1
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Falik O, Hoffmann I, Novoplansky A. A novel type of neighbour perception elicits reproductive plasticity in an annual plant with a mixed mating system. Plant Biol (Stuttg) 2024; 26:415-420. [PMID: 38315483 DOI: 10.1111/plb.13624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Accepted: 01/17/2024] [Indexed: 02/07/2024]
Abstract
Plants display various forms of phenotypic plasticity in anticipation of changing conditions, many of which are influenced by information obtained from neighbouring plants. Here, we tested the hypothesis that cleistogamic Lamium amplexicaule plants can adaptively modify production of chasmogamous (CH) and cleistogamous (CL) flowers based on the perception of conspecific neighbours. The production and proportion of CH and CL flowers was examined in individual L. amplexicaule grown at varying densities or treated with root leachates from plants grown at different densities. When growing at high density or treated with root leachates from high-density pots, L. amplexicaule increased production of more expensive, potentially outcrossing CH flowers. In contrast, single plants or plants treated with root leachates from empty pots or single-source plants predominantly developed cheaper, self-pollinated CL flowers. The results demonstrate a novel root-based neighbour-perception modality that enables plants to adaptively adjust production of CH and CL flowers in response to the presence of potential reproductive partners. Further research is needed to explore the broader ecological implications of this novel interplant cueing on reproductive bet-hedging and plasticity in natural settings, as well as to identify the involved cues and their mode of operation.
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Affiliation(s)
- O Falik
- Mitrani Department of Desert Ecology, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben Gurion, Israel
- Achva Academic College, Arugot, Israel
| | - I Hoffmann
- Mitrani Department of Desert Ecology, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben Gurion, Israel
| | - A Novoplansky
- Mitrani Department of Desert Ecology, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben Gurion, Israel
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2
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Kruteva M, Allgaier J, Monkenbusch M, Valiullin R, Hoffmann I, Richter D. Cooperative Dynamics of Highly Entangled Linear Polymers within the Entanglement Tube. ACS Macro Lett 2024; 13:335-340. [PMID: 38427591 PMCID: PMC10956489 DOI: 10.1021/acsmacrolett.3c00738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 02/16/2024] [Accepted: 02/27/2024] [Indexed: 03/03/2024]
Abstract
We present a quantitative comparison of the dynamic structure factors from unentangled and strongly entangled poly(butylene oxide) (PBO) melts. As expected, the low molecular weight PBO displays Rouse dynamics, however, with very significant subdiffusive center-of-mass diffusion. The spectra from high molecular weight entangled PBO can be very well described by the dynamic structure factor based on the concept of local reptation, including the Rouse dynamics within the tube and allowing for non-Gaussian corrections. Comparing quantitatively the spectra from both polymers leads to the surprising result that their spectra differ only by the contribution of classical Rouse diffusion for the low molecular weight melt. The subdiffusive component is common for both the low and high molecular weight PBO melts, indicating that in both melts the same interchain potential is active, thereby supporting the validity of the Generalized Langevin Equation approach.
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Affiliation(s)
- Margarita Kruteva
- Jülich
Centre for Neutron Science (JCNS-1) and Institute for Biological Information
Processing (IBI-8), Forschungszentrum Jülich
GmbH, 52428 Jülich, Germany
| | - Jürgen Allgaier
- Jülich
Centre for Neutron Science (JCNS-1) and Institute for Biological Information
Processing (IBI-8), Forschungszentrum Jülich
GmbH, 52428 Jülich, Germany
| | - Michael Monkenbusch
- Jülich
Centre for Neutron Science (JCNS-1) and Institute for Biological Information
Processing (IBI-8), Forschungszentrum Jülich
GmbH, 52428 Jülich, Germany
| | - Rustem Valiullin
- Felix
Bloch Institute for Solid State Physics, Leipzig University, 04103 Leipzig, Germany
| | - Ingo Hoffmann
- Institut
Laue-Langevin (ILL), 71 avenue des Martyrs, 38000 Grenoble, France
| | - Dieter Richter
- Jülich
Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute
(PGI-4), Forschungszentrum Jülich
GmbH, 52428 Jülich, Germany
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3
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Granek R, Hoffmann I, Kelley EG, Nagao M, Vlahovska PM, Zilman A. Dynamic structure factor of undulating vesicles: finite-size and spherical geometry effects with application to neutron spin echo experiments. Eur Phys J E Soft Matter 2024; 47:12. [PMID: 38355850 DOI: 10.1140/epje/s10189-023-00400-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Accepted: 12/11/2023] [Indexed: 02/16/2024]
Abstract
We consider the dynamic structure factor (DSF) of quasi-spherical vesicles and present a generalization of an expression that was originally formulated by Zilman and Granek (ZG) for scattering from isotropically oriented quasi-flat membrane plaquettes. The expression is obtained in the form of a multi-dimensional integral over the undulating membrane surface. The new expression reduces to the original stretched exponential form in the limit of sufficiently large vesicles, i.e., in the micron range or larger. For much smaller unilamellar vesicles, deviations from the asymptotic, stretched exponential equation are noticeable even if one assumes that the Seifert-Langer leaflet density mode is completely relaxed and membrane viscosity is neglected. To avoid the need for an exhaustive numerical integration while fitting to neutron spin echo (NSE) data, we provide a useful approximation for polydisperse systems that tests well against the numerical integration of the complete expression. To validate the new expression, we performed NSE experiments on variable-size vesicles made of a POPC/POPS lipid mixture and demonstrate an advantage over the original stretched exponential form or other manipulations of the original ZG expression that have been deployed over the years to fit the NSE data. In particular, values of the membrane bending rigidity extracted from the NSE data using the new approximations were insensitive to the vesicle radii and scattering wavenumber and compared very well with expected values of the effective bending modulus ([Formula: see text]) calculated from results in the literature. Moreover, the generalized scattering theory presented here for an undulating quasi-spherical shell can be easily extended to other models for the membrane undulation dynamics beyond the Helfrich Hamiltonian and thereby provides the foundation for the study of the nanoscale dynamics in more complex and biologically relevant model membrane systems.
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Affiliation(s)
- Rony Granek
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, and Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, 84105, Beer Sheva, Israel.
| | - Ingo Hoffmann
- Institut Laue-Langevin (ILL), 71 Avenue des Martys, 38042, Grenoble, CEDEX 9, France.
| | - Elizabeth G Kelley
- Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD, 20899, USA.
| | - Michihiro Nagao
- Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD, 20899, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA
- Department of Physics and Astronomy, University of Delaware, Newark, DE, 19716, USA
| | - Petia M Vlahovska
- Department of Engineering Sciences and Applied Mathematics, Northwestern University, Evanston, IL, 60208, USA
| | - Anton Zilman
- Department of Physics, University of Toronto, 60 St George St, Toronto, ON, M5S 1A7, Canada
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4
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Börner CJ, Hoffmann I, Stiebel JH. Ideal Agent System with Triplet States: Model Parameter Identification of Agent-Field Interaction. Entropy (Basel) 2023; 25:1666. [PMID: 38136546 PMCID: PMC10743297 DOI: 10.3390/e25121666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/09/2023] [Accepted: 12/13/2023] [Indexed: 12/24/2023]
Abstract
On the capital market, price movements of stock corporations can be observed independent of overall market developments as a result of company-specific news, which suggests the occurrence of a sudden risk event. In recent years, numerous concepts from statistical physics have been transferred to econometrics to model these effects and other issues, e.g., in socioeconomics. Like other studies, we extend the approaches based on the "buy" and "sell" positions of agents (investors' stance) with a third "hold" position. We develop the corresponding theory within the framework of the microcanonical and canonical ensembles for an ideal agent system and apply it to a capital market example. We thereby design a procedure to estimate the required model parameters from time series on the capital market. The aim is the appropriate modeling and the one-step-ahead assessment of the effect of a sudden risk event. From a one-step-ahead performance comparison with selected benchmark approaches, we infer that the model is well-specified and the model parameters are well determined.
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Affiliation(s)
| | | | - John H. Stiebel
- Financial Services, Faculty of Business Administration and Economics, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
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5
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Sohmen B, Beck C, Frank V, Seydel T, Hoffmann I, Hermann B, Nüesch M, Grimaldo M, Schreiber F, Wolf S, Roosen‐Runge F, Hugel T. The Onset of Molecule-Spanning Dynamics in Heat Shock Protein Hsp90. Adv Sci (Weinh) 2023; 10:e2304262. [PMID: 37984887 PMCID: PMC10754087 DOI: 10.1002/advs.202304262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 10/06/2023] [Indexed: 11/22/2023]
Abstract
Protein dynamics have been investigated on a wide range of time scales. Nano- and picosecond dynamics have been assigned to local fluctuations, while slower dynamics have been attributed to larger conformational changes. However, it is largely unknown how fast (local) fluctuations can lead to slow global (allosteric) changes. Here, fast molecule-spanning dynamics on the 100 to 200 ns time scale in the heat shock protein 90 (Hsp90) are shown. Global real-space movements are assigned to dynamic modes on this time scale, which is possible by a combination of single-molecule fluorescence, quasi-elastic neutron scattering and all-atom molecular dynamics (MD) simulations. The time scale of these dynamic modes depends on the conformational state of the Hsp90 dimer. In addition, the dynamic modes are affected to various degrees by Sba1, a co-chaperone of Hsp90, depending on the location within Hsp90, which is in very good agreement with MD simulations. Altogether, this data is best described by fast molecule-spanning dynamics, which precede larger conformational changes in Hsp90 and might be the molecular basis for allostery. This integrative approach provides comprehensive insights into molecule-spanning dynamics on the nanosecond time scale for a multi-domain protein.
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Affiliation(s)
- Benedikt Sohmen
- Institute of Physical ChemistryUniversity of FreiburgAlbertstrasse 2179104FreiburgGermany
| | - Christian Beck
- Institute of Applied PhysicsUniversity of TübingenAuf der Morgenstelle 1072076TübingenGermany
- Science DivisionInstitut Max von Laue ‐ Paul Langevin71 avenue des MartyrsGrenoble38042France
| | - Veronika Frank
- Institute of Physical ChemistryUniversity of FreiburgAlbertstrasse 2179104FreiburgGermany
| | - Tilo Seydel
- Science DivisionInstitut Max von Laue ‐ Paul Langevin71 avenue des MartyrsGrenoble38042France
| | - Ingo Hoffmann
- Science DivisionInstitut Max von Laue ‐ Paul Langevin71 avenue des MartyrsGrenoble38042France
| | - Bianca Hermann
- Institute of Physical ChemistryUniversity of FreiburgAlbertstrasse 2179104FreiburgGermany
| | - Mark Nüesch
- Department of BiochemistryUniversity of ZurichWinterthurerstrasse 190CH‐8057ZurichSwitzerland
| | - Marco Grimaldo
- Science DivisionInstitut Max von Laue ‐ Paul Langevin71 avenue des MartyrsGrenoble38042France
| | - Frank Schreiber
- Institute of Applied PhysicsUniversity of TübingenAuf der Morgenstelle 1072076TübingenGermany
| | - Steffen Wolf
- Biomolecular Dynamics, Institute of PhysicsUniversity of FreiburgHermann‐Herder‐Strasse 379104FreiburgGermany
| | - Felix Roosen‐Runge
- Department of Biomedical Sciences and Biofilms‐Research Center for Biointerfaces (BRCB)Malmö University20506MalmöSweden
- Division of Physical ChemistryLund UniversityNaturvetarvägen 1422100LundSweden
| | - Thorsten Hugel
- Institute of Physical ChemistryUniversity of FreiburgAlbertstrasse 2179104FreiburgGermany
- Signalling Research Centers BIOSS and CIBSSUniversity of FreiburgSchänzlestrasse 1879104FreiburgGermany
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6
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Buvalaia E, Kruteva M, Hoffmann I, Radulescu A, Förster S, Biehl R. Interchain Hydrodynamic Interaction and Internal Friction of Polyelectrolytes. ACS Macro Lett 2023; 12:1218-1223. [PMID: 37624592 PMCID: PMC10515639 DOI: 10.1021/acsmacrolett.3c00409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 08/17/2023] [Indexed: 08/26/2023]
Abstract
Polyelectrolytes (PE) are polymeric macromolecules in aqueous solutions characterized by their chain topology and intrinsic charge in a neutralizing fluid. Structure and dynamics are related to several characteristic screening length scales determined by electrostatic, excluded volume, and hydrodynamic interactions. We examine PE dynamics in dilute to semidilute conditions using dynamic light scattering, neutron spinecho spectroscopy, and pulse field gradient NMR spectroscopy. We connect macroscopic diffusion to segmental chain dynamics, revealing a decoupling of local chain dynamics from interchain interactions. Collective diffusion is described within a colloidal picture, including electrostatic and hydrodynamic interactions. Chain dynamics is characterized by the classical Zimm model of a neutral chain retarded by internal friction. We observe that hydrodynamic interactions are not fully screened between chains and that the internal friction within the chain increases with an increase in ion condensation on the chain.
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Affiliation(s)
- Ekaterina Buvalaia
- Jülich
Centre for Neutron Science JCNS and Institute of Biological Information
Processing IBI, Forschungszentrum Jülich
GmbH, 52425 Jülich, Germany
| | - Margarita Kruteva
- Jülich
Centre for Neutron Science JCNS and Institute of Biological Information
Processing IBI, Forschungszentrum Jülich
GmbH, 52425 Jülich, Germany
| | - Ingo Hoffmann
- Institut
Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042
CEDEX 9 Grenoble, France
| | - Aurel Radulescu
- Jülich
Centre for Neutron Science JCNS at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, 85748 Garching, Germany
| | - Stephan Förster
- Jülich
Centre for Neutron Science JCNS and Institute of Biological Information
Processing IBI, Forschungszentrum Jülich
GmbH, 52425 Jülich, Germany
| | - Ralf Biehl
- Jülich
Centre for Neutron Science JCNS and Institute of Biological Information
Processing IBI, Forschungszentrum Jülich
GmbH, 52425 Jülich, Germany
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7
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LoRicco JG, Hoffmann I, Caliò A, Peters J. The membrane regulator squalane increases membrane rigidity under high hydrostatic pressure in archaeal membrane mimics. Soft Matter 2023; 19:6280-6286. [PMID: 37553974 DOI: 10.1039/d3sm00352c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
Apolar lipids within the membranes of archaea are thought to play a role in membrane regulation. In this work we explore the effect of the apolar lipid squalane on the dynamics of a model archaeal-like membrane, under pressure, using neutron spin echo spectroscopy. To the best of our knowledge, this is the first report on membrane dynamics at high pressure using NSE spectroscopy. Increasing pressure leads to an increase in membrane rigidity, in agreement with other techniques. The presence of squalane in the membrane results in a stiffer membrane supporting its role as a membrane regulator.
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Affiliation(s)
| | | | - Antonino Caliò
- Université de Lyon, INSA Lyon, CNRS, MAP UMR 5240, Villeurbanne, France
| | - Judith Peters
- Institut Laue-Langevin, Grenoble, France.
- Univ. Grenoble Alpes, CNRS, LiPhy, Grenoble, France
- Institut Universitaire de France, 75231 Paris, France
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8
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Goedegebuur J, Abbel D, Accassat S, Achterberg WP, Akbari A, Arfuch VM, Baddeley E, Bax JJ, Becker D, Bergmeijer B, Bertoletti L, Blom JW, Calvetti A, Cannegieter SC, Castro L, Chavannes NH, Coma-Auli N, Couffignal C, Edwards A, Edwards M, Enggaard H, Font C, Gava A, Geersing GJ, Geijteman ECT, Greenley S, Gregory C, Gussekloo J, Hoffmann I, Højen AA, van den Hout WB, Huisman MV, Jacobsen S, Jagosh J, Johnson MJ, Jørgensen L, Juffermans CCM, Kempers EK, Konstantinides S, Kroder AF, Kruip MJHA, Lafaie L, Langendoen JW, Larsen TB, Lifford K, van der Linden YM, Mahé I, Maiorana L, Maraveyas A, Martens ESL, Mayeur D, van Mens TE, Mohr K, Mooijaart SP, Murtagh FEM, Nelson A, Nielsen PB, Ording AG, Ørskov M, Pearson M, Poenou G, Portielje JEA, Raczkiewicz D, Rasmussen K, Trinks-Roerdink E, Schippers I, Seddon K, Sexton K, Sivell S, Skjøth F, Søgaard M, Szmit S, Trompet S, Vassal P, Visser C, van Vliet LM, Wilson E, Klok FA, Noble SIR. Towards optimal use of antithrombotic therapy of people with cancer at the end of life: A research protocol for the development and implementation of the SERENITY shared decision support tool. Thromb Res 2023; 228:54-60. [PMID: 37276718 DOI: 10.1016/j.thromres.2023.05.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 05/02/2023] [Accepted: 05/05/2023] [Indexed: 06/07/2023]
Abstract
BACKGROUND Even though antithrombotic therapy has probably little or even negative effects on the well-being of people with cancer during their last year of life, deprescribing antithrombotic therapy at the end of life is rare in practice. It is often continued until death, possibly resulting in excess bleeding, an increased disease burden and higher healthcare costs. METHODS The SERENITY consortium comprises researchers and clinicians from eight European countries with specialties in different clinical fields, epidemiology and psychology. SERENITY will use a comprehensive approach combining a realist review, flash mob research, epidemiological studies, and qualitative interviews. The results of these studies will be used in a Delphi process to reach a consensus on the optimal design of the shared decision support tool. Next, the shared decision support tool will be tested in a randomised controlled trial. A targeted implementation and dissemination plan will be developed to enable the use of the SERENITY tool across Europe, as well as its incorporation in clinical guidelines and policies. The entire project is funded by Horizon Europe. RESULTS SERENITY will develop an information-driven shared decision support tool that will facilitate treatment decisions regarding the appropriate use of antithrombotic therapy in people with cancer at the end of life. CONCLUSIONS We aim to develop an intervention that guides the appropriate use of antithrombotic therapy, prevents bleeding complications, and saves healthcare costs. Hopefully, usage of the tool leads to enhanced empowerment and improved quality of life and treatment satisfaction of people with advanced cancer and their care givers.
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Affiliation(s)
- J Goedegebuur
- Department of Medicine - Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands; Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | - D Abbel
- Department of Medicine - Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands; Department of Medicine - Internal Medicine and Geriatrics, Leiden University Medical Center, Leiden, the Netherlands
| | - S Accassat
- Department of Vascular and Therapeutical Medicine, University Hospital of Saint-Etienne, Saint-Étienne, France
| | - W P Achterberg
- Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, the Netherlands
| | - A Akbari
- Swansea University, Swansea, Wales, United Kingdom
| | - V M Arfuch
- Department of Medical Oncology, Hospital Clinic Barcelona, Clinical Institute of Haematological and Oncological Diseases (ICMHO), IDIBAPS, Barcelona, Spain
| | - E Baddeley
- Cardiff University, Cardiff, United Kingdom
| | - J J Bax
- Department of Medicine - Cardiology, Leiden University Medical Center, Leiden, the Netherlands
| | - D Becker
- University Medical Center Mainz, Mainz, Germany
| | | | - L Bertoletti
- Department of Vascular and Therapeutical Medicine, Jean Monnet University, University Hospital of Saint-Étienne, Saint-Étienne, France
| | - J W Blom
- Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, the Netherlands
| | - A Calvetti
- Assistance Publique-Hopitaux de Paris, Paris, France
| | - S C Cannegieter
- Department of Medicine - Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands; Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | - L Castro
- Vall d'Hebron Research Institute, Barcelona, Spain
| | - N H Chavannes
- Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, the Netherlands
| | - N Coma-Auli
- Department of Medical Oncology, Hospital Clinic Barcelona, Clinical Institute of Haematological and Oncological Diseases (ICMHO), IDIBAPS, Barcelona, Spain
| | - C Couffignal
- Hôpital Louis Mourier, APHP, Assistance Publique-Hopitaux de Paris, Paris, France
| | - A Edwards
- Cardiff University, Cardiff, United Kingdom
| | - M Edwards
- Cardiff University, Cardiff, United Kingdom
| | - H Enggaard
- Aalborg University Hospital, Aalborg, Denmark
| | - C Font
- Department of Medical Oncology, Hospital Clinic Barcelona, Clinical Institute of Haematological and Oncological Diseases (ICMHO), IDIBAPS, Barcelona, Spain
| | - A Gava
- Societa per l'Assistenza al Malato Oncologico Terminale Onlus (S.A.M.O.T.) Ragusa Onlus, Ragusa, Italy
| | - G J Geersing
- Julius Center for Health Sciences and Primary Care, Department of General Practice, University Medical Center Utrecht, Utrecht, the Netherlands
| | - E C T Geijteman
- Department of Medical Oncology, Erasmus Medical Center, Rotterdam, the Netherlands
| | - S Greenley
- Wolfson Palliative Care Research Centre, Hull York Medical School, University of Hull, Hull, United Kingdom
| | - C Gregory
- Cardiff University, Cardiff, United Kingdom
| | - J Gussekloo
- Department of Medicine - Internal Medicine and Geriatrics, Leiden University Medical Center, Leiden, the Netherlands; Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, the Netherlands
| | - I Hoffmann
- Hôpital Bichat, APHP, Assistance Publique-Hopitaux de Paris, Paris, France
| | - A A Højen
- Aalborg University Hospital, Aalborg, Denmark
| | - W B van den Hout
- Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, the Netherlands
| | - M V Huisman
- Department of Medicine - Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands
| | - S Jacobsen
- Aalborg University Hospital, Aalborg, Denmark
| | - J Jagosh
- Wolfson Palliative Care Research Centre, Hull York Medical School, University of Hull, Hull, United Kingdom
| | - M J Johnson
- Wolfson Palliative Care Research Centre, Hull York Medical School, University of Hull, Hull, United Kingdom
| | - L Jørgensen
- Aalborg University Hospital, Aalborg, Denmark
| | - C C M Juffermans
- Centre of Expertise in Palliative Care, Leiden University Medical Center, Leiden, the Netherlands
| | - E K Kempers
- Department of Hematology, Erasmus MC, Erasmus University Medical Center, Rotterdam, the Netherlands
| | | | - A F Kroder
- Todaytomorrow, Rotterdam, the Netherlands
| | - M J H A Kruip
- Department of Hematology, Erasmus MC, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - L Lafaie
- Department of Geriatrics and Gerontology, Jean Monnet University, University Hospital of Saint-Étienne, Saint-Étienne, France
| | | | - T B Larsen
- Aalborg University Hospital, Aalborg, Denmark
| | - K Lifford
- Cardiff University, Cardiff, United Kingdom
| | - Y M van der Linden
- Centre of Expertise in Palliative Care, Leiden University Medical Center, Leiden, the Netherlands; Netherlands Comprehensive Cancer Organization, Utrecht, the Netherlands
| | - I Mahé
- Department of Innovative Therapies in Haemostasis, Hôpital Louis Mourier, APHP, Paris, France
| | - L Maiorana
- Societa per l'Assistenza al Malato Oncologico Terminale Onlus (S.A.M.O.T.) Ragusa Onlus, Ragusa, Italy
| | - A Maraveyas
- Clinical Sciences Centre Hull York Medical School University of Hull, Hull, United Kingdom
| | - E S L Martens
- Department of Medicine - Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands
| | - D Mayeur
- Centre Georges-François Leclerc, Dijon, France
| | - T E van Mens
- Department of Medicine - Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands
| | - K Mohr
- University Medical Center Mainz, Mainz, Germany
| | - S P Mooijaart
- Department of Medicine - Internal Medicine and Geriatrics, Leiden University Medical Center, Leiden, the Netherlands
| | - F E M Murtagh
- Wolfson Palliative Care Research Centre, Hull York Medical School, University of Hull, Hull, United Kingdom
| | - A Nelson
- Cardiff University, Cardiff, United Kingdom
| | - P B Nielsen
- Aalborg University Hospital, Aalborg, Denmark
| | - A G Ording
- Aalborg University Hospital, Aalborg, Denmark
| | - M Ørskov
- Aalborg University Hospital, Aalborg, Denmark
| | - M Pearson
- Wolfson Palliative Care Research Centre, Hull York Medical School, University of Hull, Hull, United Kingdom
| | - G Poenou
- Department of Vascular and Therapeutical Medicine, Jean Monnet University, University Hospital of Saint-Étienne, Saint-Étienne, France
| | - J E A Portielje
- Department of Medicine - Internal medicine and Medical Oncology, Leiden University Medical Center, Leiden, the Netherlands
| | - D Raczkiewicz
- Department of Medical Statistics, School of Public Health, Centre of Postgraduate Medical Education, Warsaw, Poland
| | - K Rasmussen
- Aalborg University Hospital, Aalborg, Denmark
| | - E Trinks-Roerdink
- Julius Center for Health Sciences and Primary Care, Department of General Practice, University Medical Center Utrecht, Utrecht, the Netherlands
| | | | - K Seddon
- Wales Cancer Research Centre, Cardiff, UK
| | - K Sexton
- Cardiff University, Cardiff, United Kingdom
| | - S Sivell
- Cardiff University, Cardiff, United Kingdom
| | - F Skjøth
- Aalborg University Hospital, Aalborg, Denmark
| | - M Søgaard
- Aalborg University Hospital, Aalborg, Denmark
| | - S Szmit
- Department of Cardio-Oncology, Centre of Postgraduate Medical Education, Warsaw, Poland
| | - S Trompet
- Department of Medicine - Internal Medicine and Geriatrics, Leiden University Medical Center, Leiden, the Netherlands
| | - P Vassal
- Department of Vascular and Therapeutical Medicine, University Hospital of Saint-Etienne, Saint-Étienne, France
| | - C Visser
- Department of Hematology, Erasmus MC, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - L M van Vliet
- Department of Health, Medicine and Neuropsychology, Leiden University, Leiden, the Netherlands
| | - E Wilson
- Wolfson Palliative Care Research Centre, Hull York Medical School, University of Hull, Hull, United Kingdom
| | - F A Klok
- Department of Medicine - Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands.
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9
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Baer A, Hoffmann I, Mahmoudi N, Poulhazan A, Harrington MJ, Mayer G, Schmidt S, Schneck E. The Internal Structure of the Velvet Worm Projectile Slime: A Small-Angle Scattering Study. Small 2023; 19:e2300516. [PMID: 36828797 DOI: 10.1002/smll.202300516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 02/03/2023] [Indexed: 06/02/2023]
Abstract
For prey capture and defense, velvet worms eject an adhesive slime which has been established as a model system for recyclable complex liquids. Triggered by mechanical agitation, the liquid bio-adhesive rapidly transitions into solid fibers. In order to understand this mechanoresponsive behavior, here, the nanostructural organization of slime components are studied using small-angle scattering with neutrons and X-rays. The scattering intensities are successfully described with a three-component model accounting for proteins of two dominant molecular weight fractions and nanoscale globules. In contrast to the previous assumption that high molecular weight proteins-the presumed building blocks of the fiber core-are contained in the nanoglobules, it is found that the majority of slime proteins exist freely in solution. Only less than 10% of the slime proteins are contained in the nanoglobules, necessitating a reassessment of their function in fiber formation. Comparing scattering data of slime re-hydrated with light and heavy water reveals that the majority of lipids in slime are contained in the nanoglobules with homogeneous distribution. Vibrating mechanical impact under exclusion of air neither leads to formation of fibers nor alters the bulk structure of slime significantly, suggesting that interfacial phenomena and directional shearing are required for fiber formation.
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Affiliation(s)
- Alexander Baer
- Department of Zoology, Institute of Biology, University of Kassel, D-34132, Kassel, Germany
| | - Ingo Hoffmann
- Spectroscopy Group, Institut Laue-Langevin, 38000, Grenoble, France
| | - Najet Mahmoudi
- Small-Angle Neutron Scattering Group, ISIS Neutron & Muon Source, STFC Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Alexandre Poulhazan
- Department of Chemistry, University of Quebec at Montreal, Montreal, QC, H2X 2J6, Canada
| | | | - Georg Mayer
- Department of Zoology, Institute of Biology, University of Kassel, D-34132, Kassel, Germany
| | - Stephan Schmidt
- Chemistry Department, Heinrich-Heine-Universität Düsseldorf, D-40225, Düsseldorf, Germany
| | - Emanuel Schneck
- Physics Department, Technische Universität Darmstadt, D-64289, Darmstadt, Germany
- Biomaterials Department, Max Planck Institute of Colloids and Interfaces, D-14476, Potsdam, Germany
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10
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Poirier A, Le Griel P, Hoffmann I, Perez J, Pernot P, Fresnais J, Baccile N. Ca 2+ and Ag + orient low-molecular weight amphiphile self-assembly into "nano-fishnet" fibrillar hydrogels with unusual β-sheet-like raft domains. Soft Matter 2023; 19:378-393. [PMID: 36562421 DOI: 10.1039/d2sm01218a] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Low-molecular weight gelators (LMWGs) are small molecules (Mw < ∼1 kDa), which form self-assembled fibrillar network (SAFiN) hydrogels in water when triggered by an external stimulus. A great majority of SAFiN gels involve an entangled network of self-assembled fibers, in analogy to a polymer in a good solvent. In some rare cases, a combination of attractive van der Waals and repulsive electrostatic forces drives the formation of bundles with a suprafibrillar hexagonal order. In this work, an unexpected micelle-to-fiber transition is triggered by Ca2+ or Ag+ ions added to a micellar solution of a novel glycolipid surfactant, whereas salt-induced fibrillation is not common for surfactants. The resulting SAFiN, which forms a hydrogel above 0.5 wt%, has a "nano-fishnet" structure, characterized by a fibrous network of both entangled fibers and β-sheet-like rafts, generally observed for silk fibroin, actin hydrogels or mineral imogolite nanotubes, but not known for SAFiNs. The β-sheet-like raft domains are characterized by a combination of cryo-TEM and SAXS and seem to contribute to the stability of glycolipid gels. Furthermore, glycolipid is obtained by fermentation from natural resources (glucose, rapeseed oil), thus showing that naturally engineered compounds can have unprecedented properties, when compared to the wide range of chemically derived amphiphiles.
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Affiliation(s)
- Alexandre Poirier
- Sorbonne Université, Centre National de la Recherche Scientifique, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, F-75005 Paris, France.
| | - Patrick Le Griel
- Sorbonne Université, Centre National de la Recherche Scientifique, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, F-75005 Paris, France.
| | | | - Javier Perez
- Synchrotron Soleil, L'Orme des Merisiers, Saint-Aubin, BP48, 91192 Gif-sur-Yvette Cedex, France
| | - Petra Pernot
- ESRF - The European Synchrotron, CS40220, 38043 Grenoble, France
| | - Jérôme Fresnais
- Sorbonne Université, CNRS, Laboratoire de Physico-chimie des Électrolytes et Nanosystèmes Interfaciaux, PHENIX - UMR 8234, F-75252, Paris Cedex 05, France
| | - Niki Baccile
- Sorbonne Université, Centre National de la Recherche Scientifique, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, F-75005 Paris, France.
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11
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Sharma A, Kruteva M, Allgaier J, Hoffmann I, Falus P, Monkenbusch M, Richter D. Chain Confinement and Anomalous Diffusion in the Cross over Regime between Rouse and Reptation. ACS Macro Lett 2022; 11:1343-1348. [PMID: 36409674 DOI: 10.1021/acsmacrolett.2c00608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
By neutron spin echo (NSE) and pulsed field gradient (PFG) NMR, we study the dynamics of a polyethylene-oxide melt (PEO) with a molecular weight in the transition regime between Rouse and reptation dynamics. We analyze the data with a Rouse mode analysis allowing for reduced long wavelength Rouse modes amplitudes. For short times, subdiffusive center-of-mass mean square displacement ⟨rcom2(t)⟩ was allowed. This approach captures the NSE data well and provides accurate information on the topological constraints in a chain length regime, where the tube model is inapplicable. As predicted by reptation for the polymer ⟨rcom2(t)⟩, we experimentally found the subdiffusive regime with an exponent close to μ=12, which, however, crosses over to Fickian diffusion not at the Rouse time, but at a later time, when the ⟨rcom2(t)⟩ has covered a distance related to the tube diameter.
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Affiliation(s)
- Aakash Sharma
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1: Neutron Scattering and Biological Matter), 52425Jülich, Germany
| | - Margarita Kruteva
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1: Neutron Scattering and Biological Matter), 52425Jülich, Germany
| | - Jürgen Allgaier
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1: Neutron Scattering and Biological Matter), 52425Jülich, Germany
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, Cedex 9, F-38042Grenoble, France
| | - Peter Falus
- Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, Cedex 9, F-38042Grenoble, France
| | - Michael Monkenbusch
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1: Neutron Scattering and Biological Matter), 52425Jülich, Germany
| | - Dieter Richter
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1: Neutron Scattering and Biological Matter), 52425Jülich, Germany
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12
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Kuzminskaya O, Riemer S, Dalgliesh R, Almásy L, Hoffmann I, Gradzielski M. Structure and Phase Behaviour of Interpolyelectrolyte Complexes of PDADMAC and Hydrophobically Modified PAA (HM‐PAA). MACROMOL CHEM PHYS 2022. [DOI: 10.1002/macp.202200276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Olga Kuzminskaya
- Stranski‐Laboratorium für Physikalische und Theoretische Chemie Institut für Chemie Technische Universität Berlin 10623 Berlin Germany
| | - Sven Riemer
- Stranski‐Laboratorium für Physikalische und Theoretische Chemie Institut für Chemie Technische Universität Berlin 10623 Berlin Germany
| | - Robert Dalgliesh
- ISIS Neutron and Muon Source Harwell Oxford Didcot OX11 0QX United Kingdom
| | - László Almásy
- Institute for Energy Security and Environmental Safety Centre for Energy Research Konkoly‐Thege Miklós út 29‐33 Budapest 1121 Hungary
| | - Ingo Hoffmann
- Institut Max von Laue‐Paul Langevin (ILL) Cedex 9 Grenoble F‐38042 France
| | - Michael Gradzielski
- Stranski‐Laboratorium für Physikalische und Theoretische Chemie Institut für Chemie Technische Universität Berlin 10623 Berlin Germany
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13
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Gréa C, Roser S, Hoffmann I, Storcksdieck genannt Bonsmann S. Nutritional composition of substitutes for meats and sausages on the German market. Eur J Public Health 2022. [DOI: 10.1093/eurpub/ckac131.236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Substitutes for meats and sausages are growing both in demand and supply in Germany. Monitoring their nutritional composition helps characterise this novel product group in terms of its dietary contribution.
Methods
Data on substitutes for meats and sausages were collected in a baseline survey in 2016 and an in-depth follow-up survey in 2021. In both surveys, mandatory nutrition declaration (“Big 7”) and other packaging information were collected via online research and supermarket visits. Products were categorised according to the substituted animal products and their contents of energy, fat, saturated fatty acids, and salt investigated. Changes in energy and nutrient contents between baseline and follow-up survey were assessed statistically using Welch’s t-test.
Results
The follow-up survey included 421 meat substitutes and 292 sausage substitutes, split into 27 subgroups. Substitutes for meat products like meat strips and schnitzel show widely varying energy contents. Sausage substitutes show higher medians for fat, saturated fatty acids and salt than meat substitutes; spans of salt content (0,1-4,0 g per 100 g product) and saturated fatty acids (0,1 g - 23,0 g per 100 g product) are particularly wide. Relative to the baseline survey, which included 69 meat substitutes and 61 sausage substitutes, the follow-up revealed significantly higher contents of energy and saturated fatty acids overall and in some subgroups (e.g. nuggets and burger patties). The sole significant reduction was seen for energy in substitutes of precooked sausages.
Conclusions
The observed wide spans of energy and nutrient content imply 1) the potential to reformulate substitutes for meats and sausages at the top end of the spectrum 2) the availability of healthier choices within the various subgroups. The increases shown in energy and saturated fatty acids content warrant further monitoring.
Key messages
• Wide spans of energy and nutrient contents reveal the potential for the development of more nutritionally favourable substitutes for meats and sausages.
• As substitutes for meats and sausages are perceived to have nutritional advantages the observed increases in energy and saturated fatty acids contents over time should be further monitored.
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Affiliation(s)
- C Gréa
- Nutritional Behaviour, Max Rubner-Institut , Karlsruhe, Germany
| | - S Roser
- Presidential Office, Max Rubner-Institut , Karlsruhe, Germany
| | - I Hoffmann
- Nutritional Behaviour, Max Rubner-Institut , Karlsruhe, Germany
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14
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Yalcinkaya H, Mangiapia G, Appavou MS, Hoffmann I, Gradzielski M. Polymeric Nanocapsules from Well-Defined Zwitanionic Vesicles as a Template. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hacer Yalcinkaya
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Strasse des 17 Juni, Sekr. TC7, D-10623 Berlin, Germany
- Evonik Operations GmbH, Goldschmidtstraße 100, 45127 Essen, Germany
| | - Gaetano Mangiapia
- German Engineering Materials Science (GEMS) at Heinz Maier-Leibnitz Zentrum (MLZ), Helmhotz-Zentrum Hereon, Lichtenbergstr. 1, 85748 Garching, Germany
| | - Marie-Sousai Appavou
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at MLZ, Lichtenbergstrasse 1, 85748 Garching, Germany
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL), F-38042 Grenoble Cedex 9, France
| | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Strasse des 17 Juni, Sekr. TC7, D-10623 Berlin, Germany
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15
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Chiappisi L, Hoffmann I, Gradzielski M. Membrane stiffening in Chitosan mediated multilamellar vesicles of alkyl ether carboxylates. J Colloid Interface Sci 2022; 627:160-167. [PMID: 35842966 DOI: 10.1016/j.jcis.2022.07.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 06/30/2022] [Accepted: 07/01/2022] [Indexed: 10/17/2022]
Abstract
HYPOTHESIS Membrane undulations are known to strongly affect the stability of uni- and multilamellar vesicles formed by surfactants or phospholipids. Herein, based on the same arguments, we hypothesise that the properties of polyelectrolyte mediated surfactant multilamellar vesicles, in particular the multiplicity - i.e. the number of layers forming the vesicle - depend on the dynamics of the membrane. EXPERIMENTS Small-angle neutron scattering (SANS) and neutron spin-echo (NSE) were used to probe the structure and the dynamics of the multilayered vesicles formed in mixtures of the biopolymer chitosan and oppositely charged alkyl ether carboxylates. The neutron scattering data are complemented by static and dynamic light scattering experiments. Experiments were performed in polyelectrolyte excess conditions, and at a pH close to the pKa of the surfactant. FINDINGS The structural investigation shows very clearly that multilayered surfactant/polyelectrolyte vesicles are formed in the investigated mixtures. Only 3 to 5 layers form, on average, one vesicle, as similarly found in mixtures of chitosan and phospholipid vesicles. NSE shows that the surfactant membrane becomes stiffer upon complexation with chitosan, and that the fluctuation of the layers is strongly coupled in time and space. Such strong coupling and the increase in overall stiffness is associated with a high entropic cost. Accordingly, the combined SANS and NSE study points out that the low multiplicity found in multilayered vesicles involving the rigid polysaccharide chitosan arises from the strongly coupled dynamics of the membrane layers.
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Affiliation(s)
- Leonardo Chiappisi
- Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Strasse des 17. Juni 124, Sekr. TC7, Technische Universität Berlin, D-10623 Berlin, Germany; Institut Max von Laue - Paul Langevin, 71 avenue des Martyrs 38042 Grenoble Cedex 9, France.
| | - Ingo Hoffmann
- Institut Max von Laue - Paul Langevin, 71 avenue des Martyrs 38042 Grenoble Cedex 9, France.
| | - Michael Gradzielski
- Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Strasse des 17. Juni 124, Sekr. TC7, Technische Universität Berlin, D-10623 Berlin, Germany.
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16
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Fanova A, Hoffmann I, Prévost S, Tošner Z, Štěpánek M. Insight into the Structure of a Comb Copolymer–Surfactant Coacervate from Dynamic Measurements by DOSY NMR and Neutron Spin Echo Spectroscopy. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anastasiia Fanova
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Sylvain Prévost
- Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Zdeněk Tošner
- NMR Laboratory, Faculty of Science, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic
| | - Miroslav Štěpánek
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic
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17
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Haris L, Biehl R, Dulle M, Radulescu A, Holderer O, Hoffmann I, Stadler AM. Variation of Structural and Dynamical Flexibility of Myelin Basic Protein in Response to Guanidinium Chloride. Int J Mol Sci 2022; 23:ijms23136969. [PMID: 35805997 PMCID: PMC9266411 DOI: 10.3390/ijms23136969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 06/18/2022] [Accepted: 06/21/2022] [Indexed: 11/16/2022] Open
Abstract
Myelin basic protein (MBP) is intrinsically disordered in solution and is considered as a conformationally flexible biomacromolecule. Here, we present a study on perturbation of MBP structure and dynamics by the denaturant guanidinium chloride (GndCl) using small-angle scattering and neutron spin–echo spectroscopy (NSE). A concentration of 0.2 M GndCl causes charge screening in MBP resulting in a compact, but still disordered protein conformation, while GndCl concentrations above 1 M lead to structural expansion and swelling of MBP. NSE data of MBP were analyzed using the Zimm model with internal friction (ZIF) and normal mode (NM) analysis. A significant contribution of internal friction was found in compact states of MBP that approaches a non-vanishing internal friction relaxation time of approximately 40 ns at high GndCl concentrations. NM analysis demonstrates that the relaxation rates of internal modes of MBP remain unaffected by GndCl, while structural expansion due to GndCl results in increased amplitudes of internal motions. Within the model of the Brownian oscillator our observations can be rationalized by a loss of friction within the protein due to structural expansion. Our study highlights the intimate coupling of structural and dynamical plasticity of MBP, and its fundamental difference to the behavior of ideal polymers in solution.
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Affiliation(s)
- Luman Haris
- Jülich Centre for Neutron Science (JCNS-1) and Institute of Biological Information Processing (IBI-8), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany; (L.H.); (R.B.); (M.D.)
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany
| | - Ralf Biehl
- Jülich Centre for Neutron Science (JCNS-1) and Institute of Biological Information Processing (IBI-8), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany; (L.H.); (R.B.); (M.D.)
| | - Martin Dulle
- Jülich Centre for Neutron Science (JCNS-1) and Institute of Biological Information Processing (IBI-8), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany; (L.H.); (R.B.); (M.D.)
| | - Aurel Radulescu
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungzentrum Jülich GmbH, 85747 Garching, Germany; (A.R.); (O.H.)
| | - Olaf Holderer
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungzentrum Jülich GmbH, 85747 Garching, Germany; (A.R.); (O.H.)
| | - Ingo Hoffmann
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, CEDEX 9, 38042 Grenoble, France;
| | - Andreas M. Stadler
- Jülich Centre for Neutron Science (JCNS-1) and Institute of Biological Information Processing (IBI-8), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany; (L.H.); (R.B.); (M.D.)
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany
- Correspondence:
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18
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Abstract
Here, we determine by neutron spin echo spectrometry (NSE) how the flexibility of egg lecithin vesicles depends on solvent composition in two protic ionic liquids (PILs) and their aqueous mixtures. In combination with small-angle neutron scattering (SANS), dynamic light scattering (DLS), and fluorescent probe microscopy, we show that the bending modulus is up to an order of magnitude lower than in water but with no change in bilayer thickness or nonpolar chain composition. This effect is attributed to the dynamic association and exchange of the IL cation between the membrane and bulk liquid, which has the same origin as the underlying amphiphilic nanostructure of the IL solvent itself. This provides a new mechanism by which to tune and control lipid membrane behavior.
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Affiliation(s)
- Shurui Miao
- School of Chemistry and University of Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, Cedex 9, F-38042 Grenoble, France
| | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany
| | - Gregory G Warr
- School of Chemistry and University of Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
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19
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Del Sorbo GR, Clemens D, Schneck E, Hoffmann I. Stimuli-responsive polyelectrolyte surfactant complexes for the reversible control of solution viscosity. Soft Matter 2022; 18:2434-2440. [PMID: 35274665 DOI: 10.1039/d1sm01774h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Interactions of polyelectrolytes with oppositely charged surfactants can give rise to a large variety of self-assembled structures. Some of these systems cause a drastic increase in solution viscosity, which is related to the surfactant forming aggregates interconnecting several polyelectrolyte chains. For these aggregates to form, the surfactant needs to be sufficiently hydrophobic. Here, we present a system consisting of the anionic surfactant sodium monododecyl phosphate and the cationic cellulose-based polyelectrolyte JR 400. The hydrophobicity of the surfactant can be controlled by the solution's pH. At pH > 12, the surfactant headgroup bears two charges. As a consequence, the solution viscosity decreases drastically by up to two orders of magnitude, while it can be as high as 10 Pa s at lower pH. In this paper, we investigate the changes of the mesoscopic structure of the system which lead to such drastic changes in viscosity using small angle neutron scattering and neutron spin-echo spectroscopy. Such systems are potentially interesting as they allow for a modular design where stimuli responsiveness is introduced by relatively small amounts of surfactant reusing the same simple polyelectrolyte.
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Affiliation(s)
- Giuseppe Rosario Del Sorbo
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476 Potsdam, Germany
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France.
| | - Daniel Clemens
- Helmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, D-14109, Berlin, Germany
| | - Emanuel Schneck
- Department of Physics, Technische Universität Darmstadt, Hochschulstraße 8, D-64289 Darmstadt, Germany.
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France.
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20
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Santamaria A, Batchu KC, Matsarskaia O, Prévost SF, Russo D, Natali F, Seydel T, Hoffmann I, Laux V, Haertlein M, Darwish TA, Russell RA, Corucci G, Fragneto G, Maestro A, Zaccai NR. Strikingly Different Roles of SARS-CoV-2 Fusion Peptides Uncovered by Neutron Scattering. J Am Chem Soc 2022; 144:2968-2979. [PMID: 35157798 PMCID: PMC8862744 DOI: 10.1021/jacs.1c09856] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Indexed: 02/02/2023]
Abstract
Coronavirus disease-2019 (COVID-19), a potentially lethal respiratory illness caused by the coronavirus SARS-CoV-2, emerged in the end of 2019 and has since spread aggressively across the globe. A thorough understanding of the molecular mechanisms of cellular infection by coronaviruses is therefore of utmost importance. A critical stage in infection is the fusion between viral and host membranes. Here, we present a detailed investigation of the role of selected SARS-CoV-2 Spike fusion peptides, and the influence of calcium and cholesterol, in this fusion process. Structural information from specular neutron reflectometry and small angle neutron scattering, complemented by dynamics information from quasi-elastic and spin-echo neutron spectroscopy, revealed strikingly different functions encoded in the Spike fusion domain. Calcium drives the N-terminal of the Spike fusion domain to fully cross the host plasma membrane. Removing calcium, however, reorients the peptide back to the lipid leaflet closest to the virus, leading to significant changes in lipid fluidity and rigidity. In conjunction with other regions of the fusion domain, which are also positioned to bridge and dehydrate viral and host membranes, the molecular events leading to cell entry by SARS-CoV-2 are proposed.
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Affiliation(s)
- Andreas Santamaria
- Institut
Laue-Langevin, 38042 Grenoble, France
- Departamento
de Química Física, Universidad
Complutense de Madrid, 28040 Madrid, Spain
| | | | | | | | - Daniela Russo
- Institut
Laue-Langevin, 38042 Grenoble, France
- CNR-IOM
& INSIDE@ILL, 38042 Grenoble, France
| | - Francesca Natali
- Institut
Laue-Langevin, 38042 Grenoble, France
- CNR-IOM
& INSIDE@ILL, 38042 Grenoble, France
| | - Tilo Seydel
- Institut
Laue-Langevin, 38042 Grenoble, France
| | | | | | | | - Tamim A. Darwish
- National
Deuteration Facility, ANSTO-Sidney, Lucas Heights, NSW 2234, Australia
| | - Robert A. Russell
- National
Deuteration Facility, ANSTO-Sidney, Lucas Heights, NSW 2234, Australia
| | - Giacomo Corucci
- Institut
Laue-Langevin, 38042 Grenoble, France
- École
Doctorale de Physique, Université
Grenoble Alpes, 38400 Saint-Martin-d’Héres, France
| | - Giovanna Fragneto
- Institut
Laue-Langevin, 38042 Grenoble, France
- École
Doctorale de Physique, Université
Grenoble Alpes, 38400 Saint-Martin-d’Héres, France
| | - Armando Maestro
- Institut
Laue-Langevin, 38042 Grenoble, France
- Centro
de Física de Materiales (CSIC, UPV/EHU) − Materials
Physics Center MPC, Paseo
Manuel de Lardizabal 5, E-20018 San Sebastián, Spain
- IKERBASQUE
− Basque Foundation for Science, Plaza Euskadi 5, E-48009 Bilbao, Spain
| | - Nathan R. Zaccai
- Cambridge
Institute for Medical Research, University
of Cambridge, Cambridge CB22 7QQ, United Kingdom
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21
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Malo de Molina P, Alegría A, Allgaier J, Kruteva M, Hoffmann I, Prévost S, Monkenbusch M, Richter D, Arbe A, Colmenero J. The combination of neutron spin echo and dielectric spectroscopy to examine tube dilation. EPJ Web Conf 2022. [DOI: 10.1051/epjconf/202227201001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The polymer dynamics in blends of long and short chains spans several decades in time and the understanding of the effect of the short chains on the relaxation mechanism of the long chains due to constraint release requires the combination of microscopic and macroscopic techniques. While the longtime dynamics can be accessed by mechanical or dielectric spectroscopy (DS), its relation to the microstructural details requires the application of theoretical models. In contrast, neutron spin echo (NSE) measures directly the dynamic structure factor reflecting the process of constraint removal at the molecular scale. Here the comparison of NSE and DS results in a model blend of short and long polyisoprene enables the exploration of the entire time regime showing that constraint release leads to a dilation of the confining tube. We show the description of the dynamic tube dilation using a simple model in which the time controlling the tube dilation for the long chain is the terminal time of the short chain.
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22
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Hoffmann I, Malayil Kalathil F, Lopian T, Touraud D, Czakkel O, Plazanet M, Alba-Simionesco C. Unexpected molecular dynamics of ethanol in hydrogen-bonded binary mixtures, ethanol-octanol and ethanol-water. EPJ Web Conf 2022. [DOI: 10.1051/epjconf/202227201003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In view of getting a quantitative picture of the dynamics in mixtures of hydrogen-bonded liquids, in particular the ternary water-ethanol-octanol, we examine in this paper the dynamics of two binary systems: ethanol-water and ethanol-octanol. Our multiscale investigation includes quasi-elastic neutron scattering for the characterization of the dynamics at the molecular scale, completed by NMR at the mesoscopic scale and eventually compared with macroscopic viscosity properties. We highlight the decrease of diffusivity in pure alcohols when increasing the lengthscale and conjecture its relation with the two processes measured in dielectric spectroscopy. While the behaviour of ethanol-water is well understood, unexpected inversion of the slowest component between the micro and the mesoscale are evidenced in the ethanol-octanol mixture. This effect could be at the origin of the negative viscosity excess in the mixture of alcohols.
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23
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Kruteva M, Zamponi M, Hoffmann I, Allgaier J, Monkenbusch M, Richter D. Non-Gaussian and Cooperative Dynamics of Entanglement Strands in Polymer Melts. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01859] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Margarita Kruteva
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1: Neutron Scattering and Biological Matter), 52425 Jülich, Germany
| | - Michaela Zamponi
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ, Lichtenbergstraße 1, 85748 Garching, Germany
| | - Ingo Hoffmann
- Institut Laue-Langevin (ILL), B.P. 156, F-38042 Grenoble Cedex 9, France
| | - Jürgen Allgaier
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1: Neutron Scattering and Biological Matter), 52425 Jülich, Germany
| | - Michael Monkenbusch
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1: Neutron Scattering and Biological Matter), 52425 Jülich, Germany
| | - Dieter Richter
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1: Neutron Scattering and Biological Matter), 52425 Jülich, Germany
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24
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25
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Kuzminskaya O, Hoffmann I, Clemens D, Gradzielski M. Viscosity of Polyelectrolyte Surfactant Complexes—The Importance of the Choice of the Polyelectrolyte Seen for the Case of PDADMAC Versus JR 400. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00327] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Olga Kuzminskaya
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC 7, D-10623 Berlin, Germany
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL), F-38042 Grenoble Cedex 9, France
| | | | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC 7, D-10623 Berlin, Germany
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26
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Zamponi M, Kruteva M, Monkenbusch M, Willner L, Wischnewski A, Hoffmann I, Richter D. Cooperative Chain Dynamics of Tracer Chains in Highly Entangled Polyethylene Melts. Phys Rev Lett 2021; 126:187801. [PMID: 34018790 DOI: 10.1103/physrevlett.126.187801] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Accepted: 03/12/2021] [Indexed: 06/12/2023]
Abstract
By neutron spin echo spectroscopy, we have studied the center of mass motion of short tracer chains on the molecular length scale within a highly entangled polymer matrix. The center of mass mean square displacements of the tracers independent of their molecular weight is subdiffusive at short times until it has reached the size of the tube d; then, a crossover to Fickian diffusion takes place. This observation cannot be understood within the tube model of reptation, but is rationalized as a result of important interchain couplings that lead to cooperative chain motion within the entanglement volume ∼d^{3}. Thus, the cooperative tracer chain motions are limited by the tube size d. If the center of mass displacement exceeds this size, uncorrelated Fickian diffusion takes over. Compared to the prediction of the Rouse model we observe a significantly reduced contribution of the tracer's internal modes to the spectra corroborating the finding of cooperative rather than Rouse dynamics within d^{3}.
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Affiliation(s)
- M Zamponi
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ, Lichtenbergstraße 1, 85748 Garching, Germany
| | - M Kruteva
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1) and Institute for Complex Systems (ICS-1), 52425 Jülich, Germany
| | - M Monkenbusch
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1) and Institute for Complex Systems (ICS-1), 52425 Jülich, Germany
| | - L Willner
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1) and Institute for Complex Systems (ICS-1), 52425 Jülich, Germany
| | - A Wischnewski
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1) and Institute for Complex Systems (ICS-1), 52425 Jülich, Germany
| | - I Hoffmann
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38000 Grenoble, France
| | - D Richter
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1) and Institute for Complex Systems (ICS-1), 52425 Jülich, Germany
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27
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Martin-Fabiani I, Drakopoulos SX, Forte G, Prévost S, Hoffmann I, Ronca S. Chain Dynamics of Ultrahigh Molecular Weight Polyethylene Composites with Graphene Oxide Nanosheets. ACS Macro Lett 2021; 10:460-465. [PMID: 35549228 DOI: 10.1021/acsmacrolett.1c00007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We investigate the melt chain dynamics of ultrahigh molecular weight polyethylene (UHMWPE) and its composites with graphene oxide (GO) nanosheets by means of neutron spin echo spectroscopy. For the GO concentrations explored, we observe hindered chain dynamics with respect to the pure UHMWPE. We propose a model where a fraction of the polymer is immobilized on top and at the bottom of GO sheets. This model enables us to provide a microscopic measurement of the adsorbed and free polymer fractions, as well as the thickness of the adsorbed layer. Our experiments provide experimental nanoscopic evidence of GO hindering entanglement formation in a polymer melt, a phenomenon that had been observed at the macroscale before via rheological measurements.
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Affiliation(s)
- Ignacio Martin-Fabiani
- Department of Materials, Loughborough University, Loughborough, Leicestershire LE11 3TU, U.K
| | - Stavros X. Drakopoulos
- School of Metallurgy and Materials, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - Giuseppe Forte
- Department of Materials, Loughborough University, Loughborough, Leicestershire LE11 3TU, U.K
| | - Sylvain Prévost
- Institut Max von Laue-Paul Langevin (ILL), F-38042 Grenoble Cedex 9, France
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL), F-38042 Grenoble Cedex 9, France
| | - Sara Ronca
- Department of Materials, Loughborough University, Loughborough, Leicestershire LE11 3TU, U.K
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28
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Del Sorbo GR, Cristiglio V, Clemens D, Hoffmann I, Schneck E. Influence of the Surfactant Tail Length on the Viscosity of Oppositely Charged Polyelectrolyte/Surfactant Complexes. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c02728] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Giuseppe Rosario Del Sorbo
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476 Potsdam, Germany
- Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Viviana Cristiglio
- Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Daniel Clemens
- Helmholtz Zentrum Berlin, Hahn-Meitner Platz 1, D-14109 Berlin, Germany
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Emanuel Schneck
- Department of Physics, Technische Universität Darmstadt, Hochschulstraße 8, D-64289 Darmstadt, Germany
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29
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Bekir M, Hörmann A, Brückner C, Hoffmann I, Prévost S, Gradzielski M. Adsorption Kinetics of Oppositely Charged Hard and Soft Nanoparticles with Phospholipid Membranes. Langmuir 2021; 37:2800-2809. [PMID: 33606547 DOI: 10.1021/acs.langmuir.0c03553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Nanoparticles (NPs) have great potential for biological applications as typically they exhibit strongly size-dependent properties. Specifically, the interaction of NPs with phospholipid membranes is significantly relevant to nanomedicine and the related field of nanotoxicology. Therefore, the investigation of interactions of NPs with model membranes is not only fundamentally important but also practically valuable to understand interactions of NPs with more complex cell membranes. Here, we report on the interaction of anionic vesicles of different charge densities and cationic SiO2 NPs, either covered by a bare surface functionalized with amino moieties (-NH2) or covered by poly[2-(dimethylamino) ethyl methacrylate]. We studied the kinetics of binding of NPs to the vesicle surface by time-resolved scattering experiments. A key result of the study is that binding is favored in the presence of electrostatic attraction, but the polymer layer decreases the binding rate drastically.
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Affiliation(s)
- Marek Bekir
- Stranski Laboratorium für Physikalische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Anja Hörmann
- Stranski Laboratorium für Physikalische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Christoph Brückner
- Stranski Laboratorium für Physikalische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Ingo Hoffmann
- Stranski Laboratorium für Physikalische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Sylvain Prévost
- Stranski Laboratorium für Physikalische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
- European Synchrotron Radiation Facility (ESRF), avenue des Martyrs, CS 40220, 38043 Grenoble, Cedex 9, France
| | - Michael Gradzielski
- Stranski Laboratorium für Physikalische Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
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30
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Abstract
We discuss the complex interplay between host and guest dynamics for a polymer in soft confinement by a droplet-phase microemulsion. Intermediate scattering functions obtained by neutron spin echo spectroscopy are first analysed by means of an effective diffusion coefficient. From its dependence on the absolute of the scattering vector q we concluded a sophisticated model for the systems dynamics taking both polymer and microemulsion contributions into account. Global fitting of this model to the intermediate scattering functions at all measured q-values and all investigated confinement sizes eventually allows for a precise disentangling of the pure polymer dynamics in confinement from the overlaying microemulsion dynamics. Validity of our approach is further supported by numerical random walk calculations.
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Affiliation(s)
- Björn Kuttich
- Experimental Condensed Matter Physics, TU Darmstadt, Germany
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31
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Kruteva M, Monkenbusch M, Allgaier J, Holderer O, Pasini S, Hoffmann I, Richter D. Self-Similar Dynamics of Large Polymer Rings: A Neutron Spin Echo Study. Phys Rev Lett 2020; 125:238004. [PMID: 33337173 DOI: 10.1103/physrevlett.125.238004] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 09/29/2020] [Indexed: 06/12/2023]
Abstract
This work clarifies the self-similar dynamics of large polymer rings using pulsed-field gradient nuclear magnetic resonance and neutron spin echo spectroscopy. We find center of mass diffusion taking place in three dynamic regimes starting (i) with a strongly subdiffusive domain ⟨r^{2}(t)⟩_{com}∼t^{α} (0.4≤α≤0.65); (ii) a second subdiffusive region ⟨r^{2}(t)⟩_{com}∼t^{0.75} that (iii) finally crosses over to Fickian diffusion. While the t^{0.75} range previously has been found in simulations and was predicted by theory, we attribute the first to the effect of cooperative dynamics resulting from the correlation hole potential. The internal dynamics at scales below the elementary loop size is well described by ring Rouse motion. At larger scales the dynamics is self-similar and follows very well the predictions of the scaling models with preference for the self-consistent fractal loopy globule model.
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Affiliation(s)
- M Kruteva
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS), 52425 Jülich, Germany
| | - M Monkenbusch
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS), 52425 Jülich, Germany
| | - J Allgaier
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS), 52425 Jülich, Germany
| | - O Holderer
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ, Lichtenbergstraße 1, 85748 Garching, Germany
| | - S Pasini
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ, Lichtenbergstraße 1, 85748 Garching, Germany
| | - I Hoffmann
- Institut Laue-Langevin (ILL), 71 avenue des Martyrs, 38000 Grenoble, France
| | - D Richter
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS), 52425 Jülich, Germany
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32
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Gruenewald T, Pellissier V, Philipp E, Wolfensteller K, Hoffmann I, Zabel R, Ackermann G, Pöge A, Linde J, Lakowa N. Antimicrobial resistance in Helicobacter pylori – State-wide surveillance from the Saxony antibiotic network project (ABNW). Int J Infect Dis 2020. [DOI: 10.1016/j.ijid.2020.09.063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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33
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Lakowa N, Pellissier V, Ackermann G, Zabel R, Hoffmann I, Philipp E, Wolfensteller K, Pöge A, Linde J, Gruenewald T. Antimicrobial resistance to rescue substances in Gram-negative ESKAPE pathogens – State-wide surveillance from the Saxony antibiotic network project. Int J Infect Dis 2020. [DOI: 10.1016/j.ijid.2020.09.205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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34
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Simon M, Gradzielski M, Hoffmann I. Dynamics in polyelectrolyte/microemulsion complexes. Nanoscale Adv 2020; 2:4722-4727. [PMID: 36132920 PMCID: PMC9419170 DOI: 10.1039/d0na00336k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 08/20/2020] [Indexed: 06/16/2023]
Abstract
Oil-in-water (O/W) microemulsion droplets are convenient carriers for hydrophobic molecules in an aqueous phase and are used for a wide range of applications. We studied weakly charged O/W microemulsion droplets complexed with oppositely charged polyacrylates that form long linear arrangements of droplets. All samples showed rather low viscosities, which is in contrast to similar systems of hydrophobically interconnected droplets. Here, we applied small-angle neutron scattering, dynamic light scattering and neutron spin-echo spectroscopy to characterise the dynamic properties of polyacrylate/microemulsion complexes in order to understand the origin of the low-viscous behaviour. We found that the electrostatic interactions lead to very dynamic complexes with high exchange rates of droplets and only a fraction of the droplets is contained within the transient complexes at a given time. These results were only accessible by the combination of different methods as one method alone would have given an incomplete picture.
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Affiliation(s)
- Miriam Simon
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin Straße des 17. Juni 124, Sekr. TC 7 D-10623 Berlin Germany
| | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin Straße des 17. Juni 124, Sekr. TC 7 D-10623 Berlin Germany
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL) 71 avenue des Martyrs, CS 20156 F-38042 Grenoble Cedex 9 France
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35
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Keckstein P, Fattahi A, Liverani L, Dittrich R, Hoffmann I, Boccaccini AR, Beckmann MW, Bleisinger N. Fertilitätserhalt: Optimierung der Follikelextraktion vor Kultivierung im künstlichen Ovar. Geburtshilfe Frauenheilkd 2020. [DOI: 10.1055/s-0040-1717705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- P Keckstein
- Frauenklinik des Universitätsklinikums Erlangen der Friedrich-Alexander-Universität Erlangen-Nürnberg, Gynäkologische Endokrinologie und Reproduktionsmedizin
| | - A Fattahi
- Frauenklinik des Universitätsklinikums Erlangen der Friedrich-Alexander-Universität Erlangen-Nürnberg, Gynäkologische Endokrinologie und Reproduktionsmedizin
- Tabriz University of Medical Sciences, Women’s Reproductive Health Research Center, Tabriz
| | - L Liverani
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Department Werkstoffwissenschaften, Lehrstuhl für Biomaterialien
| | - R Dittrich
- Frauenklinik des Universitätsklinikums Erlangen der Friedrich-Alexander-Universität Erlangen-Nürnberg, Gynäkologische Endokrinologie und Reproduktionsmedizin
| | - I Hoffmann
- Frauenklinik des Universitätsklinikums Erlangen der Friedrich-Alexander-Universität Erlangen-Nürnberg, Gynäkologische Endokrinologie und Reproduktionsmedizin
| | - AR Boccaccini
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Department Werkstoffwissenschaften, Lehrstuhl für Biomaterialien
| | - MW Beckmann
- Frauenklinik des Universitätsklinikums Erlangen der Friedrich-Alexander-Universität Erlangen-Nürnberg, Gynäkologische Endokrinologie und Reproduktionsmedizin
| | - N Bleisinger
- Frauenklinik des Universitätsklinikums Erlangen der Friedrich-Alexander-Universität Erlangen-Nürnberg, Gynäkologische Endokrinologie und Reproduktionsmedizin
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36
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Buchold P, Ram-On M, Talmon Y, Hoffmann I, Schweins R, Gradzielski M. Uncommon Structures of Oppositely Charged Hyaluronan/Surfactant Assemblies under Physiological Conditions. Biomacromolecules 2020; 21:3498-3511. [PMID: 32786536 DOI: 10.1021/acs.biomac.0c00221] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Self-assembled aggregates formed by semidilute polyanion hyaluronan (hyaluronic acid, HA) and an oppositely charged surfactant tetradecyltrimethylammonium bromide (TTAB) in an aqueous phosphate-buffered saline (PBS) solution have been studied via light scattering (LS), small-angle neutron scattering (SANS), and cryogenic transmission electron microscopy (cryo-TEM). The addition of 0-20 mM TTAB to a 27.7 mM (monomer, 1 wt %) HA solution (597 kDa) in PBS buffer leads to soluble complexes until phase separation occurs near charge equilibrium (>20 mM TTAB). While the viscosity remains rather constant, already small amounts of added TTAB lead to the formation of large globular superstructures, which are built in a hierarchical fashion from a locally threadlike structural arrangement of TTA micelles along the stiff HA chains, within the little changed HA network. These globular domains have radii of 60-100 nm and contain 500-700 TTA micelles, which means that they are very "fluffy" and composed of about 99% water. They do not grow in size or number upon further TTAB addition, but, instead, the additional TTA micelles form further threadlike complexes outside of the big globular domains. Such a type of polyelectrolyte-surfactant complexes (PESCs) has not been described before and has to be attributed to the particular properties of HA, which are high stiffness and relatively weak interactions with oppositely charged micelles due to having the charged carboxylic group close to the polysaccharide backbone. These findings demonstrate that the HA network structure in solution basically remains unaffected by complexation with an oppositely charged surfactant, explaining the unchanged rheological behavior and the formation of a unique PESC local "coacervate" structure within the HA hydrogel network.
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Affiliation(s)
- Philipp Buchold
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, D-10623 Berlin, Germany.,Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, CS 20 156, F-38042 Grenoble Cedex 9, France
| | - Maor Ram-On
- Department of Chemical Engineering and The Russell Berrie Nanotechnology Institute (RBNI), Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Yeshayahu Talmon
- Department of Chemical Engineering and The Russell Berrie Nanotechnology Institute (RBNI), Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Ingo Hoffmann
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, CS 20 156, F-38042 Grenoble Cedex 9, France
| | - Ralf Schweins
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, CS 20 156, F-38042 Grenoble Cedex 9, France
| | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, D-10623 Berlin, Germany
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37
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Malo de Molina P, Alegría A, Allgaier J, Kruteva M, Hoffmann I, Prévost S, Monkenbusch M, Richter D, Arbe A, Colmenero J. Tube Dilation in Isofrictional Polymer Blends Based on Polyisoprene with Different Topologies: Combination of Dielectric and Rheological Spectroscopy, Pulsed-Field-Gradient NMR, and Neutron Spin Echo (NSE) Techniques. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paula Malo de Molina
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain
- Materials Physics Center (MPC), Centro de Fı́sica de Materiales (CFM) (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
- IKERBASQUE-Basque Foundation for Science, María Díaz de Haro 3, 48013 Bilbao, Spain
| | - Angel Alegría
- Materials Physics Center (MPC), Centro de Fı́sica de Materiales (CFM) (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
- Departamento de Fı́sica de Materiales (UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain
| | | | | | - Ingo Hoffmann
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Sylvain Prévost
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | | | | | - Arantxa Arbe
- Materials Physics Center (MPC), Centro de Fı́sica de Materiales (CFM) (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
| | - Juan Colmenero
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain
- Materials Physics Center (MPC), Centro de Fı́sica de Materiales (CFM) (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
- Departamento de Fı́sica de Materiales (UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain
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38
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Lotz L, Hoffmann I, Beckmann MW, Dittrich R. Kryokonservierung von Ovarialgewebe bei Patientinnen mit Ullrich Turner Syndrom im Rahmen des Fertilitätserhaltes. Geburtshilfe Frauenheilkd 2020. [DOI: 10.1055/s-0040-1714012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- L Lotz
- Frauenklinik, Universitätsklinikum Erlangen
| | - I Hoffmann
- Frauenklinik, Universitätsklinikum Erlangen
| | | | - R Dittrich
- Frauenklinik, Universitätsklinikum Erlangen
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Del Sorbo GR, Prévost S, Schneck E, Gradzielski M, Hoffmann I. On the Mechanism of Shear-Thinning in Viscous Oppositely Charged Polyelectrolyte Surfactant Complexes (PESCs). J Phys Chem B 2020; 124:909-913. [PMID: 31935087 DOI: 10.1021/acs.jpcb.9b10467] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Semidilute mixtures of the cationically modified cellulose-based polyelectrolyte JR 400 and the anionic surfactant sodium dodecyl sulfate (SDS) form highly viscous solutions if a slight excess of charges from the polyelectrolyte is present. The reason for this is the formation of mixed rodlike aggregates in which the surfactant cross-links several polyelectrolyte chains. The same solutions also show shear-thinning behavior. In this paper, we use rheoSANS to investigate the structural evolution of the rodlike aggregates under steady shear and thereby elucidate the mechanism of shear-thinning in these viscous oppositely charged polyelectrolyte surfactant complexes.
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Affiliation(s)
- Giuseppe Rosario Del Sorbo
- Max Planck Institute of Colloids and Interfaces , Am Mühlenberg 1 , 14476 Potsdam , Germany.,Institut Max von Laue-Paul Langevin (ILL) , 71 avenue des Martyrs, CS 20156 , F-38042 Grenoble Cedex 9, France
| | - Sylvain Prévost
- Institut Max von Laue-Paul Langevin (ILL) , 71 avenue des Martyrs, CS 20156 , F-38042 Grenoble Cedex 9, France
| | - Emanuel Schneck
- Max Planck Institute of Colloids and Interfaces , Am Mühlenberg 1 , 14476 Potsdam , Germany.,Soft Matter Biophysics, Department of Physics , TU Darmstadt , Hochschulstraße 8 , D-64289 Darmstadt , Germany
| | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie , Institut für Chemie, Technische Universität Berlin , Straße des 17. Juni 124, Sekr. TC 7 , D-10623 Berlin , Germany
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL) , 71 avenue des Martyrs, CS 20156 , F-38042 Grenoble Cedex 9, France
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40
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Malo de Molina P, Alegría A, Allgaier J, Kruteva M, Hoffmann I, Prévost S, Monkenbusch M, Richter D, Arbe A, Colmenero J. Direct Observation of Dynamic Tube Dilation in Entangled Polymer Blends: A Combination of Neutron Scattering and Dielectric Techniques. Phys Rev Lett 2019; 123:187802. [PMID: 31763907 DOI: 10.1103/physrevlett.123.187802] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Revised: 07/10/2019] [Indexed: 06/10/2023]
Abstract
We report a microscopic observation of the time-dependent dynamic tube dilation process on isofrictional bidisperse melts. By applying neutron spin echo (NSE) and dielectric techniques on blends of long polyisoprene (PI) chains with short PI additives with different topology, we access the dynamics of the tube dilation process on a molecular scale. The time-dependent tube dilation is directly revealed by NSE as an additional time dependence of the dynamic structure factor in the local reptation regime. We identify the characteristic time of tube dilation as the terminal time of the additive.
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Affiliation(s)
- Paula Malo de Molina
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain
- Centro de Física de Materiales (CFM) (CSIC-UPV/EHU)-Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
- IKERBASQUE - Basque Foundation for Science, María Díaz de Haro 3, 48013 Bilbao, Spain
| | - Angel Alegría
- Centro de Física de Materiales (CFM) (CSIC-UPV/EHU)-Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
- Departamento de Física de Materiales (UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain
| | - Jürgen Allgaier
- Jülich Centre for Neutron Science JCNS-1, Forschungszentrum Jülich GmbH, Leo Brandt Straße, 52425 Jülich, Germany
| | - Margarita Kruteva
- Jülich Centre for Neutron Science JCNS-1, Forschungszentrum Jülich GmbH, Leo Brandt Straße, 52425 Jülich, Germany
| | - Ingo Hoffmann
- Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France
| | - Sylvain Prévost
- Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France
| | - Michael Monkenbusch
- Jülich Centre for Neutron Science JCNS-1, Forschungszentrum Jülich GmbH, Leo Brandt Straße, 52425 Jülich, Germany
| | - Dieter Richter
- Jülich Centre for Neutron Science JCNS-1, Forschungszentrum Jülich GmbH, Leo Brandt Straße, 52425 Jülich, Germany
| | - Arantxa Arbe
- Centro de Física de Materiales (CFM) (CSIC-UPV/EHU)-Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
| | - Juan Colmenero
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain
- Centro de Física de Materiales (CFM) (CSIC-UPV/EHU)-Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
- Departamento de Física de Materiales (UPV/EHU), Apartado 1072, 20080 San Sebastián, Spain
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41
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Affiliation(s)
- I. Hoffmann
- Animal Production Service of the Food and Agriculture Organization (FAO), Rome, Italy
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42
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Hoffmann I, Simon M, Bleuel M, Falus P, Gradzielski M. Structure, Dynamics, and Composition of Large Clusters in Polyelectrolyte–Surfactant Systems. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02611] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ingo Hoffmann
- Institut Max von
Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, Cedex 9, F-38042 Grenoble, France
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC 7, D-10623 Berlin, Germany
| | - Miriam Simon
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC 7, D-10623 Berlin, Germany
| | - Markus Bleuel
- NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, United States
| | - Peter Falus
- Institut Max von
Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, Cedex 9, F-38042 Grenoble, France
| | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC 7, D-10623 Berlin, Germany
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43
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Gold BJ, Pyckhout-Hintzen W, Wischnewski A, Radulescu A, Monkenbusch M, Allgaier J, Hoffmann I, Parisi D, Vlassopoulos D, Richter D. Direct Assessment of Tube Dilation in Entangled Polymers. Phys Rev Lett 2019; 122:088001. [PMID: 30932610 DOI: 10.1103/physrevlett.122.088001] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Indexed: 06/09/2023]
Abstract
A key ingredient within theories focusing on the rheology of entangled polymers is the way how the topological constraints of an entangled chain are lifted by unconstrained segments, i.e., how the constraining tube is dilated. This important question has been addressed by directly measuring the tube diameter d at the scale of the tube by neutron spin echo spectroscopy. The tube diameter d and plateau modulus G_{N}^{0} of highly entangled polyethylene oxide (PEO) chains of volume fraction c that are diluted by low molecular PEO show a concentration dependence d∝c^{a/2} and G_{N}^{0}∝c^{1+a} with an exponent a close to 4/3. This result allows the clear discrimination between different theoretical models that predict 4/3 or other values between 1 and 2 and provides an important ingredient to tube model theories.
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Affiliation(s)
- B J Gold
- Jülich Centre for Neutron Science (JCNS) and Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - W Pyckhout-Hintzen
- Jülich Centre for Neutron Science (JCNS) and Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - A Wischnewski
- Jülich Centre for Neutron Science (JCNS) and Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - A Radulescu
- Jülich Centre for Neutron Science (JCNS) at Maier Leibnitz-Zentrum, Forschungszentrum Jülich GmbH, 85747 Garching, Germany
| | - M Monkenbusch
- Jülich Centre for Neutron Science (JCNS) and Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - J Allgaier
- Jülich Centre for Neutron Science (JCNS) and Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - I Hoffmann
- Institute Laue Langevin (ILL), 3800 Grenoble, France
| | - D Parisi
- Institute of Electronic Structure and Laser, FORTH, 70013 Heraklion, Crete, Greece and Department of Materials Science and Technology, University of Crete, 70013 Heraklion, Crete, Greece
- Department of Materials Science and Technology, University of Crete, 70013 Heraklion, Crete, Greece
| | - D Vlassopoulos
- Institute of Electronic Structure and Laser, FORTH, 70013 Heraklion, Crete, Greece and Department of Materials Science and Technology, University of Crete, 70013 Heraklion, Crete, Greece
- Department of Materials Science and Technology, University of Crete, 70013 Heraklion, Crete, Greece
| | - D Richter
- Jülich Centre for Neutron Science (JCNS) and Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
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44
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Kitiri EN, Varnava CK, Patrickios CS, Voutouri C, Stylianopoulos T, Gradzielski M, Hoffmann I. Double‐networks based on interconnected amphiphilic “in–out” star first polymer conetworks prepared by RAFT polymerization. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/pola.29176] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Elina N. Kitiri
- Department of ChemistryUniversity of Cyprus P. O. Box 20537, 1678 Nicosia Cyprus
| | | | - Costas S. Patrickios
- Department of ChemistryUniversity of Cyprus P. O. Box 20537, 1678 Nicosia Cyprus
| | - Chrysovalantis Voutouri
- Department of Mechanical and Manufacturing EngineeringUniversity of Cyprus P. O. Box 20537, Nicosia 1678 Cyprus
| | | | - Michael Gradzielski
- Stranski Laboratorium für Physikalische und Theoretische Chemie, Institut für ChemieTechnische Universität Berlin, Strasse des 17 Juni 124, 10623 Berlin Germany
| | - Ingo Hoffmann
- Institut Max von Laue‐Paul Langevin (ILL) F‐38042 Grenoble Cedex 9 France
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45
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Lotz L, Raffel N, Blum S, Hoffmann I, Beckmann MW, Dittrich R. Erfahrungen mit der Kryokonservierung von Ovarialgewebe bei präpubertären und pubertären Mädchen an der Frauenklinik des Universitätsklinikum Erlangen. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1671649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Affiliation(s)
- L Lotz
- Universitätsfrauenklinik Erlangen, Erlangen, Deutschland
| | - N Raffel
- Universitätsfrauenklinik Erlangen, Erlangen, Deutschland
| | - S Blum
- Universitätsfrauenklinik Erlangen, Erlangen, Deutschland
| | - I Hoffmann
- Universitätsfrauenklinik Erlangen, Erlangen, Deutschland
| | - MW Beckmann
- Universitätsfrauenklinik Erlangen, Erlangen, Deutschland
| | - R Dittrich
- Universitätsfrauenklinik Erlangen, Erlangen, Deutschland
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46
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Lotz L, Raffel N, Hoffmann I, Beckmann MW, Dittrich R. Does endometriosis affect oocyte quality in in vitro fertilization and intracytoplasmic sperm injection cycles compared to oocyte were endometrioses has been excluded by laparoscopy? Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1670981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Affiliation(s)
- L Lotz
- Universitätsfrauenklinik Erlangen, Erlangen, Deutschland
| | - N Raffel
- Universitätsfrauenklinik Erlangen, Erlangen, Deutschland
| | - I Hoffmann
- Universitätsfrauenklinik Erlangen, Erlangen, Deutschland
| | - MW Beckmann
- Universitätsfrauenklinik Erlangen, Erlangen, Deutschland
| | - R Dittrich
- Universitätsfrauenklinik Erlangen, Erlangen, Deutschland
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47
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Raffel N, Fattahi A, Boccaccini AR, Lotz L, Hoffmann I, Beckmann MW, Dittrich R, Liverani L. Biomimetic approach for the development of artificial ovary: first promising results. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1671620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Affiliation(s)
- N Raffel
- Erlangen University Hospital, Friedrich-Alexander University Erlangen-Nürnberg, Department of Obstetrics and Gynecology, Erlangen, Deutschland
| | - A Fattahi
- Erlangen University Hospital, Friedrich-Alexander University Erlangen-Nürnberg, Department of Obstetrics and Gynecology, Erlangen, Deutschland
| | - AR Boccaccini
- University Erlangen-Nürnberg, Institute of Biomaterials, Department of Materials Science and Engineering, Erlangen, Deutschland
| | - L Lotz
- Erlangen University Hospital, Friedrich-Alexander University Erlangen-Nürnberg, Department of Obstetrics and Gynecology, Erlangen, Deutschland
| | - I Hoffmann
- Erlangen University Hospital, Friedrich-Alexander University Erlangen-Nürnberg, Department of Obstetrics and Gynecology, Erlangen, Deutschland
| | - MW Beckmann
- Erlangen University Hospital, Friedrich-Alexander University Erlangen-Nürnberg, Department of Obstetrics and Gynecology, Erlangen, Deutschland
| | - R Dittrich
- Erlangen University Hospital, Friedrich-Alexander University Erlangen-Nürnberg, Department of Obstetrics and Gynecology, Erlangen, Deutschland
| | - L Liverani
- University Erlangen-Nürnberg, Institute of Biomaterials, Department of Materials Science and Engineering, Erlangen, Deutschland
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48
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Ciepluch K, Radulescu A, Hoffmann I, Raba A, Allgaier J, Richter D, Biehl R. Influence of PEGylation on Domain Dynamics of Phosphoglycerate Kinase: PEG Acts Like Entropic Spring for the Protein. Bioconjug Chem 2018; 29:1950-1960. [DOI: 10.1021/acs.bioconjchem.8b00203] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Karol Ciepluch
- Jülich Centre for Neutron Science & Institute of Complex Systems (JCNS-1&ICS-1), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Aurel Radulescu
- Jülich Centre for Neutron Science JCNS at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich, 85748 Garching, Germany
| | - Ingo Hoffmann
- Institute Laue-Langevin (ILL), 71 rue des Martyrs, 38042 Grenoble, Cedex 9, France
| | - Andreas Raba
- Jülich Centre for Neutron Science & Institute of Complex Systems (JCNS-1&ICS-1), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Jürgen Allgaier
- Jülich Centre for Neutron Science & Institute of Complex Systems (JCNS-1&ICS-1), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Dieter Richter
- Jülich Centre for Neutron Science & Institute of Complex Systems (JCNS-1&ICS-1), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Ralf Biehl
- Jülich Centre for Neutron Science & Institute of Complex Systems (JCNS-1&ICS-1), Forschungszentrum Jülich, 52425 Jülich, Germany
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49
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50
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Affiliation(s)
- Ingo Hoffmann
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC 7, D-10623 Berlin, Germany
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Claudia Hoffmann
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC 7, D-10623 Berlin, Germany
| | - Bela Farago
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Sylvain Prévost
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC 7, D-10623 Berlin, Germany
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
- Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany
| | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC 7, D-10623 Berlin, Germany
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