Results 71 to 80 of about 1,122,223 (383)

Multiple Anthropogenic Pressures Lead to Seed Dispersal Collapse of the Southernmost Palm Jubaea chilensis

Frontiers in Ecology and Evolution, 2021
Seed dispersal is a critical process for plant reproduction and regeneration. Successful recruitment depends on pre- and post-dispersal processes that complete a seed’s journey until becoming a new plant.
Sebastián Cordero, Francisca Gálvez, Francisco E. Fontúrbel   +2 more
doaj   +1 more source

Lifting the Dusty Veil II: A Large-Scale Study of the Galactic Infrared Extinction Law

, 2009
We combine near-infrared (2MASS) and mid-infrared (Spitzer-IRAC) photometry to characterize the IR extinction law (1.2-8 microns) over nearly 150 degrees of contiguous Milky Way midplane longitude.
B. A. Whitney, B. Babler, C. Watson, Chapman, D. L. Nidever, Drimmel, E. Churchwell, Flaherty, G. Zasowski, Indebetouw, Jackson, Li, Lutz, M. F. Skrutskie, M. R. Meade, Madsen, McClure, Nishiyama, Nishiyama, Pineda, R. Indebetouw, R. J. Patterson, Román-Zúñiga, Rosenthal, S. R. Majewski, Skrutskie, Speck, Weingartner, Whittet, Zhukovska   +29 more
core   +1 more source

Survival of small populations under demographic stochasticity [PDF]

, 1992
We estimate the mean time to extinction of small populations in an environment with constant carrying capacity but under stochastic demography. In particular, we investigate the interaction of stochastic variation in fecundity and sex ratio under several
Bell, Cohen, Ewens, Feller, Gabriel, Goodman, Hassel, Kemeny, Lande, Leigh, Lynch, MacArthur, May, May, Maynard Smith, Milton, Mode, Mode, Reinhard Bürger, Richter-Dyn, Strebel, Tuljapurkar, Tuljapurkar, Wilfried Gabriel, Wright   +24 more
core   +1 more source

Is extinction forever? [PDF]

Public Understanding of Science, 2015
Mistrust of science has seeped into public perception of the most fundamental aspect of conservation— extinction. The term ought to be straightforward, and yet, there is a disconnect between scientific discussion and public views. This is not a mere semantic issue, rather one of communication. Within a population dynamics context, we say that a species
Smith-Patten, Brenda D., Bridge, Eli S., Crawford, Priscilla H. C., Hough, Daniel J., Kelly, Jeffrey F., Patten, Michael A.   +5 more
openaire   +4 more sources

Linked dimers of the AAA+ ATPase Msp1 reveal energetic demands and mechanistic plasticity for substrate extraction from lipid bilayers

FEBS Letters, EarlyView.
Cells must clear mislocalized or faulty proteins from membranes to survive. The AAA+ ATPase Msp1 performs this task, but dissecting how its six subunits work together is challenging. We engineered linked dimers with varied numbers of functional subunits to reveal how Msp1 subunits cooperate and use energy to extract proteins from the lipid bilayer ...
Deepika Gaur, Brian Acquaviva, Baylee A. Smith, Nathan Walker, Isabella Walter, Matthew L. Wohlever   +5 more
wiley   +1 more source

A Mobile Phone App for the Generation and Characterization of Motor Habits

Frontiers in Psychology, 2020
Habits are a powerful route to efficiency; the ability to constantly shift between goal-directed and habitual strategies, as well as integrate them into behavioral output, is key to optimal performance in everyday life.
Paula Banca, Daniel McNamee, Daniel McNamee, Thomas Piercy, Qiang Luo, Qiang Luo, Qiang Luo, Trevor W. Robbins   +7 more
doaj   +1 more source

Extinction properties of the X-ray bright/optically faint afterglow of GRB 020405

, 2005
We present an optical-to-X-ray spectral analysis of the afterglow of GRB 020405. The optical spectral energy distribution not corrected for the extragalactic extinction is significantly below the X-ray extrapolation of the single powerlaw spectral model ...
Antonelli, L. A., Conciatore, M. L., Fiore, F., Lazzati, D., Perna, R., Stratta, G.   +5 more
core   +1 more source

The fate of the homoctenids (Tentaculitoidea) during the Frasnian-Famennian mass extinction (Late Devonian) [PDF]

, 2006
The homoctenids (Tentaculitoidea) are small, conical-shelled marine animals which are amongst the most abundant and widespread of all Late Devonian fossils.
Alberti GKB, Babin C, Becker RT, Blumenstengel H, Bond DPG, Boueek B, Buggisch W, Dzik J, Farsan NM, Feist R, Fisher DW, Freyer G, Grabau AW, Hajlasz B, Hallam A, Jansen U, Klapper G, Lardeux H, Li YX, Li YX, Ludvigsen R, Lutke F, Lyashenko GP, Lyashenko GP, Lyashenko GP, Lyashenko GP, McLaren DJ, Morrow JR, Over DJ, Racki G, Racki G, Raup DM, Roemer FA, Ruchholz K, Sandberg CA, Sandberg CA, Sauerland U, Schindler E, Scotese CR, Sepkoski JJ, Sherrard K, Truyols-Massoni M, Tunnicliff SP, Walliser OH, Walliser OH, Weedon MJ, Yochelson EL, Zagora K, Zhang R   +48 more
core   +1 more source

An efficient strategy for producing RNA‐free Nucleocapsid protein of SARS‐CoV‐2 for biochemical and structural investigations

FEBS Open Bio, EarlyView.
Cleavable N‐terminal Thioredoxin fusion enabled soluble expression and purification of otherwise insoluble SARS‐CoV‐2 Nucleocapsid (N) protein. A four‐step purification strategy yielded highly homogeneous, RNA‐free N protein. Binding assays showed high RNA affinity (Kd ~ 28 nm). The study will facilitate high‐resolution structural studies of N protein,
Shweta Singh, Gagan D. Gupta
wiley   +1 more source

Increased perceived self-efficacy facilitates the extinction of fear in healthy participants

Frontiers in Behavioral Neuroscience, 2015
Self-efficacy has been proposed as an important element of a successful cognitive behavioral treatment. Positive changes in perceived self-efficacy have been linked to an improved adaptive emotional and behavioral responding in the context of anxiety ...
Armin eZlomuzica, Friederike ePreusser, Silvia eSchneider, Jürgen eMargraf   +3 more
doaj   +1 more source