Results 51 to 60 of about 502,946 (294)

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

Multi-Pursuer and One-Evader Evasion Differential Game with Integral Constraints for an Infinite System of Binary Differential Equations

Mathematics
In the Hilbert space l2, a differential evasion game involving multiple pursuers is considered. Integral constraints are imposed on player control functions.
Ruzakhon Kazimirova, Gafurjan Ibragimov, Bruno Antonio Pansera, Abdulla Ibragimov   +3 more
doaj   +1 more source

Testing the Master Constraint Programme for Loop Quantum Gravity I. General Framework

, 2004
Recently the Master Constraint Programme for Loop Quantum Gravity (LQG) was proposed as a classically equivalent way to impose the infinite number of Wheeler -- DeWitt constraint equations in terms of a single Master Equation. While the proposal has some
Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A Krishnan B, B Dittrich, Birman M S, Bojowald M, Dittrich B, Dittrich B, Dittrich B, Dittrich B, Dittrich B, Fleichhack C, Gel'fand I M, Giulini D, Giulini D, Giulini D, Giulini D, Haag R, Kempf A, Klauder J, Lewandowski J Okolow A Sahlmann H Thiemann T, Marolf D, Marolf D Ruffini R Keiser M, Marsden J E, Okolow A Lewandowski J, Reed M, Rovelli C, Rovelli C, Rudin W, Sahlmann H, Sahlmann H, Sahlmann H, Sahlmann H, Sahlmann H Thiemann T, Sahlmann H Thiemann T, Shvedov O Y, Shvedov O Y, Smolin L, T Thiemann, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T   +57 more
core   +1 more source

Decoherent histories analysis of the relativistic particle [PDF]

, 2001
The Klein-Gordon equation is a useful test arena for quantum cosmological models described by the Wheeler-DeWitt equation. We use the decoherent histories approach to quantum theory to obtain the probability that a free relativistic particle crosses a ...
A. Ashtekar, A. Auerbach, A. Higuchi, A. Jadcyk, A. S. Holevo, B. DeWitt, C. Isham, C. Isham, C. Isham, C. Piron, C. Rovelli, C. Rovelli, C. Rovelli, C. Rovelli, D. Giulini, D. Giulini, D. H. Kobe, D. Marolf, D. Marolf, D. Marolf, D. Marolf, D. Marolf, E. Gurjoy, F. Embacher, F. T. Smith, F. T. Smith, G. R. Allcock, G. R. Allcock, G. R. Allcock, H. Salecker, I. Bloch, J. B. Hartle, J. B. Hartle, J. B. Hartle, J. B. Hartle, J. B. Hartle, J. G. Muga, J. G. Muga, J. J. Halliwell, J. J. Halliwell, J. J. Halliwell, J. J. Halliwell, J. J. Halliwell, J. J. Halliwell, J. J. Halliwell, J. Thorwart, J. Whelan, L. Mandelstamm, N. Grot, N. Kumar, N. Landsmann, N. Yamada, N. Yamada, N. Yamada, N. Yamada, N. Yamada, Ph. Blanchard, R. B. Griffiths, R. B. Griffiths, R. B. Griffiths, R. J. Micanek, R. Omnès, R. Omnès, R. Omnès, R. Omnès, R. Omnès, R. Omnès, R. Omnès, T. D. Newton, Y. Aharanov   +69 more
core   +2 more sources

Mapping the evolution of mitochondrial complex I through structural variation

FEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin, Tingting Chen, James A. Letts   +2 more
wiley   +1 more source

Overturning cells in the Southern Ocean and subtropical gyres [PDF]

Ocean Science, 2007
The circulation of the subtropical gyres can be decomposed into a horizontal recirculation along contours of constant Bernoulli potential and an overturning circulation across these contours.
J. A. Polton, D. P. Marshall
doaj  

Lorentzian path integral for quantum tunneling and WKB approximation for wave-function

European Physical Journal C: Particles and Fields, 2022
Recently, the Lorentzian path integral formulation using the Picard–Lefschetz theory has attracted much attention in quantum cosmology. In this paper, we analyze the tunneling amplitude in quantum mechanics by using the Lorentzian Picard–Lefschetz ...
Hiroki Matsui
doaj   +1 more source

Quantum geometry from phase space reduction

, 2009
In this work we give an explicit isomorphism between the usual spin network basis and the direct quantization of the reduced phase space of tetrahedra. The main outcome is a formula that describes the space of SU(2) invariant states by an integral over ...
Florian Conrady, Guillemin V., Kapovich M., Laurent Freidel   +3 more
core   +1 more source

On a path integral with a topological constraint [PDF]

, 1988
We discuss a new method to evaluate a path integral with a topological constraint involving a point singularity in a plane. The path integration is performed explicitly in the universal covering space. Our method is an alternative to an earlier method of
Bhagwat, K.V., Khandekar, D.C., Wiegel, F.W.   +2 more
core   +3 more sources

Feynman integrals from positivity constraints

Journal of High Energy Physics, 2023
Abstract We explore inequality constraints as a new tool for numerically evaluating Feynman integrals. A convergent Feynman integral is non-negative if the integrand is non-negative in either loop momentum space or Feynman parameter space.
openaire   +4 more sources