Sökning: "Jun Cheng"

Hittade 2 avhandlingar innehållade orden Jun Cheng.

1. 1. Signal processing approaches on otoacoustic emissions

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

   Sammanfattning : 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). LÄS MER

3. 2. Functional significance of phosphorylation of rat renal Na+, K+-ATPase by PKA and PKC

   Författare :Sam Xian Jun Cheng; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Na ; K -ATPase; protein phosphorylation; cAMP-dependent protein kinase; protein kinase C; site-directed mutagenesis; DNA transfection; isoproterenol; [Ca2 ]i.;

   Sammanfattning : The activity of Na+,K+-ATPase (NKA) is short term regulated by hormones as well as by signalling pathways that involve activation of PKA or PKC, but the mechanism(s) remains unclear. This study was performed to evaluate whether this regulation of NKA occurs via PKA- or PKC-mediated phosphorylation of the NKA a subunit. LÄS MER