Results 71 to 80 of about 24,968,366 (387)

Time after time – circadian clocks through the lens of oscillator theory

FEBS Letters, EarlyView.
Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo, Carolin Ector, Hanspeter Herzel   +2 more
wiley   +1 more source

Cryptic geological histories accessed through entombed and matrix geochronometers in dykes

Communications Earth & Environment
Deep geology of ancient continental crust can be difficult to access, with direct observation restricted to limited exposures. The age and composition of hidden geology can be gleaned from indirect isotopic modelling or via detrital minerals within ...
Christopher L. Kirkland, Maximilian Dröllner, Raphael Quentin de Gromard, Bruno V. Ribeiro, Hugo K. H. Olierook, Michael Hartnady, Milo Barham, Janne Liebmann, Hugh Smithies, Andreas Zametzer   +9 more
doaj   +1 more source

The Planetary Theory of Solar Activity Variability: A Review

Frontiers in Astronomy and Space Sciences, 2022
Commenting the 11-year sunspot cycle, Wolf (1859, MNRAS 19, 85–86) conjectured that “the variations of spot-frequency depend on the influences of Venus, Earth, Jupiter, and Saturn.” The high synchronization of our planetary system is already nicely ...
Nicola Scafetta, Antonio Bianchini
doaj   +1 more source

Dynamical Habitability of Planetary Systems [PDF]

Astrobiology, 2010
The problem of the stability of planetary systems, a question that concerns only multiplanetary systems that host at least two planets, is discussed. The problem of mean motion resonances is addressed prior to discussion of the dynamical structure of the more than 350 known planets.
Dvorak, Rudolf, Pilat-Lohinger, Elke, Bois, Eric, Schwarz, Richard, Funk, Barbara, Beichman, Charles, Danchi, William, Eiroa, Carlos, Fridlund, Malcolm, Henning, Thomas, Herbst, Tom, Kaltenegger, Lisa, Lammer, Helmut, Léger, Alain, Liseau, René, Lunine, Jonathan, Paresce, Francesco, Penny, Alan, Quirrenbach, Andreas, Röttgering, Huub, Selsis, Franck, Schneider, Jean, Stam, Daphne, Tinetti, Giovanna, White, Glenn J.   +24 more
openaire   +4 more sources

Formation, Orbital and Internal Evolutions of Young Planetary Systems [PDF]

, 2016
The growing body of observational data on extrasolar planets and protoplanetary disks has stimulated intense research on planet formation and evolution in the past few years.
C. Baruteau, X. Bai, C. Mordasini, P. Mollière   +3 more
semanticscholar   +1 more source

Unstable Planetary Systems Emerging Out Of Gas Disks

, 2010
The discovery of over 400 extrasolar planets allows us to statistically test our understanding of formation and dynamics of planetary systems via numerical simulations.
Adams, Bryden, Chatterjee, Chiang, Currie, Duncan, D’Angelo, D’Angelo, Edward W. Thommes, Ford, Frederic A. Rasio, Goldreich, Hillenbrand, Jurić, Kokubo, Lee, Lodders, Masset, Matsuyama, Menou, Murray, Nagasawa, Narita, Raymond, Shakura, Sicilia-Aguilar, Soko Matsumura, Sourav Chatterjee, Tanigawa, Thommes, Winn, Wittenmyer, Wright, Wright   +33 more
core   +1 more source

The (Glg)ABCs of cyanobacteria: modelling of glycogen synthesis and functional divergence of glycogen synthases in Synechocystis sp. PCC 6803

FEBS Letters, EarlyView.
We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee, Dimitrios Bekiari, Sofia Doello, Karl Forchhammer   +3 more
wiley   +1 more source

Liberating exomoons in white dwarf planetary systems [PDF]

, 2016
Previous studies indicate that more than a quarter of all white dwarf (WD) atmospheres are polluted by remnant planetary material, with some WDs being observed to accrete the mass of Pluto in 106 yr.
M. Payne, D. Veras, M. Holman, B. Gaensicke   +3 more
semanticscholar   +1 more source

Long-term stability of the HR 8799 planetary system without resonant lock [PDF]

, 2016
HR 8799 is a star accompanied by four massive planets on wide orbits. The observed planetary configuration has been shown to be unstable on a timescale much shorter than the estimated age of the system (~ 30 Myr) unless the planets are locked into mean ...
Church, Ross P., Davies, Melvyn B., Gotberg, Ylva, Johansen, Anders, Mustill, Alexander   +4 more
core   +2 more sources

Rethinking plastic waste: innovations in enzymatic breakdown of oil‐based polyesters and bioplastics

FEBS Open Bio, EarlyView.
Plastic pollution remains a critical environmental challenge, and current mechanical and chemical recycling methods are insufficient to achieve a fully circular economy. This review highlights recent breakthroughs in the enzymatic depolymerization of both oil‐derived polyesters and bioplastics, including high‐throughput protein engineering, de novo ...
Elena Rosini, Nicolò Antonelli, Gianluca Molla   +2 more
wiley   +1 more source