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  • 1.
    Andersson Ersman, Peter
    et al.
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Lassnig, Roman
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Strandberg, Jan
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Tu, Deyu
    Linköping University, Sweden.
    Keshmiri, Vahid
    Linköping University, Sweden.
    Forchheimer, Robert
    Linköping University, Sweden.
    Fabiano, Simone
    Linköping University, Sweden.
    Gustafsson, Göran
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Berggren, Magnus
    Linköping University, Sweden.
    All-printed large-scale integrated circuits based on organic electrochemical transistors2019Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 10, nr 1, artikkel-id 5053Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The communication outposts of the emerging Internet of Things are embodied by ordinary items, which desirably include all-printed flexible sensors, actuators, displays and akin organic electronic interface devices in combination with silicon-based digital signal processing and communication technologies. However, hybrid integration of smart electronic labels is partly hampered due to a lack of technology that (de)multiplex signals between silicon chips and printed electronic devices. Here, we report all-printed 4-to-7 decoders and seven-bit shift registers, including over 100 organic electrochemical transistors each, thus minimizing the number of terminals required to drive monolithically integrated all-printed electrochromic displays. These relatively advanced circuits are enabled by a reduction of the transistor footprint, an effort which includes several further developments of materials and screen printing processes. Our findings demonstrate that digital circuits based on organic electrochemical transistors (OECTs) provide a unique bridge between all-printed organic electronics (OEs) and low-cost silicon chip technology for Internet of Things applications. © 2019, The Author(s).

  • 2.
    Bybee, Connor
    et al.
    University of California, USA.
    Kleyko, Denis
    RISE Research Institutes of Sweden, Digitala system, Datavetenskap. University of California, USA.
    Nikonov, Dmitri E
    Intel, USA.
    Khosrowshahi, A.
    University of California, USA; Intel, USA.
    Olshausen, B. A.
    University of California, USA.
    Sommer, F. T.
    University of California, USA; Intel, USA.
    Efficient optimization with higher-order ising machines2023Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 14, artikkel-id 6033Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A prominent approach to solving combinatorial optimization problems on parallel hardware is Ising machines, i.e., hardware implementations of networks of interacting binary spin variables. Most Ising machines leverage second-order interactions although important classes of optimization problems, such as satisfiability problems, map more seamlessly to Ising networks with higher-order interactions. Here, we demonstrate that higher-order Ising machines can solve satisfiability problems more resource-efficiently in terms of the number of spin variables and their connections when compared to traditional second-order Ising machines. Further, our results show on a benchmark dataset of Boolean k-satisfiability problems that higher-order Ising machines implemented with coupled oscillators rapidly find solutions that are better than second-order Ising machines, thus, improving the current state-of-the-art for Ising machines. 

  • 3. Campeau, A.
    et al.
    Bishop, K.
    Amvrosiadi, Nino
    Uppsala University, Sweden.
    Billett, M. F.
    Garnett, M. H.
    Laudon, H.
    Öquist, M.G.
    Wallin, M. B.
    Current forest carbon fixation fuels stream CO 2 emissions2019Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 10, nr 1, artikkel-id 1876Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Stream CO 2 emissions contribute significantly to atmospheric climate forcing. While there are strong indications that groundwater inputs sustain these emissions, the specific biogeochemical pathways and timescales involved in this lateral CO 2 export are still obscure. Here, via an extensive radiocarbon ( 14 C) characterisation of CO 2 and DOC in stream water and its groundwater sources in an old-growth boreal forest, we demonstrate that the 14 C-CO 2 is consistently in tune with the current atmospheric 14 C-CO 2 level and shows little association with the 14 C-DOC in the same waters. Our findings thus indicate that stream CO 2 emissions act as a shortcut that returns CO 2 recently fixed by the forest vegetation to the atmosphere. Our results expose a positive feedback mechanism within the C budget of forested catchments, where stream CO 2 emissions will be highly sensitive to changes in forest C allocation patterns associated with climate and land-use changes. © 2019, The Author(s).

  • 4.
    Drake, Henrik
    et al.
    Linnaeus University, Sweden.
    Aström, Mats E.
    Linnaeus University, Sweden.
    Heim, Christine
    Georg-August University, Germany.
    Broman, Curt
    Stockholm University, Sweden.
    Aström, Jan
    CSC-IT Center for Science, Finland.
    Whitehouse, Martin
    Swedish Museum of Natural History, Sweden.
    Ivarsson, Magnus
    Swedish Museum of Natural History, Sweden.
    Siljeström, Sandra
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    Sjövall, Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Extreme 13 C depletion of carbonates formed during oxidation of biogenic methane in fractured granite2015Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 6, artikkel-id 7020Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Precipitation of exceptionally 13C-depleted authigenic carbonate is a result of, and thus a tracer for, sulphate-dependent anaerobic methane oxidation, particularly in marine sediments. Although these carbonates typically are less depleted in 13C than in the source methane, because of incorporation of C also from other sources, they are far more depleted in 13C (δ13C as light as -69% V-PDB) than in carbonates formed where no methane is involved. Here we show that oxidation of biogenic methane in carbon-poor deep groundwater in fractured granitoid rocks has resulted in fracture-wall precipitation of the most extremely 13Cdepleted carbonates ever reported, δ13C down to -125% V-PDB. A microbial consortium of sulphate reducers and methane oxidizers has been involved, as revealed by biomarker signatures in the carbonates and S-isotope compositions of co-genetic sulphide. Methane formed at shallow depths has been oxidized at several hundred metres depth at the transition to a deep-seated sulphate-rich saline water. This process is so far an unrecognized terrestrial sink of methane.

    Fulltekst (pdf)
    fulltext
  • 5.
    Drake, Henrik
    et al.
    Linnæus University, Sweden.
    Ivarsson, Magnus
    Swedish Museum of Natural History, Sweden.
    Bengtson, Stefan
    Swedish Museum of Natural History, Sweden.
    Heim, Christine
    Georg-August University, Germany.
    Siljeström, Sandra
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Whitehouse, Martin J.
    Swedish Museum of Natural History, Sweden.
    Broman, Curt
    Stockholm University, Sweden.
    Belivanova, Veneta
    Swedish Museum of Natural History, Sweden.
    Åström, Mats E.
    Linnæus University, Sweden.
    Anaerobic consortia of fungi and sulfate reducing bacteria in deep granite fractures2017Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 8, nr 1, artikkel-id 55Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The deep biosphere is one of the least understood ecosystems on Earth. Although most microbiological studies in this system have focused on prokaryotes and neglected microeukaryotes, recent discoveries have revealed existence of fossil and active fungi in marine sediments and sub-seafloor basalts, with proposed importance for the subsurface energy cycle. However, studies of fungi in deep continental crystalline rocks are surprisingly few. Consequently, the characteristics and processes of fungi and fungus-prokaryote interactions in this vast environment remain enigmatic. Here we report the first findings of partly organically preserved and partly mineralized fungi at great depth in fractured crystalline rock (-740 m). Based on environmental parameters and mineralogy the fungi are interpreted as anaerobic. Synchrotron-based techniques and stable isotope microanalysis confirm a coupling between the fungi and sulfate reducing bacteria. The cryptoendolithic fungi have significantly weathered neighboring zeolite crystals and thus have implications for storage of toxic wastes using zeolite barriers. © 2017 The Author(s).

  • 6.
    Drake, Henrik
    et al.
    Linnæus University, Sweden.
    Roberts, Nick
    British Geological Survey, UK.
    Heim, Christine
    Georg-August University, Germany.
    Whitehouse, Martin
    Swedish Museum of Natural History, Sweden.
    Siljeström, Sandra
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Kooijman, Ellen
    Swedish Museum of Natural History, Sweden.
    Broman, Curt
    Stockholm University, Sweden.
    Ivarsson, Magnus
    Swedish Museum of Natural History, Sweden; University of Southern Denmark, Denmark.
    Åström, Mats
    Linnæus University, Sweden.
    Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden2019Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 10, nr 1, artikkel-id 4736Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Fractured rocks of impact craters may be suitable hosts for deep microbial communities on Earth and potentially other terrestrial planets, yet direct evidence remains elusive. Here, we present a study of the largest crater of Europe, the Devonian Siljan structure, showing that impact structures can be important unexplored hosts for long-term deep microbial activity. Secondary carbonate minerals dated to 80 ± 5 to 22 ± 3 million years, and thus postdating the impact by more than 300 million years, have isotopic signatures revealing both microbial methanogenesis and anaerobic oxidation of methane in the bedrock. Hydrocarbons mobilized from matured shale source rocks were utilized by subsurface microorganisms, leading to accumulation of microbial methane mixed with a thermogenic and possibly a minor abiotic gas fraction beneath a sedimentary cap rock at the crater rim. These new insights into crater hosted gas accumulation and microbial activity have implications for understanding the astrobiological consequences of impacts. © 2019, The Author(s).

  • 7.
    He, Hans
    et al.
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Cedergren, Karin
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Shetty, Naveen
    Chalmers University of Technology, Sweden.
    Lara-Avila, Samuel
    Chalmers University of Technology, Sweden; NPL, UK.
    Kubatkin, Sergey
    Chalmers University of Technology, Sweden.
    Bergsten, Tobias
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Eklund, Gunnar
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Accurate graphene quantum Hall arrays for the new International System of Units2022Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 13, nr 1, artikkel-id 6933Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Graphene quantum Hall effect (QHE) resistance standards have the potential to provide superior realizations of three key units in the new International System of Units (SI): the ohm, the ampere, and the kilogram (Kibble Balance). However, these prospects require different resistance values than practically achievable in single graphene devices (~12.9 kΩ), and they need bias currents two orders of magnitude higher than typical breakdown currents IC ~ 100 μA. Here we present experiments on quantization accuracy of a 236-element quantum Hall array (QHA), demonstrating RK/236 ≈ 109 Ω with 0.2 part-per-billion (nΩ/Ω) accuracy with IC ≥ 5 mA (~1 nΩ/Ω accuracy for IC = 8.5 mA), using epitaxial graphene on silicon carbide (epigraphene). The array accuracy, comparable to the most precise universality tests of QHE, together with the scalability and reliability of this approach, pave the road for wider use of graphene in the new SI and beyond. © 2022, The Author(s).

    Fulltekst (pdf)
    fulltext
  • 8.
    He, Hans
    et al.
    Chalmers University of Technology, Sweden.
    Kim, K. H.
    Danilov, A.
    Montemurro, D.
    Yu, L.
    Park, Y. W.
    Lombardi, F.
    Bauch, T.
    Moth-Poulsen, K.
    Iakimov, T.
    Yakimova, R.
    Malmberg, P.
    MÃŒller, C.
    Kubatkin, S.
    Lara-Avila, S.
    Uniform doping of graphene close to the Dirac point by polymer-assisted assembly of molecular dopants2018Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 9, nr 1Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Tuning the charge carrier density of two-dimensional (2D) materials by incorporating dopants into the crystal lattice is a challenging task. An attractive alternative is the surface transfer doping by adsorption of molecules on 2D crystals, which can lead to ordered molecular arrays. However, such systems, demonstrated in ultra-high vacuum conditions (UHV), are often unstable in ambient conditions. Here we show that air-stable doping of epitaxial graphene on SiC—achieved by spin-coating deposition of 2,3,5,6-tetrafluoro-tetracyano-quino-dimethane (F4TCNQ) incorporated in poly(methyl-methacrylate)—proceeds via the spontaneous accumulation of dopants at the graphene-polymer interface and by the formation of a charge-transfer complex that yields low-disorder, charge-neutral, large-area graphene with carrier mobilities 70 000 cm2 V−1 s−1 at cryogenic temperatures. The assembly of dopants on 2D materials assisted by a polymer matrix, demonstrated by spin-coating wafer-scale substrates in ambient conditions, opens up a scalable technological route toward expanding the functionality of 2D materials. 

  • 9.
    Hertel, Stefan
    et al.
    Friedrich-Alexander University Erlangen-Nuremberg, Germany.
    Waldmann, Daniel
    Friedrich-Alexander University Erlangen-Nuremberg, Germany.
    Jobst, Johannes
    Friedrich-Alexander University Erlangen-Nuremberg, Germany.
    Albert, Andreas
    Friedrich-Alexander University Erlangen-Nuremberg, Germany.
    Albrecht, Martin
    Friedrich-Alexander University Erlangen-Nuremberg, Germany.
    Reshanov, Sergey A.
    RISE., Swedish ICT, Acreo.
    Schöner, Adolf
    RISE., Swedish ICT, Acreo.
    Krieger, Michael
    Friedrich-Alexander-Universität Erlangen-Nurnberg, Germany.
    Weber, Heiko B.
    Friedrich-Alexander-Universität Erlangen-Nurnberg, Germany.
    Tailoring the graphene/silicon carbide interface for monolithic wafer-scale electronics2012Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 3, artikkel-id 957Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Graphene is an outstanding electronic material, predicted to have a role in post-silicon electronics. However, owing to the absence of an electronic bandgap, graphene switching devices with high on/off ratio are still lacking. Here in the search for a comprehensive concept for wafer-scale graphene electronics, we present a monolithic transistor that uses the entire material system epitaxial graphene on silicon carbide (0001). This system consists of the graphene layer with its vanishing energy gap, the underlying semiconductor and their common interface. The graphene/semiconductor interfaces are tailor-made for ohmic as well as for Schottky contacts side-by-side on the same chip. We demonstrate normally on and normally off operation of a single transistor with on/off ratios exceeding 10 4 and no damping at megahertz frequencies. In its simplest realization, the fabrication process requires only one lithography step to build transistors, diodes, resistors and eventually integrated circuits without the need of metallic interconnects.

  • 10.
    Håkansson, Karl M.O.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Fall, Andreas
    KTH Royal Institute of Technology, Sweden.
    Lundell, Fredrik
    KTH Royal Institute of Technology, Sweden.
    Yu, S.
    DESY, Germany.
    Krywka, Christina A.
    University of Kiel, Germany; Helmholtz-Zentrum Geesthacht, Germany.
    Roth, Stephan Volkher
    University of Kiel, Germany.
    Santoro, Gonzalo
    DESY, Germany.
    Kvick, Mathias
    KTH Royal Institute of Technology, Sweden.
    Prahl Wittberg, Lisa
    KTH Royal Institute of Technology, Sweden.
    Wågberg, Lars Göran
    KTH Royal Institute of Technology, Sweden.
    Söderberg, L. Daniel
    RISE., Innventia. KTH Royal Institute of Technology, Sweden.
    Hydrodynamic alignment and assembly of nanofibrils resulting in strong cellulose filaments2014Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 5, artikkel-id 4018Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Cellulose nanofibrils can be obtained from trees and have considerable potential as a building block for biobased materials. In order to achieve good properties of these materials, the nanostructure must be controlled. Here we present a process combining hydrodynamic alignment with a dispersion-gel transition that produces homogeneous and smooth filaments from a low-concentration dispersion of cellulose nanofibrils in water. The preferential fibril orientation along the filament direction can be controlled by the process parameters. The specific ultimate strength is considerably higher than previously reported filaments made of cellulose nanofibrils. The strength is even in line with the strongest cellulose pulp fibres extracted from wood with the same degree of fibril alignment. Successful nanoscale alignment before gelation demands a proper separation of the timescales involved. Somewhat surprisingly, the device must not be too small if this is to be achieved.

  • 11.
    Jia, Shi
    et al.
    DTU Technical University of Denmark, Denmark.
    Lo, Mu-Chieh
    Universidad Carlos III de Madrid, Spain; University College London, UK.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden;Zhejiang University, China.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digitala system, Industriella system. KTH Royal Institute of Technology, Sweden; Riga Technical University, Latvia.
    Udalcovs, Aleksejs
    RISE Research Institutes of Sweden.
    Kong, Deming
    DTU Technical University of Denmark, Denmark.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Guzman, Robinson
    Universidad Carlos III de Madrid, Spain.
    Yu, Xianbin
    Zhejiang University, China.
    Xiao, Shilin
    Shanghai Jiao Tong University, China.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Carpintero, Guillermo
    Universidad Carlos III de Madrid, Spain.
    Morioka, Toshio
    DTU Technical University of Denmark, Denmark.
    Hu, Hao
    DTU Technical University of Denmark, Denmark.
    Oxenløwe, Leif
    DTU Technical University of Denmark, Denmark.
    Integrated dual-laser photonic chip for high-purity carrier generation enabling ultrafast terahertz wireless communications2022Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 13, nr 1, artikkel-id 1388Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Photonic generation of Terahertz (THz) carriers displays high potential for THz communications with a large tunable range and high modulation bandwidth. While many photonics-based THz generations have recently been demonstrated with discrete bulky components, their practical applications are significantly hindered by the large footprint and high energy consumption. Herein, we present an injection-locked heterodyne source based on generic foundry-fabricated photonic integrated circuits (PIC) attached to a uni-traveling carrier photodiode generating high-purity THz carriers. The generated THz carrier is tunable within the range of 0–1.4 THz, determined by the wavelength spacing between the two monolithically integrated distributed feedback (DFB) lasers. This scheme generates and transmits a 131 Gbits−1 net rate signal over a 10.7-m distance with −24 dBm emitted power at 0.4 THz. This monolithic dual-DFB PIC-based THz generation approach is a significant step towards fully integrated, cost-effective, and energy-efficient THz transmitters. © 2022, The Author(s).

  • 12.
    Lindgren, Johan
    et al.
    Lund University, Sweden.
    Uvdal, Per E.
    Lund University, Sweden.
    Sjövall, Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Nilsson, Dan Eric
    Lund University, Sweden.
    Engdahl, Anders
    Lund University, Sweden.
    Schultz, Bo Pagh
    Museum Salling, Denmark.
    Thiel, Volker
    University of Göttingen, Germany.
    Molecular preservation of the pigment melanin in fossil melanosmoses2012Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 3, artikkel-id 824Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Fossil feathers, hairs and eyes are regularly preserved as carbonized traces comprised of masses of micrometre-sized bodies that are spherical, oblate or elongate in shape. For a long time, these minute structures were regarded as the remains of biofilms of keratinophilic bacteria, but recently they have been reinterpreted as melanosomes; that is, colour-bearing organelles. Resolving this fundamental difference in interpretation is crucial: if endogenous then the fossil microbodies would represent a significant advancement in the fields of palaeontology and evolutionary biology given, for example, the possibility to reconstruct integumentary colours and plumage colour patterns. It has previously been shown that certain trace elements occur in fossils as organometallic compounds, and hence may be used as biomarkers for melanin pigments. Here we expand this knowledge by demonstrating the presence of molecularly preserved melanin in intimate association with melanosome-like microbodies isolated from an argentinoid fish eye from the early Eocene of Denmark.

  • 13.
    Oliaei, Erfan
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa. KTH Royal Institute of Technology, Sweden.
    Olsén, P.
    KTH Royal Institute of Technology, Sweden.
    Lindström, Tom S. C.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa.
    Berglund, L. A.
    KTH Royal Institute of Technology, Sweden.
    Highly reinforced and degradable lignocellulose biocomposites by polymerization of new polyester oligomers2022Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 13, nr 1, s. 5666-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Unbleached wood fibers and nanofibers are environmentally friendly bio-based candidates for material production, in particular, as reinforcements in polymer matrix biocomposites due to their low density and potential as carbon sink during the materials production phase. However, producing high reinforcement content biocomposites with degradable or chemically recyclable matrices is troublesome. Here, we address this issue with a new concept for facile and scalable in-situ polymerization of polyester matrices based on functionally balanced oligomers in pre-formed lignocellulosic networks. The idea enabled us to create high reinforcement biocomposites with well-dispersed mechanically undamaged fibers or nanocellulose. These degradable biocomposites have much higher mechanical properties than analogs in the literature. Reinforcement geometry (fibers at 30 µm or fibrils at 10-1000 nm diameter) influenced the polymerization and degradation of the polyester matrix. Overall, this work opens up new pathways toward environmentally benign materials in the context of a circular bioeconomy. © 2022. The Author(s).

  • 14. Papadakis, R.
    et al.
    Li, H.
    Bergman, J.
    Lundstedt, A.
    Jorner, K.
    Ayub, Rabia
    Uppsala University, Sweden.
    Haldar, S.
    Jahn, B. O.
    Denisova, A.
    Zietz, B.
    Lindh, R.
    Sanyal, B.
    Grennberg, H.
    Leifer, K.
    Ottosson, H.
    Metal-free photochemical silylations and transfer hydrogenations of benzenoid hydrocarbons and graphene2016Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 7, artikkel-id 12962Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The first hydrogenation step of benzene, which is endergonic in the electronic ground state (S 0), becomes exergonic in the first triplet state (T 1). This is in line with Baird's rule, which tells that benzene is antiaromatic and destabilized in its T 1 state and also in its first singlet excited state (S 1), opposite to S 0, where it is aromatic and remarkably unreactive. Here we utilized this feature to show that benzene and several polycyclic aromatic hydrocarbons (PAHs) to various extents undergo metal-free photochemical (hydro)silylations and transfer-hydrogenations at mild conditions, with the highest yield for naphthalene (photosilylation: 21%). Quantum chemical computations reveal that T 1-state benzene is excellent at H-atom abstraction, while cyclooctatetraene, aromatic in the T 1 and S 1 states according to Baird's rule, is unreactive. Remarkably, also CVD-graphene on SiO 2 is efficiently transfer-photohydrogenated using formic acid/water mixtures together with white light or solar irradiation under metal-free conditions. © The Author(s) 2016.

  • 15.
    Paulraj, T
    et al.
    KTH Royal Institute of Technology, Sweden.
    Wennmalm, S
    KTH Royal Institute of Technology, Sweden.
    Wieland, D
    Helmholtz-Zentrum Geesthacht, Germany.
    Riazanova, A V
    KTH Royal Institute of Technology, Sweden.
    Dėdinaitė, Andra
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel. KTH Royal Institute of Technology, Sweden.
    Günther Pomorski, T.
    Ruhr University Bochum, Germany; University of Copenhagen, Denmark.
    Cárdenas, M.
    Malmö University, Sweden.
    Svagan, A. J.
    KTH Royal Institute of Technology, Sweden.
    Primary cell wall inspired micro containers as a step towards a synthetic plant cell2020Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 11, nr 1, artikkel-id 958Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The structural integrity of living plant cells heavily relies on the plant cell wall containing a nanofibrous cellulose skeleton. Hence, if synthetic plant cells consist of such a cell wall, they would allow for manipulation into more complex synthetic plant structures. Herein, we have overcome the fundamental difficulties associated with assembling lipid vesicles with cellulosic nanofibers (CNFs). We prepare plantosomes with an outer shell of CNF and pectin, and beneath this, a thin layer of lipids (oleic acid and phospholipids) that surrounds a water core. By exploiting the phase behavior of the lipids, regulated by pH and Mg2+ ions, we form vesicle-crowded interiors that change the outer dimension of the plantosomes, mimicking the expansion in real plant cells during, e.g., growth. The internal pressure enables growth of lipid tubules through the plantosome cell wall, which paves the way to the development of hierarchical plant structures and advanced synthetic plant cell mimics. © 2020, The Author(s).

  • 16.
    Slater, Tiffany S.
    et al.
    University College Cork, Ireland.
    Ito, Shosuke
    Fujita Health University, Japan.
    Wakamatsu, Kazumasa
    Fujita Health University, Japan.
    Zhang, Fucheng
    Linyi University, China.
    Sjövall, Peter
    RISE Research Institutes of Sweden, Material och produktion, Metodik för produktframtagning.
    Jarenmark, Martin
    Lund University, Sweden.
    Lindgren, Johan
    Lund University, Sweden.
    McNamara, Maria E.
    University College Cork, Ireland.
    Taphonomic experiments reveal authentic molecular signals for fossil melanins and verify preservation of phaeomelanin in fossils2023Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 14, nr 1, artikkel-id 5651Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Melanin pigments play a critical role in physiological processes and shaping animal behaviour. Fossil melanin is a unique resource for understanding the functional evolution of melanin but the impact of fossilisation on molecular signatures for eumelanin and, especially, phaeomelanin is not fully understood. Here we present a model for the chemical taphonomy of fossil eumelanin and phaeomelanin based on thermal maturation experiments using feathers from extant birds. Our results reveal which molecular signatures are authentic signals for thermally matured eumelanin and phaeomelanin, which signatures are artefacts derived from the maturation of non-melanin molecules, and how these chemical data are impacted by sample preparation. Our model correctly predicts the molecular composition of eumelanins in diverse vertebrate fossils from the Miocene and Cretaceous and, critically, identifies direct molecular evidence for phaeomelanin in these fossils. This taphonomic framework adds to the geochemical toolbox that underpins reconstructions of melanin evolution and of melanin-based coloration in fossil vertebrates. 

  • 17.
    Svedang, Henrik
    et al.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Hornborg, Sara
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik. University of Gothenburg, Sweden.
    Selective fishing induces density-dependent growth2014Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 5, artikkel-id 4152Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Over the last decades, views on fisheries management have oscillated between alarm and trust in management progress. The predominant policy for remedying the world fishing crisis aims at maximum sustainable yield (MSY) by adjusting gear selectivity and fishing effort. Here we report a case study on how striving for higher yields from the Eastern Baltic cod stock by increasing selectivity has become exceedingly detrimental for its productivity. Although there is a successive increase in numbers of undersized fish, growth potential is severely reduced, and fishing mortality in fishable size has increased. Once density-dependent growth is introduced, the process is self-enforcing as long as the recruitment remains stable. Our findings suggest that policies focusing on maximum yield while targeting greater sizes are risky and should instead prioritize catch rates over yield. Disregarding the underlying population structure may jeopardize stock productivity, with dire consequences for the fishing industry and ecosystem structure and function.

  • 18. Usov, I.
    et al.
    Nyström, G.
    Adamcik, J.
    Handschin, S.
    Schätz, C.
    Fall, Andreas
    Stockholm University, Sweden.
    Bergström, L.
    Mezzenga, R.
    Understanding nanocellulose chirality and structure-properties relationship at the single fibril level2015Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 6Artikkel i tidsskrift (Fagfellevurdert)
  • 19. Watile, R. A.
    et al.
    Bunrit, A.
    Margalef, J.
    Akkarasamiyo, S.
    Ayub, Rabia
    Stockholm University, Sweden.
    Lagerspets, E.
    Biswas, S.
    Repo, T.
    Samec, J. S. M.
    Intramolecular substitutions of secondary and tertiary alcohols with chirality transfer by an iron(III) catalyst2019Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 10, nr 1, artikkel-id 3826Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Optically pure alcohols are abundant in nature and attractive as feedstock for organic synthesis but challenging for further transformation using atom efficient and sustainable methodologies, particularly when there is a desire to conserve the chirality. Usually, substitution of the OH group of stereogenic alcohols with conservation of chirality requires derivatization as part of a complex, stoichiometric procedure. We herein demonstrate that a simple, inexpensive, and environmentally benign iron(III) catalyst promotes the direct intramolecular substitution of enantiomerically enriched secondary and tertiary alcohols with O-, N-, and S-centered nucleophiles to generate valuable 5-membered, 6-membered and aryl-fused 6-membered heterocyclic compounds with chirality transfer and water as the only byproduct. The power of the methodology is demonstrated in the total synthesis of (+)-lentiginosine from D-glucose where iron-catalysis is used in a key step. Adoption of this methodology will contribute towards the transition to sustainable and bio-based processes in the pharmaceutical and agrochemical industries. © 2019, The Author(s).

  • 20.
    Yang, Hanmin
    et al.
    KTH Royal Institute of Technology, Sweden.
    Nuran Zaini, Ilman
    KTH Royal Institute of Technology, Sweden.
    Pan, Ruming
    Harbin Institute of Technology, China.
    Jin, Yanghao
    KTH Royal Institute of Technology, Sweden.
    Wang, Yazhe
    KTH Royal Institute of Technology, Sweden.
    Li, Lengwan
    KTH Royal Institute of Technology, Sweden.
    Caballero, José Juan Bolívar
    KTH Royal Institute of Technology, Sweden.
    Shi, Ziyi
    KTH Royal Institute of Technology, Sweden.
    Subasi, Yaprak
    Uppsala University, Sweden.
    Nurdiawati, Anissa
    KTH Royal Institute of Technology, Sweden.
    Wang, Shule
    Nanjing Forestry University, China; Chinese Academy of Forestry, China.
    Shen, Yazhou
    Imperial College London, United Kingdom.
    Wang, Tianxiang
    KTH Royal Institute of Technology, Sweden.
    Wang, Yue
    KTH Royal Institute of Technology, Sweden.
    Sandström, Linda
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Bioraffinaderi och energi.
    Jönsson, Pär G.
    KTH Royal Institute of Technology, Sweden.
    Yang, Weihong
    KTH Royal Institute of Technology, Sweden.
    Han, Tong
    KTH Royal Institute of Technology, Sweden.
    Distributed electrified heating for efficient hydrogen production2024Inngår i: Nature Communications, E-ISSN 2041-1723, Vol. 15, artikkel-id 3868Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study introduces a distributed electrified heating approach that is able to innovate chemical engineering involving endothermic reactions. It enables rapid and uniform heating of gaseous reactants, facilitating efficient conversion and high product selectivity at specific equilibrium. Demonstrated in catalyst-free CH4 pyrolysis, this approach achieves stable production of H2 (530 g h−1 L reactor−1) and carbon nanotube/fibers through 100% conversion of high-throughput CH4 at 1150 °C, surpassing the results obtained from many complex metal catalysts and high-temperature technologies. Additionally, in catalytic CH4 dry reforming, the distributed electrified heating using metallic monolith with unmodified Ni/MgO catalyst washcoat showcased excellent CH4 and CO2 conversion rates, and syngas production capacity. This innovative heating approach eliminates the need for elongated reactor tubes and external furnaces, promising an energy-concentrated and ultra-compact reactor design significantly smaller than traditional industrial systems, marking a significant advance towards more sustainable and efficient chemical engineering society.

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