Sökning: "Christer Nilsson"

Visar resultat 16 - 20 av 38 avhandlingar innehållade orden Christer Nilsson.

1. 16. Use of phytometers for evaluating ecological restoration

   Författare :Anna L. Dietrich; Christer Nilsson; Martin Wassen; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bioassay; Channelization; Ecosystem change; Ecosystem response; ekologisk botanik; Ecological Botany;

   Sammanfattning : The increase in ecological restoration can be attributed to valuation of healthyecosystems and concerns for future climate changes. Freshwaters belong among theglobally most altered ecosystems and are restored to counteract human impacts. LÄS MER

3. 17. Ice, wood and rocks : regulating elements in riverine ecosystems

   Författare :Johanna Engström; Christer Nilsson; Roland Jansson; James Helfield; Tenna Riis; Umeå universitet; []
   Nyckelord :riparian zone; timber floating; river restoration; cut-off side channels; hydrochory; large wood; anchor ice; fish;

   Sammanfattning : Riparian ecosystems are of great importance in the landscape, connecting landscape elements longitudinally and laterally and often encompassing sharp environmental gradients in ecological processes and communities. They are influenced by fluvial disturbances such as flooding, erosion and sediment deposition, which create dynamic and spatially heterogeneous habitats that support a high diversity of species. LÄS MER

4. 18. Neural Stem Cell Differentiation and Migration

   Författare :Anna Erlandsson; Karin Forsberg-Nilsson; Bengt Westermark; Christer Betsholtz; Uppsala universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Medicine; CNS; stem cells; neuron; PDGF; SCF; differentiation; migration; ERK; Medicin; Dermatology and venerology; clinical genetics; internal medicine; Dermatologi och venerologi; klinisk genetik; invärtesmedicin; Medicinsk biokemi; Medical Biochemistry;

   Sammanfattning : Neural stem cells are the precursors of neurons, astrocytes and oligodendrocytes. During neural development, the division of stem cells takes place close to the lumen of the neural tube, after which they migrate to their final positions within the central nervous system (CNS). LÄS MER

5. 19. Perspektiv på Patron : Bruksägaren och statsministern Christian Lundeberg (1842–1911)

   Författare :Bo G Hall; Torkel Jansson; Christer Ericsson; Torbjörn Nilsson; Uppsala universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Sweden 1870-1911; biography as scientific method; iron and steel industry; paternalistic concepts; Sweden-Norway union relations; homosocial factors; defense matters; universal suffrage; History subjects; Historieämnen; Historia; History;

   Sammanfattning : The dissertation is a biography of the industrialist and statesman Christian Lundeberg, a leading and stongly pronounced conservative actor in Swedish political life during the decades around1900, but nowadays almost forgotten. The purpose is to identify the main forces – convictions as well as external factors – behind his actions. LÄS MER

7. 20. Gradients of time and complexity : understanding how riparian and instream ecosystems recover after stream restoration

   Författare :Eliza Maher Hasselquist; Christer Nilsson; Stewart Rood; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bioassessment; biodiversity; boreal; bryophyte; chronosequence; complexity; diatom; geomorphology; habitat heterogeneity; hydromorphological; macroinvertebrate; macrophyte; nitrogen cycling; river restoration; riparian buffer; stable isotopes; succession; Sweden; Environmental Science; miljövetenskap;

   Sammanfattning : Why evaluations of the ecological outcomes of stream and river restoration have largely reported inconclusive or negative results has been the subject of much debate over the last decade or more. Understanding the reasons behind the lack of positive results is important for bettering future restoration efforts and setting realistic expectations for restoration outcomes. LÄS MER