Search results for "psbA"
showing 5 items of 25 documents
A Help Desk tool for sporadically occurring inquiries. Based on Microsoft Outlook 2000 and Computas GTA.
1999
Masteroppgave i informasjons- og kommunikasjonsteknologi 1999 - Høgskolen i Agder, Grimstad A help desk is intended to support inquiries from users of one or several systems. The help desk could act as an external service point to customers, just as well as an employee-based service. Because of the movement towards more complex computer environments, support departments need to be more flexible and more proactive in handling service requests. The primary goals of a support department are to increase the quality of service and to lower the cost needed to provide it. The combination of more complex systems to support and the continual demand of lowering the Total Cost of Ownership (TCO), supp…
Convergent Morphological Evolution in Silene Sect. Italicae (Caryophyllaceae) in the Mediterranean Basin
2022
Recent divergence can obscure species boundaries among closely related taxa. Silene section Italicae (Caryophyllaceae) has been taxonomically controversial, with about 30 species described. We investigate species delimitation within this section using 500 specimens sequenced for one nuclear and two plastid markers. Despite the use of a small number of genes, the large number of sequenced samples allowed confident delimitation of 50% of the species. The delimitation of other species (e.g., Silene nemoralis, S. nodulosa and S. andryalifolia) was more challenging. We confirmed that seven of the ten chasmophyte species in the section are not related to each other but are, instead, genetically c…
Taxonomy and evolution of the Convolvulus sabatius complex (Convolvulaceae)
2010
A revision of the Convolvulus sabatius complex is presented and five taxa are now recognised. Convolvulus valentinus is re-circumscribed to comprise only blue-flowered individuals. Yellow-flowered plants previously referred to this species are transferred to C. supinus where they are recognised as a distinct variety: C. supinus var. melliflorus, comb nov. Variation in intensity of flower colour, pubescence and leaf shape among blue-flowered C. valentinus is highly variable within populations and in contrast to earlier treatments, no infraspecific taxa based on these traits are recognised. Despite suggestions to the contrary, the delimitation of the cultivated ornamental C. sabatius and its …
Major loss of coralline algal diversity in response to ocean acidification
2021
[Abstract] Calcified coralline algae are ecologically important in rocky habitats in the marine photic zone worldwide and there is growing concern that ocean acidification will severely impact them. Laboratory studies of these algae in simulated ocean acidification conditions have revealed wide variability in growth, photosynthesis and calcification responses, making it difficult to assess their future biodiversity, abundance and contribution to ecosystem function. Here, we apply molecular systematic tools to assess the impact of natural gradients in seawater carbonate chemistry on the biodiversity of coralline algae in the Mediterranean and the NW Pacific, link this to their evolutionary h…
Ocena przydatności loci barkodowych do identyfikacji gatunków roślin łąk i muraw kserotermicznych. Komunikat
2020
Analiza sekwencji kilku loci nosząca nazwę barkodingu, została wykorzystana do identyfikacji gatunków roślin występujących w środkowoeuropejskich zbiorowisk traworoślowych. W toku analizy przebadano użyteczność 14 regionów chloroplastowych i jednego jądrowego do identyfikacji gatunków. Osiem spośród nich (matK, rbcL, rpoC1, trnH-psbA, atpF-atpH, trnL, psbI-psbK i ITS) wykorzystano do stworzenia kombinacji barkodów, które umożliwiają określenie tożsamości próbki tkanki roślinnej o pochodzeniu łąkowym, bez konieczności porównania z kluczem do oznaczania roślin.