Results 61 to 70 of about 531,799 (287)

A JWST Study of the Remarkable Oort Cloud Comet C/2017 K2 (PanSTARRS)

The Planetary Science Journal
Comets, during their journeys into the inner solar system, deliver volatile gases, organics, and particulates into their comae that provide crucial information for assessing the physicochemical conditions in the outer disk from which they formed. Here we
Charles E. Woodward, Dominique Bockélee-Morvan, David E. Harker, Michael S. P. Kelley, Nathan X. Roth, Diane H. Wooden, Stefanie N. Milam   +6 more
doaj   +1 more source

Beyond Charge: Field‐Effect Transistors in Multimodal Biosensing Platforms for Biomolecular Interaction Studies

Advanced Electronic Materials, EarlyView.
This review summarizes the developments in field‐effect transistor (FET)‐based dual‐mode sensor platforms and what can be learned from them. It identifies charge as a crucial factor in biomolecular interactions at interfaces, outlines the challenges of hybrid systems, and highlights their benefits.
Roger Hasler, Ciril Reiner‐Rozman, Christoph Kleber, Jakub Dostalek, Wolfgang Knoll   +4 more
wiley   +1 more source

Lead-induced DNA damage in Vicia faba root cells: Potential involvement of oxidative stress [PDF]

, 2011
Genotoxic effects of lead (0–20 µM) were investigated in whole-plant roots of Vicia faba L., grown hydroponically under controlled conditions. Lead-induced DNA damage in V.
Jean, Séverine, Eric Pinelli, Silvestre, Jérôme, Séverine Jean, Pinelli, Eric, Pourrut, Bertrand, Bertrand Pourrut, Jérôme Silvestre   +7 more
core   +1 more source

Alternative Policy Designs to Help Farmers Select Profitable Conservation Practices

Agribusiness, EarlyView.
ABSTRACT Voluntary private carbon initiatives (VPCIs) promote the implementation of agricultural conservation practices that mitigate emissions of greenhouse gases (GHGs) via financial incentives to participating farmers. Simultaneously, an array of public policies supports the adoption of conservation practices through technical and financial ...
Oranuch Wongpiyabovorn, Alejandro Plastina   +1 more
wiley   +1 more source

Unraveling the Water Sources in Comet 103P/Hartley 2 from Deep Impact Flyby Observations

The Planetary Science Journal
The Deep Impact eXtended Mission flyby of comet 103P/Hartley 2 offered a rare opportunity to study a hyperactive comet with high-cadence and high-resolution observations from a fixed vantage point.
L. M. Feaga, J. M. Sunshine
doaj   +1 more source

Dielectric Elastomer Actuators as Safe and Effective Tools for Mechanostimulation of Human Cells

Advanced Intelligent Systems, EarlyView.
Replicating physiological forces is crucial for realistic cell models. Dielectric elastomer actuators (DEAs) offer a soft alternative, though their high voltages raised toxicity concerns. We demonstrate that DEA stimulation causes no cell damage, cell death or cell‐cycle disruption, while activating mechanosensitive responses.
Simon Holzer, Chaimae Bahou, Noe Syfrig, Katia Monastyrskaya, Yoan Civet, Ali Hashemi Gheinani, Yves Perriard   +6 more
wiley   +1 more source

CO and N2 Produced from H2O, CO2, and NH3 Cometary Ice Analogs

The Astrophysical Journal
Hypervolatile species such as carbon monoxide (CO) and molecular nitrogen (N _2 ) have been detected in comets, and could be used to constrain comet formation temperature conditions if their presence is due to freeze-out and/or entrapment.
Alexandra McKinnon, Alexia Simon, Michelle R. Brann, Elettra L. Piacentino, Karin I. Öberg, Mahesh Rajappan   +5 more
doaj   +1 more source

Austrocedrus from the Late Cretaceous of Antarctica and its implications for the early evolution of southern cypresses (Callitroideae, Cupressaceae)

American Journal of Botany, EarlyView.
Abstract Premise The modern distribution of the southern cypresses, Callitroideae (Cupressaceae), reflects a classic Gondwanan distribution. The initial diversification of Callitroideae is estimated to have occurred during the Cretaceous, yet fossils from this period are rare, hampering our understanding of its early evolutionary history.
Kelly C. Pfeiler, Kelly K. S. Matsunaga, Ana Andruchow‐Colombo, Ari Iglesias, Selena Y. Smith, Brian A. Atkinson   +5 more
wiley   +1 more source

1. The Origin of Comets [PDF]

International Astronomical Union Colloquium, 1977
Empirical data are confronted with different hypotheses on the origin of comets. The hypotheses are classified into three categories: 1) Comets were condensed from the solar nebula and ejected later into the Oort’s cloud. 2) Comets were condensed in situ, more or less recently, on their present trajectories; 3) Reversing the arrow of time in the ...
openaire   +1 more source

The public impact of impacts: How the media play in the mass extinction debates [PDF]

, 2014
“Mass media” presentations of the dinosaurs and their co-inhabitants have been around for some 200 years. The question of what exterminated the dinosaurs and allowed mammals to take their leading place on Earth has a similarly lengthy history in the ...
MILLER, S, Steve Miller
core   +1 more source