cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2410346
title: Possible spin-liquid state in the rare-earth based kagome antiferromagnet

description: The interplay between spin-orbit coupling, spin correlation, and crystal electric field in rare-earth-based geometrically frustrated magnets offers a promising ground for the search for enigmatic quantum spin liquids (QSL). QSL is a highly entangled state ideal to host fractional excitations coupled to emergent gauge fields and has immense potential for braiding quantum computing technology. However, the experimental realization of QSL is a challenging theme due to the presence of defect and disorder in real quantum materials. Here, we focus on a new rare-earth-based spin-lattice Pr3BWO9 wherein Pr3+ ions constitute a two-dimensional corner shared triangles decorating a kagome quantum magnet. Neither magnetic susceptibility nor specific-heat data show any signature of long-range magnetic ordering or spin freezing down to 70 mK despite a sizable Curie-Weiss temperature of θcw = - 6.8 K. This calls for more sensitive local-probe magnetic investigations that could unambiguously confirm the spin-liquid ground state and characterize the corresponding magnetic excitations at very low temperature given the rather weak exchange coupling between Pr3+ moments. We propose a µSR study at sub-kelvin temperatures to provide valuable insight and confirm the spin-liquid conjecture in this novel rare-earth-based kagome lattice antiferromagnet family and to explore the role of rare-earth ions on the quantum-disordered state.
DOI: 10.5286/isis.e.rb2410346-1
title: Possible spin-liquid state in the rare-earth based kagome antiferromagnet

description: The interplay between spin-orbit coupling, spin correlation, and crystal electric field in rare-earth-based geometrically frustrated magnets offers a promising ground for the search for enigmatic quantum spin liquids (QSL). QSL is a highly entangled state ideal to host fractional excitations coupled to emergent gauge fields and has immense potential for braiding quantum computing technology. However, the experimental realization of QSL is a challenging theme due to the presence of defect and disorder in real quantum materials. Here, we focus on a new rare-earth-based spin-lattice Pr3BWO9 wherein Pr3+ ions constitute a two-dimensional corner shared triangles decorating a kagome quantum magnet. Neither magnetic susceptibility nor specific-heat data show any signature of long-range magnetic ordering or spin freezing down to 70 mK despite a sizable Curie-Weiss temperature of θcw = - 6.8 K. This calls for more sensitive local-probe magnetic investigations that could unambiguously confirm the spin-liquid ground state and characterize the corresponding magnetic excitations at very low temperature given the rather weak exchange coupling between Pr3+ moments. We propose a µSR study at sub-kelvin temperatures to provide valuable insight and confirm the spin-liquid conjecture in this novel rare-earth-based kagome lattice antiferromagnet family and to explore the role of rare-earth ions on the quantum-disordered state.
DOI: 10.3535/943-rpe-hw1
title: Allium orientale Boiss.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/9ls-ex3-yfp
title: Eryngium falcatum F. Delaroche

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2410531
title: A biophysical study of an innovative nanoconstruct designed for theranostic against Multiple Myeloma

description: This project aims to develop a new cancer treatment (theranostic) specific for Multiple myeloma (MM) a hematologic malignancy. This
project develops a stimuli-responsive Nanoparticle (NP) coupled to an anticancer drug (Carfilzomib) embedded in a shell of mixed
synthetic and natural lipids and which is targeted with monoclonal antibodies. Preliminary data allowed us to study the NP's shape, size
and structure. NR will allow us to investigate the interaction between the NP and the membrane of a cell target.
DOI: 10.5286/isis.e.rb2410531-1
title: A biophysical study of an innovative nanoconstruct designed for theranostic against Multiple Myeloma

description: This project aims to develop a new cancer treatment (theranostic) specific for Multiple myeloma (MM) a hematologic malignancy. This
project develops a stimuli-responsive Nanoparticle (NP) coupled to an anticancer drug (Carfilzomib) embedded in a shell of mixed
synthetic and natural lipids and which is targeted with monoclonal antibodies. Preliminary data allowed us to study the NP's shape, size
and structure. NR will allow us to investigate the interaction between the NP and the membrane of a cell target.
DOI: 10.34816/ifao.archives.232776
title: SAQQARA_nb_1994_03270

description: Référence : nb_1994_03270<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/gtd-22h-133
title: Lamiaceae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2300057
title: Determination of the magnetic structure of the quantum multiferroic Cs2Cu2Mo3O12

description: Slow relaxational dynamics of electric polarization are characteristic of ferroelectrics and reveal themselves in dissipative anomalies of the dielectric constant. We have found such anomalies in the nonpolar frustrated quasi-1D quantum ferro-antiferromagnet Cs2Cu2Mo3O12. The dielectric response shows two distinct components: a critical divergence at the field-induced magnetic quantum critical point (QCP), and an unusual dissipative peak at ultra-low temperatures, present at all fields. The former stems from the inverse Dzyaloshinskii-Moriya mechanism in the strongly magnetized state. The latter manifests itself as a strong modulation in the complex permittivity with a marked field and temperature dependence, which also becomes critical at the magnetic transition. This last feature is in full agreement with a model of Debye-like relaxation of electric dipoles mediated by the soft magnon that softens at the QCP, through a newly discovered multiferroic relaxation process. Nonetheless, a microscopic model is lacking. Understanding the lattice symmetry at low temperatures and determining the magnetic structure of Cs2Cu2Mo3O12 will be instrumental in clarifying the origin of this mechanism.
DOI: 10.5286/isis.e.rb2300057-1
title: Determination of the magnetic structure of the quantum multiferroic Cs2Cu2Mo3O12

description: Slow relaxational dynamics of electric polarization are characteristic of ferroelectrics and reveal themselves in dissipative anomalies of the dielectric constant. We have found such anomalies in the nonpolar frustrated quasi-1D quantum ferro-antiferromagnet Cs2Cu2Mo3O12. The dielectric response shows two distinct components: a critical divergence at the field-induced magnetic quantum critical point (QCP), and an unusual dissipative peak at ultra-low temperatures, present at all fields. The former stems from the inverse Dzyaloshinskii-Moriya mechanism in the strongly magnetized state. The latter manifests itself as a strong modulation in the complex permittivity with a marked field and temperature dependence, which also becomes critical at the magnetic transition. This last feature is in full agreement with a model of Debye-like relaxation of electric dipoles mediated by the soft magnon that softens at the QCP, through a newly discovered multiferroic relaxation process. Nonetheless, a microscopic model is lacking. Understanding the lattice symmetry at low temperatures and determining the magnetic structure of Cs2Cu2Mo3O12 will be instrumental in clarifying the origin of this mechanism.
DOI: 10.5286/isis.e.rb2310667
title: SANS study for the distribution and aggregation of Sphingosine in the membrane of large unilamellar vesicles (LUVs)

description: The incursion of sphingosine in membrane always accompanies with the increase of membrane permeability, which results in the leakage of the substance in cell organelle, and eventually the cell death. The reason why the sphingosine increases the membrane permeability is currently unclear, but changes in the structure of the membrane after incorporating sphingosine must play an important role. A convincing hypothesis is that sphingosine interacts with membrane components, forming nanoscale aggregates in membrane. However, it cannot be fully confirmed due to experimental limitations. We propose to use SANS to reveal the effects of sphingosine with different chain structures on the LUVs model membranes, to obtain the distribution of sphingosine molecules in the membrane, and to determine whether there are nanoscale aggregates formed on the membrane. This study will provide support for elucidating how the molecular structure of sphingosine affects membrane structure and provide evidence for the reason why sphingosine increases membrane permeability.
DOI: 10.5286/isis.e.rb2310667-1
title: SANS study for the distribution and aggregation of Sphingosine in the membrane of large unilamellar vesicles (LUVs)

description: The incursion of sphingosine in membrane always accompanies with the increase of membrane permeability, which results in the leakage of the substance in cell organelle, and eventually the cell death. The reason why the sphingosine increases the membrane permeability is currently unclear, but changes in the structure of the membrane after incorporating sphingosine must play an important role. A convincing hypothesis is that sphingosine interacts with membrane components, forming nanoscale aggregates in membrane. However, it cannot be fully confirmed due to experimental limitations. We propose to use SANS to reveal the effects of sphingosine with different chain structures on the LUVs model membranes, to obtain the distribution of sphingosine molecules in the membrane, and to determine whether there are nanoscale aggregates formed on the membrane. This study will provide support for elucidating how the molecular structure of sphingosine affects membrane structure and provide evidence for the reason why sphingosine increases membrane permeability.
DOI: 10.34816/ifao.archives.232777
title: SAQQARA_nb_1994_03271

description: Référence : nb_1994_03271<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/g4f-9s6-j3d
title: Ranunculus L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/tym-ch3-pyk
title: Trifolium Tourn. ex L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2255020-2
title: Commercial Use of Muons
DOI: 10.5286/isis.e.rb2410377
title: Probing microfluidic assembly of mRNA encapsulated lipid nanoparticles

description: Messenger RNA medicines enables the treatment of classically undruggable diseases and immunisation against emergent pathogens by administering the genetic sequence encoding for specific proteins or antigens. However naked mRNA is highly susceptible to endogenous nucleases and does not associate with cells, hence must be formulated. The most translatable approach is to employ small (50-150 nm diameter) lipid nanoparticles (LNPs) which protect and facilitate cellular transport of mRNA. The physicochemical nanostructure of the LNPs are critical to their biological activity. Both properties are controlled by the manufacture parameters used for the assembly process. Yet little is understood about the evolution of the nanostructure within these complex nanoparticles during assembly, which influences their final form and biological efficacy. Hence in this proposal we aim to use neutron scattering via SANS2D to assess the evolution of LNP nanostructure in microfluidic assembly. We will collect the scattering pattern over different distances away from the mixing junction on a quartz microfluidic mixer. Experiments will be conducted under a range of contrast matching regimes to evaluate the assembly dynamics of the mRNA, lipids and total material independently. The outcomes of this experiment will establish a novel protocol to assess LNP assembly and future design of LNP chemistry and manufacture.
DOI: 10.5286/isis.e.rb2410377-1
title: Probing microfluidic assembly of mRNA encapsulated lipid nanoparticles

description: Messenger RNA medicines enables the treatment of classically undruggable diseases and immunisation against emergent pathogens by administering the genetic sequence encoding for specific proteins or antigens. However naked mRNA is highly susceptible to endogenous nucleases and does not associate with cells, hence must be formulated. The most translatable approach is to employ small (50-150 nm diameter) lipid nanoparticles (LNPs) which protect and facilitate cellular transport of mRNA. The physicochemical nanostructure of the LNPs are critical to their biological activity. Both properties are controlled by the manufacture parameters used for the assembly process. Yet little is understood about the evolution of the nanostructure within these complex nanoparticles during assembly, which influences their final form and biological efficacy. Hence in this proposal we aim to use neutron scattering via SANS2D to assess the evolution of LNP nanostructure in microfluidic assembly. We will collect the scattering pattern over different distances away from the mixing junction on a quartz microfluidic mixer. Experiments will be conducted under a range of contrast matching regimes to evaluate the assembly dynamics of the mRNA, lipids and total material independently. The outcomes of this experiment will establish a novel protocol to assess LNP assembly and future design of LNP chemistry and manufacture.
DOI: 10.3535/ga8-5tq-7kw
title: Melanortocarya obtusifolia (Willd.) Selvi, Bigazzi, Hilger & Papini

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/q3z-wnd-ssn
title: Astragalus sanctus Boiss.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2410305
title: FePSe3: Probing and fitting spin orbit excitons in 2d magnets

description: FePSe3 is a two dimensional material which has an orbital degeneracy tied to the Fe2+ site. FePSe3 undergoes a combined structural and magnetic transition at around 110 K. We propose to measure the spin-orbit excitations in this material using the MAPS spectrometer. The two dimensional nature will make this compound an ideal system to attempt fits of our spin-orbit exciton models to and also apply newly developed machine learning algorithms. This will allow us to characterize the various competing single-ion and magnetic exchange terms in the magnetic Hamiltonian and relate these to the magnetoelastic properties.
DOI: 10.5286/isis.e.rb2410305-1
title: FePSe3: Probing and fitting spin orbit excitons in 2d magnets

description: FePSe3 is a two dimensional material which has an orbital degeneracy tied to the Fe2+ site. FePSe3 undergoes a combined structural and magnetic transition at around 110 K. We propose to measure the spin-orbit excitations in this material using the MAPS spectrometer. The two dimensional nature will make this compound an ideal system to attempt fits of our spin-orbit exciton models to and also apply newly developed machine learning algorithms. This will allow us to characterize the various competing single-ion and magnetic exchange terms in the magnetic Hamiltonian and relate these to the magnetoelastic properties.
DOI: 10.34816/ifao.archives.232778
title: SAQQARA_nb_1994_03272

description: Référence : nb_1994_03272<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/1qj-nw0-8qa
title: Brassicaceae Burnett

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/5pw-09q-bvw
title: Bergenia Moench

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310722
title: Transmission Neutron Scattering for Bragg Edge Analysis on bronze and Cu-based materials

description: Historical metallurgy, and in particular bronze and other copper alloy metallurgy, represents a research topic of strong importance in the study of artistic and technological evolution of different civilizations. Archaeometallurgy studies are generally carried out by means of destructive analytics, such as metallography and scanning electron microscope analysis on cross sections, while neutron research based activity is usually limited to specific topics or seen as a mysterious still unknown method by the scholars acting in this field. Since heritage science aims at preserving cultural artefacts and neutron methods have the potential of being the best non-destructive option for investigating bronze artefacts non-destructively, we proposed a project aiming to develop and calibrate, in a quantitative way, non-invasive techniques based on neutron absorption and scattering for analysis of historical and archaeological copper alloy artefacts. CHNet_BRONZE will address and combine three powerful bulk analysis methods: ToF-ND, BENT and NRTI measurements on different powders of high-purity copper, lead and calibrated mixtures of them, for optimizing the elemental, phase and microstructural calibration of the parameters obtained by the three measuring techniques, to exploit such refinement for the interpretation of the data collected (at present and in the future) on historical samples. This proposal is relative to BENT.
DOI: 10.5286/isis.e.rb2310722-1
title: Transmission Neutron Scattering for Bragg Edge Analysis on bronze and Cu-based materials

description: Historical metallurgy, and in particular bronze and other copper alloy metallurgy, represents a research topic of strong importance in the study of artistic and technological evolution of different civilizations. Archaeometallurgy studies are generally carried out by means of destructive analytics, such as metallography and scanning electron microscope analysis on cross sections, while neutron research based activity is usually limited to specific topics or seen as a mysterious still unknown method by the scholars acting in this field. Since heritage science aims at preserving cultural artefacts and neutron methods have the potential of being the best non-destructive option for investigating bronze artefacts non-destructively, we proposed a project aiming to develop and calibrate, in a quantitative way, non-invasive techniques based on neutron absorption and scattering for analysis of historical and archaeological copper alloy artefacts. CHNet_BRONZE will address and combine three powerful bulk analysis methods: ToF-ND, BENT and NRTI measurements on different powders of high-purity copper, lead and calibrated mixtures of them, for optimizing the elemental, phase and microstructural calibration of the parameters obtained by the three measuring techniques, to exploit such refinement for the interpretation of the data collected (at present and in the future) on historical samples. This proposal is relative to BENT.
DOI: 10.5286/isis.e.rb2410072-1
title: Elucidating the magnetic structure in a multiferroic system with a bipartite honeycomb network

description: Recently, a polar magnet Fe2Mo3O8 has garnered significant attention due to its intriguing multiferroic properties. It has a polar space group, and below the magnetic ordering temperature, both the space-inversion and time-reversal symmetries are broken, resulting in a novel magnetoelectric effect. Despite extensive research conducted on this material, the fundamental question about its magnetic configuration remains open. The magnetic Fe ions occupy two distinct oxygen coordination environments, octahedra and tetrahedra, and the question concerning in which site the magnetic moment is larger has not reached a consensus yet. Besides, the effect of Zn doping and its impact on the metamagnetic transition requires further exploration. To shed light on these issues, we plan to conduct single-crystal neutron diffraction on the parent compound Fe2Mo3O8 and a 25% Zn-doped compound Fe1.75Zn0.25Mo3O8.
DOI: 10.3535/gf8-7sr-lxq
title: Viola L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2410072
title: Elucidating the magnetic structure in a multiferroic system with a bipartite honeycomb network

description: Recently, a polar magnet Fe2Mo3O8 has garnered significant attention due to its intriguing multiferroic properties. It has a polar space group, and below the magnetic ordering temperature, both the space-inversion and time-reversal symmetries are broken, resulting in a novel magnetoelectric effect. Despite extensive research conducted on this material, the fundamental question about its magnetic configuration remains open. The magnetic Fe ions occupy two distinct oxygen coordination environments, octahedra and tetrahedra, and the question concerning in which site the magnetic moment is larger has not reached a consensus yet. Besides, the effect of Zn doping and its impact on the metamagnetic transition requires further exploration. To shed light on these issues, we plan to conduct single-crystal neutron diffraction on the parent compound Fe2Mo3O8 and a 25% Zn-doped compound Fe1.75Zn0.25Mo3O8.
DOI: 10.5286/isis.e.rb2410629-1
title: Unusual self-assembly of bicephalous surfactants: Nanomorphology and nanostructure from SANS

description: A novel class of surfactants have been synthesized – which we term bicephalous surfactants, with two quaternary ammonium headgroups linked by a C2 linker and 1 or 2 Cn-acyl tails connected to one of the headgroups. These bicephalous surfactants exhibit remarkable thermoresponsive and rheological behavior. For instance, the single-tailed C18-DQA undergoes reversible thermally-induced gelation-fluidization at ~ the body temperature. It is particularly unusual and perplexing that gelation would occur upon heating, in contrast to other small-molecule gels. Both trial SANS and cryo-TEM results indicated formation elongated aggregates. The zero-shear viscosity of the 800 mM C18-DQA solution would increase from 0.02 Pa s to 100,000 Pa s, by 7-8 orders of magnitude upon gelation. These striking observations from low molecular weight molecules are completely new and could open up significant potential applications. Here, we propose a first SANS study of the nanostructure and nanomorphology of self-assembled bicephalous surfactants, systematically varying the molecular architecture (sing tail and double tail of different lengths) and temperature.
DOI: 10.5286/isis.e/isis.e.rb2390175-1
title: {Empty 5mm banjo cell}_TRANS
DOI: 10.3535/hq7-54q-f84
title: Ceratocephala falcata (L.) Pers.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/xy1-0vq-8wd
title: Carex pachystylis J.Gay

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.