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Selim, Mahmoud M.,Althobaiti, Saad,Yahia, I.S.,Mohammed, Ibtisam M.O.,Hussin, Amira M.,Mohamed, Abdel-Baset A. Techno-Press 2022 Advances in nano research Vol.12 No.5
The present work is an attempt to study the vibration analysis of the single-walled carbon nanotubes (SWCNTs) under the effect of the surface irregularity using Donnell's model. The surface irregularity represented by the parabolic form. According to Donnell's model and three-dimensional elasticity theory, a novel governing equations and its solution are derived and matched with the case of no irregularity effects. To understand the reaction of the nanotube to the irregularity effects in terms of natural frequency, the numerical calculations are done. The results obtained could provide a better representation of the vibration behavior of an irregular single-walled carbon nanotube, where the aspect ratio (L/d) and surface irregularity all have a significant impact on the natural frequency of vibrating SWCNTs. Furthermore, the findings of surface irregularity effects on vibration SWCNT can be utilized to forecast and prevent the phenomena of resonance of single-walled carbon nanotubes.
Surface Modification of Magnetites Using Maltotrionic Acid and Folic Acid for Molecular Imaging
Selim, K.M.Kamruzzaman,Lee, Joo-Hee,Kim, Sun-Jung,Xing, Zhicai,Kang, Inn-Kyu,Chang, Yong-Min,Guo, Haiqing The Polymer Society of Korea 2006 Macromolecular Research Vol.14 No.6
Highly hydrophilic, uniform, superparamagnetic and nontoxic maltotrionic acid (MA)-coated magnetite nano-particles (MAM) were prepared and characterized by TEM, DLS, XRD and VSM. MA was used to improve the biocompatibility, monodispersity and non-specific intracellular uptake of nanoparticles. Folic acid (FA) was subsequently conjugated to the MAM to preferentially target KB cells (cancer cells) that have folate receptors expressed on their surfaces and to facilitate nanoparticles in their transit across the cell membrane. Finally, fluorescence isothiocyanate (FITC) was added to the nanoparticles to visualize the nanoparticle internalization into KB cells. After the cells were cultured in a media containing the MAM and MAM-folate conjugate (FAMAM), the results of fluorescence and confocal microscopy showed that both types of nanoparticles were internalized into the cells. Nevertheless, the amount of FAMAM uptake was higher than that of MAM. This result indicated that nanoparticles modified with MA and FA could be used to facilitate the nanoparticle uptake to specific KB cells (cancer cells) for molecular imaging.
Albumin-conjugated Cadmium Sulfide Nanoparticles and their Interaction with KB Cells
Selim, K.M. Kamruzzaman,Kang, Inn-Kyu,Guo, Haiqing The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.6
Cytotoxicity is a severe problem of cadmium sulfide nanoparticles(CSNPs) for use in biological systems. In the present study, mercaptoacetic acid-coated CSNPs were conjugated with bovine serum albumin (BSA) to improve biocompatibility. The surface properties of the CSNPs and albumin-conjugated CSNPs (ACSNPs) were characterized by XRD, UV, FTIR, EA, TEM and DLS. Human breast cancer cells (KB cells) were then cultured in the presence of the nanoparticles to evaluate the cytotoxicity of CSNPs and ACSNPs. Finally, the fluorescence intensity of the nanoparticles' aqueous solution was examined using a fluorescence spectrometer. The results showed that the cell compatibility and fluorescence intensity of ACSNPs were higher than those of CSNPs. The strongly luminescent features of the biocompatible ACSNPs are promising for use in biological fields such as cellular labeling, intracellular tracking and molecular imaging.
Precipitation–deposition assisted fabrication and characterization of nano-sized zinc manganite
N.M. Deraz,Ahmed A. Abdeltawab,M.M. Selim,O. El-Shafey,A.A. El-Asmy,Salem S Al-Deyab 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Catalytic and structural investigations of nano-sized zinc manganite (ZnMn2O4) powders have been determined. These manganites were prepared by precipitation–deposition route followed by heating at 400, 600, and 800℃. The final products were characterized X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray (EDX). The catalytic activity of the as prepared systems was measured by the hydrogen peroxide decomposition in aqueous solution over the solid surface at 30–50℃. The results showed that the calcination temperature affects the different characteristics of the investigated solids.
Kamruzzaman Selim, K.M.,Park, Mi Jin,Kim, Hong Mi,Kang, Inn Kyu Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.342-343 No.-
<P>In the present study, superparamagnetic maltotrionic acid-coated magnetite nanoparticles (MAM) were surface modified with doxorubicin (DOX) and RGD peptide to improve their intracellular uptake, ability to target tumor cells and antitumer effect. RGD was added to the distal end of MAM aiming to construct an enhanced tumor targeting delivery system. To test its targeting effect, DOX, a widely used anticancer drug, was immobilized on the RGD-modified magnetite nanoparticles. DOX-coated magnetite nanoparticles were also prepared as a control. KB cell culture experiment showed that both DOX-modified nanoparticles and DOX-RGD peptide-modified magnetite nanoparticles (DRMAM) were internalized into the cells. But the uptake amount of DRMAMs was higher than that of DOX-modified nanoparticles. This result indicates that DRMAMs have a great potential to be used as contrast agent and antitumor medicine.</P>
Global Civil Society and the Egyptian 2011 Uprising: Assessing the Boomerang Effect
( Gamal M Selim ) 부산외국어대학교 지중해연구소 2014 The Mediterranean Review Vol.7 No.2
The Arab Spring refers to the series of mass uprisings that swept the Arab world in December 2010 and beyond. It resulted in regime changes and mass domestic turmoil across the region. Several factors have been used to account for the Arab Spring, such as domestic despotism and corruption, the impact of social media, and external pressures. This article purports to assess the transnational dimension of the Arab Spring through an examination of the role of global civil society, represented in international human rights groups, in the march toward the Egyptian January 2011 uprising.
Kamruzzaman Selim, K M,Xing, Zhi-Cai,Guo, Haiqing,Kang, Inn-Kyu Chapman and Hall ; Kluwer Academic Publishers 2009 Journal of materials science, Materials in medicin Vol.20 No.9
<P>In the current study, beta-galactose-carrying lactobionic acid (LA) was conjugated on the surface of mercaptoacetic acid-coated cadmium sulfide nanoparticles (CSNPs) to ensure specific recognition of liver cells (hepatocytes) and to enhance biocompatibility. Maltotrionic acid-coated CSNPs (MCSNPs) were also prepared for use as a control. The results showed that LA-immobilized CSNPs (LCSNPs) were selectively and rapidly internalized into hepatocytes and emitted more intense fluorescence images as well as demonstrated increased biocompatible behavior in vitro than those of CSNPs and MCSNPs. Furthermore, the uptake amount of LCSNPs into hepatocytes was higher than that of CSNPs and MCSNPs. All these results indicate that LCSNPs may find ever-growing applications in biological labels and detection or contrast agents in life science and medical diagnostics.</P>