Search for dissertations about: "spontaneous activity"

Showing result 1 - 5 of 178 swedish dissertations containing the words spontaneous activity.

  2. 1. Creating Optical Activity: Total Spontaneous Resolution and Viedma Ripening

    Author : Per Martin Björemark; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Optical activity; absolute asymmetric synthesis; total spontaneous resolution; Viedma ripening; grinding; chirality; conglomerate; coordination compound; coordination polymer; single crystal X-ray diffraction; solvent free oxidation; nantioselective sulfide oxidation; solid state VCD;

    Abstract : The creation of optical activity has been considered as something impossible even though reports of such creation via total spontaneous resolution since the 1940´s have been published. More recently Viedma ripening have been developed that also produce enantiopure bulk product. Both methods are examples of absolute asymmetric synthesis i.e. READ MORE

  4. 2. Breaking the symmetry: creation and transfer of optical activity via total spontaneous resolution and stereoselective reactions

    Author : Susanne Olsson; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; absolute asymmetric synthesis; enantioselective reactions; chirality; spontaneous resolution; conglomerate; organometallic chemistry; coordination compounds; attritionenhanced deracemisation; polymorphism; organolithium compounds; single-crystal X-ray crystallography;

    Abstract : The generation of optical activity from achiral or racemic precursors – absolute asymmetric synthesis – is discussed in relation to the origin of biomolecular homochirality but is also often (incorrectly) regarded as being impossible. One approach to absolute asymmetric synthesis is the use of compounds that form chiral crystals. READ MORE

  5. 3. Mind in Motion: The utilization of noise in the cognitive process

    Author : Robert Pallbo; Data Vetenskap; []
    Keywords : HUMANIORA; HUMANITIES; AI; image processing; spontaneous activity; motion detection; knowledge acquisition; homunculus; evolutionary epistemology; evolution; cognition; noise; neural networks; Psychology; Psykologi;

    Abstract : The brain is not silent. Even in the absence of stimuli are the neurons activated every now and then in what is called "spontaneous" or "background activity" which provides a noisy background to the operation of the brain. This work shows how this noise can be utilized in the cognitive process. READ MORE

  6. 4. Cursed complexity. Computational properties of subcortical neuronal microcircuitry in sensorimotor control

    Author : Anton Spanne; Hjärnans sensorimotoriska funktioner; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; spike firing statistics; spontaneous activity; sensorimotor control; tactile processing; cuneate nucleus; sparse coding; spinal border cells; cerebellum;

    Abstract : One of the big obstacles for understanding the nervous system is its inherent complexity. It poses problems when interpreting both experimental and theoretical studies since we are currently forced to consider only reduced variants of the actual circuitry of the brain. READ MORE

  7. 5. Enriched, task specific therapy in the chronic phase after stroke

    Author : Sara Vive; Göteborgs universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; stroke; enriched environment; rehabilitation; intense training; qualitative research; gait analysis; gait speed; function; activity; participation; health;

    Abstract : Recovery and improvement of motor functions and abilities after stroke depend on the spontaneous recovery process but also on the reorganization of neural mechanisms. In animal studies, an Enriched Environment (EE) has proved to be an effective intervention for boosting brain plasticity and recovery after stroke. READ MORE