in this work, we report synthesis of surface modified superparamagnetic iron oxide nanoparticles (spion) by co-precipitation method using feso4.7h2o and fe2(so4)3.5h2o as precursors and trisodium citrate dihydrate as surfactant. surface modification of the as prepared samples was performed in pot by sol-gel precipitation method using tetraethoxysilane (teos). the structure, morphology, and magn...

The purpose of the present paper is to develop light beam method to measurement of interfacial area in a rectangular gas-liquid bubble column. Total interfacial area can be determined in bubble column filled by transparent liquid by light transmission method. According to pervious researches, the fraction of parallel light is function of interfacial area and optical path l...

introduction: in this study, we intend to use diffuse optical tomography (dot) as a noninvasive, safe and low cost technique that can be considered as a functional imaging method and mention the importance of image reconstruction in accuracy and procession of image. one of the most important and fastest methods in image reconstruction is the boundary element method (bem). this method is introdu...

A microarray-based resonance light scattering assay, with the combination of methylation-sensitive endonuclease and gold nanoparticle (GNP) probes, has been proposed to sensitively distinguish the DNA methylation level as low as 0.01% (10 pM methylated DNA in 100 nM total DNA) and detect human DNA methyltransferase 1 (Dnmt1) down to 0.1 U mL(-1).

A review on the work performed by our group on slow light via Stimulating Brillouin scattering (SBS) is presented. We describe the fundamentals of the slow-light phenomena and how SBS can be used to obtain tunable optical delays in optical fibers. We then review the mechanisms to overcome the limitations imposed by the narrow SBS resonance bandwidth and to optimize the slow-light performance fo...

We study a simple model for a molecule subjected to a short laser pulse. We derive very simple expressions for resonance Raman and resonance Rayleigh scattering amplitudes to leading order in the strength μ of the laser and the Born–Oppenheimer parameter for the molecule. We also briefly consider the situation where the incident light is close to, but not exactly at the resonance frequency for ...

– We observe light-induced frequency shifts in one-color photoassociative spectra of magnetically trapped He atoms in the metastable 2S1 state. A pair of ultracold spinpolarized 2S1 helium atoms is excited into a molecular bound state in the purely long range 0+u potential connected to the 2 S1−2 P0 asymptote. The shift arises from the optical coupling of the molecular excited bound state with ...

A novel biosensing strategy has been developed for sensitive detection of β-amyloid 1-42 (Aβ(1-42)) down to the ng mL(-1) level in both aqueous solution and diluted human plasma, which is based on measuring changes in resonance light scattering of streptavidin functionalized gold nanoparticles as a function of the concentration of Aβ(1-42) with a conventional spectrofluorometer.

According to UV-visible spectroscopy, X-ray diffraction spectrometry, dynamic light scattering, Fourier transform infrared spectroscopy, electron paramagnetic resonance spectroscopy, transmission electron microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy, nano-sized manganese oxides are proposed as active catalysts for water oxidation in the reaction of some manganes...

We demonstrate a dark-field microscopic technique for real-time monitoring of DNA metallization. The growth of silver nanoparticles on DNA molecules was observed using plasmon resonance light scattering in the presence of a weak catalyst triggering photo-reduction of Ag(+). This simple strategy could facilitate the controlled fabrication of DNA-templated nanoelectronic devices.