103,164 research outputs found
The EPR study of Mn2+ ion doped DADT single crystal produced under high pressure and temperature
No full textceylan, umit/0000-0002-1461-9889WOS: 000365367100085PubMed: 26137878An EPR study on Cu2+ and VO2+ doped di ammonium D-tartrate single crystals has been reported in previous papers, but the same host did not accept Mn2+ ion at the same reaction conditions in previous trials. In this study EPR study of Mn2+ ion doped di ammonium D tartrate single crystal, (DADT) [(NH4)(2)C4H4O6], produced in a reactor under high pressure and high temperature. The electronic transitions were determined by the optical absorption spectrum. Hyperfine splitting and g values of the Mn2+ ion forming a complex in the lattice were measured from experimental spectra and spin spin dipolar splitting parameters D and E were found by the spectrum simulation techniques. (C) 2015 Elsevier B.V. All rights reserved.BAP, Ondokuz Mayis University (Samsun)Ondokuz Mayis University [PYO. FEN. 1904.09.017, FEN 1901-10.001]This work was financially supported by the BAP, Ondokuz Mayis University (Samsun) (Project numbers: PYO. FEN. 1904.09.017 and FEN 1901-10.001)
Sur les Weddas de Ceylan, fragment d'une traduction du Standard
No full textMillescamps G. Sur les Weddas de Ceylan, fragment d'une traduction du Standard . In: Bulletins de la Société d'anthropologie de Paris, II° Série. Tome 11, 1876. pp. 11-14
La géologie de Ceylan : An Introduction to the Geology of Ceylon, P. G. Cooray
No full textDupuis Jacques. La géologie de Ceylan : An Introduction to the Geology of Ceylon, P. G. Cooray. In: Annales de Géographie, t. 82, n°452, 1973. p. 493
La géologie de Ceylan : An Introduction to the Geology of Ceylon, P. G. Cooray
No full textDupuis Jacques. La géologie de Ceylan : An Introduction to the Geology of Ceylon, P. G. Cooray. In: Annales de Géographie, t. 82, n°452, 1973. p. 493
roots be considered as a new source of natural compounds?
No full textPlant-based foods have become attractive for scientists and food producers. Beneficial effects related to their consumption as dietary supplements are due to the presence of natural occurring secondary metabolites. In this context, studies on these products are important for natural and safely food ingredients evaluation. The aim of this study was to evaluate root extract of eight Asphodeline species as antioxidants, enzyme inhibitors and phytochemical content. Spectrophotometric antioxidant and enzyme inhibitory assays were performed. Total phenolic and flavonoids contents as well as the chemical free-anthraquinones profiles were determined using routinely procedure (HPLC-PDA). Data show that Asphodeline roots can be considered as a new source of natural compounds and can be used as a valuable dietary supplement. Some differences related to biological activities can be inferred to other phytochemicals that can be considered in the future for their synergic or competitive activities.Selcuk University, Science Faculty, Department of Biology; University "G. d'Annunzio'' of Chieti-PescaraAuthors declare no conflict of interest. Financial support for this research is from the Selcuk University, Science Faculty, Department of Biology and from University "G. d'Annunzio'' of Chieti-Pescara
An Unusual Mechanism of Delayed Intracerebral Hemorrhage After Ventriculoperitoneal Shunting: Case Report
No full textWe present a case of delayed intracerebral hemorrhage that developed seven years after initial ventriculoperitoneal shunt surgery. A seven-year-old boy was admitted to emergency when he experienced sudden headache and vomiting. Computed tomography (CT) scanning showed an intracerebral hemorrhage around the ventricular catheter that cannot be explained by known predisposing factors such as head trauma, coexisting bleeding disorder, occult vascular malformation, and intratumoral hemorrhage. The presumed mechanism in this case is that the ventricular catheter caused contusion of cerebral tissue because the shunt tube at the neck had stretched during the growing up of the child
Onosma ambigens: Phytochemical composition, antioxidant and enzyme inhibitory activity
No full text0000-0002-4435-8405WOS: 000554526900038Due to their medical importance, the number of studies on the enlightenment of the biological activities of Onosma species has been increasing over the years. In this study, besides the phytochemical composition of Onosma ambigens Lacaita (Boraginaceae), in vitro antioxidant, tyrosinase and alpha-amylase inhibitory activities of extracts obtained by using different solvents (ethyl acetate, methanol and water) were investigated. As a result of the spectrophotometric analysis, it was determined that methanol extract was rich in both phenolics (51.19 mg GAEs/g extract) and flavonoids (45.39 mg QEs/g extract). According to the results of liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) analysis, the major components of methanol extract were determined as rosmarinic acid (37670.55 mu g/g), luteolin 7-glucoside (15756.40 mu g/g), apigenin 7-glucoside (15080.34 mu g/g), luteolin (2289.77 mu g/g), apigenin (2240.38 mu g/g), chlorogenic acid (2121.92 mu g/g), vanillic acid (1179.66 mu g/g), hesperidin (1038.38 mu g/g), 4-hydroxybenzoic acid (961.97 mu g/g) and pinoresinol (631.61 mu g/g). It was found that methanol extract showed remarkable activity in almost all antioxidant activity tests (except ferrous ion chelating test). The activity of this extract in the phosphomolybdenum, reducing power [cupric reducing antioxidant capacity (CUPRAC) and ferric reducing antioxidant power (FRAP)] and radical scavenging [on 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS)] assays were measured as 1.65, 0.95, 0.52, 1.86 and 1.45 mg/mL, respectively. Phenolic and flavonoid contents, especially chlorogenic acid, vanillic acid, luteolin 7-glucoside, hesperidin and rosmarinic acid, are thought to contribute significantly to the antioxidant activity of the extracts. In tyrosinase and a-amylase inhibitory activity tests, methanol (2.81 mg/mL) and ethyl acetate (2.64 mg/mL) extracts exhibited the best activity among the others, respectively. While it is thought that chlorogenic acid and rosmarinic acid may contribute to the tyrosinase inhibitory activity of methanol extract, it has been concluded that detailed chromatographic analyzes should be performed for detection of the compounds responsible for alpha-amylase inhibitory activity
A strategy based on the dispersive liquid-liquid microextraction of cadmium in environmental samples prior to ıts determination by flame atomic absorption spectrometry
No full textThis work has been supported by the Scientific Research Projects of Karadeniz Technical University (Project no: 1223), Turkey.A simple method was developed by combining dispersive liquid-liquid microexraction (DLLME) and flame atomic absorption spectrometry (FAAS). For the pre-concentration of trace amounts of cadmium, a new complexation chelate of 2-[(4-phenylpiperazine-5-Thioxo- 4,5-dihydro-1 ,3,4-oxadiazole-2- yl)methyl]-5-methyl-4-[2-(1H-indol e-3-yl)ethyl]-2,4-dihydro-3H-1, 2,4-Triazole-3-one (PPTOMDT) was used and mixed with the solvents of chloroform and methanol. The mixture of the extraction solutions was then directly injected into an aqueous solution containing Cd2+ ions. After centrifugation, the settled phase was diluted with 500 mu L of ethanol/nitric acid and aspirated into the FAAS. The limit of detection (LOD) was found at 0.69 mu g L-1 under optimum conditions. The relative standard deviation (RSD) for 15 replicates at a 3.75 mu g L-1 Cd2+ concentration level was 3.21%. The calibration plot was linear within the range of 2.5-15 mu g L-1 of Cd2+. After the analytical characteristics were determined, the CRM-TMDW-500 Drinking Water and CRM-SA-C Sandy Soil C, both certified reference materials, were analyzed in order to validate the method. The application of the DLLME method has been successfully tested for the determination of cadmium in solid and liquid samples. The recoveries of the spiked sample ranged between 92-96%
A comprehensive study on phytochemical characterization of Haplophyllum myrtifolium Boiss. endemic to Turkey and its inhibitory potential against key enzymes involved in Alzheimer, skin diseases and type II diabetes
No full text0000-0002-4435-8405WOS: 000338612500031The interest of medicinal plants as therapeutic agents against diseases such as Alzheimer, skin disorders and diabetes mellitus is growing. In order to investigate the influence of Haplophyllum myrufolium, four solvent extracts (petroleum ether, ethyl acetate, methanol and water) were screened for antioxidant potentials, anti-cholinesterase, anti-tyrosinase, anti-amylase and anti-glycosidase activity. Antioxidant effects were elucidated by different assays including free radical scavenging (ABTS, DPPH and NO assay), reducing power (FRAP and CUPRAC), phosphomolybdenum, beta-carotene/linoleic acid system and metal chelating. Total phenolic, flavonoid, flavanol, tannin and saponin contents in these extracts were also calculated. Generally, ethyl acetate extract showed the strongest antioxidant activity in these extracts. This activity may be related to a good total phenolic content. The total phenolic contents of these extracts ranged from 32.32 to 52.50 mg GAEs/g extract. Except for water extract, all extracts showed good inhibitory activities on cholinesterase, tyrosinase, amylase and glycosidase. Apolar extracts (petroleum ether and ethyl acetate) were more potent as enzyme inhibitors in comparison to polar extracts (methanol and water). These findings reveal that H. myrtifolium could be used a source of natural compounds for the management of oxidative damage, Alzheimer, skin disorders and diabetes mellitus. (C) 2014 Elsevier B.V. All rights reserved
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
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