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Photonics and Optoelectronics    [3 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 2304-1064 - ISSN (Online) 2304-1072
     Published by Science and Engineering Publishing Company Homepage  [46 journals]
  • The Relationship between the Structure and the Binding to Bovine Serum
           Albumin of Some Styrylcyanine Dyes
    • Abstract: The Relationship between the Structure and the Binding to Bovine Serum Albumin of Some Styrylcyanine Dyes
      Pages 15-25
      Author Gairat KhodjayevEldar N. KurtalievNegmat Nizomo
      Spectral-fluorescent characteristics of styrylcyanine dye Sbt ((E)-2-(4-(dimethylamino) styryl)-3-methylbenzo [d] thiazol-3-ium iodide) and its derivatives in aqueous solutions with and without the presence of bovine serum albumin (BSA) were studied. In the presence of BSA for all studied dyes in the absorption spectra, we observed an increase in the absorption intensity, a small broadening, and a new band of the shorter wavelengths with λmax=412 nm. The intensity of the fluorescence emission of the baseband of the studied dyes in the presence of BSA increased from 1.1 to 4.6 times. The binding constant (K) and the number of binding sites (N) of the studied dyes with BSA were determined. The dependence of the binding constant with BSA on the dipole moment of the dye molecules was determined, which indicated that besides electrostatic attraction forces, hydrophobic interactions are significant between styrylcya¬nine dyes with BSA molecules. It was demonstrated that the aggregation of dyes influences the interactions of dyes with BSA.
      PubDate: 2014-01
  • Optical Studies on L-Tartaric acid and L-Prolinium Tartrate
    • Abstract: Optical Studies on L-Tartaric acid and L-Prolinium Tartrate
      Pages 9-14
      Author K. MoovendaranS. NatarajanV. Jayaramakrishna
      Bulk-size single crystals of the nonlinear optical (NLO) materials: L-tartaric acid (LTA) and L-prolinium tartrate (LPT) were grown from aqueous solution using a home made crystal growth setup. Characterization of the crystals was investigated using single crystal X-ray diffraction. UV-vis-NIR spectra showed that the crystals have excellent transparency in the visible and infrared regions. Tentative assignments were made for the IR absorption peaks. The birefringence of the crystals was measured in the visible region and it was found to be varying with wavelength. Photoluminescence excitation studies showed that the emission occurred at 397 and 375 nm respectively, for LTA and LPT. The second harmonic generation (SHG) conversion efficiency of the powder samples of the crystals were measured as about 40% and 95% respectively, compared to that of the standard KDP crystals.
      PubDate: 2014-01
  • Shear Bond Strength of Different Adhesive Systems on Enamel Prepared by
           Er: YAG LASER
    • Abstract: Shear Bond Strength of Different Adhesive Systems on Enamel Prepared by Er: YAG LASER
      Pages 1-8
      Author João C. FerreiraSofia Arantes-OliveiraWalter R. DiasPaulo R. MeloPatrícia T. PiresÁlvaro F. Azeved
      To evaluate Shear Bond Strength (SBS) values of different dental adhesives on Er:YAG laser prepared enamel and bur prepared enamel, one hundred and fifty bovine incisors were randomly assigned to SBS tests on enamel (n=15) in ten different groups. Groups 1 to 5 were prepared with Er:YAG laser. Groups 6 to 10 were mechanical prepared. Followed by: Group 1 and 6 – 37% phosphoric acid (PA) + ExciTE®; Group 2 and 7 – AdheSE®; Group 3 and 8 – FuturaBond® NR; Group 4 and 9 – ExciTE®; Group 5 and 10 – Xeno® V. After the adhesive systems samples were subjected to thermal cycling, SBS were performed in an universal testing machine at 5mm/min. Data were treated with two-way ANOVA, and post-hoc test (Student knewman keuls) (p
      PubDate: 2014-01
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