|
|
|
||
|
Last update: prof. RNDr. Marek Procházka, Ph.D. (29.01.2019)
|
|
||
|
Last update: POSPISIL/MFF.CUNI.CZ (05.04.2008)
Difrakční experimenty, principy a využití pro biologii, strukturní analýza s využitím výpočetních metod. |
|
||
|
Last update: doc. RNDr. Miroslav Pospíšil, Ph.D. (29.04.2020)
It is assumed that there will be a maximum of 2 corrective terms for passing the exam. |
|
||
|
Last update: G_F (26.05.2003)
J. Chojnacki : Základy chemické a fyzikální krystalografie, Academia Praha 1979.
V. Valvoda, M. Polcarová, P. Lukáč: Základy strukturní analýzy, Karolinum, Praha, 1992.
I. Kraus : Úvod do strukturní rentgenografie, Academia, 1985. |
|
||
|
Last update: doc. RNDr. Miroslav Pospíšil, Ph.D. (09.10.2017)
Přednáška. |
|
||
|
Last update: doc. RNDr. Miroslav Pospíšil, Ph.D. (29.04.2020)
The exam consists of written preparation and an oral part. Written preparation precedes the oral part. The student receives three questions, each question is evaluated with a mark and the final mark is the average mark of the marks for each question. If one of the questions is not sufficiently answered, it means that the exam has not been passed. Failure to pass the exam means that three various questions will be asked again at the next deadline.
The requirements for the oral part of the exam correspond to the syllabus of the subject to the extent that was presented at the lecture.
It is probable that a significant part of exams or credits can take place in a distance form. It depends on the development of the current situation and you will be informed about any changes in time. |
|
||
|
Last update: prof. RNDr. Marek Procházka, Ph.D. (29.01.2019)
The relation of structure and properties (structure and biological activity) and the significance of this relation for prediction of properties in the development of new materials. Fundamentals of structural crystallography; Description of 3D periodic crystal structures: cell selection, grid types, point and space group symmetry operations; reciprocal lattice and its properties. Reciprocal lattice and diffraction pattern. Visualization of crystal structures and demonstration of effects of space group symmetry operation using Materials Studio. X-ray diffraction. radiation on crystal structures; Diffractive condition in direct and reciprocal space; Methods of application of diffraction conditions and basic types of diffraction experiments; Influence of symmetry of the structure and type of crystal lattice on the shape of diffractogram peaks, Friedel law, extinction conditions. Demonstration of the effect of symmetry of structures and grid type on the shape of diffractograms in powder and monocrystalline samples using Materials Studio. Diffraction of neutrons, electrons and synchrotron radiation, physical nature and consequent possibilities for use in structural analysis. Physical foundations and principles of electron microscopy, transmission electron microscopy, scanning electron microscopy, material analysis of the specimens by energy dispersion X-ray spectroscopy, sample preparation. Physical bases of X-ray diffraction: From diffraction on atoms to diffraction on 3D periodic structures, structure factor; Intensity of diffracted radiation; Electronic density and structure factor; Phase problem of structural analysis and methods of its solution, Patterson function, statistical methods in solving phase problem. Real crystal diffraction: Influence of temperature vibrations on diffraction image, diffraction on partially disordered structures; types of crystal defects and their effects on diffractograms; diffraction on amorphous substances - radial distribution functions and their interpretation. Preferred orientation of crystals - texture in natural and synthetic polymeric fibres. Determination of structures of macromolecular substances by small-scale scattering; Examples of structures of macromolecular substances: structures of polymers, proteins, structure of DNA, structures of viruses.
|