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https://www.readbyqxmd.com/read/28738230/fluorinated-tripodal-receptors-for-potentiometric-chloride-detection-in-biological-fluids
#1
Nadezda Pankratova, Maria Cuartero, Laura A Jowett, Ethan N W Howe, Philip A Gale, Eric Bakker, Gastón A Crespo
Fluorinated tripodal compounds were recently reported to be efficient transmembrane transporters for a series of inorganic anions. In particular, this class of receptors has been shown to be suitable for the effective complexation of chloride, nitrate, bicarbonate and sulfate anions via hydrogen bonding. The potentiometric properties of urea and thiourea-based fluorinated tripodal receptors are explored here for the first time, in light of the need for reliable sensors for chloride monitoring in undiluted biological fluids...
July 8, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28737903/transition-metal-functionalization-of-p4-using-a-diarylgermylene-anchor
#2
Cameron M E Graham, Charles L B Macdonald, Philip P Power, Zachary D Brown, Paul J Ragogna
The manipulation of white phosphorus (P4) has been a long-standing challenge for chemists. While the holy grail remains at finding a method to catalytically activate and functionalize P4 to yield new organophosphorus compounds, fundamental research lies in developing procedures to control the reactivity of elemental phosphorus. In this work, Lewis acidic transition metal moieties M(CO)5 (M = Cr, Mo, W) and AuCl react with P4 derivatized with a low valent germanium compound. For both M(CO)5 and AuCl, bis-functionalized products can be formed; however the monosubstituted derivatives are found to be more stable, and the decomposition can be monitored by (31)P{(1)H} NMR spectroscopy...
July 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28737030/enantioselective-palladium-catalyzed-conjugate-additions-of-arylboronic-acids-to-form-bis-benzylic-quaternary-stereocenters
#3
Abhishek A Kadam, Arkady Ellern, Levi M Stanley
We report enantioselective, palladium-catalyzed conjugate additions of arylboronic acids to β-aryl, β,β-disubstituted enones to generate ketones containing bis-benzylic quaternary stereocenters. A catalyst generated from palladium trifluoroacetate and (S)-4-tert-butyl-2-(2-pyridyl)oxazoline ligand ((S)-t-BuPyOx) promotes conjugate additions of a wide range of arylboronic acids to a variety of β-aryl, β,β-disubstituted enones. Iterative addition of the arylboronic acid to minimize undesired protodeboronation pathways leads to efficient formation of the corresponding ketones containing bis-benzylic quaternary stereocenters in up to 92% yield and up to 93% enantioselectivity...
July 24, 2017: Organic Letters
https://www.readbyqxmd.com/read/28736948/evaluating-the-efficacy-of-hydrogen-peroxide-vapour-against-foot-mouth-disease-virus-within-a-bsl4-biosafety-facility
#4
B M Petit, F C Almeida, T R Uchiyama, F O C Lopes, K H Tino, J Chewins
An evaluation was made of the efficacy of 35% Hydrogen Peroxide Vapour (HPV) against FMDV in a biosafety facility. Biological indicators (BIs) were produced using three serotypes of FMDV, all with a titre of ≥10(6) TCID50 /ml. Fifteen BIs of each serotype were distributed across 5 locations, throughout a 30m(3) Air Lock chamber, producing a total of 45 BIs. 35% HPV was generated and applied using a Bioquell vaporisation module located in the centre of the chamber. After a dwell period of 40 minutes, the HPV was removed via the enclosures air handling system and the BIs were collected...
July 23, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28735711/stereoselective-separation-of-%C3%AE-adrenergic-blocking-agents-containing-two-chiral-centers-by-countercurrent-chromatography
#5
Liqiong Lv, Zhisi Bu, Mengxia Lu, Xiaoping Wang, Jizhong Yan, Shengqiang Tong
Four β-adrenergic blocking agents, including 1-[(1-methylethyl)amino]-3-phenoxy-2-propanol (1), 1-[(1-methylethyl)amino]-3-(3-methylphenoxy)-2-propanol (2), 1,1'-[1,4-phenylenebis(oxy)]bis[3-[(1-methylethyl)amino]-2-propanol (3) and 1,1'-[(4-methyl-1,2-phenylene)bis(oxy)]bis[3-[(1-methylethyl)amino]-2-propanol (4), were stereoselectively separated by countercurrent chromatography using di-n-hexyl l-tartrate and boric acid as chiral selector. The compounds (3) and (4) have four optical isomers since they contained two chiral centers...
July 14, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28735244/legacy-and-novel-brominated-flame-retardants-in-interior-car-dust%C3%A2-%C3%A2-implications-for-human-exposure
#6
Athanasios Besis, Christina Christia, Giulia Poma, Adrian Covaci, Constantini Samara
Brominated flame retardants (BFRs) are organobromine compounds with an inhibitory effect on combustion chemistry tending to reduce the flammability of products. Concerns about health effects and environmental threats have led to phase-out or restrictions in the use of Penta-, Octa- and Deca-BDE technical formulations, increasing the demand for Novel BFRs (NBFRs) as replacements for the banned formulations. This study examined the occurrence of legacy and NBFRs in the dust from the interior of private cars in Thessaloniki, Greece, aged from 1 to 19 years with variable origin and characteristics...
July 20, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28735221/physicochemical-properties-of-ionic-and-non-ionic-biocompatible-hydrogels-in-water-and-cell-culture-conditions-relation-with-type-of-morphologies-of-bovine-fetal-fibroblasts-in-contact-with-the-surfaces
#7
Rebeca Rivero, Fabrisio Alustiza, Virginia Capella, Cecilia Liaudat, Nancy Rodriguez, Pablo Bosch, Cesar Barbero, Claudia Rivarola
Cationic, anionic and non-ionic hydrogels having acrylamide polymer backbones were synthesized via free radical polymerization with N,N-methylenebisacrylamide (BIS) as crosslinker. The chemical structures of the hydrogels were characterized by Fourier Transform Infrared Spectroscopy (FTIR). Physicochemical properties such as swelling kinetic, maximum swelling capacity, volume phase transition temperature (VPTT) and wettability (static water contact angle) of hydrogels swollen in aqueous and cell culture medium, at room and cell culture temperatures were studied...
July 11, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28734805/c-reactive-protein-mediating-immunopathological-lesions-a-potential-treatment-option-for-severe-influenza-a-diseases
#8
Rongbao Gao, Lijie Wang, Tian Bai, Ye Zhang, Hong Bo, Yuelong Shu
Severe influenza diseases with high mortality have been frequently reported, especially in those patients infected with avian influenza A (H5N1, H7N9 or H10N8) or during a pandemic. Respiratory distress, which is attributed to alveolar damage associated with immunopathological lesions, is the most common cause of death. There is a wealth of information on pathogenesis or treatment options. In this study, we showed that high levels of C-reactive protein (CRP) were induced and correlated with complement activation in patients infected with severe influenza A (H5N1, H7N9 or H10N8), and higher levels were induced in fatal patients than in survivors...
July 13, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28734209/new-insight-into-the-environmental-impact-of-two-imidazolium-ionic-liquids-effects-on-seed-germination-and-soil-microbial-activity
#9
J Salgado, J J Parajó, T Teijeira, O Cruz, J Proupín, M Villanueva, J A Rodríguez-Añón, P V Verdes, O Reyes
The next generation of ionic liquids must be synthetized taking into account structures that guarantee the suitable properties for a defined application as well as ecological data. Thus, searching of the right methodologies to know, quickly and efficiently, the ecological effects of these compounds is a preliminary task. The effects of two imidazolium based ionic liquids with different anions, 1-butyl-3-methylimidazolium tetrafluoroborate, [C4C1Im][BF4], and 1-propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C3C1Im][NTf2], on seedling emergence of six tree species and on the microbial behaviour of two soils were determined in this work...
July 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28734001/control-of-reversible-activation-dynamics-of-ru-%C3%AE-%C3%A2-%C3%AE%C2%BA%C3%A2-c%C3%A2-h%C3%A2-c%C3%A2-h%C3%A2-nh%C3%A2-xy-n-and-the-effect-of-chelate-ligand-variation
#10
Francisco Martínez-Peña, Ana M Pizarro
The potential use of organometallic ruthenium complexes as anticancer drugs is well known. Here we show a family of activatable tethered ruthenium(II) arene complexes of general formula [Ru(η⁶:κ¹-C₆H₅(C₆H₄)NH₂)(XY)]n+ (closed tether-ring) bearing different chelating XY ligands (XY = aliphatic diamine, phenylenediamine, oxalato, bis(phosphino)ethane). The activation of these complexes (closed-to-open tether conversion) occurs in methanol and dimethylsulfoxide at different rates, and to different reaction extents at equilibrium...
July 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28733841/analgosedation-of-adult-patients-with-elevated-intracranial-pressure-survey-of-current-clinical-practice-in-austria
#11
Guenther Herzer, Claudia Mirth, Udo M Illievich, Wolfgang G Voelckel, Helmut Trimmel
BACKGROUND: Analgesia and sedation are key items in intensive care. Recently published S3 guidelines specifically address treatment of patients with elevated intracranial pressure. METHODS: The Austrian Society of Anesthesiology, Resuscitation and Intensive Care Medicine carried out an online survey of neurointensive care units in Austria in order to evaluate the current state of practice in the areas of analgosedation and delirium management in this high-risk patient group...
July 21, 2017: Wiener Klinische Wochenschrift
https://www.readbyqxmd.com/read/28733021/sonochemical-synthesis-and-structural-characterization-of-a-new-nanostructured-co-ii-supramolecular-coordination-polymer-with-lewis-base-sites-as-a-new-catalyst-for-knoevenagel-condensation
#12
Monika Joharian, Sedigheh Abedi, Ali Morsali
A new Co(II) mixed-ligand coordination supramolecular polymer with composition [Co2(ppda)(4-bpdh)2(NO3)2]n (1) (where, ppda=p-phenylenediacrylic acid, 4-bpdh=2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene) was synthesized using solvothermal, mechanochemical and sonochemical methods. Compound 1 and the new nanostructure have been characterized by single-crystal X-ray, infrared spectroscopy (IR), powder X-ray diffraction (PXRD) analysis and scanning electron microscopy (SEM). The thermal stability of compound 1 was also studied by thermal gravimetric analysis (TGA)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733013/photoluminescence-electrochemical-behavior-and-photocatalytic-activities-of-cobalt-ii-coordination-polymer-nanostructures-synthesized-by-sonochemical-process
#13
Jing-Wang Cui, Yue-Hua Li, Ling-Yan Zhao, Guang-Hua Cui
Nanostructures of a new Co(II) coordination polymer (CP), [Co(Hbibp)(nbta)]n (1), (bibp=4,4'-bis(1-imidazolyl)biphenyl, H3nbta=5-nitro-1,2,3-benzenetricarboxylic acid) was synthesized by a sonochemical method. The nano-sized CP 1 was characterized by elemental analysis, IR spectroscopy, X-ray powder diffraction and scanning electron microscopy (SEM). Structural analysis show that CP 1 exhibits a 1D chain structure with a 3-connected SP 1-periodic net (4,4)(0,2) topology, which can be further extended into a 2D supramolecular layer by the NH⋯O hydrogen bond interactions...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733012/ultrasound-promoted-copper-catalyzed-synthesis-of-bis-arylselanyl-chrysin-derivatives-with-boosted-antioxidant-and-anticancer-activities
#14
Sergio F Fonseca, Nathalia B Padilha, Samuel Thurow, Juliano A Roehrs, Lucielli Savegnago, Maurice N de Souza, Mariana G Fronza, Tiago Collares, Julieti Buss, Fabiana K Seixas, Diego Alves, Eder J Lenardão
Herein we report the use of ultrasonic irradiation (US) in the synthesis of six new semi-synthetic selenium-containing chrysin derivatives by a simple and effective methodology utilizing CuI as catalyst, in good to excellent yields (60-89%). It was observed that US accelerates the reaction compared to conventional heating with excellent selectivity for diselenylated products. Compounds were tested for their antioxidant and anticancer activities in vitro and it was observed that the presence of selenium in the A-ring of chrysin enhanced both antioxidant and anticancer properties...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732993/synthesis-of-a-new-hg-ii-coordination-polymer-ultrasonic-assisted-synthesis-and-mechanical-preparation-of-nanostructure
#15
Fahime Bigdeli, Hassan Hosseini-Monfared, Ali Morsali, Peter Mayer
A new mercury(II) coordination polymer, [Hg(4-bpmo)I2]n (1), (4-bpmo=N,N'-bis(pyridin-4-ylmethyl)oxalamide), was synthesized, by branched tube method, and structurally characterized by single-crystal X-ray diffraction. Compound 1 is a polymer with a distorted tetrahedral HgN2I2 coordination environment. The thermal stability of 1 was studied by thermal gravimetric (TG) and differential thermal (DTA) analyses. Also 1 was prepared by a sonochemical process at ambient temperature. Reaction time and concentration of initial reagents effects on the size and morphology were studied...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732988/sonochemical-synthesis-of-two-nanostructured-silver-i-coordination-polymers-based-on-semi-rigid-bis-benzimidazole-ligands
#16
Shao Yun Hao, Yue Hua Li, Zeng Chuan Hao, Guang Hua Cui
Nanoparticles of two silver(I) coordination polymers (CPs), [Ag2(L1)2(DCTP)]n (1) and [Ag2(L2)(DCTP)]n (2) (L1=1,3-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene, L2=1,4-bis(benzimidazol-1-yl)-2-butene, H2DCTP=2,5-dichloroterephthalic acid), were synthesized by the sonochemical approach and hydrothermal method. Both CPs were characterized by elemental analysis, IR spectra, single-crystal X-ray diffraction, scanning electron microscopy (SEM), and thermogravimetric analyses (TGA). CP 1 exhibits a 2D 4-connected sql net with the point symbol {4(4)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732973/enhanced-photodegradation-of-dye-in-waste-water-using-iron-vanadate-nanocomposite-ultrasound-assisted-preparation-and-characterization
#17
Maryam Ghiyasiyan-Arani, Masoud Salavati-Niasari, Sara Naseh
The paper proposes a new approach to Schiff-base ligand assisted sonochemical synthesis of iron vanadate. In this disquisition, we tried to comparing various factors and reaction condition on morphology, size and uniformity of as-obtained samples. Some parameters including Schiff-base capping agent (Bis(acetylacetone) ethylenediamine=H2acacen), electrolyte (NH4F), solvent and reaction time were investigated to reach optimum condition. XRD, FT-IR, EDS, SEM and TEM were used in order to determine purity and structural morphology of as-synthesized products...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732924/ultrasonic-irradiation-enhanced-the-ability-of-fluorescein-da-fe-iii-on-sonodynamic-and-sonocatalytic-damages-of-dna-molecules
#18
Qiong Wu, Xia Chen, Lizhen Jia, Yi Wang, Ying Sun, Xingjun Huang, Yuxiang Shen, Jun Wang
The interaction of DNA with Bis [N,N-bis (carboxymethyl) aminomethyl] fluorescein-Ferrous(III) (Fluorescein-DA-Fe(III)) with dual functional (sonodynamic and sonocatalytic) activity was studied by UV-vis spectroscopy, fluorescence spectroscopy, FT-IR spectroscopy, circular dichroism (CD) spectroscopy and viscosity measurements. And then, the damage of DNA caused by Fluorescein-DA-Fe(III) under ultrasonic irradiation (US) was researched by agarose gel electrophoresis and cytotoxicity assay. Meanwhile, some influenced factors such as ultrasonic irradiation time and Fluorescein-DA-Fe(III) concentration on the damage degree of DNA molecules were also examined...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732889/a-comparative-study-on-chitosan-gelatin-composite-films-with-conjugated-or-incorporated-gallic-acid
#19
Liyun Rui, Minhao Xie, Bing Hu, Li Zhou, Danyang Yin, Xiaoxiong Zeng
Gallic acid-grafted-chitosan (GA-g-CS) was synthesized in the presence of 1-ethyl-3-(3'-dimethylaminopropyl) carbodiimide and hydroxybenzotriazole under room temperature. To develop a kind of newly functional film, CS, gelatin, glycerol and Tween 20 were utilized to prepare CS-based composite films with incorporated GA (GA-CS) or conjugated GA (GA-g-CS), and the films were characterized in aspects of physical and functional properties, as well as microstructures. With the increasing of GA concentration, there was a reduction in transmittance, elongation at break and water vapor permeability (WVP) for GA-CS film...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28732322/effects-of-environmental-pollutants-on-signaling-pathways-in-rat-pituitary-gh3-adenoma-cells
#20
Nicoletta Fortunati, Federica Guaraldi, Valentina Zunino, Federica Penner, Valentina D'Angelo, Francesco Zenga, Francesca Pecori Giraldi, Maria Graziella Catalano, Emanuela Arvat
An increased rate of acromegaly was reported in industrialized areas, suggesting an involvement of environmental pollutants in the pathogenesis and behavior of GH-secreting pituitary adenomas. Based on these premises, the aim of the study was to evaluate the effects of some widely diffused pollutants (i.e. benzene, BZ; bis(2-ethylhexyl) phthalate, DEHP and polychlorinated biphenyls, PCB) on growth hormone secretion, the somatostatin and estrogenic pathways, viability and proliferation of rat GH-producing pituitary adenoma (GH3) cells...
July 18, 2017: Environmental Research
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