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11.
The highly reactive 1:1 intermediate generated in the reaction between an alkyl isocyanide and a dialkyl acetylenedicarboxylate is trapped by N-alkyl isatin to yield iminolactones in fairly high yields. 相似文献
12.
Let X denote a specific space of the class of X
α,p
Banach sequence spaces which were constructed by Hagler and the first named author as classes of hereditarily ℓp Banach spaces. We show that for p > 1 the Banach space X contains asymptotically isometric copies of ℓp. It is known that any member of the class is a dual space. We show that the predual of X contains isometric copies of ℓp where 1/p + 1/q = 1. For p = 1 it is known that the predual of the Banach space X contains asymptotically isometric copies of c
0. Here we give a direct proof of the known result that X contains asymptotically isometric copies of ℓ1. 相似文献
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Masoomeh Bayat Avat Arman Taherpour Seyed Mohammad Elahi Thomas Fellowes 《Journal of the Iranian Chemical Society》2018,15(6):1223-1234
Much progress has been made in the treatment of cancer. However, it remains a significant challenge to treat as toxic chemotherapeutic drugs are often poorly tolerated when administered together, limiting the patient’s treatment options. A possible solution to this problem is anchoring drugs on the surface of nanoparticles. These systems have a variety of structures with sizes, shapes and materials which determine loading capacity, cellular targeting and stability. Dendrimers are a class of nanoparticles which have been investigated in this context. In this study, we investigated the functionalization of polyamidoamine (PAMAM) dendrimers with some anticancer medications that suppresses the growth of cancer cells (carmustine, lomustine, semustine and melphalan; 1–4). The possibility of drug release, drug delivery and drug separation by PAMAM was theoretically investigated and discussed. The predicted theoretical method will be interesting to remove the pollutants from the medical solutions by PAMAM dendrimer nanoclusters. The results of the modeling were obtained by MMFF94 and RHF/PM6 methods for all form of the PAMAM–medicines complexes. The obtained results by these two methods were shown same trend of the relative energy surfaces of the complexes of PAMAM–medicines 1–4. 相似文献
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Mohammadhassan Gholami-Shabani Afshin Imani Masoomeh Shams-Ghahfarokhi Zeynab Gholami-Shabani Arezoo Pazooki Azim Akbarzadeh Gholamhossein Riazi Mehdi Razzaghi-Abyaneh 《Journal of the Iranian Chemical Society》2016,13(11):2059-2068
The development of efficient cell-free systems of nanoparticle synthesis using microbial enzymes is a growing field of biological and green chemistry for the supportable improvement in nano-biotechnology. In the present study, we established a cell-free system for producing gold nanoparticles (AuNPs) using a fungal oxidoreductase named sulfite oxidoreductase purified to homogeneity from Fusarium oxysporum. The enzyme was purified by ultrafiltration followed by anion exchange chromatography on DEAE Sephadex A-50 gel, and its molecular weight was determined by gel filtration chromatography on Sephacryl S-300 gel. The purified enzyme had a molecular weight of 346 kDa. It was composed of three subunits of 176, 94 and 76 kDa. Purified enzyme was successfully used for production of gold nanoparticles in a cell-free system. Synthesized gold nanoparticles showed the highest absorbance at 520 nm wavelength as shown by UV–visible spectroscopy. They were spherical in shape with an average size of 20 nm as determined by scanning and transmission electron microscopy and dynamic light scattering. Assessment of the antifungal properties of synthesized nanoparticles by disk diffusion method indicated a potent growth inhibitory activity against all tested human pathogenic yeasts and molds by inhibition zones ranged from 10 to 18 mm. Taken together, our enzymatically established method of nanoparticle synthesis using a purified sulfite oxidoreductase of F. oxysporum can be considered as an efficient tool for generating harmless bioactive gold nanoparticles with potential applications in biology, medicine and industry. 相似文献
18.
Abbas Shockravi Shahram Mehdipour-Ataei Masoomeh Zakeri 《European Polymer Journal》2007,43(2):620-627
A new-type of sulfide containing diacid (1,1′-thiobis(2-naphthoxy acetic acid)) was synthesized from 2-naphthol in three steps. Reaction of 2-naphthol with sulfur dichloride afforded 1,1′-thiobis(2-naphthol) (TBN). 1,1′-Thiobis(2-naphthoxy acetic ester) (TBNAE) was successfully synthesized by refluxing the TBN with methylcholoroacetate in the presence of potassium carbonate. The related diacid was synthesized by basic solution reduction of TBNAE. The obtained diacid was fully characterized and used to prepare novel thermally stable poly(sulfide ether amide)s via polyphosphorylation reaction with different aromatic diamines. The properties of these new polyamides were investigated and compared with similar polyamides. These polyamides showed inherent viscosities in the range of 0.39-0.87 dL g−1 in N,N-dimethylacetamide (DMAc) at 30 °C and at a concentration of 0.5 g dL−1. All the polyamides were readily soluble in a variety of polar solvents such as DMAc and tetrahydrofuran (THF). These polyamides showed glass transition temperature (Tg) between 241-268 °C. Thermogravimetric analysis measurement revealed the decomposition temperature at 10% weight loss (T10) ranging from 441- 479 °C in argon atmosphere. 相似文献
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Mohammad M. Mojtahedi M. Saeed Abaee Mehdieh Samianifard Akram Shamloo Masoomeh Padyab A. Wahid Mesbah Klaus Harms 《Ultrasonics sonochemistry》2013,20(3):924-930
Ultrasonic irradiation was efficiently used for high yield synthesis of monoarylidene derivatives of cyclic systems directly from the reaction of ketone with various aldehydes under solvent-free conditions. Reactions took place rapidly in the presence of catalytic amounts of pyrrolidine, while no significant formation of the undesired bis by-products was observed. Moreover, the procedure was applicable to both homo- and heterocyclic ketones. 相似文献
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In this study, acrylamide (AAm)/aconitic acid (ACA) copolymers were prepared with two different mol% of aconitic acid 4%, 17% and were irradiated with gamma irradiation at different irradiation doses (4 - 25kGy). The percent yield was assigned by gravimetrical method. The effect of irradiation dose, pH and involved amounts of monomers (AAm/ACA) in hydrogels on swelling properties were investigated. The conversion of monomers to hydrogels was 100% at 25kGy. Poly(acrylamide-co-aconitic acid) P(AAm/ACA) hydrogels have been used for the adsorption of some aqueous solutions of dyes such as Methylene Blue (MB) and Safranine-O (S). The hydrogels were swollen in distilled water at pH 3, 5, 7, 8 and in aqueous solutions of dyes. The initial swelling rates of hydrogels are increased by increasing of pH. The effects of concentration of the aqueous solutions of dye and hydrogel composition on the adsorption were investigated. The adsorption is increased and changed depending on the structure of dye and composition of hydrogel. 相似文献