverbal reasoning abilities. In addition, fMRI analyses revealed a significant interaction between CP and ME for phonemic discrimination in left prefrontal cortex...
April 21, 2017: Brain and Language
https://www.readbyqxmd.com/read/28437046/somebody-s-watching-me
#19
Paul Feuerstein
No abstract text is available yet for this article.
July 2016: Dentistry Today
https://www.readbyqxmd.com/read/28436519/a-ruthenium-ii-bis-phosphinophosphinine-complex-as-a-precatalyst-for-transfer-hydrogenation-and-hydrogen-borrowing-reactions
#20
R J Newland, M F Wyatt, R L Wingad, S M Mansell
The 2-phosphinophosphinine 2-PPh2-3-Me-6-SiMe3-PC5H2 (2) has been prepared and was shown to act as a κ(2)-chelating ligand in cis-[RuCl2(2)2] (4). Complex 4 was a competent precatalyst for the room temperature transfer hydrogenation of acetophenone (0.1 mol% 4 and 0.5 mol% KO(t)Bu) and the conversion of methanol/ethanol mixtures to the advanced biofuel isobutanol in 50% yield and 96% selectivity.
April 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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