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- Bergström, Denise
(author)
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Words in school : A study of vocabulary learning support in the Swedish EFL classroom
- 2023
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Doctoral thesis (other academic/artistic)abstract
- Vocabulary is a central but difficult aspect of learning English. EFL students face a considerable challenge in acquiring a vocabulary sufficient for communication, which means knowing many words and having a deep and varied knowledge of them. Researchers therefore argue that students need support to succeed in this endeavor, especially in an instructional context, where time and language exposure are limited. Although vocabulary research has provided many insights as concerns the nature of vocabulary learning, little is known about vocabulary learning in school. This thesis investigates vocabulary learning support in the Swedish secondary school EFL classroom in four empirical studies. The overall purpose of the studies was to illuminate the vocabulary component in areas that structure and organize the EFL classroom. It comprises two qualitative interview studies with teachers (n = 14) and materials developers (n = 8) respectively, and two content analyses of teaching materials focusing on the target words and learning conditions provided in the reading texts and the accompanying vocabulary exercises. The results illuminate how vocabulary is positioned and how the vocabulary component is treated in the classroom. The findings from the interview studies show that although the teachers and the materials developers stated that vocabulary is important, they attested to not perceiving vocabulary as a prominent aspect of the EFL classroom. This was found to be a result of their understanding of vocabulary development as an incidental process. Much in the same vein, the interviewees expressed that they do not prioritize working explicitly with vocabulary in class and rely on words to be acquired when students engage in other activities. The results also show that the vocabulary component in the classroom is mainly unplanned, both in regard to both target words and vocabulary learning activities. Neither the teachers nor the materials developers reported any systematic approaches to planning vocabulary instruction. Similarly, the teaching material analyses reveal that the vocabulary component is not structured in a way that is in accordance with research-based suggestions. The thesis indicates that the Swedish EFL classroom is unlikely to provide sufficient vocabulary learning support, which, in turn, can have considerable implications for students’ learning in school. The findings are discussed in relation to central contextual factors such as communicative language teaching, the Swedish curriculum and extramural English.
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- Eurenius, Eva, et al.
(author)
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Maternal and paternal self-rated health and BMI in relation to lifestyle in early pregnancy: The Salut Programme in Sweden
- 2011
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In: Scandinavian Journal of Public Health. - Stockholm : Taylor & Francis. - 1403-4948 .- 1651-1905. ; 39:7, s. 730-741
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Journal article (peer-reviewed)abstract
- Aim: This study’s aim was to increase knowledge about maternal and paternal self-rated health and body mass index in relation to lifestyle during early pregnancy. Methods: Study subjects were expectant parents visiting antenatal care (2006—07) as part of the Salut Programme in northern Sweden. During early pregnancy, 468 females and 413 male partners completed questionnaires. The questions addressed sociodemography, self-rated general health, weight and height, satisfaction with weight, and lifestyle, such as dietary habits, physical activity, sleeping pattern, and alcohol, tobacco, and drug use. Results: Most rated their general health as good, very good, or excellent, although women less often than men (88% and 93%). The sex difference was more prominent when restricting the comparison to self-rated health being very good or excellent - 49% of the women compared to 61% of the men. Being overweight or obese was common (53% of the men and 30% of the women). Few participants fulfilled the national recommendations with respect to a health-enhancing lifestyle; this was somewhat more common for women than men. Expectant parents with normal body mass index and vigorous physical activity were more likely to have very good or excellent self-rated health. Conclusions: Most expectant parents perceived their general health as good, although this perception was less for women than men. Being overweight and having a non-health-enhancing lifestyle were more common for men than women. Thus, there is need for more powerful health-promoting interventions for expectant parents.
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- Forsare, Carina, et al.
(author)
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Non-linear transformations of age at diagnosis, tumor size, and number of positive lymph nodes in prediction of clinical outcome in breast cancer
- 2018
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In: BMC Cancer. - : Springer Science and Business Media LLC. - 1471-2407. ; 18:1
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Journal article (peer-reviewed)abstract
- Background: Prognostic factors in breast cancer are often measured on a continuous scale, but categorized for clinical decision-making. The primary aim of this study was to evaluate if accounting for continuous non-linear effects of the three factors age at diagnosis, tumor size, and number of positive lymph nodes improves prognostication. These factors will most likely be included in the management of breast cancer patients also in the future, after an expected implementation of gene expression profiling for adjuvant treatment decision-making. Methods: Four thousand four hundred forty seven and 1132 women with primary breast cancer constituted the derivation and validation set, respectively. Potential non-linear effects on the log hazard of distant recurrences of the three factors were evaluated during 10 years of follow-up. Cox-models of successively increasing complexity: dichotomized predictors, predictors categorized into three or four groups, and predictors transformed using fractional polynomials (FPs) or restricted cubic splines (RCS), were used. Predictive performance was evaluated by Harrell's C-index. Results: Using FP-transformations, non-linear effects were detected for tumor size and number of positive lymph nodes in univariable analyses. For age, non-linear transformations did, however, not improve the model fit significantly compared to the linear identity transformation. As expected, the C-index increased with increasing model complexity for multivariable models including the three factors. By allowing more than one cut-point per factor, the C-index increased from 0.628 to 0.674. The additional gain, as measured by the C-index, when using FP- or RCS-transformations was modest (0.695 and 0.696, respectively). The corresponding C-indices for these four models in the validation set, based on the same transformations and parameter estimates from the derivation set, were 0.675, 0.700, 0.706, and 0.701. Conclusions: Categorization of each factor into three to four groups was found to improve prognostication compared to dichotomization. The additional gain by allowing continuous non-linear effects modeled by FPs or RCS was modest. However, the continuous nature of these transformations has the advantage of making it possible to form risk groups of any size.
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- Gundale, Michael, et al.
(author)
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The biological controls of soil carbon accumulation following wildfire and harvest in boreal forests : a review
- 2024
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In: Global Change Biology. - : John Wiley & Sons. - 1354-1013 .- 1365-2486. ; 30:5
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Research review (peer-reviewed)abstract
- Boreal forests are frequently subjected to disturbances, including wildfire and clear-cutting. While these disturbances can cause soil carbon (C) losses, the long-term accumulation dynamics of soil C stocks during subsequent stand development is controlled by biological processes related to the balance of net primary production (NPP) and outputs via heterotrophic respiration and leaching, many of which remain poorly understood. We review the biological processes suggested to influence soil C accumulation in boreal forests. Our review indicates that median C accumulation rates following wildfire and clear-cutting are similar (0.15 and 0.20 Mg ha−1 year−1, respectively), however, variation between studies is extremely high. Further, while many individual studies show linear increases in soil C stocks through time after disturbance, there are indications that C stock recovery is fastest early to mid-succession (e.g. 15–80 years) and then slows as forests mature (e.g. >100 years). We indicate that the rapid build-up of soil C in younger stands appears not only driven by higher plant production, but also by a high rate of mycorrhizal hyphal production, and mycorrhizal suppression of saprotrophs. As stands mature, the balance between reductions in plant and mycorrhizal production, increasing plant litter recalcitrance, and ectomycorrhizal decomposers and saprotrophs have been highlighted as key controls on soil C accumulation rates. While some of these controls appear well understood (e.g. temporal patterns in NPP, changes in aboveground litter quality), many others remain research frontiers. Notably, very little data exists describing and comparing successional patterns of root production, mycorrhizal functional traits, mycorrhizal-saprotroph interactions, or C outputs via heterotrophic respiration and dissolved organic C following different disturbances. We argue that these less frequently described controls require attention, as they will be key not only for understanding ecosystem C balances, but also for representing these dynamics more accurately in soil organic C and Earth system models.
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- Gundale, Michael, et al.
(author)
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The biological controls of soil carbon accumulation following wildfire and harvest in boreal forests: A review
- 2024
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In: Global Change Biology. - 1354-1013 .- 1365-2486. ; 30
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Research review (peer-reviewed)abstract
- Boreal forests are frequently subjected to disturbances, including wildfire and clear-cutting. While these disturbances can cause soil carbon (C) losses, the long-term accumulation dynamics of soil C stocks during subsequent stand development is controlled by biological processes related to the balance of net primary production (NPP) and outputs via heterotrophic respiration and leaching, many of which remain poorly understood. We review the biological processes suggested to influence soil C accumulation in boreal forests. Our review indicates that median C accumulation rates following wildfire and clear-cutting are similar (0.15 and 0.20 Mg ha(-1) year(-1), respectively), however, variation between studies is extremely high. Further, while many individual studies show linear increases in soil C stocks through time after disturbance, there are indications that C stock recovery is fastest early to mid-succession (e.g. 15-80 years) and then slows as forests mature (e.g. >100 years). We indicate that the rapid build-up of soil C in younger stands appears not only driven by higher plant production, but also by a high rate of mycorrhizal hyphal production, and mycorrhizal suppression of saprotrophs. As stands mature, the balance between reductions in plant and mycorrhizal production, increasing plant litter recalcitrance, and ectomycorrhizal decomposers and saprotrophs have been highlighted as key controls on soil C accumulation rates. While some of these controls appear well understood (e.g. temporal patterns in NPP, changes in aboveground litter quality), many others remain research frontiers. Notably, very little data exists describing and comparing successional patterns of root production, mycorrhizal functional traits, mycorrhizal-saprotroph interactions, or C outputs via heterotrophic respiration and dissolved organic C following different disturbances. We argue that these less frequently described controls require attention, as they will be key not only for understanding ecosystem C balances, but also for representing these dynamics more accurately in soil organic C and Earth system models.
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- Gyllstad, Henrik, et al.
(author)
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Effects of Word Definitions on Meaning Recall : A Multisite Intervention in Language-Diverse Second Language English Classrooms
- 2022
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In: Language learning. - : John Wiley & Sons. - 0023-8333 .- 1467-9922. ; 73:2, s. 403-444
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Journal article (peer-reviewed)abstract
- Vocabulary experts recommend first language (L1) translation equivalentsfor establishing form–meaning mappings for new second language (L2) words, espe-cially for lower proficiency learners. Empirical evidence to date speaks in favor of L1translation equivalents over L2 meaning definitions, but most studies have investigatedbi- rather than multilingual learners. In our study, we investigated instructed Englishvocabulary learning through an intervention study in six language-diverse secondaryschool English classrooms in Sweden (N=74) involving three conditions for presen-tation of word meanings: (a) definitions in the L2 (English), (b) translation equivalentsin the shared school and majority language (Swedish), and (c) translation equivalents inthe shared school and majority language plus other prior languages among the learners(Swedish and other). Based on overall weighted mean effect sizes and mixed-effects modeling, the results showed that conditions that involved L1 translation equivalentsyielded higher scores than did target language definitions in immediate posttests with asmall effect size but no differences in delayed posttests.
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