cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2510244
title: Investigation of Magnetic Ground State of a Potential Kitaev Quantum Spin Liquid Candidate

description: Na2Co2RuO6 (NCRO) is a newly synthesized compound that crystallizes in the hexagonal P6322 structure. NCRO is a prospective Kitaev-type quantum spin liquid (QSL) candidate, as evidenced by the absence of long-range magnetic ordering down to 2 K, despite the strong antiferromagnetic interactions as indicated by a Curie-Weiss temperature of –126 K. This suggests significant spin frustration. In order to investigate this quantum spin liquid (QSL) candidate, we have implemented bulk magnetic measurements and heat capacity experiments. Nevertheless, The objective of this proposal is to get a compact understanding of the intriguing magnetic ground state of this system. We will do both ZF and LF muSR at a temperature range of 60 mK to 200 K, to explore if there is magnetic ordering or topological ordering beyond the Landau-Ginzburg paradigm of symmetry breaking present below 2 K.
DOI: 10.5286/isis.e.rb2510244-1
title: Investigation of Magnetic Ground State of a Potential Kitaev Quantum Spin Liquid Candidate

description: Na2Co2RuO6 (NCRO) is a newly synthesized compound that crystallizes in the hexagonal P6322 structure. NCRO is a prospective Kitaev-type quantum spin liquid (QSL) candidate, as evidenced by the absence of long-range magnetic ordering down to 2 K, despite the strong antiferromagnetic interactions as indicated by a Curie-Weiss temperature of –126 K. This suggests significant spin frustration. In order to investigate this quantum spin liquid (QSL) candidate, we have implemented bulk magnetic measurements and heat capacity experiments. Nevertheless, The objective of this proposal is to get a compact understanding of the intriguing magnetic ground state of this system. We will do both ZF and LF muSR at a temperature range of 60 mK to 200 K, to explore if there is magnetic ordering or topological ordering beyond the Landau-Ginzburg paradigm of symmetry breaking present below 2 K.
DOI: 10.3535/c9m-crn-eqx
title: Cerastium brachypetalum subsp. brachypetalum

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/rnc-jkm-q1z
title: Epilobium hirsutum L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2510701
title: Botanical Biomaterials: Sustainable Hydrogel Biomaterials from Plant Proteins

description: There is a current and urgent need to seek more affordable and low-cost manufacturing routes for the production of biomaterials. Plant derived biomaterials constructed from proteins offer an exciting avenue to address the growing need for sustainable biocompatible and biodegradable materials. This growing area is providing a route for manufacturing living materials from inexpensive and easily accessible resources. The thermal-induced gelation of plant proteins is well established6. An alternative, but as yet relatively unexplored, route is to retain the folded functionality of the protein and trigger gelation through photoactivated chemical cross-linking. In a new project at Leeds we are exploring the physics of gelation of plant proteins. In this proposal we will study the formulation, function and mechanics (at Leeds) and structure (using SANS) of plant-derived protein in the construction of folded protein hydrogels, using extracted from wheat gluten. We propose to use SANS on the instrument LOQ to characterise the structure of our gluten hydrogels. This insight into the structure of gluten extract hydrogels will be used in conjunction with our biophysical and rheological studies at Leeds, to provide us with a cross-length understanding of gluten biomaterials. This will illuminate a new avenue in the development of novel, sustainable and ethical biomaterials.
DOI: 10.5286/isis.e.rb2510701-1
title: Botanical Biomaterials: Sustainable Hydrogel Biomaterials from Plant Proteins

description: There is a current and urgent need to seek more affordable and low-cost manufacturing routes for the production of biomaterials. Plant derived biomaterials constructed from proteins offer an exciting avenue to address the growing need for sustainable biocompatible and biodegradable materials. This growing area is providing a route for manufacturing living materials from inexpensive and easily accessible resources. The thermal-induced gelation of plant proteins is well established6. An alternative, but as yet relatively unexplored, route is to retain the folded functionality of the protein and trigger gelation through photoactivated chemical cross-linking. In a new project at Leeds we are exploring the physics of gelation of plant proteins. In this proposal we will study the formulation, function and mechanics (at Leeds) and structure (using SANS) of plant-derived protein in the construction of folded protein hydrogels, using extracted from wheat gluten. We propose to use SANS on the instrument LOQ to characterise the structure of our gluten hydrogels. This insight into the structure of gluten extract hydrogels will be used in conjunction with our biophysical and rheological studies at Leeds, to provide us with a cross-length understanding of gluten biomaterials. This will illuminate a new avenue in the development of novel, sustainable and ethical biomaterials.
DOI: 10.34816/ifao.archives.232980
title: SAQQARA_nb_1994_06049

description: Référence : nb_1994_06049<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/023-d64-kl3
title: Ononis spinosa L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2510226-1
title: Search for time-reversal symmetry breaking in layered chalcogenides

description: Layered van der Waals materials provide a versatile platform for exploring new topological and superconducting phenomena. Transition metal dichalcogenides (TMDs), especially those with broken time-reversal symmetry (TRS), are promising candidates for unconventional superconductivity. This proposal focuses on 4Hb-TaSeS, a heterostructure of superconducting 1H-TaSeS and 1T-TaSeS layers. The goal is to study the superconducting pairing mechanism and TRS breaking in 4Hb-TaSeS using the μSR technique, which probes local magnetic fields to reveal the superconducting order parameter symmetry and internal magnetic fields. The findings could uncover unconventional pairing or topological phases, contributing to novel superconducting device development and a deeper understanding of layered superconductors.
DOI: 10.5286/isis.e.rb2510638
title: Unraveling the Structure and Density of the PEG Corona on Upconverting Nanoparticles with SANS

description: Upconverting nanoparticles (UC-NPs) are unique in their ability to convert near-infrared light into shorter wavelength radiation, presenting valuable opportunities in health and technology. Optimal fluorescence efficiency in UC-NPs requires homogeneous shapes and sizes, which is best achieved through thermal decomposition synthesis using oleic acid (OA) as a surface ligand in organic solvents, thus yielding hydrophobic particles. For biomedical applications, poly(ethylene glycol) (PEG), which forms a stabilizing corona minimizing interactions with proteins and extending blood circulation time, is used to replace OA. However structurally characterizing the PEG layer, while crucial, is challenging due to its low contrast in electron microscopy and Small-Angle X-ray Scattering. To overcome this, our approach uses Small-Angle Neutron Scattering (SANS) with contrast variation of the solvent (H2O/D2O), hence highlighting the PEG layer. Furthermore, multiple contrasts provide model-independent information on the PEG fraction on the particles. This proposal aims to use contrast-variation SANS to probe the thickness, graft density, and configuration of PEG on UC-NPs and detect the presence of residual OA. Our study, part of the EU project Metrology for Innovative NanoTherapeutics (MetrINo-https://metrino.eu), will enhance our understanding of PEGylation in UC-NPs for biomedical applications, and contribute to the development of harmonized measurement and data analysis methods.
DOI: 10.5286/isis.e.rb2510638-1
title: Unraveling the Structure and Density of the PEG Corona on Upconverting Nanoparticles with SANS

description: Upconverting nanoparticles (UC-NPs) are unique in their ability to convert near-infrared light into shorter wavelength radiation, presenting valuable opportunities in health and technology. Optimal fluorescence efficiency in UC-NPs requires homogeneous shapes and sizes, which is best achieved through thermal decomposition synthesis using oleic acid (OA) as a surface ligand in organic solvents, thus yielding hydrophobic particles. For biomedical applications, poly(ethylene glycol) (PEG), which forms a stabilizing corona minimizing interactions with proteins and extending blood circulation time, is used to replace OA. However structurally characterizing the PEG layer, while crucial, is challenging due to its low contrast in electron microscopy and Small-Angle X-ray Scattering. To overcome this, our approach uses Small-Angle Neutron Scattering (SANS) with contrast variation of the solvent (H2O/D2O), hence highlighting the PEG layer. Furthermore, multiple contrasts provide model-independent information on the PEG fraction on the particles. This proposal aims to use contrast-variation SANS to probe the thickness, graft density, and configuration of PEG on UC-NPs and detect the presence of residual OA. Our study, part of the EU project Metrology for Innovative NanoTherapeutics (MetrINo-https://metrino.eu), will enhance our understanding of PEGylation in UC-NPs for biomedical applications, and contribute to the development of harmonized measurement and data analysis methods.
DOI: 10.3535/acn-fj0-e1a
title: Lupinus angustifolius L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/l6h-sxb-pgm
title: Stellaria apetala Bernardino

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2510189
title: High-energy spin dynamics in multiferroic ErFeO3 for magnon transport application

description: ErFeO₃, a multiferroic material, displays rich magnetic behaviour due to the interaction between Fe³⁺ and Er³⁺ ions, making it a promising candidate for spintronics and magnonics applications. While the low-energy magnon dynamics of this system have been extensively studied, the high-energy regime remains unexplored. This proposal aims to investigate the high-energy spin dynamics of ErFeO₃ using inelastic neutron scattering studies employing Merlin spectrometer. We will measure the magnon dispersions up to 100 meV at temperatures below and above magnetic transitions: (i) Fe³⁺ spin reorientation at ~95 K and (ii) Er³⁺ ordering at 4.5 K. Understanding the Fe - Fe interactions, including Heisenberg exchange and Dzyaloshinskii-Moriya interactions, will offer insights into spin-wave propagation crucial for future magnon-based devices. Our study will contribute to the development of spintronics by providing data on magnon group velocities and magnon propagation lengths, both vital for efficient magnon transport.
DOI: 10.5286/isis.e.rb2510189-1
title: High-energy spin dynamics in multiferroic ErFeO3 for magnon transport application

description: ErFeO₃, a multiferroic material, displays rich magnetic behaviour due to the interaction between Fe³⁺ and Er³⁺ ions, making it a promising candidate for spintronics and magnonics applications. While the low-energy magnon dynamics of this system have been extensively studied, the high-energy regime remains unexplored. This proposal aims to investigate the high-energy spin dynamics of ErFeO₃ using inelastic neutron scattering studies employing Merlin spectrometer. We will measure the magnon dispersions up to 100 meV at temperatures below and above magnetic transitions: (i) Fe³⁺ spin reorientation at ~95 K and (ii) Er³⁺ ordering at 4.5 K. Understanding the Fe - Fe interactions, including Heisenberg exchange and Dzyaloshinskii-Moriya interactions, will offer insights into spin-wave propagation crucial for future magnon-based devices. Our study will contribute to the development of spintronics by providing data on magnon group velocities and magnon propagation lengths, both vital for efficient magnon transport.
DOI: 10.5286/isis.e.rb2510226
title: Search for time-reversal symmetry breaking in layered chalcogenides

description: Layered van der Waals materials provide a versatile platform for exploring new topological and superconducting phenomena. Transition metal dichalcogenides (TMDs), especially those with broken time-reversal symmetry (TRS), are promising candidates for unconventional superconductivity. This proposal focuses on 4Hb-TaSeS, a heterostructure of superconducting 1H-TaSeS and 1T-TaSeS layers. The goal is to study the superconducting pairing mechanism and TRS breaking in 4Hb-TaSeS using the μSR technique, which probes local magnetic fields to reveal the superconducting order parameter symmetry and internal magnetic fields. The findings could uncover unconventional pairing or topological phases, contributing to novel superconducting device development and a deeper understanding of layered superconductors.
DOI: 10.34816/ifao.archives.232981
title: SAQQARA_nb_1994_06050

description: Référence : nb_1994_06050<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/g5n-tm3-ng6
title: Carex nigra (L.) Reichard

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/t3r-847-yqb
title: Dichodon cerastoides (L.) Rchb.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2410664
title: Understanding muon states in nitrogen containing heterocyclic materials

description: Recent research shows that nitrogen (N) plays a significant role in the development of organic semiconductors (OSCs). Nitrogen-containing heterocyclic compounds, such as pyridine and pyrrole derivatives, are often used in organic semiconductors as charge transport materials facilitating the movement of charge carriers (electrons and holes) within the material. Nitrogen-containing compounds also can be used to create phosphorescent materials that emit light efficiently and are critical for achieving bright and energy-efficient OLED displays and lighting. Their spin dynamics are of crucial importance to understanding their function, and it has been shown that muons are an excellent technique to do so. Recently, Hernández-Melián et al. have reported that muonium may attach to the N atoms even though the N atom already has three single bonds with neighbour atoms. Adam Berlie et al. also reported that the bare muon is attracted to the N atom with the final state being diamagnetic. Here we intend to better understand the formation of different muon states in nitrogen-containing OSCs and N.
DOI: 10.5286/isis.e.rb2410664-1
title: Understanding muon states in nitrogen containing heterocyclic materials

description: Recent research shows that nitrogen (N) plays a significant role in the development of organic semiconductors (OSCs). Nitrogen-containing heterocyclic compounds, such as pyridine and pyrrole derivatives, are often used in organic semiconductors as charge transport materials facilitating the movement of charge carriers (electrons and holes) within the material. Nitrogen-containing compounds also can be used to create phosphorescent materials that emit light efficiently and are critical for achieving bright and energy-efficient OLED displays and lighting. Their spin dynamics are of crucial importance to understanding their function, and it has been shown that muons are an excellent technique to do so. Recently, Hernández-Melián et al. have reported that muonium may attach to the N atoms even though the N atom already has three single bonds with neighbour atoms. Adam Berlie et al. also reported that the bare muon is attracted to the N atom with the final state being diamagnetic. Here we intend to better understand the formation of different muon states in nitrogen-containing OSCs and N.
DOI: 10.5286/isis.e.rb2420251-1
title: Exploring lipid dynamics in animal organs affected by inhaled particulate matter through quasi-elastic neutron scattering (QENS)

description: The experiments proposed involve utilizing the OSIRIS instrument at ISIS to conduct Quasi-elastic neutron scattering (QENS) experiments. These experiments aim to investigate the dynamics of lipids affected by particles within a complex and advanced biological system. To move beyond cellular models, the proposed experiment will assess lipid dynamics in key organs (e.g., lung and brain) derived from animal experiments. This will involve comparing conditions with and without inhaled particles, as well as comparing between healthy and compromised conditions under inflammatory status.
DOI: 10.3535/3x6-sp2-xq3
title: Milium effusum L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/4da-tks-5dk
title: Carex mucronata All.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2420251
title: Exploring lipid dynamics in animal organs affected by inhaled particulate matter through quasi-elastic neutron scattering (QENS)

description: The experiments proposed involve utilizing the OSIRIS instrument at ISIS to conduct Quasi-elastic neutron scattering (QENS) experiments. These experiments aim to investigate the dynamics of lipids affected by particles within a complex and advanced biological system. To move beyond cellular models, the proposed experiment will assess lipid dynamics in key organs (e.g., lung and brain) derived from animal experiments. This will involve comparing conditions with and without inhaled particles, as well as comparing between healthy and compromised conditions under inflammatory status.
DOI: 10.5286/isis.e.rb2510160
title: Muon spin relaxation study of Hidden Ordering and Spin-glass-like transitions in Gd2Hf2O7

description: The ground state of Heisenberg pyrochlore antiferromagnet is the non-symmetry-breaking classical spin liquid with infinite degeneracy that can be lifted by perturbations like dipolar interactions and bond-disorder inducing long-range order and spin-glass state. The neutron diffraction study on Heisenberg pyrochlore Gd2Hf2O7 show evidence of bond-disorder, however no evidence for long-range magnetic ordering in specific heat and neutron diffraction measurements down to 0.07 K, but ac susceptibility reveals sharp peak (frequency-independent) near 0.68 K suggesting an ordering transition (hidden order), and a frequency-dependent spin-glass-like anomaly near 0.58 K. Because of the high sensitivity of muons to extremely small magnetic fields and suitability of SR for investigating the glassy spin-dynamics, µSR investigations of magnetic properties of Gd2Hf2O7 would be very informative. We propose to carry out a µSR study down to 0.05 K on Gd2Hf2O7 using the EMU spectrometer to uncover the nature of hidden transition.
DOI: 10.5286/isis.e.rb2510160-1
title: Muon spin relaxation study of Hidden Ordering and Spin-glass-like transitions in Gd2Hf2O7

description: The ground state of Heisenberg pyrochlore antiferromagnet is the non-symmetry-breaking classical spin liquid with infinite degeneracy that can be lifted by perturbations like dipolar interactions and bond-disorder inducing long-range order and spin-glass state. The neutron diffraction study on Heisenberg pyrochlore Gd2Hf2O7 show evidence of bond-disorder, however no evidence for long-range magnetic ordering in specific heat and neutron diffraction measurements down to 0.07 K, but ac susceptibility reveals sharp peak (frequency-independent) near 0.68 K suggesting an ordering transition (hidden order), and a frequency-dependent spin-glass-like anomaly near 0.58 K. Because of the high sensitivity of muons to extremely small magnetic fields and suitability of SR for investigating the glassy spin-dynamics, µSR investigations of magnetic properties of Gd2Hf2O7 would be very informative. We propose to carry out a µSR study down to 0.05 K on Gd2Hf2O7 using the EMU spectrometer to uncover the nature of hidden transition.
DOI: 10.34816/ifao.archives.232982
title: SAQQARA_nb_1994_06051

description: Référence : nb_1994_06051<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/th0-66q-x56
title: Carex limosa L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2510254
title: An in vitro gram-negative double bilayer envelope mimetic

description: The gram-negative bacterial envelope is a complex structure composed of two membranes and a peptidoglycan layer that together maintain the cell's integrity and shape. Despite extensive knowledge of its composition, replicating this system in vitro remains a challenge, particularly for trans-envelope studies, as existing models focus on either the outer or inner membrane alone. The study of transport processes between these membranes, especially biogenic transport responsible for outer membrane (OM) formation, is therefore limited. One key system, the PqiABC complex, is believed to facilitate glycerophospholipid (GPL) transport by forming a trans-envelope tunnel, tethering the two membranes. Previous work by us has shown that PqiABC can be reconstituted and used to construct a double bilayer architecture on a planar surface. In this proposal, we aim to utilise a non-functional variant of PqiABC as a scaffold to study other trans-envelope biogenic processes. As a proof of concept, by integrating the Maintenance of Outer Membrane Lipid Asymmetry (Mla) pathway, which regulates GPL distribution between the membranes, we will investigate its activity in this controlled mimetic system. This approach has the potential to significantly advance the accuracy of in vitro studies of gram-negative envelope biology, enabling more precise investigations into membrane dynamics and transport processes.
DOI: 10.5286/isis.e.rb2510254-1
title: An in vitro gram-negative double bilayer envelope mimetic

description: The gram-negative bacterial envelope is a complex structure composed of two membranes and a peptidoglycan layer that together maintain the cell's integrity and shape. Despite extensive knowledge of its composition, replicating this system in vitro remains a challenge, particularly for trans-envelope studies, as existing models focus on either the outer or inner membrane alone. The study of transport processes between these membranes, especially biogenic transport responsible for outer membrane (OM) formation, is therefore limited. One key system, the PqiABC complex, is believed to facilitate glycerophospholipid (GPL) transport by forming a trans-envelope tunnel, tethering the two membranes. Previous work by us has shown that PqiABC can be reconstituted and used to construct a double bilayer architecture on a planar surface. In this proposal, we aim to utilise a non-functional variant of PqiABC as a scaffold to study other trans-envelope biogenic processes. As a proof of concept, by integrating the Maintenance of Outer Membrane Lipid Asymmetry (Mla) pathway, which regulates GPL distribution between the membranes, we will investigate its activity in this controlled mimetic system. This approach has the potential to significantly advance the accuracy of in vitro studies of gram-negative envelope biology, enabling more precise investigations into membrane dynamics and transport processes.