ORCID Profile
0000-0001-6230-9626
Current Organisations
University of Ferrara
,
Space Telescope Science Institute
,
University of Cambridge
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Publications
Flv3A facilitates O2 photoreduction and affects H2 photoproduction independently of Flv1A in diazotrophic Anabaena filaments
Publisher: Wiley
Date: 11-10-2022
DOI: 10.1111/NPH.18506
Abstract: The model heterocyst‐forming filamentous cyanobacterium Anabaena sp. PCC 7120 ( Anabaena ) is a typical ex le of a multicellular organism capable of simultaneously performing oxygenic photosynthesis in vegetative cells and O 2 ‐sensitive N 2 ‐fixation inside heterocysts. The flavodiiron proteins have been shown to participate in photoprotection of photosynthesis by driving excess electrons to O 2 (a Mehler‐like reaction). Here, we performed a phenotypic and biophysical characterization of Anabaena mutants impaired in vegetative‐specific Flv1A and Flv3A in order to address their physiological relevance in the bioenergetic processes occurring in diazotrophic Anabaena under variable CO 2 conditions. We demonstrate that both Flv1A and Flv3A are required for proper induction of the Mehler‐like reaction upon a sudden increase in light intensity, which is likely important for the activation of carbon‐concentrating mechanisms and CO 2 fixation. Under ambient CO 2 diazotrophic conditions, Flv3A is responsible for moderate O 2 photoreduction, independently of Flv1A, but only in the presence of Flv2 and Flv4. Strikingly, the lack of Flv3A resulted in strong downregulation of the heterocyst‐specific uptake hydrogenase, which led to enhanced H 2 photoproduction under both oxic and micro‐oxic conditions. These results reveal a novel regulatory network between the Mehler‐like reaction and the diazotrophic metabolism, which is of great interest for future biotechnological applications.
Astro-photometric study of M37 with Gaia and wide-field ugi–imaging
Publisher: Oxford University Press (OUP)
Date: 11-07-2022
Abstract: We present an astrometric and photometric wide-field study of the Galactic open star cluster M37 (NGC 2099). The studied field was observed with ground-based images covering a region of about four square degrees in the Sloan-like filters ugi. We exploited the Gaia catalogue to calibrate the geometric distortion of the large field mosaics, developing software routines that can be also applied to other wide-field instruments. The data are used to identify the hottest white dwarf (WD) member candidates of M37. Thanks to the Gaia EDR3 exquisite astrometry we identified seven such WD candidates, one of which, besides being a high-probability astrometric member, is the putative central star of a planetary nebula. To our knowledge, this is a unique object in an open cluster, and we have obtained follow-up low-resolution spectra that are used for a qualitative characterisation of this young WD. Finally, we publicly release a three-colour atlas and a catalogue of the sources in the field of view, which represents a complement of existing material.
Related Organisations
University Of Cambridge
Location: United Kingdom of Great Britain and Northern Ireland
Related Funding Activities
No related grants have been discovered for Julia Walter.