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Optical Properties of Intraocular Implants Coated with Silver Nanoparticles

100%
Jeż K., Gacek M., Nabiałek M., Toth L., Pike-Biegunski M., Jeż K., Gacek M., Nabiałek M., Toth L., Pike-Biegunski M.
Archives of Metallurgy and Materials
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2021
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vol. 66
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issue 2
2
Content available remote

1H NMR and spectrophotometric study of alkaline metal ion complexes with N-dansyl aza-18-crown-6

88%
Ossowski T., Sulowska1 H., Karbowiak T., Zarzeczanska D., Gierczyk B., Schroeder G.
Open Chemistry
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2006
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vol. 4
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issue 1
13-28
EN
Formation of complexes of A18C6-Dns and metal cations (Ca2+, Sr2+, Ba2+ and Mg2+) in acetonitrile has been studied by NMR, absorption and fluorescence spectroscopy and PM5 semi-empirical methods. A18C6-Dns forms stable complexes with Ca2+, Sr2+ and Ba2+ cations. The stability constants of various complexes are determined by different methods and their structures are visualised by the PM5 semi-empirical calculations.
3
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UV-absorption studies of interaction of karanjin and karanjachromene with ds. DNA: Evaluation of binding and antioxidant activity

88%
Arshad N., Rashid N., Absar S., Abbasi M., Saleem S., Mirza B.
Open Chemistry
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2013
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vol. 11
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issue 12
2040-2047
EN
Two flavonoids, karanjin (Kj) and karanjachromene (Kc) have been investigated spectrophotometrically for their mode of interactions with double stranded (ds)-DNA at blood (7.4) and stomach (4.7) pH and at human body temperature (37°C). Benesi-Hildebrand equation was used to evaluate the binding constants, K b . Binding constants at both pH values and at body temperature showed stronger binding of both the flavonoids and formation of 1:1 flavonoid-DNA complex via intercalative mode. However, K b values for karanjin were evaluated to be comparatively greater than karanjachromene at both pH values. The highest value of binding constant (1.32×105 M−1) for karanjin at blood pH (7.4) demonstrated its comparatively stronger binding and greater effectiveness at this pH. Standard Gibbs free energy changes (ΔG) of flavonoid-DNA complexes were calculated as negative values and indicative of spontaneity of their binding. Both flavonoids showed significant DNA protection activity. [...]
4
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Spectroscopic route to monitoring individual surfactant ions and micelles in aqueous solution: A case study

88%
Geng J., Johnson B., Wheatley A., Luo J.
Open Chemistry
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2014
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vol. 12
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issue 3
307-311
EN
Using a very popular and commonly used surfactant sodium dodecylbenzene sulfonate (SDBS, C18H29SO3Na) for a case study, we report a new method of monitoring different forms of surfactant molecules in aqueous solution and measuring their critical micelle concentration (CMC) by ultraviolet-visible (UV-Vis) spectroscopy. The forms of SDBS micelles are also investigated by synthesizing and characterizing NiB nanoparticles using the micelles as molecular templates. In addition, the observed shifts of UV-Vis bands are analysed from the viewpoint of the electrons locations and distributions within the molecules and the possible overlap of their electronic orbitals between neighbouring molecules in each micelle.
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