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An Aluminum-Stabilized Aminonitrene
Knowledge, attitudes, and practices toward insulin treatment among patients with type 2 diabetes: a structural modeling study
Class of Cross-Linkers That Self-Extract via Thermodynamically Driven Phase Transfer for Energy-Efficient Recycling
Abiotic polycyclic aromatic hydrocarbons originating from the sub-oceanic mantle
Abstract Experimental studies have demonstrated that petroleum may form from abiotic organic compounds synthesised in the Earth’s upper mantle. However, the most direct evidence of mantle-derived organics, as obtained from whole-rock analyses, indicates ambiguous origins. Although inclusions containing organic matter have been reported in minerals from kimberlite pipes, such occurrences have not previously been documented in mantle xenoliths derived from the sub-oceanic upper mantle, which represent the predominant lithology of the Earth’s upper mantle. In this study, we identified polycyclic aromatic hydrocarbons (PAHs)-bearing melt inclusions within a spinel-bearing unaltered harzburgite xenolith from Tahiti Island. The inclusions consisted of platinum-group minerals, base metal sulphides, silicate glass, and C–O–H phases. Our comprehensive sub-micrometre-scale analyses revealed the presence of PAHs in the C–O–H phases. These PAHs contained few functional groups or aliphatic chains and coexisted with CO and CO₂. They likely formed under reducing conditions in deeper regions of the upper mantle without serpentinisation. Our findings demonstrate abiotic organic matter formation in the sub-oceanic mantle and suggest widespread abiotic organic synthesis in the sub-oceanic mantle.
Eye Movement-Related Eardrum Oscillations (EMREOs) Occur without Visual Input But Are Reduced during Closed Eyelids
Recent investigations have shown that the tympanic membranes exhibit synchronous oscillations with each saccadic eye movement (Gruters et al., 2018), a phenomenon known as eye movement-related eardrum oscillations (EMREOs). However, the dependence of these saccade-associated EMREOs on ongoing visual activity remains to be elucidated. Given the direct projections from motor areas to primary auditory and visual cortices and the observation that EMREOs’ onset occurs concurrently with, or even precedes, saccades, we hypothesized that EMREOs would persist in the absence of visual stimulation. This report presents a study wherein 16 healthy male and female participants executed horizontal saccades under three distinct conditions: (1) in a well-lit environment, (2) in a darkened environment with eyes open, and (3) in a darkened environment with eyes closed. Ocular movements were quantified via electrooculography, and tympanic membrane oscillations were registered using in-ear microphones. The results demonstrated the presence of EMREOs concurrent with both visually guided and memory-guided saccades, although a late minor reduction in amplitude was observed in the “dark with open eyes” condition. Significant attenuation of EMREOs was evident when participants performed saccades with their eyelids closed, despite maintaining the same saccade amplitude and initial velocity. This amplitude reduction may reflect modulations in cortical states associated with predictive coding.
Spin Polarization by Magnetic Proximity Enhances Electron Transport in Catalysts
On machine learning based QSPR analysis of amphetamine derivatives using regression models
Thermodynamic vs Kinetic Control of the Oxygen Reduction Reaction with Iron and Cobalt Porphyrin Atropisomers
A neural network framework for selecting real-time video enhancement algorithms on mobile devices
Optimal Inhibitory-to-Excitatory Ratio Governs Slow and Fast Oscillations for Enhanced Neural Communication
Neural oscillations at distinct frequency bands facilitate communication within and between neural populations. While single-frequency oscillations are well-characterized, the simultaneous emergence of slow (beta) and fast (gamma) oscillations within the same network remains unclear. Here, we demonstrate that multi-frequency oscillations naturally arise when the ratio of inhibitory-to-excitatory synaptic strength falls within a specific regime using a biologically plausible Izhikevich model. We show that this regime maximizes both information capacity and transmission efficiency, suggesting an optimal balance for neural communication. Deviations from this range lead to single-frequency oscillations and reduced communication efficiency, mirroring disruptions observed in neurological disorders. These findings provide mechanistic insight into how the brain leverages multiple oscillatory frequencies for efficient information processing and suggest a potential biomarker for impaired neural communication.
Electrochemical Hydrogenation of Aza-Arenes Using H <sub>2</sub> O as H Source
Fuzzy energy management using a chaotic model to improve fuel consumption of fuel cell-battery hybrid fixed-wing UAVs operating under uncertainty control
Modular Total Synthesis of Lasalocid Acid A through Direct C(sp <sup>3</sup> )–C(sp <sup>3</sup> ) Attached Ring Construction
Sarilumab in the management of Graves orbitopathy with low clinical activity scores
Effects of Novelty and Temporal Distance on Postexperience Spike Patterns of Hippocampal Place Cells Encoding Multiple Environments
The hippocampus plays a crucial role in consolidating episodic memories from diverse experiences that encompass spatial, temporal, and novel information. This study analyzed the spike patterns of hippocampal place cells in the CA3 and CA1 areas of male rats that sequentially foraged in five rooms, including familiar and novel rooms, followed by a rest period. Across the five rooms, both CA3 and CA1 place cells showed overlapping spatial representations. In a postexperience rest period, both CA3 and CA1 place cells increased baseline spike rates depending on the temporal distance from when the cells had place fields. In addition, CA3 place cells that encoded novel environments showed stronger sharp-wave ripple (SWR) reactivation. Coordinated reactivation of CA1 place cell ensembles that encoded temporally distant environments was eliminated. These results suggest that, following sequential experiences in multiple environments, increases in SWR-induced spikes of hippocampal neurons more specifically process novelty-related aspects of memory, while global increases in baseline spike rates process temporal distance-related aspects.
Construction of Well-Defined Yet Adaptable Oligo(Amino Acid) Cavities within an Aromatic Micelle
Evaluation of the cardiopulmonary effects of repurposed COVID-19 therapeutics in healthy rats
DMT-Induced Shifts in Criticality Correlate with Self-Dissolution
Psychedelics profoundly alter subjective experience and brain dynamics. Brain oscillations express signatures of near-critical dynamics, relevant for healthy function. Alterations in the proximity to criticality have been suggested to underlie the experiential and neurological effects of psychedelics. Here, we investigate the effects of a psychedelic substance (DMT) on the criticality of brain oscillations, and in relation to subjective experience, in humans of either sex. We find that DMT shifts the dynamics of brain oscillations away from criticality in alpha and adjacent frequency bands. In this context, entropy is increased while complexity is reduced. We find that the criticality-shifts observed in alpha and theta bands correlate with the intensity ratings of self-dissolution, a hallmark of psychedelic experience. Finally, using a recently developed metric, the functional excitatory-inhibitory ratio, we find that the DMT-induced criticality-shift in brain oscillations is toward subcritical regimes. These findings have major implications for the neuronal understanding of the self and psychedelics, as well as for the neurological basis of altered states of consciousness.