Search for dissertations about: "Teknisk-naturvetenskapliga fakulteten"

Showing result 1 - 5 of 18 swedish dissertations containing the words Teknisk-naturvetenskapliga fakulteten.

  2. 1. Analysis of plant growth regulating substances

    Author : Barbro Andersson; Bo Jansson; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Plant regulators; phytohormones; pine; spruce; anther; abscisic acid; 3-indoleacetic acid; gibberellin Ag; N- 3-indoleacetyl -aspartic acid; dichlorophene; Amberlite XAD-7; identification; quantification; GC; HPLC; GC-MS; GC-MID; Hormoner;

    Abstract : Natural plant growth regulators (phytohormones) are a group of organic compounds which, in very small amounts, act as regulators of physiological processes in plants.Methods were developed for the analysis of phytohormones in samples from Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris (L. READ MORE

  4. 2. On the Application of Short-term Causal Models

    Author : Anders Baudin; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Causal (econometric) models are often employed as instruments for for-casting in short-term planning within organizations. The aim of this work is to contribute to an understanding of the short-term aspects of causal model building. READ MORE

  5. 3. Crystal structure studies of a new series of molybdovanadate polyanions and some related vanadates

    Author : Arne Björnberg; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; isopolyvanadates; molybdovanadate polyanions; single-crystal X-ray investigations; ESR spectroscopy; heteropoly blues;

    Abstract : The determination of complexes formed in weakly acidic aqueous solutions containing pentavalent vanadium as well as hexavalent molybdenum has proved diffi cui t due to slow equilibria and 1 imi ted sol ubi 1 i ty of especially the vanadium species. The formation of several different polynuclear complexes with a very varied molybdenum/vanadium ratio also complicates the interpretation of Potentiometrie data. READ MORE

  6. 4. An investigation of the radiation chemistry of a hydrocarbon system and simulation of ESR spectra of triplet state molecules

    Author : Ola Claesson; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Radiation chemistry; isotope effects; energy transfer; selective straction; spectrum simulation;

    Abstract : This thesis can be divided into two parts.The aim of the studies described in the first part of the thesis isto make clear the dominating processes in the selective decorrpositionof certain solutes that follow low-terrperature radiolysis of crystalline hydrocarbons.1. READ MORE

  7. 5. The influence of voles and lemmings on the vegetation in a coniferous forest during a 4-year period in northern Sweden

    Author : Lars Ericson; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : .... READ MORE