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  1. Article: The influence of the Rashba effect.

    Stranks, Samuel D / Plochocka, Paulina

    Nature materials

    2018  Volume 17, Issue 5, Page(s) 381–382

    Language English
    Publishing date 2018-03-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2088679-2
    ISSN 1476-4660 ; 1476-1122
    ISSN (online) 1476-4660
    ISSN 1476-1122
    DOI 10.1038/s41563-018-0067-8
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  2. Article ; Online: Spectral Dependence of the Energy Transfer from Photosynthetic Complexes to Monolayer Graphene.

    Szalkowski, Marcin / Surrente, Alessandro / Wiwatowski, Kamil / Yang, Zhuo / Zhang, Nan / Olmos, Julian D Janna / Kargul, Joanna / Plochocka, Paulina / Maćkowski, Sebastian

    International journal of molecular sciences

    2022  Volume 23, Issue 7

    Abstract: Fluorescence excitation spectroscopy at cryogenic temperatures carried out on hybrid assemblies composed of photosynthetic complexes deposited on a monolayer graphene revealed that the efficiency of energy transfer to graphene strongly depended on the ... ...

    Abstract Fluorescence excitation spectroscopy at cryogenic temperatures carried out on hybrid assemblies composed of photosynthetic complexes deposited on a monolayer graphene revealed that the efficiency of energy transfer to graphene strongly depended on the excitation wavelength. The efficiency of this energy transfer was greatly enhanced in the blue-green spectral region. We observed clear resonance-like behavior for both a simple light-harvesting antenna containing only two chlorophyll molecules (PCP) and a large photochemically active reaction center associated with the light-harvesting antenna (PSI-LHCI), which pointed towards the general character of this effect.
    MeSH term(s) Chlorophyll/chemistry ; Energy Transfer ; Graphite ; Light-Harvesting Protein Complexes/metabolism ; Photosystem I Protein Complex/metabolism ; Spectrometry, Fluorescence
    Chemical Substances Light-Harvesting Protein Complexes ; Photosystem I Protein Complex ; Chlorophyll (1406-65-1) ; Graphite (7782-42-5)
    Language English
    Publishing date 2022-03-23
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms23073493
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  3. Article ; Online: Layered BiOI single crystals capable of detecting low dose rates of X-rays.

    Jagt, Robert A / Bravić, Ivona / Eyre, Lissa / Gałkowski, Krzysztof / Borowiec, Joanna / Dudipala, Kavya Reddy / Baranowski, Michał / Dyksik, Mateusz / van de Goor, Tim W J / Kreouzis, Theo / Xiao, Ming / Bevan, Adrian / Płochocka, Paulina / Stranks, Samuel D / Deschler, Felix / Monserrat, Bartomeu / MacManus-Driscoll, Judith L / Hoye, Robert L Z

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 2452

    Abstract: Detecting low dose rates of X-rays is critical for making safer radiology instruments, but is limited by the absorber materials available. Here, we develop bismuth oxyiodide (BiOI) single crystals into effective X-ray detectors. BiOI features complex ... ...

    Abstract Detecting low dose rates of X-rays is critical for making safer radiology instruments, but is limited by the absorber materials available. Here, we develop bismuth oxyiodide (BiOI) single crystals into effective X-ray detectors. BiOI features complex lattice dynamics, owing to the ionic character of the lattice and weak van der Waals interactions between layers. Through use of ultrafast spectroscopy, first-principles computations and detailed optical and structural characterisation, we show that photoexcited charge-carriers in BiOI couple to intralayer breathing phonon modes, forming large polarons, thus enabling longer drift lengths for the photoexcited carriers than would be expected if self-trapping occurred. This, combined with the low and stable dark currents and high linear X-ray attenuation coefficients, leads to strong detector performance. High sensitivities reaching 1.1  × 10
    Language English
    Publishing date 2023-04-28
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-38008-4
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  4. Article ; Online: Polaron Vibronic Progression Shapes the Optical Response of 2D Perovskites.

    Dyksik, Mateusz / Beret, Dorian / Baranowski, Michal / Duim, Herman / Moyano, Sébastien / Posmyk, Katarzyna / Mlayah, Adnen / Adjokatse, Sampson / Maude, Duncan K / Loi, Maria Antonietta / Puech, Pascal / Plochocka, Paulina

    Advanced science (Weinheim, Baden-Wurttemberg, Germany)

    2023  Volume 11, Issue 7, Page(s) e2305182

    Abstract: The optical response of 2D layered perovskites is composed of multiple equally-spaced spectral features, often interpreted as phonon replicas, separated by an energy Δ ≃ 12 - 40 meV, depending upon the compound. Here the authors show that the ... ...

    Abstract The optical response of 2D layered perovskites is composed of multiple equally-spaced spectral features, often interpreted as phonon replicas, separated by an energy Δ ≃ 12 - 40 meV, depending upon the compound. Here the authors show that the characteristic energy spacing, seen in both absorption and emission, is correlated with a substantial scattering response above ≃ 200 cm
    Language English
    Publishing date 2023-12-10
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2808093-2
    ISSN 2198-3844 ; 2198-3844
    ISSN (online) 2198-3844
    ISSN 2198-3844
    DOI 10.1002/advs.202305182
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  5. Article ; Online: Spectral Dependence of the Energy Transfer from Photosynthetic Complexes to Monolayer Graphene

    Marcin Szalkowski / Alessandro Surrente / Kamil Wiwatowski / Zhuo Yang / Nan Zhang / Julian D. Janna Olmos / Joanna Kargul / Paulina Plochocka / Sebastian Maćkowski

    International Journal of Molecular Sciences, Vol 23, Iss 3493, p

    2022  Volume 3493

    Abstract: Fluorescence excitation spectroscopy at cryogenic temperatures carried out on hybrid assemblies composed of photosynthetic complexes deposited on a monolayer graphene revealed that the efficiency of energy transfer to graphene strongly depended on the ... ...

    Abstract Fluorescence excitation spectroscopy at cryogenic temperatures carried out on hybrid assemblies composed of photosynthetic complexes deposited on a monolayer graphene revealed that the efficiency of energy transfer to graphene strongly depended on the excitation wavelength. The efficiency of this energy transfer was greatly enhanced in the blue-green spectral region. We observed clear resonance-like behavior for both a simple light-harvesting antenna containing only two chlorophyll molecules (PCP) and a large photochemically active reaction center associated with the light-harvesting antenna (PSI–LHCI), which pointed towards the general character of this effect.
    Keywords graphene ; energy transfer ; fluorescence ; photosynthetic complexes ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Language English
    Publishing date 2022-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article: Farnesyl diphosphate synthase; regulation of product specificity.

    Szkopińska, Anna / Płochocka, Danuta

    Acta biochimica Polonica

    2005  Volume 52, Issue 1, Page(s) 45–55

    Abstract: Farnesyl diphosphate synthase (FPPS) is a key enzyme in isoprenoid biosynthesis which supplies sesquiterpene precursors for several classes of essential metabolites including sterols, dolichols, ubiquinones and carotenoids as well as substrates for ... ...

    Abstract Farnesyl diphosphate synthase (FPPS) is a key enzyme in isoprenoid biosynthesis which supplies sesquiterpene precursors for several classes of essential metabolites including sterols, dolichols, ubiquinones and carotenoids as well as substrates for farnesylation and geranylgeranylation of proteins. It catalyzes the sequential head-to-tail condensation of two molecules of isopentenyl diphosphate with dimethylallyl diphosphate. The enzyme is a homodimer of subunits, typically having two aspartate-rich motifs with two sets of substrate binding sites for an allylic diphosphate and isopentenyl diphosphate per homodimer. The synthase amino-acid residues at the 4th and 5th positions before the first aspartate rich motif mainly determine product specificity. Hypothetically, type I (eukaryotic) and type II (eubacterial) FPPSs evolved from archeal geranylgeranyl diphosphate synthase by substitutions in the chain length determination region. FPPS belongs to enzymes encoded by gene families. In plants this offers the possibility of differential regulation in response to environmental changes or to herbivore or pathogen attack.
    MeSH term(s) Alkyl and Aryl Transferases/chemistry ; Alkyl and Aryl Transferases/metabolism ; Amino Acid Sequence ; Arginine/metabolism ; Dimerization ; Geranyltranstransferase ; Lysine/metabolism ; Models, Molecular ; Molecular Sequence Data ; Sequence Homology, Amino Acid ; Substrate Specificity
    Chemical Substances Arginine (94ZLA3W45F) ; Alkyl and Aryl Transferases (EC 2.5.-) ; Geranyltranstransferase (EC 2.5.1.10) ; Lysine (K3Z4F929H6)
    Language English
    Publishing date 2005
    Publishing country Poland
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 595762-x
    ISSN 1734-154X ; 0001-527X
    ISSN (online) 1734-154X
    ISSN 0001-527X
    DOI 055201045
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    In stock of ZB MED Cologne/Königswinter

    Zs.B 232: Show issues Location:
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    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
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  7. Article ; Online: Long-lived photoluminescence polarization of localized excitons in liquid exfoliated monolayer enriched WS

    Kłopotowski, Ł / Czechowski, N / Mitioglu, A A / Backes, C / Maude, D K / Plochocka, P

    Nanotechnology

    2018  Volume 29, Issue 33, Page(s) 335703

    Abstract: Monolayer transition metal dichalcogenides (TMDs) constitute a family of materials, in which coupled spin-valley physics can be explored and which could find applications in novel optoelectronic devices. However, before applications can be designed, a ... ...

    Abstract Monolayer transition metal dichalcogenides (TMDs) constitute a family of materials, in which coupled spin-valley physics can be explored and which could find applications in novel optoelectronic devices. However, before applications can be designed, a scalable method of monolayer extraction is required. Liquid phase exfoliation is a technique providing large quantities of the monolayer material, but the spin-valley properties of thus obtained TMDs are unknown. In this work, we employ steady-state and time-resolved photoluminescence (PL) to investigate the relaxation dynamics of localized excitons (LXs) in liquid exfoliated WS
    Language English
    Publishing date 2018-05-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/aac73e
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  8. Article ; Online: Different behaviors in vivo of mutations in the beta hairpin loop of the DNA polymerases of the closely related phages T4 and RB69.

    Trzemecka, Anna / Płochocka, Danuta / Bebenek, Anna

    Journal of molecular biology

    2009  Volume 389, Issue 5, Page(s) 797–807

    Abstract: The T4 and RB69 DNA replicative polymerases are members of the B family and are highly similar. Both replicate DNA with high fidelity and employ the same mechanism that allows efficient switching of the primer terminus between the polymerase and ... ...

    Abstract The T4 and RB69 DNA replicative polymerases are members of the B family and are highly similar. Both replicate DNA with high fidelity and employ the same mechanism that allows efficient switching of the primer terminus between the polymerase and exonuclease sites. Both polymerases have a beta hairpin loop (hereafter called the beta loop) in their exonuclease domains that plays an important role in active-site switching. The beta loop is involved in strand separation and is needed to stabilize partially strand-separated exonuclease complexes. In T4 DNA polymerase, modification of the beta-loop residue G255 to Ser confers a strong mutator phenotype in vivo due to a reduced ability to form editing complexes. Here, we describe the RB69 DNA polymerase mutant with the equivalent residue (G258) changed to Ser but showing only mild mutator activity in vivo. On the other hand, deletion of the tip of the RB69 beta loop confers a strong mutator phenotype in vivo. Based on detailed mutational spectral analyses, DNA binding activities, and coupled polymerase/exonuclease assays, we define the differences between the T4 and RB69 polymerases. We propose that their beta loops facilitate strand separation in both polymerases, while the residues that form the loop have low structural constraints.
    MeSH term(s) Base Sequence ; DNA, Viral/metabolism ; DNA-Directed DNA Polymerase/genetics ; DNA-Directed DNA Polymerase/metabolism ; Models, Molecular ; Molecular Sequence Data ; Mutagenesis, Site-Directed ; Mutation, Missense ; Protein Binding ; Protein Structure, Tertiary ; Sequence Deletion ; Viral Proteins/genetics ; Viral Proteins/metabolism
    Chemical Substances DNA, Viral ; Viral Proteins ; gene 43 protein, Enterobacteria phage T4 ; DNA-Directed DNA Polymerase (EC 2.7.7.7) ; bacteriophage RB69 DNA polymerase (EC 2.7.7.7)
    Language English
    Publishing date 2009-06-26
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80229-3
    ISSN 1089-8638 ; 0022-2836
    ISSN (online) 1089-8638
    ISSN 0022-2836
    DOI 10.1016/j.jmb.2009.04.055
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    Zs.A 867: Show issues Location:
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  9. Article ; Online: Interlayer excitons in MoSe

    Karpińska, M / Jasiński, J / Kempt, R / Ziegler, J D / Sansom, H / Taniguchi, T / Watanabe, K / Snaith, H J / Surrente, A / Dyksik, M / Maude, D K / Kłopotowski, Ł / Chernikov, A / Kuc, A / Baranowski, M / Plochocka, P

    Nanoscale

    2022  Volume 14, Issue 22, Page(s) 8085–8095

    Abstract: van der Waals crystals have opened a new and exciting chapter in heterostructure research, removing the lattice matching constraint characteristics of epitaxial semiconductors. They provide unprecedented flexibility for heterostructure design. Combining ... ...

    Abstract van der Waals crystals have opened a new and exciting chapter in heterostructure research, removing the lattice matching constraint characteristics of epitaxial semiconductors. They provide unprecedented flexibility for heterostructure design. Combining two-dimensional (2D) perovskites with other 2D materials, in particular transition metal dichalcogenides (TMDs), has recently emerged as an intriguing way to design hybrid opto-electronic devices. However, the excitation transfer mechanism between the layers (charge or energy transfer) remains to be elucidated. Here, we investigate PEA
    Language English
    Publishing date 2022-06-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d2nr00877g
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  10. Article ; Online: Microscopic Picture of Electron-Phonon Interaction in Two-Dimensional Halide Perovskites.

    Feldstein, David / Perea-Causín, Raül / Wang, Shuli / Dyksik, Mateusz / Watanabe, Kenji / Taniguchi, Takashi / Plochocka, Paulina / Malic, Ermin

    The journal of physical chemistry letters

    2020  Volume 11, Issue 23, Page(s) 9975–9982

    Abstract: Perovskites have attracted much attention due to their remarkable optical properties. While it is well established that excitons dominate their optical response, the impact of higher excitonic states and formation of phonon sidebands in optical spectra ... ...

    Abstract Perovskites have attracted much attention due to their remarkable optical properties. While it is well established that excitons dominate their optical response, the impact of higher excitonic states and formation of phonon sidebands in optical spectra still need to be better understood. Here, we perform a theoretical study of excitonic properties of monolayered hybrid organic perovskites-supported by temperature-dependent photoluminescence measurements. Solving the Wannier equation, we obtain microscopic access to the Rydberg-like series of excitonic states including their wave functions and binding energies. Exploiting the generalized Elliot formula, we calculate the photoluminescence spectra demonstrating a pronounced contribution of a phonon sideband for temperatures up to 50 K, in agreement with experimental measurements. Finally, we predict temperature-dependent line widths of the three energetically lowest excitonic transitions and identify the underlying phonon-driven scattering processes.
    Language English
    Publishing date 2020-11-12
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.0c02661
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