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Stem Cell Tracing Through MR Molecular Imaging
Rasoul Yahyapour,Bagher Farhood,Ghazale Graily,Abolhasan Rezaeyan,Saeed Rezapoor,Hamid Abdollahi,Mohsen Cheki,Peyman Amini,Hengameh Fallah,Masoud Najafi,Elahe Motevaseli 한국조직공학과 재생의학회 2018 조직공학과 재생의학 Vol.15 No.3
Stem cell therapy opens a new window in medicine to overcome several diseases that remain incurable. It appears such diseases as cardiovascular disorders, brain injury, multiple sclerosis, urinary system diseases, cartilage lesions and diabetes are curable with stem cell transplantation. However, some questions related to stem cell therapy have remained unanswered. Stem cell imaging allows approval of appropriated strategies such as selection of the type and dose of stem cell, and also mode of cell delivery before being tested in clinical trials. MRI as a non-invasive imaging modality provides proper conditions for this aim. So far, different contrast agents such as superparamagnetic or paramagnetic nanoparticles, ultrasmall superparamagnetic nanoparticles, fluorine, gadolinium and some types of reporter genes have been used for imaging of stem cells. The core subject of these studies is to investigate the survival and differentiation of stem cells, contrast agent’s toxicity and long term following of transplanted cells. The promising results of in vivo and some clinical trial studies may raise hope for clinical stem cells imaging with MRI.
Mahdi Safi,Fahime Gheisar,Farhood Najafi,Behzad Shirkavand Hadavand 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12
This study aimed to investigate the capability of two silicon-based resins, namely Polydimethylsiloxane (PDMSiA) and Poly (dimethyl/diphenyl siloxane) modified with amino groups (PDMDPhSiA), to induce a visible shade-darkening effect when applied as finishing agents on black-dyed polyester and cotton fabrics. The process involved the utilization of deepening agents with a low refractive index to achieve this visual darkening effect. The analysis encompassed several aspects. FTIR spectroscopy was employed to characterize the chemical structure of the synthetic products. The refractive indexes were quantified using the Swaneopeol method. To gauge the effectiveness of the treatment, the color depth of the treated fabrics was assessed using parameters such as color yield (K/S) and the ratio of the difference in lightness (DL*) to the overall color difference (ΔEab*). Moreover, the study delved into the fastness properties of the dyed fabrics after the finishing process. Comparatively, the results highlighted that the use of PDMSiA resin led to an enhanced color depth in the finished fabrics, outperforming the effects of PDMDPhSiA resin. The evaluation of color fastness demonstrated significant improvements across the board, with all samples achieving a grade of 5 or higher. The study determined that the optimal conditions for applying both resins involved a concentration of 20%, a pick-up rate of 85%, and a curing temperature of 180 °C. These conditions yielded the most favorable outcomes in terms of achieving the desired shade-darkening effect on the dyed fabrics.
PEG-Poly(fumaric-sebacic acids)-PEG 삼중 블록 공중합체로 수용액에서 만들어진 폴리머솜의 분석과 방출특성
Pounehs. Pourhosseini,Ali A Saboury,Farhood Najafi,Adeleh Divsalar,Mohammad N Sarbolouki 한국고분자학회 2013 폴리머 Vol.37 No.3
Polymersomes made of biodegradable triblock copolymers based on poly(fumaric acid-co-sebacoyl chloride)/ PEG (PEG-co-P(FA/SC)-co-PEG) were prepared and studied in aqueous solutions. TEM confirmed the formation of vesicles in aqueous media. Aggregation behavior of the copolymers was studied by fluorescence spectroscopy of 8-anilino- 1-naphthalenesulfonic acid, and the critical aggregation concentration (c.a.c.) of the copolymer was found to be ~26.2 μM indicating desirable stability of the vesicles. Dynamic light scattering revealed that the size of the vesicles was distributed within the range of 170-270 nm. Turbidity measurements confirmed the relative short-term stability of the polymersomes. Carboxyfluorescein, a hydrophilic compound, was simply encapsulated in the vesicles during polymersome preparation. The release of encapsulant from the polymersomes at 25 and 37 oC lasted about 3 weeks, and the rate of release followed a first-order kinetics. The release is speculated to be primarily carried out through diffusion. These results confirm that these polymersomes are promising as controlled-release carriers of various drugs.
Synthesis of urethane sodium carboxylate and its dye removal ability from single system
Niyaz Mohammad Mahmoodi,Omeleila Masrouri,Farhood Najafi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Urethane sodium carboxylate (USC) was synthesized and its dye removal ability was investigated. USC characteristics were studied using FTIR and SEM. Basic Blue 41 (BB41), Basic Red 18 (BR18), and Basic Violet 16 (BV16) were used. The effect of adsorbent dosage, dye concentration and salt on dye removal was evaluated. Adsorption kinetics followed pseudo-second order. The USC adsorption capacity was 474, 538 and 298 mg/g for BB41, BR18 and BV16, respectively. Adsorption isotherm followed with Langmuir isotherm. The results showed that the USC might be a suitable adsorbent to remove dyes from colored wastewater.
Removal of azo dye from aqueous solution using an anionic polymeric urethane absorbent (APUA)
Azam Pirkarami,Mohammad Ebrahim Olya,Farhood Najafi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
This paper is a report on an original research which investigated the effect of a number of experimentalparameters on the removal of Food Red 17 (FR17) from an aqueous solution using anionic polymericurethane absorbent (APUA) as an adsorbent. The optimum value of adsorbent dose was found to be35 mg L 1. Further, maximum dye removal took place at pH 3 and 45 8C. The fourth parameter, stirringthe solution during the treatment, also resulted in significant removal improvement. The amount of FR17adsorbed on APUA surface was quantified using the Langmuir equation. UV irradiation was also found tohave a positive effect on the removal process. The efficiency of the treatment was verified using FT-IRspectrometry results for APUA, FR17, and APUA-FR17. Finally, the adsorbent was subjected to SEMcharacterization.
Yekefallah, Vahideh,Soleimani-Gorgani, Atasheh,Rouhani, Shohre,Najafi, Farhood The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.1
This paper reports the preparation of an ink-jet printed flexible electrochromic device based on a water-soluble viologen-functionalized dendrimer. Polyamidoamine (PAMAM) dendrimers were modified with different concentrations of 1-1 bis(propylamine)-4,4'-bipyridylium dibromides to obtain solution-processable electrochromic materials (K1/2 and K1). FTIR, NMR, and elemental analyses are used to characterize synthesized viologens. Moreover, their electrochemical properties were investigated using cyclic voltammetry in an electrolyte solution consisting of 0.1 M HCl to find the optimum viologens. The low-cost ink-jet printer was used to print the prepared water-soluble electrochromic inks onto the ITO coated PET substrate to form desired transparent patterns. The electrolyte was applied on the printed electrochromic ink to make a sandwich with another ITO coated PET to prepare the electrochromic devices (ECD). By applying an electrical potential (0 to -2 V), the transparent ECD's color changed from colorless to blue. The color changes for the optimum ECD (K1), which had more viologen units on the dendrimer, was accompanied by an optical contrast of 47% and 311.5 ㎠C-1 coloration efficiency at 600 nm.
Synthesis of cationic polymeric adsorbent and dye removal isotherm, kinetic and thermodynamic
Niyaz Mohammad Mahmoodi,Unes Sadeghi,Afshin Maleki,Bagher Hayati,Farhood Najafi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Poly(quaternary ammonium salt) (PQAS) as a cationic polymeric adsorbent was synthesized and characterized by FTIR. Isotherm, kinetic and thermodynamic of dye removal from single and binary systems was investigated. Acid Blue 25 (AB25) and Acid Red 18 (AR18) were used. The effect of operational parameters (adsorbent dose, pH, dye concentration and salt) on dye removal was studied. The dye removal followed the Langmuir isotherm and pseudo-first order kinetics. The adsorbent maximum dye adsorption capacity (Q0) was 2000 and 1667 mg/g for AB25 and AR18, respectively. The thermodynamic data showed that dye adsorption was spontaneous, endothermic, and a physisorption reaction.