نتایج جستجو برای: X-ray crystallography

تعداد نتایج: 669246  

In this article a review on the definition of the X- ray transform and some ofits applications in Nano crystallography is presented. We shall show that the X- raytransform is a special case of the Radon transform on homogeneous spaces when thetopological group E(n)- the Euclidean group - acts on ℝ2 transitively. First someproperties of the Radon transform are investigated then the relationship ...

2000
M S Smyth J H J Martin

x Ray crystallography is currently the most favoured technique for structure determination of proteins and biological macromolecules. Increasingly, those interested in all branches of the biological sciences require structural information to shed light on previously unanswered questions. Furthermore, the availability of a protein structure can provide a more detailed focus for future research. ...

Journal: :journal of physical & theoretical chemistry 2006
massoud rafizadeh

the synthesis of [cu3o(oac)6(h2o)3]cl.ch3oh.6h2o is described. the x-ray crystallographic study of thecomplex revealed an isosceles triangle of copper atoms with a triply bridging oxo atom nearly in the plane of thetriangle. the coordination sphere around each metal center is close to distorted octahedral and the central{cu3(μ3-o)} core is planar. every two copper atoms were connected to each o...

زرگرشوشتری, مرتضی, کلانترهرمزی, راهیل, موسوی قهفرخی, سیدابراهیم ,

In this paper, Au nanoparticles are synthesized by solution method. The effect of these nanoparticles on the Bi1.6Pb0.4Sr2Ca2Cu3Oy superconductor properties has been investigated. The critical current density, activation energy and room temperature resistivity were measured by the standard four-probe method. The microstructure and morphology of samples have been studied by X-ray diffraction, Sc...

Journal: :Acta crystallographica. Section A, Foundations of crystallography 2008
Xiaodong Zou Sven Hovmöller

The study of crystals at atomic level by electrons - electron crystallography - is an important complement to X-ray crystallography. There are two main advantages of structure determinations by electron crystallography compared to X-ray diffraction: (i) crystals millions of times smaller than those needed for X-ray diffraction can be studied and (ii) the phases of the crystallographic structure...

Journal: :Macedonian Journal of Chemistry and Chemical Engineering 2015

Journal: :Cell 2014
Yigong Shi

Since determination of the myoglobin structure in 1957, X-ray crystallography, as the anchoring tool of structural biology, has played an instrumental role in deciphering the secrets of life. Knowledge gained through X-ray crystallography has fundamentally advanced our views on cellular processes and greatly facilitated development of modern medicine. In this brief narrative, I describe my pers...

Journal: :Zeitschrift für Kristallographie - Crystalline Materials 1972

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