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- Holm, Einar, 1942-, et al.
(författare)
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Dynamic microsimulation
- 2000
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Ingår i: Spatial Models and GIS. - London : Taylor & Francis. - 0748408460 ; , s. 143-165
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Bokkapitel (refereegranskat)
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- Ivanov, A G, et al.
(författare)
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Photosynthetic electron transport adjustments in overwintering Scots pine (Pinus sylvestris L.)
- 2001
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Ingår i: Planta. - 0032-0935 .- 1432-2048. ; 213:4, s. 575-585
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Tidskriftsartikel (refereegranskat)abstract
- As shown before [C. Ottander et al. (1995) Planta 197:176-183], there is a severe inhibition of the photosystem (PS) II photochemical efficiency of Scots pine (Pinus sylvestris L.) during the winter. In contrast, the in vivo PSI photochemistry is less inhibited during winter as shown by in vivo measurements of DeltaA(820)/Delta (820) (P700(+)). There was also an enhanced cyclic electron transfer around PSI in winter-stressed needles as indicated by 4-fold faster reduction kinetics of P700(+). The differential functional stability of PSII and PSI was accompanied by a 3.7-fold higher intersystem electron pool size, and a 5-fold increase in the stromal electron pool available for P700(+) reduction. There was also a strong reduction of the QB band in the thermoluminescence glow curve and markedly slower Q-A re-oxidation in needles of winter pine, indicating an inhibition of electron transfer between QA and QB. The data presented indicate that the plastoquinone pool is largely reduced in winter pine, and that this reduced state is likely to be of metabolic rather than photochemical origin. The retention of PSI photochemistry, and the suggested metabolic reduction of the plastoquinone pool in winter stressed needles of Scots pine are discussed in terms of the need for enhanced photoprotection of the needles during the winter and the role of metabolically supplied energy for the recovery of photosynthesis from winter stress in evergreens.
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- Jonsson, Gunilla, 1967-
(författare)
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Rotad, rotlös, rastlös : Ung mobilitet i tid och rum
- 2003
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The overall aim of this thesis is to survey and analyse young peoples’ geographical movements, and illustrate the similarities and differences that exist between different individuals.. The aim of the thesis is also to examine and discuss youth’s attitudes and motivation for different forms of geographical mobility. The youth focused on in this project reside in Norrland. The first phase, Mapping of the Geographical Movement of Youth, was carried out through the use of a questionnaire, sent to graduating students in upper secondary school. The second phase, Umeå Students Abroad, was carried out by interviewing Umeå students who had either completed or were about to begin a period of foreign exchange. The third phase, Emigrants from Sweden, is based on statistics acquired from Sweden Statistics’ (SCB) and from the TOPSWING database. Home: The starting point of this thesis is the conception of “home”. The choice of path to take in life, and where students wanted to live in the future had significance for how they examined the choice between moving and staying; and the role of the home town in a longer perspective as to how the students viewed Umeå. Away: It is not just the place that a person comes from that says something about who she is, but also the place where she is going and the way in which she takes herself there. Many of the upper secondary school students that took part in the questionnaire had been abroad one or more times. Furthermore, many of the students would like to travel abroad again. At the same time, it can be said that there are also young people that do not have extensive experiences in travelling to other countries. Somewhere between home and away: The study shows that students may have very different views of their time abroad. The Tourist Student is one who chooses his/her destination in order to fulfil certain criteria and then mainly stays in the university town, “taking one day at a time.” He or she does not have a thought-out strategy for how the stay abroad should be carried out. The Travelling Student is the student who searches for a particular destination and later also has the ambition to get to know the country and the people that live there. The travelling student can be said to have a thought-out strategy for how to make the most out of his or her time in a foreign country. When away becomes home – or when home becomes home again: The interview study shows that to live abroad or to live in Sweden acquired a different meaning if you had a family. To have a family gives rise to a reason why one may choose to move back to Sweden. On the other hand there were also students for whom the home country was not important. A large portion of those who emigrated from Sweden during the study period moved back again. For those with a college or university education, a few years abroad can be a part of their choice of life path. It is something that one wants and from a career prospective, possibly should do. Rooted, rootless or restless young? The rooted are those who mainly live their entire lives in one place. The rootless represent a mobile life, where there is no home base, instead they create new ones as life passes. I would like to characterise most of the young people that in one way or another is featured in my study as restless. The restless combine, in different ways, the characteristics of both the rooted and the rootless. They are not unwilling to move, within the country, as well as to other countries, but they are at the same time rooted in their home town or in their home country.
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