Results 111 to 120 of about 14,153 (259)
Trace fossils of microbial colonization on Mars: Criteria for search and for sample return [PDF]
The recent discovery of microbial trace-fossil formation in the frigid Ross Desert of Antarctica suggests that early primitive life on Mars may have left behind similar signatures. These trace fossils are apparent as chemical or physical changes in rock (
Friedmann, E. I.
core +1 more source
A bristle‐nosed Jurassic ray‐finned fish (Actinopterygii) bears true dermal odontodes on its snout
Journal of Anatomy, EarlyView.Teeth show extreme diversity, including tooth‐like dermal odontodes or “skin teeth” in many extant fishes. We describe the anatomy of enlarged tubercles on the snout of Redfieldius, an extinct early Jurassic fish. We found that the tubercles in Redfieldius are dermal odontodes that evolved independently from those of living species. Abstract Comparison
Jack Stack +2 more
wiley +1 more source
The MacBrain Resource Center (MBRC) rhesus macaque embryonic brain histology datasets
Journal of Anatomy, EarlyView.We introduce the MacBrain Resource Center (MBRC) Collections of rhesus macaque embryonic brain tissue. Here, we illustrate histo‐ and immunohistology from our dynamically growing Collection 6, which currently contains >10,000 zoomable and downloadable images from n = 14 male and female embryos from early to late in gestation.
Valeria Mendoza‐Silva +11 more
wiley +1 more source
Discordance between the Indirect Object and the Atonic Pronoun le, a Growing Phenomenon
Ikala: Revista de Lenguaje y Cultura, 2011 In this descriptive, comparative and explanatory research, the phenomenon of discordance is examined between the indirect object and the atonic pronoun that doubles it in the sentence, in a corpus taken from the digital version of El Colombiano ...
Stella Caicedo Villa
doaj
Fossilization in second language acquisition: some experimental data from the second language classroom [PDF]
, 2017 Higgs and Clifford (1982) claim that grammatical accuracy must be stressed before communicative modes of language instruction can be undertaken. Implicit in this article is that grammar must be taught deductively and that students taught second languages
Hammond, Robert M.
core +1 more source
Journal of Phycology, EarlyView.Abstract The genus Merismopedia is morphologically characterized by its distinctive colony arrangement yet exhibits considerable variability among species. Recent studies suggested that Merismopedia is polyphyletic, and its most likely true lineage was provisionally placed within the Microcystaceae. However, the available molecular data for most of the
Jan Pokorný +2 more
wiley +1 more source
University of Arkansas at Monticello\u27s 1985 Summer Science Institute: A Report and an Opinion [PDF]
, 1986 The University of Arkansas at Monticello\u27s 1985 Summer Science Institute was created to improve competence in science among on-the-job upper elementary school teachers (grades 4-6) in southeast Arkansas.
Sundell, Eric
core +2 more sources
Microspherules Formed by Lightning Strikes
Meteoritics &Planetary Science, EarlyView.Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
wiley +1 more source
Novel Glomeromycotina–moss associations identified in California dryland biocrusts
New Phytologist, EarlyView.Summary Drylands, which comprise c. 45% of Earth's land area, host biological soil crusts (biocrusts): symbiotic communities of cyanobacteria, fungi, algae, lichen, and bryophytes that stabilize soil and support key ecosystem functions. Moss‐dominated biocrusts are particularly interesting due to their potential to illuminate ancient bryophyte–fungal ...
Kian H. Kelly +3 more
wiley +1 more source
MINERALIZATION AND POTENTIAL FOR FOSSILIZATION OF AN EXTREMOTOLERANT BACTERIUM ISOLATED FROM A PAST MARS ANALOG ENVIRONMENT [PDF]
, 2016 Introduction: Several decades dedicated to the study of Mars has enabled scientists to understand that, during its history, environmental conditions on early Mars strongly contrasted with the present-day conditions, hostile for life.
Bohmeier, Maria +6 more
core