@article{sanaeifar_rabiee_abdolrahim_tahriri_vashaee_tayebi_2017, title={A novel electrochemical biosensor based on Fe3O4 nanoparticles-polyvinyl alcohol composite for sensitive detection of glucose}, volume={519}, ISSN={1096-0309}, url={http://dx.doi.org/10.1016/j.ab.2016.12.006}, DOI={10.1016/j.ab.2016.12.006}, abstractNote={In this research, a new electrochemical biosensor was constructed for the glucose detection. Iron oxide nanoparticles (Fe3O4) were synthesized through co-precipitation method. Polyvinyl alcohol-Fe3O4 nanocomposite was prepared by dispersing synthesized nanoparticles in the polyvinyl alcohol (PVA) solution. Glucose oxidase (GOx) was immobilized on the PVA-Fe3O4 nanocomposite via physical adsorption. The mixture of PVA, Fe3O4 nanoparticles and GOx was drop cast on a tin (Sn) electrode surface (GOx/PVA-Fe3O4/Sn). The Fe3O4 nanoparticles were characterized by X-ray diffraction (XRD). Also, Fourier transform infrared (FTIR) spectroscopy and field emission scanning electron microscopy (FE-SEM) techniques were utilized to evaluate the PVA-Fe3O4 and GOx/PVA-Fe3O4 nanocomposites. The electrochemical performance of the modified biosensor was investigated using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Presence of Fe3O4 nanoparticles in the PVA matrix enhanced the electron transfer between enzyme and electrode surface and the immobilized GOx showed excellent catalytic characteristic toward glucose. The GOx/PVA-Fe3O4/Sn bioelectrode could measure glucose in the range from 5 × 10-3 to 30 mM with a sensitivity of 9.36 μA mM-1 and exhibited a lower detection limit of 8 μM at a signal-to-noise ratio of 3. The value of Michaelis-Menten constant (KM) was calculated as 1.42 mM. The modified biosensor also has good anti-interfering ability during the glucose detection, fast response (10 s), good reproducibility and satisfactory stability. Finally, the results demonstrated that the GOx/PVA-Fe3O4/Sn bioelectrode is promising in biosensor construction.}, journal={ANALYTICAL BIOCHEMISTRY}, publisher={Elsevier BV}, author={Sanaeifar, Niuosha and Rabiee, Mohammad and Abdolrahim, Mojgan and Tahriri, Mohammadreza and Vashaee, Daryoosh and Tayebi, Lobat}, year={2017}, month={Feb}, pages={19–26} }
 @article{li_arif_cory_haun_heacock_huber_nsofini_pushin_saggu_sarenac_et al._2016, title={Neutron limit on the strongly-coupled chameleon field}, volume={93}, ISSN={2470-0010 2470-0029}, url={http://dx.doi.org/10.1103/PhysRevD.93.062001}, DOI={10.1103/physrevd.93.062001}, abstractNote={The physical origin of the dark energy that causes the accelerated expansion rate of the Universe is one of the major open questions of cosmology. One set of theories postulates the existence of a self-interacting scalar field for dark energy coupling to matter. In the chameleon dark energy theory, this coupling induces a screening mechanism such that the field amplitude is nonzero in empty space but is greatly suppressed in regions of terrestrial matter density. However measurements performed under appropriate vacuum conditions can enable the chameleon field to appear in the apparatus, where it can be subjected to laboratory experiments. Here we report the most stringent upper bound on the free neutron-chameleon coupling in the strongly coupled limit of the chameleon theory using neutron interferometric techniques. Our experiment sought the chameleon field through the relative phase shift it would induce along one of the neutron paths inside a perfect crystal neutron interferometer. The amplitude of the chameleon field was actively modulated by varying the millibar pressures inside a dual-chamber aluminum cell. We report a 95% confidence level upper bound on the neutron-chameleon coupling β ranging from β < 4.7 × 106 for a Ratra-Peebles index of n = 1 in the nonlinear scalar field potential to β < 2.4 × 107 for n = 6, one order of magnitude more sensitive than the most recent free neutron limit for intermediate n. Similar experiments can explore the full parameter range for chameleon dark energy in the foreseeable future.}, number={6}, journal={Physical Review D}, publisher={American Physical Society (APS)}, author={Li, K. and Arif, M. and Cory, D. G. and Haun, R. and Heacock, B. and Huber, M. G. and Nsofini, J. and Pushin, D. A. and Saggu, P. and Sarenac, D. and et al.}, year={2016}, month={Mar} }