Results 31 to 40 of about 157,869 (299)

The Phylogeny of Rays and Skates (Chondrichthyes: Elasmobranchii) Based on Morphological Characters Revisited

Diversity, 2022
Elasmobranchii are relatively well-studied. However, numerous phylogenetic uncertainties about their relationships remain. Here, we revisit the phylogenetic evidence based on a detailed morphological re-evaluation of all the major extant batomorph clades
Eduardo Villalobos-Segura, Giuseppe Marramà, Giorgio Carnevale, Kerin M. Claeson, Charlie J. Underwood, Gavin J. P. Naylor, Jürgen Kriwet   +6 more
doaj   +1 more source

Investigating the cores of fossil systems with Chandra

, 2015
We investigate the cores of fossil galaxy groups and clusters (`fossil systems') using archival Chandra data for a sample of 17 fossil systems. We determined the cool-core fraction for fossils via three observable diagnostics, the central cooling time ...
Bharadwaj, V., Reiprich, T. H., Sanders, J. S., Schellenberger, G.   +3 more
core   +1 more source

Comment on “Bilaterian Burrows and Grazing Behavior at >585 Million Years Ago” [PDF]

, 2013
Pecoits et al. (Reports, 29 June 2012, p. 1693) describe bilaterian trace fossils and assign them an Ediacaran age based on the age of a granite interpreted as intrusive.
Beri, Angeles, Bettucci Sanchez, Leda, Bossi, Jorge, Gaucher, Claudio, Poire, Daniel Gustavo   +4 more
core   +2 more sources

Preserving Fossilized Soft Tissues: Advancing Proteomics and Unveiling the Evolutionary History of Cancer in Dinosaurs

Biology
Understanding how life-history strategies influence cancer susceptibility in dinosaurs requires a molecular-level analysis of preserved soft tissues. While previous research has largely focused on skeletal remains, the discovery of soft tissue structures
Pramodh Chitral Chandrasinghe, Biancastella Cereser, Sergio Bertazzo, Zoltán Csiki-Sava, Justin Stebbing   +4 more
doaj   +1 more source

Fossils upon Fossils [PDF]

Nature, 1967
Vertebrate Paleontology By Alfred Sherwood Romer. Third edition. Pp. viii + 468. (Chicago and London: University of Chicago Press, 1966.) $10; 72s.
openaire   +1 more source

The Mass Assembly of Fossil Groups of Galaxies in the Millennium Simulation

, 2007
The evolution of present-day fossil galaxy groups is studied in the Millennium Simulation. Using the corresponding Millennium gas simulation and semi-analytic galaxy catalogues, we select fossil groups at redshift zero according to the conventional ...
Dariush, Ali, Hartley, Will, Khosroshahi, Habib G., Pearce, Frazer, Ponman, Trevor J., Raychaudhury, Somak   +5 more
core   +1 more source

The First Quarterly Report Covering the Quarter Ending June 30, 1939 for the State-Wide Paleontologic-Mineralogic Survey [PDF]

, 1939
Bureau of Economic ...
Works Progress Administration
core   +1 more source

Ediacaran Macro Body Fossils [PDF]

, 2010
This paper, Ediacaran Macro Body Fossils, reports a new discovery of well preserved three dimensional macro body fossils of the Ediacaran Period in central YunNan province in the People's Republic of China.
ChuanWei Yang, Chun-Lan Huang, Jei-Fu Shaw, Liang Zheng, Timothy D. Huang, YiLung Chang   +5 more
core   +1 more source

Where are the Fossils of the First Galaxies? II. True Fossils, Ghost Halos, and the Missing Bright Satellites

, 2011
We use a new set of cold dark matter simulations of the local universe to investigate the distribution of fossils of primordial dwarf galaxies within, and around the Milky Way.
Abazajian, Barkana, Belokurov, Belokurov, Bovill, Bovill, Bozek, Brown, Brown, Brown, Bullock, Bullock, Ciardi, de Jong, Efstathiou, Frebel, Geha, Haiman, Irwin, Karachentsev, Karachentsev, Klypin, Knollmann, Koposov, Machacek, Maio, Martinez, Massimo Ricotti, McGaugh, McGaugh, Mia S. Bovill, Monelli, Moore, Naab, Norris, O’Shea, Peebles, Ricotti, Ricotti, Ricotti, Ricotti, Ricotti, Ricotti, Sand, Simon, Simon, Smith, Tinker, Tollerud, Trenti, Tully, Venkatesan, Walker, Walker, Walsh, Walsh, Whalen, Willman, Willman, Willman, Wise, Wise, Zentner, Zucker, Zucker   +64 more
core   +1 more source

Karl Popper and the Mechanisms of Hydrogen Embrittlement

Advanced Engineering Materials, EarlyView.
Representation of the beginning of loss of ductility rather than embrittlement. Small concentrations of hydrogen in a diffusible form within iron are well‐established to harm the mechanical integrity of steels. There are theories that attempt to explain the pernicious role of hydrogen.
H. K. D. H. Bhadeshia
wiley   +1 more source