| 41. |
- Olsson, Lars E., 1971, et al.
(författare)
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The dyadic subsidy game: Effects of uncertain and changing subsidies on price setting
- 2004
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Ingår i: Poster presented at the 28th international congress of psychology, Beijing, China..
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In order to reduce sales (production) of environmentally harmful products we investigate the effects of subsidies that compensate producers for what they do not sell. A repeated duopoly price-setting game with imperfect price competition was devised. The results show that higher subsidies led to reduced sales and, as a consequence, higher price, and that uncertainty regarding the size of the subsidy did not change this. Furthermore, competition was not eroded by introducing the subsidy. The results also indicate that the theoretical framework of dyadic price negotiation is applicable to the dyadic subsidy game. We conclude that such a subsidy system may be used as a regulating mechanism in order to reduce sales (and thereby production) of environmentally harmful products or as a tool to restrain the overharvesting of finite resources
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| 42. |
- Olsson, Niclas, et al.
(författare)
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Grading breast cancer tissues using molecular portraits.
- 2013
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Ingår i: Molecular & Cellular Proteomics. - 1535-9484. ; 12:12, s. 3612-3623
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Tidskriftsartikel (refereegranskat)abstract
- Tumor progression and prognosis of breast cancer patients is difficult to assess using current clinical and laboratory parameters, where a pathological grading is indicative of tumor aggressiveness. This grading is based on assessment of nuclear grade, tubule formation, and mitotic rate. We report here the first protein signatures associated with histological grades of breast cancer, using a novel affinity proteomics approach. We profiled 52 breast cancer tissue samples, by combining nine antibodies and label-free LC-MS/MS, which generated detailed quantified proteomic maps representing 1,388 proteins. The results showed that we could define in-depth molecular portraits of histologically graded breast cancer tumors. Consequently, a 49-plex candidate tissue protein signature was defined that discriminated between histological grade 1, 2, and 3 of breast cancer tumors with high accuracy. Highly biologically relevant proteins were identified, and the differentially expressed proteins indicated further support for the current hypothesis regarding remodeling of tumor microenvironment during tumor progression. The protein signature was corroborated using meta-analysis of transcriptional profiling data from an independent patient cohort. In addition, the potential for using the markers to estimate the risk of distant metastasis free survival was also indicated. Taken together, these molecular portraits could pave the way for improved classification and prognostication of breast cancer.
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| 43. |
- Olsson, Petter, et al.
(författare)
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A single step reversed-phase high performance liquid chromatography separation of polar and non-polar lipids
- 2014
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Ingår i: Journal of Chromatography A. - : Elsevier BV. - 0021-9673 .- 1873-3778. ; 1369, s. 105-115
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Tidskriftsartikel (refereegranskat)abstract
- This paper reports a simple chromatographic system to separate lipids classes as well as their molecular species. By the use of phenyl coated silica as stationary phase in combination with a simple mobile phase consisting of methanol and water, all tested lipid classes elute within 30min. Furthermore, a method to accurately predict retention times of specific lipid components for this type of chromatography is presented. Common detection systems were used, namely evaporative light scattering detection (ELSD), charged aerosol detection (CAD), electrospray mass spectrometry (ESI-MS), and UV detection.
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| 44. |
- Olsson, Petter, et al.
(författare)
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Attention deficit hyperactivity disorder in adults who present with self-harm : a comparative 6-month follow-up study
- 2022
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Ingår i: BMC Psychiatry. - : BioMed Central. - 1471-244X. ; 22:1
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Tidskriftsartikel (refereegranskat)abstract
- Background: ADHD is common in psychiatric populations. This study aimed to compare clinical characteristics in adults with and without ADHD who presented with self-harm, and to compare later risk of suicidal behaviour within 6 months.Methods: Eight hundred four adults presented with self-harm (with and without suicidal intent) at psychiatric emergency services at three Swedish hospitals. Persons with a discharge ICD-10 diagnosis F90.0-F90.9 or a prescription for ADHD medication were considered to have ADHD (n = 93). Medical records were reviewed for evidence of subsequent suicide attempts (SA) within 6 months; suicides were identified by national register.Results: Recent relationship problems were more prevalent in the ADHD group. While the index episodes of those with ADHD were more often non-suicidal, and actual SAs more often rated as impulsive, medical lethality at presentation did not differ in attempters with and without ADHD. Subsequent SAs (fatal or non-fatal) were observed in 29% of the ADHD group and 20% in all others (P = .005). A logistic regression model showed elevated risk of suicidal behaviour during follow-up in the ADHD group (OR = 1.70, CI 1.05–2.76), although a final regression model suggested that this association was partly explained by age and comorbid emotionally unstable personality disorder.Conclusions: Findings highlight the need for clinicians to take self-harm seriously in adults with ADHD.
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| 45. |
- Olsson, Petter, et al.
(författare)
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Class separation of lipids and polycyclic aromatic hydrocarbons in normal phase high performance liquid chromatography - A prospect for analysis of aromatics in edible vegetable oils and biodiesel exhaust particulates
- 2014
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Ingår i: Journal of Chromatography A. - : Elsevier BV. - 0021-9673 .- 1873-3778. ; 1360, s. 39-46
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Tidskriftsartikel (refereegranskat)abstract
- The retention characteristics of the major lipid components in biodiesels and edible oils as well as representative polycyclic aromatic compounds (PAHs) have been investigated on five different normal phase HPLC stationary phases, in order to optimize class separation for an automatized online HPLC cleanup of PAHs prior GC-MS analysis. By stepwise comparison of different hexane/MTBE compositions as mobile phases on cyano-, phenyl-, pentabromobenzyl-, nitrophenyl- and amino- modified silica columns, the capacity and selectivity factors for each analyte and column could be calculated. It was concluded that the most suitable column for backflush isolation of PAHs in biodiesel and edible oil matrices was the pentabromobenzyl-modified silica (PBB). A previously described online HPLC-GC-MS system using the PBB column was then evaluated by qualitative and quantitative analysis of a biodiesel exhaust particulate extract and a vegetable oil reference material. The GC-MS full scan analysis of the biodiesel particulate extract showed that the lipids had been removed from the sample and a fraction containing PAHs and oxygenated derivatives thereof had been isolated. Quantified mass fractions of PAHs of the reference material BCR-458 agreed well for most of the certified PAH mass fractions in the spiked coconut oil reference material.
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| 46. |
- Olsson, Petter, et al.
(författare)
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Clinical characteristics and 6-month follow-up of adults with and without alcohol use disorder who self-harm
- 2024
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Ingår i: Frontiers in Psychiatry. - : Frontiers Media S.A.. - 1664-0640. ; 15
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Tidskriftsartikel (refereegranskat)abstract
- Background: Alcohol use disorder (AUD) is associated with suicidal behavior, but prospective clinical studies are lacking. Aim: To compare clinical characteristics and 6-month outcomes in persons with and without AUD who self-harm.Methods: 804 adults (mean age 33, age range 18-95, 541 women and 263 men, 666 with suicide attempts and 138 with non-suicidal self-injuries at index) at three Swedish university hospitals took part in a research interview that included the Mini International Neuropsychiatric Interview (MINI). Subsequent non-fatal suicidal behavior within six months was identified by record review; suicides were identified by national register.Results: At index, 39% of the men and 29% of the women had AUD. Over two thirds of these cases (69%) were identified by the MINI, but not by clinical AUD diagnosis. While trait impulsivity was more common among persons with AUD than those without (56% vs 36%, P adj = <.001), impulsivity in connection with the index attempt was noted in half of the participants in each group (48% vs 52%, P adj = 1). Subsequent suicidal behavior (fatal/non-fatal) occurred in 67 persons with AUD (26%) and in 98 without AUD (18%), a 60% higher risk among persons with AUD (OR = 1.60, 95% [CI 1.13-2.28], P =.009). Four persons with AUD (2%) and six without (1%) died by suicide within 6 months.Conclusion: Almost a third of patients presenting at psychiatric emergency settings after self-harm fulfilled criteria for AUD, but clinicians often missed this diagnosis. Risk for subsequent suicidal behavior was elevated in patients with AUD. Educational interventions to improve recognition of alcohol use disorder may aid clinicians in the assessment and management of patients who present with self-harm.
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| 47. |
- Olsson, Petter, et al.
(författare)
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Cognitive Function in Older Suicide Attempters and a Population-Based Comparison Group
- 2016
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Ingår i: Journal of Geriatric Psychiatry and Neurology. - : SAGE Publications. - 0891-9887 .- 1552-5708. ; 29:3, s. 133-41
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Tidskriftsartikel (refereegranskat)abstract
- The aim was to compare cognitive function in older suicide attempters with a population-based comparison group. METHODS: Hospitalized suicide attempters aged 70 years and older were assessed cognitively at baseline (n = 99) and 1-year follow-up (n = 59). Depression symptoms were rated with the Montgomery-Åsberg Depression Rating Scale (MADRS). Results of cognitive assessments in attempters were compared with results in nonattempter comparison subjects (n = 115) selected among participants in our population-based health studies to yield a similar distribution of MADRS scores. RESULTS: Suicide attempters scored lower on Mini-Mental State Examination (MMSE) than comparison persons. Among attempters, the mean MMSE score was lower in those with medically serious attempts. Attempters displayed poorer performance on tests of pentagon drawing and abstract thinking compared to comparison persons, and the results remained also after exclusion of those with medically serious attempts. At 1-year follow-up, significant improvement in MADRS scores was observed in the attempters. No evidence of improvement could be shown regarding cognitive deficits. CONCLUSION: Older suicide attempters may have cognitive deficits, which may in part be related to the attempt itself. This needs to be taken into account when designing intervention strategies.
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| 48. |
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| 49. |
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| 50. |
- Olsson, Petter, 1981-
(författare)
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Essentially Lipids : Analytical methods for the characterization of lipid materials
- 2015
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis describes analytical methods for chromatographic characterizations of lipids in biological and technical systems.Lipids are a group of compounds with a central role in all known forms of life. In addition to the biological roles, lipids are also components in many products of our daily usage. The application areas include food, pharma, cosmetics, biofuels, etc.Analytical characterization of lipids is challenging since a typical lipid extract often contains several hundred unique compounds which also could vary significantly in chemical properties. Separation is in many cases crucial for identification and quantification of individual lipids and here high performance liquid chromatography (HPLC) is regarded as the technique of first choice today.In the present work, methodologies for both normal phase (NP) and reversed phase (RP) HPLC are presented. The focus has been to develop methods that are fast, have low analytical complexity and are compatible with several detection systems. Cyanopropyl coated silica was evaluated as stationary phase for NP-HPLC with the aim to separate all the lipid classes in common lipid extracts. The analytes were eluted with a binary mobile phase system based on hexane, toluene and methanol which yielded in a total runtime of 30 minutes. In a subsequent study, additional stationary phases for NP-HPLC were evaluated for online sample cleanup of polycyclic aromatic hydrocarbons (PAHs) in lipid matrixes. In the demonstrated methodology for RP-HPLC, a binary system consisting of methanol/water was utilized with phenylpropyl coated silica to elute all tested lipid classes in 30 minutes.The methodologies were compatible with various detection techniques including evaporative light scattering detection (ELSD), charged aerosol detection (CAD) as well as electrospray mass spectrometry (ESI-MS) and were applied to characterize lipid materials of both biological and technical nature.
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