Unexpectedly high concentrations of molecular chlorine in coastal air
Article Abstract:
Oxidation reactions control the fate of many atmospheric trace species, such as nitrogen oxide and some volatile organic compounds. Ozone can contribute to the oxidation of atmospheric species, and laboratory investigations have indicated that reactive halogen species could contribute to the oxidative capacity of the lower marine troposphere. Night time observations have been made of molecular chlorine concentrations on the North American coast, during onshore wind flow conditions. It is concluded that a previously unrecognized chlorine source must exist, and that early-morning photolysis of molecular chlorine can yield high concentrations of chlorine atoms.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Ancestral chloroplast genome in Mesostigma viride reveals an early branch of green plant evolution
Article Abstract:
The morphological features of the flagellate Mesostigma viride support the hypothesis that the most ancestral green flagellate was a biflagellated and asymmetric cell with an underlayer of square scales, an eye spot and a cruciate flagellar root system with multilayered structures. This research involved sequencing the whole chloroplast DNA of Mesostigma and undertaking phylogenetic analyses of sequences obtained from this genome. The number of flagella is extremely variable among prasinophytes and other green algae. Multilayered structures, present in chlorophytes and streptophytes, seem to be an ancestral character of algae.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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Photosynthetic control of chloroplast gene expression
Article Abstract:
Redox chemistry is required for energy conversion in respiration and photosynthesis. Two separate light-driven reactions known as photosystem I and photosystem II in the photosynthesis of chloroplasts, are linked by a chain of electron carriers. It is shown that the redox state of plastoquinone can control the transcription rate of genes encoding photosystem I and II reaction-centre apoproteins. This counteracts inefficiencies that occur when either photosystem restricts the rate of the other.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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