نتایج جستجو برای: circular dichroism spectroscopy

تعداد نتایج: 236933  

Journal: :Ultramicroscopy 2008
Peter Schattschneider Cécile Hébert Stefano Rubino Michael Stöger-Pollach Ján Rusz Pavel Novák

We describe a new experimental setup for the detection of magnetic circular dichroism with fast electrons (EMCD). As compared to earlier findings the signal is an order of magnitude higher, while the probed area could be significantly reduced, allowing a spatial resolution of better than 40 nm. A simplified analysis of the experimental results is based on the decomposition of the mixed dynamic ...

2017
Jun Okabayashi Tomohiro Koyama Motohiro Suzuki Masahito Tsujikawa Masafumi Shirai Daichi Chiba

We used x-ray absorption spectroscopy and x-ray magnetic circular dichroism to investigate the effects of inserting Cu into Co/Pt interfaces, and found that a 0.4-nm-thick inserted Cu layer showed perpendicularly magnetized properties induced by the proximity effect through the Co and Pt layers. The dependence of the magnetic properties on the thickness of the Cu layers showed that the proximit...

Journal: :Biochemical Society transactions 2008
Stephen J Bingham Daniel Wolverson Andrew J Thomson

The simultaneous excitation of paramagnetic molecules with optical (laser) and microwave radiation in the presence of a magnetic field can cause an amplitude, or phase, modulation of the transmitted light at the microwave frequency. The detection of this modulation indicates the presence of coupled optical and ESR transitions. The phenomenon can be viewed as a coherent Raman effect or, in most ...

Journal: :Nanoscale 2014
Amélie Juhin Alberto López-Ortega Marcin Sikora Claire Carvallo Marta Estrader Sònia Estradé Francesca Peiró Maria Dolors Baró Philippe Sainctavit Pieter Glatzel Josep Nogués

Core-shell nanoparticles attract continuously growing interest due to their numerous applications, which are driven by the possibility of tuning their functionalities by adjusting structural and morphological parameters. However, despite the critical role interdiffused interfaces may have in the properties, these are usually only estimated in indirect ways. Here we directly evidence the existen...

2016
Surendra Singh J. W. Freeland M. R. Fitzsimmons H. Jeen A. Biswas

Mixed-valence manganese oxides present striking properties like the colossal magnetoresistance, metal-insulator transition (MIT) that may result from coexistence of ferromagnetic, metallic and insulating phases. Percolation of such phase coexistence in the vicinity of MIT leads to first-order transition in these manganites. However the length scales over which the electronic and magnetic phases...

Journal: :Nucleic acids research 2002
Anna Aviñó Miriam Frieden Juan Carlos Morales Beatriz García de la Torre Ramón Güimil García Ferran Azorín José Luis Gelpí Modesto Orozco Carlos González Ramon Eritja

Parallel-stranded hairpins with a polypyrimidine sequence linked to a complementary purine carrying 8-aminopurines such as 8-aminoadenine, 8-aminoguanine and 8-aminohypoxanthine bind polypyrimidine sequences complementary (in an antiparallel sense) to the purine part by a triple helix. The relative stabilities of triplexes were assessed by UV-absorption melting experiments as a function of pH a...

2012
Hua-Zhang Zhao Qian Du Zhen-Shan Li Qin-Zheng Yang

Multi-walled carbon nanotube (MWCNT)-modified electrodes can promote the direct electron transfer (DET) of cytochrome c (Cyt c). There are several possible mechanisms that explain the DET of Cyt c. In this study, several experimental methods, including Fourier transform infrared spectroscopy, circular dichroism, ultraviolet-visible absorption spectroscopy, and electron paramagnetic resonance sp...

2016
Xiaojun Wei Takeshi Tanaka Yohei Yomogida Naomichi Sato Riichiro Saito Hiromichi Kataura

Experimental band structure analyses of single-walled carbon nanotubes have not yet been reported, to the best of our knowledge, except for a limited number of reports using scanning tunnelling spectroscopy. Here we demonstrate the experimental determination of the excitonic band structures of single-chirality single-walled carbon nanotubes using their circular dichroism spectra. In this analys...

Journal: :Molecular bioSystems 2013
Soumitra Hazra Maidul Hossain Gopinatha Suresh Kumar

Berberine, palmatine and coralyne, the isoquinoline alkaloids distributed in many botanical families, are extensively investigated due to their potential therapeutic actions and clinical utilities. In this work, their binding characteristics to hemoglobin (Hb) were studied by UV-vis absorption spectroscopy, fluorescence spectroscopy, circular dichroism spectroscopy, isothermal calorimetric titr...

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