Results 21 to 30 of about 215 (139)

Individual variability shapes interaction rewiring and fosters ecosystem restoration by reintroduced giant tortoises in the Seychelles

Restoration Ecology, Volume 34, Issue 4, May 2026.
Abstract Introduction Giant tortoises are critical for restoring lost ecological interactions on islands. Following their extinction in Seychelles centuries ago, key ecosystem processes like seed dispersal, browsing, and nutrient cycling were disrupted.
Iago Ferreiro‐Arias, Sergio García‐Peña, Christopher Kaiser‐Bunbury, Pablo Vargas   +3 more
wiley   +1 more source

Neuronal Dynamics of an Intrinsically Bursting Neuron Through the Caputo–Fabrizio Fractal–Fractional Hodgkin–Huxley Model

International Journal of Differential Equations, Volume 2026, Issue 1, 2026.
This study introduces a novel fractal–fractional extension of the Hodgkin–Huxley model to capture complex neuronal dynamics, with particular focus on intrinsically bursting patterns. The key innovation lies in the simultaneous incorporation of Caputo–Fabrizio operators with fractional order α for memory effects and fractal dimension τ for temporal ...
M. J. Islam, M. J. Abedin, A. Hoque, M. G. Hafez, Jaume Giné   +4 more
wiley   +1 more source

ALMA’s Acute View of pPNe: Through the Magnifying Glass... and What We Found There

Galaxies, 2018
We present recent Atacama Large Millimeter/submillimeter Array (ALMA)-based studies of circumstellar envelopes (CSEs) around Asymptotic Giant Branch (AGB) stars and pre-Planetary Nebulae (pPNe).
Carmen Sánchez Contreras, Javier Alcolea, Valentín Bujarrabal, Arancha Castro-Carrizo   +3 more
doaj   +1 more source

Ba Enrichment in Gaia MS+WD Binaries: Tracing s-process Element Production

The Astrophysical Journal Letters
A large population of intermediate-separation binaries, consisting of a main-sequence (MS) star and a white dwarf (WD), recently emerged from Gaia’s third data release (DR3), posing challenges to current models of binary evolution. Here we examine the s -
Param Rekhi, Sagi Ben-Ami, Na’ama Hallakoun, Sahar Shahaf, Silvia Toonen, Hans-Walter Rix   +5 more
doaj   +1 more source

Interstellar Comets from Post-main-sequence Systems as Tracers of Extrasolar Oort Clouds

The Planetary Science Journal, 2023
Interstellar small bodies are unique probes into the histories of exoplanetary systems. One hypothesized class of interlopers are “Jurads,” exocomets released into the Milky Way during the post-main-sequence as the thermally pulsing asymptotic giant ...
W. Garrett Levine, Aster G. Taylor, Darryl Z. Seligman, Devin J. Hoover, Robert Jedicke, Jennifer B. Bergner, Gregory P. Laughlin   +6 more
doaj   +1 more source

Edge of Chaos Theory Unveils the First and Simplest Ever Reported Hodgkin–Huxley Neuristor

Advanced Electronic Materials, Volume 11, Issue 8, June 2025.
This manuscript presents the first and simplest ever‐reported electrical cell, which leverages one memristor on Edge of Chaos to reproduce the three‐bifurcation cascade, marking the entire life cycle from birth to extinction via All‐to‐None effect of an electrical spike, also referred to as Action Potential, across axon membranes under monotonic ...
Alon Ascoli, Ahmet Samil Demirkol, Ioannis Messaris, Vasilis Ntinas, Dimitris Prousalis, Stefan Slesazeck, Thomas Mikolajick, Fernando Corinto, Michele Bonnin, Marco Gilli, Pier Paolo Civalleri, Ronald Tetzlaff, Leon Chua   +12 more
wiley   +1 more source

Episodes of Molecular Emission in the Optical Spectrum of IRAS 22272+5435

The Astrophysical Journal, 2023
Emission of carbon-bearing molecular lines in multiple optical spectra of IRAS 22272+5435 from 2015 to 2017 is detected, and, for the first time in post–asymptotic giant branch stars, real-time evolution of these features is observed. Specifically, lines
Kārlis Puķı̄tis, Laimons Začs, Julius Sperauskas   +2 more
doaj   +1 more source

The Radio Wave Polarization of Saturn Lightning Observed by Cassini

Journal of Geophysical Research: Space Physics, Volume 130, Issue 6, June 2025.
Abstract We investigate the polarization of the radio waves emitted by lightning in Saturn's atmosphere, which are referred to as SEDs for Saturn Electrostatic Discharges. Using the complete SED data set retrieved by Cassini's RPWS (Radio and Plasma Wave Science) instrument we found that the circular polarization of SEDs below a frequency of 2 MHz ...
G. Fischer, M. Imai, U. Taubenschuss, D. Píša, W. S. Kurth   +4 more
wiley   +1 more source

Study of Neutron Capture Nucleosynthesis Based on Post–Asymptotic Giant Branch Stars

The Astrophysical Journal
The intermediate neutron-capture process ( i -process) may occur during proton ingestion events, with post–asymptotic giant branch (AGB) stars considered among its potential astrophysical sites.
Miao Tian, Wenyuan Cui, Jian-Rong Shi, Jin-Xiao Qin, Hongjie Li, Fang Wen, Zhenyan Huo   +6 more
doaj   +1 more source

Of Biogeography, Fishes and Kelp: Environmental DNA Metabarcoding the Great African Seaforest

Diversity and Distributions, Volume 31, Issue 6, June 2025.
ABSTRACT Aim The biodiversity associated with kelp forest ecosystems is understudied globally, including in South Africa, where kelp forests have expanded their range under climate change. This study used environmental DNA (eDNA) metabarcoding to assess fish biodiversity across an expansive range (~1000 km) of South Africa's kelp forests, contributing ...
Kira‐Lee Courtaillac, Jannes Landschoff, Sophie von der Heyden   +2 more
wiley   +1 more source