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- Sun, L C, et al.
(författare)
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Binuclear ruthenium-manganese complexes as simple artificial models for photosystem II in green plants
- 1997
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Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 1520-5126 .- 0002-7863. ; 119:30, s. 6996-7004
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Tidskriftsartikel (refereegranskat)abstract
- As part of a project aimed at developing models for photosystem II (PSII) in green plants, we have prepared a series of model compounds (7, 8, and 13). In these compounds, a photosensitizer, ruthenium(II) tris(bipyridyl) complex (to mimic the function of P-680 in PSII), was covalently linked to a manganese(II) ion through different bridging ligands. The structures of the compounds were characterized by electron paramagnetic resonance measurements and electrospray ionization mass spectrometry. The interaction between the ruthenium and manganese moieties within the complex was probed by steady-state and time-resolved emission measurements. When the binuclear complexes are exposed to flash photolysis in the presence of an electron acceptor such as methylviologen (MV2+), it could be shown that after the initial electron transfer from the excited state of Ru(II) in compound 7, forming Ru(III) and MV+., an intramolecular electron transfer from coordinated Mn(II) to the photogenerated Ru(III) occurred with a first-order rate constant of 1.8 x 10(5) s(-1), regenerating Ru(II). This is believed to be the first supramolecular system where a manganese complex has been used as an electron donor to a photo-oxidized photosensitizer, Possible extensions to develop the manganese donor, and thus to approach the function of reaction center in PSII, are indicated.
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- Van, den Berg M, et al.
(författare)
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Toxic equivalency factors (TEFs) for PCBs, PCDDs, PCDFs for humans and wildlife
- 1998
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Ingår i: ENVIRONMENTAL HEALTH PERSPECTIVES. - : US DEPT HEALTH HUMAN SERVICES PUBLIC HEALTH SERVICE. ; 106:12, s. 775-792
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Recension (övrigt vetenskapligt/konstnärligt)abstract
- An expert meeting was organized by the World Health Organization (WHO) and held in Stockholm on 15-18 June 1997. The objective of this meeting was to derive consensus toxic equivalency factors (TEFs) for polychlorinated dibenzo-p-dioxins (PCDDs) and diben
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- BURSTROM, B, et al.
(författare)
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Health promotion in schools: policies and practices in Stockholm county, 1990
- 1995
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Ingår i: Scandinavian journal of social medicine. - : SAGE Publications. - 0300-8037. ; 23:1, s. 39-46
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Tidskriftsartikel (refereegranskat)abstract
- A survey was undertaken of the policies and practices concerning organisation and implementation of health education and health promotion in schools in 151 of the total 213 Local Educational Areas (LEAs) in Stockholm county in 1990. Health education was included in the workplan of 49% of the responding LEAs, while 39% of respondents had a local action programme or guidelines for health education. Topic areas taught to all pupils and considered most important included alcohol, drug abuse, smoking, sex education, bullying, nutrition and physical exercise. Most senior level schools (55–83%) had written policies concerning pupils using alcohol, drugs or smoking in school, and 68% of LEAs had restrictions on staff smoking in school. Continuing health education was desired by 87% of the respondents. A written programme/plan regardings health education was identified as an important indicator of interest and commitment in health education and health policy issues by the local school.
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