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  • 1
    ISSN: 1573-5028
    Keywords: cyanobacteria ; electron transport ; light regulation ; Synechocystis sp. PCC 6803 ; thioredoxin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The trxA gene encoding one of the different thioredoxins of the facultative heterotrophic cyanobacterium Synechocystis sp. PCC 6803 is transcribed as a single mRNA of 450 nucleotides. Transcript accumulation is similar in all standard growth conditions but strongly decreases after transferring cell cultures from light to darkness. In steady-state conditions, trxA transcription is reduced at high (150–500 μE m−2 s−1) compared with moderate (10–50 μE m−2 s−1) light intensities. The stability of the trxA transcript was similar at different light intensities, and also in darkness. Photosynthetic electron transport inhibitors, as well as glucose starvation in a mutant strain lacking photosystem II, promote a strong decline in the level of trxA transcript. Primer extension analysis suggests that trxA is transcribed from two proximal promoters containing a −10 TATA box similar to the Escherichia coli consensus promoters. Unlike the trxA mRNA, the amount of thioredoxin protein was not reduced in the dark, neither at high light intensities, indicating that thioredoxin protein is very stable. Our results indicate that the thioredoxin encoded by the trxA gene is likely to be primarily regulated at the transcriptional level, rather than at the protein level, by the electron transport generated photosynthetically or from glucose metabolism.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2016-09-29
    Description: Estimating the specific effects of a complete reform of the public transit system of a large city is a difficult task due to the confounding effects that will usually mask the impact of interest. In this study we estimate the impact of the complete reform of the public transport system in Santiago, Chile, named Transantiago, on a specific aspect of interest: particulate matter air pollution levels in the city. Using a regression model with daily panel data from air quality monitoring stations, we conclude that Transantiago reduced the daily average MP10 concentration levels in at least 3.9 μg/m3. This generates health benefits estimated to be close to US$ 200 million a year in our medium scenario, 12% of which correspond to lower public sector health expenditure. If the data for the first year of operation of the system (when it was not yet in steady-state) are excluded the estimated reduction in MP10 levels is even higher. Other effects of Transantiago, positive as well as negative, would need to be estimated in order to obtain a comprehensive evaluation of the reform.
    Keywords: H51 ; L92 ; Q53 ; R41 ; R48 ; ddc:330 ; atmospheric pollution ; public transportation ; public health ; Chile
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: Spanish
    Type: doc-type:article
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  • 3
    Publication Date: 2002-04-25
    Description: This article uses the welfare foundations for the usual net domestic product (NDP) income measure of the traditional National Accounts System (NAS) provided by Weitzman (1976, 2000), and the propositions of Hartwick (1993) and Hamilton (1994a) to correct this measure in order to obtain a green (sustainable) measure of economic income. It estimates green measures of the economic income of Chile's mining sector for the period 1977–1996. Different methodologies regarding the valuation of mining resources are employed, and exploration expenditures in the mining sector are included to empirically estimate the green measures of income. The results clearly show that the usual income measures of the traditional NAS overestimated the economic income generated by the Chilean mining sector during the period by 20–40 per cent, and its rate of growth by 3–20 per cent. Moreover, this overestimation has increased in recent years. These empirical results are remarkably similar when different methodologies are used to calculate green measures of the mining sector's economic income. The empirical evidence produced in this work, together with the one provided by other studies, leads to the conclusion that Chile's outstanding recent economic growth has not delivered the amount of economic income recorded by its NAS, since a significant part of it corresponded to depreciation of the country's natural capital.
    Print ISSN: 1355-770X
    Electronic ISSN: 1469-4395
    Topics: Economics
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  • 4
    Publication Date: 2008-09-01
    Print ISSN: 0921-8009
    Electronic ISSN: 1873-6106
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Economics
    Published by Elsevier
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