排序方式: 共有74条查询结果,搜索用时 187 毫秒
31.
Raheleh Bakhshi Ebrahim Vasheghani‐Farahani Hamid Mobedi Ahmad Jamshidi Mazyar Khakpour 《先进技术聚合物》2006,17(5):354-359
Biodegradable in situ forming drug delivery systems for naltrexone release are promising for post‐treatment of drug addicts. The effect of two different additives, glycerol and ethyl heptanoate, on the naltrexone hydrochloride release and solvent removal from a poly(DL ‐lactide‐co‐glycolide) (PLGA) injectable implant is presented in this article. The experimental results showed that the in vitro initial release of the drug was decreased in the presence of these additives. Ethyl heptanoate was, however, more effective than glycerol and increasing the amount of additives in PLGA solution up to 5% (w/w) resulted in a decrease of initial naltrexone release rate up to 50%. The morphological evaluation of implants using scanning electron microscopy indicated that the additives generated a less porous structure together with a finger‐like to sponge‐like transition. The solvent removal profiles of injectable implants, which can be well described by thermogravimetric and morphological analysis, were in good agreement with drug release profiles. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
32.
Applications of Mathematics - Recently, Na Huang and Changfeng Ma in (2016) proposed two kinds of typical practical choices of the PPS method. In this paper, we extrapolate two versions of the PPS... 相似文献
33.
The magnetic nanoparticles supported silica sulfuric acid was used as an efficient catalyst for the synthesis of pyrimido[4,5-b]quinolines and indeno fused pyrido[2,3-d]pyrimidines in water. The desired products were obtained in excellent yields. Fe3O4@SiO2-SO3H was readily recovered using an external magnet and could be reused several times without significant loss of reactivity. 相似文献
34.
Javad Safaei-Ghomi Raheleh Teymuri Hossein Shahbazi-Alavi Abolfazl Ziarati 《中国化学快报》2013,24(10):921-925
A highly efficient and general method for the synthesis of polyfunctionalized 4H-pyrans is established through a one-pot multicomponent cyclocondensation of aromatic aldehydes with CH acids, malononitrile and ethyl acetoacetate using nano silica supported tin (Ⅱ) chloride as a catalyst. In this method SnCl2/nano SiO2 was used as green and reusable catalyst. Excellent yields, short reaction times, simple workup, and inexpensiveness and commercially availability of the catalyst are the advantages of this method. 相似文献
35.
The reversible electrochemical modulation of fluorescence and selective sensing of ascorbic acid has been achieved using a DCIP-CA-CdTe QD system. Ascorbic acid could be detected over a linear range from 2.33 μM to 56.49 μM, with a detection limit of 0.50 μM. 相似文献
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Hashem Sharghi Sakineh Ebrahimpourmoghaddam Raheleh Memarzadeh Sirous Javadpour 《Journal of the Iranian Chemical Society》2013,10(1):141-149
Tin oxide (SnO2) nanoparticles were synthesized by modified thermal decomposition process. Taguchi analysis was used and three important synthetic factors, molar concentration ratio of [NaNO3]/[SnCl4], temperature and time of calcinations, which affect the size of SnO2 particles, were studied. The optimal conditions were determined using Taguchi robust design method and nano-sized SnO2 particles (~2 nm) were obtained. Nanoparticles were characterized by X-ray diffraction, transmission electron microscopy and UV–visible spectroscopy techniques. The results show that tin oxide nanoparticles could be one of the most active and reusable catalysts in the Knoevenagel condensation. Different active methylene group compounds and diverse range of aldehydes were chosen to react in the presence of tin oxide nanoparticles at ambient temperature at solvent-free condition (SFC) with excellent isolated yields. 相似文献
38.
Li DW Qin LX Li Y Nia RP Long YT Chen HY 《Chemical communications (Cambridge, England)》2011,47(30):8539-8541
We demonstrate that the coupling system of negatively capped CdSe/ZnS QDs with an oxidized Cytochrome c (Cyt c) is capable of the fluorescent imaging of a superoxide radical (O(2)˙?) with high sensitivity and specificity in living cells, without interference from other Reactive Oxygen Species (ROS) or relevant intracellular components. 相似文献
39.
The Cohen–Macaulay locus of any finite module over a noetherian local ring A is studied, and it is shown that it is a Zariski-open subset of Spec A in certain cases. In this connection, the rings whose formal fibres over certain prime ideals are Cohen–Macaulay are studied. 相似文献
40.
Algebraic and combinatorial properties of a monomial ideal are studied in terms of its associated radical ideals. In particular, we present some applications to the symbolic powers of square-free monomial ideals. 相似文献