Search for dissertations about: "Oscillations"

Showing result 1 - 5 of 443 swedish dissertations containing the word Oscillations.

  1. 1. Glycolytic oscillations in individual yeast cells

    Author : Anna-Karin Gustavsson; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Keywords : Optical manipulation; Microfluidics; Fluorescence microscopy; Single cell analysis; Saccharomyces cerevisiae; Glycolysis; Oscillations; NADH; Heterogeneity; Synchronization; Robustness; Universality;

    Abstract : Oscillations in the concentration of yeast glycolytic intermediates have been intensively studied since the 1950s, but these studies have so far been limited to observations of average oscillatory behavior in synchronized cultures. Hence, it has remained unknown whether the onset of oscillations is a collective property of the population which requires a high cell density, or if individual cells can oscillate also in isolation. READ MORE

  2. 2. Tunable superconducting resonators, subharmonic oscillations and manipulation of microwaves

    Author : Ida-Maria Svensson; Chalmers University of Technology; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; circuit-QED; tunable superconducting resonators; subharmonic oscillations; parametric oscillations; microwave manipulation; frequency down-conversion; driven nonlinear systems; superconducting resonator; SQUID; tunable resonator;

    Abstract : In this thesis I present different types of manipulations of microwave fields using tunable superconducting resonators. A resonator is made tunable by adding one or more superconducting quantum interference devices, SQUIDs. The SQUID consists of a superconducting loop with two Josephson junctions and acts as a tunable nonlinear inductor. READ MORE

  3. 3. Single Cell Studies of Glycolytic Oscillations Using Microfluidics and Optical Tweezers

    Author : Anna-Karin Gustavsson; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Keywords : NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES; Optical manipulation; microfluidics; fluorescence microscopy; single cell imaging; Saccharomyces cerevisiae; glycolysis; oscillations; NADH;

    Abstract : The complex set of reactions in metabolism has been extensively studied in populations with millions of cells, but much information can still be gained by studying the heterogeneous metabolic behaviour in individual cells. The first part of energy metabolism is called glycolysis and is very similar in mammalian cells, such as human cells, and in yeast cells. READ MORE

  4. 4. On the Generation of cAMP Oscillations and Regulation of the Ca2+ Store-operated Pathway in Pancreatic Islet α- and β-cells

    Author : Geng Tian; Erik Gylfe; Anders Tengholm; Patrick Gilon; Uppsala universitet; []
    Keywords : MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; cAMP; oscillations; adrenaline; GLP-1; phosphodiesterase; palmitate; STIM1; Orai1; store-operated calcium entry; insulin secretion; glucagon secretion; β-cell; α-cell; Medical Cell Biology; Medicinsk cellbiologi;

    Abstract : Insulin and glucagon are released in pulses from pancreatic β- and α-cells, respectively. Both cell types are electrically excitable, and elevation of the cytoplasmic Ca2+ concentration ([Ca2+]i) due to depolarization with voltage-dependent entry of the cation is the main trigger of hormone secretion. READ MORE

  5. 5. On the Mechanisms Behind Hippocampal Theta Oscillations : The role of OLMα2 interneurons

    Author : Sanja Mikulovic; Richardson Leao; Klas Kullander; Stefan Remy; []
    Keywords : MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; hippocampus; interneuron; optogenetics; theta oscillations; anxiety;

    Abstract : Theta activity is one of the most prominent rhythms in the brain and appears to be conserved among mammals.  These 4-12 Hz oscillations have been predominantly studied in the dorsal hippocampus where they are correlated with a broad range of voluntary and exploratory behaviors. READ MORE