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排序方式: 共有110条查询结果,搜索用时 125 毫秒
91.
S. Muthukumaran M. Muthusamy 《Journal of Materials Science: Materials in Electronics》2012,23(9):1647-1656
The ternary CdS1?xSex alloy thin films with the nominal composition of x?=?0.2, 0.4, 0.6 and 0.8 have been synthesized on glass substrate by chemical bath deposition (CBD) method at 80°C from aqueous solution. Crystalline phases and optical absorption of the films have been studied by X-ray diffraction and UV–visible spectrophotometer. Elemental composition of the CdS1?xSex films was studied by the energy dispersive X-ray (EDX) analysis. The optical absorption and transmission studies revealed that CdS1?xSex films had direct allowed transition with band gap energy decreased from 2.28 to 1.92?eV as thickness varied from 762.4 to 621.2?nm. The average crystalline size was calculated from X-ray line broadening and it is increased from 12.71 to 14.67?nm for x?=?0.2–0.8 which was confirmed by SEM studies. The substitution of Se concentrations into the Cd–S and Cd–S–Se lattice is confirmed by the increase of lattice parameters, FTIR and photoluminescence studies. The broad variation in the band gap of CdS1?xSex thin films have potential applications in the field of optoelectronic devices. 相似文献
92.
Subramanian S Ayyasamy S Selvin PC Reddy MV Chowdari BV Heller N Dorai A Muthusamy H 《Journal of nanoscience and nanotechnology》2012,12(1):737-742
Lithium trivanadate (Li(1+x)V3O8) nanorods have been synthesized by the simple polymer precursor route using the polymer, polyvinyl pyrrolidone (PVP) as the complexing agent. Thermal behavior of the precursor has been studied by the differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and differential thermal analysis (DTA) techniques. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) studies confirm the formation of the compound. High resolution scanning electron microscopy (HRSEM) analysis reveals the synthesized Li1.2V3O8 particles to be nanorods with an average diameter of 50 nm. 相似文献
93.
Lee H Lytton-Jean AK Chen Y Love KT Park AI Karagiannis ED Sehgal A Querbes W Zurenko CS Jayaraman M Peng CG Charisse K Borodovsky A Manoharan M Donahoe JS Truelove J Nahrendorf M Langer R Anderson DG 《Nature nanotechnology》2012,7(6):389-393
Nanoparticles are used for delivering therapeutics into cells. However, size, shape, surface chemistry and the presentation of targeting ligands on the surface of nanoparticles can affect circulation half-life and biodistribution, cell-specific internalization, excretion, toxicity and efficacy. A variety of materials have been explored for delivering small interfering RNAs (siRNAs)--a therapeutic agent that suppresses the expression of targeted genes. However, conventional delivery nanoparticles such as liposomes and polymeric systems are heterogeneous in size, composition and surface chemistry, and this can lead to suboptimal performance, a lack of tissue specificity and potential toxicity. Here, we show that self-assembled DNA tetrahedral nanoparticles with a well-defined size can deliver siRNAs into cells and silence target genes in tumours. Monodisperse nanoparticles are prepared through the self-assembly of complementary DNA strands. Because the DNA strands are easily programmable, the size of the nanoparticles and the spatial orientation and density of cancer-targeting ligands (such as peptides and folate) on the nanoparticle surface can be controlled precisely. We show that at least three folate molecules per nanoparticle are required for optimal delivery of the siRNAs into cells and, gene silencing occurs only when the ligands are in the appropriate spatial orientation. In vivo, these nanoparticles showed a longer blood circulation time (t(1/2) ≈ 24.2 min) than the parent siRNA (t(1/2) ≈ 6 min). 相似文献
94.
Fear appeals are often used in public health campaigns in Africa to prevent further spread of HIV/AIDS. Based on the extended parallel processing model framework (K. Witte, 1991), this research assessed the impact of such messages in a high-fear situation. A 2 (high threat, low threat) × 2 (high efficacy, no efficacy) experiment with a no-message offset control and efficacy-only conditions tested several predictions. Participants demonstrated high preexisting fear about HIV/AIDS. As a likely consequence, statistical equivalence tests indicated that messages' threat levels had little impact on perceptions of fear or on outcome measures such as attitudes, intentions, or behaviors. It is concluded that the use of fear appeals to persuade audience with high levels of preexisting fear is ill-advised and ineffective. 相似文献
95.
Aliphatic polyesters containing pendent unsaturation were synthesized by the polycondensation of a diol, dicarboxylic acid and glycidyl methacrylate. Grafting methacrylic acid (MAA) resulted in graft copolymers containing polyester backbone and MAA grafts. Depending on composition, the polymers swelled extensively and eroded or dissolved at near neutral pH but remained in collapsed state at acidic pH. Three representative drugs differing in solubility, viz., Diltiazem hydrochloride (DH), Indomethacin (IM) and Verapamil hydrochloride (VH) were released at constant rate from tablets made by compressing spray-dried microparticles. The release of DH at constant rate has been attributed to increase in diffusion coefficient of the drug from the swollen layer of matrix. The release of IM and VH at constant rate was governed by erosion and was enhanced in matrices which undergo dissolution. The release rate was enhanced with increasing MAA content and the frequency of grafts along the polyester backbone. Once a day dosage forms for drugs differing in solubility have been developed using a single polymer matrix which is easy to manufacture. 相似文献
96.
Athianna Muthusamy Munusamy Arunkumar Nagarajan Kannapiran Sher Singh Meena S. M. Yusuf 《Journal of Materials Science: Materials in Electronics》2017,28(21):15754-15761
Poly(m-phenylenediamine) (PmPD)/NiFe2O4 nanocomposites were synthesized by in situ oxidative polymerization containing two different ratios of NiFe2O4 nanoparticles (10 and 20%). Dielectric studies of PmPD/NiFe2O4 nanocomposites were carried out at different temperature and frequency. Dielectric constants of PmPD/NiFe2O4 nanocomposites vary with the concentration of NiFe2O4 nanoparticles. Magnetic measurements of NiFe2O4 nanoparticles and PmPD/NiFe2O4 nanocomposites showed that they have ferromagnetic behaviour at room temperature. The XRD patterns of PmPD/NiFe2O4 nanocomposites are confirming the incorporation of NiFe2O4 nanoparticles into PmPD polymer. Room temperature Mössbauer spectrum of NiFe2O4 nanoparticles demonstrated that the Fe is in 3+ oxidation state with cubic structure. The SEM image of PmPD shows sphere like morphology. TGA suggest that thermal stability of PmPD/NiFe2O4 nanocomposites is greater than PmPD. 相似文献
97.
Kaliyaperumal Viswanathan Rajasekar vaiyamalai Diviya Bharathi babu Murugaiyan Latha Mala Priyadharshini Muthusamy Raman Gopal Dhinakarraj 《IET nanobiotechnology / IET》2018,12(8):1097
In this study, the ketoconazole‐conjugated zinc oxide (ZnO) nanoparticles were prepared in a single‐step approach using dextrose as an intermediate compound. The physical parameters confirmed the drug conjugation with ZnO and their size was around 70–75 nm. The drug loading and in vivo drug release studies indicated that the –CHO group from the dextrose increase the drug loading up to 65% and their release kinetics were also studied. The anti‐fungal studies indicated that the prepared nanoparticles exhibit strong anti‐fungal activity and the minimum concentration needed is 10 mg/ml. The nanoparticles loaded semi‐solid gel was prepared using carbopol, methylparaben, propyl paraben and propylene glycol. The in vitro penetration of the ketoconazole‐conjugated nanoparticles was studied using the skin. The results indicated that the semi‐solid gel preparations influenced the penetration and also favoured the accumulation into the skin membrane. The veterinary clinical studies indicated that the prepared gel is highly suitable for treatment of Malassezia.Inspec keywords: II‐VI semiconductors, skin, biomedical materials, antibacterial activity, wide band gap semiconductors, drug delivery systems, nanomedicine, drugs, diseases, gels, nanofabrication, nanoparticles, zinc compounds, biomembranes, veterinary medicineOther keywords: strong anti‐fungal activity, propyl paraben, propylene glycol, semisolid gel preparations, skin membrane, veterinary clinical studies, semisolid formulation, skin disease, ketoconazole‐conjugated zinc oxide nanoparticles, single‐step approach, physical parameters, drug conjugation, drug loading, release kinetics, dextrose, in vivo drug release studies, carbopol, methylparaben, in vitro penetration, Malassezia, ZnO 相似文献
98.
M. Muthusamy S. Muthukumaran 《Journal of Materials Science: Materials in Electronics》2013,24(7):2277-2286
Cd0.6Co0.4S thin films have been deposited successfully on glass plates using chemical bath deposition method at 80° C by changing the time of deposition as a controlling parameter from 10 to 30 h. X-ray diffraction measurement shows the Co substitution of cadmium sulphide (CdS) system with hexagonal structure having the average crystalline between 1.79 and 2.13 nm. Energy dispersive X-ray spectrum reveals the presence of Co in the Cd–S lattice. The change in lattice parameters is demonstrated by the crystal size, bond length, micro-strain and the quantum confinement effect. The band gap energy is varied from 2.44 to 2.66 eV by changing the deposition times from 10 to 30 h which is useful to design a suitable window material in fabrication for solar cells. The presence of functional groups and the chemical bonding is confirmed by Fourier transform infrared spectra. The presence and the major blue shift of strong blue and red bands were demonstrated by photoluminescence spectra. The intensive emission properties of the Cd0.6Co0.4S thin films show a great potential for use as nano-scaled optoelectronic intensive light emitters under different deposition time. 相似文献
99.
Muthusamy Karthikeyan Rajendran Sandosskumar Raju Radhajeyalakshmi Subramanian Mathiyazhagan Salah Eddin Khabbaz Kulandaivelu Ganesamurthy Balasubramanian Selvi Rethinasamy Velazhahan 《Journal of the science of food and agriculture》2007,87(13):2495-2501
BACKGROUND: The in vitro antifungal activity of zimmu (Allium cepa L. × Allium sativum L.) extract against Aspergillus flavus Link., Fusarium moniliforme Sheld, Curvularia lunata (Wakker) Boedijn and Alternaria alternata (Fr.) Keissler, the fungi associated with grain mold of sorghum, was evaluated. An emulsifiable concentrate (EC) formulation of zimmu extract was prepared and its efficacy in controlling grain mold was tested under field conditions. RESULTS: The leaf extract of zimmu exhibited strong antifungal activity against A. flavus, F. moniliforme, C. lunata and A. alternata and caused in vitro fungal growth inhibition of 73.3%, 71.1%, 70.0% and 74.4%, respectively. Foliar application of zimmu formulation 50 EC at 3 mLL?1 (v/v) concentration 60, 75 and 90 days after sowing significantly reduced the incidence of grain mold and increased the grain weight and grain hardness. A significant reduction in the aflatoxin B1 content in sorghum grains was observed when sorghum plants were sprayed with zimmu formulation 50 EC at 0.3% concentration. Western blot analysis revealed that a thaumatin‐like protein (TLP) a molecular mass of 23 kDa that cross‐reacted with zeamatin antiserum was expressed at higher levels in sorghum grains after treatment with zimmu formulations. CONCLUSION: The leaf extract of zimmu exhibited antifungal activity against sorghum grain mold fungi. The formulated zimmu extract was significantly effective in reducing the grain mold incidence in sorghum under field conditions. This formulated zimmu extract offers a novel alternative for eco‐friendly management of grain mold of sorghum. Copyright © 2007 Society of Chemical Industry 相似文献
100.
Kaliyaperumal Viswanathan Babu Diviya Bharathi Chitra Karuppannan Thiyagarajan Sanjeevi Madan Nithiyanantham Kandasamy Arul Kumar Latha Mala Priyadhershini Murugaiyan Dhinakarraj Gopal Raman Muthusamy 《IET nanobiotechnology / IET》2020,14(1):14
In this study, chlorhexidine (CHX)–silver (Ag) hybrid nanoparticles (NPs) coated gauze was developed, and their bactericidal effect and in vivo wound healing capacities were tested. A new method was developed to synthesise the NPs, wherein Ag nitrate mixed with sodium (Na) metaphosphate and reduced using Na borohydride. Finally, CHX digluconate was added to form the hybrid NPs. To study the antibacterial efficacy of particles, the minimal inhibition concentration and biofilm degradation capacity against Gram‐positive and Gram‐negative bacteria was studied using Escherichia coli and Staphylococcus aureus. The results indicated that the NP inhibited biofilm formation and was bactericidal as well. The gauze was doped with NPs, and its wound healing property was evaluated using mice model. Results indicated that the wound healing process was fastened by using the NPs gauze doped with NPs without the administration of antibiotics.Inspec keywords: nanomedicine, nanoparticles, wounds, silver, cellular biophysics, biomedical materials, nanofabrication, microorganisms, antibacterial activityOther keywords: NPs gauze, antimicrobial wound healing applications, hybrid NPs, chlorhexidine–silver hybrid nanoparticles, CHX, coated gauze, bactericidal effect, minimal inhibition concentration, biofilm degradation capacity, Gram‐negative bacteria, wound healing property, wound healing process, in vivo wound healing capacities, Staphylococcus aureus, Escherichia coli, antibiotics administration, Na borohydride, Ag nitrate mixing, sodium metaphosphate, CHX digluconate, NP inhibited biofilm formation, Ag 相似文献