A5028312787- Photosynthetic Processes and Mechanisms
- Algal biology and biofuel production
- Spectroscopy and Quantum Chemical Studies
- Photoreceptor and optogenetics research
- Protist diversity and phylogeny
- Antioxidant Activity and Oxidative Stress
- Astronomy and Astrophysical Research
- Marine and coastal ecosystems
- Galaxies: Formation, Evolution, Phenomena
- Microbial Community Ecology and Physiology
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Electrochemical Analysis and Applications
- Mitochondrial Function and Pathology
- Photochemistry and Electron Transfer Studies
- Light effects on plants
- Influenza Virus Research Studies
- Diatoms and Algae Research
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Biocrusts and Microbial Ecology
- COVID-19 epidemiological studies
- Genomics and Phylogenetic Studies
- Metal-Catalyzed Oxygenation Mechanisms
- Viral gastroenteritis research and epidemiology
University of South Bohemia in České Budějovice
2015-2024
Institute of Plant Molecular Biology
2014-2024
Czech Academy of Sciences, Biology Centre
2015-2024
Czech Academy of Sciences
2015-2024
Sewanee: The University of the South
2020-2023
Institute of Parasitology
2020
Institut de Recherche en Astrophysique et Planétologie
2014-2019
Université de Toulouse
2016-2019
Université Toulouse III - Paul Sabatier
2016-2019
Centre National de la Recherche Scientifique
2014-2019
The Fenna–Matthews–Olson (FMO) photosynthetic complex found in green sulfur bacteria has over the last decades been one of favorite "model" systems for biological energy transfer. However, even after 40 years studies, quantitative knowledge about its energy-transfer properties is limited. Here, two-dimensional electronic spectroscopy with full polarization control used to provide an accurate description structure and population dynamics complex. sensitivity technique further allowed us...
We present a strong lensing analysis on the massive cluster Abell 370 (A370; z = 0.375), using combination of deep multi-band Hubble Space Telescope (HST) imaging and Multi-Unit Spectroscopic Explorer (MUSE) spectroscopy. From only two hours MUSE data, we are able to measure 120 redshifts in Southern BCG area, including several multiply-imaged lens systems. In total, increase number systems with secure redshift from 4 15, nine which newly discovered. Of these, eight located at > 3, greatly...
Reoviruses, enteroviruses, and adenoviruses were quantified by culture for various ambient waters in the Milwaukee area. From August 1994 through July 2003, influent effluent of a local wastewater treatment plant (WWTP) tested monthly modified U.S. Environmental Protection Agency Information Collection Rule (ICR) organic flocculation cell procedure detection culturable viruses. Modification ICR included using Caco-2, RD, HEp-2 cells addition to BGM cells. Lake Michigan source water two...
Cyanobacteria use large antenna complexes called phycobilisomes (PBSs) for light harvesting. However, intense triggers non-photochemical quenching, where the orange carotenoid protein (OCP) binds to PBS, dissipating excess energy as heat. The mechanism of efficiently transferring from phycocyanobilins in PBS canthaxanthin OCP remains insufficiently understood. Using cryo–electron microscopy, we unveiled OCP-PBS complex structure at 1.6- 2.1-angstrom resolution, showcasing its inherent...
ABSTRACT The quantity and serotypes of enteroviruses (EVs) in the influent a local sewage treatment plant were compared to clinical EV cases determine if testing is adequate for an surveillance system. study was carried out from August 1994 December 2002. Monthly specimens processed by organic flocculation, dilutions concentrate inoculated onto number different cell types virus isolation. EVs detected 88 100 monthly samples. Sewage titers calculated using software provided U.S. Environmental...
ABSTRACT In this paper we present the results of our search for and study <?CDATA $z\gtrsim 6$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>z</mml:mi> <mml:mo>≳</mml:mo> <mml:mn>6</mml:mn> </mml:math> galaxy candidates behind third Frontier Fields (FFs) cluster, MACS J0717.5+3745, its parallel field, combining data from Hubble Spitzer . We select 39 using Lyman break technique, which clear non-detection in optical make extreme mid- z interlopers...
We present the first estimate of Ly{\alpha} luminosity function using blind spectroscopy from Multi Unit Spectroscopic Explorer, MUSE, in Hubble Deep Field South. Using automatic source-detection software, we assemble a homogeneously-detected sample 59 emitters covering flux range -18.0 < log10 (F) -16.3 (erg s^-1 cm^-2), corresponding to luminosities 41.4 (L) 42.8 s^-1). As recent studies have shown, fluxes can be underestimated by factor two or more via traditional methods, and so...
Gemmatimonas phototrophica is, so far, the only described phototrophic species of bacterial phylum Gemmatimonadetes. Its cells contain a unique type photosynthetic complex with reaction center surrounded by double ring antenna, however they can also grow in dark using organic carbon substrates. photosynthesis genes were received via horizontal gene transfer from Proteobacteria. This raises two questions; how horizontally transferred apparatus has integrated into cellular machinery, and much...
Phototrophic Gemmatimonadetes evolved the ability to use solar energy following horizontal transfer of photosynthesis-related genes from an ancient phototrophic proteobacterium. The electron cryo-microscopy structure
Abstract Photosystem II (PSII) is the multi-subunit light-driven oxidoreductase that drives photosynthetic electron transport using electrons extracted from water. To investigate initial steps of PSII assembly, we used strains cyanobacterium Synechocystis sp. PCC 6803 arrested at early stages biogenesis and expressing affinity-tagged subunits to isolate reaction center assembly (RCII) complexes their precursor D1 D2 modules (D1mod D2mod). RCII preparations isolated either a His-tagged or...
Photosynthetic organisms harvest light for energy. Some eukaryotic algae have specialized in harvesting far-red by tuning chlorophyll a absorption through mechanism still to be elucidated. Here, we combined optically detected magnetic resonance and pulsed electron paramagnetic measurements on red-adapted light-harvesting complexes, rVCP, isolated from the freshwater eustigmatophyte alga Trachydiscus minutus identify location of pigments responsible this remarkable adaptation. The been found...
(Abridged) The HST Frontier Fields project started at the end of 2013 with aim providing extremely deep images 6 massive galaxy clusters. One main goals this program is to push several telescopes their limits in order provide best current view earliest stages Universe. We present a detailed analysis $z$$\sim$8 objects behind HFFs lensing cluster, MACS0416-2403, combining 0.3-1.6 $μ$m imaging from HST, ground-based $K_s$ VLT HAWK-I, and 3.6 4.5 Spitzer Space Telescope. apply classical Lyman...
Abstract Diatoms greatly contribute to carbon fixation and thus strongly influence the global biogeochemical balance. Capable of chromatic acclimation (CA) unfavourable light conditions, diatoms often dominate benthic ecosystems in addition their planktonic lifestyle. Although CA has been studied at molecular level, our understanding this phenomenon remains incomplete. Here we provide new data better explain acclimation-associated changes under red-enhanced ambient (RL) diatom Phaeodactylum...
We searched for z > 7 Lyman-break galaxies (LBGs) in the optical-to-mid-infrared Hubble Frontier Field and associated parallel field observations of strong-lensing cluster MACS J0416-2403. discovered 22 candidates, which six lie at 9 one lies 10. Based on Spitzer photometry, all have secure photometric redshifts a negligible probability being lower redshifts, according to their peak ratios, R. This substantial increase number known high-redshift allows solid determination luminosity function...
Spatial segregation of photosystems in the thylakoid membrane (lateral heterogeneity) observed plants and green algae is usually considered to be absent photoautotrophs possessing secondary plastids, such as diatoms. Contrary this assumption, here we show that membranes chloroplast a marine diatom, Phaeodactylum tricornutum, contain large areas occupied exclusively by supercomplex photosystem I (PSI) its associated Lhcr antenna. These areas, hundreds nanometers size, comprise tightly packed...
We present the results obtained with VLT/MUSE on faint-end of Lyman-alpha luminosity function (LF) based deep observations four lensing clusters. The precise aim study is to further constrain abundance emitters (LAEs) by taking advantage magnification provided blindly selected a sample 156 LAEs, redshifts between $2.9 \le z 6.7$ and magnification-corrected luminosities in range $ 39 \lesssim \log L_{Ly_{\alpha}}$ [erg s$^{-1}$] $\lesssim 43$. price pay benefit from reduction effective volume...