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Search Results: 1 - 10 of 2786 matches for " Elisabeth Isaksson "
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Cellular Antioxidant Effect of Four Bromophenols from the Red Algae, Vertebrata lanosa
Elisabeth K. Olsen,Espen Hansen,Johan Isaksson,Jeanette H. Andersen
Marine Drugs , 2013, DOI: 10.3390/md11082769
Abstract: Three known bromophenols, 2,3-dibromo-4,5-dihydroxybenzylaldehyde ( 1), 2,2′,3-tribromo-3′,4,4′,5-tetrahydroxy-6′-hydroxymethyldiphenylmethane ( 2) and bis(2, 3-dibromo-4,5-dihydroxylbenzyl) ether ( 3), and one new one, 5,5″-oxybis(methylene)bis (3-bromo-4-(2′,3′-dibromo-4′,5′-dihydroxylbenzyl)benzene-1,2-diol) ( 4), were isolated from an extract of the red alga, Vertebrata lanosa. The antioxidant activity of these four bromophenols was examined using one biochemical and two cellular assays: Oxygen Radical Absorbance Capacity (ORAC), Cellular Antioxidant Activity (CAA) and Cellular Lipid Peroxidation Antioxidant Activity (CLPAA) assays. Compound 2 distinguished itself by showing potent activity, having a better antioxidant effect than luteolin in both the CAA and CLPAA assays and of quercetin in the CLPAA assay. Although several bromophenols are known to be potent antioxidants in biochemical assays, this is the first time their cellular antioxidant activity has been demonstrated.
Thousand years of winter surface air temperature variations in Svalbard and northern Norway reconstructed from ice-core data
Dmitry Divine,Elisabeth Isaksson,Tonu Martma,Harro A.J. Meijer
Polar Research , 2011, DOI: 10.3402/polar.v30i0.7379
Abstract: Two isotopic ice core records from western Svalbard are calibrated to reconstruct more than 1000 years of past winter surface air temperature variations in Longyearbyen, Svalbard, and Vard , northern Norway. Analysis of the derived reconstructions suggests that the climate evolution of the last millennium in these study areas comprises three major sub-periods. The cooling stage in Svalbard (ca. 800–1800) is characterized by a progressive winter cooling of approximately 0.9 °C century 1 (0.3 °C century 1 for Vard ) and a lack of distinct signs of abrupt climate transitions. This makes it difficult to associate the onset of the Little Ice Age in Svalbard with any particular time period. During the 1800s, which according to our results was the coldest century in Svalbard, the winter cooling associated with the Little Ice Age was on the order of 4 °C (1.3 °C for Vard ) compared to the 1900s. The rapid warming that commenced at the beginning of the 20th century was accompanied by a parallel decline in sea-ice extent in the study area. However, both the reconstructed winter temperatures as well as indirect indicators of summer temperatures suggest the Medieval period before the 1200s was at least as warm as at the end of the 1990s in Svalbard.
Ultrasound and Color Doppler-Guided Surgery for Insertional Achilles Tendinopathy-Results of a Pilot Study  [PDF]
H?kan Alfredson, Martin Isaksson
Open Journal of Orthopedics (OJO) , 2014, DOI: 10.4236/ojo.2014.41002
Abstract:

Background: Treatment of insertional achilles tendinopathy is known to be difficult. Eccentric calf muscle exercises and extracorporeal shockwave therapy have been proposed as the primary treatments for this condition, but surgery is indicated after failed conservative management. There is no consensus about the most efficient surgical treatment. Objectives: To evaluate a new ultrasound and color Doppler-guided surgical treatment for insertional achilles tendinopathy. Patients and methods: 24 consecutive patients (13 men and 11 women, mean age 47 years) with a long duration of insertional achilles tendon pain (median 18 months) were included in the study. The surgical procedure consisted of extirpation of the subcutaneous and retrocalcaneal bursa, scraping of the ventral distal achilles tendon and removal of prominent bone at the upper calcaneal tuberosity (Haglund’s deformity). In 13 patients, the plantaris tendon was also cut and excised. VAS for pain during activity, satisfaction with the treatment result and the SF-36 score to measure quality of life were used for evaluation. Results: The mean VAS had decreased from 72 before surgery to 19 after surgery (p < 0.001), and 20/24 (83%) patients were satisfied with the result and had returned to full tendon loading activity at the one-year follow-up. The SF-36 score had improved significantly. Conclusion: Ultrasound and color Doppler-guided surgical treatment seems to be a good method for treatment of chronic painful insertional achilles tendinopathy. Longer follow-up studies on larger materials are needed.

20-Year Climatology of and Wet Deposition at Ny-lcurlyb\AArcurlyblesund, Svalbard
Rafael Kühnel,Tjarda J. Roberts,Mats P. Bj rkman,Elisabeth Isaksson,Wenche Aas,Kim Holmén,Johan Str m
Advances in Meteorology , 2011, DOI: 10.1155/2011/406508
Abstract: A 20-year dataset of weekly precipitation observations in Ny-Ålesund, Svalbard, was analysed to assess atmospheric wet deposition of nitrogen. Mean annual total nitrogen deposition was 74 mg N/(m2 yr) but exhibited large interannual variability and was dominated by highly episodic “strong” events, probably caused by rapid transport from European sources. The majority (90%) of precipitation samples were defined as “weak” (<2 mg N/m2) and contributed an annual baseline of ~17 mg N/(m2 yr), whereas 10% of precipitation samples were defined as “strong” (>2 mg N/m2) and additionally contributed up to 225 mg N/(m2 yr). Nitrate deposition largely occurred in samples within the solid-precipitation season (16 September–2 June), and ammonium deposition occurred equally in both solid and liquid seasons. Trends of reactive nitrogen emissions from Europe are uncertain, and increasing cyclonic activity over the North Atlantic caused by a changing climate might lead to more strong deposition events in Svalbard.
20-Year Climatology of and Wet Deposition at Ny-lcurlyb\AArcurlyblesund, Svalbard
Rafael Kühnel,Tjarda J. Roberts,Mats P. Bj?rkman,Elisabeth Isaksson,Wenche Aas,Kim Holmén,Johan Str?m
Advances in Meteorology , 2011, DOI: 10.1155/2011/406508
Abstract: A 20-year dataset of weekly precipitation observations in Ny-?lesund, Svalbard, was analysed to assess atmospheric wet deposition of nitrogen. Mean annual total nitrogen deposition was 74?mg?N/(m2?yr) but exhibited large interannual variability and was dominated by highly episodic “strong” events, probably caused by rapid transport from European sources. The majority (90%) of precipitation samples were defined as “weak” (<2?mg?N/m2) and contributed an annual baseline of ~17?mg?N/(m2?yr), whereas 10% of precipitation samples were defined as “strong” (>2?mg?N/m2) and additionally contributed up to 225?mg?N/(m2?yr). Nitrate deposition largely occurred in samples within the solid-precipitation season (16 September–2 June), and ammonium deposition occurred equally in both solid and liquid seasons. Trends of reactive nitrogen emissions from Europe are uncertain, and increasing cyclonic activity over the North Atlantic caused by a changing climate might lead to more strong deposition events in Svalbard. 1. Introduction Human activities release reactive nitrogen such as NH3 and (NO + NO2) to the atmosphere through energy production, fertilizer production, and cultivation of crops [1–4]. The resulting nitrogen-enriched air masses can be transported into remote, nutrient-limited regions such as the Arctic [5], primarily in the form of PAN (peroxyacetyl nitrate), but also as nitrate and ammonium aerosol. Furthermore, deposition of reactive nitrogen through precipitation is considered to be the main pathway for transfer of atmospheric nitrogen to the high Arctic surface [6]. The deposition of reactive nitrogen in the Arctic therefore results from the complex interplay of emissions, atmospheric transport, chemistry, precipitation, and snowpack processes as described below. Ice core analyses from Svalbard [7] and Greenland [8] showed an increase in nitrate concentrations in the 1950’s, followed by a drop in the 1980’s in the Svalbard ice cores. A trend analysis of recent precipitation observations in Europe could not find any significant trends for nitrate in Ny-?lesund [9, 10]. In Europe and North America, the nitrogen emissions are expected to further decrease due to current and future legislations though there are regional differences which may affect the Arctic in particular. The expected intensification of shipping activity might lead to an increase of nitrogen emissions in the Arctic [4]. Reduction protocols and improvements in technology counteract the increase of nitrogen emissions, and some progress has been made in reducing emissions in the last decade [11,
Bibliometric Evaluation of the Changing Finnish Astronomy
Eva Isaksson
Physics , 2010,
Abstract: This is a follow-up on the bibliometric evaluation of Finnish astronomy presented by the author at the LISA V conference in 2006. The data from the previous study are revisited to determine how a wider institutional base and mergers affect comparisons between research units.
E-accessible Astronomy Resources
Eva Isaksson
Physics , 2010,
Abstract: Making online resources more accessible to physically challenged library users is a topic deserving informed attention from astronomy librarians. Recommendations like WCAG 2.0 standards and section 508, in the United States, have proven valuable, and some vendors are already making their products compliant with them. But what about the wide variety of databases and other resources produced by astronomy information professionals themselves? Few, if any, of these are currently compliant with accessibility standards. Here we discuss some solutions to these accessibility challenges.
Performance of the ATLAS tau trigger during 2011 data taking period
Charlie Isaksson
Physics , 2011,
Abstract: Many models for physics Beyond the Standard Model predict an increased production rate of tau leptons. Therefore hadronically decaying tau leptons play an important role in searches for new physics at the LHC. By triggering on them, the discovery power of ATLAS can be greatly enhanced for many Beyond the Standard Model searches. In this contribution we present a brief description of the ATLAS tau trigger system and demonstrate its robustness and reliability during 2011.
Early retirement: positive or negative for well being?
Isaksson,Kerstin; Johansson,Gunn;
Revista de Psicología del Trabajo y de las Organizaciones , 2008, DOI: 10.4321/S1576-59622008000300002
Abstract: is the transition from work to early retirement generally a cause for distress? this question has been addressed in several research studies over many decades. it was also the focus of a longitudinal study of individuals of 55 years and older who retired as part of a downsizing program in a swedish insurance company. the consequences in terms of health and well being during the first two post-retirement years were evaluated using two different approaches to data analysis. this paper brings together results from two different reports (isaksson, 1997; isaksson and johansson, 2000) aiming to provide a concluding picture and to relate to recent research. using longitudinal questionnaire data, the study compared early retirees and persons continuing to work over the years following downsizing. the effects of voluntary/forced choice, employment status and gender on the subsequent adaptation of older individuals were evaluated. the results revealed no signs of a general retirement crisis. more importantly, voluntary (as opposed to a forced choice) choice of employment or retirement was directly and positively associated with satisfaction and psychological well being for both groups. women showed lower values of work centrality, appeared to be more inclined to apply for retirement and were generally more satisfied with the outcome than men. health problems were significantly lower 1.5 years after retirement but no similar effect was found among stayers. furthermore, an attempt was made to identify patterns of adjustment to early retirement by means of cluster analysis. four stable patterns were described: continuous working, positive adaptation to retirement, one small group with signs of high distress and finally a group with improved health at t2.
A Preliminary Model for Assessing University Sustainability from the Student Perspective
Raine Isaksson,Mikael Johnson
Sustainability , 2013, DOI: 10.3390/su5093690
Abstract: This paper assesses university sustainability from the perspective of the interested student. A set of questions for a university website analysis is proposed and preliminary results for Swedish universities are presented. The university website analysis intends to emulate a student looking for a university working with sustainable development. University ranking is compared with the results from the sustainability assessment. Results from the study are based on university website analysis of 18 Swedish universities out of a total of 30. Universities are grouped in high ranked, low ranked and benchmark universities. For the majority of the studied universities it was possible to extract the information needed for a sustainability assessment from the website, which indicates that further development of the method is of interest. The average level of performance in the assessment was found to be less than 50% of the maximum of the proposed scale. With Sweden generally being a leading nation in sustainable development the results are below of what could be expected. Ranking, based on the Swedish ranking system does not seem to predict university sustainability performance. The indication is that Gothenburg University, while having further improvement potential, could be considered a benchmark in the Swedish context.
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