Monolayer Magnetic Metal with Scalable Conductivity.

2D magnets have emerged as a class of materials highly promising for studies of quantum phenomena and applications in ultra-compact spintronics. Current research aims at design of 2D magnets with particular functional properties. A formidable challenge is to produce metallic monolayers: the material landscape of layered magnetic systems is strongly dominated by insulators; rare metallic magnets, such as FeGeTe, become insulating as they approach the monolayer limit.

Clofazimine enhances anti-glioma effect of immunotherapy.

Rationale: Glioblastoma is one of the most aggressive human brain tumors. The prognosis is unfavorable and treatment effects are relatively low. However, temozolomide (TMZ) chemotherapy may prolong patients' survival.

On the possibility of implementing a quantum entanglement distribution in a biosystem: Microtubules.

The paper considers the possibility of implementing a quantum entanglement distribution in the cell microtubule. It has been shown that a quantum entanglement distribution proposed in the paper determines the process of quantum state teleportation through microtubule tryptophan chain. The work shows that the system of tryptophans in a microtubule essentially is a quantum network that consists of: spatially spaced nodes - tryptophans, quantum communication channels connecting tryptophans and qubits transmitted through these communication channels.

Lifshitz Transition in a Single-Atom-Thick GdYbPb Kagome Compound on Si(111).

Lanthanide (Ln) elements Gd and Yb alloyed with a Pb monolayer on the Si(111) substrate form LnPb compounds having the same crystal structure. They comprise a single-atom-thick Pb layer arranged in a slightly distorted kagome lattice with Ln atoms filling the hexagonal voids. They have similar electronic band structures except for the Fermi level position, which varies between the divalent Yb- and trivalent Gd-containing compounds by ∼0.

Influence of the even-odd effect on the crystal structure, band structure and optical properties of hybrid crystals of the [HN-(CH)-NH]PbX ( = 4-8 and X = Cl, Br, and I) type.

In the presented work, the structure dependence as well as luminescence features of a wide range of hybrid crystals based on lead halides and a homologous series of alkyl diamines from 1,4-diaminobutane to 1,8-diaminooctane are investigated. The structure of several previously undescribed hybrid crystals has been established. The even-odd effect of alkanes and its influence on the structure of such hybrid crystals have been demonstrated for the first time.

New Zosteropenillines and Pallidopenillines from the Seagrass-Derived Fungus KMM 4679.

Ten new decalin polyketides, zosteropenilline M (), 11--8-hydroxyzosteropenilline M (), zosteropenilline N (), 8-hydroxyzosteropenilline G (), zosteropenilline O (), zosteropenilline P (), zosteropenilline Q (), 13-dehydroxypallidopenilline A (), zosteropenilline R () and zosteropenilline S (), together with known zosteropenillines G () and J (), pallidopenilline A () and 1-acetylpallidopenilline A (), were isolated from the ethyl acetate extract of the fungus KMM 4679 associated with the seagrass . The structures of isolated compounds were established based on spectroscopic methods. The absolute configurations of zosteropenilline Q () and zosteropenilline S () were determined using a combination of the modified Mosher's method and ROESY data.

Fabrication and Magnetic Behavior of Jellyfish-Like Ni Nanowires Synthesized Using Bilayered Nanoporous Anodic Alumina Templates.

The potential to produce nanostructures with intricate shapes in large quantities holds promise for a range of applications in the fields of nanoelectronics and biomedicine. Here a method for fabricating jellyfish-like Ni nanowires (JFNWs) using bilayered nanoporous anodic alumina templates with through pores of varying diameters in each layer is presented. To assess the capabilities of this method, samples are created with different voltages during the second step of anodization, resulting in distinct geometrical characteristics of the second layer of the template, and subsequently synthesize Ni JFNWs.

Comparative Evaluation of the Antibacterial and Antitumor Activities of 9-Phenylfascaplysin and Its Analogs.

Based on the results of our own preliminary studies, the derivative of the marine alkaloid fascaplysin containing a phenyl substituent at C-9 was selected to evaluate the therapeutic potential in vivo and in vitro. It was shown that this compound has outstandingly high antimicrobial activity against Gram-positive bacteria, including antibiotic-resistant strains in vitro. The presence of a substituent at C-9 of the framework is of fundamental importance, since its replacement to neighboring positions leads to a sharp decrease in the selectivity of the antibacterial action, which indicates the presence of a specific therapeutic target in bacterial cells.

Fractional Marcus-Hush-Chidsey-Yakopcic current-voltage model for redox-based resistive memory devices.

We propose a circuit-level model combining the Marcus-Hush-Chidsey electron current equation and the Yakopcic equation for the state variable for describing resistive switching memory devices of the structure metal-ionic conductor-metal. We extend the dynamics of the state variable originally described by a first-order time derivative by introducing a fractional derivative with an arbitrary order between zero and one. We show that the extended model fits with great fidelity the current-voltage characteristic data obtained on a Si electrochemical metallization memory device with Ag-Cu alloy.

Bioactive Polyketides from the Natural Complex of the Sea Urchin-Associated Fungi KMM 4718 and KMM 4747.

The marine-derived fungal strains KMM 4718 and KMM 4747 isolated from sea urchin as a natural fungal complex were identified as and based on Internal Transcribed Spacer (), partial β-tubulin (), and calmodulin () molecular markers as well as an ribosomal polymerase two, subunit two () region for KMM 4747. From the ethyl acetate extract of the co-culture, two new polyketides, sajaroketides A () and B (), together with (2'S)-7-hydroxy-2-(2'-hydroxypropyl)-5-methylchromone (), altechromone A (), norlichexanthone (), griseoxanthone C (), 1,3,5,6-tetrahydroxy-8-methylxanthone (), griseofulvin (), 6-O-desmethylgriseofulvin (), dechlorogriseofulvin (), and 5,6-dihydro-4-methyl-2H-pyran-2-one () were identified. The structures of the compounds were elucidated using spectroscopic analyses.

New Cyclopiane Diterpenes and Polyketide Derivatives from Marine Sediment-Derived Fungus KMM 4670 and Their Biological Activities.

Two new cyclopiane diterpenes and a new cladosporin precursor, together with four known related compounds, were isolated from the marine sediment-derived fungus KMM 4670, which was re-identified based on phylogenetic inference from ITS, , , and gene regions. The absolute stereostructures of the isolated cyclopianes were determined using modified Mosher's method and quantum chemical calculations of the ECD spectra. The isolation from the natural source of two biosynthetic precursors of cladosporin from a natural source has been reported for the first time.

Interplay between magnetic order and electronic band structure in ultrathin GdGe metalloxene films.

Dimensionality can strongly influence the magnetic structure of solid systems. Here, we predict theoretically and confirm experimentally that the antiferromagnetic (AFM) ground state of bulk gadolinium germanide metalloxene, which has a quasi-layered defective GdGe structure, is preserved in the ultrathin film limit. calculations demonstrate that ultrathin GdGe films present in-plane intra-layer ferromagnetic coupling and AFM inter-layer coupling in the ground state.

Dirac points, new photonic band gaps, and effect of magnetically induced transparency in dichroic cholesteric liquid crystals with wavelength-dependent magneto-optical activity parameter.

We investigated the properties of cholesteric liquid crystals (CLCs) being in an external static magnetic field directed along the helix axis. We considered a dichroic CLC, that is, CLC with parameters ReΔ=Reɛ_{1}-Reɛ_{2}/2=0 and ImΔ=Imɛ_{1}-Imɛ_{2}/2≠0, where ɛ_{1,2} are the principal values of the local dielectric permittivity tensor. We have shown that in the case of the wavelength dependence of the magneto-optic activity parameter, new features appear in the optics of dichroic CLCs, in particular, in this case new Dirac points appear.

An SPS-RS Technique for the Fabrication of SrMoO Powellite Mineral-like Ceramics for Sr Immobilization.

This paper reports a method for the fabrication of mineral-like SrMoO ceramics with a powellite structure, which is promising for the immobilization of the high-energy Sr radioisotope. The reported method is based on the solid-phase "in situ" interaction between SrO and MoO oxides initiated under spark plasma sintering (SPS) conditions. Dilatometry, XRD, SEM, and EDX methods were used to investigate the consolidation dynamics, phase formation, and structural changes in the reactive powder blend and sintered ceramics.

Anthraquinone Derivatives and Other Aromatic Compounds from Marine Fungus KMM 4696 and Their Effects against .

New anthraquinone derivatives acruciquinones A-C (-), together with ten known metabolites, were isolated from the obligate marine fungus KMM 4696. Acruciquinone C is the first member of anthraquinone derivatives with a 6/6/5 backbone. The structures of isolated compounds were established based on NMR and MS data.

Microstructure, ion adsorption and magnetic behavior of mesoporous γ-FeO ferrite nanoparticles.

Magnetic nanoparticles with capacity for surface functionalisation have potential applications in water purification and biomedicine. Here, a simple co-precipitation technique was used to synthesize mesoporous ferrite nanoparticles in the presence of cetyltrimethylammonium bromide (CTAB) micellular surfactant. The as-synthesized ferrite nanoparticles were calcined at 250 °C for 5, 10, 15, and 24 h to remove the surfactant and create a mesoporous structure.

Nonuniform Current-Driven Formation and Displacement of the Magnetic Compensation Point in Variable-Width Nanoscale Ferrimagnets.

Nano- and microstructures based on ferrimagnets can demonstrate high efficiency and dynamics of current-induced magnetization switching combined with high stability of spin textures such as bubble domains and skyrmions, which are of practical importance for the development of spintronics and spin-orbitronics. This set of features is usually associated with magnetic momentum or angular momentum compensation states. Here, we experimentally show that the compensation state can be realized locally using nonuniform Joule heating.

Silver nanoparticle-based SERS sensors for sensitive detection of amyloid-β aggregates in biological fluids.

One of the hallmarks of Alzheimer's disease (AD) pathogenesis is the production, aggregation, and deposition of amyloid-β (Aβ) peptide. Surface-enhanced Raman spectroscopy (SERS) is a promising analytical technique capable of providing valuable information on chemical composition and molecule conformations in biological samples. However, one of the main challenges for introducing the SERS technique into the practice is preparation of scalable and at the same time stable nanostructured sensors with uniform spatial distribution of nanoparticles.

New Anti-Hypoxic Metabolites from Co-Culture of Marine-Derived Fungi KMM 4638 and sp. KMM 4639.

The KMM 4639 strain was identified as sp. based on two molecular genetic markers: ITS and β-tubulin regions. Chemical investigation of co-culture marine-derived fungi sp.

Absolute Stereochemistry and Cytotoxic Effects of Vismione E from Marine Sponge-Derived Fungus sp. 1901NT-1.2.2.

The metabolic profile of the sp. 1901NT-1.2.

Crystal structure and electronic properties of low-dimensional hexamethylenediaminium lead halide perovskites.

This work reports on hybrid hexamethylenediaminium lead halide perovskites. The materials were prepared using wet synthesis and the subsequent precipitation from aqueous solution. Structural and morphological charactarization studies show their high degree of crystallinity and phase purity.

New Bioactive β-Resorcylic Acid Derivatives from the Alga-Derived Fungus KMM 4685.

Five new β-resorcylic acid derivatives, 14-hydroxyasperentin B (), β-resoantarctines A-C (, , ) and 8-dehydro-β-resoantarctine A (), together with known 14-hydroxyasperentin (5'-hydroxyasperentin) (), were isolated from the ethyl acetate extract of the fungus KMM 4685 associated with the brown alga . The structures of the compounds were elucidated by spectroscopic analyses and modified Mosher's method, and the biogenetic pathways for compounds - were proposed. For the very first time, the relative configuration of the C-14 center of a known compound was assigned via analyses of magnitudes of the vicinal coupling constants.