| 1. |
- Fjällström, Pär, et al.
(författare)
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Drying of linseed oil paints: a laboratory study of aldehyde emissions
- 2002
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Ingår i: Industrial Crops and Products. ; 16:3, s. 173-84
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Tidskriftsartikel (refereegranskat)abstract
- The effects of temperature, air humidity, air exchange rate, artificial light and fatty acid constitution on the emissions of aldehydes from linseed oil paint were investigated. Experiments were designed using a multivariate approach and data were analysed using different projection methods (principal component analysis, partial least-squares). Paints used were produced out of two different types of oils, where the fatty acid chains were either mainly linoleic or linolenic acid. The paints were applied onto glass plates and dried in chambers with a controlled climate. Aldehydes were sampled using silica gel impregnated with 2,4-dinitrophenylhydrazine and analysed by HPLC with UV and MS detection. Consecutive sampling of aldehydes every eighth hour as well as total aldehyde sampling was performed during the first 5 days after application of the paints. Hexanal and propanal were the dominating aldehydes emitted for linoleic and linolenic acid rich paint, respectively. Temperature and humidity sped up the emission process, giving a higher total amount of aldehydes. A higher amount of linoleic acid slowed down the emission process and gave higher total amounts of aldehydes. Artificial light and air exchange rate showed no significant effects on the emission process.
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| 2. |
- Magnusson, R, et al.
(författare)
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Determination of chemical composition and mutagenicity in particles from chainsaw exhaust. Experimental set-up, stability and results from two different fuels
- 2000
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Ingår i: Environmental Technology. - 0959-3330. ; 21:7, s. 819-29
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Tidskriftsartikel (refereegranskat)abstract
- A dilution tunnel for sampling of particles and gaseous emissions in chainsaw exhaust was constructed and tested for reproducibility. In addition the equipment was used to measure chainsaw emissions when using two different fuels, aliphatic petrol with synthetic lubricating oil and regular lead-free petrol with mineral lubricating oil. The content of polycyclic aromatic hydrocarbons (PAH) and the mutagenicity of sampled particles were measured as well as the concentration of carbon monoxide (CO), nitrogen oxides (NOx) and aldehydes in the exhaust. particles were sampled isokinetically and collected on a filter followed by two polyurethane foam plugs (PUF) in series for sampling of the semivolatile components. PAH were analysed by a coupled liquid chromatography - gas chromatography (LC-GC) system and mutagenicity testing was carried out by using Ames Salmonella assay. The measured physical parameters as well as the particulate, semivolatile and gaseous emissions showed that reproducible measurements of exhaust emissions could be achieved using this experimental set-up. In terms of mutagenicity when testing for reproducibility, a small but significant effect was observed for the Salmonella strains TA98 and TA100 in the absence of a metabolizing system, both for the particulate phase and the semivolatile components. A significant difference was seen between the two different fuels tested, the conventional petrol with mineral oil having 5-10 times higher concentrations of different PAH compounds and a much higher mutagenic effect for all strains. This difference was seen both for the particulate phase and the semivolatile components.
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| 3. |
- Magnusson, Roger, et al.
(författare)
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Effect of Gasoline and Lubricant on Emissions and Mutagenicity of Particles and Semivolatiles in Chain Saw Exhaust
- 2000
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Ingår i: Environmental Science & Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 34:14, s. 2918-24
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Tidskriftsartikel (refereegranskat)abstract
- The exhaust from a two-stroke chain saw engine was characterized using two different types of gasoline, aliphatic gasoline and conventional lead-free gasoline, in combination with four lubricants differing in mineral oil, polyolester, and polyisobutylene (PIB) content. This characterization was focused on emissions of polycyclic aromatic hydrocarbons (PAH) and mutagenicity testing using Ames Salmonella assay. In addition, exhaust emissions of carbon monoxide (CO), nitrogen oxides (NOx), aldehydes, and hydrocarbons (HC) were measured. The two-stroke engine was tested in a test bench, and particulate, semivolatile, and gaseous exhaust components were sampled using a dilution tunnel. Much less PAH were emitted when using aliphatic gasoline due to a much lower gasoline content of PAH and aromatics than the conventional gasoline. Also about half the NOx emissions, up to 50% higher formaldehyde and acetaldehyde emissions, and 10% higher total HC emissions were observed for the aliphatic gasoline. The influence of lubricant on the studied exhaust emissions was found to be of minor importance. In terms of mutagenicity, significant effects were seen for six of the eight gasoline/lubricant combinations, and the highest effects were observed without a metabolizing system. Generally, the conventional gasoline gave higher effects than did the aliphatic gasoline. A difference between lubricants was also seen, especially in combination with gasoline A; however, the interpretation of mutagenic effects of the lubricants was not straightforward. Overall, one synthetic ester-based lubricant and one mineral oil-based lubricant gave the highest mutagenicity.
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| 4. |
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| 5. |
- TEDDY study group, The, et al.
(författare)
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The environmental determinants of diabetes in the young (TEDDY) study: Study design
- 2007
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Ingår i: Pediatric Diabetes. - : Hindawi Limited. - 1399-543X .- 1399-5448. ; 8:5, s. 286-298
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Tidskriftsartikel (refereegranskat)abstract
- The primary objective of this multicenter, multinational, epidemiological study is the identification of infectious agents, dietary factors, or other environmental exposures that are associated with increased risk of autoimmunity and type 1 diabetes mellitus (T1DM). Factors affecting specific phenotypic manifestations such as early age of onset or rate of progression or with protection from the development of T1DM will also be identified. The Environmental Determinants of Diabetes in the Young (TEDDY) is an observational cohort study in which newborns who are younger than 4 months and have high-risk human leukocyte antigen alleles in the general population or are first-degree relatives (FDRs) of patients affected with T1DM will be enrolled. Six clinical centers in the USA and Europe will screen 361 588 newborns, of which it is anticipated that 17 804 will be eligible for enrollment with just over 7800 followed. Recruitment will occur over 5 yr, with children being followed to the age of 15 yr. Identification of such factors will lead to a better understanding of disease pathogenesis and result in new strategies to prevent, delay, or reverse T1DM.
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| 6. |
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| 7. |
- Abraha, Aynalem, et al.
(författare)
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Breaking bad news in cancer care: preferences of patients, family caregivers and general public in Ethiopia
- 2021
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Ingår i: International Conference on Communication in Healthcare (ICCH) 2020 Part 2, 15-16 April, 2021.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This study explores the preferences of cancer patients, family caregivers, and the general public regarding breaking bad news in an Ethiopian oncology setting. The research was conducted at Tikur Anbessa (Black Lion) Specialized Hospital. The sample consists of patients with a confirmed cancer diagnosis, their family caregivers, and representatives from the general public with 150 subjects per cohort. A comparative cross-sectional study design and a multivariable analysis were used. The patients would like to be informed, which contradicts the perceptions of family caregivers. This creates an ethical dilemma for staff in terms of how much they involve their patients in clinical decision-making. The patients also indicate that information not to be withheld from them. In contrast, the general public prefers information about poor life expectancy to be communicated to family only, which may reflect widespread public perception of cancer as a deadly disease. The findings indicate the complexity of communication concerning breaking bad news in oncology care in Ethiopia. It requires oncologists to probe patient attitudes before information disclosure in order to find a balance between involving patients in communication at the same time as keeping a constructive alliance with family caregivers.
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| 8. |
- Abraha Woldemariam, Aynalem, et al.
(författare)
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Breaking Bad News in Cancer Care: Ethiopian Patients Want More Information Than What Family and the Public Want Them to Have.
- 2021
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Ingår i: JCO global oncology. - 2687-8941. ; 7, s. 1341-1348
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Tidskriftsartikel (refereegranskat)abstract
- This study explores the preferences of patients with cancer, family caregivers, and the general public regarding breaking bad news in an Ethiopian oncology setting.The study was conducted at Tikur Anbessa (Black Lion) Specialized Hospital. The sample consists of patients with a confirmed cancer diagnosis, their family caregivers, and representatives from the general public with 150 subjects per cohort. The study used a comparative cross-sectional design and multivariable data analysis.The patients would like to be informed, which contradicts the preferences of family caregivers. This creates an ethical dilemma for staff in terms of how much they involve their patients in clinical decision making. The patients also indicate that information should not be withheld from them. By contrast, the general public prefers information about poor life expectancy to be communicated to family only, which may reflect a widespread public perception of cancer as a deadly disease.The findings indicate the complexity of communication-related preferences concerning breaking bad news in oncology care in Ethiopia. It requires oncologists to probe patient attitudes before information disclosure to find a balance between involving patients in communication at the same time as keeping a constructive alliance with family caregivers.
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| 9. |
- Adolfsson, Päivi, et al.
(författare)
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Observed dietary intake in adults with intellectual disability living in the community
- 2008
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Ingår i: Food & Nutrition Research. - : Co-Action Publishing. - 1654-6628 .- 1654-661X. ; 52
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Tidskriftsartikel (refereegranskat)abstract
- Background: Knowledge is lacking about dietary habits among people with intellectual disability (ID) living in community residences under new living conditions.Objective: To describe the dietary habits of individuals with ID living in community residences, focusing on intake of food, energy and nutrients as well as meal patterns.Design: Assisted food records and physical activity records over a 3-day observation period for 32 subjects.Results: Great variation was observed in daily energy intake (4.9-14 MJ) dispersed across several meals, with on average 26% of the energy coming from in-between-meal consumption. Main energy sources were milk products, bread, meat products, buns and cakes. The daily intake of fruit and vegetables (320_221 g) as well as dietary fiber (21_99.6 g) was generally low. For four vitamins and two minerals, 19-34% of subjects showed an intake below average requirement (AR). The physical activity level (PAL) was low for all individuals (1.4_0.1).Conclusion: A regular meal pattern with a relatively high proportion of energy from in-between-meal eating occasions and a low intake of especially fruits were typical of this group of people with ID. However, the total intake of energy and other food items varied a great deal between individuals. Thus, every adult with ID has to be treated as an individual with specific needs. A need for more knowledge about food in general and particularly how fruit and vegetables could be included in cooking as well as encouraged to be eaten as inbetween-meals seems imperative in the new living conditions for adults with ID.
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| 10. |
- Almroth, Gabriel, 1953-, et al.
(författare)
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Perspectives on hepatitis B infections and the efficacy of vaccination (hepatitis B and pneumococci) in dialysis patients.
- 2003
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Ingår i: Upsala journal of medical sciences. - : Uppsala Medical Society. - 0300-9734 .- 2000-1967. ; 108:1, s. 61-74
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Tidskriftsartikel (refereegranskat)abstract
- Hepatitis B is a well known problem in dialysis units. We therefore examined the historical frequency of hepatitis B carriers in our unit, our vaccination program to hepatitis B virus (HBV), the response to hepatitis B vaccine, the IgG subclass response of anti-HBs and the response and IgG subclass response to pneumococcal vaccination (another vaccine) in dialysis patients. From 1970 and onwards 23 HBV carriers were found, but no new cases of hepatitis B occurred during the study period, i.e. from 1980 and onwards. Only one of the carriers was alive by the end of 2001. In four patients liver disease (in one of them liver cirrhosis) may have been a concomitant cause of death. The antibody response to hepatitis B vaccine was significantly lower in patients than in staff. In four patients a fourth injection was cancelled due to transplantation and bad health, while such data were lacking in 8 cases. In anti-HBs positive patients and controls a significant difference in the response of healthy adults was observed in anti-HBs IgG1 (p < 0.001) vs all other IgG subclasses. Dialysis patients had low levels, or negative findings, in all cases, with IgG1 as the highest proportion found (3/11 patients). An antibody response to pneumococcal vaccination was registered in 25 out of 29 dialysis patients (in all 86%). The IgG-subclass vaccination response to pneumococci in 28 dialysis patients was mainly IgG2 and IgG1 but also occurred in IgG3 and IgG4. Prevaccination antibody levels of the controls were higher in IgG1 and IgG2 (p < 0.01) (n = 21) than in dialysis patients (n = 28). Hepatitis B is nowadays a rare, but still dangerous disease in nephrology units. Dialysis patients have a reduced response to hepatitis B vaccine and vaccination schedules should be started early as some patients otherwise may not receive a fourth injection. The adequate antibody response to pneumococcal vaccination mainly due to IgG2 and IgG1 antibodies indicates that the antigen involved is important in vaccination responses in dialysis patients.
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| 11. |
- Andersson, Annika, 1961-, et al.
(författare)
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Challenges in project management : Grabbing the elephant
- 2007
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Ingår i: Projects & Profits. ; 7:12, s. 33-37
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Tidskriftsartikel (refereegranskat)abstract
- Projects and project management tend to have special meanings to the individuals involved in a specific line of research. This article reports on some topics covered in an informal Swedish network devoted to study project management. Ten topics are selected for discussion that fall into three broad categories—projects as practice, productivity in projects and education in a PM curriculum.
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| 12. |
- Andersson, Anton E, et al.
(författare)
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Delta NT-proBNP predicts cardiotoxicity in HER2-positive breast cancer patients treated with trastuzumab.
- 2021
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Ingår i: Acta oncologica (Stockholm, Sweden). - 1651-226X. ; 60:4, s. 475-481
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Tidskriftsartikel (refereegranskat)abstract
- Overall survival has improved significantly in patients with human epidermal growth receptor 2 (HER2)-positive breast cancer due to the use of the monoclonal antibody trastuzumab blocking HER2. However, patients may develop trastuzumab-induced cardiotoxicity (TIC) leading to congestive heart failure. Here we assessed whether analysing NT-proBNP and assessment of electrocardiography (ECG) could detect TIC during trastuzumab therapy.One hundred thirty-six patients undergoing adjuvant, neoadjuvant or palliative chemotherapy and HER2 blockade for HER2-positive breast cancer were prospectively assessed with echocardiography, ECG and N-terminal - pro hormone B-type natriuretic peptide (NT-proBNP) testing at baseline and at 6 and 12months of trastuzumab therapy. TIC was defined as a left ventricular ejection fraction (LVEF) of less than 50% and a decline from baseline of ≥10 units.Six patients developed TIC under 12months of trastuzumab therapy (incidence 4.4%). NT-proBNP increased from 198.8±64.0pg/ml to 678.7±132.4pg/ml (p<.05) in TIC patients. With a cut-off point of 276.5pg/ml for NTproBNP and increase in NT-proBNP by 75.8pg/ml from baseline the sensitivity was 100% and the specificity 95% to detect TIC. Compared with controls, TIC patients were older (68.3±1.1years and 56.2±1.4years, respectively; p<.01), had more often diabetes mellitus (OR = 63.5, 95% CI: 5.63-915, p<.01) and atrial fibrillation (OR = 12.3; 95% CI: 1.89-74.62; p<.05) and had lower baseline LVEF (57.1±1.4% and 61.4±0.3%, respectively; p<.001). Abnormal ECGs were common in patients developing TIC.Measuring changes in NTproBNP may be used to monitor patients for TIC under trastuzumab therapy. Patients with a cardiovascular risk profile are more at risk of developing TIC.
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| 13. |
- Andersson, Andreas, et al.
(författare)
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Public support for healthcare-mediated disclosure of hereditary cancer risk information: Results from a population-based survey in Sweden
- 2020
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Ingår i: Hereditary Cancer in Clinical Practice. - : Springer Science and Business Media LLC. - 1731-2302 .- 1897-4287. ; 18:1
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Tidskriftsartikel (refereegranskat)abstract
- Background Targeted surveillance of at-risk individuals in families with increased risk of hereditary cancer is an effective prevention strategy if relatives are identified, informed and enrolled in screening programs. Despite the potential benefits, many eligible at-risk relatives remain uninformed of their cancer risk. This study describes the general public's opinion on disclosure of hereditary colorectal cancer (CRC) risk information, as well as preferences on the source and the mode of information. Methods A random sample of the general public was assessed through a Swedish citizen web-panel. Respondents were presented with scenarios of being an at-risk relative in a family that had an estimated increased hereditary risk of CRC; either 10% (moderate) or 70% (high) lifetime risk. A colonoscopy was presented as a preventive measure. Results were analysed to identify significant differences between groups using the Pearson's chi-square (chi(2)) test. Results Of 1800 invited participants, 977 completed the survey (54%). In the moderate and high-risk scenarios, 89.2 and 90.6% respectively, would like to receive information about a potential hereditary risk of CRC (chi 2,p = .755). The desire to be informed was higher among women (91.5%) than men (87.0%, chi 2,p = .044). No significant differences were found when comparing different age groups, educational levels, place of residence and having children or not. The preferred source of risk information was a healthcare professional in both moderate and high-risk scenarios (80.1 and 75.5%). However, 18.1 and 20.1% respectively would prefer to be informed by a family member. Assuming that healthcare professionals disclosed the information, the favoured mode of information was letter and phone (38.4 and 33.2%). Conclusions In this study a majority of respondents wanted to be informed about a potential hereditary risk of CRC and preferred healthcare professionals to communicate this information. The two presented levels of CRC lifetime risk did not significantly affect the interest in being informed. Our data offer insights into the needs and preferences of the Swedish population, providing a rationale for developing complementary healthcare-assisted communication pathways to realise the full potential of targeted prevention of hereditary CRC.
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| 14. |
- Andersson, Barbro, 1940-
(författare)
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Analysis of plant growth regulating substances
- 1982
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Natural plant growth regulators (phytohormones) are a group of organic compounds which, in very small amounts, act as regulators of physiological processes in plants.Methods were developed for the analysis of phytohormones in samples from Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris (L.) Karst»). Identification of abscisic acid, 3-indoleacetic acid, gibbe-rellin Ag and the conjugate N-(3-indoleacetyl)aspartic acid was performed by GC-MS as their methyl esters. A quantitative determination of abscisic acid was made by GC-ECD and this method was also applied to anther samples of Anemone canadensis. 3-Indole-acetic acid and N-(3-indoleacetyl)aspartic acid were quantified by reversed-phase HPLC and spectrofluorimetric detection. Dichlorophene, used as a growth regulator in containerized seedlings of pine and spruce, was analysed by GC-MID in peat and paper.
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| 15. |
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| 16. |
- Andersson, Gerd, et al.
(författare)
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Upper-extremity Spasticity-reducing Treatment in Adjunct to Movement Training and Orthoses in Children with Cerebral Palsy at Gross Motor Function- and Manual Ability Classification System Levels IV-V : A Descriptive Study
- 2020
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Ingår i: Developmental Neurorehabilitation. - : Taylor & Francis. - 1751-8423 .- 1751-8431. ; 23:6, s. 349-358
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Tidskriftsartikel (refereegranskat)abstract
- Covering a 20-year period of work with children with severe cerebral palsy (CP) within a Swedish habilitation service, changes in passive wrist extension with fingers extended (PWE-FE) and current hand function are described and compared between children receiving systematic upper-extremity treatment with botulinum neurotoxin type A and intervention programs from before 7 years of age (Group 1, n = 7), those whom for various reasons did not undergo this treatment (Group 2, n = 10), and those not having the option to receive treatment until later during childhood/adolescence (Group 3, n = 8). Group 3 showed more critical and less normal PWE-FE values for both wrists, and poorer hand function scores, particularly compared with Group 1. Findings cautiously suggest that repeated upper-extremity spasticity-reducing treatment and movement training/orthoses from an early age may help prevent critical loss of passive range of motion of the wrist joint flexion/extension and promote hand function development in children with severe CP.
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| 17. |
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| 18. |
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| 19. |
- Andersson, Kristin, et al.
(författare)
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Implementing healthy lifestyle promotion in primary care: a quasi-experimental cross-sectional study evaluating a team initiative
- 2015
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Ingår i: BMC Health Services Research. - : BioMed Central. - 1472-6963. ; 15:31
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Tidskriftsartikel (refereegranskat)abstract
- Background:Non-communicable diseases are a leading cause of death and can largely be prevented by healthy lifestyles. Health care organizations are encouraged to integrate healthy lifestyle promotion in routine care. This study evaluates the impact of a team initiative on healthy lifestyle promotion in primary care.Methods: A quasi-experimental, cross-sectional design compared three intervention centres that had implemented lifestyle teams with three control centres that used a traditional model of care. Outcomes were defined using the RE-AIM framework: reach, the proportion of patients receiving lifestyle promotion; effectiveness, self-reported attitudes and competency among staff; adoption, proportion of staff reporting regular practice of lifestyle promotion; implementation, fidelity to the original lifestyle team protocol. Data collection methods included a patient questionnaire (n = 888), a staff questionnaire (n = 120) and structured interviews with all practice managers and, where applicable, team managers (n = 8). The chi square test and problem-driven content analysis was used to analyse the questionnaire and interview data, respectively.Results:Reach: patients at control centres (48%, n = 211) received lifestyle promotion significantly more often compared with patients at intervention centres (41%, n = 169). Effectiveness: intervention staff was significantly more positive towards the effectiveness of lifestyle promotion, shared competency and how lifestyle promotion was prioritized at their centre. Adoption: 47% of staff at intervention centres and 58% at control centres reported that they asked patients about their lifestyle on a daily basis. Implementation: all intervention centres had implemented multi-professional teams and team managers and held regular meetings but struggled to implement in-house referral structures for lifestyle promotion, which was used consistently among staff.Conclusions:Intervention centres did not show higher rates than control centres on reach of patients or adoption among staff at this stage. All intervention centres struggled to implement working referral structures for lifestyle promotion. Intervention centres were more positive on effectiveness outcomes, attitudes and competency among staff, however. Thus, lifestyle teams may facilitate lifestyle promotion practice in terms of increased responsiveness among staff, illustrated by positive attitudes and perceptions of shared competency. More research is needed on lifestyle promotion referral structures in primary care regarding their configuration and implementation.
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| 20. |
- Andersson, Kristofer, et al.
(författare)
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Mutations in COL1A1 and COL1A2 and dental aberrations in children and adolescents with osteogenesis imperfecta - A retrospective cohort study
- 2017
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Ingår i: PLOS ONE. - : PUBLIC LIBRARY SCIENCE. - 1932-6203. ; 12:5
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Tidskriftsartikel (refereegranskat)abstract
- Osteogenesis imperfecta (OI) is a heterogeneous group of disorders of connective tissue, caused mainly by mutations in the collagen I genes (COL1A1 and COL1A2). Dentinogenesis imperfecta (DGI) and other dental aberrations are common features of OI. We investigated the association between collagen I mutations and DGI, taurodontism, and retention of permanent second molars in a retrospective cohort of 152 unrelated children and adolescents with OI. The clinical examination included radiographic evaluations. Teeth from 81 individuals were available for histopathological evaluation. COL1A1/2 mutations were found in 104 individuals by nucleotide sequencing. DGI was diagnosed clinically and radiographically in 29% of the individuals (44/152) and through isolated histological findings in another 19% (29/152). In the individuals with a COL1A1 mutation, 70% (7/10) of those with a glycine substitution located C-terminal of p. Gly305 exhibited DGI in both dentitions while no individual (0/7) with a mutation N-terminal of this point exhibited DGI in either dentition (p = 0.01). In the individuals with a COL1A2 mutation, 80% (8/10) of those with a glycine substitution located C terminal of p. Gly211 exhibited DGI in both dentitions while no individual (0/5) with a mutation N-terminal of this point (p = 0.007) exhibited DGI in either dentition. DGI was restricted to the deciduous dentition in 20 individuals. Seventeen had missense mutations where glycine to serine was the most prevalent substitution (53%). Taurodontism occurred in 18% and retention of permanent second molars in 31% of the adolescents. Dental aberrations are strongly associated with qualitatively changed collagen I. The varying expressivity of DGI is related to the location of the collagen I mutation. Genotype information may be helpful in identifying individuals with OI who have an increased risk of dental aberrations.
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| 21. |
- Andersson, Lars Gustaf, et al.
(författare)
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Dr. Bergman's Cabinet
- 2006
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Ingår i: Bergman Horror Show. - 9197385298 ; , s. 6-15
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Bokkapitel (populärvet., debatt m.m.)abstract
- Essay on the horror theme in the films of Ingmar Bergman.
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| 22. |
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| 23. |
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| 24. |
- Andersson, Ola, et al.
(författare)
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Effect of Delayed Cord Clamping on Neurodevelopment at 4 Years of Age : A Randomized Clinical Trial
- 2015
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Ingår i: JAMA pediatrics. - : American Medical Association (AMA). - 2168-6203 .- 2168-6211. ; 169:7, s. 631-638
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Tidskriftsartikel (refereegranskat)abstract
- IMPORTANCE Prevention of iron deficiency in infancy may promote neurodevelopment. Delayuci umbilical cord clamping (CC) prevents iron deficiency at 4 to 6 months of age, but long-term effects after 12 months of age have not been reported. OBJECTIVE To investigate the effects of delayed CC compared with early CC on neurodevelopment at 4 years of age. DESIGN, SETTING, AND PARTICIPANTS Follow-up of a randomized clinical trial conducted from April 16, 2008, through May 21, 2010, at a Swedish county hospital. Children who were included in the original study (n = 382) as full-term infants born after a low-risk pregnancy were invited to return for follow-up at 4 years of age. Wechsler Preschool and Primary Scale of Intelligence (WPPSI-111) and Movement Assessment Battery for Children (Movement ABC) scores (collected between April 18, 2012, and July 5, 2013) were assessed by a blinded psychologist. Between April 11, 2012, and August 13, 2013, parents recorded their child's development using the Ages and Stages Questionnaire, Third Edition (ASQ) and behavior using the Strengths and Difficulties Questionnaire. All data were analyzed by intention to treat. INTERVENTIONS Randomization to delayed CC (>= 180 seconds after delivery) or early CC (<= 10 seconds after delivery). MAIN OUTCOMES AND MEASURES The main outcome was full-scale IQ as assessed by the were development as assessed by the scales from the WPPSI-III and Movement ABC, development as recorded using the ASQ, and behavior using the Strengths and Difficulties Questionnaire. RESULTS We assessed 263 children (68.8%). No differences were found in WPPSI-III scores between groups. Delayed CC improved the adjusted mean differences (AMDs) in the ASQ personal-social (AMD, 2.8; 95% Cl, 0.8-4.7) and fine-motor (AMD, 2.1; 95% Cl, 0.2-4.0) domains and the Strengths and Difficulties Questionnaire prosocial subscale (AMD, 0.5; 95% Cl, >0.0-0.9). Fewer children in the delayed-CC group had results below the cutoff in the ASQ fine-motor domain (11.0% vs 3.7%; P =.02) and the Movement ABC bicycle-trail task (12.9% vs 3.8%; P =.02). Boys who received delayed CC had significantly higher AMDs in the WPPSI-III processing-speed quotient (AMD, 4.2; 95% Cl, 0.8-7.6; P =.02), Movement ABC bicycle-trail task (AMD, 0.8; 95% Cl, 0.1-1.5; P =.03), and fine-motor (AMD, 4.7; 95% Cl, 1.0-8.4; P =.01) and personal-social (AMD, 4.9; 95% Cl, 1.6-8.3; P =.004) domains of the ASQ. CONCLUSIONS AND RELEVANCE Delayed CC compared with early CC improved scores in the fine-motor at 4 years of age, especially in boys, indicating that optimizing the time to CC may affect neurodevelopment in a low-risk population of children born in a high-income country.
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| 25. |
- Andersson, Per Ola, et al.
(författare)
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Polymorph and size dependent uptake and toxicity of TiO2 nanoparticles in living lung epithelial cells
- 2011
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Ingår i: Small. - : Wiley. - 1613-6810 .- 1613-6829. ; 7:4, s. 514-523
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Tidskriftsartikel (refereegranskat)abstract
- The cellular uptake and distribution of five types of well-characterized anatase and rutile TiO(2) nanoparticles (NPs) in A549 lung epithelial cells is reported. Static light scattering (SLS), in-vitro Raman microspectroscopy (mu-Raman) and transmission electron spectroscopy (TEM) reveal an intimate correlation between the intrinsic physicochemical properties of the NPs, particle agglomeration, and cellular NP uptake. It is shown that mu-Raman facilitates chemical-, polymorph-, and size-specific discrimination of endosomal-particle cell uptake and the retention of particles in the vicinity of organelles, including the cell nucleus, which quantitatively correlates with TEM and SLS data. Depth-profiling mu-Raman coupled with hyperspectral data analysis confirms the location of the NPs in the cells and shows that the NPs induce modifications of the biological matrix. NP uptake is found to be kinetically activated and strongly dependent on the hard agglomeration size-not the primary particle size-which quantitatively agrees with the measured intracellular oxidative stress. Pro-inflammatory responses are also found to be sensitive to primary particle size.
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| 26. |
- Andersson, Susann, 1965, et al.
(författare)
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Vision in children with hydrocephalus.
- 2006
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Ingår i: Developmental medicine and child neurology. - 0012-1622. ; 48:10, s. 836-41
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Hydrocephalus in children has many aetiologies, and can cause multiple ophthalmic and visual disorders. This study sets out to detect and quantify visual and visuoperceptual dysfunction in children who have received surgical treatment for hydrocephalus with and without myelomeningocele, and to relate the results to the associated diagnoses and results from a comparison group. Seventy-five school-aged children (41 males, 34 females) with surgically-treated hydrocephalus and 140 comparison children (76 males, 64 females) matched for age and sex underwent comprehensive ophthalmologic examination. Median age at examination was 9 years and 4 months (range 7 y 4 mo-12 y 10 mo). Visual function deficits were identified in 83% (62/75) of the children with hydrocephalus. Visual impairment (binocular visual acuity <0.3) was found in 15% (11/73; comparison group 0%) but in none with myelomeningocele. Strabismus was found in 69% (51/74; comparison group 4% [5/140], p < 0.001), and refractive errors were found in 67% (47/70; comparison group 20% [28/140], p < 0.001). Cognitive visual dysfunction was identified in 59% (38/64; comparison group 3% [4/140], p < 0.001). These disorders were identified in various combinations and comprised impaired ability to plan movement through depth (e.g. going down a stair), impaired simultaneous perception, impaired perception of movement, impaired orientation, and (least frequently) impaired recognition. In this study, children with hydrocephalus associated with myelomeningocele were least commonly affected. Visual disorders were most frequent in those with epilepsy, cerebral palsy, and/or cognitive disability.
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| 27. |
- Andersson, Torbjörn, et al.
(författare)
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Effects of Interferon on Tumor Tissue Content in Liver Metastases of Human Carcinoid Tumors
- 1990
-
Ingår i: Cancer Research. - 0008-5472 .- 1538-7445. ; :50, s. 3413-3415
-
Tidskriftsartikel (refereegranskat)abstract
- In 21 patients ultrasound-guided cutting biopsies, from carcinoid metastases of the liver, were taken before and after therapy with α-interferon. Each biopsy was examined under light microscopy and the amount of tumor tissue and connective tissue was quantified and then correlated to objective response to interferon therapy. A significant reduction of the amount of tumor tissue, in spite of unaltered metastatic size and a corresponding increase in connective tissue, was seen after interferon therapy. A more pronounced reduction of tumor tissue occurred after long-term interferon therapy. A positive correlation between objective therapy response and tumor tissue reduction was also present. Patients responding poorly, or not at all, to therapy did not show any significant decrease in tumor tissue. Since treatment with immune response modifiers is expected to increase in the near future, it is important to choose the right investigations for therapy monitoring, and since all patients in this investigation had unchanged tumor size on repeated radiological examinations, it is obvious that microscopic examination of core biopsies is a better method for evaluating effects of long-term therapy than tumor size measurement with radiological techniques. Further, the results may indicate that interferon exerts a cytotoxic effect on carcinoid tumor cells in vivo.
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| 28. |
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| 29. |
- Arvidsson, Barbro, 1945-, et al.
(författare)
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A nurse-led rheumatology clinic’s impact on empowering patients with rheumatoid arthritis : A qualitative study
- 2006
-
Ingår i: Nursing and Health Sciences. - Richmond, Australia : Wiley-Blackwell. - 1441-0745 .- 1442-2018. ; 8:133-9
-
Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to describe a nurse-led rheumatology clinic’s impact on empowering patients with rheumatoid arthritis (RA). Rheumatoid arthritis is a chronic, inflammatory disease that attacks many joints, causing considerable functional restrictions for patients. Consequently, these patients are dependent on a wide variety of health-care services. A descriptive, qualitative design inspired by phenomenography was chosen. The conceptions were collected through interviews with 16 strategically selected patients with RA. Three descriptive categories comprising eight conceptions emerged: teaching (gaining insight and receiving information), regular review (receiving security, realizing regularity, and achieving accessibility), and attention (getting a holistic assessment, receiving coordinated care, and getting sufficient time). A nurse-led rheumatology clinic can be a source for empowering patients with RA to adopt new stances to alternative actions and achieve a higher level of faith in their own abilities.
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| 30. |
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| 31. |
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| 32. |
- Berbyuk Lindström, Nataliya, 1978, et al.
(författare)
-
Person- and Family-Centeredness in Ethiopian Cancer Care: Improving Communication, Ethics, Decision Making and Health
- 2020
-
Ingår i: JMIR Research Protocols. - : JMIR Publications Inc.. - 1929-0748. ; 9:5
-
Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Cancer is a major burden in Ethiopia. The Oncology Department of Tikur Anbessa (Black Lion) Specialized Hospital (TASH) in Addis Ababa is the country's sole specialist unit for cancer care. With only a handful of oncologists, a lack of resources, and a huge patient load, the work is challenging, especially in terms of achieving effective and ethical patient consultations. Patients, usually accompanied by family members, often wait for a long time to receive medical attention and frequently depart without treatment. Handling consultations effectively is essential in order to help patients as much as possible within such limitations. OBJECTIVE: The project addresses three main aims: (1) to enhance and expand the understanding of communicative and associated ethical challenges in Ethiopian cancer care; (2) to enhance and expand the understanding of the implications and use of person- and family-centered solutions to address such communicative challenges in practice, and (3) to plan and evaluate interventions in this area. METHODS: This project develops and consolidates a research collaboration to better understand and mitigate the communicative challenges in Ethiopian cancer care, with a focus on the handling and sharing of decision making, and ethical tensions between patients, staff, and family. Using theoretical models from linguistics, health communication, and health care ethics, multiple sources of data will be analyzed. Data sources currently include semi-structured interviews with the Ethiopian staff, patients, and family caregivers (91), survey data on cancer awareness (150) and attitudes to breaking bad news (450), and video-recordings of medical consultations (45). In addition, we will also develop clinical and methodological solutions to formulate educational interventions. RESULTS: The project was awarded funding by the Swedish Research Council in December 2017 for the period 2018-2021. The research ethics board in Sweden and in Ethiopia approved the conduct of the project in May 2018. The results from the studies will be published in 2020 and 2021. CONCLUSIONS: The project is a first step towards producing unique and seminal knowledge for the specific context of Ethiopia in the area of physician-patient communication research and ethics. It contributes to an understanding of the complexity around the role of family and ethical challenges in relation to patient involvement and decision making in Ethiopia. Improved knowledge in this area can provide a fundamental model for ways to improve cancer care in many other low resource settings in Africa and the Middle East, which share central cultural prerequisites (such as a strong patriarchal family structure, combined with strong and devout religiosity). The project will also serve to develop greater understanding about current challenges in Western health systems associated with greater family and patient participation in decision making. In addition, the project will also contribute to improving the education of Ethiopian health professionals working in cancer care by developing a training program to help them better understand and respond to identified challenges associated with communication.
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| 33. |
- Björck, Lennart, et al.
(författare)
-
Tveksam vinst med ekolantbruk
- 2009
-
Ingår i: Svenska dagbladet. - 1101-2412. ; -
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 34. |
- Brunnström, Åsa, et al.
(författare)
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On the biosynthesis of 15-HETE and eoxin C-4 by human airway epithelial cells
- 2015
-
Ingår i: Prostaglandins & other lipid mediators. - : Elsevier BV. - 1098-8823 .- 2212-196X. ; 121, s. 83-90
-
Tidskriftsartikel (refereegranskat)abstract
- Several lines of evidence indicate that 15-lipoxygenase type 1 (15-LO-1) plays a pathophysiological role in asthma. The aim for this study was to investigate the 15-LO-1 expression and activity in primary human airway epithelial cells cultivated on micro-porous filters at air liquid interface. Incubation of human airway epithelial cells with arachidonic acid led to the formation of 15(S)-hydroxy-eicosatetraenoic acid (15-HETE) and exposing the cells to bacteria or physical injury markedly increased their production of 15-HETE. The cells were also found to convert arachidonic acid to eoxin C-4 (EXC4). Subcellular fractionation revealed that the conversion of EXA(4) to EXC4 was catalyzed by a soluble glutathione transferase (GST). The GST P1-1 enzyme was found to possess the highest activity of the investigated soluble GSTs. Following IL-4 treatment of airway epithelial cells, microarray analysis confirmed high expression of 15-LO-1 and GST P1-1, and immunohistochemical staining of bronchial biopsies revealed co-localization of 15-LO-1 and GST P1-1 in airway epithelial cells. These results indicate that respiratory infection and cell injury may activate the 15-LO pathway in airway epithelial cells. Furthermore, we also demonstrate that airway epithelial cells have the capacity to produce EXC4.
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| 35. |
- Ekstrand-Hammarström, Barbro, et al.
(författare)
-
Human Primary Bronchial Epithelial Cells are more Responsive to Titanium Dioxide Nanoparticles than the Lung Epithelial Cell Lines A549 and BEAS-2B
- 2012
-
Ingår i: Nanotoxicology. - : Informa Healthcare. - 1743-5390 .- 1743-5404. ; 6:6, s. 623-634
-
Tidskriftsartikel (refereegranskat)abstract
- We have compared the cellular uptake and responses of fivepreparations of nanocrystalline titanium dioxide (TiO2) betweennormal human bronchial epithelial (NHBE) cells and epithelialcell lines (A549 and BEAS-2B). The P25 nanoparticles, containingboth anatase and rutile modifications, induced reactive oxygenspecies (ROS) and secretion of the neutrophil chemoattractantIL-8 in all three cell types used. Pure anatase and rutile particlesprovoked differential IL-8 response in A549 and no response inBEAS-2B cells despite similar formation of ROS. The pure TiO2modifications also provoked release of the inflammatorymediators: IL-6, G-CSF and VEGF, in NHBE cells but not in the twocell lines. We conclude that the responsiveness of lung epithelialcells is strongly dependent on both the physicochemicalproperties of TiO2 nanoparticles and the type of responder cells.The differential pro-inflammatory responsiveness of primarylung epithelial cells compared with immortalized cell linesshould be considered in the assessment of adverse reactions toinhaled nanoparticles.
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| 36. |
- Ekstrand-Hammarström, Barbro, et al.
(författare)
-
Human primary bronchial epithelial cells respond differently to titanium dioxide nanoparticles than the lung epithelial cell lines A549 and BEAS-2B
- 2012
-
Ingår i: Nanotoxicology. - : Informa UK Limited. - 1743-5390 .- 1743-5404. ; 6:6, s. 623-634
-
Tidskriftsartikel (refereegranskat)abstract
- We have compared the cellular uptake and responses of five preparations of nanocrystalline titanium dioxide (TiO(2)) between normal human bronchial epithelial (NHBE) cells and epithelial cell lines (A549 and BEAS-2B). The P25 nanoparticles, containing both anatase and rutile modifications, induced reactive oxygen species (ROS) and secretion of the neutrophil chemoattractant IL-8 in all three cell types used. Pure anatase and rutile particles provoked differential IL-8 response in A549 and no response in BEAS-2B cells despite similar formation of ROS. The pure TiO(2) modifications also provoked release of the inflammatory mediators: IL-6, G-CSF and VEGF, in NHBE cells but not in the two cell lines. We conclude that the responsiveness of lung epithelial cells is strongly dependent on both the physicochemical properties of TiO(2) nanoparticles and the type of responder cells. The differential pro-inflammatory responsiveness of primary lung epithelial cells compared with immortalized cell lines should be considered in the assessment of adverse reactions to inhaled nanoparticles.
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| 37. |
- Ekstrand-Hammarström, Barbro, et al.
(författare)
-
Oxidative stress and cytokine expression in respiratory epithelial cells exposed to well-characterized aerosols from Kabul, Afghanistan
- 2013
-
Ingår i: Toxicology in Vitro. - : Elsevier BV. - 0887-2333 .- 1879-3177. ; 27:2, s. 825-833
-
Tidskriftsartikel (refereegranskat)abstract
- In this study aerosol samples collected in an Asian mega-city (Kabul, Afghanistan) were compared to PM samples collected in a European location with traffic (Umea, Sweden) and a reference urban dust material (SRM 1649b). The toxicity of each sample towards normal human bronchial epithelial (NHBE) cells and a human bronchial epithelial cell line (BEAS-2B) was tested along with their ability to induce reactive oxygen species (ROS) formation and inflammatory responses. The extracts' morphology and elemental composition was studied by SEM-EDXRF, and filter samples were analyzed for metals and organic compounds. The PM from Kabul contained a larger fraction of fine particles, 19 times more polyaromatic hydrocarbons (PAH) and 37 times more oxygenated PAH (oxy-PAH) compared to samples from timed. The PM-samples from Kabul and the reference material (SRM 1649b) induced significantly stronger oxidative stress responses than the samples from Umea. Furthermore, samples collected in Kabul induced significantly higher secretion of the cytokines IL-6, IL-8 and GM-CSF while SRM1649b induced a cytokine pattern more similar to samples collected in Umea. Several properties of the particles could potentially explain these differences, including differences in their size distribution and contents of PAH and oxy-PAH, possibly in combination with their relative transition metal contents.
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| 38. |
- Elvin, A, et al.
(författare)
-
Duplex Doppler ultrasound in carcinoid metastases
- 1991
-
Ingår i: European Radiology. - 0938-7994 .- 1432-1084. ; 1:2, s. 108-112
-
Tidskriftsartikel (refereegranskat)abstract
- In a prospective study, the role of duplex Doppler ultrasound in monitoring interferon treatment-related changes in carcinoid metastases was evaluated. The Doppler findings from the tumours were correlated to the clinical and laboratory status of the patients to test the hypothesis that successful treatment results in increased vascular resistance. The patients were divided into 4 groups: untreated (n = 10), progressive disease (n = 17), stable disease (n = 20) and objective response (n = 18). In 7 cases Doppler evaluation was made before and after treatment. No significant difference in Doppler values were found between the groups, and at present duplex Doppler ultrasound does not seem to play a role in the evaluation of tumour therapy in carcinoid patients.
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| 39. |
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| 40. |
- Fassmer, K., et al.
(författare)
-
Middle Ordovician subduction of continental crust in the Scandinavian Caledonides - an example from Tjeliken, Seve Nappe Complex, Sweden.
- 2017
-
Ingår i: Contributions to Mineralogy and Petrology. - : Springer Science and Business Media LLC. - 0010-7999 .- 1432-0967. ; 172
-
Tidskriftsartikel (refereegranskat)abstract
- The Seve Nappe Complex of the Scandinavian Caledonides is thought to be derived from the distal passive margin of Baltica which collided with Laurentia in the Scandian Phase of the Caledonian Orogeny at 430–400 Ma. Parts of the Seve Nappe Complex were affected by pre-Scandian high- and ultrahigh-pressure metamorphism, in a tectonic framework that is still unclear, partly due to uncertainties about the exact timing. Previous age determinations yielded between ~ 505 and ~ 446 Ma, with a general trend of older ages in the North (Norrbotten) than in the South (Jämtland). New age determinations were performed on eclogite and garnet–phengite gneiss at Tjeliken in northern Jämtland. Thermodynamic modelling yielded peak metamorphic conditions of 25–27 kbar/680–760 °C for the garnet–phengite gneiss, similar to published peak metamorphic conditions of the eclogite (25–26 kbar/650–700 °C). Metamorphic rims of zircons from the garnet–phengite gneiss were dated using secondary ion mass spectrometry and yielded a concordia age of 458.9 ± 2.5 Ma. Lu–Hf garnet-whole rock dating yielded 458 ± 1.0 Ma for the eclogite. Garnet in the eclogite shows prograde major-element zoning and concentration of Lu in the cores, indicating that this age is related to garnet growth during pressure increase, i.e. subduction. The identical ages from both rock types, coinciding with published Sm–Nd ages from the eclogite, confirm subduction of the Seve Nappe Complex in Northern Jämtland during the Middle Ordovician in a fast subduction–exhumation cycle.
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| 41. |
- Fick, Jerker, et al.
(författare)
-
A study of the gas-phase ozonolysis of terpenes: the impact of radicals formed during the reaction
- 2002
-
Ingår i: Atmospheric Environment. - 1352-2310 .- 1873-2844. ; 36:20, s. 3299-3308
-
Tidskriftsartikel (refereegranskat)abstract
- The gas-phase ozonolysis of α-pinene, Δ3-carene and limonene was investigated at ppb levels and the impact of the ozone, relative air humidity (RH), and time was studied using experimental design. The amounts of terpene reacted varied in the different settings and were as high as 8.1% for α-pinene, 10.9% forΔ3-carene and 23.4% for limonene. The designs were able to describe almost all the variation in the experimental data and were also successful in predicting omitted values. The results described the effects of time and ozone and also showed that RH did not have a statistically significant effect on the ozonolysis. The results also showed that all three terpenes were affected by an additional oxidation of OH radicals and/or other reactive species. The results from the designs states that this additional oxidation was responsible for 40% of the total amount of α-pinene reacted, 33% of the total amount of Δ3-carene reacted and 41% of the total amount of limonene reacted at the settings 20 ppb terpene, 75 ppb ozone, 20% RH and a reaction time of 213 s. Additional experiments with 2-butanol as OH radical scavenger showed that the reaction with OH radicals was responsible for 37% of the total α-pinene reacted and 39% of the total Δ3-carene reacted at the same settings. The scavenger experiments also showed that there were no significant amounts of OH radicals formed during the ozonolysis of limonene. The results from the designs were also compared to a mathematical model in order to evaluate further the data.
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| 42. |
- Fick, Jerker, 1971-
(författare)
-
Chemical reactions in ventilation systems : Ozonolysis of monoterpenes
- 2003
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Chemicals in indoor air, either emitted from a source or from a reaction, have been suggested to cause ill health in buildings. However, no clear correlations between exposure and health effects have been made. In this thesis we studied the reaction between monoterpenes, a group of biogenic unsaturated C10 hydrocarbons, and ozone. Ozonolysis of monoterpenes was used as model reactions for unsaturated compounds in ambient air. Also the products formed from these reactions have been suggested as important participants in the occurrence of discomfort and ill health in buildings. To enable a reliable and sensitive measurement of ppb-ppt levels of monoterpenes and the formed products in the presence of ozone an evaluation of available scrubber materials was made. Potassium iodide was shown to remove ambient levels of ozone and have a recovery of >95% for all monoterpenes and formed products included in the investigation. Experimental conditions showed to have a large impact on the initial steps of the ozonolysis, and also on the composition of the formed products. We showed that water plays an important and complex role both in the initial stage of ozonolysis of ∆3-carene and in the formation and composition of products from the ozonolysis of ∆-pinene. The use of experimental design facilitated the evaluation of the investigated reactions. We showed that the formation of OH radicals could be studied using multiple linear regression models and that the presence or absence of OH radicals had a profound impact on the formation of many of the formed products. We also made an observation of the lack of formed OH radicals in the ozonolysis of limonene and discussed probable causes of this observation. Despite the short reaction times and the ambient levels of ozone and monoterpenes used in our experiments we showed that a number of oxidation products were formed, and that the reaction rate is significantly increased in a ventilation system. This formation is underestimated by theoretical calculations and leads to high amounts of known irritants in the indoor air. We showed that theoretical calculations underestimate the formation of these oxidation products 3-13 times, depending on ventilation system and monoterpene.
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| 43. |
- Fick, Jerker, et al.
(författare)
-
Effect of OH radicals, relative humidity, and time on the composition of the products formed in the ozonolysis of α-pinene
- 2003
-
Ingår i: Atmospheric Environment. ; 37:29, s. 4087-96
-
Tidskriftsartikel (refereegranskat)abstract
- The gas-phase ozonolysis of α-pinene at ppb levels were studied and the effects of OH radicals formed in the reaction, the relative humidity (RH), and time on the products formed were investigated. Identified products were pinic acid, glyoxal, methyl glyoxal, norpinonic acid and a norpinonic acid isomer, pinonic acid, a C4 dicarbonyl, a C5 dicarbonyl, norpinon aldehyde, and pinon aldehyde. The different parameters effect on the formation of these products were evaluated using experimental design and multivariate modeling. Pinonic acid, norpinonic acid and its isomer, were not detected in the absence of OH radicals. The amounts of pinic acid, norpinon aldehyde, and pinon aldehyde all decreased in the absence of OH radicals. Glyoxal and methyl glyoxal were not affected.The formation of pinonic acid decreased when the RH was increased. The formation of pinic acid, glyoxal, methyl glyoxal, and pinon aldehyde increased with increasing RH, while norpinon aldehyde was not affected. The implications of these observations and additional interaction effects are discussed, and a novel route of the formation of pinic acid is presented.
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| 44. |
- Fick, Jerker, et al.
(författare)
-
Formation of oxidation products in a ventilation system
- 2004
-
Ingår i: Atmospheric Environment. - : Elsevier BV. - 1352-2310. ; 38:35, s. 5895-9
-
Tidskriftsartikel (refereegranskat)abstract
- We have studied the formation of oxidation products from the ozonolysis of a monoterpene (α-pinene) in an authentic ventilation system. We observed ten products, norpinic acid, pinic acid, glyoxal, methyl glyoxal, norpinonic acid, pinonic acid, a C4 dicarbonyl (C4H6O2), a C5 dicarbonyl (C5H8O2), norpinon aldehyde, and pinon aldehyde. Experiments were conducted at a low (2.0 g m−3) and moderate (8 g m−3) humidity levels. All products but C4 dicarbonyl and norpinon aldehyde were detected at the low humidity level, but only glyoxal, methyl glyoxal, C4 dicarbonyl, norpinon aldehyde and pinon aldehyde were detected at a moderate humidity. Experiments were conducted at low ppb levels (75 ppb ozone and 4 and 10 ppb α-pinene) and with a short reaction time (75 s). Experiments showed that 5–6% of the α-pinene reacted, which was approximately 4–5 times more than predicted by theoretical calculations. This discrepancy suggests a significant contribution from heterogeneous reactions. These oxidation products were formed despite low reactant concentrations and a short reaction time, indicating that the formation of oxidation products likely occurs at ambient levels and in real settings.
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| 45. |
- Fick, Jerker, et al.
(författare)
-
Ozone Removal in the Sampling of Parts per Billion Levels of Terpenoid Compounds: An Evaluation of Different Scrubber Materials
- 2001
-
Ingår i: Environmental Science & Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 35:7, s. 1458-62
-
Tidskriftsartikel (refereegranskat)abstract
- Some reactive volatile organic compounds (VOCs) are prone to degradation during sampling in an ozone-rich environment. A wide variety of different chemicals have been used to remove the ozone prior to sampling, but the possibility of interference by such chemicals with the sampled VOCs has not been thoroughly examined. In the present investigation, the retention/degradation of four terpenes (-pinene, -pinene, 3-carene, and limonene) and isoprene together with some of their oxidation products (-pinene oxide, nopinone, 4-acetyl-1-methylcyclohexene (AMCH), methylglyoxal, and methacrolein) has been studied, using various ozone-removing chemicals in an attempt to evaluate their potential as ozone scrubbers in the sampling of ambient air. The chemicals included in this first screening and their ozone-removing capacity are as follows: KI, MnO2, and Na2SO3 removed ozone for more than 24 h when exposed to 73-78 ppb (150-160 g/m3) at a sampling flow rate of 500 mL/min. Silanized poly(1,4-phenylene sulfide) (PFS) removed ozone for 5 h, unsilanized PFS removed ozone for 1 h and 50 min, and Na2S2O3 removed ozone for 20 min. The recovery of the selected compounds with the different scrubbers was >95% for all compounds for KI; >95% for the terpenes oxidation products; >90% for the terpenes and isoprene for PFS; >90% for the terpenes and isoprene for MnO2 on copper nets, Na2SO3, and Na2S2O3; and <90% for the terpenes and isoprene for carulite (a commercial mixture between MnO2, CuO, and Al2O3), CuO, and indigo carmine.
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| 46. |
- Fick, Jerker, et al.
(författare)
-
Ozonolysis of monoterpenes in mechanical ventilation systems
- 2005
-
Ingår i: ATMOSPHERIC ENVIRONMENT. - : Elsevier BV. - 1352-2310. ; 39:34, s. 6315-25
-
Tidskriftsartikel (refereegranskat)abstract
- In this investigation the ozonolysis of of three monoterpenes (alpha-pinene, Delta(3)-carene and limonene) was studied was studied in authentic mechanical ventilation systems, that included either a cross flow or a rotary heat exchanger. The effects of varying three experimental parameters were investigated: the level of ozone (25 and 75 ppb), the reaction time (25 and 75s), and the surface area in the ventilation duct (14.8 and 29.5 m(2)). The initial concentration of each of the monoterpenes was 20 ppb in every experiment, and 1-16% of the alpha-pinene, < 0.5-13% of the Delta(3)-carene, and < 0.5-16% of the limonene reacted. The effects of humidity (g m(-3)) and temperature of the outdoor and supply air, and water losses in the ventilation duct, were also evaluated. Experiments were based on a chemometric statistical design. Comparison of the results to theoretically calculated values showed that theoretical calculations underestimated the amounts that reacted in the ventilation systems by factors of 2-13, depending on the monoterpene and experimental settings.
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| 47. |
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| 48. |
- Fjällström, Per, et al.
(författare)
-
Drying of linseed oil paints : the effects of substrate on the emission of aldehydes
- 2003
-
Ingår i: Indoor Air. - : Hindawi Limited. - 0905-6947. ; 13:3, s. 277–82-
-
Tidskriftsartikel (refereegranskat)abstract
- The effect of substrate on the emission of aldehydes from linseed oil paint was investigated. Plates of glass, fiberboard, gypsum board, lime mortar and wood lath were painted, and then placed into emission chambers. Samples were collected every eighth hour over 10 days with 2,4-dinitrophenylhydrazin samplers. Analysis was performed with liquid chromatography/UV-detection and mass spectrometry. Paint applied on gypsum board gave the highest total amount of emitted carbonyls, and that on wood lath gave the least. Painted glass had the highest contribution of unsaturated species, and lime mortar, the lowest. Lime mortar also had the highest momentary levels of a single species, 443 nmol/h/m2 of propanal, while fiberboard peaked at only 123 nmol/h/m2 of propanal. In turn, the emission from the painted fiberboard had the slowest decline, and thus at the end of the experiment the highest levels. All substrates gave an emission that peaked within 16 h.
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| 49. |
- Forslin, Barbro M, et al.
(författare)
-
The Health-promotion perspective in public-health plans in a Swedish region over three decades
- 2013
-
Ingår i: Health Promotion International. - : Oxford University Press (OUP). - 0957-4824 .- 1460-2245. ; 28:2, s. 269-280
-
Tidskriftsartikel (refereegranskat)abstract
- The trend away from a health and medical care-based policy to a healthy public policy has taken place in Sweden rather later than in other West European countries. One of the first county councils to establish health-promotion plans was Västernorrland. The aims of this study are to describe the contents of and analyze the changes over time in the five public-health plans in the county. The object of study for the policy analysis consists in these plans between 1978 and 2004. A deductive thematic content analysis was performed for each plan on the basis of the central determinants of health promotion. The positioning of the plans was determined using a theoretical framework (Beattie's modified model) founded in the dimensions of power (individual and collective) and governance (local, i.e. the municipalities, and central, i.e. the county council). The results show that the value attributed to good health was consistently high, but the means for attaining this goal have varied over time. The policy focus of the measures in the plans have taken a cyclical path-from individual empowerment to empowerment from a societal perspective, and back prioritizing of actions at an individual level. On the governance dimension, there has been a corresponding positional change over time-from regional to local and then back to regional. Promoting the health of a population requires mutual interaction between the regional and local levels, in which both societal and individually oriented actions are prioritized.
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| 50. |
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