| 1. |
- Fredriksson, Andreas, et al.
(författare)
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Kinetics of xanthate adsorption on metal sulphides
- 2004
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Ingår i: Konferens i mineralteknik. - : Föreningen Mineralteknisk Forskning / Swedish Mineral Processing Research Association.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 2. |
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| 3. |
- Johansson, Allan, et al.
(författare)
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Two-color pump-probe experiments in helium using high-order harmonics
- 2003
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Ingår i: European Physical Journal D. Atomic, Molecular, Optical and Plasma Physics. - : Springer Science and Business Media LLC. - 1434-6060 .- 1434-6079. ; 22:1, s. 3-11
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Tidskriftsartikel (refereegranskat)abstract
- A pump-probe technique has been applied for measuring the lifetimes and absolute photoionization cross-sections of excited He states. The 1s2p P-1 and 1s3p P-1 states of He are excited by using the 13th and the 14th harmonic, respectively, of a tunable 70 ps dye laser generated in a Kr gas jet. The states are ionized after a varying time delay, by absorption of probe photons with energies between 1.6 and 4.5 eV. Lifetimes of tau(1s2p) = 0.57 ns and tau(1s3p) = 1.76 ns are determined with a precision of about 15%. A significant enhancement of the number of ions present in the lifetime curves at zero time delay for pressures above 6 x 10(-5) mbar is attributed to direct two-photon ionization of He in combination with AC Stark broadening of the excited state and absorption of the XUV light in the medium. Absolute photoionization cross-sections from the He 1s2p P-1 and He 1s3p P-1 states in the threshold region are determined by measuring the saturation of the ionization process with a precision of similar to 25%. In addition, the variation of the relative orientation between the polarization vectors of the pump and probe beams enables the determination of partial photoionization cross-sections.
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| 4. |
- Kjell, Jonas, et al.
(författare)
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Protein complexes of the plant plasma membrane resolved by Blue Native PAGE
- 2004
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Ingår i: Physiologia Plantarum. - : Wiley. - 0031-9317 .- 1399-3054. ; 121:4, s. 546-555
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Tidskriftsartikel (refereegranskat)abstract
- With the characterization of the total genomes of Arabidopsis thaliana and Oryza sativa, several putative plasma membrane components have been identified. However, a lack of knowledge at the protein level, especially for hydrophobic proteins, have hampered analyses of physiological changes. To address whether protein complexes may be present in the native membrane, we subjected plasma membranes isolated from Spinacia oleracea leaves to blue-native polyacrylamide gel electrophoresis (BN-PAGE). BN-PAGE is well established in the separation of functional membrane protein complexes from mitochondria and chloroplasts, but a resolved protein complex pattern from PM of eukaryotic cells has previously not been reported. Using this method, protein complexes from Spinacia oleracea PM could be efficiently solubilized and separated, including the highly hydrophobic aquaporin (apparent molecular mass 230 kDa), a putative tetramer of H+-ATPase, and several less abundant complexes with apparent masses around or above 750 kDa. After denaturation and separation of the complexes into their subunits in a second dimension (SDS-PAGE), several of the complexes were identified as hydrophobic membrane proteins. Large amounts of protein (up to 1 mg) can be resolved in each lane, which suggests that the method could be used to study also low-abundance protein complexes, e.g. under different physiological conditions.
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| 5. |
- Larsson, Allan, et al.
(författare)
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Technology and Policy for Sustainable Development
- 2002
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Executive Summary 1. The mandate given by the European Council (Chapter 1). At the European Council in Göteborg in June 2001 a strategy for sustainable development was agreed, completing the Union’s political commitment to economic and social renewal by adding a third, environmental dimension to the Lisbon strategy and establishing a new approach to policy making. The European Council stated that clear and stable objectives for sustainable development will present significant economic opportunities. This “has the potential to unleash a new wave of technological innovation and investment, generating growth and employment”. The European Council invited industry to take part in the development and wider use of new environmental technologies in sectors such as energy and transport and in this way decouple economic growth from pressure on natural resources. The Commission committed itself to present to the Spring European Council 2002 a report assessing how environment technology can promote growth and employment. This report, assessing how technology for sustainable development can promote growth and employment, is one contribution to the follow up by the Commission of the mandate from Göteborg European Council. 2. The role of technology for investment, growth and employment (Chapter 2). The report takes the broad view of Agenda 21 on technology as a starting point. The integration of environment policy into a strategy for sustainable development and the broadening of the measures from regulations to more of market based instruments, leads by necessity to a situation where more and more of the technologies will be regarded as mainstream technologies, rather than regulation-driven eco-technologies. As a consequence of this choice of a broad definition of technology the report has the title “Technology and Policy for Sustainable Development”. The report confirms and elaborates on the main message from the Göteborg European Council that new technology offers a strong growth dividend, through investment in which new technologies are embedded. To attain a GDP growth rate of 3 per cent per year – in line with the Lisbon strategy - a rate of investment growth of about 4 to 6 per cent over several years seems necessary, which represents a significant acceleration from the 2 per cent average over the 1990s in the euro area. A higher rate of investment will create room for a faster replacement of old technologies. In addition, a strategy for sustainable development – including policies “to get prices right” – will make the introduction of new technologies more profitable and contribute to stimulate investment. Consequently, the EU strategy for sustainable development can both build on the macroeconomic efforts to stimulate investment and give a strong contribution to such an investment strategy. 3. The potential of new technologies for sustainable development (Chapter 3). Technology is a double-edged sword. It is both a cause of many environmental problems and a key to solving them. It is a matter of fact that the technologies of the past, still dominating in transport, energy, industry and agriculture, are undermining our basic life supporting systems – clean water, fresh air and fertile soil. However, in each of these sectors there are new technologies available or emerging, that may, if widely used, essentially solve the 4 environmental problems. Thus, new technologies have the potential to contribute to a decoupling of economic growth from pressure on natural resources. The fact is that we face a choice between technological change at historically unprecedented rates or a change in atmospheric composition unlike any experienced since the dawn of humanity. During the 1990s we have seen a substantial diffusion of renewable energy and transport technologies and further progress in industry and agriculture technology, not least biotechnology. The most promising for immediate investment is energy saving technologies in housing and the tertiary sector. A systematic introduction of best available technology could reduce the use of energy with 20-50 per cent. New technologies for waste management offers a great potential; the most recent investment in this sector shows a utilisation of more than 90 per cent of the energy content of waste. Even more fundamental are new technologies for “up-stream” resource management in industry, offering strong synergies for productivity in production, quality in goods and services and efficiency in the use of natural resources. In this way a dematerialisation can be brought about in a larger scale. In agriculture organic farming is increasing with 20 per cent a year, in spite of subsidies to traditional, nonsustainable farming methods. Yet, in other cases the growth is not self-sustained. There are still significant obstacles to be overcome to reach the stage where the diffusion of renewable energy technologies is independent of government interventions and where these technologies have made a major inroad into the energy market. The extent to which more efficient technologies will be adopted by the market depends largely on the relative future price relations between different sources of energy, government policies to benchmark or to set standards for eco efficiency and voluntary commitments by industries. It is also of vital importance to consider consumer’s preferences for eco efficient products as well as consumer protection. 4. EU policies of importance for new technology for sustainability (Chapter 4). The European policy initiatives in the main policy areas are discussed in Chapter 4. Such policies can – if forcefully implemented by the Member States – have a strong effect on the demand for new technology in general and could give a strong push for investment. Of fundamental importance is the recommendation in the Broad Economic Policy Guidelines on a gradual but steady and credible change in the level and structure of tax rates until external costs are fully reflected in prices, to cope with the most fundamental structural problem in all developed countries, the unsustainable patters of production and consumption. There is a substantial scope for a rebalancing of prices, particularly on energy markets in favour of renewable energy sources and technologies by using both taxes and other market instruments. The implementation of the European Climate Change Programme (ECCP) and the directive establishing an EU framework for emissions trading will act as a strong driving force towards more sustainable price relations. The setting of good environment standards to prevent the worst cases and measures to stimulate best practice, Integrated Product Policy (IPP), for the whole EU area will have a similar stimulating effect on investment in new technology. The European Single Market is the biggest market in the world for technology, and will become even more important through enlargement. The practices developed in this market will become global standards for all enterprises that wish to compete on this market. Thus, the integration of sustainable development in all policies, not least in research and development, can make the EU the 5 leading global actor in the renewal of products and processes, unleashing a new wave of technological innovation and investment, generating growth and employment. This makes the Member States’ sustainable development strategies, and a decisive implementation of these strategies, a matter of fundamental importance for growth and employment in the whole Community. 5. Enlargement and technology for sustainable development (Chapter 5). The review of the situation in the candidate countries highlights the role of technology and investment as key to the EU strategy for sustainable development. Enlargement of the EU will create strong incentives for the candidate countries to speed up the modernisation process, phasing out old investment and technologies from the command and control period and phasing in the most recent technologies. The energy sector is the most prominent example, where the candidate countries need to increase their capacity substantially and, at the same time, replace old outdated plants with new eco-efficient technologies. 6. Policy conclusions (Chapter 6) The integration of environment in the Lisbon strategy and the emphasis on new technology for sustainable development, agreed by the Göteborg European Council, will make the policies of each of the three pillars of the strategy mutually supportive: • To attain a GDP growth rate of 3 per cent a year and to bring about a decoupling of economic growth from pressure on natural resources, a rate of investment growth of about 4 to 6 per cent seems necessary, increasing the investment share of GDP from around 20 per cent to 24-25 per cent. • This higher rate of investment should be utilised to phase out old technology and phase in new technology, contributing to productivity, quality and eco-efficiency for health, prosperity and environment; to achieve these objective a forceful implementation of a strategy to “get prices right” is necessary to make the value of natural resources and eco-systems visible to the agents in the economy • Economic growth and investment should be utilised to create more and better jobs and be made sustainable by policies, that facilitate participation in working life (see Guidelines for Member States Employment Policy 2002); in this way the EU should reach the employment rate of 70 per cent, agreed in the Lisbon strategy, making Member States’ social protection systems, in particular their pension systems, more sustainable.
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| 6. |
- Lidström-Larsson, Margareta, et al.
(författare)
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Direct observation of a self-assembled monolayer of heptyl xanthate at the germanium/water interface : a polarized FTIR study
- 2004
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Ingår i: Journal of Colloid and Interface Science. - : Elsevier BV. - 0021-9797 .- 1095-7103. ; 273:2, s. 345-349
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Tidskriftsartikel (refereegranskat)abstract
- The adsorption of heptyl xanthate on germanium has been studied by the attenuated total reflection (ATR) technique. Polarized infrared light was used in situ to determine the average orientation of the alkyl chain in heptyl xanthate adsorbed at the germanium/solution interface. Spectra reveal the formation of closely packed xanthate ions with the alkyl chains in the all-trans conformation. The average tilt angle of the alkyl chains of heptyl xanthate was approximately 47° from the surface normal.
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| 7. |
- Lidström-Larsson, Margareta, et al.
(författare)
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Reversible phase transition in Zn₂(O,O-di(cyclohexyl)dithiophosphate)₄, studied by Raman spectroscopy and compared with NMR results
- 2004
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Ingår i: Vibrational Spectroscopy. - : Elsevier BV. - 0924-2031 .- 1873-3697. ; 34:2, s. 243-246
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Tidskriftsartikel (refereegranskat)abstract
- It was recently shown by solid state ³¹P NMR spectroscopy that the number of phosphorous signals from the complex Zn₂(O,O-di(cyclohexyl)DTP)₄ varied reversibly with the temperature. According to the present study, Raman spectra of the same metal complex were also temperature dependent. Spectral features affected by the temperature changed reversibly upon raising and lowering the temperature. It was shown that conformational change of the hexyl rings and the P---O---C entities occurred in the temperature range between 40 and 55°C.
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| 8. |
- Lidström-Larsson, Margareta, et al.
(författare)
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Structure and orientation of collectors adsorbed at the ZnS/water interface
- 2001
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Ingår i: Journal of Colloid and Interface Science. - : Elsevier BV. - 0021-9797 .- 1095-7103. ; 242:1, s. 25-30
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Tidskriftsartikel (refereegranskat)abstract
- The adsorption of O,O-dibutyldithiophosphate and 2-mercaptobenzothiazole on the surface of ZnS has been studied by using the attenuated total reflection (ATR) technique. By utilizing polarized infrared radiation, we got qualitative information about the orientation of the adsorbed collectors. The difference between the absorbance of the s-polarized light and the absorbance of p-polarized light was used to draw conclusions about the orientation. The influence on the orientation of O,O-dibutyldithiophosphate and 2-mercaptobenzothiazole when adsorbing from a mixture of the two collectors is also reported, as well as the influence of these collectors on the hydrophobicity of the ZnS surface obtained by contact angle measurements.
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| 9. |
- Lidström-Larsson, Margareta, et al.
(författare)
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Xanthate adsorbed on ZnS studied by polarized FTIR-ATR spectroscopy
- 2000
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Ingår i: Langmuir. - : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 16:21, s. 8129-8133
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Tidskriftsartikel (refereegranskat)abstract
- The structure and orientation of heptylxanthate adsorbed on a ZnS surface have been studied by the FTIR-ATR technique. By using polarized light and the dichroic ratio, we found the average tilt angle to be approximately 44 degrees. The adsorbed layer studied was prepared by self-assembly from solution or by spraying the solution onto the surfaces of the ATR crystal for a short time and then rinsing with water. From the spectra we can conclude that there is a mixture of adsorbed heptylxanthate and formed diheptyldixanthogen on the ZnS surface. A bridging coordination of the adsorbed heptylxanthate is proposed.
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| 10. |
- Samuelsson, Bo, 1942, et al.
(författare)
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From Here to Sustainability – Is the Lisbon/Göteborg agenda delivering?
- 2004
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Executive Summary The European Councils held in Lisbon (2000) and in Göteborg (2001) gave the Union a new direction by establishing a long term strategy with sustainable development as the overarching objective. Sustainable development means, in this context, goals for economic, social and environmental policy, which are both mutually consistent and capable of delivering enhanced economic growth. To assure progress towards an agreed range of targets, the open method of coordination (OMC) has been adopted as the process for the implementation of the strategy. The strategy for sustainable development is a long-term one and, although the deadline originally set for the Lisbon agenda was 2010, it is clear that sustainable development has a much longer time-horizon and also that there is a global dimension to sustainable development, not just an EU one. In the run up to the mid-term review of the Lisbon strategy, this report by the European Panel for Sustainable Development, EPSD, offers an assessment of the EU approach to sustainable development. The report is based on official documents, research reports and background reports prepared by researchers from different disciplines. It concentrates on the EU-15 Member States, because the ten new members that acceded to the EU in May 2004 have not (yet!) been subject to the same commitments in relation to sustainable development. However, in future work by the EPSD, it is anticipated that the coverage will be extended to embrace all 25 Member States. The report starts with a discussion on the political process, followed by an examination of the economic, social and environmental dimensions of the strategy, of the potential of new technologies, and of the results delivered by the Member States. The final chapters include discussions on impact assessment and the global dimension of sustainable development. The focus of the report is on: − The integration of the three dimensions of sustai nable development and the policies that affect them into one coherent strategy − The implementation of the strategy through the open method of co-ordination The main messages of the report are that it is vital to: • Maintain the original commitment to sustainable development as the overarching objective of the Lisbon strategy and improve the co-ordination between the three pillars of the strategy: the economic, social and environmental dimensions [...]
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