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| 2. |
- Fälthammar, Carl-Gunne, et al.
(författare)
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Significance of magnetospheric research for progress in astrophysics
- 1978
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Ingår i: Nature. - : Nature Publishing Group. - 0028-0836 .- 1476-4687. ; 275, s. 185-188
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Tidskriftsartikel (refereegranskat)abstract
- Recent in situ measurements have led to a substantial revision of our picture of the magnetosphere and parts of the heliosphere. This concerns the character and distribution of electric fields and currents, the ways in which charged particles are energised, and the chemical composition of the magnetospheric plasma. This revision reflects the fact that real cosmic plasmas behave in fundamentally different ways than predicted by the traditional, idealised models used in magnetospheric physics and in astrophysics. The new understanding of the general properties of cosmic plasma gives us an improved basis on which to interpret astrophysical observations.
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| 3. |
- Holm, Elis, et al.
(författare)
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Global fallout of curium
- 1978
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 273:5660, s. 289-290
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Tidskriftsartikel (refereegranskat)abstract
- THE search for 242mAm (t1/2=152 yr) in environmental samples has involved detection of its daughter 242Cm (t 1/2=163 d) (refs 1-3). These samples were contaminated by transuranium nuclides either from a nuclear fuel reprocessing plant or from a thermonuclear test fallout. A logical consequence was then to analyse global fallout-contaminated samples for 242Cm and 244Cm to establish the present distribution and global contamination of our environment by these transuranium elements. We have chosen the lichen Cladonia alpestris, which is an excellent bioindicator for atmospheric fallout and we present the results here. The samples have been stored in the laboratory for 5-16 yr. Thus, 242mAm and 242Cm were in sequelar radioactive equilibrium. The 242Cm present in the aged samples therefore represents the 242mAm present in the fallout. The results indicate a 242mAm/239+240Pu activity ratio of about 0.003% in global fallout.
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| 5. |
- Larsson, P O, et al.
(författare)
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New Approach to Steroid Conversion Using Immobilised Microorganisms
- 1976
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 263:5580, s. 796-797
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Tidskriftsartikel (refereegranskat)abstract
- The marked increase in demand for contraceptives and anti-inflammatory agents such as cortisol and prednisolone, combined with a diminishing supply of steroid raw materials may lead to shortages of steroid drugs1. Thus it is important to develop new sources for steroids as well as to devise more efficient means for steroid conversions. Here we report a new approach to steroid transformation in which activated immobilised microorganisms are utilised and which represents a promising alternative to conventional microbial transformation processes.
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| 6. |
- Mattiasson, B., et al.
(författare)
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The microbe thermistor
- 1977
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 268, s. 519-520
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Tidskriftsartikel (refereegranskat)abstract
- WE describe here the development of a new analytical configuration, called a microbe thermistor, in which immobilised microorganisms are placed in proximity to a thermistor which measures the metabolic heat evolved by them. Many metabolites can thus be analysed, as we show here by the determination of both single components such as glucose and fructose and of more complex mixtures such as casein. This is in contrast to other analytical applications of immobilised enzymes, for example enzyme electrodes1–3 and enzyme thermistors4–6, which can normally allow analysis of only one compound at a time.
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| 8. |
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| 9. |
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| 10. |
- Perricaudet, Michel, et al.
(författare)
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Structure of two spliced mRNAs from the transforming region of human subgroup C adenoviruses
- 1979
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 281:5733, s. 694-696
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The papova viruses and the human adenoviruses are widely used as a model system to study cell transformation in vitro. In subgroup C human adenoviruses, fragment HpaI-E, which comprises as little as 4.5% of the adenovirus type 5 (ad5) DNA, is sufficient for transformation of rat embryo cells1. Analysis of messenger RNAs (mRNAs) from the transforming region of adenoviruses type 2 (ad2) has identified several spliced mRN A species2−4. Promoter mapping studies indicate that the leftmost early region contains two separate transcription units, E1A and E1B (ref. 5) (Fig. 1a). Region E1A is approximately equivalent HpaI-E. The complete nucleotide sequence of the HpaI-E fragment of ad5 was recently reported6. However, the spliced nature of early adenovirus mRNAs prevents a prediction of the amino acid sequence of the corresponding polypeptides directly from the DNA sequence. To study the structure of early ad2 mRNAs at the nucleotide level, we have used molecular cloning procedures to amplify the appropriate mRNA sequences. In this report, clones corresponding to the 12S and 13S mRNA from region E1A (Fig. 1c) have been isolated and characterised by hybridisation and sequence analysis. Our results enable us to predict the primary sequence of two related polypeptides from region E1A of human subgroup C adenoviruses.
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