Search for dissertations about: "outer hair cell"

Showing result 6 - 10 of 20 swedish dissertations containing the words outer hair cell.

2. 6. Dynamics of Photoinduced Processes in Dye-Sensitized Nanocrystalline Semiconductor Films--Reactions in the Photoactive Part of the Grätzel Solar Cell

   Author : Gabor Benko; Kemisk fysik; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; supraledare; magnetisk resonans; spektroskopi; magnetiska och optiska ; egenskaper elektriska; Kondenserade materiens egenskaper:elektronstruktur; spectroscopy; relaxation; magnetic resonance; supraconductors; Kemi; Condensed matter:electronic structure; electrical; femtosecond spectroscopy; solar cells; Chemistry; excited states; photoinduced electron transfer; transition metal complexes; nanocrystalline titanium dioxide; dye sensitization; porous semiconductor film; magnetic and optical properties;

   Abstract : The key materials used to convert solar energy into electricity in the Grätzel-type solar cells are dye molecules and titanium dioxide particles attached to each other. The former are similar to those in common products like purple pigments in blueberry juice, while the latter are like sunscreen, white paint, or toothpaste. READ MORE

4. 7. K+ channels in the inner ear : electrophysiological and molecular studies

   Author : Guihua Liang; Karolinska Institutet; Karolinska Institutet; []
   Keywords : Cochlea; gene expression; hair cell; immunohistochemistry; KCNQ; lead; M current; mercury; patch clamp; RT-PCR; voltage-gated potassium channels;

   Abstract : Potassium channels are involved in several fundamental cellular processes. Heavy metals, such as mercury and lead, are widespread toxic pollutants and have been shown to act on various ion channels in the central nervous system. READ MORE

5. 8. Signal processing approaches on otoacoustic emissions

   Author : Jun Cheng; Karolinska Institutet; Karolinska Institutet; []
   Keywords : otoacoustic emissions; signal processing; time-frequency representation; cochlea; outer hair cell; neonatal hearing screening; basilar membrane nonlinearity; bounce phenomenon; spectral estimation; interrelations of OAEs;

   Abstract : The recent achievement on the measurement of otoacoustic emissions (OAEs) is based on a novel technical development of digital signal processing. OAEs measured in the external ear canal are normal by-products of the active process in hearing, which was discovered by Kemp (1978). READ MORE

6. 9. Atomic force microscopic studies of inner ear structure and mechanics

   Author : Alexandra Zelenskaya; Karolinska Institutet; Karolinska Institutet; []
   Keywords : Atomic force microscopy; indentation curves; mechanical properties; outer hair cells; shell-core model; electromotility; prestin; otoconia; tympanic membrane.;

   Abstract : The transduction processes occurring in the inner ear, from sound induced vibration or head movements to nerve impulses sent to the brain, are to a large part dependent on the mechanical properties of the different components of this organ, especially the sensory hair cells. The function of the hearing organ is for example dependent on the unique mechanoelectric transduction properties of the cochlear outer hair cells (OHCs), which are able to respond to electrophysiological and mechanical stimulations by changing their shape and their mechanical properties. READ MORE

7. 10. Physiological aspects of cochlear excitation and neurotransmitter release

   Author : Wanje Jäger; Karolinska Institutet; Karolinska Institutet; []
   Keywords : Cochlea; cochlear microphonics; summating potential; vibratory response; tetracaine; aspartate; glutarnate; neurotransmitter; noise; hearing loss;

   Abstract : Using an in vitro model of the guinea pig, the temporal bone preparation, cochlear physiology was studied. By perfusion of the scala tympani with oxygenated culture medium, the responses of the hearing organ to sound stimuli were maintained over several hours and the functional state was followed by monitoring the electrophysiological parameters cochlear microphonics (CM) and summating potential (SP). READ MORE