| 11. |
- Alatalo, Juha, 1966-, et al.
(författare)
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Pollen viability and limitation of seed production in a population of the circumpolar cushion plant, Silene acaulis (Caryophyllaceae)
- 2001
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Ingår i: Nordic Journal of Botany. - : Wiley. - 0107-055X .- 1756-1051. ; 21:4, s. 365-372
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Tidskriftsartikel (refereegranskat)abstract
- Pollen viability among genders and limitation of female seed production in a natural trioecious population of the circumpolar cushion plant Silene acaulis was examined. Pollen viability was estimated by an in vitro pollen germination experiment. Both male and hermaphrodite flowers displayed large variation in pollen viability (0-53% in hermaphrodite and 0-54% in male flowers). There was a significant difference between genders in pollen viability: male plants had on average higher pollen viability than hermaphrodite plants. Resource and pollen limitation of seed production was studied by an experiment consisting of three treatments; (I) hand-pollination and removal of all other flowers on the cushion, (II) harid-pollination without removal of other flowers, and (III) open pollination without removal of flowers, Hand-pollination increased seed production, whereas removal of flowers had no effect on seed production. Abortion of pollinated ovules during seed development and seed mass did not differ among treatments. To control for effect of fruit number on seed production, data from naturally pollinated individuals was used. There was a positive correlation between both total number of seeds and fruit number, mean seed number per fruit and fruit number, respectively. These results indicate that seed production of S. acaulis is mainly limited by pollen availability whereas resource competition between fruits is not important as a limiting factor. The possible role of male quality differences between genders and pollen limitation of seed production for maintenance of trioecious reproductive systems is discussed.
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| 12. |
- Alatalo, Juha, 1966-, et al.
(författare)
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Response to simulated climatic change in an alpine and subarctic pollen-risk strategist, Silene acaulis
- 1997
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Ingår i: Global Change Biology. - : Wiley. - 1365-2486 .- 1354-1013. ; 3, s. 74-79
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to test if early no overing species respond with increased seed production to climate warming as is predicted for late-flowering seed-risk strategists. Experimental climate warming of about 3 degrees C was applied to two populations of the cushion-forming plant Silene acaulis (L.) Jacq. The experiment was run at one subarctic site and one alpine site for 2 years and 1 year, respectively, using open-top chambers (OTC). The 2-year temperature enhancement at the subarctic site had a marked effect on the flowering phenology. Cushions inside the OTC started flowering substantially earlier than control cushions. Both the male and female phases developed faster in the OTCs, and maturation of capsules occurred earlier. The cushions also responded positively in reproductive terms and produced more mature seeds and had a higher seed/ovule ratio. After 1 year temperature enhancement at the alpine site there was a weak trend for earlier flowering, but there was no significant difference in seed production or seed/ovule ratio.
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| 13. |
- Almquist, Martin, et al.
(författare)
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Order-preserving interpolation for summation-by-parts operators at nonconforming grid interfaces
- 2019
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Ingår i: SIAM Journal of Scientific Computing. - : Society for Industrial and Applied Mathematics Publications. - 1064-8275 .- 1095-7197. ; 41:2, s. A1201-A1227
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Tidskriftsartikel (refereegranskat)abstract
- We study nonconforming grid interfaces for summation-by-parts finite difference methods applied to partial differential equations with second derivatives in space. To maintain energy stability, previous efforts have been forced to accept a reduction of the global convergence rate by one order, due to large truncation errors at the nonconforming interface. We avoid the order reduction by generalizing the interface treatment and introducing order-preserving interpolation operators. We prove that, given two diagonal-norm summation-by-parts schemes, order-preserving interpolation operators with the necessary properties are guaranteed to exist, regardless of the grid-point distributions along the interface. The new methods retain the stability and global accuracy properties of the underlying schemes for conforming interfaces.
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| 14. |
- Altman, Daniel, et al.
(författare)
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Anal sphincter lacerations and upright delivery postures - a risk analysis from a randomized controlled trial
- 2007
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Ingår i: International Urogynecology Journal. - : Springer Science and Business Media LLC. - 0937-3462 .- 1433-3023. ; 18:2, s. 141-146
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: To evaluate obstetric sphincter lacerations after a kneeling or sitting position at second stage of labor in a multivariate risk analysis model. MATERIALS AND METHODS: Two hundred and seventy-one primiparous women with normal pregnancies and spontaneous labor were randomized, 138 to a kneeling position and 133 to a sitting position. Medical data were retrieved from delivery charts and partograms. Risk factors were tested in a multivariate logistic regression model in a stepwise manner. RESULTS: The trial was completed by 106 subjects in the kneeling group and 112 subjects in the sitting group. There were no significant differences with regard to duration of second stage of labor or pre-trial maternal characteristics between the two groups. Obstetrical sphincter tears did not differ significantly between the two groups but an intact perineum was more common in the kneeling group (p<0.03) and episiotomy (mediolateral) was more common in the sitting group (p<0.05). Three grade IV sphincter lacerations occurred in the sitting group compared to none in the kneeling group (NS). Multivariate risk analysis indicated that prolonged duration of second stage of labor and episiotomy were associated with an increased risk of third- or fourth-degree sphincter tears (p<0.01 and p<0.05, respectively). Delivery posture, maternal age, fetal weight, use of oxytocin, and use of epidural analgesia did not increase the risk of obstetrical anal sphincter lacerations in the two upright postures. CONCLUSION: Obstetrical anal sphincter lacerations did not differ significantly between a kneeling or sitting upright delivery posture. Episiotomy was more common after a sitting delivery posture, which may be associated with an increased risk of anal sphincter lacerations. Upright delivery postures may be encouraged in healthy women with normal, full-term pregnancy.
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| 15. |
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| 16. |
- Andersson, Anna Karin, et al.
(författare)
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Meaningful everyday life situations from the perspective of children born preterm : A photo-elicitation interview study with six-year-old children
- 2023
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Ingår i: PLOS ONE. - : PUBLIC LIBRARY SCIENCE. - 1932-6203. ; 18:8
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Tidskriftsartikel (refereegranskat)abstract
- AimThe aim of the study was to explore meaningful everyday life situations as perceived by six-year-old children born preterm. Materials and methodsThe study had a descriptive qualitative design with an inductive approach. Ten, six-year-old children born preterm, not diagnosed with any disabilities, participated. Data was collected by photo-elicitation interviews to stimulate and help the children to describe their meaningful everyday life situations. A qualitative content analysis according to Elo and Kyngas was applied. ResultsThe children's descriptions of meaningful everyday life situations can be understood as being in an active and dynamic process, representing the core category. The analysis resulted in three generic categories, as the children described the significance of having significant circumstances and doing things. The experiences the children gain when they do things create their desire for further development. DiscussionThe results reveal that children born preterm are able to reflect on and give detailed descriptions of situations of importance to them. The study suggests that if six-year-old children born preterm are given the opportunity to share their views they can take an active role e.g. in planning and carrying through of interventions by health care services.
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| 17. |
- Andersson, Anna Karin, et al.
(författare)
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Patterns of everyday functioning in preschool children born preterm and at term
- 2017
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Ingår i: Research in Developmental Disabilities. - : Elsevier BV. - 0891-4222 .- 1873-3379. ; 67, s. 82-93
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Tidskriftsartikel (refereegranskat)abstract
- Background/Aim: Children born preterm are at risk of neonatal complications but the long-term consequences for everyday functioning is not well known. The study aimed to identify patterns of everyday functioning in preschool children born preterm and at term in relation to perinatal data, neonatal risk factors, behaviour, and socioeconomic status. Registry data and data from parent rated questionnaires were collected for 331 children.Method: A person-oriented approach with a cluster analysis was used.Results: A seven cluster solution explained 65.91% of the variance. Most children (n = 232) showed patterns of strong everyday functioning. A minority of the children (n = 99), showed diverse patterns of weak everyday functioning. Perinatal characteristics, neonatal risk factors and socio-economics did not predict cluster group membership. Children born preterm were represented in all clusters.Conclusion, implications: Most preschool children are perceived by their parents with strong everyday functioning despite being born preterm. However small groups of children are, for various reasons, perceived with weak functioning, but preterm birth is not the sole contributor to patterns of weak everyday functioning. More critical for all children's everyday functioning is probably the interaction between individual factors, behavioural factors and contextual factors. To gain a broader understanding of children's everyday functioning. Child Health Services need to systematically consider aspects of body function, activity and in addition participation and environmental aspects.
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| 18. |
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| 19. |
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| 20. |
- Andersson, Helena, et al.
(författare)
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Communication at work : The communicative situation of immigrants at Swedish workplaces
- 2005
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Ingår i: The immigrant and the workplace. - Uppsala : FUMS, Institutionen för nordiska språk vid Uppsala universitet. ; , s. 20-
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Bokkapitel (populärvet., debatt m.m.)abstract
- Genom intervjuer och fallstudier kartläggs och analyseras ett antal invandrares kommunikativa arbetsvardag med avseende på såväl muntlig som skriftlig produktion. Syftet med analyserna är att finna kommunikativa faktorer som har en positiv inverkan på invandrares integration på arbetsplatsen och med sina kolleger.
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