Avancerad sökning
Visar resultat 1 - 5 av 28 avhandlingar som matchar ovanstående sökkriterier.
1. Studies of acoustic waves, noise and charge pumping using single-electron devices
Sammanfattning : This thesis covers a range of experiments on single-electron devices, electrical circuits that utilize the discreetness of the electron charge. The Single-Electron Transistor (SET) is of special importance among these, being the most sensitive electrometer demonstrated, and sufficiently mature to serve as a building block in sensors and detectors for physical phenomena that can be transformed into charge signals. LÄS MER
2. Experimental studies of proton translocation reactions in biological systems : Electrogenic events in heme-copper oxidases
Sammanfattning : Terminal heme-copper oxidases (HCuOs) are transmembrane proteins that catalyze the final step in the respiratory chain - the reduction of O2 to H2O, coupled to energy conservation by generation of an electrochemical proton gradient. The most extensively investigated of the HCuOs are the aa3-type oxidases, to which cytochrome c oxidase (CytcO) belongs, which uses energy released in the O2-reduction for proton pumping. LÄS MER
3. Choreography of a proton pump : Studies of charge-transfer reactions in cytochrome c oxidase
Sammanfattning : In the last step of cellular respiration, electrons from metabolites are transferred to molecular oxygen, mediated by the enzyme complexes of the respiratory chain. Some of these enzyme complexes couple these redox reactions to formation of an electrochemical proton gradient across the cell membrane. The proton gradient is used e.g. LÄS MER
4. Molecular machinery of a membrane-bound proton pump : Studies of charge transfer reactions in cytochrome c oxidase
Sammanfattning : In cellular respiration, electron transfer from the breakdown of foodstuff is coupled to the formation of an electrochemical proton gradient. This is accomplished through proton translocation by respiratory complexes, and the proton gradient is subsequently used e.g. to drive ATP production. LÄS MER
5. Ultra-low Power Design Approaches in Memories and Assist Techniques
Sammanfattning : The need for more functionality and higher performance has increased the number of transistors to billions in current processors. A high number of transistors on the same chip area increases the power density, which in turn heats up the devices and lowers the life time of batteries. LÄS MER
