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- Enckell, P H, et al.
(författare)
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Serf and waif colonization: different patterns in distribution and dispersal of invertebrate species in settlements in the Faroe Islands
- 1987
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Ingår i: Journal of Biogeography. - 0305-0270 .- 1365-2699. ; 14, s. 89-104
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Tidskriftsartikel (refereegranskat)abstract
- We measured the faunal similarityb etween samples of Coleoptera, Araneae and Gastropoda + Lumbricidae + Opiliones from infields ites in the Faroes by ordination,a nd compared the sites on a between-islandb asis. The aeriallyd ispersingA raneae did not show any island-specific pat-tern; the faunal similarityw as high between the islands. Coleoptera showed a patternw heres imilarityw ithini slandsw as highert hanb etween them.T he anthropochorous parto ft he Coleopteraf ormeda clear pattern reminiscentof t heg eographicala ppearanceo ft heF aroes; similarity within large islandsw as clearlyh ighert han betweeni slands. This indicatest hat one of the axes in thep rincipalc omponenta nalysisi s an approximationo f some measure of geographical distance. The small islands, however, showed the randomp atterno f a waifc olonizationa nd occurreds cattered in the factors pace. The anthropochorous groupsG astropoda + Lumbricidae+ Opiliones differedm arkedlyf roms uch a pattern,a nd were more similart o the aerially dispersingA raneae. We interprett his as being the result of a dispersalb etweena nd withinis landsd ependento n Man, and a persistence (of manys pecies) in man-madeh abitatso nly. We termt hiss erfc oloniza-tion to indicate those species' total dependence upon Man.
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- Enckell, P H, et al.
(författare)
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The dispersal pattern of an anthropochorous species: Genetic variation in populations of Lumbricus terrestris L. (Lumbricidae) in the Faroe Islands
- 1986
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Ingår i: Hereditas. - : Springer Science and Business Media LLC. - 0018-0661 .- 1601-5223. ; 104:2, s. 253-261
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Tidskriftsartikel (refereegranskat)abstract
- Ten populations of the anthropochorous Lumbricus terrestris L. (Lumbricidae) from six islands in the Faroes were scored for enzyme variation by electrophoresis. The allele frequencies were analyzed by cluster analysis and information entropy relationships. There was a significant heterogeneity in allele frequencies among the samples. Four groups could be distinguished in the cluster analysis of which one was larger (at least five sites); two sites were defined as outliers. Information entropy showed that the allele frequency data were structured differently over the sites and that the most non-random site was also one of the outliers in the cluster space. The main group in the cluster analysis also forms a geographically central group in the islands. These results are discussed against the known colonization history of the Faroes. It is concluded that the genetic variation pattern does not indicate any single point of invasion of L. terrestris into the islands. Rather, it shows that former and present-day communications between the islands are responsible for similarities and dissimilarities in genetic variation in the L. terrestris populations.
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- Siesjö, Bo, et al.
(författare)
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Arachidonic acid metabolism in seizures
- 1989
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Ingår i: Annals of the New York Academy of Sciences. - : Wiley. - 0077-8923 .- 1749-6632. ; 559, s. 323-339
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Tidskriftsartikel (refereegranskat)
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- Siesjö, Bo, et al.
(författare)
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Free radicals and brain damage
- 1989
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Ingår i: Cerebrovascular and Brain Metabolism Reviews. - 1040-8827. ; 1:3, s. 165-211
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Tidskriftsartikel (refereegranskat)abstract
- Although free radicals have been suggested to contribute to ischemic brain damage for more than 10 years, it is not until quite recently that convincing evidence has been presented for their involvement in both sustained and transient ischemia. The hypothesis is examined against current knowledge of free radical chemistry, as it applies to biological systems, and of cellular iron metabolism. It is emphasized that those advents have changed our outlook on free radical-induced tissue damage. First, it has been realized that damage to DNA and proteins may be an earlier event than lipid peroxidation, perhaps also a more important one. Second, evidence now exists that the triggering event in free radical-induced damage is a disturbance of cellular iron metabolism, notably delocalization of protein-bound iron, and its chelation by compounds that trigger site-specific free radical damage. Third, methods have been developed that allow the demonstration of partially induced oxygen species in tissues, and scavengers have become available that can curb free radical reactions. As a result of these events, it has been possible to demonstrate formation of free radicals in oxygen toxicity, trauma, and ischemia, and their participation in the cell damage that is incurred in these conditions, particularly in causing vascular pathology and edema. It is suggested that in ischemia, free radical damage becomes pathogenetically important when the ischemia is of long duration, when conditions favor continued delivery of some oxygen to the ischemic tissue, and particularly when such partially oxygen-deprived tissue is reoxygenated.
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