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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Survival, growth and reproduction in Armeria maritima

Preston, M. January 1982 (has links)
No description available.
2

Inventering av kärlväxter i Vapnö grustäkt

Sjövall, Anna January 2017 (has links)
Höga kvävenedfall och förändringar inom jord- och skogsbruk har lett till igenväxning av svenska sandmarker. Sand- och grustäkter kan fungera som tillflyktsort för kärlväxtarter som är beroende av de torra och näringsfattiga markförhållanden som finns i sandmarker. Vapnö grustäkt i Hallands län undersöktes 2010 och visade sig ha en hög biologisk mångfald med bland annat 145 kärlväxtarter, varav fyra rödlistade. Syftet med den här studien var att se hur artsammansättningen av kärlväxter ser ut idag, sju år senare. Området inventerades vid tio tillfällen från april till augusti och samtliga kärlväxtarter noterades. Resultatet blev en lista på 224 arter varav 63 var återfynd från 2010 och 161 var nya arter för området. Det fanns fem rödlistade arter: Knippnejlika (Dianthus armeria) (EN), hårginst (Genista pilosa) (NT), backtimjan (Thymus serpyllum) (NT), skogsalm (Ulmus glabra) (CR) och naverlönn (Acer campestre) (CR). Det totala antalet arter och rödlistade arter har ökat sen 2010, vilket tyder på en positiv utveckling av områdets biologiska mångfald. Den höga artmångfalden beror troligen på det öppna, varierande landskapet och de rödlistade arterna växer där tack vare den alltmer ovanliga sandmarken. Områdets mångfald av kärlväxter hotas av igenväxning samt konkurrens från de invasiva arterna blomsterlupin (Lupinus polyphyllus) och parkslide (Fallopia japonica). Detta kan motverkas av störningar i form av slåtter, uppgrävning, naturvårdsbränning eller bete. / Nitrogen deposition and changes in agriculture and forestry have led to a decrease of sandy habitats in Sweden due to regrowth of vegetation. Sand- and gravelpits can act as refuges for vascular plants that require the dry and nutrient-poor conditions of sandy soils. Vapnö gravelpit in Halland county in Sweden was surveyed in 2010 and proved to hold a high biodiversity including 145 species of vascular plants, of which four were red-listed. Now, seven years later, the purpose of this study was to see how the composition of vascular plants has changed since then. The area was studied on ten occasions from April to August, and all species of vascular plants were noted. The study resulted in a list of 224 species, of which 63 were remaining since 2010 and 161 were new species for the area. There were five red-listed species: Dianthus armeria (EN), Genista pilosa (NT), Thymus serpyllum (NT), Ulmus glabra (CR) and Acer campestre (CR). The total number of species and red-listed species have increased, suggesting a positive development of the biodiversity of the area. The high species diversity is probably due to the open, varied landscape and the presence of the red-listed species due to the increasingly rare sandy habitat. The diversity of vascular plants in the area is threatened by regrowth of vegetation, as well as the invasive species Lupinus polyphyllus and Fallopia japonica. These threats can be counteracted by disturbance in the form of mowing or digging up plants, prescribed burning or grazing.
3

Etude de deux halophytes, Armeria maritima (Mill.) Willd. et Helichrysum stoechas (L.) Moench : exploration phytochimique, approche biotechnologique et valorisation dermo-cosmétique / Study of two halophytes, Armeria maritima (Mill.) Willd. et Helichrysum stoechas (L.) Moench : phytochemical exploration, biotechnological approach and dermocosmetic valorization.

Gourguillon, Lorène 03 July 2017 (has links)
L'étude phytochimique d'Armeria maritima et d'Helichrysum stoechas a permis d'isoler pour la première fois 31 molécules dans le genre Armeria dont 4 nouveaux flavonols diglycosylés, ainsi que le développement d'une stratégie de déréplication pour l'étude d'H. stoechas. Dans les deux espèces, nous avons relevé une richesse en polyphénols, qui pourraient être extraits par des techniques respectueuses de l'environnement comme la SFE. En parallèle, ces deux halophytes ont montré un fort potentiel biologique avec des extraits et des molécules dotés d'activités anti-oxydante, anti-collagénase, anti-inflammatoire ou encore cicatrisante. De plus, nous avons initié pour la première fois des suspensions cellulaires d'A. maritima et identifié des éliciteurs comme le méthyl jasmonate permettant d’augmenter dans les cellules d'H. stoechas la teneur en acide 3,5-dicaféoylquinique, un bio-marqueur de l'activité anti-inflammatoire. La production de molécules bioactives dans des cultures végétales in vitro pourrait par la suite être transposée à plus grande échelle, afin d’amplifier le potentiel de valorisation de ces deux halophytes en dermo-cosmétique. / The phytochemical study of Armeria maritima and Helichrysum stoechas led to the isolation of 31 molecules never reported before in the genus Armeria, 4 of which being new flavonol diglycosides, and to the development of a dereplication strategy for the study of H. stoechas. In both species, an abundance of polyphenols was observed, which could be extracted with eco-friendly methods like SFE. Both halophytes showed a strong biological potential as their extracts and molecules demonstrated antioxidant, anti-collagenase, anti-inflammatory and wound healing activities. Moreover, we initiated for the first time cell suspensions of A. maritima, and identified elicitors, such as methyl-jasmonate, which led to H. stoechas cell suspensions with an increased content in 3,5-dicaffeoylquinic acid, a bio-marker of anti-inflammatory activity. The production of bioactive molecules in "plant cell factories" could be scaled-up to enhance the valorization potential of both halophytes in dermocosmetics.

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