Results 131 to 140 of about 3,161,795 (320)
The Heumann-Hotzel model for aging revisited
, 2001 Since its proposition in 1995, the Heumann-Hotzel model has remained as an obscure model of biological aging. The main arguments used against it were its apparent inability to describe populations with many age intervals and its failure to prevent a ...
A. Kowald +20 more
core +1 more source
Advanced Photonics Research, EarlyView.This study demonstrates a label‐free optical method to monitor cells using a terahertz metasurface‐based biosensing platform. The obtained terahertz signal change for the cell‐contained nanoslots before and after external stimulus is analyzed in terms of transmittance and frequency shift, dynamically representing the cell apoptosis process.
Yeeun Roh +4 more
wiley +1 more source
Extinction risk of threatened and non-threatened mosses: Reproductive and ecological patterns
Global Ecology and Conservation, 2022 For the conservation of species, it is crucial to predict extinction risk by discerning drivers such as biological traits and habitat specificity within the current context of environmental change.
Juan Antonio Calleja +5 more
doaj
Simulation and Experiment of Extinction or Adaptation [PDF]
arXiv, 2004 Can unicellular organisms survive a drastic temperature change, and adapt to it after many generations? In simulations of the Penna model of biological ageing, both extinction and adaptation were found for asexual and sexual reproduction as well as for parasex.
arxiv
Advanced Photonics Research, EarlyView.Optical wireless communications (OWCs) provide a promising alternative to spectrum‐congested microwave wireless communications. Recently, the use of metasurfaces with sub‐wavelength features for dynamic beam steering, beam manipulation, and spatial or optical‐angular‐momentum mode generation, conversion, and multiplexing in OWCs is proposed and ...
Ke Wang +7 more
wiley +1 more source
Environmental restoration and biological contamination: ecological and legal aspects [PDF]
Biotemas, 2005 Environmental restoration is a pressing current need. However, protected areas have been exposed to biological contamination risks because the traditional techniques of restoration frequently use exotic species. This causes some concern, since biological
Ademir Reis +3 more
doaj
Determining species expansion and extinction possibilities using probabilistic and graphical models
Ekológia (Bratislava), 2015 Survival of plant species is governed by a number of functions. The participation of each function in species survival and the impact of the contrary behaviour of the species vary from function to function. The probability of extinction of species varies
Chaturvedi Rajesh +1 more
doaj +1 more source
Frontiers in Behavioral Neuroscience, 2019 Opioid use is a widespread epidemic, and traumatic stress exposure is a critical risk factor in opioid use and relapse. There is a significant gap in our understanding of how stress contributes to heroin use, and there are limited studies investigating ...
Nathaniel P. Stafford +5 more
doaj +1 more source
Double Mass Extinctions and the Volcanogenic Dark Matter Scenario [PDF]
arXiv, 1998 A few of the major mass extinctions of paleontology have recently been found to consist of two distinct extinction peaks at higher resolution. A viable explanation for this remains elusive. In this paper it is shown that the recently proposed volcanogenic dark matter model can explain this puzzling characteristic of these extinctions.
arxiv
Advanced Sensor Research, EarlyView.Fast response, zero‐power, text or image sensors utilizing light transmission or reflection, and no unfavorable color change judgments, are fabricated using printed nematic liquid crystals patterned on reactive alignment layers, permit ppt‐ to ppb‐level sensitivity, and were field‐tested with active firefighters.
Ryan A. Williams +9 more
wiley +1 more source