Results 101 to 110 of about 9,799,487 (341)

A rapid cosmic-ray increase in BC 3372-3371 from ancient buried tree rings in China [PDF]

, 2017
Cosmic rays interact with the Earth's atmosphere to produce $^{14}$C, which can be absorbed by trees. Therefore, rapid increases of $^{14}$C in tree rings can be used to probe previous cosmic-ray events.
Cheng, K. S., Dai, Z. G., Wang, F. Y., Yu, H., Zou, Y. C.   +4 more
core   +3 more sources

Mechanisms of parasite‐mediated disruption of brain vessels

FEBS Letters, EarlyView.
Parasites can affect the blood vessels of the brain, often causing serious neurological problems. This review explains how different parasites interact with and disrupt these vessels, what this means for brain health, and why these processes matter. Understanding these mechanisms may help us develop better ways to prevent or treat brain infections in ...
Leonor Loira, Sílvia Arroz‐Madeira, Cláudio A. Franco, Sara Silva Pereira   +3 more
wiley   +1 more source

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

Ultraviolet Spectroscopy of Circumnuclear Star Clusters in M83

, 2010
We analyze archival HST/STIS/FUV-MAMA imaging and spectroscopy of 13 compact star clusters within the circumnuclear starburst region of M83, the closest such example.
Adelberger, Aida Wofford, Bonatto, Bosch, Bresolin, Brown, Buta, Calzetti, Calzetti, Chandar, Chandar, Chandar, Chandar, Chen, Claus Leitherer, Comerón, Conti, de Mello, de Vaucouleurs, Dopita, Díaz, Díaz, Elmegreen, Elmegreen, Feldmeier, Hao, Harris, Heckman, Hillier, Hunt, Jogee, Knapen, Leitherer, Leitherer, Leitherer, Maeder, Maoz, Meurer, Meynet, Miller, Miskey, Pauldrach, Pellerin, Pellerin, Pettini, Puls, Puxley, Regan, Rix, Rodrigues, Rupali Chandar, Sakamoto, Schaller, Schlegel, Schmidt-Kaler, Thatte, Thim, Tody, Tody, Tremonti, van de Ven, Vázquez, Vázquez, Wiklind   +63 more
core   +1 more source

The newfound relationship between extrachromosomal DNAs and excised signal circles

FEBS Letters, EarlyView.
Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley   +1 more source

New objects in old structures: The Iron Age hoard of the Palacio III megalithic funerary complex (Almadén de la Plata, Seville, Spain) [PDF]

, 2015
Cultural contact, exchange and interaction feature high in the list of challenging topics of current research on European Prehistory. Not far off is the issue of the changing role of monuments in the making and maintaining of key cultural devices such as
Forteza González, M, García Sanjuán, L, Hernández Arnedo, MJ, Hunt Ortiz, MA, Martinón-Torres, M, Murillo-Barroso, M, Wheatley, D   +6 more
core  

Age differences in the controls of ring doves' pecking

Physiology & Behavior, 1993
Three experiments investigated the endogenous and exogenous controls of ring dove pecking. Experiment 1 confirmed that deprivation modulates adult pecking although nondeprived subjects peak at high levels. Experiment 2 determined that the level of pecking in nondeprived birds is modulated by exogenous cues such as the salience of the seed. Experiment 3
K R, Iskrant, P D, Balsam
openaire   +2 more sources

Conserved structural motifs in PAS, LOV, and CRY proteins regulate circadian rhythms and are therapeutic targets

FEBS Letters, EarlyView.
Cryptochrome and PAS/LOV proteins play intricate roles in circadian clocks where they act as both sensors and mediators of protein–protein interactions. Their ubiquitous presence in signaling networks has positioned them as targets for small‐molecule therapeutics. This review provides a structural introduction to these protein families.
Eric D. Brinckman, Anna E. Lester, Brian D. Zoltowski   +2 more
wiley   +1 more source

Analysis of the 90º and 150º angles for increment counting in otoliths of estuarine catfish

Ocean and Coastal Research
Fish age can be estimated with the use of age rings in calcified structures, such as otoliths. However, it is important to select an appropriate axis for counting the number of increments and to confirm that the age rings are visible in the otolith and ...
Igor Souza de Morais, Juliana de Souza Azevedo   +1 more
doaj   +2 more sources

Synchronous Evolution of Galaxies in Groups: NGC 524 Group

, 2012
By means of panoramic spectroscopy at the SAO RAS BTA telescope, we investigated the properties of stellar populations in the central regions of five early-type galaxies -- the NGC 524 group members. The evolution of the central regions of galaxies looks
Ch. Sengupta, D. A. Forbes, D. Burstein, D. E. Osterbrock, D. J. Wilman, D. Makarov, D. Thomas, D.W. Just, G. Gilmore, G. Stasinska, G. Vaucouleurs de, G. Worthey, G. Worthey, J. Kormendy, J. L. Tonry, J. Osmond, J. Vennik, K. Bekki, L. A. Jones, M. J. Geller, O. K. Sil’chenko, O. K. Sil’chenko, O. K. Sil’chenko, O. K. Sil’chenko, O. K. Sil’chenko, O. K. Sil’chenko, O. K. Sil’chenko, O. K. Sil’chenko, O.K. Sil’chenko, S. Brough, S. C. Trager, S. C. Trager, S. Veilleux, V. L. Afanasiev, V. L. Afanasiev, V. L. Afanasiev   +35 more
core   +1 more source