Exploring Moiré Superlattices and Memristive Switching in Non-van der Waals Twisted Bilayer BiOSe.

The discovery of moiré physics in two-dimensional (2D) materials has opened new avenues for exploring unique physical and chemical properties induced by intralayer/interlayer interactions. This study reports the experimental observation of moiré patterns in 2D bismuth oxyselenide (BiOSe) nanosheets grown through one-pot chemical reaction methods and a sonication-assisted layer separations technique. Our findings demonstrate that these moiré patterns result from the angular stacking of the nanosheets at various twist angles, leading to the formation of moiré superlattices (MSLs) with distinct periodicities.

Rapid Assembly of 1,3-Dicarbonyl Fused 5-phenyl-1-Azabicyclo[3.1.0]hexanes and Their Cytotoxic Activities.

Synthesis of complex, multiring, spirocyclic, 1,3-dicarbonyl fused, and highly functionalized 5-phenyl-1-azabicyclo[3.1.0]hexanes (ABCH) has been achieved by an intermolecular reaction of 2-(2'-ketoalkyl)-1,3-indandiones or α,γ-diketo esters with (1-azidovinyl)benzenes under transition metal-free conditions.

The association of temperature extremes, ecosystem resilience, with child mortality: Novel evidence from India.

The present study investigates how ecosystem resilience affects children's health and acts as a protective shield against high temperature exposure. Ecosystem resilience is the ability of an ecosystem to absorb anthropogenic or climatic shocks and recover from those shocks. The study used various data sources to estimate the impact of temperature extremes on child mortality in India.

Tunable SIM properties in a family of 3D anilato-based lanthanide-MOFs.

By reacting a 3,6-ditriazolyl-2,5-dihydroxybenzoquinone (HtrzAn) anilato linker with Ln ions (Ln = Dy, Tb, Ho), two different series of polymorphs, formulated as [Ln(trzAn)(HO)] ·10HO (Dy, 1a; Tb, 2a, Ho, 3a) and [Ln(trzAn)(HO)] ·7HO (Dy, 1b, Tb, 2b, Ho, 3b) have been obtained. In these series the two Dy-coordination networks (1a and 1b) and the Tb-coordination polymer (2b) show a Single Ion Magnet (SIM) behavior. 1-3a MOFs show reversible structural flexibility upon removal of a coordinated water molecule from a distorted hexagonal 2D framework to a distorted 3,6-brickwall rectangular 3D structure in [Ln(trzAn)(HO)] ·2HO (Dy, 1a_des; Tb, 2a_des, Ho, 3a_des) involving shrinkage/expansion of the hexagonal-rectangular networks.

Translational symmetry in convolutions with localized kernels causes an implicit bias toward high frequency adversarial examples.

Adversarial attacks are still a significant challenge for neural networks. Recent efforts have shown that adversarial perturbations typically contain high-frequency features, but the root cause of this phenomenon remains unknown. Inspired by theoretical work on linear convolutional models, we hypothesize that together with , and that this is one of the main causes of .

Towards molecular controlled magnonics.

Magnonics is an emerging field broadly recognized as a paradigm shift for information technologies based on the use of spin waves. However, the low flexibility and variety of the existing systems still hamper their applications. Herein, we propose an unprecedented chemical approach to magnonics based on the creation of hybrid molecular/2D heterostructures.

Unravelling the role of spin-vibrational coupling in designing high-performance pentagonal bipyramidal Dy(iii) single ion magnets.

At the cutting edge of high-performance single-molecule magnets (SMMs) lie lanthanide-based complexes, renowned for their potent magnetic anisotropy. SMMs containing one metal centre are defined as single-ion magnets (SIMs). The performance of SMMs is measured generally the barrier height for magnetisation reversal () and blocking temperature (), below which the magnetisation is fully frozen.

Magnetic anisotropy in octahedral Dy(III) and Yb(III) complexes.

New organophosphate complexes [, (Ln = Dy, Yb and Y; dippH = 2,6-diisopropylphenyl phosphate), displaying octahedral coordination geometry around the metal ion, exhibit unusual slow relaxation of magnetisation, which is investigated through experimental studies and CASSCF calculations.

Core-ionization spectrum of liquid water.

We present state-of-the-art calculations of the core-ionization spectrum of water. Despite significant progress in procedures developed to mitigate various experimental complications and uncertainties, the experimental determination of ionization energies of solvated species involves several non-trivial steps such as assessing the effect of the surface potential, electrolytes, and finite escape depths of photoelectrons. This provides a motivation to obtain robust theoretical values of the intrinsic bulk ionization energy and the corresponding solvent-induced shift.

Total Synthesis, Revised Structure, and Biological Evaluation of Elgonene B and Analogues.

Herein, we report the first total synthesis of elgonene B and its congeners, thus resulting in a revision of the configuration at the C-6 carbon of the originally proposed structure of elgonene B. This synthetic approach demonstrates the utility of several important reactions such as the chiral oxazaborolidinium ion-catalyzed Diels-Alder reaction, Ando's Horner-Wadsworth-Emmons olefination, and the intermolecular Nozaki-Hiyama-Kishi reaction as key steps. Additionally, the study explores the cytotoxic and antibacterial activities of elgonene B and its congeners (-).

Phytoconstituents from (stinging nettle) of Sikkim Himalaya and their molecular docking interactions revealed their nutraceutical potential as α-amylase and α-glucosidase inhibitors.

In this study, antioxidative methanolic leaf extract (MeOH-SIS) of was characterized for anti-diabetic activity. The extract was purified on a column to yield seven homogenous fractions (F1-F7) which were further determined for DPPH radical scavenging activity. MeOH-SIS and the fraction F1 (selected based on % yield and activity) were evaluated for their in vitro α-amylase and α-glucosidase inhibitory activity.

Field-induced SIM behaviour in early lanthanide(III) organophosphates containing 18-crown-6.

Single-ion magnets (SIMs) have attracted wide attention in recent years. Despite tremendous progress in late lanthanide SIMs, reports on early lanthanides exhibiting SIM characteristics are scarce. A series of five novel 18-crown-6 encapsulated mononuclear early lanthanide(III) organophosphates, [{(18-crown-6)Ln(dippH)}{(18-crown-6)Ln(dippH)(dippH)}]·[I] [Ln = Ce (1), Pr (2), Nd (3)] and [{Ln(18-crown-6)(dippH)(HO)}·{I}] [Ln = Sm (4) and Eu (5)], have been synthesised in the present study.

Pushing the Boundary of Covalency in Lanthanoid-Tellurium Bonds: Insights from the Synthesis, Molecular and Electronic Structures of Low-Coordinate, Monomeric Europium(II) and Ytterbium(II) Tellurolates.

Owing to the strict hard/soft dichotomy between the lanthanoids and tellurium atoms, and the strong affinity of lanthanoid ions for high coordination numbers, low-coordinate, monomeric lanthanoid tellurolate complexes have remained elusive as compared to the lanthanoid complexes with lighter group 16 elements (O, S, and Se). This makes the development of suitable ligand systems for low-coordinate, monomeric lanthanoid tellurolate complexes an appealing endeavor. In a first report, a series of low-coordinate, monomeric lanthanoid (Yb, Eu) tellurolate complexes were synthesized by utilizing hybrid organotellurolate ligands containing N-donor pendant arms.

Long Non-coding RNAs, Lnc RNA Metabolism to Cancer Biology.

The eukaryotic genome is represented by a vast proportion of non-coding regions, which in recent years have been attributed to have important functional roles in gene regulation through a myriad of processes, ranging from proper localization, correct folding and, most importantly, spatial and temporally regulated expression of genes. One of the major contributing factors in these processes is ribonucleic acid (RNA) metabolism, which comprises the RNA-nucleoprotein (RNP) complexes that interact with and instruct the genome to function. Long non-coding RNAs are an integral component of several RNPs, and herein we provide an overview of the understanding of the long non-coding RNAs, their characteristics, their function and their balancing act as dual modulators in cancer manifestation and progression.

Experimental and theoretical investigations on three Dy single molecule magnets: structural and magneto-structural correlations.

The work in this report describes the syntheses, crystal structures, dc/ac magnetic behaviour, and theoretical calculations (both CASSCF and DFT) of three defect dicubane/planar butterfly type tetradysprosium(III) compounds of compositions [DyL(μ-OH)(carboxylate)(dmf)] (carboxylate = formate (1), acetate (2), propionate (3)), where HL = 2-(2-hydroxy-3-ethoxybenzylideneamino)phenol. In the butterfly type structures, two Dy centres (Dy) occupy the body positions while two other (Dy) units occupy the wing positions. SHAPE analyses reveal that the coordination geometries of the Dy and Dy centres, both octacoordinated, are triangular dodecahedron (TDD) and square antiprism (SAPR), respectively.

Analysis of the Magnetic Coupling in a Mn(II)-U(V)-Mn(II) Single Molecule Magnet.

[{Mn(TPA)I}{UO2(Mesaldien)}{Mn(TPA)I}]I formula (here TPA=tris(2-pyridylmethyl)amine and Mesaldien=N,N'-(2-aminomethyl)diethylenebis(salicylidene imine)) reported by Mazzanti and coworkers (Chatelain et al. Angew. Chem.

Whole genome sequencing and comparative genomic analyses of Pseudomonas aeruginosa strain isolated from arable soil reveal novel insights into heavy metal resistance and codon biology.

Elevated concentration of non-essential persistent heavy metals and metalloids in the soil is detrimental to essential soil microbes and plants, resulting in diminished diversity and biomass. Thus, isolation, screening, and whole genomic analysis of potent strains of bacteria from arable lands with inherent capabilities of heavy metal resistance and plant growth promotion hold the key for bio remedial applications. This study is an attempt to do the same.

design criteria for high blocking barrier uranium (III) SIMs.

A combination of DFT and CASSCF/PT2 calculations on U(III) fictitious models and numerous reported X-ray structures unveils several geometries from coordination number 1 to 12 that can be targeted to design potential U(III) SIMs with attractive barrier heights. Among the geometries studied, the T-shaped and capped pentagonal antiprism geometries yield values exceeding 1500 cm - a value that is elusive for any uranium SIMs.

Convenient one-pot synthesis of 1,2,4-oxadiazoles and 2,4,6-triarylpyridines using graphene oxide (GO) as a metal-free catalyst: importance of dual catalytic activity.

A convenient and efficient process for the synthesis of 3,5-disubstituted 1,2,4-oxadiazoles and 2,4,6-triarylpyridines has been described using an inexpensive, environmentally benign, metal-free heterogeneous carbocatalyst, graphene oxide (GO). GO plays a dual role of an oxidizing agent and solid acid catalyst for synthesizing 1,2,4-oxadiazoles and triarylpyridines. This dual catalytic activity of GO is due to the presence of oxygenated functional groups which are distributed on the nanosheets of graphene oxide.

Detection of SARS-CoV-2 RNA Using a DNA Aptamer Mimic of Green Fluorescent Protein.

RNA detection is important in diverse diagnostic and analytical applications. RNAs can be rapidly detected using molecular beacons, which fluoresce upon hybridizing to a target RNA but require oligonucleotides with complex fluorescent dye and quencher conjugations. Here, we describe a simplified method for rapid fluorescence detection of a target RNA using simple unmodified DNA oligonucleotides.

Deciphering the Role of Symmetry and Ligand Field in Designing Three-Coordinate Uranium and Plutonium Single-Molecule Magnets.

Actinide single-molecule magnets (SMMs) have gained paramount interest in molecular magnetism as they offer a larger barrier height of magnetization () reversal compared to the lanthanide analogue, thanks to their greater metal-ligand covalency. However, the reported actinide SMMs to date yield a relatively smaller as there is no established design principle to enhance values. To address this issue, we have employed CASSCF/CASPT2/NEVPT2 calculations to study a series of three-coordinate U and Pu SMMs.

The fluorescent aptamer Squash extensively repurposes the adenine riboswitch fold.

Squash is an RNA aptamer that strongly activates the fluorescence of small-molecule analogs of the fluorophore of green fluorescent protein (GFP). Unlike other fluorogenic aptamers, isolated de novo from random-sequence RNA, Squash was evolved from the bacterial adenine riboswitch to leverage its optimized in vivo folding and stability. We now report the 2.

Repurposing an adenine riboswitch into a fluorogenic imaging and sensing tag.

Fluorogenic RNA aptamers are used to genetically encode fluorescent RNA and to construct RNA-based metabolite sensors. Unlike naturally occurring aptamers that efficiently fold and undergo metabolite-induced conformational changes, fluorogenic aptamers can exhibit poor folding, which limits their cellular fluorescence. To overcome this, we evolved a naturally occurring well-folded adenine riboswitch into a fluorogenic aptamer.