Results 61 to 70 of about 2,307 (223)
Vestigial Plastids in Parasitic Plants: Evolutionary Remnants or Adaptive Innovations?
Plant, Cell &Environment, EarlyView.ABSTRACT Throughout the evolutionary history of plants, chloroplasts originating from a cyanobacterial endosymbiosis have undergone remarkable adaptation and specialization, giving rise to a multitude of plastid types. The evolution toward parasitism in plants represents a particularly extreme case of such specialization.
Laia Jené, Sergi Munné‐Bosch
wiley +1 more source
Quantum Gravity: Has Spacetime Quantum Properties? [PDF]
, 2009 The conceptual incompatibility between General Relativity and Quantum Mechanics is generally seen as a sufficient motivation for the development of a theory of Quantum Gravity. If - so a typical argumentation - Quantum Mechanics gives a universally valid
Hedrich, Reiner
core
Experience and Time: A Metaphysical Approach
Analytic Philosophy, EarlyView.ABSTRACT What is the temporal structure of conscious experience? While it is popular to think that our most basic conscious experiences are temporally extended, we will be arguing against this view, on the grounds that it makes our conscious experiences depend on the future in an implausible way.
David Builes +1 more
wiley +1 more source
Quantum Gravity: A Primer for Philosophers. [PDF]
, 2008 ‘Quantum Gravity’ does not denote any existing theory: the field of quantum gravity is very much a ‘work in progress’. As you will see in this chapter, there are multiple lines of attack each with the same core goal: to find a theory that unifies, in ...
Rickles, Dean
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Renaissance Studies, EarlyView.Abstract Pedro de Ayala served as a diplomat for King Ferdinand II of Aragon and Queen Isabella I of Castile at the courts of Henry VII, King of England, and James IV, King of Scots. In July 1498, he wrote a letter, partly in cipher, to report to his king and queen on such matters as Spain's interests in international diplomacy; the characters and ...
Adrian William Jaime +2 more
wiley +1 more source
On the Emergence of Time in Quantum Gravity [PDF]
, 1999 We discuss from a philosophical perspective the way in which the normal concept of time might be said to `emerge' in a quantum theory of gravity. After an introduction, we briefly discuss the notion of emergence, without regard to time (Section 2).
Butterfield, Jeremy, Isham, Chris
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Description of the rate‐limiting hydrogen tunneling mechanism for plant 9‐ and 13‐lipoxygenases
Protein Science, Volume 35, Issue 7, July 2026.Abstract Soybean lipoxygenase (GmLOX1), a plant 13‐LOX, has long been considered a model protein for non‐trivial, quantum hydrogen tunneling in enzyme catalysis. Hydrogen tunneling mechanisms have also been confirmed for LOXs across mammalian, fungal, and bacterial kingdoms.
Alex Kockler +7 more
wiley +1 more source
A First Class Constraint Generates Not a Gauge Transformation, But a Bad Physical Change: The Case of Electromagnetism [PDF]
, 2013 In Dirac-Bergmann constrained dynamics, a first-class constraint typically does not _alone_ generate a gauge transformation. By direct calculation it is found that each first-class constraint in Maxwell's theory generates a change in the electric field ...
Pitts, J. Brian, J. Brian Pitts
core +1 more source
4D spherically symmetric time-dependent quantum gravity amplitudes
European Physical Journal C: Particles and FieldsIn these short notes, we compute non-perturbatively the time-dependent quantum gravity amplitudes for a four-dimensional spherically symmetric space-time with space-like and time-like boundaries.
J. A. Rosabal
doaj +1 more source
Holographic signatures of resolved cosmological singularities
Journal of High Energy Physics, 2019 The classical gravity approximation is often employed in AdS/CFT to study the dual field theory, as it allows for many computations. A drawback is however the generic presence of singularities in classical gravity, which limits the applicability of AdS ...
N. Bodendorfer +2 more
doaj +1 more source