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- Bengtsson, Anders K.H., et al.
(författare)
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Particles, superparticles and twistors
- 1987
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Ingår i: Phys. Rev. D36 (1987) 1766.
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Tidskriftsartikel (refereegranskat)abstract
- The covariant Green-Schwarz action for a superstring has never been quantized covariantly. The physics behind this is discussed. We then consider the corresponding point-particle action in four dimensions, and write down a master action from which it can be obtained as a gauge choice: the ‘‘space-time gauge.’’ There is also a ‘‘twistor gauge,’’ in which covariant quantization is straightforward (as noted previously by Shirafuji).
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| 3. |
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| 4. |
- 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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| 5. |
- 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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| 6. |
- Paulsen, Otto, et al.
(författare)
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The interaction of erythromycin with theophylline
- 1987
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Ingår i: European Journal of Clinical Pharmacology. - 0031-6970. ; 32:5, s. 8-493
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Tidskriftsartikel (refereegranskat)abstract
- We have studied the interaction of erythromycin with theophylline. We gave ten healthy volunteers theophylline as an intravenous loading dose (5 mg X kg-1) over 1 h, followed by a maintenance infusion (0.5 mg X kg-1 X h-1) for 5 h. A second infusion of theophylline was given after 9 days of treatment with 1 g erythromycin base daily, and the concentrations of theophylline were determined during the infusion periods. The concentrations of erythromycin were measured for 8 h, after one week of treatment, and also after the last erythromycin dose, simultaneously with the second theophylline infusion. Concentrations within the therapeutic range were obtained with both drugs. A significant increase in both AUC and mean plasma concentrations of theophylline was seen during erythromycin treatment. The plasma clearance of theophylline was reduced in 9 of the 10 subjects. Renal clearance increased correspondingly, but the change was not statistically significant. Serum concentrations of erythromycin fell significantly, by more than 30%, with concurrent theophylline medication. We conclude that an interaction between theophylline and erythromycin, affecting both drugs, can be shown with concentrations of the drugs within the therapeutic range.
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