No (624)
Yes (3)
Number of found documents:
627
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Electric field generated by higher vibration modes of microtubule
Cifra, Michal; Havelka, D.; Kučera, Ondřej; Pokorný, Jiří
2010 - English
Certain structures in a living cell may generate electric oscillations. Microtubules, which form a part of a cellular skeleton, belong to this class of structures and ful-fill all conditions for generation of electric oscillations in kHz÷GHz band. We present selected results from calculations of the oscillatory electric field generated by higher vibration modes of microtubules. We propose that the electric field of certain modes may play specific function in cellular organization
Keywords:
Bioelectromagnetism; Microtubules; Polar vibration modes
Available at various institutes of the ASCR
Electric field generated by higher vibration modes of microtubule
Certain structures in a living cell may generate electric oscillations. Microtubules, which form a part of a cellular skeleton, belong to this class of structures and ful-fill all conditions for ...
Complex Cepstrum in Speech Synthesi
Vondra, Martin; Vích, Robert
2010 - English
In the contribution the use of the complex cepstrum in speech modeling and synthesis is shortly described. The obtained mixed phase parametric speech model is of the finite impulse response type and contains also information about the phase properties of the modeled speech frame. The synthesized speech is more natural, but the memory requirements and numerical complexity are much higher than for minimum phase realization.
Keywords:
speech analysis; speech synthesis
Available in a digital repository NRGL
Complex Cepstrum in Speech Synthesi
In the contribution the use of the complex cepstrum in speech modeling and synthesis is shortly described. The obtained mixed phase parametric speech model is of the finite impulse response type and ...
Measurement and Computer Simulation of Electromagnetic Oscillations of Living Cells
Cifra, Michal; Pokorný, Jiří; Vrba, J.
2009 - English
Frohlich postulated coherent polar oscillations as a fundamental biophysical property of biological systems. Recently, Pelling et al. (2004, 2005) detected mechanical vibrations of yeast cell membrane with atomic force microscope (AFM) and analyzed by Fourier analysis in the frequency range 0.5-2 kHz with amplitudes of the order of 1 nm. This article describes the measurement of electric activity of yeast cells in the acoustic frequency range and of mechanical vibrations of cell membrane. Spectrum analyzer and electrically and > electromagnetically screened box with point sensor and amplifiers fed by batteries were used for measurement of synchronized and non synchronized tubulin mutants of yeast cells. We show that the electric activity of synchronized cells in the M phase is greater that of non synchronized cells. That corresponds to the findings of Pohl et al. (1981). Obtained results of measurement of cell electric activity are in good agreement with AFM findings.
Keywords:
bioelectric phenomena; cellular biophysics; modeling
Available at various institutes of the ASCR
Measurement and Computer Simulation of Electromagnetic Oscillations of Living Cells
Frohlich postulated coherent polar oscillations as a fundamental biophysical property of biological systems. Recently, Pelling et al. (2004, 2005) detected mechanical vibrations of yeast cell membrane ...
Control system of the laser topographer
Kostka, František; Žďánský, Karel; Zavadil, Jiří; Starý, Robert
2009 - English
Universal apparatus for measuring photoluminescence over surface of semiconductor samples was designed and realized.
Keywords:
control systems; Laser optic; photolominescence
Available at various institutes of the ASCR
Control system of the laser topographer
Universal apparatus for measuring photoluminescence over surface of semiconductor samples was designed and realized.
Surface plasmon resonance biosensors: Today and Tomorrow
Homola, Jiří
2009 - Czech
Tento článek diskutuje současný stav ve výzkumu a vývoji optických biosenzorů s povrchovými plazmony a představuje vybrané výsledky výzkumu v této oblasti v Ústavu fotoniky a elektroniky AV ČR, v.v.i., Praha. This paper reviews the present state of the art and recent advances in the development of SPR sensors and presents selected results of SPR sensor research at the Institute of Photonics and Electronics, Prague.
Keywords:
Surface plasmon resonance imaging; Biosensor; Protein detection
Available at various institutes of the ASCR
Surface plasmon resonance biosensors: Today and Tomorrow
Tento článek diskutuje současný stav ve výzkumu a vývoji optických biosenzorů s povrchovými plazmony a představuje vybrané výsledky výzkumu v této oblasti v Ústavu fotoniky a elektroniky AV ČR, ...
Czech Acted Emotional Speech Database
Vondra, Martin; Vích, Robert; Horák, Petr
2009 - English
This paper describes the design, recording and evaluation of a Czech acted emotional speech database. The database contains 16 usual everyday sentences read by five professional speakers in six basic emotional styles and the neutral style.
Keywords:
Speech; Emotion; Listening test
Available at various institutes of the ASCR
Czech Acted Emotional Speech Database
This paper describes the design, recording and evaluation of a Czech acted emotional speech database. The database contains 16 usual everyday sentences read by five professional speakers in six basic ...
Metody plně optické konverze vlnových délek a modulačních formátů pro optické sítě s vysokou přenosovou rychlostí
Honzátko, Pavel
2009 - Czech
Byly představeny výsledky skupiny v oblasti plně optických konverzních metod, zejména vlnový konvertor založený na křížové fázové modulaci v nelineárním vlákně s konverzí na amplitudovou modulaci ve vláknové Braggově mřížce, vlnový konvertor s křížovou modulací v polovodičovém optickém zesilovači s konverzí na amplitudovou modulaci v mřížce s dlouhou periodou a konvertor modulačního formátu RZ/NRZ s křížovou fázovou modulací v Sagnacově interferometru. A survey of results in the field of all-optical conversion methods, namely a wavelength converter based on the fiber XPM with subsequent conversion of PM into AM in FBG, a wavelength converter with XPM/XGM in SOA with conversion to AM in LPG, and a modulation format converter RZ/NRZ based on fiber XPM in Sagnac interferometer.
Keywords:
communications; sensing
Available at various institutes of the ASCR
Metody plně optické konverze vlnových délek a modulačních formátů pro optické sítě s vysokou přenosovou rychlostí
Byly představeny výsledky skupiny v oblasti plně optických konverzních metod, zejména vlnový konvertor založený na křížové fázové modulaci v nelineárním vlákně s konverzí na amplitudovou modulaci ve ...
Calculation of the Electromagnetic Field Around Microtubule
Havelka, D.; Cifra, Michal
2009 - English
Microtubules are important structures in cytoskeleton which organizes the cell. Single microtubule is composed of electrically polar structures, tubulin heterodimers, which have strong electric dipole moment. Vibrations are expected to be generated in microtubules, thus tubulin heterodimers as electric dipoles are oscillating. This gives rise to electromagnetic field, which is detected around the cells. We calculate here the electromagnetic field of microtubules if they are excited at 1 GHz. This paper includes the work done in bachelor thesis of the first author.
Keywords:
bioelectric phenomena; microtubules; bioelectromagnetism
Available at various institutes of the ASCR
Calculation of the Electromagnetic Field Around Microtubule
Microtubules are important structures in cytoskeleton which organizes the cell. Single microtubule is composed of electrically polar structures, tubulin heterodimers, which have strong electric dipole ...
Respiratory and cardiovascular health effects of nanoparticles
Nohavica, Dušan
2009 - English
Numerous combustion related and natural sources generate airborne ultra fine particulate matter (<100 nm). Several epidemiological studies have found adverse respiratory and cardiovascular health effects in susceptible parts of the population to be associated with these particles. Published clinical studies with 10-50 μg/m3 ultra fine elemental carbon particles as surrogates for ambient particles did induce cardiovascular effects in healthy adults.
Keywords:
Nanotechnology; toxicity
Available at various institutes of the ASCR
Respiratory and cardiovascular health effects of nanoparticles
Numerous combustion related and natural sources generate airborne ultra fine particulate matter (...
Microscopy of nanoparticles and films with nanoparticles
Kacerovský, Pavel; Žďánský, Karel; Procházková, Olga; Vaniš, Jan; Grym, Jan; Vasiliev, A.; Pašajev, E. M.
2009 - English
To study the electrophoreticaly deposited nanolayers of reverse micelles with Pd nano-particles on n-type InP substrates a wide range of current microscopic methods has been used. What concerns analytical methods the X-ray diffraction and mass spectrometry SIMS were used. The most relevant results about Pd nanoparticles in the layer were obtained by using HRTEM microscopy and SIMS spectrometry. In nanolayers crystallographic arrangement of Pd nanoparticles has not been found.
Keywords:
semiconductor devices; nanostructures
Available at various institutes of the ASCR
Microscopy of nanoparticles and films with nanoparticles
To study the electrophoreticaly deposited nanolayers of reverse micelles with Pd nano-particles on n-type InP substrates a wide range of current microscopic methods has been used. What concerns ...
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