نتایج جستجو برای: gold nanoparticle

تعداد نتایج: 109826  

Journal: :international journal of bio-inorganic hybrid nanomaterials 0

metal nanoshells consists of a dielectric core surrounded by a thin noble metal shell, possess unique optical properties that render nanoshells attractive for use in different technologies. this paper reports a facile method for growth of small gold nanoparticles on the functionalized surface of larger silica nanoparticles. mono-dispersed silica particles and gold nanoparticles were prepared by...

2012
Hui Yang Cuiji Sun Zhenlin Fan Xin Tian Liang Yan Libo Du Yang Liu Chunying Chen Xing-jie Liang Gregory J. Anderson Jeffrey A. Keelan Yuliang Zhao Guangjun Nie

Nanoparticle exposure in pregnancy may result in placental damage and fetotoxicity; however, the factors that determine fetal nanoparticle exposure are unclear. Here we have assessed the effect of gestational age and nanoparticle composition on fetal accumulation of maternally-administered nanomaterials in mice. We determined the placental and fetal uptake of 13 nm gold nanoparticles with diffe...

Journal: :Optics letters 2013
N V Tcherniega K I Zemskov V V Savranskii A D Kudryavtseva A Y Olenin G V Lisichkin

In this Letter we report on experimental observation of stimulated low-frequency Raman scattering (SLFRS) in gold and silver nanoparticle suspensions excited by 20 ns ruby laser pulses, SLFRS propagated in forward and backward directions with a maximum conversion efficiency up to 20%. Frequency shift for silver nanoparticle suspension was found to be 0.33 THz and for gold nanoparticle suspensio...

2013
Jonathan G. Heddle

This review gives a brief summary of the field of gold nanoparticle interactions with biological molecules, particularly those with possible catalytic relevance. Gold nanoparticles are well known as catalysts in organic chemistry but much is unknown regarding their potential as catalysts of reactions involving biological molecules such as protein and nucleic acids. Biological molecules may be t...

2007
Jennifer A. Dougan Camilla Karlsson W. Ewen Smith Duncan Graham

Metallic nanoparticles of gold functionalized with oligonucleotides conventionally use a terminal thiol modification and have been used in a wide range of applications. Although readily available, the oligonucleotide-nanoparticle conjugates prepared in this way suffer from a lack of stability when exposed to a variety of small molecules or elevated temperatures. If silver is used in place of go...

mina eslamifar, nastaran mansour,

In this work, thermo-optical properties of gold nanoparticle colloids are studied using continuous wave (CW) laser irradiation at 532 nm. The nanoparticle colloids are fabricated by 18 ns pulsed laser ablation of pure gold plate in the distilled water. The formation of the nanoparticles has been evidenced by optical absorption spectra and transmission electron microscopy. The nonlinear optical ...

Journal: :international journal of nano dimension 0
m. k. otoufi department of physics, faculty of science, ferdowsi university of mashhad, mashhad, iran. n. shahtahmasebebi department of physics, faculty of science, ferdowsi university of mashhad, mashhad, iran. a. kompany centre of nanoresearch, ferdowsi university of mashhad, mashhad, iran. e. goharshadi department of chemistry, faculty of science, ferdowsi university of mashhad, mashhad, iran.

metal nanoshells consists of a dielectric core surrounded by a thin noble metal shell, possess unique optical properties, which render nanoshells attractive for use in different technologies. this paper reports a facile method for growth of small gold nanoparticles on the functionalized surface of larger silica nanoparticles. mono-dispersed silica particles and gold nanoparticles were prepared ...

Journal: :Bioconjugate chemistry 2006
Chiamaka Agbasi-Porter Jessica Ryman-Rasmussen Stefan Franzen Daniel Feldheim

The capture of T7 RNA polymerase using double-stranded promoter DNA on the surface of gold nanoparticles has been demonstrated. The competitive binding and inhibition of T7 RNA polymerase due to specific interactions on the nanoparticle surface represents a transcription factor decoy approach in a model system. The efficiency of inhibition was determined for various nanoparticle sizes, surface ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2005
Christopher J Ackerson Michael T Sykes Roger D Kornberg

Glutathione monolayer-protected gold clusters were reacted by place exchange with 19- or 20-residue thiolated oligonucleotides. The resulting DNA/nanoparticle conjugates could be separated on the basis of the number of bound oligonucleotides by gel electrophoresis and assembled with one another by DNA-DNA hybridization. This approach overcomes previous limitations of DNA/nanoparticle synthesis ...

2018
Sirirat Wachiralurpan Thayat Sriyapai Supatra Areekit Pichapak Sriyapai Suphitcha Augkarawaritsawong Somchai Santiwatanakul Kosum Chansiri

Citation: Wachiralurpan S, Sriyapai T, Areekit S, Sriyapai P, Augkarawaritsawong S, Santiwatanakul S and Chansiri K (2018) Rapid Colorimetric Assay for Detection of Listeria monocytogenes in Food Samples Using LAMP Formation of DNA Concatemers and Gold Nanoparticle-DNA Probe Complex. Front. Chem. 6:90. doi: 10.3389/fchem.2018.00090 Rapid Colorimetric Assay for Detection of Listeria monocytogene...

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