Results 1 to 10 of about 1,090,945 (335)

Extinction and morphospace occupation: A critical review

open access: yesCambridge Prisms: Extinction, 2023
Processes of extinction, especially selectivity, can be studied using the distribution of species in morphospace. Random extinction reduces the number of species but has little effect on the range of morphologies or ecological roles in a fauna or flora ...
P. David Polly
doaj   +1 more source

The Sixth Mass Extinction: fact, fiction or speculation?

open access: yesBiological Reviews of The Cambridge Philosophical Society, 2022
There have been five Mass Extinction events in the history of Earth's biodiversity, all caused by dramatic but natural phenomena. It has been claimed that the Sixth Mass Extinction may be underway, this time caused entirely by humans.
R. Cowie, P. Bouchet, B. Fontaine
semanticscholar   +1 more source

Deterministic and stochastic dynamics of a modified Leslie-Gower prey-predator system with simplified Holling-type Ⅳ scheme

open access: yesMathematical Biosciences and Engineering, 2021
In this paper, a prey-predator model with modified Leslie-Gower and simplified Holling-type Ⅳ functional responses is proposed to study the dynamic behaviors.
Lin Li, Wencai Zhao
doaj   +1 more source

Analysis of a stochastic predator-prey system with mixed functional responses and Lévy jumps

open access: yesAIMS Mathematics, 2021
In this paper, we consider a stochastic two predator-one prey system consisting of prey, intermediate predator and top predator with Lévy jumps. Here we consider Ratio-dependent function response between intermediate predator and top predator and other ...
Xuegui Zhang, Yuanfu Shao
doaj   +1 more source

Extinction behavior for a parabolic p-Laplacian equation with gradient source and singular potential

open access: yesAIMS Mathematics, 2022
We concern with the extinction behavior of the solution for a parabolic p-Laplacian equation with gradient source and singular potential. By energy estimate approach, Hardy-Littlewood-Sobolev inequality, a series of ordinary differential inequalities ...
Dengming Liu , Luo Yang
doaj   +1 more source

Neurocircuit differences between memory traces of persistent hypoactivity and freezing following fear conditioning among the amygdala, hippocampus, and prefrontal cortex

open access: yesAIMS Neuroscience, 2021
We aimed to investigate the persistent trace of one traumatic event on neurocircuit controls in rats. Conditioning was reflected by reductions in rates of ‘freezing’ and ‘other-than-freezing’ motor activities, between which rats could alternate on ...
Masatoshi Takita, Yumi Izawa-Sugaya
doaj   +1 more source

Conservation of Colutea gifana, a rare and potential ornamental species, using in vitro method [PDF]

open access: yesJournal of Cell and Molecular Research, 2010
In vitro methods provide a variety of tools to supplement traditional methods for collection, propagation and preservation of endangered plant species. In this study, an efficient protocol was developed for in vitro propagation of Colutea gifana, a rare ...
Mahnaz Kiani   +3 more
doaj   +1 more source

Extinction of cue-evoked food seeking recruits a GABAergic interneuron ensemble in the dorsal medial prefrontal cortex of mice [PDF]

open access: yes, 2020
Animals must quickly adapt food-seeking strategies to locate nutrient sources in dynamically changing environments. Learned associations between food and environmental cues that predict its availability promote food-seeking behaviors.
Brebner, Leonie S   +9 more
core   +2 more sources

Correcting for the Effects of Interstellar Extinction [PDF]

open access: yes, 1998
This paper addresses the issue of how best to correct astronomical data for the wavelength‐dependent effects of Galactic interstellar extinction. The main general features of extinction from the IR through the UV are reviewed, along with the nature of ...
E. Fitzpatrick
semanticscholar   +1 more source

On the basic reproduction number in semi-Markov switching networks

open access: yesJournal of Biological Dynamics, 2021
Basic reproduction number $ \mathcal {R}_0 $ in network epidemic dynamics is studied in the case of stochastic regime-switching networks. For generality, the dependence between successive networks is considered to follow a continuous time semi-Markov ...
Xiaochun Cao   +3 more
doaj   +1 more source

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