| 1. |
- Niemi, MEK, et al.
(författare)
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- 2021
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swepub:Mat__t
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| 2. |
- Kanai, M, et al.
(författare)
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- 2023
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swepub:Mat__t
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| 3. |
- Buntgen, U., et al.
(författare)
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Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE
- 2018
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 9
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Tidskriftsartikel (refereegranskat)abstract
- Though tree-ring chronologies are annually resolved, their dating has never been independently validated at the global scale. Moreover, it is unknown if atmospheric radiocarbon enrichment events of cosmogenic origin leave spatiotemporally consistent fingerprints. Here we measure the 14C content in 484 individual tree rings formed in the periods 770–780 and 990–1000 CE. Distinct 14C excursions starting in the boreal summer of 774 and the boreal spring of 993 ensure the precise dating of 44 tree-ring records from five continents. We also identify a meridional decline of 11-year mean atmospheric radiocarbon concentrations across both hemispheres. Corroborated by historical eye-witness accounts of red auroras, our results suggest a global exposure to strong solar proton radiation. To improve understanding of the return frequency and intensity of past cosmic events, which is particularly important for assessing the potential threat of space weather on our society, further annually resolved 14C measurements are needed.
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| 4. |
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| 5. |
- Santangelo, James S., et al.
(författare)
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Global urban environmental change drives adaptation in white clover
- 2022
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Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 375
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Tidskriftsartikel (refereegranskat)abstract
- Urbanization transforms environments in ways that alter biological evolution. We examined whether urban environmental change drives parallel evolution by sampling 110,019 white clover plants from 6169 populations in 160 cities globally. Plants were assayed for a Mendelian antiherbivore defense that also affects tolerance to abiotic stressors. Urban-rural gradients were associated with the evolution of clines in defense in 47% of cities throughout the world. Variation in the strength of clines was explained by environmental changes in drought stress and vegetation cover that varied among cities. Sequencing 2074 genomes from 26 cities revealed that the evolution of urban-rural dines was best explained by adaptive evolution, but the degree of parallel adaptation varied among cities. Our results demonstrate that urbanization leads to adaptation at a global scale.
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| 6. |
- Andersson, Lena, 1965, et al.
(författare)
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Can access to psychiatric health care explain regional differences in disability pension with psychiatric disorders?
- 2007
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Ingår i: Soc Psychiatry Psychiatr Epidemiol. - : Springer Science and Business Media LLC. - 0933-7954 .- 1433-9285. ; 42:5, s. 366-71
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Psychiatric disorders are a serious public health problem, especially as many psychiatric disorders begin early in life. Disability pension (DP) with psychiatric diagnoses has, since the mid 1990s, increased in several European countries and regional differences within countries have emerged. It is not clear whether these regional differences are associated with differences in access to psychiatric health care. AIM: The aim of this study was to investigate whether regional differences in DP with psychiatric diagnoses in Norway were associated with differences in psychiatric service provision (the number of staff employed and psychiatric beds available). METHOD: The study population consisted of individuals aged 16-67 years living in Norway (n = 4,348,410) and six southern regions. Included cases were individuals who were granted a DP with a psychiatric diagnosis between 1 January and 31 December 1990, 1995 or 2000. Mental retardation was excluded. Data on cases were collected from the National Insurance Administration and data on psychiatric health care staff and beds was collected from Specialist Health Service, Statistics Norway. Regression models were used to calculate incidence rate ratios (IRR) with 95% confidence intervals (CI) using Norway as reference. RESULTS: Staffing levels (per 10,000 inhabitants) did not differ substantially between the regions, with the exception of Oslo that had about 70% higher numbers of staff employed. In regression analyses controlling for numbers of psychiatric staff and beds, regional differences in DP remained. Both men and women in the semi rural regions Aust-Agder and Vest-Agder were significantly more likely to receive a DP with a psychiatric diagnosis, while the IRR for DP was reduced in Ostfold. Different psychiatric staff groups were associated with increased or decreased rates of DP. The adjusted IRR between number of psychiatric staff (man-years of staff per 10,000 inhabitants) and DP with psychiatric diagnoses were: 1.23 (1.18-1.29) for psychologists, 1.13 (1.04-1.23) for physicians, 1.03 (1.00-1.07) for nurses and 0.84 (0.80-0.88) for auxiliary nurses. Furthermore, increased numbers of beds were associated with DP with a psychiatric diagnosis (IRR 2.86 (2.03-4.05) for 100 beds/10,000 population). CONCLUSION: Psychiatric provision (in terms of both staff and beds) was associated with the incidence of DP with psychiatric diagnoses but regional differences in provision did not explain the regional differences in DP with a psychiatric diagnosis. Future work needs to examine whether differences in case detection and case management are associated with regional differences in DP with psychiatric diagnoses.
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| 7. |
- Andersson, Lena, 1965, et al.
(författare)
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Disability pension for psychiatric disorders: Regional differences in Norway 1988-2000
- 2006
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Ingår i: Nord J Psychiatry. ; 60:4, s. 255-62
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to describe regional differences in the incidence of disability pensions (DPs) with psychiatric diagnoses, and to determine whether these differences were related to age and/or gender. We compared the incidence rates of new DPs including all diagnoses, with DP with psychiatric diagnoses in Norwegian regions from 1988 to 2000. The population at risk was all individuals aged 16-67 in each year. Individuals already on DP were excluded. Cases were collected from the Norwegian National Insurance Administration. The results showed that the incidence rate ratio (IRR; Norway reference) for DP with psychiatric diagnoses was most elevated for men 1.41 (95% CI 1.27-1.58) and women 1.48 (95% CI 1.34-1.64) living in the most rural region. Men in the urban area had a higher IRR, 1.33 (95% CI 1.26-1.40), than urban women, 1.02 (95% CI 0.96-1.07). The incidence more than doubled in the youngest age group (16-29 years) and decreased in the oldest age group (60-67 years) between 1988 and 2000. The findings conclude that individuals living in semi-rural regions of Norway are more likely to receive a DP with a psychiatric diagnosis than those living in urban areas. Large gender differences were found in the urban area. Further research is needed to investigate the impact of the psychiatric healthcare system and access to rehabilitation on psychiatric disability.
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| 8. |
- Wilson, R., et al.
(författare)
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Improved dendroclimatic calibration using blue intensity in the southern Yukon
- 2019
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Ingår i: The Holocene. - : SAGE Publications. - 0959-6836 .- 1477-0911. ; 29:11, s. 1817-1830
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Tidskriftsartikel (refereegranskat)abstract
- In north-western North America, the so-called divergence problem (DP) is expressed in tree ring width (RW) as an unstable temperature signal in recent decades. Maximum latewood density (MXD), from the same region, shows minimal evidence of DP. While MXD is a superior proxy for summer temperatures, there are very few long MXD records from North America. Latewood blue intensity (LWB) measures similar wood properties as MXD, expresses a similar climate response, is much cheaper to generate and thereby could provide the means to profoundly expand the extant network of temperature sensitive tree-ring (TR) chronologies in North America. In this study, LWB is measured from 17 white spruce sites (Picea glauca) in south-western Yukon to test whether LWB is immune to the temporal calibration instabilities observed in RW. A number of detrending methodologies are examined. The strongest calibration results for both RW and LWB are consistently returned using age-dependent spline (ADS) detrending within the signal-free (SF) framework. RW data calibrate best with June-July maximum temperatures (Tmax), explaining up to 28% variance, but all models fail validation and residual analysis. In comparison, LWB calibrates strongly (explaining 43-51% of May-August Tmax) and validates well. The reconstruction extends to 1337 CE, but uncertainties increase substantially before the early 17th century because of low replication. RW-, MXD- and LWB-based summer temperature reconstructions from the Gulf of Alaska, the Wrangell Mountains and Northern Alaska display good agreement at multi-decadal and higher frequencies, but the Yukon LWB reconstruction appears potentially limited in its expression of centennial-scale variation. While LWB improves dendroclimatic calibration, future work must focus on suitably preserved sub-fossil material to increase replication prior to 1650 CE.
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